Communications: radio wave antennas – Antennas – Measuring signal energy
Patent
1999-02-17
2000-07-11
Le, Hoanganh
Communications: radio wave antennas
Antennas
Measuring signal energy
343713, 340903, 342174, H01Q 132
Patent
active
060879955
ABSTRACT:
An automobile collision avoidance radar antenna alignment system includes a first interferometer (506) with antennas (501) and (503) for alignment along an azimuth (x) axis of the collision avoidance radar antenna, and a second interferometer (508) with antennas (502) and (504) for alignment along an elevation (y) axis of the collision avoidance radar. Difference azimuth (.DELTA..sub.AZ) and difference elevation (.DELTA..sub.EL) outputs of the interferometers (506) and (508) are added (.DELTA..sub.T =.DELTA..sub.AZ +.DELTA..sub.EL) with the amplitude of (.DELTA..sub.T) provided at a power detector (526). Sum azimuth (.SIGMA..sub.AZ) and sum elevation (.SIGMA..sub.AZ) are added (.SIGMA..sub.T =.SIGMA..sub.AZ +.SIGMA..sub.EL) with the amplitude of (.SIGMA..sub.T) provided to a power detector (547). To align a collision avoidance radar antenna, the antennas of the antenna alignment system are positioned with a centerline parallel to the thrust vector of the automobile using a laser beam fixture 204. Azimuth and elevation translation errors (.DELTA.x) and (.DELTA.y) between antennas of the antenna alignment system and the antenna of the collision avoidance radar are removed by moving the antenna alignment system until the total difference signal (.DELTA..sub.T) is a minimum. The angle (.alpha.) between the boresite of the collision avoidance radar antenna and the thrust vector of the automobile is set to zero by adjusting the collision avoidance radar antenna until the total sum signal (.SIGMA..sub.T) is a maximum.
REFERENCES:
patent: 4041494 (1977-08-01), Ewen et al.
patent: 5111210 (1992-05-01), Morse
patent: 5314037 (1994-05-01), Shaw et al.
patent: 5646612 (1997-07-01), Byon
patent: 5977906 (1999-11-01), Ameen et al.
Bradley Donald A.
Grace Martin I.
Anritsu Company
Le Hoang-anh
Nguyen Hoang
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