Communications: directive radio wave systems and devices (e.g. – Directive – Beacon or receiver
Patent
1998-04-06
1999-11-16
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Beacon or receiver
342149, G01S 502
Patent
active
059866055
ABSTRACT:
A system and method for estimating azimuth angle, elevation angle and signal detection and which includes an antenna system having a plurality of elements, each element receiving a different concurrent portion of an incoming analog signal having a real and an imaginary portion. A converter is provided for each antenna element for converting each analog signal to digital form. A processor is provide for multiplying the sum of the real parts of the signals from a first group of the elements with the conjugate of the sum of the remainder of the elements to provided an estimated azimuth, elevation of signal detection measurement. In the case of a four element antenna, AzEst=Angle((A+B)*(C+D)Conjugate))=(x.sub.A +iy.sub.A +x.sub.B +iy.sub.B)*(x.sub.C -iy.sub.C +x.sub.D -iy.sub.D), ElEst=Angle((A+D)*(B+C)Conjugate))=(x.sub.A +iy.sub.A +x.sub.D +iy.sub.D)*(x.sub.B -iy.sub.B +x.sub.C -iy.sub.C) and Magnitude ((A+B*(C+D)Conjugate)) or Magnitude ((A+D*(B+C)Conjugate)). When the antenna system includes four antenna quadrants A, B, C and D, false detections due to responses coming from the sidelobe regions are suppressed by subtracting the offset OffsetAz=ScaleFactor*Magnitude(DeltaAz), where the offset is a scale factor to make the numbers come out correctly to provide a synthetic beam response: SyntheticAz=Magnitude((A+B)*(C+D)Conjugate)-OffsetAz the processor further including a comparator for comparing the Synthetic Az to a threshold to determine validity of the signal.
REFERENCES:
patent: 4368468 (1983-01-01), Lisle et al.
patent: 4628321 (1986-12-01), Martin
patent: 4646095 (1987-02-01), Kanter
patent: 4713666 (1987-12-01), Poux
Goudey, "A New Angle Estimator for Radar Tracking of Extended Targets", 1981 IEEE, 0547-3578/81/0000-0498, pp. 498-504.
Holmes Jerry D.
Priebe Leslie A.
Blum Theodore M.
Raytheon Company
LandOfFree
Method for improving monopulse processing of aperture segment ou does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for improving monopulse processing of aperture segment ou, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for improving monopulse processing of aperture segment ou will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1330096