| 摘要: |
| 天基预警雷达系统中，由于卫星平台和目标间存在高速径向运动，回波信号会产生距离徙动和多普勒走动，导致FFT相参积累增益降低，不利于微弱目标检测。为了提高检测性能，需要准确估计出目标的运动参数，并对回波信号进行运动补偿。首先建立了目标回波模型，分析了回波距离徙动和多普勒走动特性；其次利用Keystone变换校正回波距离徙动，并通过对多普勒模糊数的广义最大似然估计和MTD处理估计出目标的径向速度；然后对校正后的回波信号在方位向作延迟自相关处理，再利用FFT和Jacobson校正算法估计出目标的径向加速度；最后通过仿真实验验证了本文算法的有效性。 |
| 关键词: 天基预警雷达 运动参数估计 Keystone变换 延迟自相关 Jacobsen校正算法 |
| DOI：DOI:10.3969/j.issn.1672-2337.2019.04.018 |
| 分类号:TN959.74 |
| 基金项目:学院科研创新基金重大基础研究专项课题(No.ZDJC0102) |
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| An Estimation Method of Target Motion Parameters for Space-Based Early Warning Radar |
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ZHOU Liang，YUAN Junquan，WANG Wantian，ZHENG Daikun
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Air Force Early Warning Academy，Wuhan 430019，China
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| Abstract: |
| In space-based early warning radar system，the echo signals will produce range migration and Doppler migration due to the high-speed radial motion between the satellite platform and the target，which leads to a decrease in the FFT coherent accumulation gain. This is not conducive to weak target detection. In order to improve the detection performance，it is necessary to accurately estimate the target motion parameters and make motion compensation for the echo signals. Firstly，the target echo model is established. The characteristics of range migration and Doppler migration are analyzed. Secondly，the Keystone transformation is used to correct echo range migration. The radial velocity of the target is estimated by the generalized maximum likelihood estimation of Dopplers fuzzy number and MTD processing. Then the corrected echo signal is subjected to the delayed autocorrelation processing in the azimuth direction，and the radial acceleration of the target is estimated by using FFT and Jacobson correction algorithm. Finally，the effectiveness of the proposed algorithm is verified by simulation experiments. |
| Key words: space-based early warning radar motion parameter estimation Keystone transform delayed autocorrelation Jacobsen correction algorithm |
