METHOD AND DEVICE FOR ULTRASOUND MEASUREMENT OF THE SPEED OF A VEHICLE IN RELATION TO THE GROUND

Abstract

Abstract Translated from French CE DISPOSITIF COMPREND UN GENERATEUR DE SIGNAL A FREQUENCE ULTRASONIQUE, DES MOYENS 6, 4 D'EMISSION D'UN SIGNAL ULTRASONIQUE VERS LE SOL, DES MOYENS DE RECEPTION 5 ET D'AMPLIFICATION 7 DU SIGNAL REFLECHI DU SOL VERS LE VEHICULE, DES MOYENS DE DETECTION 3 ENGENDRANT UN SIGNAL PRODUIT DU SIGNAL EMIS PAR LE SIGNAL RECU, ET DES MOYENS DE FILTRAGE 8 POUR EXTRAIRE UN SIGNAL DOPPLER DU SIGNAL PRODUIT. LE DISPOSITIF COMPREND EN OUTRE UN CAPTEUR DE TEMPERATURE DE L'AIR AMBIANT 11 CONNECTE A UN CIRCUIT LOGIQUE DE TRAITEMENT 1 COMPORTANT UN MICROPROCESSEUR 13 ASSURANT UN FILTRAGE MEDIAN, UNE MOYENNE EXPONENTIELLE ET UNE CORRECTION EN TEMPERATURE DU SIGNAL DOPPLER. APPLICATION AUX TRACTEURS AGRICOLES. THIS DEVICE INCLUDES AN ULTRASONIC FREQUENCY SIGNAL GENERATOR, MEANS 6, 4 FOR SENDING AN ULTRASONIC SIGNAL TOWARDS THE GROUND, MEANS OF RECEPTION 5 AND AMPLIFICATION 7 OF THE SIGNAL REFLECTED FROM THE GROUND TO THE VEHICLE, MEANS OF DETECTION 3 GENERATING A SIGNAL PRODUCED FROM THE SIGNAL EMITTED BY THE SIGNAL RECEIVED, AND FILTERING MEANS 8 TO EXTRACT A DOPPLER SIGNAL FROM THE SIGNAL PRODUCED. THE DEVICE FURTHER INCLUDES AN AMBIENT AIR TEMPERATURE SENSOR 11 CONNECTED TO A PROCESSING LOGIC CIRCUIT 1 INCLUDING A MICROPROCESSOR 13 PROVIDING MEDIAN FILTERING, EXPONENTIAL AVERAGE AND TEMPERATURE CORRECTION OF THE DOPPLER SIGNAL. APPLICATION TO AGRICULTURAL TRACTORS.

Inventors

• 👤 Yves Drutel
• 👤 Gerard Joyez
• 👤 Andre Thevenin
• 👤 Georges Huddlestone

Bibliographic Details