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中文摘要：
针对低成本GPS接收机只能观测到单频伪距和相位的情况,提出了利用伪距差分法测定载体速度的方法,给出了相邻历元和历元间伪距差分测速的公式,并分析了其精度。用一组机载和一组车载实测数据对伪距差分测定速度方法进行了验证,结果表明,由于车载系统受外界的干扰较大,相比于机载系统,其测速精度较低;对于不同的观测环境、接收机类型以及运动状态,差分历元对数n的大小对伪距差分测速精度的影响也会不同;接收机本身的特性对伪距差分测速精度的影响较大。
英文摘要：
Velocity determination of kinematic vehicle is important. Low-cost GPS receiver can only measure the pseudoranges and the carrier phase without the Doppler measurements. A new method for velocity determination by derived pseudoranges is presented. The formulas of derived pseudoranges are given and the precision of the velocity is analyzed. This method is applied to two actual experiments of aircraft and vehicle applications. Experimental results shown that the precision of vehicle application is lower than that of aircraft application. The influence of derived epochs number on the precision of velocity is different based on different environments, receivers and dynamic states. And the character of the receiver also takes great influence on the precision of velocity.
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