摘要:
在一般的雷達和通信系統(tǒng)中,實現(xiàn)中頻或射頻的直接采樣,需要完成數(shù)字正交解調(diào)過程,數(shù)字乘積檢波(DPD)是實現(xiàn)數(shù)字正交解調(diào)的一種工程上易于實現(xiàn)的方法,但該方法獲得的I/Q數(shù)據(jù)是需要修正的。該文結(jié)合合成孔徑雷達信號處理,提出了多相濾波法來修正通過DPD獲得的I/Q通道數(shù)據(jù),并和Bessel濾波進行了比較。仿真實驗結(jié)果表明,該方法簡便靈活,且工程上易于實現(xiàn);在濾波器階數(shù)相同的情況下,多相濾波器的最大絕對修正誤差為5.839410-4,而Bessel濾波的最大絕對修正誤差為9.30710-4,而且,多相濾波很容易實現(xiàn)非等距濾波。
Abstract:
In a general radar and communication system, the digital quadrature detection is necessary for implementing direct IF or RF sampling. The Digital Product Detection (DPD), applied easily in a real engineering, is a method to implement the digital quadrature detection. But the datum acquired by the method should be corrected. The paper presents the polyphase filtering to correct the I/Q datum acquired in combination with the Synthetic Aperture Radar (SAR) signal processing by contrast with Bessel filtering. The simulation results show that the method is simpler, more flexible and applied easily. The correct error by the polyphase filter with the same order is smaller than the error by the same order Bessel filter. The former maximum absolute error is 5.839410-4. The latter maximum absolute error is 9.30710-4. In addition, the polyphase filtering can implement the unequal interval filtering easily.
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