摘要
新体制雷达对抗技术的发展,对高宽带雷达信号的高速度、高灵敏度测频提出了日益迫切的需求。接收机是一种常用的雷达干扰机,其测频模块作为雷达对抗技术的一大核心模块,直接决定信号监测的覆盖带宽、信号处理的实时性以及灵敏度等方面。考虑到FPGA资源的稀缺性,设计旋转因子,得到改进的单比特测频算法,避免传统的离散傅里叶变换过于依赖大量乘法运算的不足。对0.2~2.2GHz的随机频率正弦信号进行测试,未过度引入误差,且大幅优化了时间和空间复杂度。在新型RFSoC平台下编写Verilog代码进行实际测试和仿真优化,对比了基16到256的单比特测频性能。实验结果显示:权衡响应速度及灵敏度,基64的单比特测频最适合2GHz带宽的雷达干扰技术需求,可以做到-50dBm的灵敏度、18.75MHz的最大频率精度误差;在低于100 ns的测频时间内,实现了对2.4 GHz的宽带信号的快速测频。
With the development of new radar countermeasure technology,there is an increasingly urgent demand for high-speed and high-sensitivity frequency measurement of broad-bandwidth radar signals.Receiver is a commonly used radar jammer,and its frequency measurement module,as a core module of radar countermeasure technology,directly determines the coverage bandwidth of signal monitoring,the real-time performance and sensitivity of signal processing.Considering the scarcity of FPGA resources,a rotation factor was designed to obtain an improved monobit frequency measurement algorithm,which avoided the deficiency that the traditional discrete Fourier transform relied too much on a large amount of multiplication operations.The random frequency sine signal of 0.2~2.2 GHz was tested,showing that the error was not excessively introduced,and the time and space complexity were greatly optimized.The Verilog code was written on the new RFSoC platform for actual test and simulation optimization,and the monobit frequency measurement performances of Base 16 to 256 were compared.The experimental results show:considering the response speed and sensitivity,the monobit frequency measurement of Base 64 is most suitable for the technological requirement of radar jamming with 2 GHz bandwidth,and can achieve the sensitivity of-50 dBm and the maximum frequency accuracy error of 18.75 MHz;in the frequency measurement time less than 100 ns,the fast frequency measurement for the 2.4 GHz bandwidth signal is realized.
作者
张宇祥
黄明
杨杰
郭宇航
周元翰
ZHANG Yuxiang;HUANG Ming;YANG Jie;GUO Yuhang;ZHOU Yuanhan(College of Engineering,North China University of Technology,Beijing 100144,China)
出处
《工业技术创新》
2023年第2期99-105,共7页
Industrial Technology Innovation
关键词
雷达对抗技术
干扰机
RFSoC平台
单比特测频算法
基64
Radar Countermeasure Technology
Jammer
RFSoC
Platform
Monobit Frequency MeasurementAlgorithm
Base64
