基于高动态BDS接收机高精度测速的需求,介绍了实现接收机速度测量的多普勒获取方法,分析了高动态应用下的多普勒精度,将加加速度动态下载波环路带宽和观测量更新频率对多普勒误差的影响进行了仿真,提出了通过增加环路带宽和提高观测量更新频率来改善加加速度应力下的测速偏差的方法.应用自研的高动态BDS接收机,对速度、加速度和加加速度3种动态应力下的测速精度进行了测试验证.结果表明,BDS接收机能够在10 000 m/s速度、100 g加速度动态下实现0.05 m/s的测速精度,改善后在50 g/s加加速度动态下可实现0.2 m/s的测速精度.%Based on the requirement of high accuracy velocity determination,the Doppler acquisition method for high dynamic BDS receiver velocity determination is introduced,and the Doppler accuracy in high dynamic application is analyzed.The influence of carrier loop bandwidth and observation frequency on Doppler error is analyzed.The velocity determination deviation under jerk is improved by increasing the loop bandwidth and updating the observation frequency.The accuracies of velocity determination under dynamic stresses of velocity,acceleration and jerk are tested by a self-developed high dynamic BDS receiver.The results show that the velocity determination accuracy of BDS receiver can be 0.05 m/s under 10 000 m/s velocity and 100 g acceleration,and 0.2 m/s under 50 g/s jerk after improvement.
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