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 making it possible to reconstruct a first signal taking the form of a series of pulses of width T, wherein said first signal is derived from a revolving beacon and takes the form of a sinusoidal signal.
- said first signal to be reconstructed is filtered in a first filter (16) at a frequency F1 and in a second filter (17) at a frequency F2, the signal SF1 obtained from the first filter (16) and the signal SF2 obtained from the second filter (17) are transmitted to a summing device (18) then to a device (20) that introduces a delay value τ, and in that
- one or more stages of width T of said first signal to be reconstructed are replaced by a second sinusoidal signal and delayed by adding the delay τ to said first signal, by portions of sinusoid of the second delayed sinusoidal signal corresponding to an instant t−1 in order to reconstruct a signal having a sinusoidal shape.
A device making it possible to reconstruct the envelope of a first signal having a sinusoidal shape and obtained from a revolving beacon, wherein it comprises at least the following items:
- a pulse detector (10) linked to a decoding device (11) after which a first signal takes the form of “stages” of time width T, a device for reconstructing the present using the past (15) comprising at least one low-pass filter (16) at a first frequency F1 and a bandpass filter (17) at a second frequency F2, a device (20) adding a delay τ of a given value to the signal obtained from the filter in the form of a sinusoid, the device for reconstructing the present using the past (15) replacing one or more stages of said first signal to be reconstructed received at an instant t, a portion of sinusoid of the signal delayed by the delay τ of sinusoidal type, the replacement sinusoid portion having a time duration substantially equal to the value T of the replaced porch.
Dependencies are inferred from the claim text.