機(jī)載編隊(duì)飛行InSAR的運(yùn)動(dòng)誤差分析與補(bǔ)償
Motion Error Analysis and Compensation for Airborne Formation Flying InSAR
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摘要: 該文分析了機(jī)載編隊(duì)飛行InSAR中的運(yùn)動(dòng)誤差問(wèn)題。將飛機(jī)間距變化(垂直航跡的基線變化)情況分為間距逐漸增大、間距逐漸減小、間距呈正弦曲線規(guī)律變化3種情況討論。推導(dǎo)了相位變化與基線變化的定量關(guān)系, 給出了飛機(jī)間距變化和速度差異的仿真結(jié)果。采用方位向去斜坡處理,提出在測(cè)繪區(qū)域內(nèi)放置兩個(gè)控制點(diǎn),補(bǔ)償基線變化導(dǎo)致的相位誤差,可以大幅度地提高整片區(qū)域數(shù)字高度模型的精度。仿真結(jié)果說(shuō)明該分析正確。
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關(guān)鍵詞:
- InSAR; 編隊(duì)飛行; 運(yùn)動(dòng)誤差
Abstract: Motion error problem for airborne formation flying InSAR is analyzed. The plane interval changes (across track baseline changes) are discussed in three situations: interval increasing, interval decreasing, interval changing according to sine curve. Phase changes with baseline changes are derived quantificationally. The simulation result of plane interval changes and velocity difference are given out. Azimuth slope eliminating is adopted. Two control points are set in topographic area to compensate the phase error of baseline changes. This algorithm can improve the digital elevation model precision for whole area. The simulation results prove that the analysis is right. -
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