ADS—B系统接收处理的关键算法研究与实现

在高A／C应答fruit交迭的环境下，可能使ADS—B信号被ADS—B系统接收后。产生一些错误位，从而必须对ADS—B信号进行检错与纠错处理。首先介绍了基于模式S的ADS-B系统的组成原理，给出了置信度判定的基本思想，阐述了循环冗余编码（CRC）校验的基本理论与纠错技术的基本原理；然后在此基础上，提出了一种基于ADS—B系统的纠检错算法，并给出了纠检错算法的信号处理流程图与FPGA逻辑设计方案；最后采用VerilogHDL语言完成了所有功能模块的设计。并联合ISE与ModlSim两个软件进行了仿真验证实验。实验结果表明，该算法能够有效地对ADS。B信号进行检错与纠错。

Research and Implementation of Key Receiving Processing Algorithms for ADS-B System

Under the condition of high A/C response fruit overlap, some automatic dependent surveillance-broad- cast （ADS-B） signals received by ADS-B system may be in error, therefore error detection and correction is needed. Firstly, composition and principle of ADS-B system based on Mode S is introduced, degree of confidence determination concept is given, basic theory of cyclic redundancy code （CRC） and the basic principle of error correction technology is described. Then an error-detection and correction algorithm based on ADS-B system is proposed, and flow chart of signal processing and a FPGA logic design of the presented algorithm are given. Finally, design of all functional modules is completed using Verilog HDL language, and simulation verification experiments are carried out by incorporating of ISE and ModlSim software. Experimental results show that the algorithm can detect and correct ADS-B signals effectively.