We apply the least squares estimate to calculate GPS single point positioning equation and precision estimate, and put forward the new satellites' constellation choice algorithm.
将最小二乘法应用于解算GPS定位方程，并对其进行精度估计，提出了一种新的星座选择算法。
According to position model, GPS is divided into single-point positioning and DGPS.
依据定位方式，GPS定位可分为绝对定位和相对定位。
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