Pulse or digital communications – Repeaters – Testing
Patent
1985-11-06
1987-01-27
Griffin, Robert L.
Pulse or digital communications
Repeaters
Testing
455126, 332 18, 332 37D, 330149, H04L 2549
Patent
active
046399380
ABSTRACT:
An RF pulse transmitter, for use in precision distance measuring equipment (DME/P) of a microwave landing system, includes appropriate circuitry to correct for incidental phase modulation (IPM). The pulse transmitter includes a modulation circuit for generating an RF pulse having a pulse peak. A reference phase control circuit is provided to generate a reference signal. A phase detector receives the RF pulse and the reference signal and in response thereto generates a phase error signal. The reference phase control circuit includes appropriate circuitry for adjusting the phase of the reference signal applied to the phase detector to thereby drive the phase error signal to a predetermined value at the pulse peak. A pre-distortion circuit generates a pre-modeled correction signal pulse for use in correcting for incidental phase modulation (IPM). A phase correction control circuit receives the phase error signal and in response thereto modulates the phase of the carrier signal to correct for the incidental phase modulation.
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Crowder, Jr. Albert M.
E-Systems Inc.
Glenny Raymond C.
Griffin Robert L.
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