초록 ▼

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 provid

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.

대표청구항 ▼

[ We claim:] [1.] A system for estimating azimuth angle which comprises:(a) an antenna system having a plurality of elements, each of said elements receiving a different concurrent portion of an incoming analog signal having a real and an imaginary portion;(b) a converter for each said antenna eleme

[ We claim:] [1.] A system for estimating azimuth angle which comprises:(a) an antenna system having a plurality of elements, each of said elements receiving a different concurrent portion of an incoming analog signal having a real and an imaginary portion;(b) a converter for each said antenna element for converting each said analog signal to digital form; and(c) a processor for multiplying the sum of the real and imaginary parts of said signals from a first group of said elements with the sum of the conjugates of the real and imaginary parts of said signals from the remainder of said elements to provide an estimated azimuth measurement; re "group" includes one and where "angle" is defined as the angle relative to boresight.