航空重力测量中的GPS后处理解算软件

在航空重力测量的后期资料处理中,GPS技术主要作用是精确确定飞机的位置、速度和加速度,以提供可靠的飞机飞行参数和必要的重力加速度改正等.笔者以航空重力领域的实际需求,开发了航空重力的GPS后处理软件-EGPS.该软件能够利用伪距差分、多普勒频移的方法解算航空重力测量的载体位置、速度和加速度等.通过处理航空重力测量中GPS资料的速度解算实例,并与国外已经先进的航空重力测量处理软件的速度解算结果对比、分析,EGPS已经基本达到了航空重力测量领域对GPS速度高精度解算的要求.

THE DETERMINATION OF THE POSITION,VELOCITY AND ACCELERATION SOFTWARE FOR GPS IN AIRBORNE GRAVIMETRY

The key problem that airborne gravimetry has to solve is how to separate the disturbing accelerations generated by aviation from the total acceleration observed by gravimeter. The GPS technology is one of the methods to solve the problem. With it, we can get the position, velocity, acceleration and any other parameters of the aircraft carrier with high accuracy which can be used to make the necessary correction of the total acceleration. The authors have developed the GPS post-processing software system for airborne gravimetry, which is called EGPS, on the basis of the concept of software architecture. The software is the integration of different functional components according to certain interactive mode. EGPS uses the method of pseudo-range difference to get the position, and employs the method of Doppler frequency shift to get the velocity of the aircraft carrier with high accuracy. This paper presents the processing resuits of actual airborne gravimetry GPS data using EGPS. The data support a conclusion that EGPS has basically met the requirement of airborne gravimetry for GPS post-processing.