Processing an encoded marker

Details Processing an encoded marker Processing an encoded marker

1996-11-20

1999-02-02

Blum, Theodore M.

Communications: directive radio wave systems and devices (e.g.,

Directive

Beacon or receiver

G01S 502, G01S 352

Patent

active

058671242

ABSTRACT:
An encoded marker is transmitted as a paging signal for mobile satellite telephones. The signal is susceptible to Doppler effects, and the processing procedures are arranged to determine the Doppler characteristics of subsequent signals. The marker takes the form of a first frequency sweep occurring in a first direction followed by a second frequency sweep occurring in the opposite direction. The markers are correlated against sweep signatures to produce amplitude peaks. The mid-point between the peaks and the spacing between the peaks allows timing offsets and frequency shifts to be accurately calculated, thereby facilitating the processing of subsequent data signals.

REFERENCES:
patent: 5212489 (1993-05-01), Nelson
patent: 5257257 (1993-10-01), Chen et al.
patent: 5566168 (1996-10-01), Dent

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