基于BP-PID控制的载波频率准确度提高算法

转发式卫星导航系统是我国自主研发的一种新型卫星导航体制和系统, 但由于受到上行链路多普勒与卫星转发器的影响, 系统载波频率准确度量级为10^-8, 达不到系统载波频率的使用精度。为解决此问题, 详细分析了恶化转发式卫星导航系统载波频率的影响因素, 通过测量分析得到上行载波频率的预偏量, 采用基于反向传播神经网络的比例积分微分控制方法, 对上行载波频率进行实时控制调整。对控制调整算法进行仿真验证, 响应时间为50 s, 控制残差的均方根误差为0.022 Hz。采用卫星实际观测数据, 结果表明系统载波频率准确度量级从10^-8提升至10^-14, 可满足于转发式卫星导航系统载波频率及载波相位的应用。

Carrier frequency accuracy improvement algorithm based on BP-PID control

The forwarding satellite navigation system is a new type of satellite navigation structure and system independently researched and developed in China. However, due to the influence of uplink Doppler and satellite transponder, the carrier frequency accuracy order of the system is 10^-8, which cannot reach the accuracy of the carrier frequency of the system. In order to solve this problem, the factors that aggravate the carrier frequency of the forwarding satellite navigation system are analyzed in detail, and the pre-offset of uplink carrier frequency is obtained by measurement and analysis. The uplink carrier frequency is controlled and adjusted in real time by proportion integration differentiation control method based on back propagation neural network. The control adjustment algorithm is simulated and verified, the response time is 50 s and the root mean square error of the control residual is 0.022 Hz. Using the actual satellite observation data, the results show that the carrier frequency accuracy order of the system is improved from 10^-8 to 10^-14, which is suitable for the application of the carrier frequency and carrier phase of the forwarding satellite navigation system.