A Robust Clutter Suppression Method for Airborne Non-sidelooking Radar
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摘要: 非正側(cè)視陣列構(gòu)型會導(dǎo)致機載雷達回波數(shù)據(jù)非均勻，從而嚴重削弱傳統(tǒng)空時自適應(yīng)處理算法的雜波抑制性能。針對此問題，該文提出一種對陣元誤差穩(wěn)健的非均勻雜波抑制方法。該方法首先根據(jù)雷達系統(tǒng)參數(shù)等先驗信息構(gòu)造雜波表示基；然后在考慮陣元誤差下對待檢測單元數(shù)據(jù)進行迭代的最小二乘擬合，文中推導(dǎo)出了該問題的閉式解；最后對擬合后的剩余數(shù)據(jù)進行脈沖多普勒處理以及恒虛警檢測。該方法不需要訓(xùn)練樣本，且能夠在沒有俯仰自由度的情況下對機載非正側(cè)視陣雷達的非均勻雜波進行有效抑制。仿真結(jié)果驗證了該方法的有效性。
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關(guān)鍵詞:
- 機載雷達 /
- 非正側(cè)視陣 /
- 非均勻雜波 /
- 雜波抑制 /
- 空時自適應(yīng)處理
Abstract: Non-sidelooking array configuration leads to heterogeneous airborne radar echo data, it degrades seriously the clutter suppression performance of the traditional Space-Time Adaptive Processing (STAP) algorithms. To solve this problem, a heterogeneous clutter suppression method, which is robust to array error, is proposed. Firstly, a clutter representation basis is constructed based on a priori information such as system parameters. Then, the test data is fitted in an iterative least square manner with consideration of array error, and the closed-form solution is derived and utilized here. Finally, pulse Doppler processing and constant false alarm detection are conducted on the residual data. The proposed method does not need any training sample and can effectively suppress the heterogeneous clutter for airborne non-sidelooking radar without elevation degree of freedom. Simulation results verify the validity of the proposed method. -
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