A Strong Clutter Suppression Method for Space-Based Early Warning RadarUsing Subarray Multiple Input Multiple Output

ZHOU He; WU Jianxin; ZHANG Lei

doi:10.7652/xjtuxb202404016

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A Strong Clutter Suppression Method for Space-Based Early Warning RadarUsing Subarray Multiple Input Multiple Output

更新时间：2025-07-09

- A Strong Clutter Suppression Method for Space-Based Early Warning RadarUsing Subarray Multiple Input Multiple Output
- Vol. 58, Issue 4, Pages: 170-181(2024)
- 作者机构：
  
  中山大学电子与通信工程学院,广东,深圳,518107
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202404016
  CLC： TN958
- Online First：10 April 2024，
  
  Published：2024
- 稿件说明：
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ZHOU He, WU Jianxin, ZHANG Lei. A Strong Clutter Suppression Method for Space-Based Early Warning RadarUsing Subarray Multiple Input Multiple Output[J]. 2024, 58(4): 170-181.
DOI：

ZHOU He, WU Jianxin, ZHANG Lei. A Strong Clutter Suppression Method for Space-Based Early Warning RadarUsing Subarray Multiple Input Multiple Output[J]. 2024, 58(4): 170-181. DOI： 10.7652/xjtuxb202404016.

摘要

针对天基预警雷达因其高速平台运动带来严重的距离模糊和多普勒模糊

导致杂波背景强进而降低雷达目标检测性能的问题

提出一种基于子阵级多输入多输出天基预警雷达强杂波抑制方法。构建基于子阵级多输入多输出天基雷达模型并分析远距离机动目标相参性

确定目标出现线性距离徙动和不出现多普勒频率扩散时的最大相参积累时间

以保证长时间相参积累可行性; 针对多输入多输出雷达长驻留的特点采用长时间积累提高多普勒分辨率

降低一个距离-多普勒单元的杂波功率

在保证搜索效率的情况下降低该单元杂噪比

并采用3/5准则检测盲区图评估天基雷达检测性能; 在强杂波背景下改善了信杂噪比

提高了目标检测概率。实验仿真表明

所提方法相比相控阵雷达可有效降低杂波背景

在单脉冲重复频率下即可达到很好的检测效果

比相控阵雷达检测性能提高约20.48%。

Abstract

A method for strong clutter suppression in space-based early warning radar based on subarray-level multiple-input multiple-output(MIMO)is proposed to address the problem of severe distance blur and Doppler blur caused by the high-speed platform motion of space-based early warning radar

which leads to strong clutter background and reduced radar target detection performance. Initially

a subarray-level MIMO-based space-based radar model is constructed and the phase parameterization of the long-range maneuvering target is analyzed to determine the maximum phase parameter accumulation time when the target has linear distance migration and does not have Doppler frequency spread

ensuring the feasibility of long-time phase parameter accumulation. Subsequently

based on the characteristics of the MIMO radar's long dwell time

long-time accumulation is adopted to improve the Doppler resolution

reduce the clutter power of a distance-Doppler unit

lower the clutter-to-noise ratio(CNR)of the unit while ensuring the search efficiency

and evaluate the detection performance of the space-based radar by using the 3/5 criterion detection blind map. Ultimately

the signal-to-clutter noise ratio(SCNR)is improved in a strong clutter background

and the probability of target detection is increased. The experimental simulation shows that the proposed method can effectively reduce the clutter background compared with the phased array radar and can achieve a good detection effect under the single pulse repetition frequency. The detection performance is improved by about 20.48% compared with that of the phased array radar.

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