Coherence Performance Analysis for Distributed Aperture Coherent Radar
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摘要: 該文針對多脈沖發(fā)射協同結構的分布式全相參雷達，首先建立了全相參模式下的信號模型，然后推導了輸出信噪比增益(oSNRg)的解析式，并基于相干參數估計的克拉美-羅界(CRB)，利用多項式擬合，獲得了oSNRg上界的數值解。結果表明：增加發(fā)射天線數或脈沖數能夠提高oSNRg；而增加接收天線數能否提高oSNRg取決于輸入信噪比大小，輸入信噪比較大時則oSNRg隨之提高，較小時反而隨之下降。最后的仿真實驗驗證了研究結論的正確性。Abstract: For distributed aperture coherent radar with cooperative architecture and pulse trains, the signal mode in fully coherent work mode is proposed firstly. Then the analysis formula of output Signal-to-Noise Ratio gain (oSNRg) is derived, and the performance bound of oSNRg is developed by using polynomial fitting based on Cramer-Rao Bounds (CRB) of coherence parameters estimation. It is concluded that more transmitters or pulses make higher oSNRg. However, as the number of receivers increase, if the input SNR is high sufficiently, the oSNRg will gradually improve; if not, it will worsen. Finally, numerical examples demonstrate the validity of the theoretical results.
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