资源三号02星激光测高精度分析与验证

资源三号02星搭载了我国首台对地观测的卫星激光测高试验性载荷,对该载荷的精度进行了理论分析,并采用多个区域进行了实际精度验证,同时对其在航天测绘中的应用进行了试验。资源三号02星激光测高仪在平坦地区(坡度≤2°)的理论高程精度为0.85m、平面精度14.2m。试验表明,资源三号02星激光测高仪获得的有效测高数据约占23.89%,检校场区域其高程精度为0.89m,平面精度为14.76m;华北地区高精度DSM地形数据验证其高程精度为1.09m,内陆渤海海面上的激光高程精度为0.47m。将激光足印点作为高程控制点时,在陕西渭南试验区能将资源三号02星立体影像无地面控制的高程精度从11.54m提高到1.90m。虽然资源三号02星激光测高仪为试验性载荷,但试验结果证实国产卫星激光测高数据能有效提高立体影像无地面控制的高程精度,在全球测图工程中具有推广应用价值,建议后续立体测图卫星搭载业务化应用的激光测高仪。

Analysis and Validation of ZY-3 02 Satellite Laser Altimetry Data

ZY-3 02 satellite loaded with Chinese first earth observing satellite laser altimeter,and has been launched successfully on 30th May,2016.In this paper,the theoretical accuracy of the laser altimeter is analyzed,and several experimental areas are used to verify the actual accuracy.At the same time,the application of the laser altimetry data in the field of space-borne photogrammetry is tested.The laser altimetry theoretical accuracy of ZY-3 02 satellite in the flat area (slope less than 2 degrees) is about 0.85 m and 14.2 m in the elevation and planimetry direction,respectively.The effective laser altimetry data account for about 23.89％,and near the calibration field the elevation accuracy is 0.89 m,and planimetry accuracy is about 14.76 m.Moreover,the verified elevation accuracy is 1.09 m in the North China by high precision DSM terrain data,and laser footprint points accuracy on the surface of the Bahai inland sea is about 0.47 m.When the laser foot print point is used as elevation control point,the elevation accuracy of the ZY-3 02 satellite stereo images in Shaanxi Weinan can be increased from 11.54 m to 1.90 m without GCPs.Although ZY3-02 satellite laser altimeter is just a test,the results proved that the domestic satellite laser altimetry data can effectively improve the stereo images without GCPs,which will be valuable in the global mapping project.It is suggest that operational laser altimeter equip on the next satellite of ZY-3 serials.