Positioning and detection system and positioning and detection method

Abstract

A positioning and detection system and a positioning and detection method, relating to the technical field of intelligent vehicles. The positioning and detection system comprises: an ultra-wideband (UWB) positioning anchor point; and a UWB positioning and detection anchor point, wherein the UWB positioning and detection anchor point comprises a plurality of working modes, and the UWB positioning and detection anchor point performs switching of the plurality of working modes on the basis of a mode switching signal so as to realize an in-vehicle living being presence detection function or realize a digital key positioning function in conjunction with the UWB positioning anchor point. According to a vehicle-mounted system integrating positioning and living being presence detection, the presence of living beings such as an infant and a pet can be detected, preventing the infant or the pet being left in a vehicle, and accurate positioning of a digital key is achieved. Multiplexing of UWB anchor points is realized by organically integrating two systems, reducing the number of UWB anchor points installed on the vehicle while guaranteeing the positioning and detection performance, thereby improving the point distribution coordination, and reducing the costs.

Description

Positioning detection system and positioning detection method

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on July 12, 2023, with application number 202310850318.8 and application name “A Positioning Detection System and Positioning Detection Method”, the entire contents of which are incorporated by reference into the application. Technical Field

[0002] The present application relates to the field of intelligent vehicle technology, and in particular to a positioning detection system and a positioning detection method. Background Art

[0003] At present, UWB (Ultra Wide Band) technology has been widely used in the field of smart cars and can realize various functions related to smart cars.

[0004] However, multiple UWB anchor points used to implement various functions are installed on smart cars at the same time, which results in a large number of UWB anchor points, lack of coordination, and increased costs.

[0005] Application Contents

[0006] In view of this, the present application provides a positioning detection system and a positioning detection method, which realize ultra-wideband anchor point multiplexing, while ensuring positioning and detection performance, reducing the number of ultra-wideband anchor points installed on the vehicle.

[0007] In a first aspect, an embodiment of the present application provides a positioning detection system, comprising:

[0008] Ultra-wideband positioning anchors; and,

[0009] An ultra-wideband positioning detection anchor point includes multiple working modes. The ultra-wideband positioning detection anchor point switches between the multiple working modes based on a mode switching signal to realize the in-vehicle liveness detection function, or cooperates with the ultra-wideband positioning anchor point to realize the digital key positioning function.

[0010] The above system according to the embodiment of the present application may also have the following additional technical features:

[0011] In the above technical solution, optionally, the ultra-wideband positioning anchor points include multiple ones, and the multiple ultra-wideband positioning anchor points are respectively set around the vehicle.

[0012] In any of the above technical solutions, optionally, the ultra-wideband positioning detection anchor point includes at least one, and the at least one ultra-wideband positioning detection anchor point is used to detect the living conditions corresponding to the front row and / or the rear row in the vehicle.

[0013] In any of the above technical solutions, optionally, the ultra-wideband positioning detection anchor point includes:

[0014] Ultra-wideband detection branch, used to implement in-vehicle liveness detection function;

[0015] Ultra-wideband positioning branch, used to realize the digital key positioning function; and

[0016] A radio frequency switch is configured to switch between the ultra-wideband detection branch and the ultra-wideband positioning branch in response to the mode switching signal.

[0017] In any of the above technical solutions, optionally, the ultra-wideband detection branch includes a first ultra-wideband module, a second ultra-wideband module, a directional transmitting antenna and a directional receiving antenna, and the second ultra-wideband module is connected to the directional receiving antenna;

[0018] The ultra-wideband positioning branch includes the first ultra-wideband module and an omnidirectional antenna;

[0019] The radio frequency switch controls the first ultra-wideband module to communicate with the directional transmitting antenna or the omnidirectional antenna based on the mode switching signal.

[0020] In a second aspect, an embodiment of the present application provides a positioning detection method applied to an ultra-wideband positioning detection anchor point, wherein the ultra-wideband positioning detection anchor point includes multiple operating modes, and the method includes:

[0021] Get mode switching signal;

[0022] The plurality of working modes are switched based on the mode switching signal to realize a liveness detection function or a digital key positioning function in the vehicle.

[0023] The above method according to the embodiment of the present application may also have the following additional technical features:

[0024] In the above technical solution, optionally, the working mode includes a detection mode and a positioning mode;

[0025] The switching of the plurality of working modes based on the mode switching signal to realize the in-vehicle living body detection function or the digital key positioning function includes:

[0026] Based on the mode switching signal of the detection mode, switch to the detection mode to realize the in-vehicle living body detection function; or,

[0027] Based on the mode switching signal of the positioning mode, switch to the positioning mode to realize the digital key positioning function.

[0028] In any of the above technical solutions, optionally, the working mode includes a mixed mode of detection and positioning;

[0029] The switching of the plurality of working modes based on the mode switching signal to realize the in-vehicle living body detection function or the digital key positioning function includes:

[0030] Switching to the hybrid mode based on a mode switching signal of the hybrid mode;

[0031] In the hybrid mode, switching is performed between the detection mode and the positioning mode at preset time intervals to implement the in-vehicle living body detection function or the digital key positioning function.

[0032] In any of the above technical solutions, optionally, the ultra-wideband positioning detection anchor point includes a directional antenna and an omnidirectional antenna; and the method further includes:

[0033] In the detection mode, turning on the directional antenna;

[0034] In the positioning mode, the omnidirectional antenna is turned on.

[0035] In any of the above technical solutions, optionally, the working mode includes a detection mode, a positioning mode, and a mixed mode of detection and positioning; and the method further includes:

[0036] The detection mode, the positioning mode and the mixed mode are switched according to the position of the digital key and / or the presence of a living body in the vehicle.

[0037] In an embodiment of the present application, the positioning and detection system includes two UWB anchor points: an ultra-wideband positioning anchor point and an ultra-wideband positioning and detection anchor point. The ultra-wideband positioning anchor point can implement the digital key positioning function, that is, the UWB frame transceiver is used for digital key positioning; the ultra-wideband positioning and detection anchor point can implement the digital key positioning function and the in-vehicle liveness detection function, that is, the UWB frame transceiver of the ultra-wideband positioning and detection anchor point is reused for digital key positioning and in-vehicle liveness detection. Specifically, after receiving the mode switching signal, the ultra-wideband positioning and detection anchor point switches the working mode according to the mode switching signal, thereby performing in-vehicle liveness detection or digital key positioning. The embodiment of the present application proposes a combined system of vehicle-mounted positioning and liveness detection. On the one hand, it can detect living things such as babies and pets, avoiding the problem of babies or pets being left in the car, and can accurately locate digital keys; on the other hand, it can organically combine the two systems to realize UWB anchor point reuse, while ensuring positioning and detection performance, reducing the number of UWB anchor points installed on the vehicle, improving point coordination, and reducing costs.

[0038] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0040] FIG1 shows one schematic diagram of a vehicle-based positioning detection system according to an embodiment of the present application;

[0041] FIG2 shows a second schematic diagram of a vehicle-based positioning detection system according to an embodiment of the present application;

[0042] FIG3 shows a schematic diagram of the principle of a UWB radar according to an embodiment of the present application;

[0043] FIG4 is a schematic diagram showing the movement speed of a living body according to an embodiment of the present application;

[0044] FIG5 is a schematic diagram showing a flow chart of a method for detecting a living body in a vehicle according to an embodiment of the present application;

[0045] FIG6 is a schematic diagram showing the principle of UWB positioning according to an embodiment of the present application;

[0046] FIG7 shows a schematic diagram of the structure of an ultra-wideband positioning detection anchor point according to an embodiment of the present application;

[0047] FIG8 is a schematic diagram showing a flow chart of a positioning detection method according to an embodiment of the present application;

[0048] FIG9 shows a logic diagram of time-division multiplexing within a cycle according to an embodiment of the present application;

[0049] FIG10 shows a logic diagram of working mode switching according to an embodiment of the present application.

[0050] Among them, the correspondence between the reference numerals and component names in the figure is: 101 ultra-wideband positioning anchor point, 102 ultra-wideband positioning detection anchor point, 200 vehicle, 121 first ultra-wideband module, 122 second ultra-wideband module, 123 directional transmitting antenna, 124 directional receiving antenna, 125 omnidirectional antenna, 126 RF switch. DETAILED DESCRIPTION

[0051] The following will be combined with the accompanying drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of this application.

[0052] The terms "first," "second," and the like in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of this application can be implemented in an order other than that illustrated or described herein, and that the objects distinguished by "first," "second," and the like are generally of the same type, and do not limit the number of objects; for example, the first object can be one or more. In addition, the term "and / or" in the specification and claims refers to at least one of the connected objects, and the character " / " generally indicates that the objects connected are in an "or" relationship.

[0053] The following describes in detail the positioning detection system and positioning detection method provided in the embodiments of the present application through specific embodiments and their application scenarios in conjunction with the accompanying drawings.

[0054] The present application provides a positioning detection system, as shown in FIG1 and FIG2 , which includes:

[0055] Ultra-wideband positioning anchor point 101; and

[0056] The ultra-wideband positioning detection anchor point 102 includes multiple working modes. The ultra-wideband positioning detection anchor point 102 switches between the multiple working modes based on the mode switching signal to realize the in-vehicle liveness detection function, or cooperates with the ultra-wideband positioning anchor point 101 to realize the digital key positioning function.

[0057] In this embodiment, the positioning and detection system includes two UWB anchor points: an ultra-wideband positioning anchor point 101 and an ultra-wideband positioning and detection anchor point 102. Ultra-wideband positioning anchor point 101 can implement the digital key positioning function, that is, the UWB frame transceiver is used for digital key positioning; ultra-wideband positioning and detection anchor point 102 can implement the digital key positioning function and the in-vehicle liveness detection function, that is, the UWB frame transceiver of ultra-wideband positioning and detection anchor point 102 is reused for digital key positioning and in-vehicle liveness detection.

[0058] Specifically, after receiving the mode switching signal, the ultra-wideband positioning detection anchor point 102 switches the working mode according to the mode switching signal, thereby performing in-vehicle living body detection or digital key positioning.

[0059] When performing in-vehicle liveness detection, the ultra-wideband positioning detection anchor point 102 installed on the vehicle is a UWB radar system. Its principle is shown in Figure 3. The UWB radar system includes a UWB transmitter and a UWB receiver. The UWB transmitter periodically transmits a UWB frame signal. After being reflected by a reflective object, the UWB receiver will receive the reflected UWB frame signal.

[0060] By using the difference between the reflected signals, the change of the reflective object relative to the UWB radar can be determined. The UWB transmitter continuously transmits UWB frame signals, and the UWB receiver continuously receives UWB frame signals, which can determine the continuous change of the reflective object.

[0061] Taking two consecutive reflection signals as an example, assuming that the value of reflection signal 1 is S1 is a complex number, A1 represents the intensity amplitude of the reflected signal, and the angle Represents the phase of the reflected signal. When the reflector changes, for example, the reflector moves slightly toward the UWB radar system, the reflected signal becomes reflected signal 2, which is Because the reflector doesn't move a significant distance in a short period of time, the intensity of the reflected signal doesn't change much; the main change is in the phase. For example, if the reflector moves Δx toward the UWB radar system, Δx is very small, much smaller than the wavelength. A typical wavelength is 4cm (at an 8GHz carrier frequency), and Δx is less than 1cm. Then, reflected signal 2 will reach the UWB receiver earlier than reflected signal 1 by a distance calculated as: Δl = 2Δx·sinθ

[0062] Then the phase of reflected signal 2 will be ahead of the phase of reflected signal 1, and the advance amplitude is:

[0063] Where λ is the wavelength of reflected signal 1 and reflected signal 2. If the transmission interval of the UWB transmitter is Δt, the rate of change of the phase (that is, the angular frequency of the reflected signal change) is:

[0064] Where v is the velocity of the reflecting object, which is positive when it moves toward the UWB radar system.

[0065] Therefore, there is a correlation between the angular frequency of the reflected signal change and the speed of the reflecting object. By measuring the change in angular frequency and based on the configuration of the reflecting object and the radar, the velocity component of the reflecting object can be obtained.

[0066] Based on the above information, a UWB radar system can be used to detect living beings inside a vehicle, specifically their movement and breathing. As shown in Figure 3, if the reflective object is a person, since people unconsciously move when awake and breathe while sleeping, their chests rise and fall. Corresponding to radar speed detection, as shown in Figure 4, when no one is around, the speed may not be detected; unconscious human movement may cause the detected speed to fluctuate randomly; and when a person is asleep and breathing, a regular speed waveform may appear.

[0067] Based on the above principle, the in-vehicle liveness detection function can be realized. As shown in Figure 5, the in-vehicle liveness detection method includes:

[0068] Take the reflected signal over a period of time to calculate the reflected object speed v; determine whether the absolute value of the reflected object speed v is greater than the activity threshold. If so, it is determined that someone is awake and active; if not, determine whether the reflected object speed v has periodic oscillations and the oscillation period is between 3 seconds and 15 seconds. If so, it is determined that someone is quiet; otherwise, it is determined that no one is there.

[0069] When locating the digital key, as shown in Figure 6, an ultra-wideband positioning anchor point and an ultra-wideband positioning detection anchor point are installed on the vehicle, both of which serve as UWB ranging anchor points. By measuring the distance intersection, the position of the digital key can be obtained. Specifically, positioning is performed by measuring the propagation time of the signal between the digital key and multiple UWB ranging anchor points respectively. Circular positioning can be used. For example, if the straight-line distance from the digital key to the UWB ranging anchor point i is known to be Ri, then according to the principle of geometry, the position of the digital key must be on a circle with the position of the UWB ranging anchor point i as the center and Ri as the radius. Similarly, the common intersection of multiple circles corresponding to multiple UWB ranging anchor points is the position of the digital key.

[0070] The embodiment of the present application proposes a combined system of vehicle-mounted positioning and liveness detection. On the one hand, it can detect living things such as babies and pets, avoiding the problem of babies or pets being left in the car, and can accurately locate digital keys; on the other hand, it can organically combine the two systems to realize UWB anchor point reuse, while ensuring positioning and detection performance, reducing the number of UWB anchor points installed on the vehicle, improving point coordination, and reducing costs.

[0071] In one embodiment of the present application, the ultra-wideband positioning anchor points 101 include multiple ones, and the multiple ultra-wideband positioning anchor points 101 are respectively set around the vehicle.

[0072] In this embodiment, multiple ultra-wideband positioning anchor points 101 are provided around the vehicle. For example, as shown in FIG1 and FIG2 , multiple ultra-wideband positioning anchor points 101 are provided at the left front, right front, left rear, and right rear of the vehicle 200 .

[0073] In the embodiment of the present application, multiple ultra-wideband positioning anchor points are set at different positions of the vehicle to achieve long-range intersection, so that the position of the digital key can be accurately obtained.

[0074] In one embodiment of the present application, the ultra-wideband positioning detection anchor point 102 includes at least one, and the at least one ultra-wideband positioning detection anchor point 102 is used to detect the living conditions corresponding to the front row and / or the rear row in the vehicle.

[0075] In this embodiment, the vehicle is equipped with at least one ultra-wideband positioning detection anchor point 102. For example, as shown in FIG1 , the vehicle is equipped with one ultra-wideband positioning detection anchor point 102. The ultra-wideband positioning detection anchor point 102 can be installed relative to the front seat to perform liveness detection on the front seat, or can be installed relative to the rear seat to perform liveness detection on the rear seat.

[0076] For example, as shown in FIG2 , two ultra-wideband positioning detection anchor points 102 are installed on the vehicle, one relative to the front seat and the other to the rear seat, so as to simultaneously detect whether there are living people in the front and rear seats.

[0077] Through the above method, it is possible to reduce the number of UWB anchor points while ensuring accurate liveness detection of any seat.

[0078] In one embodiment of the present application, the ultra-wideband positioning detection anchor point 102 includes:

[0079] Ultra-wideband detection branch, used to implement in-vehicle liveness detection function;

[0080] Ultra-wideband positioning branch, used to realize the digital key positioning function; and

[0081] A radio frequency switch is configured to switch between the ultra-wideband detection branch and the ultra-wideband positioning branch in response to the mode switching signal.

[0082] In this embodiment, the ultra-wideband positioning detection anchor point 102 includes two antenna systems, and a radio frequency switch is used to switch between the two antenna systems.

[0083] The two antenna systems include an ultra-wideband detection branch and an ultra-wideband positioning branch. The ultra-wideband detection branch is used to realize the in-vehicle liveness detection function, and the ultra-wideband positioning branch is used to realize the digital key positioning function.

[0084] As shown in FIG7 , the ultra-wideband detection branch includes a first ultra-wideband module 121 , a second ultra-wideband module 122 , a directional transmitting antenna 123 and a directional receiving antenna 124 , wherein the second ultra-wideband module 122 is connected to the directional receiving antenna 124 ;

[0085] The ultra-wideband positioning branch includes a first ultra-wideband module 121 and an omnidirectional antenna 125;

[0086] The RF switch 126 controls the first ultra-wideband module 121 to connect to the directional transmitting antenna 123 or the omnidirectional antenna 125 based on the mode switching signal.

[0087] In this embodiment, the ultra-wideband detection branch includes a first ultra-wideband module 121, a second ultra-wideband module 122, a directional transmitting antenna 123 and a directional receiving antenna 124. The first ultra-wideband module 121 and the directional transmitting antenna 123 are respectively connected to the RF switch 126, and the second ultra-wideband module 122 is connected to the directional receiving antenna 124.

[0088] The ultra-wideband positioning branch includes a first ultra-wideband module 121 and an omnidirectional antenna 125 . The first ultra-wideband module 121 and the omnidirectional antenna 125 are respectively connected to a radio frequency switch 126 .

[0089] It should be noted that the UWB detection anchor point for in-car liveness detection needs to be facing the seat to detect whether there is a live person on the seat, while the UWB positioning anchor point needs to communicate with the digital key in any possible direction. Therefore, the antenna for in-car liveness detection is a directional antenna, with the optimal direction being facing the seat. The antenna for the digital key positioning function is an omnidirectional antenna. This approach ensures better positioning or detection functions.

[0090] The RF switch 126 controls the first ultra-wideband module 121 to connect to the directional transmitting antenna 123 or the omnidirectional antenna 125 based on the received mode switching signal. In one embodiment, the operating modes include detection mode, positioning mode, and a mixed mode of detection and positioning. Based on the mode switching signal of the detection mode, the RF switch 126 connects the first ultra-wideband module 121 to the directional transmitting antenna 123. The first ultra-wideband module 121 sends UWB frame signals through the directional transmitting antenna 123, and the second ultra-wideband module 122 receives UWB frame signals through the directional receiving antenna 124 to realize the in-vehicle liveness detection function. Based on the mode switching signal of the positioning mode, the RF switch 126 connects the first ultra-wideband module 121 to the omnidirectional antenna 125. The first ultra-wideband module 121 performs UWB ranging communication with the digital key through the omnidirectional antenna 125 to realize the digital key positioning function. Based on the mode switching signal of the hybrid mode, the RF switch 126 connects the first ultra-wideband module 121 to the directional transmitting antenna 123 and the omnidirectional antenna 125 respectively at preset time intervals to achieve switching of the in-vehicle living body detection function or the digital key positioning function.

[0091] In the embodiment of the present application, a radio frequency switch is set to realize switching between the ultra-wideband detection branch and the ultra-wideband positioning branch, so that at least two functions can be multiplexed on one UWB anchor point, thereby reducing the number of UWB anchor points installed on the vehicle and reducing costs.

[0092] The present application provides a positioning detection method, which is applied to an ultra-wideband positioning detection anchor point. The ultra-wideband positioning detection anchor point includes multiple working modes. As shown in FIG8 , the method includes:

[0093] Step 801: Acquire a mode switching signal;

[0094] Step 802: Switch between the plurality of working modes based on the mode switching signal to implement a liveness detection function or a digital key positioning function within the vehicle.

[0095] In this embodiment, after receiving the mode switching signal, the working mode is switched according to the mode switching signal, thereby performing in-vehicle living body detection or digital key positioning.

[0096] The embodiment of the present application proposes a combined system of vehicle-mounted positioning and liveness detection. On the one hand, it can detect living things such as babies and pets, avoiding the problem of babies or pets being left in the car, and can accurately locate digital keys; on the other hand, it can organically combine the two systems to realize UWB anchor point reuse, while ensuring positioning and detection performance, reducing the number of UWB anchor points installed on the vehicle, improving point coordination, and reducing costs.

[0097] In one embodiment of the present application, the working modes include a detection mode, a positioning mode, and a mixed mode of detection and positioning.

[0098] In this embodiment, the dual-function UWB anchor point has three functional modes, including a detection mode (also known as a radar mode), a positioning mode (also known as a ranging mode), and a hybrid mode of detection and positioning.

[0099] Through the control of the above three modes, multiplexing of at least two functions is achieved on the UWB anchor point.

[0100] In one embodiment of the present application, the switching of the plurality of operating modes based on the mode switching signal to implement an in-vehicle liveness detection function or a digital key positioning function includes:

[0101] Based on the mode switching signal of the detection mode, switch to the detection mode to realize the in-vehicle living body detection function.

[0102] In this embodiment, when the mode switching signal is a signal for switching to the detection mode, the ultra-wideband positioning detection anchor point is switched to the detection mode, and in-vehicle living body detection is performed in the detection mode.

[0103] In one embodiment, the ultra-wideband positioning detection anchor point includes a directional antenna; the method further includes: in the detection mode, turning on the directional antenna.

[0104] The ultra-wideband positioning detection anchor point switches to detection mode and uses a directional antenna to complete the transmission and reception of UWB frame signals to monitor living things in the car, improving the accuracy of living thing monitoring in the car.

[0105] In one embodiment of the present application, the switching of the plurality of operating modes based on the mode switching signal to implement an in-vehicle liveness detection function or a digital key positioning function includes:

[0106] Based on the mode switching signal of the positioning mode, switch to the positioning mode to realize the digital key positioning function.

[0107] In this embodiment, when the mode switching signal is a signal for switching to the positioning mode, the ultra-wideband positioning detection anchor point is switched to the positioning mode, and the digital key is positioned in the positioning mode.

[0108] In one embodiment, the ultra-wideband positioning detection anchor point includes an omnidirectional antenna; the method further includes: in the positioning mode, turning on the omnidirectional antenna.

[0109] The ultra-wideband positioning detection anchor point switches to positioning mode, uses an omnidirectional antenna to complete ranging with the digital key, and transmits the ranging results to the solution system to calculate the position of the digital key, thereby improving the accuracy of the digital key positioning.

[0110] In one embodiment of the present application, the switching of the plurality of operating modes based on the mode switching signal to implement an in-vehicle liveness detection function or a digital key positioning function includes:

[0111] Switching to the hybrid mode based on a mode switching signal of the hybrid mode;

[0112] In the hybrid mode, switching is performed between the detection mode and the positioning mode at preset time intervals to implement the in-vehicle living body detection function or the digital key positioning function.

[0113] In this embodiment, the hybrid mode is that the ultra-wideband positioning detection anchor point switches back and forth between the detection mode and the positioning mode in a time-sharing manner, that is, radar and ranging are time-sharing multiplexed, for example, switching once every 100 ms.

[0114] For example, as shown in Figure 9, a 96ms block period is used for ranging, during which radar and ranging are time-division multiplexed. Ranging is performed for one round of the 96ms, which lasts from 10 to 20ms. The remaining rounds are not used for ranging and are instead used for radar. The position of the rounds within the block varies, including two scenarios, eg1 and eg2, representing the more ideal and less ideal scenarios, respectively.

[0115] In the ideal case, eg1, the ranging and radar functions switch twice within a cycle. In the less ideal case, eg2, the ranging and radar functions switch four times within a cycle. The switching time Trof between the ranging and radar functions is ≤ 4ms.

[0116] Under the less-than-ideal scenario corresponding to example 2, within a 96ms period (Ranging Block), the ranging function's effective duration (Ranging Round) is 24ms, and the radar function's effective duration (Rader Round) is 56ms. Without affecting the ranging function, the radar signal duty cycle (Radar Round divided by the periodic block) is 58.3%. A radar function duty cycle exceeding 20% ​​meets performance requirements. Under less-than-ideal conditions, both ranging and radar functions meet requirements.

[0117] In hybrid mode, the in-vehicle liveness detection function and the digital key positioning function can be switched, automatically realizing both functions.

[0118] In one embodiment of the present application, the operating mode includes a detection mode, a positioning mode, and a mixed mode of detection and positioning; and the method further includes:

[0119] The detection mode, the positioning mode and the mixed mode are switched according to the position of the digital key and / or the presence of a living body in the vehicle.

[0120] In this embodiment, when the dual-function UWB anchor point is reused, a specific logic switching function is followed based on the location of the digital key and the presence of live objects in the vehicle. For example, liveness detection is primarily used to prevent the danger of leaving babies or pets in the vehicle. However, if the digital key positioning function determines that the driver is still in the vehicle, there is no need to enable the in-vehicle liveness detection function of the UWB positioning detection anchor point.

[0121] Specifically, as shown in Figure 10, in hybrid mode, the system periodically detects whether a person is inside the vehicle and the location of the digital key. If, in hybrid mode, it is determined that a person is suspected to be inside the vehicle, the system switches to detection mode for further accurate detection of the person inside the vehicle. If, in hybrid mode, it is determined that the digital key has entered the vehicle, indicating that someone is inside, there is no need to enter detection mode to continue detecting the person inside the vehicle. Instead, the system switches to positioning mode to accurately determine the location of the digital key. In other words, a preliminary determination is first made in hybrid mode, and then a precise determination is made by entering detection mode or positioning mode accordingly.

[0122] In positioning mode, the location of the digital key is detected. If the digital key is determined to be outside the vehicle in positioning mode, it means that no one is inside the vehicle. In this case, the presence of a living person in the vehicle and the location of the digital key need to be detected, and the system switches to hybrid mode.

[0123] In detection mode, it detects whether there is a living person in the car. If it is determined that there is no living person in the car, it switches to hybrid mode and continues to perform regular digital key positioning or in-car liveness detection.

[0124] In addition, when it is determined that the digital key has arrived outside the car, it can also switch from positioning mode to detection mode to detect whether there is a living person in the car; when it is determined that the digital key has entered the car, it can also switch from detection mode to positioning mode to detect whether there is a living person in the car.

[0125] Through the above method, flexible switching of the three working modes is achieved, ensuring that the switching flexibility and accuracy of different functions are improved while reducing the number of UWB anchor points.

[0126] In one embodiment of the present application, the method further includes:

[0127] In the detection mode, the living conditions corresponding to the front row and / or the rear row of the vehicle are detected.

[0128] In this embodiment, exemplarily, as shown in FIG1 , an ultra-wideband positioning detection anchor is installed on the vehicle. The ultra-wideband positioning detection anchor can be installed relative to the front seats to perform liveness detection on the front seats, or can be installed relative to the rear seats to perform liveness detection on the rear seats.

[0129] For example, as shown in FIG2 , two ultra-wideband positioning detection anchor points are installed on the vehicle, one relative to the front seat and the other to the rear seat, and can simultaneously detect whether there are living people in the front and rear seats.

[0130] Through the above method, it is possible to reduce the number of UWB anchor points while ensuring accurate liveness detection of any seat.

[0131] It should be noted that, in this article, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element. In addition, it should be noted that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the opposite order according to the functions involved. For example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0132] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms without departing from the purpose of this application and the scope of protection of the claims, all of which are within the protection of this application.

Claims

1. A positioning detection system, wherein: include: Ultra-wideband positioning anchor point; as well as, An ultra-wideband positioning detection anchor point, wherein the ultra-wideband positioning detection anchor point includes a plurality of working modes, and the ultra-wideband positioning detection anchor point switches between the plurality of working modes based on a mode switching signal to realize a liveness detection function in the vehicle, or cooperates with the ultra-wideband positioning anchor point to realize a digital key positioning function.

2. The system according to claim 1, wherein: The ultra-wideband positioning anchor points include a plurality of ultra-wideband positioning anchor points, and the plurality of ultra-wideband positioning anchor points are respectively arranged around the vehicle.

3. The system according to claim 1, wherein: The ultra-wideband positioning detection anchor point includes at least one, and the at least one ultra-wideband positioning detection anchor point is used to detect the living body situation corresponding to the front row and / or the rear row in the vehicle.

4. The system according to any one of claims 1 to 3, wherein: The ultra-wideband positioning detection anchor point includes: Ultra-wideband detection branch, used to realize the in-vehicle liveness detection function; Ultra-wideband positioning branch, used to realize the digital key positioning function; and A radio frequency switch is used to switch the ultra-wideband detection branch and the ultra-wideband positioning branch in response to the mode switching signal.

5. The system according to claim 4, wherein: The ultra-wideband detection branch comprises a first ultra-wideband module, a second ultra-wideband module, a directional transmitting antenna and a directional receiving antenna, and the second ultra-wideband module is connected to the directional receiving antenna; The ultra-wideband positioning branch includes the first ultra-wideband module and an omnidirectional antenna; The radio frequency switch controls the first ultra-wideband module to be connected to the directional transmitting antenna or to be connected to the omnidirectional antenna based on the mode switching signal.

6. A positioning detection method, wherein: Applied to an ultra-wideband positioning detection anchor point, the ultra-wideband positioning detection anchor point includes multiple working modes, and the method includes: Get mode switching signal; The plurality of working modes are switched based on the mode switching signal to realize a liveness detection function or a digital key positioning function in the vehicle.

7. The method according to claim 6, wherein: The working modes include detection mode and positioning mode; The switching of the plurality of working modes based on the mode switching signal to realize a liveness detection function or a digital key positioning function in a vehicle includes: Based on the mode switching signal of the detection mode, switch to the detection mode to realize the in-vehicle living body detection function; or, Based on the mode switching signal of the positioning mode, switch to the positioning mode to realize the digital key Positioning function.

8. The method according to claim 6, wherein: The working mode includes a mixed mode of detection and positioning; The switching of the plurality of working modes based on the mode switching signal to realize a liveness detection function or a digital key positioning function in a vehicle includes: Based on the mode switching signal of the hybrid mode, switching to the hybrid mode; In the hybrid mode, switching is performed between the detection mode and the positioning mode at preset time intervals to implement a liveness detection function or a digital key positioning function within the vehicle.

9. The method according to claim 7 or 8, wherein: The ultra-wideband positioning detection anchor point includes a directional antenna and an omnidirectional antenna; the method also includes: In the detection mode, turning on the directional antenna; In the positioning mode, the omnidirectional antenna is turned on.

10. The method according to claim 6, wherein: The working modes include a detection mode, a positioning mode, and a mixed mode of detection and positioning; the method further includes: The detection mode, the positioning mode and the mixed mode are switched according to the position of the digital key and / or the presence of a living body in the vehicle.

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