Receiver/timing apparatus for a single frequency, time-shared po

Details Receiver/timing apparatus for a single frequency, time-shared po Receiver/timing apparatus for a single frequency, time-shared po

1976-08-09

1977-12-13

Wilbur, Maynard R.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

178 691, G01S 130

Patent

active

040632440

ABSTRACT:
An improved receiver/timing apparatus is disclosed for use in a single frequency, time-shared, continuous wave, phase-comparison positioning system wherein a trigger signal is transmitted from a master station and wherein pattern frequency signals are transmitted from the master and a plurality of slave stations. The improved receiver/timing apparatus comprises a trigger processor and a timing generator. After acceptable good trigger transmissions have been received for a predetermined number of successive trigger intervals, subsequent trigger transmissions from the master transmitting station are sampled only during a precise interval which is dictated by a timing generator. Also, the timing generator is "locked in" at that time, and spurious electrical transmissions can not reinitialize the timing generator and proper phase comparison is, therefore, maintained. The timing generator also generates precise timing signals, the occurrence of which dictate the intervals during which pattern frequency transmissions from the master and slave stations may be sampled. The improved receiver/timing apparatus further comprises a discriminator which outputs signals to drive pattern digitizer electronics. The phase of each signal which used to drive the pattern digitizer is compared to the phase of the derived IF signal from the respective pattern frequency signal and is corrected if out of phase. Correction of the phase of the signals driving the pattern digitizer is limited by an error excursion limiter. This limiting technique prevents spurious transmissions received during master and slave stations pattern frequency transmission times from adversely affecting the information stored in the pattern digitizer.

REFERENCES:
patent: 3889265 (1975-06-01), Tanaka et al.
patent: 3900876 (1975-08-01), Tsukada et al.
patent: 3936763 (1976-02-01), Palmer

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