Communications: directive radio wave systems and devices (e.g. – Determining direction – Monopulse
Patent
1988-11-03
1989-09-12
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
Determining direction
Monopulse
342152, 342194, 375 94, 329316, 329345, 329341, H03D 100
Patent
active
048664499
ABSTRACT:
A multichannel processor for signals modulated onto a common IF frequency includes first and second analog-to-digital converters (ADC) for first and second channels, respectively. Each ADC receives a 4XIF frequency clock for producing digital samples, which are applied to a pair of gates for alternately coupling the digital signal to two signal paths. Each signal path alternately negates and does not negate the signals passing therethrough, thereby generating baseband I and Q signals for that channel. Since each channel has a separate ADC, there may be amplitude and temporal error between the channels. One of the channels is selected as a reference, and uses a pair of interpolators to produce samples representing the I and Q signal values at a common time between clock pulses. The other channels include controllable interpolators which are adjusted so that their I, Q common times correspond to that of the reference channel. In one embodiment, the processing is done in a monopulse radar system, and the sum channel is selected as reference.
REFERENCES:
patent: 3659229 (1972-04-01), Milton
patent: 3703003 (1972-11-01), Diamond
patent: 3703998 (1974-02-01), Pearson, Jr. et al.
patent: 4438452 (1984-03-01), Powers
patent: 4602273 (1986-07-01), Carlson
patent: 4773083 (1988-09-01), Baumbach et al.
patent: 4779054 (1988-10-01), Monteleone et al.
General Electric Company
Hellner Mark
Meise William H.
Tarcza Thomas H.
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