The RTCA (Radio Technical Commission for Aeronautics) DO-260B document has stimulated in latest years the adoption of novel algorithms to improve the ability of receivers to detect and decode ADS-B (Automatic Dependent Surveillance-Broadcast) signals, with particular emphasis on preamble detection, declaration of bit state and confidence level, detection and correction of errors. Motivated by an industry-driven research project, this paper reports on performance analysis of a set of enhanced techniques that we have implemented for detection and decoding of ADS-B signals transmitted at 1090 MHz carrier frequency also in high interference conditions. An extensive set of results has been derived through a specifically developed simulation environment, able to closely model a wide range of operational scenarios by generating ADS-B frames and Mode A/C interfering signals. The simulation environment also includes an implementation of two RF (Radio Frequency) receiver chains that refer to a linear amplifier and a logarithmic amplifier, respectively. The investigations are mainly focused on evaluating the impact of the interference generated by Mode A/C replies on preamble detection and data decoding for ADS-B signals. In this regard, the ability of enhanced reception techniques to improve detection performance is assessed. Numerical results obtained from extensive simulation runs are reported and commented. They actually demonstrate that enhanced techniques are essential to guarantee adequate detection performance in the harsh environments envisaged by increased intensity of air traffic and the extensive use of ADS-B for traffic control.

近年来，RTCA（航空无线电技术委员会）DO-260B文件刺激了新型算法的采用，以提高接收器检测和解码ADS-B（自动相关监视-广播）信号的能力，尤其着重于前言检测，位状态和置信度声明，错误检测和纠正。受行业驱动的研究项目的激励，本文报告了一组增强技术的性能分析，我们已经实施了这些技术，用于检测和解码在高干扰条件下也以1090 MHz载波频率传输的ADS-B信号。通过专门开发的仿真环境可以得出大量结果，能够通过生成ADS-B帧和模式A / C干扰信号来紧密模拟各种操作场景。该模拟环境还包括两个RF（射频）接收器链的实现，这两个接收器链分别是指线性放大器和对数放大器。研究主要集中在评估模式A / C答复所产生的干扰对ADS-B信号的前同步码检测和数据解码的影响。在这方面，评估了增强的接收技术改善检测性能的能力。报告和评论了从大量模拟运行中获得的数值结果。