由于卫星钟、接收机钟的误差以及无线电信号经过电离层和对流层中的延迟，实际测出的距离A与卫星到接收机的几何距离B有一定的差值，因此，一般称量测出的距离为伪距。
测控技术杂志社,测控在线—C-GPS协同式卫星定位技术研究 关键词：GPS;C-GPS;A-GPS;伪距;定位算法 [gap=546]Key words：GPS;C-GPS;A-GPS;pseudorange;location algorithm
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The pseudo-code phase can be only measured by the GPS receiver in the severely weak signal environment, so the full pseudo-range cannot be obtained.
当接收卫星信号极为微弱时,接收机仅能测量其伪码相位,而无法获取完整伪距。
参考来源 - 辅助型GPS定位系统关键技术研究The distances estimation algorithm between object and base-stations is studied in detail, which provides pseudo-distance observation data for location object’s status parament estimation.
2.深入研究了定位物体与定位基站的距离估计算法,为定位物体的位置、速度和姿态角等状态参数估计提供了伪距观测数据。
参考来源 - 类GPS超声定位系统关键技术研究The results show that using nonlinear process equation can further improve the performance, but using nonlinear pseudo-range equation has no significant improvement compared to the linearized pseudo-range equation.
结果表明：非线性系统方程可以进一步提高系统对方位角的估计性能：非线性伪距观测方程对组合系统的精度没有明显提高。
参考来源 - 非线性滤波方法在导航系统中的应用研究·2,447,543篇论文数据，部分数据来源于NoteExpress
伪距测量精度决定了伪距定位的精度。
The precision of pseudo-range measurement determines the precision of pseudo-range positioning.
伪距观测值的多普勒改正的符号与伪距变化率的符号相同。
The symbol of Doppler correction for pseudo range observations is the same as that of the rate of pseudo range variation.
对伪距残差最小二乘的接收机自主完整性监测（RAIM）算法进行了分析。
The characters of least squares residuals method belonging to receiver autonomous integrity monitoring(RAIM) were analyzed.
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