频率源振动对测速精度的影响

针对频率源振动会影响测速精度的问题,按照国军标车载设备的振动要求,对频率源振动带来的相位噪声进行仿真分析和实际测试。并以振动频率为5Hz为例,对10 MHz频率源进行测试计算得到相应短稳;然后计算频率源在静止和振动环境下的测速随机误差;最后通过比较得到频率源在振动时测速精度会恶化几个数量级的结果。建议在动中测速时,通过使用加速度灵敏度低的晶振,安装减震器,优化环路设计,采用数字补偿技术等措施以减少振动对测速精度的影响。

Source Vibration on Velocity Measurement Accuracy

As frequency source vibration affects the accuracy of velocity measurement,the simulation analysis and practical tests for phase noise caused by frequency source vibration are done in accordance with the requirements of national military standards on vehicle vibration equipment.Taking the vibration frequency of 5 Hz as an example,the test of 10 MHz frequency source is done and the short-term stability is obtained, and then the random error of velocity measurement of the frequency source is done in the static environment and vibration environment.As shown by the comparisons, the accuracy of frequency source in vibration velocity measurement can deteriorate by several orders of magnitude.For velocity measurement in a dynamic measurement, we recommend use of low acceleration sensitivity crystal oscillators, installation of shock absorbers, optimization of loop design, and digital compensation techniques to reduce the influence of vibration on the accuracy of velocity measurement.