基于多普勒譜優(yōu)化的HRWS SAR系統(tǒng)通道相位偏差估計(jì)算法
doi: 10.11999/JEIT161038
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1.
(西安電子科技大學(xué)雷達(dá)信號(hào)處理國(guó)家重點(diǎn)實(shí)驗(yàn)室 西安 710071) ②(上海衛(wèi)星工程研究所 上海 201109) ③(上海航天技術(shù)研究院 上海 201109)
基金項(xiàng)目:
國(guó)家自然科學(xué)基金(61471276, 61601298, 61671355)
Phase Bias Estimation Algorithm for HRWS SAR System in Azimuth Based on Doppler Spectrum Optimization
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1.
(National Laboratory of Radar Signal Processing, Xidian University, Xi&rsquo
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2.
(Shanghai Institute of Satellite Engineering, Shanghai 201109, China)
Funds:
The National Natural Science Foundation of China (61471276, 61601298, 61671355)
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摘要: 方位多通道SAR系統(tǒng)通過(guò)抑制多普勒模糊，能夠?qū)崿F(xiàn)高分辨率和寬測(cè)繪帶(HRWS)對(duì)地觀測(cè)。針對(duì)通道間幅相偏差會(huì)導(dǎo)致成像結(jié)果中出現(xiàn)目標(biāo)模糊分量的問(wèn)題，該文提出一種通道相位偏差估計(jì)算法。該算法利用通道間相位偏差會(huì)造成多通道重構(gòu)方位譜在主瓣內(nèi)展寬的特性，通過(guò)優(yōu)化多譜勒譜能夠?qū)崿F(xiàn)通道相位偏差的有效估計(jì)。該算法在通道相位偏差估計(jì)前不需要進(jìn)行多普勒中心估計(jì)，減小了由多普勒中心估計(jì)不準(zhǔn)引入的誤差，并且在低信噪比的情況下仍然具有良好的估計(jì)性能。基于仿真數(shù)據(jù)和實(shí)測(cè)數(shù)據(jù)的實(shí)驗(yàn)驗(yàn)證了該文算法的有效性。
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關(guān)鍵詞:
- 合成孔徑雷達(dá) /
- 高分辨率寬測(cè)繪帶 /
- 多通道 /
- 數(shù)字波束形成 /
- 通道相位偏差估計(jì) /
- 多普勒譜優(yōu)化
Abstract: By suppressing the Doppler ambiguity, the along-track multi-channel Synthetic Aperture Radar (SAR) system can simultaneously achieve High-Resolution and Wide-Swath (HRWS) imaging. However, the presence of unavoidable amplitude and phase bias tends to the absence of ambiguous signals in the SAR images. To address this issue, a novel phase bias estimation algorithm based on Doppler spectrum optimization is proposed. By exploiting the fact that phase bias can cause Doppler spectrum broadened, the phase bias can be successfully estimated by optimizing the Doppler spectrum. The Doppler centroid estimation can be avoided before phase biases estimation, which reduces the estimation accuracy caused by the inaccurate Doppler centroid. The proposed algorithm can achieve better performance when Signal to Noise Ratio (SNR) is low. The effectiveness of the algorithm is validated by experimental results carried out on simulated data and SAR data collected by an air- borne multi-channel system. -
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