摘要
为了满足弹载引信探测系统的高速、高精度、复杂算法的实时信号处理要求,设计了一种基于现场可编程门阵列(Field Programmable Gate Array,FPGA)的差频回波信号处理系统。针对传统的峰值检索目标检测算法在实际应用中误爆概率高的不足,根据CA-CFAR(单元平均恒虚警)检测理论以及LFMCW引信回波频谱特性,设计了频域CFAR(Constant False Alarm Rate)目标检测算法。在Matlab环境中对差频回波信号处理算法进行仿真,主要包括FIR、FFT、MTI、CFAR等。以Xilinx Virtex-5系列芯片XC5VLX50T和AD9230为核心,调用相关IP核,并结合Verilog HDL硬件电路设计语言,实现回波信号处理算法的硬件结构。仿真及实测结果表明:FIR、FFT、MTI、CFAR、目标判别等模块性能均能满足设计要求,该信号处理系统能够满足实时性要求,实现2.5m至3.5m范围内高精度稳定起爆。
In order to meet the high-speed,high-precision,and complex algorithm real-time signal processing requirements of the missile-borne fuze detection system,an intermediate frequency echo signal processing system based on Field Programmable Gate Array(FPGA)is designed.Aiming at the high false explosion probability of traditional peak retrieval target detection algorithms in practical applications,based on the CA-CFAR(Unit Average Constant False Alarm)detection theory and the LFMCW fuze echo spectrum characteristics,the target detection algorithm of the frequency domain CFAR(Constant False Alarm Rate)is designed.In the Matlab environment,the IF echo signal processing algorithm is simulated,including FIR,FFT,MTI,CFAR,etc.Take Xilinx Virtex-5 series chips XC5 VLX50 T and AD9230 as the core,call related IP core,and combine with Verilog HDL hardware circuit design language to realize the hardware structure of echo signal processing algorithm.Simulation and actual measurement results show that the performance of FIR,FFT,MTI,CFAR,target discrimination and other modules can meet the design requirements.The signal processing system can meet the real-time requirements and achieve high-precision and stable initiation of targets within the range of 2.5 m~3.5 m.
作者
曾世杰
刘景萍
马静
ZENG Shi-jie;LIU Jing-ping;MA Jing(Department of Detection and Control Engineering,Electro-Optical Institute,Nanjing University of Science and Technology,Nanjing 210094,China)
出处
《微波学报》
CSCD
北大核心
2021年第S01期154-157,共4页
Journal of Microwaves
