Communications: directive radio wave systems and devices (e.g. – Determining distance – Altimeter
Patent
1987-09-17
1989-02-21
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
Determining distance
Altimeter
342122, G01S 1336
Patent
active
048069353
ABSTRACT:
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.
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Drake James R.
Fosket Timothy G.
Davis David L.
Sotomayor John B.
Tarcza Thomas H.
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