Motorola Corporation

Dean J Boman

Lansing M Carson

A transponder demodulates a phase modulated ranging signal transmitted by an earth station. The transponder converts the analog ranging signal to digital form. The digital ranging signal is demodulated into its I and Q phase components. Next the demodulated ranging signal is re-modulated and digitally combined with a selected transmit frequency. Then the re-modulated ranging signal is converted from digital to analog form. The ranging signal is transmitted to the earth station.

Digital range turn-around for tracking, telemetry and control transponder

A method and apparatus for generating two phase-coherent first and second signals with arbitrary frequency ratio includes programming a first numerically controlled oscillator (NCO) with a first frequency word to produce a first NCO output. The first NCO output is processed to produce the first signal. The first frequency word is multiplied in a multiplier to produce a second frequency word which is corrected in phase relative to the first frequency word. A second NCO is programmed with the corrected second frequency word to produce a second NCO output. The second NCO output is processed to produce the second signal.

Growing community of inventors

Chandler, AZ, United States of America

Dean J Boman