Self learning monitor for VLF wave propagation

Details Self learning monitor for VLF wave propagation Self learning monitor for VLF wave propagation

1976-06-14

1977-07-26

Ruggiero, Joseph F.

Registers

Transfer mechanism

Traveling pawl

23515113, 343 5DP, 343 177, G01S 744, G06F 1550

Patent

active

040385299

ABSTRACT:
A monitor for notifying a vehicle using VLF navigation of an abnormal conion of VLF wave propagation. Sensing means, including an antenna, oscillator, IF mixer, and phase tracker is provided to periodically sense changes in the phase angle of a VLF wave received by the monitor, and to couple a succession of values of an updating quantity into a data processing means, each value corresponding to a sensed amount of phase change. The data processing means learns what comprises a normal condition of VLF wave propagation by averaging successive values of the updating quantity, and provides notice of an abnormal condition whenever a received value of the updating quantity varies from the previously computed average by an amount in excess of a preselected criterion.

REFERENCES:
patent: 2767914 (1956-10-01), Merrill et al.
patent: 3151237 (1964-09-01), Hrabak
patent: 3464549 (1969-09-01), Armbruster
patent: 3549875 (1970-12-01), Goldman et al.
patent: 3936828 (1976-02-01), Muesse et al.

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