Communications: directive radio wave systems and devices (e.g. – Directive – Including a steerable array
Patent
1997-04-21
1999-05-18
Hellner, Mark
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a steerable array
342445, 343893, 343705, H01Q3/22;1/28
Patent
active
059054638
ABSTRACT:
Aircraft-mounted Identification Friend or Foe (IFF) antennas employ a linear array of radiator elements positioned transverse to the boresight axis. With an azimuth determination capability, but lacking elevation resolution, such antennas are subject to coning errors in determining the azimuth bearing of a target at an altitude differential. With use of a linear array (10) of multi-radiator elements (11, 12, 13), an output signal (23) having the characteristic of an amplitude which increases for off-boresight targets is provided. That signal is compared to a typical form of antenna system output signal (22), which has an amplitude which decreases for off-boresight targets. By such amplitude comparison, the angle (.beta.) to a target is determined and used to provide an azimuth correction factor (53). An apparent azimuth bearing (54) subject to coning error can then be corrected (55) to provide the true azimuth angle to a target (56).
REFERENCES:
patent: 4616230 (1986-10-01), Antonucci et al.
patent: 5214436 (1993-05-01), Hannan
patent: 5457466 (1995-10-01), Rose
patent: 5546095 (1996-08-01), Lopez
Skolnik, Merrill I. "Introduction to Radar Systems", McGraw-Hill, pp. 160, 161, 1980.
Hellner Mark
Marconi Aerospace Systems Inc. Advanced Systems Division
Onders Edward A.
Robinson Kenneth P.
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