强干扰环境下基于最大信干噪比准则的联合波束形成与伪码捕获方法

Joint PN Code Acquisition and Beamforming based on Maximizing SINR under Jamming

在阵列天线直接序列扩频遥测系统中,联合波束形成与伪码捕获可以最大限度的利用阵列增益提高低信噪比下的捕获性能。考虑强干扰环境下的大系统扩展比多目标测控,分析了基于NLMS权值搜索与伪码捕获方法的抗干扰容限,提出了基于最大信干噪比(SINR)准则的自适应波束形成与伪码捕获联合实现方法,根据伪码相位搜索的滑动相关运算结果估计信号功率,最大化输出SINR实现自适应波束形成。计算机仿真表明,最大化SINR波束形成与伪码捕获联合方法的捕获性能更优,在低信噪比和强干扰环境下可以有效实现空间自适应波束形成和快速伪码捕获,并已成功应用于某遥测系统。

In the direct sequence spread spectrum（DSS） telemetry system with multi-antennas,joint PN code acquisition and digital beamforming exploits the array gain during the PN code acquisition,which improve the acquisition performance under small SNR （signal-to-noise）.Considered the problem of multi-objective telemetry and control with large spread spectrum factor under jamming,the disabled application of combing PN code acquisition with weights searching based on NLMS algorithm is analyzed and a novel joint code acquisition and adaptive beamforming maximizing the signal-to-interference-plus-noise-ratio（SINR） is proposed,in which the signal power is estimated from the output of sliding correlator and digital beamforming is completed adaptively to maximize the SINR.Simulation results show that the proposed joint PN code acquisition and beamforming approach has better performance and it is effective to complete PN code acquisition and digital beamforming rapidly with small SNR and strong jamming,which has been used successfully in a telemetry system.