Monopulse receiver for a four arm log spiral antenna

Details Monopulse receiver for a four arm log spiral antenna Monopulse receiver for a four arm log spiral antenna

1984-09-04

1986-05-27

Blum, Theodore M.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343447, 343 16M, G01S 502, G01S 1300

Patent

active

045918627

ABSTRACT:
A method of apparatus for determining the rectangular coordinate direction angles of a source of radio signals received by a four arm log spiral antenna and then processed by a beam-forming network to simultaneously generate both sum and difference modes. The sum and difference IF signals are heterodyned to a sum IF signal .SIGMA. and a difference IF signal .DELTA.. The .SIGMA. and .DELTA. signals are combined in an IF network to provide three IF signals, namely .SIGMA.+.DELTA., .SIGMA.-j .DELTA. and j .SIGMA., which are thereafter amplitude limited by respective limiting amplifiers. The three limited signals are processed by two phase detectors, which generate voltages E.sub.x and E.sub.y corresponding respectively to the sine of the phase angles of the limited signals .SIGMA.+.DELTA. and .SIGMA.-j .DELTA. relative to the limited signal j .SIGMA.. Since each combination of the voltages E.sub.x and E.sub.y corresponds to a single set of rectangular coordinate direction angles, these direction angles are easily determined by a conventional computer.

REFERENCES:
patent: 3229293 (1966-01-01), Little et al.
patent: 3863259 (1975-01-01), Boughnou et al.
patent: 4220953 (1980-09-01), Carre
patent: 4331958 (1982-05-01), Lacomme
An Analysis of Wide-Band Microwave Monopulse Direction-Finding Technique; Bullock et al., IEEE Transactions on Aerospace & Electronic Systems, vol. AES-7, #1, Jan. 71, pp. 188-203.

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