子阵级数字阵列雷达单脉冲测角精度影响因素分析

Analysis of digital monopulse angle estimation precision of DAR at subarray-level

为了提高子阵级数字阵列雷达(DAR)单脉冲测角精度以及算法稳健性,针对数字干涉法和数字相位和差单脉冲测角方法进行了对比试验性仿真。对基于子阵级DAR的两种方法进行了原理分析和测角建模,并重点针对影响测角性能的主要因素如信噪比、幅相误差(重点是子阵级)以及波束指向偏差等进行了性能对比仿真分析,仿真结果表明:当目标信噪比超过10dB时,干涉测角算法测角性能比相位和差法更加稳健(尤其是当波束指向误差较大时)。仿真结果和结论可以为子阵级DAR系统工程化设计提供参考。

In order to improve digital monopulse angle estimation accuracy and algorithm stability of digital array radar（DAR） at subarray-level, comparative simulation experiments of two methods are carried out, including digital interferometry and digital sum-difference phase-comparison. Firstly, principles and modeling of two methods are introduced, and then the performance comparison and analysis are developed, including several main factors which impact on angle measuring accuracy： the signal-to-noise ratio（SNR）, the amplitude and phase errors at subarray-level, the beam pointing errors etc. Simulation results show that： when target SNR exceed 10dB, the interferometric algorithm can obtain more robustness especially in large beam pointing errors. The simulation results and conclusion can be used for guiding subarray-level DAR system engineering.