A Robust Waveform Design of MIMO Radars for Improving Detection Performance of Space-Time Adaptive Processing

doi:10.7652/xjtuxb201808019

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A Robust Waveform Design of MIMO Radars for Improving Detection Performance of Space-Time Adaptive Processing

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- A Robust Waveform Design of MIMO Radars for Improving Detection Performance of Space-Time Adaptive Processing
- Vol. 52, Issue 8, Pages: 124-131(2018)
- 作者机构：
  
  周口师范学院机械与电气工程学院,河南,周口,466001
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201808019
  CLC： TN957
- Online First：10 August 2018，
  
  Published：2018
- 稿件说明：
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A Robust Waveform Design of MIMO Radars for Improving Detection Performance of Space-Time Adaptive Processing[J]. 2018, 52(8): 124-131.
DOI：

A Robust Waveform Design of MIMO Radars for Improving Detection Performance of Space-Time Adaptive Processing[J]. 2018, 52(8): 124-131. DOI： 10.7652/xjtuxb201808019.

摘要

针对基于多输入多输出(MIMO)正交频分复用(OFDM)雷达的空时自适应处理(STAP)方法的检测性能受未确知环境先验信息影响较大的问题

提出一种提升空时自适应检测性能的MIMO雷达稳健波形设计方法。首先构建杂波协方差矩阵估计误差模型

然后在此误差模型以及波形恒模特性约束下

基于最大化最差情况下的输出信干噪比准则

建立改善STAP检测概率稳健性的波形优化模型。为求解所得非线性波形优化模型

提出了基于对角加载的迭代方法

该迭代方法中每步均可转化为半定规划问题

因而可以获得高效求解。仿真结果表明

所提方法能够改善最差情况下的STAP检测概率

与非稳健方法以及不相关波形相比

可提高最差情况下MIMO-OFDM-STAP方法的输出信干噪比 2～4 dB。

Abstract

A robust waveform design method of multi-input multi-output(MIMO)radars for improving the detection performance of space-time adaptive processing(STAP)is presented to focus the issue that the detection performance of the MIMO-OFDM radar based STAP method is heavily affected by the unascertained environmental prior knowledge. An estimation error model for clutter covariance matrix is firstly constructed. Then

with the constraints of this error model and waveform constant modulus

the waveform optimization issue to improve the robustness of the detection probability of STAP can be formulated

which is based on the criterion of maximizing the worst-case output signal-to-interference plus noise ratio(SINR). To solve the resultant nonlinear waveform optimization problem

an iterative approach based on diagonal loading is developed. Each step in the proposed iterative method can be recast as a semidefinite programming

and can be solved in an efficient way. Simulation results show that the proposed approach can improve the detection probability of STAP in the worst case

and in comparisons with the uncorrelated waveforms and the non-robust algorithm

the proposed method can improve the worst-case output of MIMO-OFDM-STAP SINR by 2 - 4 dB.

关键词

Keywords

references

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