基于頻域分塊RDS-LMS算法的機(jī)載外輻射源雷達(dá)雜波對消

楊鵬程; 呂曉德; 柴致海; 張丹; 岳琦; 楊璟茂

doi:10.11999/JEIT170190

基于頻域分塊RDS-LMS算法的機(jī)載外輻射源雷達(dá)雜波對消

doi: 10.11999/JEIT170190

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出版歷程
- 收稿日期: 2017-03-02
- 修回日期: 2017-06-23
- 刊出日期: 2017-10-19

Clutter Cancellation for Airborne Passive Radar Based on Frequency-domain Block RDS-LMS Algorithm

摘要

摘要: 針對機(jī)載外輻射源雷達(dá)多普勒展寬的雜波對消問題，該文提出頻域分塊距離-多普勒-空間LMS(RDS-LMS)算法。該算法利用雜波的空時(shí)依賴性，沿雜波脊進(jìn)行對消，避免對雜波多普勒帶內(nèi)目標(biāo)的對消。通過頻域分塊處理，減小了迭代次數(shù)并可以利用FFT快速實(shí)現(xiàn)，降低了算法的計(jì)算量?；趯?shí)測數(shù)據(jù)的仿真結(jié)果表明：該算法能夠有效對消雜波，且對雜波帶內(nèi)的目標(biāo)影響很小，對徑向速度大于10 m/s的目標(biāo)，信噪比損失在1 dB以內(nèi)。計(jì)算復(fù)雜度分析表明：頻域分塊實(shí)現(xiàn)使算法計(jì)算量降低了42倍，根據(jù)在地基外輻射源雷達(dá)中已實(shí)時(shí)實(shí)現(xiàn)的FBLMS算法估算，結(jié)合GPU并行處理，該文算法處理1 s數(shù)據(jù)用時(shí)為771 ms，能夠滿足實(shí)時(shí)性需求。
- 機(jī)載外輻射源雷達(dá) /
- 雜波對消 /
- 多普勒展寬 /
- RDS-LMS /
- 頻域分塊 /
- 雜波脊
Abstract: A frequency-domain block Range-Doppler-Space Least-Mean-Square (RDS-LMS) algorithm is proposed for the cancellation of the Doppler spread of clutter for airborne passive radar. To avoid the cancellation of targets in the clutter Doppler band with the cancellation of clutter, this algorithm uses the spatial dependence of the clutter Doppler frequency and cancels clutter along the clutter ridge. With the frequency-domain block implementation, the iteration of adaptive processing is reduced and FFT can be employed. Hence, the computational load is reduced. Simulation results based on experimental data show that the proposed algorithm is able to cancel clutter effectively and more importantly it has slight influence on targets in clutter Doppler band. For example, for targets with radial velocity greater than 10 m/s, signal-to-noise ratio (SNR) loss is within 1 dB. Computational complexity analyses show that the frequency-domain block implementation reduces the computational load 42 times and according to the real-time implemented Frequency-Domain Block LMS (FBLMS) algorithm in ground based passive radar, the proposed algorithm needs 771 ms to process 1 s data with the help of parallel processing of Graphic Processing Unit (GPU) and can satisfy the need for the real-time implementation of airborne passive radar clutter cancellation.
- Airborne passive radar /
- Clutter cancellation /
- Doppler spread /
- Range-Doppler-Space Least-Mean- Square (RDS-LMS) /
- Frequency-domain block /
- Clutter ridge

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