In order to solve the problem of GNSS position precision error increasing, this paper puts forward a kind of GNSS pseudorange measurement positioning model based on the least square method. Used the least squares method to iterate guidance solving, and adopted target position solving of five-satellites ECI coordinate system to simulate and verify. The simulation results show that location error accuracy calculated by locating model can reach 10-1 m, velocity error accuracy can reach 10-2m/s. Final conclusion shows that the simulation results of the GNSS pseudorange measurements positioning based on the least square method, which is put forwarded in this paper, can satisfy the positioning accuracy. At the same time, we can solve the problem of positioning error increases by using the model.%为解决GNSS导航定位精度误差增大的问题,提出一种基于最小二乘法的GNSS伪距测量定位模型.通过最小二乘法对导航解进行迭代校正,采用五卫星的ECI坐标系的目标位置求解来进行仿真验证.仿真结果表明:通过定位模型解算出的定位位置精度误差可达10-1 m,速度精度误差可达10-2 m/s,能够满足定位精度.同时,通过使用该模型可以解决定位误差增大的问题.
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