起算点精度对GPS基线的影响

The impact of the known points precision on GPS baselines

在工程测量中通常采用双差模型求解GPS基线,解算时要求知道一个端点的坐标,该坐标的精度对GPS基线的解算结果有影响.通过模拟计算发现,已知点的精度越低,基线的解算精度也越低。因此,为了保证GPS基线解算精度,必须采用高精度起算点,并给出了提高起算点精度的3种方法.

GPS technology is widely applied in engineering survey. Usually, the baselines are found with the double difference model. The coordinates of an end point are required to be known in solving the baselines. The precision of the known points has impact on the solutions of the baselines. It is found out in stimulation that the lower the precision of the known points, the lower the precision of the solved baselines. So to guarantee the necessary precision in solving baselines, the precise known point is used.Three methods for improving the known points precision are put forward.