Method of and apparatus for reducing cycle slippage errors in Lo

Details Method of and apparatus for reducing cycle slippage errors in Lo Method of and apparatus for reducing cycle slippage errors in Lo

1985-06-24

1988-05-10

Blum, Theodore M.

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

Directive

Beacon or receiver

342389, G01S 124

Patent

active

047439122

ABSTRACT:
Method and apparatus of obviating cycle-locking slippage errors in reception of Loran-C and similar radio-frequency signals covered by receiver location acceleration effects and other distortion effects simulating the same, that comprises, receiving the radio-frequency signals and producing data by sampling and tracking the cycles of the signal with a time-constant filter sufficiently fast to accommodate for the largest acceleration to be experienced by the receiver location to avoid cycle slippage in locating a predetermined cycle zero crossing, and independently post-filtering sufficiently slowly to smooth the data and without interaction with said sampling.

REFERENCES:
patent: 3044064 (1962-07-01), Durbin
patent: 3685052 (1972-08-01), Van Etten
patent: 3736590 (1973-05-01), Lipsey et al.
patent: 3774210 (1973-11-01), Mollod et al.
patent: 3786334 (1974-01-01), Johannessen
patent: 3921076 (1975-11-01), Currie
patent: 4151528 (1979-04-01), Johannessen
patent: 4224623 (1980-09-01), Mercer et al.
patent: 4392138 (1983-07-01), Jasper et al.
patent: 4416017 (1983-11-01), Jasper et al.
patent: 4445223 (1984-04-01), Jasper et al.
patent: 4482896 (1984-11-01), Menick
patent: 4595927 (1986-06-01), Menick
T. R. Benedict and G. W. Bordner, "Synthesis of an Optimal Set of Radar Track-While-Scan Smoothing Equations", Jul. 1962, pp. 27-32.
Donald A. Feldman, "An Atmospheric Noise Model with Application to Low Frequency Navigation Systems", Jun. 1972, pp. 1-205.

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