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Terrain‐referenced navigation using a steerable‐laser measurement sensor NAVIGATION (IF 1.7) Pub Date : 2021-01-15 Jason D. Carroll; Aaron J. Canciani
The benefits of GNSS have created dependencies on navigation in modern day aviation systems. Many of these systems operate with no backup navigation source. This makes the capabilities supported by precise navigation vulnerable. This paper investigates a contemporary approach to terrain‐referenced navigation (TRN), used to preserve an aircraft's navigation solution during periods of GNSS denial. Traditionally
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ION GNSS software‐defined radio metadata standard NAVIGATION (IF 1.7) Pub Date : 2021-01-15 Sanjeev Gunawardena; Thomas Pany; James Curran
The past several years have seen a proliferation of software‐defined radio (SDR) data collection systems and processing platforms designed for or applicable to satellite navigation (satnav) applications. These systems necessarily produce datasets in a wide range of different formats. To correctly interpret this SDR data, essential information such as the packed sample format and sampling rate is needed
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GNSS degradation model in presence of continuous wave and pulsed interference NAVIGATION (IF 1.7) Pub Date : 2021-01-12 Axel Garcia‐Pena; Olivier Julien; Cristophe Macabiau; Mikael Mabilleau; Pierre Durel
In the Global Navigation Satellite System (GNSS) L5/E5a interference environment, RTCA DO‐292 proposes a model to compute the degradation due to the presence of interference signals, such as Distance Measuring Equipment/TACtical Air Navigation (DME/TACAN), Joint Tactical Information Distribution System/Multifunctional Information Distribution System (JTIDS/MIDS), etc., and due to the application of
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Using dual‐polarization GPS antenna with optimized adaptive neuro‐fuzzy inference system to improve single point positioning accuracy in urban canyons NAVIGATION (IF 1.7) Pub Date : 2021-01-12 Rui Sun; Linxia Fu; Guanyu Wang; Qi Cheng; Li‐Ta Hsu; Washington Yotto Ochieng
This paper builds on the machine learning research to propose two new algorithms based on optimizing the Adaptive Neuro Fuzzy Inference System (ANFIS) with a dual‐polarization antenna to predict pseudorange errors by considering multiple variables including the right‐hand circular polarized (RHCP) signal strength, signal strength difference between the left‐hand circular polarized (LHCP) and RHCP outputs
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A long‐term broadcast ephemeris model for extended operation of GNSS satellites NAVIGATION (IF 1.7) Pub Date : 2020-12-28 Oliver Montenbruck; Peter Steigenberger; Moritz Aicher
GNSS positioning relies on orbit and clock information, which is predicted on the ground and transmitted by the individual satellites as part of their broadcast navigation message. For an increased autonomy of either the space or user segment, the capability to predict a GNSS satellite orbit over extended periods of up to two weeks is studied. A tailored force model for numerical orbit propagation
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Multi‐slices navigation approach for unknown 3D environments using micro aerial vehicles NAVIGATION (IF 1.7) Pub Date : 2020-12-23 H. A. Mohamed; A. M. Moussa; N. El‐Sheimy; M. M. Elhabiby
Due to the small size of Micro Aerial Vehicles, they are well suited for various indoor applications, especially search/rescue operations. Most of these operations are performed in unknown 3D environments. Real‐time map construction and vehicle's localization are essential tasks. Various approaches provide solutions for 3D‐map representation. However, these approaches require expensive embedded systems
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Design of a parallelized direct position estimation‐based GNSS receiver NAVIGATION (IF 1.7) Pub Date : 2020-12-19 Matthew Peretic; Grace X. Gao
Theoretical results conclude that Direct Position Estimation (DPE)‐based Global Navigation Satellite System (GNSS) receivers can achieve more robust localization than their conventional two‐step counterparts. However, compared to conventional approaches, there is a much smaller body of work for DPE, and DPE receiver implementations are highly experimental. This work surveys DPE techniques from the
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Effect of GPS III weighted voting on P(Y) receiver processing performance NAVIGATION (IF 1.7) Pub Date : 2020-10-21 David William Allen; Alberto Arredondo; Daniel R. Barnes; John W. Betz; Alessandro P. Cerruti; Benjamin Davidson; Karl L. Kovach; Alexander Utter
Signal generation in the GPS III satellites employs weighted voting to combine the baseband P(Y) signal with both components of the baseband L1C signal on the in‐phase part of the L1 carrier. Weighted voting employs majority voting with pseudorandom time multiplexing of pure signals, producing a constant‐envelope real‐valued combination of the three biphase inputs with different useful received powers
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Performance comparison of time‐of‐arrival estimation techniques for LTE signals in realistic multipath propagation channels NAVIGATION (IF 1.7) Pub Date : 2020-11-06 Pai Wang; Y. Jade Morton
Long term evolution (LTE) signals have the potential for use in positioning, especially in challenging environments. The time‐of‐arrival (TOA)‐based technique supported by LTE is attractive due to its high positioning accuracy. However, it is vulnerable to multipath propagation effects in typical LTE channels. This paper will summarize several existing advanced TOA estimators for LTE signals, i.e.
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GNSS interferometric reflectometry signature‐based defense NAVIGATION (IF 1.7) Pub Date : 2020-10-02 Steven W. Lewis; C. Edward Chow; Felipe Geremia‐Nievinski; Dennis M. Akos; Sherman Lo
Global navigation satellite system (GNSS) signals are vulnerable to radio frequency interference (RFI) and spoofing. RFI detection has become trivial with many detection algorithms available and built into GNSS receivers; this is not the case with spoofing. GNSS spoofing can involve generating false GNSS signals with one or more altered components of GNSS satellite transmissions: radio frequency (RF)
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Improving the calibration process of inertial measurement unit for marine applications NAVIGATION (IF 1.7) Pub Date : 2020-11-04 Hossein Rahimi; Amir Ali Nikkhah
Marine navigation systems have very accurate sensors, such as 0.01deg/hr gyro drift stability and 0.1mg/year accelerometer bias stability. Common calibration methods and equipment do not meet the accuracy required. In this paper, a systematic method for calibration of an inertial measurement unit (IMU) for marine applications is proposed which is not based on the accuracy of the calibration turn table
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An efficient tuning framework for Kalman filter parameter optimization using design of experiments and genetic algorithms NAVIGATION (IF 1.7) Pub Date : 2020-10-22 Alan Zhang; Mohamed Maher Atia
The Extended Kalman Filter (EKF) is currently a dominant sensor fusion method for mobile devices, robotics, and autonomous vehicles. Its performance heavily depends on the selection of EKF parameters. Therefore, the optimal selection of parameters is a critical factor in EKF design and use. In this paper, a methodical and efficient method of EKF parameter tuning is presented. The tuning framework uses
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Sensitivity Analysis of Precision Inertial Sensor‐based Navigation System (SAPIENS) NAVIGATION (IF 1.7) Pub Date : 2020-10-31 Rachit Bhatia; David Geller
The future of deep space exploration depends upon technological advancement towards improving spacecraft's autonomy and versatility. This study aims to examine the feasibility of autonomous orbit determination using advanced accelerometer measurements. The objective of this research is to ascertain specific sensor requirements to meet pre‐defined mission navigation error budgets. Traditional inertial
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A collocation framework to retrieve tropospheric delays from a combination of GNSS and InSAR NAVIGATION (IF 1.7) Pub Date : 2020-11-04 Endrit Shehaj; Karina Wilgan; Othmar Frey; Alain Geiger
High spatio‐temporal variability of atmospheric water vapor affects microwave signals of Global Navigation Satellite Systems (GNSS) and Interferometric Synthetic Aperture Radar (InSAR). A better knowledge of the distribution of water vapor improves both GNSS‐ and InSAR‐derived data products. In this work, we present a collocation framework to combine and retrieve zenith and (relative) slant tropospheric
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GNSS signal phase, TEC, and phase unwrapping errors NAVIGATION (IF 1.7) Pub Date : 2020-10-10 Charles Rino; Brian Breitsch; Yu Morton; Dongyang Xu; Charles Carrano
Precise measurements of signal phase are essential for Global Navigation Satellite System (GNSS) position estimates. However, propagation through the earth's ionosphere imposes frequency‐dependent phase errors. The frequency dependence is exploited to correct phase errors proportional to total electron content (TEC) divided by frequency. Scintillation causes additional stochastic errors, which can
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Design and implementation of a BDS precise point positioning service NAVIGATION (IF 1.7) Pub Date : 2020-10-09 Cheng Liu; Weiguang Gao; Tianxiong Liu; Dun Wang; Zheng Yao; Yang Gao; Xin Nie; Wei Wang; Dongjun Li; Weixing Zhang; Dongxia Wang; Yongnan Rao
Precise point positioning (PPP) service is of great significance for BDS. The design and implementation of the service are presented. The PPP‐B2b signal of the service is constructed, which is efficient multiplexed with other signal components, and achieves compatibility between two service phases. A customized message format that can augment all visible satellites of four core constellations in mainland
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GNSS interference mitigation: A measurement and position domain assessment NAVIGATION (IF 1.7) Pub Date : 2020-10-02 Daniele Borio; Ciro Gioia
Modern Global Navigation Satellite System (GNSS) receivers have to withstand significant levels of interference in order to operate under harsh conditions, such as in the presence of jamming and of other Radio Frequency (RF) threats. A possibility is to implement pre‐correlation interference mitigation techniques that operate directly on the samples provided by the receiver front‐end. This paper provides
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Novel partial correlation method algorithm for acquisition of GNSS tiered signals NAVIGATION (IF 1.7) Pub Date : 2020-09-16 Jiří Svatoň; František Vejražka; Pavel Kubalík; Jan Schmidt; Jaroslav Borecký
This paper presents a new modified Single Block Zero‐Padding (mSBZP) Partial Correlation Method (PCM) Parallel Code Search (PCS) algorithm for effective acquisition of weak GNSS tiered signal using coherent processing of its secondary code (SC) component. Two problems are discussed: acquisition of primary codes with a longer period using FFT blocks of limited length, and the utilization of PCS in the
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HEAD: smootH Estimation of wAlking Direction with a handheld device embedding inertial, GNSS, and magnetometer sensors NAVIGATION (IF 1.7) Pub Date : 2020-09-12 Johan Perul; Valerie Renaudin
Pedestrian navigation with handheld sensors is still particularly complex. Pedestrian Dead Reckoning method is generally used, but the estimation of the walking direction remains problematic because the device's pointing direction does not always correspond to the walking direction. To overcome this difficulty, it is possible to use gait modeling based approaches. But, these methods suffer from sporadic
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Modular framework for implementation and analysis of recursive filters with considered and neglected parameters NAVIGATION (IF 1.7) Pub Date : 2020-09-12 Kyle J. DeMars; Kari C. Ward
This paper develops novel covariance and square‐root factor formulations of a consider‐neglect Kalman filter for navigation applications. The proposed filter partitions system parameters into three distinct categories: those to be estimated by the filter, those whose contribution to the system are considered without being explicitly estimated, and those with sufficiently low effect on the system such
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Residual‐based multi‐filter methodology for all‐source fault detection, exclusion, and performance monitoring NAVIGATION (IF 1.7) Pub Date : 2020-08-25 Juan Jurado, John Raquet, Christine M. Schubert Kabban, Jonathon Gipson
All‐source navigation has become increasingly relevant over the past decade with the development of viable alternative sensor technologies. However, as the number and type of sensors informing a system increases, so does the probability of corrupting the system with sensor modeling errors, signal interference, and undetected faults. Though the latter of these has been extensively researched, the majority
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Automatic detection of ionospheric scintillation‐like GNSS satellite oscillator anomaly using a machine‐learning algorithm NAVIGATION (IF 1.7) Pub Date : 2020-08-24 Yunxiang Liu, Y. Jade Morton
In this paper, we propose a machine‐learning‐based approach to automatically detect a satellite oscillator anomaly. A major challenge is to differentiate an oscillator anomaly from ionospheric scintillation. Although both scintillation and oscillator anomalies cause phase disturbances, their underlying physics are different and, therefore, show different carrier‐frequency dependency. By using triple‐frequency
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Integrity monitoring of Graph‐SLAM using GPS and fish‐eye camera NAVIGATION (IF 1.7) Pub Date : 2020-08-24 Sriramya Bhamidipati, Grace Xingxin Gao
We propose a Simultaneous Localization and Mapping (SLAM)‐based Integrity Monitoring (IM) algorithm using GPS and fish‐eye camera to compute the protection levels while accounting for multiple faults in GPS and vision. We perform graph optimization using GPS pseudoranges, pixel intensities, vehicle dynamics, and satellite ephemeris to simultaneously localize the vehicle, GPS satellites, and key image
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Mesh topology based clock synchronization technique for pseudolite systems NAVIGATION (IF 1.7) Pub Date : 2020-08-20 Tengfei Wang, Zheng Yao, Mingquan Lu
Clock synchronization is critical for synchronous pseudolite systems. Wireless synchronization methods are desirable for their flexibility in system deployment, and most of them build a tree topology of time information flow based on master‐slave synchronization between pseudolites. A slave pseudolite can receive signals broadcast by multiple pseudolites; however, existing methods usually utilize one
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Optimizing the co‐design of message structure and channel coding to reduce the TTD for a Galileo 2nd generation signal NAVIGATION (IF 1.7) Pub Date : 2020-08-13 Lorenzo Ortega, Charly Poulliat, Marie Laure Boucheret, Marion Aubault‐Roudier, Hanaa Al‐Bitar
Recently, the joint design of the GNSS message structure and the associated channel‐coding scheme have been investigated as a means to reduce the Time‐To‐First‐Fix (TTFF) and particularly the time to retrieve the Clock and Ephemerides Data (CED). In this context, a new method to co‐design the navigation message and the channel‐coding scheme structure is proposed in this paper. This new co‐design enables
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A novel in‐motion alignment method for underwater SINS using a state‐dependent Lie group filter NAVIGATION (IF 1.7) Pub Date : 2020-08-12 Fujun Pei, Hao Xu, Ning Jiang, Desen Zhu
The in‐motion alignment for the underwater strapdown inertial navigation system is still a challenging problem due to various disturbances in the underwater environment. In this paper, a novel in‐motion alignment method, based on the Lie group representation, is developed. In this method, the process model is rewritten using the Lie group of the constant attitude matrix between two inertial frames
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Survey on signal processing for GNSS under ionospheric scintillation: Detection, monitoring, and mitigation NAVIGATION (IF 1.7) Pub Date : 2020-08-06 Jordi Vilà‐Valls, Nicola Linty, Pau Closas, Fabio Dovis, James T. Curran
Ionospheric scintillation is the physical phenomena affecting radio waves coming from the space through the ionosphere. Such disturbance is caused by ionospheric electron‐density irregularities and is a major threat in Global Navigation Satellite Systems (GNSS). From a signal‐processing perspective, scintillation is one of the most challenging propagation scenarios, particularly affecting high‐precision
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Flight test of a pseudo‐ranging signal compatible with existing distance measuring equipment (DME) ground stations NAVIGATION (IF 1.7) Pub Date : 2020-07-29 Sherman Lo, Yu‐Hsuan Chen, Per Enge, Wouter Pelgrum, Kuangmin Li, George Weida, Achim Soelter
Distance measuring equipment (DME) has been a cornerstone of aviation navigation for the last 70 years. While GNSS is taking an increasingly important role in civil aviation, DME can still play an important role in a robust aviation infrastructure in the foreseeable future. Advanced concepts have been developed to improve DME performance and capabilities. One concept is a DME‐based pseudolite that
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Kalman filtering with noncoherent integrations for Galileo E6‐B tracking NAVIGATION (IF 1.7) Pub Date : 2020-07-25 Melania Susi, Daniele Borio
The former Galileo Commercial Service (CS) will provide a High Accuracy Service (HAS) and a Commercial Authentication Service (CAS). The first will disseminate free Precise Point Positioning (PPP) corrections through the E6‐B signal whereas the second will provide authentication capabilities through the E6‐C pilot component that will be encrypted. For this reason, improved processing strategies for
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High‐precision unambiguous tracking technique for BDS B1 wideband composite signal NAVIGATION (IF 1.7) Pub Date : 2020-07-17 Yang Gao, Zheng Yao, Mingquan Lu
In the BeiDou Navigation Satellite System (BDS) B1 band, a single‐sideband complex binary offset carrier (SCBOC) modulation is employed to combine the legacy and the modernized B1 signals into an asymmetric‐wideband composite signal for the backward compatibility. However, SCBOC modulation has only been regarded as a means to achieve the co‐existance between B1I and B1C signals, whose high‐precision
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Improved urban navigation with shadow matching and specular matching NAVIGATION (IF 1.7) Pub Date : 2020-07-14 Kirsten L. Strandjord, Penina Axelrad, Shan Mohiuddin
As the dependence of Global Navigation Systems (GNSS) increases, so does a growing demand for GNSS accuracy in urban environments. This research aims to improve navigation in these environments by integrating non‐line‐of‐sight signals, building models, and measured signal to noise ratios in ways not typically used in GNSS positioning. We propose a technique of combining elements of shadow matching
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Characterization and mitigation of interference between GNSS radio occultation and reflectometry signals for low‐altitude occultations NAVIGATION (IF 1.7) Pub Date : 2020-06-27 Ian Collett, Y. T. Jade Morton, Yang Wang, Brian Breitsch
This research investigates the mutual interference between a GNSS signal refracted through the atmosphere and the same signal reflected from the surface below. For low‐altitude occultations, the reflected signal can be present as multipath when tracking the direct signal. This poses a problem when making remote sensing measurements using GNSS‐RO or GNSS‐R techniques. Here, this issue is addressed in
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Issue Information NAVIGATION (IF 1.7) Pub Date : 2020-06-23
No abstract is available for this article.
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Autonomous clock ensemble algorithm for GNSS applications NAVIGATION (IF 1.7) Pub Date : 2020-06-23 Michael J. Coleman, Ronald L. Beard
The US Naval Research Laboratory (NRL) has developed clock ensembles for a number of vital GNSS projects and services throughout the US and international community. Some efforts include algorithms for local realization of Coordinated Universal Time; participation in the upgrade of the Global Positioning System (GPS) system time; the initial implementation of a coherent geophysical reference time known
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Issue Information NAVIGATION (IF 1.7) Pub Date : 2020-06-23
No abstract is available for this article.
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Characterization of on‐orbit GPS transmit antenna patterns for space users NAVIGATION (IF 1.7) Pub Date : 2020-06-16 Jennifer E. Donaldson, Joel J.K. Parker, Michael C. Moreau, Dolan E. Highsmith, Philip D. Martzen
The GPS Antenna Characterization Experiment (GPS ACE) has made extensive observations of GPS L1 signals received at geosynchronous (GEO) altitude, with the objective of developing comprehensive models of the signal levels and signal performance in the GPS transmit antenna side lobes. The GPS ACE architecture has been in place collecting observations with extreme sensitivity for several years, enabling
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Resilient multipath prediction and detection architecture for low‐cost navigation in challenging urban areas NAVIGATION (IF 1.7) Pub Date : 2020-06-11 Ivan Smolyakov, Mohammad Rezaee, Richard B. Langley
A twofold architecture based on GNSS multipath environment prediction and detection is presented in a context of loosely coupled and tightly coupled IMU/GNSS integration for navigation in urban areas. A signal quality monitoring group of techniques is applied for a platform self‐contained effort to detect and exclude multipath‐contaminated GNSS signals. Additionally, the sensor integration Kalman filter
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Relative navigation of fixed‐wing aircraft in GPS‐denied environments NAVIGATION (IF 1.7) Pub Date : 2020-06-10 Gary Ellingson, Kevin Brink, Tim McLain
This work enables GPS‐denied flight on fixed‐wing UAS by accounting for fixed‐wing‐specific sensing requirements and using a methodology called relative navigation as an overarching framework. The development of an odometry‐like, front‐end, EKF‐based estimator that utilizes only a monocular camera and an inertial measurement unit (IMU) is presented. The filter uses the measurement model of the multi‐state‐constraint
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Analysis of phase bias between GNSS signal components caused by nonideal group delay NAVIGATION (IF 1.7) Pub Date : 2020-06-09 Yuqi Liu, Yi Yang, Lin Chen, Hongchen Pan, Yihang Ran
Binary offset carrier (BOC) modulations are widely used in the modernized satellite navigation systems. But we find an interesting phenomenon that the signal composed of different BOC modulations suffers larger phase bias than the case that all the components have the same modulation due to the nonideal group delay of the channel. This issue is more obvious in navigation satellites for the use of a
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A simple model for GPS C/A‐code self‐interference NAVIGATION (IF 1.7) Pub Date : 2020-06-07 Christopher J. Hegarty
The GPS C/A‐code is the most widely utilized GNSS signal today. The C/A‐code design includes (1) a short (length‐1023) spreading code that repeats every 1 ms and (2) a low (50 bps) data rate. These two characteristics can lead to undesired interactions between received C/A‐code signals within user equipment. In this paper, a simple model is derived for predicting the impact of C/A‐code self‐interference
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Extracting unmodeled systematic errors from BDS orbit determination residuals and application in SPP/PPP NAVIGATION (IF 1.7) Pub Date : 2020-06-05 Guangbao Hu, Shirong Ye, Dezhong Chen, Lewen Zhao, FengYu Xia, Xiaolei Dai, Peng Jiang
To analyze the unmodeled systematic errors in BDS, a filter‐assisted Partly Ensemble Empirical Mode Decomposition (PEEMD) method is combined with Hilbert spectrum analysis to extract the feature information from BDS preprocessed orbit determination residuals (PODR). The results show that the feature extraction method can effectively extract a period of about 1 day for GEO/IGSO satellites and a period
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Signal deformation fault monitors for dual‐frequency GBAS NAVIGATION (IF 1.7) Pub Date : 2020-06-04 Junesol Song, Carl Milner, Ikhlas Selmi
This paper proposes a new dual‐frequency signal deformation fault monitor, which can effectively reduce the time delay at the Ground‐Based Augmentation System (GBAS) airborne user from the airborne filter initialization to the time when it incorporates ground corrections and user measurements for navigation, assuring the system integrity at the same time. The new monitor is applied together with the
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Assessment of errors in NavIC observables for stationary receivers NAVIGATION (IF 1.7) Pub Date : 2020-05-12 Althaf Azeez, Hari Hablani
Our objective in this paper is to assess all errors in NavIC's pseudorange so that they can be mitigated or accounted for appropriately in the dynamics model to achieve high‐accuracy navigation. Multipath errors in the L5 and S1 pseudoranges are different; hence, oscillatory multipath is removed using sidereal repeatability for these frequencies separately for accurate iono delay estimation. Iono delay
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Generation of crustal movement correction parameter considering valid period and accuracy guarantee NAVIGATION (IF 1.7) Pub Date : 2020-04-04 Yuki Ichikawa, Mikihiro Hosoi
In recent years, due to the development of precise point positioning (PPP), the inconsistency of map and satellite positioning results due to crustal deformation has come to the surface. In order to solve this problem, a parameter for correcting the crustal deformation is necessary, and if it is provided as a service, the validity period and the accuracy guarantee are also necessary. In this research
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High‐parity vertical Reed‐Solomon codes for long GNSS high‐accuracy messages NAVIGATION (IF 1.7) Pub Date : 2020-03-26 Ignacio Fernández‐Hernández, Tommaso Senni, Daniele Borio, Giovanni Vecchione
This paper presents in detail an outer‐coding proposal for long GNSS messages disseminated by multiple satellites. The proposal minimizes the message reception time, or Time To Retrieve Data (TTRD), over a page erasure channel in most types of environments and visibility conditions. A message M consisting of k pages is encoded into a set C consisting of n pages, such that when any subset C′ of C of
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Issue Information NAVIGATION (IF 1.7) Pub Date : 2020-03-20
No abstract is available for this article.
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A new array concept using spatially distributed subarrays for unambiguous GNSS interference mitigation in automotive applications NAVIGATION (IF 1.7) Pub Date : 2020-03-20 Marius Brachvogel, Michael Niestroj, Soeren Zorn, Michael Meurer, Syed N. Hasnain, Ralf Stephan, Matthias A. Hein
Radio frequency interference (RFI) poses a severe problem for conventional GNSS receivers. Even low powered RFI can block the reception of satellite signals and prevent a position determination. Antenna array systems have been proven suitable to counteract RFI by incorporating spatial processing techniques. The large size of uniform rectangular arrays (URA) with half‐wave antenna spacing impedes an
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Galileo model of group delay accuracy for advanced RAIM users NAVIGATION (IF 1.7) Pub Date : 2020-03-20 Ilaria Martini, Matteo Sgammini, Juan Pablo Boyero
Group delays (GDs) are errors affecting Global Navigation Satellite Systems (GNSS) due to non‐idealities of the satellite or the receiver hardware and can compromise safety critical applications (eg, advanced receiver autonomous integrity monitoring [ARAIM]) when integrity requirements are at major or even hazardous safety level. The paper shows that GPS uses L1 and L2 signals in the generation of
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Issue Information NAVIGATION (IF 1.7) Pub Date : 2020-03-20
No abstract is available for this article.
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MagSLAM: Aerial simultaneous localization and mapping using Earth's magnetic anomaly field NAVIGATION (IF 1.7) Pub Date : 2020-03-04 Taylor N. Lee, Aaron J. Canciani
Instances of spoofing and jamming of global navigation satellite systems (GNSSs) have emphasized the need for alternative navigation methods. Aerial navigation by magnetic map matching has been demonstrated as a viable GNSS‐alternative navigation technique. Flight test demonstrations have achieved accuracies of tens of meters over hour‐long flights, but these flights required accurate magnetic maps
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GPS‐based satellite formation flight simulation and applications to ionospheric remote sensing NAVIGATION (IF 1.7) Pub Date : 2020-02-27 YuXiang Peng, Wayne A. Scales, Thom R. Edwards
The Virginia Tech Formation Flying Testbed (VTFFTB), a GNSS‐based hardware‐in‐the‐loop (HIL) simulation testbed for spacecraft formation flight, is developed and applied to ionospheric remote sensing. The current VTFFTB consists of GNSS RF hardware signal simulators, multi‐constellation multi‐frequency GNSS receivers, a navigation and control system, an STK visualization system, and an ionospheric
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Performance of dual‐channel codeless and semicodeless processing NAVIGATION (IF 1.7) Pub Date : 2020-02-27 John W. Betz, Alessandro P. Cerruti
While dual‐channel codeless and semicodeless processing are mature techniques used on the Global Positioning System P(Y) signals, the literature lacks assessment of their performance, with derivations from first principles. This paper fills that gap, providing mathematical models of three dual‐channel codeless or semicodeless processing approaches. Each exploits a situation where the same signal is
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A two‐parameter multifrequency GPS signal simulator for strong equatorial ionospheric scintillation: modeling and parameter characterization NAVIGATION (IF 1.7) Pub Date : 2020-02-20 Dongyang Xu, Y.T. Jade Morton, Charles L. Rino, Charles S. Carrano, Yu Jiao
This paper presents a physics‐based, multifrequency, strong scintillation simulator that requires only two input parameters: the S4 index and decorrelation time τ0. This simulator is developed based on the two‐component power‐law phase screen model, which is specified by five parameters and suitable for representation of strong equatorial scintillation. By setting three of the model parameters to representative
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Development of the dual‐frequency dual‐constellation airborne multipath models NAVIGATION (IF 1.7) Pub Date : 2020-02-16 Mihaela‐Simona Circiu, Stefano Caizzone, Michael Felux, Christoph Enneking, Markus Rippl, Michael Meurer
This paper presents a methodology to build multipath models for aviation use of new Global Positioning System (GPS) and Galileo signals. The estimation of airframe multipath errors makes use of carrier phase measurements; thus, it is affected by the integer ambiguities. A new method for removing the ambiguities from the multipath estimation is presented. The method is suitable for measurements from
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Impact of sample correlation on SISRE overbound for ARAIM NAVIGATION (IF 1.7) Pub Date : 2020-02-05 Santiago Perea, Michael Meurer, Boris Pervan
This paper analyzes the effect of error correlation on the SISRE bounding for GPS and Galileo satellites. For a given period of data collection, it computes the effective number of independent samples contained in a dataset applying an estimation variance analyses. Results show that the time between effective independent samples is highly dependent on the constellation and onboard clock type. On one
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Flight results of GPS‐based attitude determination for the Canadian CASSIOPE satellite NAVIGATION (IF 1.7) Pub Date : 2020-01-17 A. Hauschild, O. Montenbruck, R. B. Langley
The paper presents attitude determination results of the “GPS Attitude, Positioning and Profiling Experiment” (GAP) on board the CASSIOPE satellite using real flight data. The GAP payload consists of five minimally modified commercial‐off‐the‐shelf NovAtel OEM4‐G2L receivers that provide dual‐frequency GPS measurements and allow for attitude and orbit determination of the satellite as well as electron
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Issue Information NAVIGATION (IF 1.7) Pub Date : 2020-01-14
No abstract is available for this article.
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Angular accelerometer‐based inertial navigation system NAVIGATION (IF 1.7) Pub Date : 2020-01-14 Uriel Nusbaum, Ilan Rusnak, Itzik Klein
Angular acceleration sensors technologies are evolving and emerging in various applications. In this paper, we propose an angular accelerometer‐based inertial navigation system. One application of such systems can be highly maneuvering platforms where direct measurement of angular acceleration is desired. To that end, a review of modern angular acceleration sensor technologies and their possible applications
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Correcting NLOS by 3D LiDAR and building height to improve GNSS single point positioning NAVIGATION (IF 1.7) Pub Date : 2020-01-14 Weisong Wen, Guohao Zhang, Li‐Ta Hsu
We present a novel method to detect the GNSS NLOS and correct the NLOS pseudorange measurements based on on‐board sensing. This paper demonstrates the use of LiDAR scanner and a list of building heights to describe the perceived environment. To estimate the geometry and pose of the top edges of buildings (TEBs) relative to the GNSS receiver, a surface segmentation method is employed to detect the TEBs
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Distributed multi‐GNSS timing and localization for nanosatellites NAVIGATION (IF 1.7) Pub Date : 2020-01-14 Vincent Giralo, Simone D’Amico
Recent advances in distribution and miniaturization among spacecraft and expansion of global navigation satellite systems (GNSS) motivate the Distributed Multi‐GNSS Timing and Localization system. The DiGiTaL system is intended to provide nanosatellite swarms with unprecedented centimeter‐level relative navigation accuracy in real time and nanosecond‐level time synchronization through the integration
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