Pulse or digital communications – Synchronizers – Frequency or phase control using synchronizing signal
Patent
1994-03-23
1996-02-27
Chin, Stephen
Pulse or digital communications
Synchronizers
Frequency or phase control using synchronizing signal
375208, 370107, H04L 700, H04J 306, H04B 1707
Patent
active
054955092
ABSTRACT:
Apparatus for rapidly acquiring a high performance gain long PN code having a preamble header in real time includes appratus for rapid acquiring and tracking a short PN code in said preamble header and further includes apparatus for demodulating and tracking a long PN code which follows said preamble header. After acquiring the short PN code, the short PN replica code is applied to the long code demodulation and tracking apparatus. The short PN code is employed to synchronize the long code demodulation and tracking apparatus by detecting the time of occurrence of a sync word in said preamble header and is employed to generate a switch point signal and switch from a short PN replica code to a long PN replica code at the input to the long code demodulation and tracking device in real time.
REFERENCES:
patent: 4291409 (1981-09-01), Weinberg et al.
patent: 4638494 (1987-01-01), Kartchner et al.
patent: 4701939 (1987-10-01), Stutt et al.
patent: 5315616 (1994-05-01), DeLisle et al.
patent: 5414730 (1995-05-01), Lundquist et al.
"PA-100 Preliminary Product Information", Paramax Systems Corp. (date must be at the latest Feb. 1993, as the section on the Evaluation Board is dated Feb. 25, 1993).
Kingston Samuel C.
Lundquist Alan E.
Zscheile, Jr. John W.
Bowen Glenn W.
Chin Stephen
Gluck Jeffrey W.
Loral Corporation
Sowell John B.
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