G - Physics – 01 – S
Patent
G - Physics
01
S
343/105
G01S 1/44 (2006.01) H03H 21/00 (2006.01)
Patent
CA 1240775
Abstract of the Disclosure 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.
489023
Allied Corporation
Macrae & Co.
LandOfFree
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