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CN-121994186-A - Method, device and system for determining the elevation of a road section used by a vehicle

CN121994186ACN 121994186 ACN121994186 ACN 121994186ACN-121994186-A

Abstract

A method (200) for determining the elevation of a road section used by a vehicle, the method (200) comprising the steps of-detecting (201) signals transmitted by at least two respective ground-based transmitters, the ground-based transceivers being each positioned at a different elevation, -comparing (206) the detected signals to determine the signal with the highest power, -determining (208) the elevation of the road section based on the comparison.

Inventors

  • S. Strunk
  • K.YANG

Assignees

  • 法雷奥舒适驾驶助手公司

Dates

Publication Date
20260508
Application Date
20251106
Priority Date
20241107

Claims (15)

  1. 1. A method (200) for determining the elevation of a road section (2 a, 2 b) used by a vehicle (1), the method (200) comprising the steps of: -detecting (201) signals (21, 31) emitted by at least two respective ground-based transmitters (231, 331), the ground-based transceivers (231, 331) being each positioned at a different height, Comparing (206) the detected signals (21, 31) to determine the signal (21) with the highest power, -Determining (208) an elevation of the road portion (2 a, 2 b) based on the comparison.
  2. 2. The method (200) of claim 1, wherein each detected signal (21, 31) comprises data related to a location of the given ground-based transmitter (231, 331), the determined elevation being further based on the data related to the location.
  3. 3. The method (200) according to claim 2, wherein prior to the comparing step (206), the method (200) comprises a step of selecting (205) the detected signals (21, 31) having at least one common spatial coordinate, the comparing step (206) being performed on the signals (21, 31) selected in the selecting step (205).
  4. 4. A method (200) according to any one of claims 1 to 3, wherein the method (200) further comprises, before the comparing step (206), checking (203) whether each detected signal (21, 31) has a transmission error or a data loss, and selecting a detected signal (21, 31) without a transmission error or a data loss, said comparing step (206) being performed on the signal (21, 31) selected in the selecting step (205).
  5. 5. The method (200) of claim 4, wherein the method (200) further comprises: -recording the unselected signals in a library, and -Discarding (202) the currently received signals each matching one of the signals recorded in the library.
  6. 6. The method (200) according to any one of claims 1 to 6, wherein the elevation of the road section is shared with a network.
  7. 7. The method (200) according to any one of claims 1 to 5, wherein the different foundation transmitters (231, 331) are each comprised in a roadside unit (20, 30).
  8. 8. An apparatus (10) for detecting the elevation of a road section used by a vehicle, the apparatus comprising: -a receiver (130) configured to: i) Signals respectively transmitted by different foundation transmitters (231, 331) are detected, Ii) comparing the detected signals to determine the signal with the highest power, -A controller (13) configured to determine an elevation of the road section based on the comparison.
  9. 9. The apparatus (10) of claim 8, wherein each detected signal includes data related to a location of the given ground-based transmitter (231, 331), the elevation of the road portion further being based on the data related to the location.
  10. 10. The device (10) according to any one of claims 8 or 9, comprising a radio transmitter (131) configured to transmit signals, the transmitter (131) comprising at least one dipole antenna.
  11. 11. The apparatus (10) of claim 10, wherein the at least one dipole antenna is configured to operate, on the one hand, upon reception to receive signals from the ground-based transmitters (231, 331) and, on the other hand, upon transmission to transmit signals transmitted by the transmitter (131) of the apparatus (10).
  12. 12. The apparatus of claim 10 or 11, wherein the at least one half-wavelength dipole antenna has a first dimension that is greater than a second dimension, the first dimension oriented along a vertical direction.
  13. 13. The device (10) according to any one of claims 8 to 12, wherein the device (10) is an on-board device of the vehicle and the ground-based transmitter is a roadside unit (20, 30).
  14. 14. A system (100) for determining an elevation of a roadway for use by a vehicle, the system comprising: at least two foundation transmitters (231, 331), each foundation transmitter (231, 331) being arranged to transmit a signal, -An in-vehicle device (10) according to any one of claims 8 to 13 and comprised in the vehicle.
  15. 15. The system (100) of claim 14, wherein each ground-based transmitter (231, 331) includes at least one dipole antenna having a first dimension higher than a second dimension, the first dimension oriented along a vertical direction, the first dimension being greater than or equal to λ/2, wherein λ corresponds to a wavelength of an operating frequency of the at least one antenna.

Description

Method, device and system for determining the elevation of a road section used by a vehicle Technical Field The present invention relates to a method for determining the height of a road section used by a vehicle. The invention also relates to a device and a system for determining the elevation of a road section used by a vehicle. Background Methods for determining the elevation of a road section on which a vehicle is traveling are known. These methods typically use signals received by a receiver from satellites in a satellite positioning system to determine the location of a road portion and then use data from a map to determine the altitude associated with the road portion. These methods work well but they do not work well when the vehicle is traveling under a bridge or on the floor of a multi-layer roadway. Thus, these methods are inaccurate. Furthermore, these methods use several data and measurements from additional sensors, and thus may require additional costs and are not easy to implement. The present invention aims to remedy at least one of the above-mentioned drawbacks. Disclosure of Invention In an embodiment, the present invention provides a method for determining the elevation of a road section used by a vehicle, the method comprising the steps of: detecting signals emitted by at least two respective ground-based transmitters, each located at a different elevation, Compares the detected signals to determine the signal with the highest power, -Determining an elevation of the road section based on the comparison. By using the signal with the highest power, it is possible to distinguish between different situations (e.g. evaluating whether the vehicle is traveling under a bridge or at the bottom of a multi-road deck) and to determine the elevation of the road section used by the vehicle. Thus, the method according to the invention is easy to implement and requires no additional costs. Furthermore, it allows easy determination of the road portion where the vehicle is traveling in the multilayer road. According to one embodiment, each detected signal includes data related to the location of a given ground-based transmitter, and the determined elevation is further based on the data related to that location. Thus, the elevation may be determined (in practice) by using the data recorded in the signal with the highest power. Thus, the method is easy to implement and does not require much processing to determine the elevation of the road section used by the vehicle. According to this embodiment, before the comparing step, the method may comprise the step of selecting a detected signal having at least one, preferably two, common spatial coordinates, said comparing step being performed on the signal selected in the selecting step. According to one embodiment the method further comprises checking each detected signal for transmission errors and/or data loss and selecting a detected signal without transmission errors or data loss before the comparing step, said comparing step being performed on the signal selected in the selecting step. According to this embodiment, the method may further comprise: -recording the unselected signals in a library, and -Discarding each currently received signal matching one of the signals recorded in the library. According to one embodiment, the elevation of the road section is shared with the network. According to an embodiment, the different foundation transmitters are each comprised in a road side unit and/or the device is an in-vehicle device. According to an embodiment, the different foundation transmitters are each comprised in an in-vehicle device and/or the apparatus is a roadside unit. Another object of the present invention is to provide an apparatus for detecting the elevation of a road section used by a vehicle, the apparatus comprising: -a receiver configured to: i) Signals respectively transmitted by different ground-based transmitters are detected, Ii) comparing the detected signals to determine the signal with the highest power, -A controller configured to determine an elevation of the road section based on the comparison. According to an embodiment, each detected signal comprises data of a position relative to the given ground-based transmitter, the elevation of the road portion being further based on the data relative to the position. According to one embodiment, the apparatus comprises a radio transmitter configured to transmit signals, said transmitter comprising at least one dipole antenna. According to this embodiment, the at least one dipole antenna may be configured to operate, on the one hand, upon reception to receive signals from the ground-based transmitter and, on the other hand, upon transmission to transmit signals transmitted by the transmitter of the device. According to one embodiment, the at least one half-wave dipole antenna has a first dimension that is larger than a second dimension, the first dimension being oriented along a vertical direc