基于波束域分塊RDLMS的機載外輻射源雷達雜波對消算法

楊鵬程; 呂曉德; 劉宇; 柴致海; 張丹

doi:10.11999/JEIT160595

基于波束域分塊RDLMS的機載外輻射源雷達雜波對消算法

doi: 10.11999/JEIT160595 cstr: 32379.14.JEIT160595

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出版歷程
- 收稿日期: 2016-06-03
- 修回日期: 2016-10-26
- 刊出日期: 2017-04-19

Clutter Cancellation Algorithm for Airborne Passive Radar Based on Block RDLMS in Beam Domain

摘要

摘要: 針對機載外輻射源雷達多普勒展寬的雜波對消問題，該文首先從降低計算量的角度出發(fā)，提出了波束域分塊RDLMS算法。通過波束形成降低了多普勒維對消階數(shù)，通過分塊減小了迭代次數(shù)并可以利用FFT快速實現(xiàn)。分析表明，所提算法能夠大幅降低雜波對消的計算量，為實時處理提供了支撐。其次，在處理性能方面，由于算法對所有濾波器系數(shù)采用相同的步長，當雜噪比較高時會有較大的對消殘余；根據(jù)系數(shù)比例自適應算法的思想，該文提出了改進算法，對不同的濾波器系數(shù)采用不同的步長，步長的大小與濾波器系數(shù)的對數(shù)成正比。仿真表明，改進算法使雜波對消殘余降低了1.3 dB，對消性能接近理想。
- 機載外輻射源雷達 /
- 雜波對消 /
- 分塊RDLMS /
- 波束域 /
- 步長矩陣
Abstract: For the cancellation of Doppler-spreading clutters of airborne passive radar, firstly, Block RDLMS in beam domain is proposed in order to reduce computational load. In the proposed algorithm, the order of cancellation in Doppler dimension is reduced by beamforming, and the iteration of adaptive processing is reduced by data segmenting, while FFT can be employed. It is verified that the proposed algorithm can reduce computational load substantially, which is valuable for real-time cancellation. Secondly, the improved algorithm is developed based on the idea of proportionate adaptation. Because the same step is assigned to all weights in the proposed algorithm, there will be relatively more residual clutter when the Clutter to Noise Ratio (CNR) is higher. The improved algorithm will assign different steps proportional to the logarithm of corresponding weights. Simulations show that by using the improved algorithm the residual is reduced 1.3dB and the performance of clutter cancellation approaches the ideal case.
- Airborne passive radar /
- Clutter cancellation /
- Block RDLMS /
- Beam domain /
- Step matrix

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