采用弱基准和抗差估计的重力网平差

摘要

A method of solving a synthetic adjustment of absolute and relative gravity network using faint datum , the determination of the weights about absolute and relative gravity measurements , robust estimation weights ,the choice of relative gravimeter's parameters are described in details ,respectively . Some computing results show that , the accuracy of gravity network can be enhanced by faint datum adjustment ,and robust estimation can reduce anomalous data's weights , of which the average error estimate of the unknown gravity values is ± 13 .6 × 10-8 m/s2 , and random errors satisfy normal distribution .%以沿海某测区绝对重力和相对重力网数据处理为例，详细描述了弱基准重力网平差的方法，绝对重力和相对重力先验权的确定，用抗差等价权来调整相对重力的权、重力仪参数的取舍。结果表明，弱基准能有效地提高整网的精度；抗差估计能有效地探测并降低异常数据的权。重力点平均中误差为13．6×10－8 m s－2，偶然误差检验符合正态分布。