Measuring device for a motor vehicle

Details Measuring device for a motor vehicle Measuring device for a motor vehicle

G - Physics

01

S

G01S 13/34 (2006.01) G01S 13/93 (2006.01)

Patent

CA 2541242

The invention relates to a measuring device (10, 11, 12, 13, 14, 15, 16, 30, 50), particularly a measuring device (10, 11, 12, 13, 14, 15, 16, 30, 50) for a motor vehicle (1), for measuring a distance between said measuring device (10, 11, 12, 13, 14, 15, 16, 30, 50) and at least one object (20) and/or measuring a difference in speed (v) between the measuring device (10, 11, 12, 13, 14, 15, 16, 30, 50) and the at least one object (20). The inventive measuring device (10, 11, 12, 13, 14, 15, 16, 30, 50) comprises an emitting apparatus (35, 55) for transmitting a transmission signal (s(t), sl(t)) encompassing at least two sequences of signal portions (A(t), B(t), C(t), D(t)), a first sequence of signal portions (A(t)) and a second sequence of signal portions (B(t)) with two respective temporally alternating signal portions (A1, A2, A3, B1, B2, B3). The frequency of at least two signal portions (A1, A2, A3, B1, B2, B3) of a sequence of signal portions (A(t), B(t), C(t), D(t)) differs by one respective difference frequency (fHub,A/(N- 1), fHub,B/(N-1)), the difference frequency (fHub,A/(N-1)) of the first sequence of signal portions (A(t)) being different from the difference frequency (fHub,B/(N-1)) of the second sequence of signal portions (B(t)).

L'invention concerne un dispositif de mesure (10, 11, 12, 13, 14, 15, 16, 30, 50), destiné en particulier à un véhicule automobile (1) et servant à mesurer la distance séparant ce dispositif de mesure (10, 11, 12, 13, 14, 15, 16, 30, 50) d'au moins un objet (20) et/ou à mesurer une différence de vitesse (v) entre ce dispositif de mesure (10, 11, 12, 13, 14, 15, 16, 30, 50) et l'objet ou les objets (20). Ce dispositif de mesure (10, 11, 12, 13, 14, 15, 16, 30, 50) comporte au moins un dispositif rayonnant (35, 55) qui émet un signal d'émission (s(t), sl(t)) comprenant au moins deux séries de parties de signal (A(t), B(t), C(t), D(t)), à savoir une première série de parties de signal (A(t)) et une seconde série de parties de signal (B(t)) présentant chacune deux parties de signal (A1, A2, A3, Bl, B2, B3) qui alternent dans le temps. Au moins deux parties de signal (A1, A2, A3, Bl, B2, B3) d'une série de parties de signal (A(t), B(t), C(t), D(t)) se différencient par une fréquence différentielle (f¿Hub,A?/(N-1), f¿Hub,B?/(N-1)), la fréquence différentielle (f¿Hub,A?/(N-1)) de la première série de parties de signal (A(t)) étant différente de la fréquence différentielle (f¿Hub,B?/(N-1)) de la seconde série de parties de signal (B(t)).

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