Event detection system and method for vehicle

Patent metadata

Field	Value
Publication number	US-10845455-B2
Application number	US-201816179187-A
Country	US
Kind code	B2
Filing date	Nov 2, 2018
Priority date	Nov 2, 2018
Publication date	Nov 24, 2020
Grant date	Nov 24, 2020

Abstract

An event detection system for a vehicle includes a transmitter and a receiver. The transmitter is disposed at a first position adjacent to a boundary of a space provided in the vehicle, including a first antenna having a transmitting direction, and the receiver is disposed at a second position adjacent to the boundary, which communicates with the transmitter and includes a second antenna having a receiving direction. The transmitter sends a probe signal toward the transmitting direction, and the receiver receives the probe signal. The receiver stores preset CSI. The preset CSI includes a first CSI and a normal CSI, the receiver obtains a current CSI from the probe signal by performing a time-reversal process, and to compare the current CSI to the preset CSI. When the first CSI is matched to the current CSI, a first event associated with the vehicle is determined to be occurred.

First claim

What is claimed is:

1. An event detection system for a vehicle, comprising:
a transmitter disposed at a first position adjacent to a boundary of a space provided in the vehicle, including a first antenna having a transmitting direction; and
a receiver, disposed at a second position adjacent to the boundary of the space provided in the vehicle, communicating with the transmitter and including a second antenna having a receiving direction, wherein the transmitter is configured to send a probe signal toward the transmitting direction while producing an estimated channel state information (CSI) between the transmitter and the receiver, and the receiver is configured to receive the probe signal, wherein the receiver further includes:
a processor; and
a memory connected to the processor, configured to store a preset CSI, wherein the preset CSI includes a first CSI and a normal CSI, wherein the processor is configured to time-reverse and conjugate the estimated CSI to obtain a current CSI from the probe signal by performing a time-reversal process, and to compare the current CSI to the preset CSI,

wherein when the first CSI is matched to the current CSI, a first event associated with the vehicle is determined to be occurred.

2. The event detection system according to claim 1 , wherein the processor is configured to calculate a first time-reversal resonating strength (TRRS) value between the current CSI and the first CSI, and a second TRRS value between the current CSI and the normal CSI; and
wherein the first CSI is determined to be matched to the current CSI if the first TRRS value is larger than the second TRRS value and a threshold.

3. The event detection system according to claim 2 , wherein the preset CSI further includes a second CSI, and the processor is configured to calculate a third time-reversal resonating strength (TRRS) value between the current CSI and the second CSI,
wherein the third CSI is determined to be matched to the current CSI if the third TRRS value is larger than the first TRRS value, the second TRRS value, and the threshold, and
wherein when the third CSI is matched to the current CSI, a second event associated with the vehicle is determined to be occurred.

4. The event detection system according to claim 1 , wherein the transmitting direction is a first peak gain direction of the first antenna and the receiving direction is a second peak gain direction of the second antenna.

5. The event detection system according to claim 4 , wherein the first peak gain direction is not directly pointed to the receiver and the second peak gain direction is not directly pointed to the transmitter.

6. The event detection system according to claim 4 , wherein a positional relationship between the first position and the second position provides the non-line of sight link between the transmitter and the receiver when the first peak gain direction is directly pointed to the receiver and the second peak gain direction is directly pointed to the transmitter.

7. The event detection system according to claim 4 , wherein the first and second peak gain directions are substantially parallel to each other.

8. The event detection system according to claim 7 , wherein first and second projection directions are components projected respectively by the first and second peak gain directions on a ground where the vehicle is placed, and the first and second projection directions are substantially parallel to each other.

9. The event detection system according to claim 4 , wherein a first projection direction is a component projected by the first peak gain direction of the first antenna projected on a ground, and the first projection direction is rotatable in a first rotational angle range determined according to a beamwidth of the first antenna with respect to a first direction, and
wherein a second projection direction is a component projected by the second peak gain directions of the second antenna array projected on the ground, and the second projection direction is rotatable in a second rotational angle range determined according to a beamwidth of the second antenna array with respect to a second direction, and
wherein the first direction and the second direction are substantially parallel to each other.

10. The event detection system according to claim 9 , wherein the first rotational angle range is determined by subtracting an angle associated with the beamwidth of the first antenna from 180°, and
wherein the second rotational angle range is determined by subtracting an angle associated with the beamwidth of the second antenna array from 180°.

11. The event detection system according to claim 1 , wherein the receiver further includes a wireless communication circuit coupled to the processor, wherein when the first event is determined to be occurred, the wireless communication circuit is configured to generate and transmit a first event alarm signal.

12. An event detection method for a vehicle, comprising:
providing a transmitter at a first position adjacent to a boundary of a space provided in the vehicle, wherein the transmitter includes a first antenna having a transmitting direction;
providing a receiver at a second position adjacent to the boundary of the space provided in the vehicle, wherein the receiver includes a second antenna having a receiving direction, a processor and a memory;
configuring the receiver to communicate with the transmitter;
configuring the transmitter to send a probe signal toward the transmitting direction while producing an estimated channel state information (CSI) between the transmitter and the receiver;
configuring the receiver to receive the probe signal;
configuring the memory to store a preset CSI, wherein the preset CSI includes a first CSI and a normal CSI; and
configuring the processor to time-reverse and conjugate the estimated CSI to obtain a current CSI from the probe signal by performing a time-reversal process, and compare the current CSI to the preset CSI,
wherein when the first CSI is matched to the current CSI, a first event associated with the vehicle is determined to be occurred.

13. The event detection method according to claim 12 , further including:
configuring the processor to calculate a first time-reversal resonating strength (TRRS) value between the current CSI and the first CSI, and a second TRRS value between the current CSI and the normal CSI, wherein the first CSI is determined to be matched to the current CSI if the first TRRS value is larger than the second TRRS value and a threshold.

14. The event detection method according to claim 13 , wherein the preset CSI further includes a second CSI, and the processor is configured to calculate a third time-reversal resonating strength (TRRS) value between the current CSI and the second CSI,
wherein the third CSI is determined to be matched to the current CSI if the third TRRS value is larger than the first TRRS value, the second TRRS value, and the threshold, and
wherein when the third CSI is matched to the current CSI, a second event associated with the vehicle is determined to be occurred.

15. The event detection method according to claim 12 , wherein the transmitting direction is a first peak gain direction of the first antenna and the receiving direction is a second peak gain direction of the second antenna.

16. The event detection method according to claim 15 , wherein the first peak gain direction is not directly pointed to the receiver and the second peak gain direction is not directly pointed to the transmitter.

17. The event detection method according to

Assignees

• Wistron Neweb Corp

Inventors

• Wei Ya-Ping
• Chang Huai-Ming
• Huang Tsun-Che

Classifications

• G01S13/003 Primary

  Bistatic radar systems; Multistatic radar systems · CPC title

• G01S5/0226

  Transmitters · CPC title

• G01S13/56

  for presence detection {(presence detection using near field arrangements G01V3/00, e.g. G01V3/08, G01V3/12; burglar, theft or intruder alarms with electrical actuation G08B13/22 - G08B13/26)} · CPC title

• H01Q1/32

  Adaptation for use in or on road or rail vehicles · CPC title

• H04B7/0626 Primary

  Channel coefficients, e.g. channel state information [CSI] · CPC title