Method for reducing errors due to source amplitude modulation in a sequential amplitude comparison direction finding system
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United States of America Patent
Stats
-
Dec 1, 1981
Grant Date -
N/A
app pub date -
Mar 3, 1980
filing date -
Mar 3, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A technique and apparatus are disclosed which greatly reduce error in sping antenna direction finding systems due to amplitude modulation of the source. A second omnidirectional antenna and its associated receiver are used in two alternative methods to reduce error. Embodiment one uses the second receiver, having automatic gain control, to control the gain of the first receiver, having input from the spinning antenna and outputting a signal for display. Embodiment two uses two log receivers, one receiving signals from the omnidirectional antenna and the other receiving signals from the spinning antenna. The outputs of the two log receivers are then combined and inputted to an amplifier which may have an inverse log characteristic and the amplifier signal outputted to a display.
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