Pulsed, pseudo random position fixing radio navigation method an

Communications: radio wave antennas – Antennas – Balanced doublet - centerfed

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364452, 455 65, 343378, G01S 124

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active

044234198

ABSTRACT:
This disclosure is concerned with a technique and apparatus for reducing CW and other inband interference in a broad bandwidth RF pulse navigation system to inobtrusive noise through the use of pulse-position random modulation, including, where desired, superimposed random phase modulation, with signal-random modulation code cross-correlation in reception.

REFERENCES:
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patent: 3882504 (1975-05-01), Currie et al.
patent: 3889263 (1975-06-01), Johannessen
patent: 3921076 (1975-11-01), Currie
patent: 4104635 (1978-08-01), Brodeur
patent: 4150380 (1979-04-01), Brodeur
patent: 4151528 (1979-04-01), Johannessen
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patent: 4291410 (1981-09-01), Caples et al.
patent: 4334314 (1982-06-01), Nard et al.
R. C. Dixon, Spread Spectrum Systems, John Wiley and Sons, 1976, pp. 61-64, 85-91.
Megapulse Inc., "Accufix Instruction Manual", Bedford, Massachusetts, 1973-1974, pp. 2-57 to 2-62, 2-82 to 2-101.

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