摘要
无源双基地雷达(Passive Bistatic Radar,PBR)利用外辐射源发射的信号实现对目标的探测,而在回波数据中,外辐射源的直达波干扰(Direct Path Interference,DPI)信号具有较强的功率,容易对弱目标的检测带来影响,因此对直达波的抑制是PBR信号处理的重要内容。智能反射表面(Intelligent Reflect Surface,IRS)可以控制入射波的反射方向,实现对电磁波传播的控制。为此本文将IRS应用于PBR的DPI的抑制,在雷达接收机附近放置IRS,通过优化IRS各个单元的离散相位,将回波中的DPI功率约束在一定范围内,并最大化目标回波的功率。该优化问题是非凸的二次约束二次规划,利用坐标上升法,可以得到较为满意的结果。计算机仿真分析表明,在接收机附近放置中等尺寸的IRS,信干噪比(Signal to Interference plus Noise Ratio,SINR)可以提升8 dB左右。
Passive bistatic radar(PBR)uses the signals transmitted by external emitters to detect targets.In the echo data,the direct path interference(DPI)of external emitters has strong power,which will affect the detection of weak targets.Therefore,the suppression of DPI is an important part of PBR signal processing.The intelligent reflection surface(IRS)can control the reflection direction of the incident wave and realize the control of electromagnetic wave propagation.For this reason,this paper applies IRS to the suppression of PBR direct wave.By placing IRS near the ra-dar receiver and optimizing the discrete phase of each element of the IRS,the DPI power is constrained within a certain range to maximize the power of the target echo.The optimization problem is a nonconvex quadratic constrained quadrat-ic programming.Using the coordinate ascent method,a satisfactory result can be obtained.Computer simulation shows that the signal to interference plus noise ratio(SINR)can be improved by 8 dB when a medium size IRS is placed near the receiver.
作者
邹鲲
杨宾锋
来磊
李伟
ZOU Kun;YANG Binfeng;LAI Lei;LI Wei(School of Information and Navigation,Air Force Engineering University,Xi’an 710077,China)
出处
《雷达科学与技术》
北大核心
2023年第5期482-488,共7页
Radar Science and Technology
基金
陕西省自然科学基金(No.2020JM⁃343)。
