远距离目标位置解算方法的实现

Realization of location computation of long-distance object

目标位置解算装置是快速、准确获取空中或地面目标坐标的有效手段,该装置将传统目标定位方法的几个独立操作集成在一个系统中,由GPS接收机直接获取观测点坐标参数,激光测距机提供目标距离参数,方位获取设备提供目标方位参数,最后由解算模块对目标位置进行解算.在目标位置解算过程中,建立目标局部坐标系,根据地球的椭球模型,建立相应的地心坐标系.根据求得的目标局部坐标系与地心坐标系的转换关系,解算空中或地面目标相对于地心坐标系的大地坐标参数.通过对已知的WGS-84坐标系下的地面固定目标进行测试,在30 km的探测距离上,达到了目标定位误差绝对值小于1%的精度要求.

The equipment for location computation of object is effective to get the location of object quickly and accurately, in which the target distance parameter is offered by laser range finder, the geodetic position of observation point is obtained by GPS, azimuth and pitch angles are offered by azimuth compass. In the process of location computation of object, a local coordinate system of object is established, and a corresponding geocentric coordinate system is established in terms of ellipsoidal model of the earth. Conversion matrix between the local coordinate system and the geocentric coordinate system of object is solved to compute the geodetic coordinate of object in the air or on the ground relative to geocentric coordinate system. By testing the fixed targets on the ground with known coordinate values in WGS -84 coordinate system, the location accuracy with error less than 1% is achieved at a distance of 30 km, which meets the precision requirement.