平臺(tái)運(yùn)動(dòng)測(cè)量誤差對(duì)陣列天線合成孔徑雷達(dá)三維成像影響分析
doi: 10.11999/JEIT141106
基金項(xiàng)目:
國(guó)家自然科學(xué)基金(61372186)資助課題
Impact Analysis of Motion Measurement Error on Array Antenna SAR Three Dimensional Imaging
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摘要: 陣列天線合成孔徑雷達(dá)(SAR)可實(shí)現(xiàn)3維成像。為了提高成像質(zhì)量,使用測(cè)量設(shè)備獲取平臺(tái)的運(yùn)動(dòng)信息以進(jìn)行運(yùn)動(dòng)補(bǔ)償,而測(cè)量誤差會(huì)影響補(bǔ)償及成像質(zhì)量,需對(duì)其進(jìn)行分析。該文首先建立了陣列天線SAR 3維成像模型和測(cè)量誤差分析模型,接著分別從位置和姿態(tài)角兩個(gè)方面分析了測(cè)量誤差對(duì)相位誤差的影響,并比較不同方向誤差影響的大小,然后通過仿真分析了誤差對(duì)成像指標(biāo)的影響,并引入姿態(tài)誤差基線比來量化姿態(tài)角誤差的影響。最后得出高程向和橫滾角測(cè)量誤差影響最大的結(jié)論,給出了限定要求下測(cè)量誤差的容忍值。該文的結(jié)論為測(cè)量設(shè)備的選取和設(shè)計(jì)以及成像和補(bǔ)償方法的選擇和分析提供了理論指導(dǎo)和參考。
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關(guān)鍵詞:
- 合成孔徑雷達(dá) /
- 陣列天線 /
- 3維成像 /
- 測(cè)量誤差 /
- 誤差分析
Abstract: The array antenna SAR is able to realize the three dimensional imaging. In order to improve the imaging quality, the measurement equipment is adopted to acquire the motion information of the array antennas platform for the motion compensation. However, the measurement error may impact the quality of compensation and imaging. Therefore analysis of the impact is indispensable. This paper establishes the imaging model and the measurement error analysis model, analyses the impact on phase error from the aspect of position and angle measurement error respectively, compares the impact of measurement error in the different directions, analyses the impact on imaging index by the simulation, and introduces the idea of angle-error-array-length-ratio to quantify the impact of angle error. The conclusion that the measurement error in the height and roll angle has the biggest impact is proposed and the error tolerance in certain conditions is given at last, which provides the theoretical guidance and reference for the choice and design of the measurement equipment and the motion compensation method.-
Key words:
- SAR /
- Array antenna /
- Three dimensional imaging /
- Measurement error /
- Error analysis
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