Initial acquisition signal detection system for TDMA satellite c

Details Initial acquisition signal detection system for TDMA satellite c Initial acquisition signal detection system for TDMA satellite c

1977-11-08

1979-09-18

Safourek, Benedict V.

Telegraphy

Systems

Line-clearing and circuit maintenance

179 15BS, H04L 710

Patent

active

041683986

ABSTRACT:
A low level initial acquisition signal consisting of a continuous wave signal portion followed by a phase-modulated signal portion is transmitted via a satellite to a receiving station. The received CW signal is converted by a voltage-controlled variable frequency local oscillator to an intermediate frequency signal which is fed to a narrow passband filter. The local oscillator frequency is linearly swept, and the maximum signal passing through the filter during one sweep is detected. The local oscillator is then locked at the local frequency which produced the maximum signal, thereby effecting frequency acquisition. Next, the phase-modulated signal portion is multiplied by a phase-modulated signal output from a variable phase local signal generator. The phase of the local generator is also swept, and the maximum phase correlation signal passing through the band pass filter is again detected, and the phase of the generator output is corrected by the phase shift which produced the maximum phase correlation signal. This phase shift is used as a basis for determining the proper timing for acquisition of the correct time slot in the TDMA frame at the satellite for a transmitted data burst. The acquisition is confirmed by comparing the maximum phase correlation signal obtained during phase sweeping with the signal level obtained after the phase of the generator has been locked.

REFERENCES:
patent: 3909541 (1975-09-01), Boblin
patent: 3974333 (1976-08-01), May, Jr. et al.

Affiliated with

Also associated with

Rating

Initial acquisition signal detection system for TDMA satellite c does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Initial acquisition signal detection system for TDMA satellite c, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Initial acquisition signal detection system for TDMA satellite c will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-898657