Apparatus for the detection of angles-of-arrival of radio frequency signals
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United States of America Statutory Invention Reg
Stats
-
Jun 2, 1987
Grant Date -
N/A
app pub date -
May 7, 1986
filing date -
May 7, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Incoming radio frequency signals from one or more remote transmitters, that may be changing or 'hopping' in frequency, are received at two closely spaced antennas. A pair of Chirp-Z transform processors are respectively coupled to said antennas. The transform processors are operated in synchronism and produce a pair of sampled comb filter output responses, each of which comprises a multiple of frequency 'bins' distributed over a given spectrum. The bins are read out of the Chirp-Z processors in a synchronous sequential order, and each bin is represented by a pair of signals in phase quadrature. The phase quadrature signals of corresponding bins are multiplied in a predetermined manner and the products thereof are selectively added and subtracted to provide a predetermined function (tan .PHI.) of the phase difference (.PHI.) between the signals incident on the pair of antennas. This predetermined function is coupled to a processor that calculates a trigonometric function (sin.sup.-1) thereof which is indicative of the angle-of-arrival of the incident wave(s).
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