CAJ | 학술논문

为了揭示天空双基地预警雷达杂波的非平稳特性，对天空双基地预警雷达地面杂波特性进行了详细分析。首先建立了天空双基地预警雷达几何模型，然后对地面杂波的非平稳性进行了理论分析，最后仿真分析了地面杂波的非平稳特性及其对杂波抑制的影响。仿真结果表明，天空双基地预警雷达结构中杂波多普勒频率是随信号传播距离和双基结构发生变化的，杂波谱在距离上呈现严重的非平稳性，导致空时自适应处理时杂波协方差矩阵估计困难，无法获得理想的性能。
위료게시천공쌍기지예경뢰체잡파적비평은특성，대천공쌍기지예경뢰체지면잡파특성진행료상세분석。수선건립료천공쌍기지예경뢰체궤하모형，연후대지면잡파적비평은성진행료이론분석，최후방진분석료지면잡파적비평은특성급기대잡파억제적영향。방진결과표명，천공쌍기지예경뢰체결구중잡파다보륵빈솔시수신호전파거리화쌍기결구발생변화적，잡파보재거리상정현엄중적비평은성，도치공시자괄응처리시잡파협방차구진고계곤난，무법획득이상적성능。
To reveal the non-stationary characteristics of clutter for space-based bi-static early warning radar, we conduct a detailed analysis of its ground clutter characteristics. First, the geometric model of space-based bi-static early warning radar is established, next, the theoretical analysis of non-stationarity for ground clutter is carried out, and finally, the non-stationarity of ground clutter and its impact on the clutter suppression are also simulated and analyzed. Simulation results show that the ground clutter’s Doppler frequency varies with the range of signal propagation and the bi-static structure in the space-based bi-static early warning radar, and the clutter spectrum presents the serious non-stationarity, which results in the estimation of clutter covariance matrix being tough in STAP, thus being unable to achieve the perfect performance.