公开(公告)号：US4806935A

公开(公告)日：1989-02-21

申请号：US97772

申请日：1987-09-17

申请人： Timothy G. Fosket ,  James R. Drake

发明人： Timothy G. Fosket ,  James R. Drake

IPC分类号： G01S7/40 ,  G01S13/34 ,  G01S13/60 ,  G01S13/88 ,  G01S13/36

CPC分类号： G01S7/4056 ,  G01S13/342 ,  G01S13/60 ,  G01S13/882

摘要： A Doppler navigation system includes an altimeter section with increased accuracy resulting from closed loop operation of signal processing portions for reflected signals including phase shift information. Quadrature processing of the reflected signal includes compensation for differences between quadrature processing channels, wherein the reflected signals are periodically processed by alternate ones of the channels. A maximum amplitude signal is forwarded by the signal processing portions to a frequency tracker of the navigation system. Periodic calibration of the altimeter section corrects for delays introduced in the signal processing portions. Effects of FM to AM conversion in a Gunn oscillator are reduced by connection of the signal processing portions to a short circuit during the calibration periods.

摘要翻译： 多普勒导航系统包括由包括相移信息的反射信号的信号处理部分的闭环操作导致的具有增加精度的高度计部分。 反射信号的正交处理包括对正交处理通道之间的差异的补偿，其中反射信号由交替的通道周期性地处理。 最大幅度信号由信号处理部分转发到导航系统的频率跟踪器。 高度计部分的定期校准校正信号处理部分中引入的延迟。 通过在校准周期期间信号处理部分与短路的连接来减小Gunn振荡器中的FM到AM转换的影响。