Communications: directive radio wave systems and devices (e.g. – Return signal controls radar system – Receiver
Reexamination Certificate
2006-09-27
2008-12-09
Gregory, Bernarr E (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Return signal controls radar system
Receiver
C342S089000, C342S091000, C342S092000, C342S118000, C342S120000, C342S165000, C342S173000, C342S175000, C342S195000
Reexamination Certificate
active
07463187
ABSTRACT:
A method to control a track gate and a level gate in an altimeter tracking an altitude of an airborne vehicle comprising emitting signals, directed toward a terrain, from the airborne vehicle, receiving terrain echo signals, positioning the track gate to a selected reference amplitude on the rising edge of the terrain echo signals, positioning the level gate to within a selected range of the peak amplitude level of the terrain echo signals, measuring a change in a location of the peak amplitude between sequentially received terrain echo signals, and varying a separation between the track gate and the level gate based on the measured change in the location of the peak amplitude. The terrain echo signals comprise reflections of the emitted signals from the terrain, and each terrain echo signal has a rising edge and a peak amplitude.
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J.R. Jensen, “Radar Altimeter Gate Tracking: Theory and Extension”; IEEE Transactions on Geoscience and Remote Sensing; vol. 37, No. 2; Mar. 1999.
Becker Robert C.
Stegemeyer Steven K.
Fogg & Powers LLC
Gregory Bernarr E
Honeywell International , Inc.
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