Communications: directive radio wave systems and devices (e.g. – With particular circuit – For pulse modulation
Patent
1993-04-28
1994-06-28
Hellner, Mark
Communications: directive radio wave systems and devices (e.g.,
With particular circuit
For pulse modulation
G01S 1300
Patent
active
053250990
ABSTRACT:
A modular solid-state radar transmitter apparatus for producing waveforms whose amplitude may be varied over time. The transmitter achieves pulse modulation on either an intrapulse or pulse to pulse basis, while at the same time reducing stress on individual solid-state modules. Intrapulse modulation and pulse to pulse modulation can be produced with the disclosed modular solid-state transmitter because the number of modules and the sequence in which they are activated is selectable. These selections provide the various desired levels of transmitted power and thus effectively achieve modulation. In order to achieve this intrapulse modulation, a variable combiner is introduced whose coupling factor is coordinated with the module activations. In one embodiment, variable combining is accomplished by the use of RF switching logic for combining pairs of signals in parallel. In this case, RF switches are programmed to act as a conventional combiner when all modules are active. When a module is deactivated, the switches are set so that the active modules are connected to the output or the next stage of combining. Another embodiment uses a series approach to accomplish such variable combining. Here, when all modules are active RF switches and phase shifters are programmed for performance as in a conventional combiner. When a module is deactivated, the phase of the signals within each coupler section is adjusted by means of RF amplifier programming and phase shifters to avoid loss in the termination.
REFERENCES:
patent: 4827267 (1989-05-01), Shearin
patent: 5146616 (1992-09-01), Tang et al.
Weil, "Efficient Spectrum Control for Pulsed Radar Transmitter", chp. 27 of Radar Technology, pp. 379-383, edited by Brokner.
J. R. Frost, "Phased Arrays", chp. 2 of Radar Technology, pp. 63-69, edited by Scanlan.
Milan John M.
Nemit Jeffrey T.
Okamura Arthur Y.
Hellner Mark
ITT Corporation
Peterson Thomas L.
Plevy Arthur L.
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