Process and system for determining the position and orientation of a vehicle, and applications
First Claim
1. Process for determining the position and orientation of a vehicle, comprising the steps of:
- transmitting, from a radar containing two channels for reception and for processing, an interrogation signal with a given frequency f;
retransmitting, from said vehicle, at least two response signals formed by modulating said interrogation signal received by the vehicle respectively by a modulating frequency F1 and by a modulating frequency F2 which differs from F1, the two response signals being retransmitted according to two respective transmission patterns D1 and D2 which differ in aim relative to one another by an angle α
, and each relative to the direction of orientation YY'"'"' of the vehicle by an angle γ
1 and γ
2 respectively, at least two of the three angles α
, γ
1 and γ
2 being supplied to the radar;
measuring, from the reception channels, the angular deviation of either of the two response signals and deducing therefrom the angular position φ
of the vehicle relative to the radar;
measuring the ratio of the amplitudes of the two response signals received on one of the reception channels;
deducing therefrom, based on the angles supplied and on the shape of the patterns D1 and D2, the orientation e of the vehicle relative to the radar.
1 Assignment
0 Petitions
Accused Products
Abstract
The present invention relates to a process and a system for determining the position and orientation of a mobile, and to applications thereof.
In order to ascertain both the position and orientation of a mobile, the invention proposes an interrogation/response process whose particular feature is to supply, to a given interrogation, two responses which are distinguished on the one hand, by different modulating frequencies and, on the other hand, by the fact that they are transmitted according to two patterns which differ in aim relative to one another. It is then possible, simply by measuring the angular deviation of either one of the two responses, and simply by measuring the ratio of the amplitudes of the two responses received, to deduce on the one hand the angular position φ and on the other hand the orientation θ of the mobile.
The applications in the automobile sector are numerous (anticollision, control of road traffic and of compliance with the highway code, automatic toll points, etc.).
-
Citations
16 Claims
-
1. Process for determining the position and orientation of a vehicle, comprising the steps of:
-
transmitting, from a radar containing two channels for reception and for processing, an interrogation signal with a given frequency f; retransmitting, from said vehicle, at least two response signals formed by modulating said interrogation signal received by the vehicle respectively by a modulating frequency F1 and by a modulating frequency F2 which differs from F1, the two response signals being retransmitted according to two respective transmission patterns D1 and D2 which differ in aim relative to one another by an angle α
, and each relative to the direction of orientation YY'"'"' of the vehicle by an angle γ
1 and γ
2 respectively, at least two of the three angles α
, γ
1 and γ
2 being supplied to the radar;measuring, from the reception channels, the angular deviation of either of the two response signals and deducing therefrom the angular position φ
of the vehicle relative to the radar;measuring the ratio of the amplitudes of the two response signals received on one of the reception channels; deducing therefrom, based on the angles supplied and on the shape of the patterns D1 and D2, the orientation e of the vehicle relative to the radar. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. System for determining the position and orientation of a vehicle comprising:
-
a radar employing two channels for reception and for processing, called the sum channel and difference channel, and means for emitting an interrogation signal at a given frequency f; at least one first and one second device, which are placed on said vehicle, each including means for modulating the received interrogation signal by a modulating frequency F1 for the first device, and F2 which differs from F1 for the second device, and means for transmitting the modulated signal as response signal, the two response signals leaving the first and the second devices being transmitted according to two respective transmission patterns D1 and D2 which differ in aim relative to one another by an angle α
, and each relative to the direction or orientation YY'"'"' of the vehicle by an angle γ
1 and γ
2 respectively;means for measuring, from the two channels, the angular deviation of either of the two response signals in order to deduce therefrom the angular position φ
of the vehicle relative to the radar;means for computing the ratio of the amplitudes of the two response signals received on the sum channel; a module for determining the orientation θ
of the vehicle based on computing said ratio. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
-
Specification