機(jī)載順軌干涉合成孔徑雷達(dá)定標(biāo)中地面控制點(diǎn)的布設(shè)策略研究
doi: 10.11999/JEIT141220
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2.
(中國科學(xué)院電子學(xué)研究所 北京 100190) ②(中國科學(xué)院大學(xué) 北京 100190) ③(空間信息處理與應(yīng)用系統(tǒng)技術(shù)重點(diǎn)實(shí)驗(yàn)室 北京 100190)
基金項(xiàng)目:
國家自然科學(xué)基金(61101200)
Study on Ground Control Point Locating Strategy for Airborne Along-track Interferometric SAR
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2.
(Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China)
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摘要: 機(jī)載順軌干涉合成孔徑雷達(dá)(ATI-SAR)估計運(yùn)動目標(biāo)徑向速度的精度受干涉相位誤差、基線分量誤差等影響，因此為了得到較高的測速精度必須對ATI-SAR的系統(tǒng)參數(shù)進(jìn)行定標(biāo)處理。基于敏感度方程的定標(biāo)方法是干涉SAR定標(biāo)中的常用方法，但是其性能受敏感度矩陣條件數(shù)的影響，地面控制點(diǎn)(GCP)或角反射器的布設(shè)方式?jīng)Q定了敏感度矩陣的條件數(shù)大小。該文通過分析給出機(jī)載ATI-SAR系統(tǒng)定標(biāo)中GCP的布設(shè)策略，包括靜止GCP的布設(shè)方式及運(yùn)動GCP的數(shù)量、布設(shè)位置、運(yùn)動速度大小和方向的設(shè)置原則，并通過仿真手段對上述布設(shè)策略進(jìn)行了驗(yàn)證。
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關(guān)鍵詞:
- 合成孔徑雷達(dá) /
- 順軌干涉 /
- 定標(biāo) /
- 地面控制點(diǎn) /
- 矩陣條件數(shù)
Abstract: The accuracy of the radial velocity estimated by the airborne Along-Track Interferometric SAR (ATI-SAR) is affected by the accuracy of different system parameter, such as the interferometric phase biases and the baseline components errors. Therefore, these factors must be calibrated if the higher radial velocity estimation accuracy is required. The calibration methods based on the sensitivity equations are generally used in the interferometric SAR calibration. However, the performance of these methods is limited by the matrix condition number of the sensitivity matrix, which is decided by the location strategy of Ground Control Points (GCP). This study analyses and simulates the condition number of the sensitivity matrix corresponding to the different GCP distribution ways along the swath as well as the different selections of velocities and positions of moving ground control points. -
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