Adaptive filter for aircraft navigation receiver

Details Adaptive filter for aircraft navigation receiver Adaptive filter for aircraft navigation receiver

1985-02-12

1987-03-31

Chin, Gary

Boots, shoes, and leggings

364517, 343401, 375103, G06F 1520, G01S 144

Patent

active

046548114

ABSTRACT:
A low-pass filter for digital bearing data from an aircraft navigation receiver in which the filter time constant is set to a high value when the receiver bearing data exhibits characteristics of a noisy signal received from a distant station where the bearing from the aircraft to the station can change only at a slow rate and in which the filter time constant is set to lower values for less filter delay when the receiver bearing data exhibits characteristics of a less noisy signal received from a nearer station where the bearing from the aircraft to the station can change at a higher rate. Receiver bearing data for a current sampling interval is compared to filtered bearing data for a previous sampling interval to determine change in magnitude of the difference. Such difference for a current sampling interval is compared with a similar difference for a previous sampling interval for change in algebraic sign. Filter time constant is set to higher values when difference magnitudes are small and sign changes are frequent and is set to lower values when difference magnitudes are larger and sign changes are infrequent.

REFERENCES:
patent: 3648031 (1972-03-01), Neal
patent: 3778602 (1973-12-01), Schmitt
patent: 3792473 (1974-02-01), Sawicki
patent: 3908115 (1975-09-01), Waggener
patent: 4121287 (1978-10-01), Leal et al.
patent: 4590579 (1986-05-01), Erb

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