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针对系统要求实时在线测向的需求,提出了一种基于FPGA实现的机载阵列数字测向系统设计方案.该方案基于软件无线电的设计思想,利用了单片机实现RS接口与上位机通讯,配置系统工作参数,并设计了一种简单有效的在线自校准系统进行通道一致性校正,在FPGA中实现数据正交解调以及超分辨测向MUSIC算法.该测向系统硬件结构简单,软件参数配置灵活,测试结果表明:在快拍数不小于64点时,阵列测向误差小于0.5°,在快拍数为256点时,测向时间小于6ms,该方案能够实现MUSIC算法的准确、快速计算.
Aiming at the requirement of real-time on-line direction finding of system requirements, a design scheme of airborne array digital direction finding system based on FPGA is proposed. The scheme is based on the design idea of software radio and uses the singlechip to realize RS interface and host computer communication, And design a simple and effective on-line self-calibration system to calibrate the channel consistency and realize data orthogonality demodulation and super-resolution direction finding MUSIC algorithm in FPGA.This direction finding system has simple hardware structure and flexible configuration of software parameters The test results show that when the number of snapshots is not less than 64, the array orientation error is less than 0.5 °. When the number of snapshots is 256, the DF time is less than 6ms. This scheme can accurately and quickly calculate the MUSIC algorithm.