Communications: directive radio wave systems and devices (e.g. – Directive – Beacon or receiver
Patent
1986-05-07
1987-06-02
Buczinski, Stephen C.
Communications: directive radio wave systems and devices (e.g.,
Directive
Beacon or receiver
342424, G01S 130, G01S 502
Patent
active
H00002925
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).
REFERENCES:
patent: 4443801 (1984-04-01), Klose et al.
"Applications of High Speed Charge Transfer Devices" by B. T. French, The fth International Conference on CCDs, Sep. 1979, pp. 279-279n.
French Barry T.
Klose Dirk R.
Szentirmai George
Buczinski Stephen C.
Kanars Sheldon
Lane Anthony T.
Mullarney John K.
The United States of America as represented by the Secretary of
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