摘要
收发相位同步是双基地雷达相参处理的前提,相位同步误差会对改善因子产生影响。首先建立了考虑相位同步误差的相参检波信号模型,在此基础上,导出了相位同步误差对改善因子影响的关系式,最后通过仿真分别给出了不同杂波类型,不同重复频率时相位同步误差对改善因子影响的结果。仿真结果表明,相位同步误差越大,对各类杂波改善因子的影响也越大,当误差为10 Hz时,地杂波改善因子下降十几分贝,且载波频率为1 GHz时,若要求MTI改善因子为50 dB,稳定本振的频率稳定度需满足10-8的数量级。
Phase synchronization is the precondition of coherent processing for bistatic radar.Phase synchronization error has a influence on the improvement factor.A coherent signal model considering the phase synchronization error is presented.The expression of the influence of phase synchronization error on the improvement factor is then derived.Finally,the influence of phase synchronization error on the improvement factor in different clutter environments and at different pulse repetition frequencies are simulated and analyzed respectively.The simulation results suggest that the improvement factor decreases largely with the phase synchronization error getting bigger,and the frequency stability of local oscillator is required to be 10-8.
出处
《雷达科学与技术》
2011年第3期202-206,共5页
Radar Science and Technology
关键词
双基地雷达
相位同步
频率稳定度
改善因子
bistatic radar
phase synchronization
frequency stability
improvement factor
