摘要
To obtain higher accurate position estimates, the stochastic model is estimated by using residual of observations, hence, the stochastic model describes the noise and bias in measurements more realistically. By using GPS data and broadcast ephemeris, the numerical results indicating the accurate position estimates at sub-meter level are obtainable.
获得更高精确的位置估计，随机的模型被估计由用观察的剩余，，因此随机的模型更写实地在大小描述噪音和偏爱。由使用 GPS 数据和广播位置推算历，在亚米水平显示精确位置估计的数字结果是可获得的。
基金
Supported by the National 863 Program of China （No.2006AA12Z325） and the National Natural Science Foundation of China （No.40274005）.
