基于整周模糊度概率特性的GPS基线质量评估

Evaluation of GPS Baseline Quality Based on Probabilistic Characteristic of Integer Ambiguity

为简化GPS基线质量评估,给出了基线固定解概率分布的严密形式,并用仿真方法分析了积分区域、模糊度浮点解的精度、基线浮点解的精度以及2种浮点解的相关系数对GPS基线质量改进的作用.试验表明,模糊度浮点解和基线浮点解的精度以及二者的相关系数均是影响基线质量的重要因素,模糊度浮点解和基线浮点解的精度对基线质量的改进作用是"积极"的,而二者的相关系数对基线质量的改进作用则相反.

To simplify the evaluation of GPS （global positioning system） baseline quality, a closed- form probability density function （PDF） of fixed GPS baseline solution was presented, and the effects of some factors influencing the PDF of fixed GPS baseline solution, such as the integral region of the PDF, the precision of ambiguity float solution, the precision of baseline float solution and the correlation coefficient of the two solutions, on the improvement of GPS baseline quality were discussed through numerical analyses. The experimental results show that the precisions and correlation coefficient of the ambiguity float solution and the baseline float solution have a great effect on GPS baseline quality, and the precisions of the two solutions have a positive effect on the improvement of GPS baseline quality, while their correlation coefficient has a negative effect.