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Class Information
Number: 342/439
Name: Communications: directive radio wave systems and devices (e.g., radar, radio navigation) > Directive > Beacon or receiver > Direction-finding receiver only > With plural fixed antenna pattern comparing > Including combined effect indicator
Description: Subject matter wherein comparison is made by a single indicating device which is responsive to at least two of the quantities to be compared.

Patents under this class:

Patent Number Title Of Patent Date Issued
8686913 Differential vector sensor Apr. 1, 2014
7924225 Direction finding antenna systems and methods for use thereof Apr. 12, 2011
7652626 Co-linear antenna for direction finding Jan. 26, 2010
6418374 Navigation device Jul. 9, 2002
6222486 Method for the precise angle determination of targets by means of a multiple-unit radar system Apr. 24, 2001
5146231 Electronic direction finder Sep. 8, 1992
4714929 Digital averaging filter particularly suited for use with air navigation receivers Dec. 22, 1987
4596987 PPI display apparatus Jun. 24, 1986
4210913 Passive detection and tracking apparatus Jul. 1, 1980
4129874 Antenna pattern combiner Dec. 12, 1978
3936832 System to process antenna beams to obtain the angular location of target with high resolution and accuracy Feb. 3, 1976

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