基于FPGA的低截获概率卫星测控信号捕获系统  

FPGA-based acquisition system of a satellite LPI TT&C signal

作　　者：陈啸[1] 李广侠[1] 李志强[1] 朱文明[1] 

机构地区：[1]解放军理工大学通信工程学院,江苏南京210007

出　　处：《微型机与应用》2016年第9期30-33,共4页Microcomputer & Its Applications

基　　金：国家自然科学基金(61571464)

摘　　要：提出了一种基于FPGA的低截获概率卫星测控信号捕获解决方案。基于AD+FPGA的硬件架构完成了带宽为200MHz的跳频和直接序列扩频混合扩频信号的解跳、解扩,实现了基于Xilinx的快速傅里叶变换IP核的扩频码的快速滑动码相关,以及多跳积分结果的相干累加,并采用相对门限法进行了捕获判决。板上试验结果证明了该方案的捕获性能,最大捕获时间小于4 s,捕获概率达到99%,虚警概率小于0.001。该系统已应用于北斗二代导航MEO卫星测控链路。An FPGA based acquisition solution for low-probability-of-interception signal is proposed. With AD ＋ FPGA architecture,the demodulation of a 200 MHz-wide frequency hopping and direct sequence（ FHDS） spread spectrum signal is achieved,the fast correlation of PN code based on the FFT IP core of Xilinx Corp. is achieved and the accumulation of the integral in multiple hops is implemented. A relative threshold method is applied in signal acquisition. The test-board experiment results validate the acquisition performance of this solution. The maximum acquisition time is less than 4 s,the probability of detection is over 99% and the false alarm probability is less than 0. 001. This design has been applied to the TT＆C sub-system of MEO satellites in Beidou navigation constellation.

关 键 词：FPGA 低截获概率信号 卫星测控 信号捕获 

分 类 号：TN927[电子电信—通信与信息系统]