激光捷联惯导车载重力测量试验

惯性导航系统中加速度计测量的比力是载体运动加速度与重力加速度的矢量和，当载体运动加速度能够被有效分离时，满足一定精度水平的惯性导航系统就可以成为动态重力仪。捷联式惯性导航系统体积小、重量轻、系统组成简单，可以在记录下惯性器件原始输出信息之后，通过离线处理过程进行数据处理和精度挖掘。本文通过对某高精度激光捷联惯导进行相应的软硬件更改，获得了兼具导航及重力测量功能的一体式动态重力仪。地面车载试验是验证动态重力仪的测量精度的有效手段之一，本文将一组高速公路重复测线的数据进行了处理和分析，结果表明在平均车速72km/hr的条件下，半波长分辨率2km，自由空间重力异常内符合精度优于1mGal。

Gravimetry Tests of Laser Strapdown INS on Ground-vehicel

The composition of kinematic acceleration and gravity is measured by accelerometers in INS. If the kinematic acceleration could be identified, the INS according with specific precision serves as a dynamic gravimeter. The strapdown inertial navigation system is small in volume, light in weight and simple in composing. The output information of the inertial components is saved by data recorder. The data can be calculated and analyzed by off line program. In the paper a laser strapdown inertial navigation system is rebuilt as a dynamic gravimeter by modifying its software and hardware, which has navigation and gravimetry functions at the same time. The test on ground-vehicle is a efficient means to validate the dynamic precision of the gravimeter. A set of measurement data getting from highway repeat line survey is handled and analyzed. The results show that the prototype is satisfied with the accuracy of 1 mGal and the resolution of 2km at 72km/hr steering speed.