Positioning detection system and positioning detection method

Abstract

The invention provides a positioning detection system and a positioning detection method, and relates to the technical field of intelligent automobiles. The positioning detection system comprises an ultra wide band positioning anchor point; the system comprises an ultra-wideband positioning detection anchor point, the ultra-wideband positioning detection anchor point comprises a plurality of working modes, and the ultra-wideband positioning detection anchor point switches the plurality of working modes based on a mode switching signal so as to realize an in-vehicle living body detection function, or cooperates with the ultra-wideband positioning anchor point to realize a digital key positioning function. According to the vehicle-mounted positioning and living body detection combined system provided by the invention, detection of living bodies such as infants and pets can be realized, the problem that the infants or pets are left on a vehicle is avoided, and accurate positioning of digital keys can be realized; two systems are organically combined, UWB anchor point multiplexing is achieved, the number of UWB anchor points installed on a vehicle is reduced while positioning and detection performance is guaranteed, point distribution coordination is improved, and cost is reduced.

Description

Technical Field

[0001] The present application relates to the field of intelligent automobile technology, and in particular to a positioning detection system and a positioning detection method. Background Art

[0002] 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.

[0003] 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. Summary of the invention

[0004] In view of this, the present application provides a positioning detection system and a positioning detection method, which realizes ultra-wideband anchor point multiplexing, while ensuring positioning and detection performance, reducing the number of ultra-wideband anchor points installed on the vehicle.

[0005] In a first aspect, an embodiment of the present application provides a positioning detection system, including:

[0006] Ultra-wideband positioning anchor points; and,

[0007] 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.

[0008] According to the above system of the embodiment of the present application, the following additional technical features may also be provided:

[0009] 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 arranged around the vehicle.

[0010] 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.

[0011] In any of the above technical solutions, optionally, the ultra-wideband positioning detection anchor point includes:

[0012] Ultra-wideband detection branch, used to realize the in-vehicle liveness detection function;

[0013] Ultra-wideband positioning branch, used to realize the digital key positioning function; and

[0014] 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.

[0015] 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;

[0016] The ultra-wideband positioning branch includes the first ultra-wideband module and an omnidirectional antenna;

[0017] 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.

[0018] In a second aspect, an embodiment of the present application provides a positioning detection method, which is applied to an ultra-wideband positioning detection anchor point, wherein the ultra-wideband positioning detection anchor point includes multiple working modes, and the method includes:

[0019] Get mode switching signal;

[0020] 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.

[0021] According to the above method of the embodiment of the present application, the following additional technical features may also be provided:

[0022] In the above technical solution, optionally, the working mode includes a detection mode and a positioning mode;

[0023] 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:

[0024] 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,

[0025] Based on the mode switching signal of the positioning mode, switch to the positioning mode to realize the digital key positioning function.

[0026] In any of the above technical solutions, optionally, the working mode includes a mixed mode of detection and positioning;

[0027] 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:

[0028] Based on the mode switching signal of the hybrid mode, switching to the hybrid mode;

[0029] 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.

[0030] 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:

[0031] In the detection mode, turning on the directional antenna;

[0032] In the positioning mode, the omnidirectional antenna is turned on.

[0033] 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:

[0034] 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.

[0035] In an embodiment of the present application, the positioning and detection system includes two types of UWB anchor points, one is an ultra-wideband positioning anchor point, and the other is an ultra-wideband positioning and detection anchor point. The ultra-wideband positioning anchor point can realize 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 realize 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 infants and pets to avoid the problem of infants or pets being left in the car, and can accurately locate the digital key; on the other hand, it can organically combine the two systems to realize UWB anchor point multiplexing, while ensuring positioning and detection performance, reducing the number of UWB anchor points installed on the vehicle, improving the coordination of point distribution, and reducing costs.

[0036] 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

[0037] 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:

[0038] Figure 1 One of the schematic diagrams of the vehicle-based positioning detection system according to an embodiment of the present application is shown;

[0039] Figure 2 A second schematic diagram of a vehicle-based positioning detection system according to an embodiment of the present application is shown;

[0040] Figure 3 A schematic diagram showing the principle of a UWB radar according to an embodiment of the present application is shown;

[0041] Figure 4 A schematic diagram showing the movement speed of a living body according to an embodiment of the present application is shown;

[0042] Figure 5 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 is shown;

[0043] Figure 6 A schematic diagram showing the principle of UWB positioning in an embodiment of the present application is shown;

[0044] Figure 7 A schematic diagram showing the structure of an ultra-wideband positioning detection anchor point in an embodiment of the present application is shown;

[0045] Figure 8 A schematic diagram showing a flow chart of a positioning detection method according to an embodiment of the present application is shown;

[0046] Fig. 9 A logical schematic diagram of time-division multiplexing within a cycle of an embodiment of the present application is shown;

[0047] Fig.10 A logical schematic diagram of working mode switching according to an embodiment of the present application is shown.

[0048] Among them, the corresponding relationship between the reference numerals and the component names in the figure is:

[0049] 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 radio frequency switch. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0051] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0052] 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.

[0053] The present application embodiment provides a positioning detection system, such as Figure 1 and Figure 2 As shown, the positioning detection system includes:

[0054] Ultra-wideband positioning anchor point 101; and,

[0055] The ultra-wideband positioning detection anchor point 102 includes a plurality of working modes. The ultra-wideband positioning detection anchor point 102 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 101 to realize a digital key positioning function.

[0056] In this embodiment, the positioning detection system includes two UWB anchor points, one is an ultra-wideband positioning anchor point 101, and the other is an ultra-wideband positioning detection anchor point 102. The ultra-wideband positioning anchor point 101 can realize the digital key positioning function, that is, the UWB frame transceiver is used for digital key positioning; the ultra-wideband positioning detection anchor point 102 can realize the digital key positioning function and the in-vehicle liveness detection function, that is, the UWB frame transceiver of the ultra-wideband positioning detection anchor point 102 is reused for digital key positioning and in-vehicle liveness detection.

[0057] 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.

[0058] When performing in-vehicle liveness detection, the ultra-wideband positioning detection anchor point 102 installed on the vehicle is a UWB radar system, and its principle is as follows: Figure 3 As shown, the UWB radar system includes a UWB transmitting unit and a UWB receiving unit. The UWB transmitting unit periodically transmits a UWB frame signal, and after being reflected by a reflective object, the UWB receiving unit receives the reflected UWB frame signal.

[0059] The difference between the reflected signals can be used to determine the change of the reflector relative to the UWB radar. The UWB transmitter continuously transmits the UWB frame signal, and the UWB receiver continuously receives the UWB frame signal, so as to determine the continuous change of the reflector.

[0060] Take 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 will not move a large distance in a short time, the intensity of the reflected signal does not change much, and the main change is the phase. For example, the reflector moves Δx toward the UWB radar system. Δx is very small, much smaller than the wavelength. The typical value of the wavelength is 4cm (when the carrier is 8GHz), and Δx is less than 1cm. Then the reflected signal 2 will reach the UWB receiver earlier than the reflected signal 1, and the distance in advance is:

[0061] 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]

[0064] 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:

[0065]

[0066]

[0067] Where v is the velocity of the reflector, which is positive if it moves toward the UWB radar system.

[0068] 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 speed component of the reflecting object can be obtained.

[0069] Based on the above content, the UWB radar system can be used to detect living things in the car, specifically the movement and breathing of living things. Figure 3 If the reflecting object is a human body, people will move unconsciously when awake and their chests will rise and fall when they breathe when they sleep. Figure 4 As shown, when no one is around, the speed cannot be detected; unconscious activities of people will cause the detected speed to change randomly; and when people are sleeping and breathing, a regular speed change waveform will appear.

[0070] Based on the above principle, the function of in-vehicle liveness detection can be realized. Figure 5 As shown, the in-vehicle liveness detection method includes:

[0071] Take the reflected signal within a period of time and 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, if not, it is determined that there is no one.

[0072] When locating the digital key, Figure 6 As shown, 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 from the principle of geometry, it can be known that 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.

[0073] 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 infants and pets to avoid the problem of infants or pets being left in the car, and can accurately locate the digital key; on the other hand, it can organically combine the two systems to realize UWB anchor point multiplexing, while ensuring positioning and detection performance, reducing the number of UWB anchor points installed on the vehicle, improving the coordination of point distribution, and reducing costs.

[0074] In one embodiment of the present application, the ultra-wideband positioning anchor point 101 includes multiple ultra-wideband positioning anchor points 101, and the multiple ultra-wideband positioning anchor points 101 are respectively arranged around the vehicle.

[0075] In this embodiment, the ultra-wideband positioning anchor points 101 include multiple ones, which are arranged around the vehicle. Figure 1 and Figure 2 As shown, a plurality of ultra-wideband positioning anchor points 101 are respectively arranged at the left front, right front, left rear, and right rear positions of the vehicle 200 .

[0076] In the embodiment of the present application, a plurality of ultra-wideband positioning anchor points are arranged at different positions of the vehicle to achieve long-range intersection, so that the position of the digital key can be accurately obtained.

[0077] 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.

[0078] In this embodiment, at least one ultra-wideband positioning detection anchor point 102 is installed on the vehicle. Figure 1 As shown, an ultra-wideband positioning detection anchor point 102 is installed on the vehicle. The ultra-wideband positioning detection anchor point 102 can be installed relative to the front seats to perform liveness detection on the front seats, and can also be installed relative to the rear seats to perform liveness detection on the rear seats.

[0079] For example, Figure 2 As shown, two ultra-wideband positioning detection anchor points 102 are installed on the vehicle, which are installed relative to the front seats and the rear seats respectively, and can simultaneously detect whether there are living people in the front and rear seats.

[0080] Through the above method, it is possible to reduce the number of UWB anchor points while ensuring accurate liveness detection for any seat.

[0081] In one embodiment of the present application, the ultra-wideband positioning detection anchor point 102 includes:

[0082] Ultra-wideband detection branch, used to realize the in-vehicle liveness detection function;

[0083] Ultra-wideband positioning branch, used to realize the digital key positioning function; and

[0084] 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.

[0085] 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.

[0086] 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 living body detection function, and the ultra-wideband positioning branch is used to realize the digital key positioning function.

[0087] like Figure 7As shown, 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, 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;

[0089] The RF switch 126 controls the first ultra-wideband module 121 to be connected to the directional transmitting antenna 123 or to be connected to the omnidirectional antenna 125 based on the mode switching signal.

[0090] 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.

[0091] 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 connected to a radio frequency switch 126 , respectively.

[0092] It should be noted that the UWB detection anchor point corresponding to the in-car liveness detection needs to face the seat to detect whether there is a live body on the seat, and the UWB positioning anchor point needs to communicate with the digital key in any possible direction for distance measurement. Therefore, the antenna under the in-car liveness detection function is a directional antenna, and the optimal direction of the antenna is facing the seat, and the antenna of the digital key positioning function is an omnidirectional antenna. In this way, better positioning or detection functions can be guaranteed.

[0093] The RF switch 126 controls the first ultra-wideband module 121 to be connected to the directional transmitting antenna 123 or to be connected to the omnidirectional antenna 125 according to the received mode switching signal. In one embodiment, the working modes are 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, and the first ultra-wideband module 121 sends the UWB frame signal through the directional transmitting antenna 123, and the second ultra-wideband module 122 receives the UWB frame signal through the directional receiving antenna 124 to realize the in-vehicle living body 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, and 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 at preset time intervals to achieve switching of the in-vehicle living body detection function or the digital key positioning function.

[0094] In the embodiment of the present application, a radio frequency switch is set to realize the switching of 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.

[0095] The embodiment of 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, such as Figure 8 As shown, the method includes:

[0096] Step 801, obtaining a mode switching signal;

[0097] 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.

[0098] 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.

[0099] 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 infants and pets to avoid the problem of infants or pets being left in the car, and can accurately locate the digital key; on the other hand, it can organically combine the two systems to realize UWB anchor point multiplexing, while ensuring positioning and detection performance, reducing the number of UWB anchor points installed on the vehicle, improving the coordination of point distribution, and reducing costs.

[0100] 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.

[0101] In this embodiment, the dual-function UWB anchor point has three functional modes, including a detection mode (ie, radar mode), a positioning mode (ie, ranging mode), and a hybrid mode of detection and positioning.

[0102] Through the control of the above three modes, multiplexing of at least two functions is achieved on the UWB anchor point.

[0103] In one embodiment of the present application, the switching of the plurality of working modes based on the mode switching signal to realize the in-vehicle liveness detection function or the digital key positioning function includes:

[0104] Based on the mode switching signal of the detection mode, switch to the detection mode to realize the in-vehicle living body detection function.

[0105] 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.

[0106] 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.

[0107] When the ultra-wideband positioning detection anchor point is switched to the detection mode, a directional antenna is used to complete the transmission and reception of UWB frame signals to monitor living things in the car, thereby improving the accuracy of living thing monitoring in the car.

[0108] In one embodiment of the present application, the switching of the plurality of working modes based on the mode switching signal to realize the in-vehicle liveness detection function or the digital key positioning function includes:

[0109] Based on the mode switching signal of the positioning mode, switch to the positioning mode to realize the digital key positioning function.

[0110] 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.

[0111] 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.

[0112] When the ultra-wideband positioning detection anchor point switches to positioning mode, it 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 digital key positioning.

[0113] In one embodiment of the present application, the switching of the plurality of working modes based on the mode switching signal to realize the in-vehicle liveness detection function or the digital key positioning function includes:

[0114] Based on the mode switching signal of the hybrid mode, switching to the hybrid mode;

[0115] 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.

[0116] 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.

[0117] For example, Fig. 9 As shown, a 96ms period Block is used, and the period Block is the ranging period, during which radar and ranging are time-division multiplexed. One round of the 96ms is used for ranging, and the round is 10-20ms. The remaining rounds are not used for ranging, but for radar. The positions of rounds in the Block are different, and two situations, eg1 and eg2, are included. eg1 and eg2 are respectively the more ideal and less ideal situations.

[0118] In the ideal case corresponding to eg1, the ranging function and the radar function are switched twice in one cycle; in the less ideal case corresponding to eg2, the ranging function and the radar function are switched four times in one cycle. The switching time Trof of the ranging function and the radar function is ≤4ms.

[0119] In the less ideal case corresponding to eg2, within a period of 96ms (Ranging Block), the effective time of the ranging function (Ranging round) is 24ms, and the effective time of the radar function (Rader round) is 56ms. On the basis of not affecting the ranging function, the radar signal duty cycle (radar round divided by the period block) is 58.3%. The effective time duty cycle of the radar function exceeds 20% to meet the performance requirements. In the less ideal case, both the ranging and the radar can meet the requirements.

[0120] In hybrid mode, the in-vehicle liveness detection function and the digital key positioning function can be switched to automatically realize both functions.

[0121] In one embodiment of the present application, the working mode includes a detection mode, a positioning mode, and a mixed mode of detection and positioning; the method further includes:

[0122] 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.

[0123] In this embodiment, when the dual-function UWB anchor point is reused, a certain logic switching function is followed in combination with the location of the digital key and the presence of live bodies in the car. For example, live body detection is mainly to prevent babies or pets from being left in the car and causing danger. If the digital key positioning function locates that the driver is still in the car, there is no need to enable the in-car live body detection function of the ultra-wideband positioning detection anchor point.

[0124] Specifically, Fig.10 As shown, in the hybrid mode, the presence of living beings in the car and the location of the digital key are detected regularly. If in the hybrid mode, it is determined that there is a suspected living being in the car, it is switched to the detection mode to further accurately detect the living being in the car. If in the hybrid mode, it is determined that the digital key has entered the car, indicating that there is someone in the car, there is no need to enter the detection mode to continue detecting the living being in the car, but switch to the positioning mode to accurately determine the location of the digital key. In other words, a preliminary judgment is made in the hybrid mode first, and then an accurate judgment is made by entering the detection mode or positioning mode accordingly.

[0125] In positioning mode, the position of the digital key is detected. If in positioning mode, it is determined that the digital key has reached the outside of the car, it means that there is no one in the car. In this case, whether there is a living person in the car and the position of the digital key need to be detected, then switch to hybrid mode.

[0126] In the 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 the hybrid mode and continues to perform regular digital key positioning or in-car living person detection.

[0127] 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.

[0128] 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.

[0129] In one embodiment of the present application, the method further includes:

[0130] In the detection mode, the living conditions corresponding to the front row and / or the rear row of the vehicle are detected.

[0131] In this embodiment, illustratively, Figure 1 As shown, an ultra-wideband positioning detection anchor point is installed on the vehicle, and the ultra-wideband positioning detection anchor point can be installed relative to the front seats to perform liveness detection on the front seats, and can also be installed relative to the rear seats to perform liveness detection on the rear seats.

[0132] For example, Figure 2 As shown, two ultra-wideband positioning detection anchor points are installed on the vehicle, which are installed relative to the front seats and the rear seats respectively, and can simultaneously detect whether there are living people in the front and rear seats.

[0133] Through the above method, it is possible to reduce the number of UWB anchor points while ensuring accurate liveness detection for any seat.

[0134] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out 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 reverse 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.

[0135] 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 the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A positioning detection system, characterized in that: 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, characterized in that 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, characterized in that 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, characterized in that 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, characterized in that 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, characterized in that: 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, characterized in that 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, characterized in that 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, characterized in that: 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, characterized in that 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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