Communications: directive radio wave systems and devices (e.g. – Directive – Beacon or receiver
Patent
1990-03-06
1991-03-12
Issuing, Gregory C.
Communications: directive radio wave systems and devices (e.g.,
Directive
Beacon or receiver
G01S 124
Patent
active
049996380
ABSTRACT:
Radio signals containing Loran C pulses from stations from a desired chain are amplified, filtered and ensembled averaged in an acquisition memory which is accessible by a controlling microprocessor. By staggering the ensemble averaging of the first four pulses in a station pulse group in time with respect to the last four pulses of the same pulse group, cross correlating the composite pulses formed by averaging the first four and last four pulses of the station pulse group with the help of the microprocessor provides time skew information which is used to adjust the receiver's master clock to align it with the clock of the transmitter. By varying the amount of time stagger, an ever finer resolution adjustment range is achieved. When the staggered averaging cycle times would exceed the time between successive ensemble averaging cycles without stagger, then successive ensemble averaging cycle time is employed for master clock adjustment. Cross correlation of the composite pulse formed by averaging the eight pulses gathered during the most recent unstaggered averaging cycle with the composite pulse averaged from the eight pulses of the previous average cycle can then be used to yield clock skew information. As the receiver clock becomes more closely aligned to the transmitter clock, the ensemble averaging process improves.
REFERENCES:
patent: 3947849 (1976-03-01), Fehlner et al.
patent: 4166275 (1979-08-01), Michaels et al.
patent: 4468668 (1984-08-01), Brodeur
patent: 4594594 (1986-06-01), Fukuhara
patent: 4814771 (1989-03-01), Bahr et al.
patent: 4875019 (1989-10-01), Monson et al.
Final Project Report-Study of Methods for Synchronizing Remotely-Located Clocks, Sperry Report No. HG-9224-0234, Sep. 1966, p. 90.
L. Dennis Shapiro, "Time Synchronization from Loran-C", IEEE Spectrum, Aug. 1968, pp. 46, 50-51.
Dwaine Marshall, "Wild Goose Paper: Digital Averaging Loran Receiver," Megapulse, Inc., Oct 1987, This paper was presented at the Technical Symposium on the Annual Conference of the Wild Goose Association of Rockville, Maryland, and is believed to have been distributed on Oct. 22, 1987.
Issuing Gregory C.
LocUS, Inc.
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