CAJ | 학술논문

利用距离多普勒算法对 HJ-1C（“环境一号”C）卫星图像进行定位，其初始定位精度为1100~1400m，不能很好地满足实际应用的需要。进一步分析后发现，HJ-1C卫星图像几何定位误差主要分布在方位向，通过对影响HJ-1C卫星几何定位精度的因素进行分析，得出合成孔径雷达（Synthetic Aperture Radar, SAR）时间误差是影响几何定位的关键因素，因此文章提出通过时间误差补偿提高HJ-1C卫星几何定位精度。该方法首先计算SAR时间误差，然后对SAR载荷时间进行补偿，最后利用距离多普勒算法进行定位，并对HJ-1C卫星图像进行了验证。结果表明，HJ-1C卫星定位精度提高到300m左右，得到了有效的改进。
이용거리다보륵산법대 HJ-1C（“배경일호”C）위성도상진행정위，기초시정위정도위1100~1400m，불능흔호지만족실제응용적수요。진일보분석후발현，HJ-1C위성도상궤하정위오차주요분포재방위향，통과대영향HJ-1C위성궤하정위정도적인소진행분석，득출합성공경뢰체（Synthetic Aperture Radar, SAR）시간오차시영향궤하정위적관건인소，인차문장제출통과시간오차보상제고HJ-1C위성궤하정위정도。해방법수선계산SAR시간오차，연후대SAR재하시간진행보상，최후이용거리다보륵산법진행정위，병대HJ-1C위성도상진행료험증。결과표명，HJ-1C위성정위정도제고도300m좌우，득도료유효적개진。
Range Doppler algorithm is used for image location of HJ-1C satellite . The initial location accuracy is about 1 100~1 400m, which cannot meet the needs of the application properly. Furthermore, azi-muth error is the major location error of HJ-1C image. By analyzing the impact factors on the HJ-1C satellite location accuracy, it is concluded that time error is the most critical factor affecting the geometric location. So the time error needs to be compensated. First SAR time errors need be calculated and compensated. Secondly, range Doppler algorithm is used for location. Finally the method is verified by HJ-1C satellite images. The re-sults indicate that location accuracy of HJ-1C satellite is improved from 1 100~1 400m to around 300m.