Communications: directive radio wave systems and devices (e.g. – Return signal controls external device – Radar mounted on and controls land vehicle
Patent
1993-12-16
1995-06-13
Hellner, Mark
Communications: directive radio wave systems and devices (e.g.,
Return signal controls external device
Radar mounted on and controls land vehicle
342125, 342146, G01S 1391
Patent
active
054247470
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a process and a system for determining the position and orientation of a vehicle, as well as to applications especially in the automobile sector.
In the particular automobile sector, and more precisely in the context of studies of anti-collision systems for vehicles, the detection of vehicles by conventional radar techniques represents a sizable effort. Indeed, the studies conducted are confronted with the fact that the vehicle to be detected is firstly uncooperative, and moreover sends back information which may be drowned in ground clutter. The level of ground clutter is very strongly linked to the environment (bridges, metal panels, tunnels, bends, etc.), and induces a very sizable false alarm rate at detector radars. It is then necessary to employ complex radar processing to obtain the kinematics of a scene.
Furthermore, it may be extremely important to ascertain the orientation or course followed by a vehicle consider in fact the situation in which one car is following another, the first entering a bend but still being within the field of visibility of the second car. It is readily understood that the danger which exists for the second car differs depending on whether the first car has a course which allows it to take the bend normally or else, on the contrary, a course which represents a loss of line.
Thus, a first objective of the invention is to propose a process making it possible to give both the position and orientation of a mobile, without requiring complex processing.
A second objective of the invention is to render the vehicle cooperative so as to facilitate detection thereof.
A third objective of the invention is to minimize to the maximum the contribution from ground clutter due to the environment of the vehicle.
More precisely, the invention relates to a process for determining the position and orientation of a vehicle, characterized in that it consists in: processing, an interrogation signal with a given frequency f; modulating said interrogation signal received by the vehicle respectively by a modulating frequency F.sub.1 and by a modulating frequency F.sub.2 which differs from F.sub.1, the two response signals being retransmitted according to two respective transmission patterns D.sub.1 and D.sub.2 which differ in aim relative to one another by an angle .alpha., and each relative to the direction of orientation (YY') of the mobile by an angle .gamma..sub.1 and .gamma..sub.2 respectively, at least two of the three angles .alpha., .gamma..sub.1 and .gamma..sub.2 being supplied to the radar; of the two response signals and deducing therefrom the angular position .phi. of the vehicle relative to the radar; on one of the reception channels; patterns D.sub.1 and D.sub.2, the orientation .theta. of the vehicle relative to the radar.
We shall see that the radar which emits the interrogation signal may be stationary or vehicle, thus enabling the process to be applied to a good number of applications in the automobile sector (anti-collision, control of road traffic and of compliance with the highway code).
Lastly, we shall see that the system according to the invention is addressed at the progressive integration of novel means allowing other applications (automatic toll points, etc.), without calling the basis system into question.
Other advantages will emerge in the light of the following description, given with reference to the attached figures:
FIG. 1 illustrates part of a system implementing the process for computing the position and orientation of a mobile according to the invention;
FIG. 2 shows an example of the signals received by the interrogator radar, in accordance with the process of the invention;
FIGS. 3a and 3b are two illustrative embodiments of a device 1 of FIG. 1;
FIG. 4 is one possible illustrative embodiment of an interrogator radar according to the invention;
FIG. 5 shows a possible enhancement of the device 1 of FIG. 3a;
FIG. 6 is a first application of the process according to the invention to a system for controlling and regulating road tr
REFERENCES:
patent: 4148028 (1979-04-01), Fuliki
patent: 4308536 (1981-12-01), Sims, Jr. et al.
patent: 4464662 (1984-08-01), Tomasi
patent: 4818999 (1989-04-01), Kobayashi et al.
patent: 5045859 (1991-09-01), Yetter
patent: 5233353 (1993-08-01), Guena et al.
"New Automatic Vehicle Identification System for Detection of Traffic Without Lane Discipline", Electronics & Communication Engineering Journal, by Manh Anh Do and Jin Teong Ong, pp. 99-107, Jun. 1991.
Chazelas Jean
Souchay Philippe
"Thomson-CSF"
Hellner Mark
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