Abstract:

Aiming at the problem that the traditional eight-beam ratio amplitude direction-finding system has huge calibration workload and high real-time requirement， this paper proposes a method to calibrate the system using only five angle points per angle interval， and uses field programmable gate array （FPGA） devices to complete the calibration according to the real-time requirement of the direction-finding system. The whole direction-finding system is divided into internal and external channels， and the system correction source is introduced into the internal channel to realize the dynamic correction of the direction-finding channel， reduce the system error and improve the maintainability of the system. Field test shows that the calibration method can reduce the testing workload and the final system direction finding accuracy meets the requirements of engineering application. The root mean square error of all band direction finding is 2.01°， and the real-time requirement can be achieved by using FPGA device.

Key words: radar signal, eight-beam specific amplitude direction-finding, correction method, direction-finding accuracy, real-time system, field programmable gate array（FPGA）

摘要：

针对传统八波束比幅测向系统校正工作量巨大以及系统实时性要求高的问题，提出每个角度区间仅利用5个角度点来实现对系统进行校正的方法，并根据测向系统的实时性要求使用现场可编程逻辑门阵列（FPGA）器件去完成。对测向链路进行分解，将整个测向系统分成内部和外部，并在内部通道引入系统校正源，实现了对测向通道的动态校正，减少了系统误差且提高了系统的可维护性。外场测试表明，采取上述校正方法可以减少测试工作量且最终的系统测向精度达到工程应用的要求，全频段测向均方根误差为2.01°，使用FPGA器件可以达到实时性的要求。

关键词: 雷达信号, 八波束比幅测向, 校正方法, 测向精度, 系统实时性, 可编程逻辑门阵列