Method and device for determining the angle of bearing in a TACAN type radionavigation system
AssigneeThales
InventorJulien Colle
Life of this patent
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Abstract
Method making it possible to reconstruct a first signal taking the form of a series of pulses of width T, characterized in that it comprises a step in which a delay τ fixed with respect to the first signal to be reconstructed is introduced into a second signal having a sinusoidal shape and in that the porches of width T of the first signal at an instant t are substituted with portions of sinusoid of the second delayed sinusoidal signal corresponding to an instant t−1 so as to reconstruct a signal having a sinusoidal shape.
Claims7
A method to reconstruct a first signal taking the form of a series of pulses of width T, said first signal derived from a revolving beacon and taking the form of a sinusoidal signal, wherein:
- said first signal to be reconstructed is filtered in a first filter at a frequency F1 and in a second filter at a frequency F2, a signal SF1 obtained from the first filter and a signal SF2 obtained from the second filter being transmitted to a summing device and then to a device that introduces a delay value τ to generate a delayed second signal, and wherein:
- one or more stages of width T of said first signal to be reconstructed are replaced by sinusoidal portions of the delayed second signal corresponding to an instant t−1 in order to reconstruct a signal having a sinusoidal shape.
A device to reconstruct an envelope of a first signal having a sinusoidal shape and obtained from a revolving beacon, the device comprising:
- a pulse detector linked to a decoding device after which a first signal takes a form of stages of time width T,
- a reconstructing device comprising at least one low-pass filter at a first frequency and a bandpass filter at a second frequency,
- a delay device for adding a delay τ of a given value to a sinusoidal signal obtained from the low-pass filter and the bandpass filter, the reconstructing device replacing one or more stages of said first signal received at an instant t with a replacement sinusoidal portion of a sinusoidal signal received from the delay device delayed by the delay τ, the replacement sinusoidal portion having a time duration substantially equal to the time width T of the replaced stages.
Dependencies are inferred from the claim text.