Method and device for measuring the speed of a moving object

Details Method and device for measuring the speed of a moving object Method and device for measuring the speed of a moving object

G - Physics

01

S

G01S 13/60 (2006.01) G01S 13/34 (2006.01) G01S 13/88 (2006.01)

Patent

CA 2194367

The speed of a moving object (1) relative to the ground (2) may be measured with a wide beam Doppler radar (3) on board the moving object by transmitting two closely spaced incident radar waves at the ground and collecting the corresponding reflected waves, at least the first incident wave having a frequency that is variable over time, multiplying signals representing the first incident and reflected waves, determining a spectrum of the low frequency component of the product of the two signals, processing the second incident and reflected waves in the same way, then finding two peaks on said spectra that match with a certain frequency shift, and determining the speed of the moving object from the frequencies of these two significant points and the height of the radar above the ground.

Pour mesurer la vitesse d'un mobile (1) par rapport au sol (2) au moyen d'un radar Doppler (3) à large faisceau fixé au mobile, on émet successivement à des instants rapprochés deux ondes radar incidentes vers le sol et on collecte les ondes réfléchies correspondantes, au moins la première onde incidente ayant une fréquence variable au cours du temps, on multiplie des signaux représentatifs des premières ondes incidentes et réfléchies, on détermine un spectre de la composante de basse fréquence du produit de ces deux signaux, on effectue les mêmes opérations pour les deuxièmes ondes incidentes et réfléchies, puis on repère sur les deux spectres deux pics qui se correspondent avec un certain décalage en fréquence, et on détermine la vitesse du mobile en fonction des fréquence de ces deux points singuliers et en fonction de la hauteur du radar par rapport au sol.

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