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Class Information
Number: 342/122
Name: Communications: directive radio wave systems and devices (e.g., radar, radio navigation) > Determining distance > Altimeter > Fm type
Description: Subject matter wherein the radar altimeter carrier signal is frequency modified.

Patents under this class:
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Patent Number Title Of Patent Date Issued
RE42316 Systems and methods for self-test of a radar altimeter May. 3, 2011
7893864 Radar apparatus and control method of the same Feb. 22, 2011
7714774 False lock filter for pulsed radar altimeters May. 11, 2010
7701384 Antenna system for a micro air vehicle Apr. 20, 2010
7295151 Systems and methods for self-test of a radar altimeter Nov. 13, 2007
7259713 Ranging systems Aug. 21, 2007
7248342 Three-dimension imaging lidar Jul. 24, 2007
7239266 Radar altimeter Jul. 3, 2007
7161527 Navigation system Jan. 9, 2007
6992614 Radar altimeter Jan. 31, 2006
6977611 FM-CW altimeter detector Dec. 20, 2005
6897803 Radar altimeter with forward ranging capabilities May. 24, 2005
6812885 Radio altimeter test method and apparatus Nov. 2, 2004
6761064 Movement-detecting altimeter Jul. 13, 2004
6753806 Methods and apparatus to compensate for zero Doppler returns Jun. 22, 2004
6750807 Radar altimeter with forward obstacle avoidance capabilities Jun. 15, 2004
6744397 Systems and methods for target location Jun. 1, 2004
6731234 Radar anti-fade systems and methods May. 4, 2004
6486826 Arrangement for the precise distance measuring, in particular the filling level measuring Nov. 26, 2002
6476759 Method for the calibration of an FM/CW type radio altimeter, and radio altimeter designed for the implementation of this method Nov. 5, 2002
6437730 Method for checking an fm/cw type radio altimeter, and radio altimeter designed for the implementation of this method Aug. 20, 2002
6426717 Single antenna FM radio altimeter operating in a continuous wave mode and an interrupted continuous wave mode Jul. 30, 2002
6384770 Linearizing device for a frequency-modulation ramp and its application to a radio altimeter May. 7, 2002
6255982 Method of characterization of an overflown ground from a FM/CW radio altimeter signal Jul. 3, 2001
6255984 Sensor system Jul. 3, 2001
5999118 Method of spectral analysis, FM/CW type radio altimeter with digital processing Dec. 7, 1999
5963509 Method and device for distance measurement Oct. 5, 1999
5923283 Altimetric type measurement method for use on a satellite Jul. 13, 1999
5781148 Continuous wave radar altimeter Jul. 14, 1998
5719581 Low-cost radio altimeter Feb. 17, 1998
5477226 Low cost radar altimeter with accuracy enhancement Dec. 19, 1995
5442361 Microwave transceiver using a reflection pumped mixer Aug. 15, 1995
5387917 Radar fuze Feb. 7, 1995
5315258 Method and apparatus for determining the moisture content of a material May. 24, 1994
5072223 Radar system for measuring the nearest distance to an object Dec. 10, 1991
5047779 Aircraft radar altimeter with multiple target tracking capability Sep. 10, 1991
5047778 FMCW radar range tracker and method Sep. 10, 1991
5046010 Fixed-echo cancelling radio altimeter and method of operating same Sep. 3, 1991
5016016 Volume-scattered echo discrimination device for FM/CW range measuring radar and use in a radio altimeter May. 14, 1991
5014063 Integrated altimeter and doppler velocity sensor arrangement May. 7, 1991
4973967 Radioaltimeter type of detector and a proximity fuse equipped with such a detector Nov. 27, 1990
4958161 Frequency-modulated continuous-wave radar altimeter system Sep. 18, 1990
4947354 Measuring apparatus for detecting the distance "H" to an object Aug. 7, 1990
4945360 Radar altimeter Jul. 31, 1990
4912472 FM-CW radar apparatus Mar. 27, 1990
4857935 RF circuit arrangement Aug. 15, 1989
4812035 AM-FM laser radar Mar. 14, 1989
4806935 Closed loop velocity/altitude sensor for FM-CW doppler radars Feb. 21, 1989
4766436 Radar device for measuring the distance of the device to a surface Aug. 23, 1988
4758839 Terrain profile radar system Jul. 19, 1988

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