当前位置: X-MOL 学术GPS Solut. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
A fast method for the acquisition of weak long-code signal
GPS Solutions ( IF 4.9 ) Pub Date : 2020-08-10 , DOI: 10.1007/s10291-020-01018-6
Guanghao Nie , Xinlong Wang , Liangliang Shen , Yuanwen Cai

The growing demand for positioning, navigation and timing services is boosting the development of new signal systems that are gradually being adopted by Global Navigation Satellite System (GNSS), such as the BDS, the Galileo and the modernized GPS. A common feature of these new signal systems is that they have longer pseudorandom noise (PRN) code lengths than the old ones, which greatly improves the ranging accuracy and anti-interference ability of signals. However, the longer PRN code length leads to increased computational complexity and reduced acquisition speed, especially in low-carrier-to-noise-ratio (CNR) conditions. A rapid scheme for the acquisition of weak long-code signal is proposed. The reduced Doppler shift and code-phase space are pre-estimated with inertial navigation system (INS) aiding and ephemeris, and an FFT-based parallel time–frequency domain search method is used to realize rapid two-dimensional search. To further reduce the computational complexity of weak long-code signals, a parallel code-phase search (PCS) method with reduced code-phase space based on matrix partition and reconfiguration is proposed inside the correlator, which can realize the rapid coherent operation of signals. The proposed algorithm can greatly reduce the theoretical operands of FFT operation in the acquisition without loss to the relevant peak, to meet the requirements of receiver sensitivity and acquisition speed in the low-CNR conditions. Finally, computer simulations verify the effectiveness of this acquisition scheme.

中文翻译:

一种获取弱长码信号的快速方法

对定位,导航和计时服务的需求不断增长,正在推动新信号系统的发展,这些新信号系统已逐渐被全球导航卫星系统(GNSS)所采用,例如BDS,伽利略和现代化的GPS。这些新信号系统的一个共同特征是,它们比旧信号系统具有更长的伪随机噪声(PRN)码长度,从而大大提高了信号的测距精度和抗干扰能力。但是,较长的PRN码长度会导致计算复杂性增加,并且采集速度降低,尤其是在低载波噪声比(CNR)条件下。提出了一种获取弱长码信号的快速方案。减少的多普勒频移和码相空间是通过惯性导航系统(INS)辅助和星历来预先估算的,基于FFT的并行时频域搜索方法实现了快速的二维搜索。为了进一步降低弱长码信号的计算复杂度,在相关器内部提出了一种基于矩阵划分和重构的减少码相空间的并行码相搜索(PCS)方法,可以实现信号的快速相干运算。 。所提算法可以在不损失相关峰值的情况下,极大地减少采集中FFT运算的理论操作数,满足低CNR条件下接收机灵敏度和采集速度的要求。最后,计算机仿真验证了该采集方案的有效性。为了进一步降低弱长码信号的计算复杂度,在相关器内部提出了一种基于矩阵划分和重构的减少码相空间的并行码相搜索(PCS)方法,可以实现信号的快速相干运算。 。所提算法可以在不损失相关峰值的情况下,极大地减少采集中FFT运算的理论操作数,满足低CNR条件下接收机灵敏度和采集速度的要求。最后,计算机仿真验证了该采集方案的有效性。为了进一步降低弱长码信号的计算复杂度,在相关器内部提出了一种基于矩阵划分和重构的减少码相空间的并行码相搜索(PCS)方法,可以实现信号的快速相干运算。 。所提算法可以在不损失相关峰值的情况下,极大地减少采集中FFT运算的理论操作数,满足低CNR条件下接收机灵敏度和采集速度的要求。最后,计算机仿真验证了该采集方案的有效性。所提算法可以在不损失相关峰值的情况下,极大地减少采集中FFT运算的理论操作数,满足低CNR条件下接收机灵敏度和采集速度的要求。最后,计算机仿真验证了该采集方案的有效性。所提算法可以在不损失相关峰值的情况下,极大地减少采集中FFT运算的理论操作数,满足低CNR条件下接收机灵敏度和采集速度的要求。最后,计算机仿真验证了该采集方案的有效性。
更新日期:2020-08-10
down
wechat
bug