雙基星載HRWS-SAR系統(tǒng)俯仰向DBF處理技術(shù)

林玉川; 張劍云; 武擁軍; 周青松

doi:10.11999/JEIT170012

雙基星載HRWS-SAR系統(tǒng)俯仰向DBF處理技術(shù)

doi: 10.11999/JEIT170012 cstr: 32379.14.JEIT170012

基金項(xiàng)目:

安徽省自然科學(xué)基金(1508085MF119)

計(jì)量
- 文章訪問數(shù): 1335
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- 被引次數(shù): 0
出版歷程
- 收稿日期: 2017-01-03
- 修回日期: 2017-05-03
- 刊出日期: 2017-10-19

Digital Beam-forming Scheme on Elevation for Bistatic Spaceborne High Resolution Wide Swath SAR

Funds:

The Natural Science Foundation of Anhui Province (1508085MF119)

摘要

摘要: 雙基星載高分辨率寬測繪帶SAR系統(tǒng)(HRWS-SAR)利用數(shù)字波束形成技術(shù)(DBF)將俯仰向多通道的回波信號進(jìn)行快時(shí)間域的相干合成，DBF處理性能必然受到雙基構(gòu)型的影響。該文針對一般雙基構(gòu)型的星載HRWS- SAR系統(tǒng)，推導(dǎo)了點(diǎn)目標(biāo)接收方向角與收發(fā)距離和之間的線性近似表達(dá)式，建立了俯仰向通道的回波信號模型，進(jìn)而構(gòu)建了一種時(shí)變加權(quán)與FIR濾波相結(jié)合的DBF處理方法，并給出了系統(tǒng)實(shí)現(xiàn)框圖。該文對幾種典型雙基構(gòu)型的星載HRWS-SAR系統(tǒng)DBF處理進(jìn)行了仿真，結(jié)果表明合理的雙基構(gòu)型能有效提升星載HRWS-SAR系統(tǒng)的DBF處理性能。
- 雙基SAR /
- 高分辨寬測繪帶 /
- 數(shù)字波束形成 /
- 雙基構(gòu)型
Abstract: In bistatic spaceborne High Resolution Wide Swath SAR (HRWS-SAR) system, the Digital Beam Forming (DBF) technique is employed to achieve the coherent combination of multi-channel signals in the fast time domain, and its performance is affected by the bistatic configuration. For a point target, the relationship between receiver aspect angle and the sum of transmitter distance and receiver distance is approximated by a linear function, and the echo signal model in elevation channel is built. Further, a DBF processing scheme is proposed, which combines the time-variant weighting and Finite Impulse Response (FIR) filtering, and the implementation block diagram is presented. The DBF processing is simulated in several typical bistatic configuration spaceborne HRWS-SAR systems. Simulation results show that the higher DBF performance can be achieved in the spaceborne HRWS-SAR system with rational bistatic configuration.
- Bistatic SAR /
- High Resolution Wide Swath (HRWS) /
- Digital Beam Forming (DBF) /
- Bistatic configuration

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