Ultra-wideband radar antenna switch array system, cockpit occupation detection device and carrier

Abstract

The utility model discloses an ultra-wideband radar antenna switch array system, a cockpit occupation detection device and a carrier, and belongs to the technical field of ultra-wideband. The ultra-wideband radar antenna switch array system comprises an ultra-wideband chip, a plurality of antennas and at least one single-pole multi-throw switch, the total number of the transmitting ports and the receiving ports included in the ultra-wideband chip is smaller than the number of the antennas; the non-common end of the single-pole multi-throw switch is connected with one transmitting port or one receiving port; and each common end of the single-pole multi-throw switch is connected with one antenna. According to the ultra-wideband radar antenna switch array system, the cockpit occupation detection device and the carrier disclosed by the application, different antenna groups are gated through the single-pole multi-throw switch, and combination of ultra-wideband antennas and the single-pole multi-throw switch is realized, so that a plurality of receiving-transmitting antenna groups perform transmitting and receiving in time, the space angle resolution capability can be improved, and the detection accuracy of the cockpit occupation detection device is improved. According to the invention, better angle resolution can be obtained, and occupation detection of more targets in a cabin can be more accurately carried out.

Description

Technical Field

[0001] The present application belongs to the field of ultra-wideband technology, and in particular relates to an ultra-wideband radar antenna switch array system, a cockpit occupancy detection device, and a vehicle. Background Art

[0002] Ultra-wideband (UWB) radar can be used to measure the position of objects within a certain distance, or to perceive the spatial information of a target. Therefore, UWB radar can be widely used in scenarios such as living body detection or target positioning.

[0003] The UWB chips used in current UWB radar antenna systems typically include one transmit port and no more than three receive ports. Each transmit port and each receive port can be connected to an antenna to transmit or receive signals. Existing UWB radar antenna systems are unable to detect or locate live objects on a large scale. Utility Model Content

[0004] This application aims to solve at least one of the technical problems existing in the prior art. To this end, this application proposes an ultra-wideband radar antenna switch array system, a cockpit occupancy detection device, and a vehicle, which can realize live occupancy detection of more targets.

[0005] In a first aspect, the present application provides an ultra-wideband radar antenna switch array system, the ultra-wideband radar antenna switch array system comprising: an ultra-wideband chip, multiple antennas, and at least one single-pole multi-throw switch; the total number of transmit ports and receive ports included in the ultra-wideband chip is less than the number of the antennas;

[0006] The non-common end of the single-pole multi-throw switch is connected to one of the transmitting ports or one of the receiving ports; and each common end of the single-pole multi-throw switch is connected to one of the antennas respectively.

[0007] According to the ultra-wideband radar antenna switch array system of the present application, different antenna groups are selected by a single-pole multi-throw switch, thereby realizing a combination of an ultra-wideband antenna and a single-pole multi-throw switch, so that multiple transmit-receive antenna groups can transmit and receive simultaneously. Without changing the circuit structure of the ultra-wideband chip or the relative position between the antenna arrays, the spatial angle resolution capability can be improved, better angle resolution can be obtained, and the occupancy detection of more targets in the cockpit can be performed more accurately.

[0008] According to one embodiment of the present application, each of the transmitting ports is connected to the non-common end of one of the single-pole multi-throw switches; and each of the receiving ports is connected to the non-common end of one of the single-pole multi-throw switches.

[0009] According to an embodiment of the present application, each of the transmitting ports is connected to a non-common end of the single-pole multi-throw switch; and each of the receiving ports is connected to an antenna.

[0010] According to an embodiment of the present application, each of the receiving ports is connected to a non-common end of the single-pole multi-throw switch; and each of the transmitting ports is connected to an antenna.

[0011] According to one embodiment of the present application, the multiple antennas include at least one transmitting antenna for transmitting signals and multiple receiving antennas for receiving signals;

[0012] The plurality of receiving antennas are arranged along a straight line;

[0013] When the number of the transmitting antennas is at least two, the plurality of transmitting antennas are arranged in a straight line.

[0014] According to an embodiment of the present application, the distance between two adjacent receiving antennas arranged on the first straight line is half the wavelength of the ultra-wideband signal.

[0015] According to one embodiment of the present application, when the number of the transmitting antennas is at least two, the distance between two adjacent transmitting antennas arranged on the second straight line is the product of half the wavelength of the ultra-wideband signal and the number of the receiving antennas arranged on the third straight line; the third straight line is parallel to the second straight line.

[0016] According to one embodiment of the present application, the single-pole multi-throw switch is a high-speed single-pole double-throw switch.

[0017] In a second aspect, the present application provides a cabin occupancy detection device, which is disposed in a cabin of a vehicle; the cabin occupancy detection device comprises: a detection module and the ultra-wideband radar antenna switch array system as described in the first aspect;

[0018] The detection module is used to detect whether there is a living body in the vehicle based on the ultra-wideband signal received and transmitted by the ultra-wideband radar antenna switch array system.

[0019] According to the cockpit occupancy detection device of the present application, different antenna groups are selected by a single-pole multi-throw switch, thereby realizing a combination of an ultra-wideband antenna and a single-pole multi-throw switch, so that multiple transmit-receive antenna groups transmit and receive simultaneously. Without changing the circuit structure of the ultra-wideband chip or the relative positions between the antenna arrays, the spatial angle resolution capability can be improved, a better angle resolution can be obtained, and the occupancy detection of more targets in the cockpit can be performed more accurately.

[0020] In a third aspect, the present application provides a vehicle, wherein a cabin occupancy detection device as described in the second aspect is provided in the cabin of the vehicle.

[0021] According to the vehicle of the present application, different antenna groups are selected by a single-pole multi-throw switch to realize the combination of an ultra-wideband antenna and a single-pole multi-throw switch, so that multiple transmit-receive antenna groups can transmit and receive at the same time. Without changing the circuit structure of the ultra-wideband chip or the relative position between the antenna arrays, the spatial angle resolution capability can be improved, better angle resolution can be obtained, and the occupancy detection of more targets in the cockpit can be performed more accurately.

[0022] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0024] Figure 1 This is one of the structural diagrams of the ultra-wideband radar antenna switch array system provided in an embodiment of the present application;

[0025] Figure 2 This is the second structural diagram of the ultra-wideband radar antenna switch array system provided in an embodiment of the present application;

[0026] Figure 3 This is the third structural diagram of the ultra-wideband radar antenna switch array system provided in an embodiment of the present application;

[0027] Figure 4 This is the fourth structural diagram of the ultra-wideband radar antenna switch array system provided in an embodiment of the present application;

[0028] Figure 5 This is one of the schematic diagrams of the actual antenna array elements and the formed virtual array elements of the ultra-wideband radar antenna switch array system provided in an embodiment of the present application;

[0029] Figure 6 This is a second schematic diagram of actual antenna array elements and formed virtual array elements of the ultra-wideband radar antenna switch array system provided in an embodiment of the present application;

[0030] Figure 7 This is a third schematic diagram of the actual antenna array elements and the formed virtual array elements of the ultra-wideband radar antenna switch array system provided in an embodiment of the present application;

[0031] Figure 8 This is one of the schematic diagrams of the control timing signals of a single-pole multi-throw switch in an ultra-wideband radar antenna switch array system provided in an embodiment of the present application;

[0032] Figure 9 This is a schematic diagram of direction-of-arrival signal reception for each array element of the ultra-wideband radar antenna switch array system provided in an embodiment of the present application;

[0033] Figure 10 This is a schematic diagram of a simulation structure of a beamforming algorithm applied to a virtual needle element of an ultra-wideband radar antenna switch array system provided in an embodiment of the present application;

[0034] Figure 11 This is a second schematic diagram of a control timing signal of a single-pole multi-throw switch in an ultra-wideband radar antenna switch array system provided in an embodiment of the present application;

[0035] Figure 12 is a structural diagram of a cabin occupancy detection device provided in an embodiment of the present application;

[0036] Figure 13 It is a structural schematic diagram of the carrier provided in an embodiment of the present application. DETAILED DESCRIPTION

[0037] 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.

[0038] 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.

[0039] In related technologies, to reduce or even prevent accidents resulting in casualties caused by children or pets being left behind in the cabin of vehicles such as cars, in-cabin liveness detection technology can be used to detect the presence of children or pets in the cabin. Among these, Life Presence Detection (LPD) technology, used in the cabin, is a commonly used in-cabin liveness detection technology. Common liveness occupancy detection technologies include those based on pressure sensors, millimeter-wave radars, cameras, or UWB radars.

[0040] Live occupancy detection technology based on pressure sensors detects whether objects weighing approximately the same as children or pets are left on seats within the cabin. However, this technology can easily misidentify heavy objects such as backpacks placed on seats as children or pets, resulting in a high false positive rate.

[0041] Millimeter-wave radar-based live occupancy detection technology uses millimeter-wave radar to detect live occupants in the cabin. Millimeter-wave radar offers advantages such as high frequency, small antenna size, and the ability to accurately detect the location of living individuals. However, it is expensive and can only be used for sensing, preventing the reuse of other functions to reduce costs.

[0042] Camera-based live occupancy detection technology uses optical images captured by cameras to detect whether children or pets are occupying seats. While this technology is mature and low-cost, it carries the risk of privacy violations and leaks when capturing optical images, as the cockpit is a private space. Furthermore, optical images can be easily obscured by objects such as blankets, leading to missed detections.

[0043] UWB radar-based live occupancy detection technology uses UWB radar to detect live occupants within the cabin. UWB technology is an emerging technology that integrates communication, sensing, and positioning functions. A single UWB chip can simultaneously perform multiple functions, including ranging and positioning within the cabin. Multiplexing can significantly reduce costs, making it highly practical. However, current UWB chips generally comply with the IEEE 802.15.4a / z protocol and typically include a relatively small number of transceiver ports, typically only two or so. While these UWB chips can meet the basic requirements for live occupancy detection within the cabin, their limited coverage area makes it impossible to simultaneously detect multiple targets within the cabin and accurately output their locations. This means it cannot locate the specific locations of multiple targets, making it difficult to effectively rescue and alleviate the vital signs of trapped children and pets when multiple children and pets are left behind in the cabin.

[0044] The following, in conjunction with the accompanying drawings, describes in detail the ultra-wideband radar antenna switch array system, the cabin occupancy detection device, and the vehicle provided in the embodiments of the present application through specific embodiments and their application scenarios.

[0045] like Figures 1 to 4As shown, an ultra-wideband radar antenna switch array system includes: an ultra-wideband chip 110, multiple antennas 120 and at least one single-pole multi-throw switch 130; the total number of transmitting ports 140 and receiving ports 150 included in the ultra-wideband chip 110 is less than the number of antennas; the non-common end of the single-pole multi-throw switch 130 is connected to one transmitting port 140 or one receiving port 150; and each common end of the single-pole multi-throw switch 130 is connected to one antenna 120.

[0046] In actual implementation, the ultra-wideband radar antenna switch array system can be primarily composed of an ultra-wideband chip 110, multiple antennas 120, one or more single-pole, multi-throw switches 130, and other related modules. The ultra-wideband radar antenna switch array system can be used for multi-target live occupancy detection in a cockpit.

[0047] A single-pole, multi-throw switch 130 can be used to connect a transmitting port 140 or a receiving port 150 of the ultra-wideband chip 110 to multiple antennas 120, thereby multiplexing the transmitting port 140 and / or receiving port 150 of the ultra-wideband chip 110 to increase the number of signal transceiver channels of the ultra-wideband chip 110. This allows the existing ultra-wideband chip to be used to detect the occupancy of more targets in the cabin.

[0048] In some embodiments, the ultra-wideband chip 110 can be any commonly used UWB chip. In some embodiments, the ultra-wideband chip 110 can be a chip that complies with the IEEE 802.15.4a / z protocol. For example, the ultra-wideband chip 110 can be a 1T3R UWB chip, a 1T1R UWB chip, or a 2T2R UWB chip, etc. Wherein, T and R represent transmission and reception, respectively. Accordingly, the numbers before T and R represent the number of transmit ports and receive ports of the UWB chip, respectively. Therefore, a 1T3R UWB chip, a 1T1R UWB chip, or a 2T2R UWB chip are respectively a UWB chip including one transmit port and three receive ports, a UWB chip including one transmit port and one receive port, and a UWB chip including two transmit ports and two receive ports.

[0049] The SPMT switch 130 includes a non-common terminal and multiple common terminals. Depending on the number of common terminals, any SPMT switch 130 can be a single-pole double-throw (SPDT) switch, a single-pole triple-throw (SPTT) switch, a single-pole four-throw (SP4T) switch, or a single-pole eight-throw (SP8T) switch.

[0050] In some embodiments, the SPMT switch 130 may be any existing SPMT switch. The specific type and model of the SPMT switch 130 are not limited in the embodiments of the present application.

[0051] In some embodiments, the SPMT switch 130 may be an electronic device implemented as a transistor. The transistor may include a diode, a triode, or a field-effect transistor. For example, the SPMT switch 130 may be an integrated circuit including at least one of a diode, a triode, and a field-effect transistor.

[0052] In some embodiments, for any SPMT switch 130, the non-common end of the SPMT switch 130 can be connected to a transmit port 140 of the UWB chip 110, or to a receive port 150 of the UWB chip 110; and any common end of the SPMT switch 130 can be connected to an antenna 120. Each antenna 120 can be connected to a common end of a SPMT switch 130, or directly connected to a transmit port 140 of the UWB chip 110, or directly connected to a receive port 150 of the UWB chip 110.

[0053] In some embodiments, the SPMT switch 130 can be controlled to sequentially enable each common terminal of the SPMT switch 130 at a preset time interval to multiplex the transmitting port 140 and / or receiving port 150 of the UWB chip 110 .

[0054] In some embodiments, the SPMT switch 130 may be controlled based on a digital control method to sequentially enable each common terminal of the SPMT switch 130 at a preset time interval.

[0055] In some embodiments, any transmitting port 140 of the ultra-wideband chip 110 may be directly connected to an antenna 120 , or connected to a non-common end of a single-pole multi-throw switch 130 .

[0056] In some embodiments, any receiving port 150 of the ultra-wideband chip 110 may be directly connected to an antenna 120 , or connected to a non-common end of a single-pole multi-throw switch 130 .

[0057] It should be noted that the two transmit ports 140 are not connected to the non-common terminal of the same single-pole multi-throw switch 130, nor are they directly connected to the same antenna 120. The two receive ports 150 are not connected to the non-common terminal of the same single-pole multi-throw switch 130, nor are they directly connected to the same antenna 120. One transmit port 140 and one receive port 150 are not connected to the non-common terminal of the same single-pole multi-throw switch 130, nor are they directly connected to the same antenna 120.

[0058] It is understood that each antenna 120 is a UWB antenna. In some embodiments, each antenna 120 can be directly connected to a transmitting port 140 , a receiving port 150 , or a common terminal of a single-pole multi-throw switch 130 .

[0059] It should be noted that the two antennas 120 are not connected to the same common terminal of the same single-pole multi-throw switch 130 , are not directly connected to the same transmitting port 140 , and are not directly connected to the same receiving port 150 .

[0060] In some embodiments, as Figure 1 As shown, the ultra-wideband chip 110 in an ultra-wideband radar antenna switch array system is a 1T3R UWB chip. The four single-pole multi-throw switches 130 included in the ultra-wideband radar antenna switch array system are all SPDT switches. The ultra-wideband radar antenna switch array system includes eight antennas 120, thereby forming a 2T6R time division multiple-input multiple output (TDM-MIMO) antenna switch array.

[0061] Two of the eight antennas 120 are used to transmit UWB signals, and the remaining six are used to receive UWB signals. The two antennas 120 used to transmit UWB signals can be referred to as transmit antennas or TX antennas, while the two antennas 120 used to receive UWB signals can be referred to as receive antennas or RX antennas. The two TX antennas are connected to the same transmit port of the UWB chip 110 via a single-pole double-throw switch. The six RX antennas are grouped in groups of two and connected to the three receive ports of the UWB chip 110 via three single-pole double-throw switches.

[0062] It should be noted that, based on MIMO virtual aperture technology, the ultra-wideband radar antenna switch array system can generate 12 MIMO virtual apertures.

[0063] In some embodiments, as Figure 2 As shown, the ultra-wideband chip 110 in an ultra-wideband radar antenna switch array system is a 1T3R UWB chip, the three single-pole multi-throw switches 130 included in the ultra-wideband radar antenna switch array system are all SPDT switches, and the ultra-wideband radar antenna switch array system includes seven antennas 120, thereby forming a 1T6R TDM-MIMO antenna switch array.

[0064] One of the seven antennas 120 is used to transmit UWB signals, and the other six are used to receive UWB signals. The single antenna 120 used to transmit UWB signals can be referred to as a transmitting antenna or TX antenna, and the two antennas 120 used to receive UWB signals can be referred to as receiving antennas or RX antennas. The single TX antenna can be directly connected to the transmit port of the ultra-wideband chip 110, while the six RX antennas are grouped in groups of two and connected to the three receive ports of the ultra-wideband chip 110 via three single-pole double-throw switches.

[0065] It should be noted that, based on MIMO virtual aperture technology, the ultra-wideband radar antenna switch array system can generate 6 MIMO virtual apertures.

[0066] In some embodiments, as Figure 3 As shown, the ultra-wideband chip 110 in an ultra-wideband radar antenna switch array system is a 1T3R UWB chip, the ultra-wideband radar antenna switch array system includes a single-pole multi-throw switch 130 that is an SPDT switch, and the ultra-wideband radar antenna switch array system includes five antennas 120, thereby forming a 2T3R TDM-MIMO antenna switch array.

[0067] Two of the five antennas 120 are used to transmit UWB signals, and the other three are used to receive UWB signals. The two antennas 120 used to transmit UWB signals can be referred to as transmit antennas or TX antennas, and the three antennas 120 used to receive UWB signals can be referred to as receive antennas or RX antennas. The two TX antennas are connected to the same transmit port of the ultra-wideband chip 110 via a single-pole double-throw switch, while the three RX antennas can be directly connected to the three receive ports of the ultra-wideband chip 110.

[0068] It should be noted that, based on MIMO virtual aperture technology, the ultra-wideband radar antenna switch array system can generate 6 MIMO virtual apertures.

[0069] In some embodiments, as Figure 4 As shown, an ultra-wideband chip 110 in an ultra-wideband radar antenna switch array system is a 1T3R UWB chip. The four 130 included in the ultra-wideband radar antenna switch array system are one SPTT switch and three SPDT switches. The ultra-wideband radar antenna switch array system includes nine antennas 120, thereby forming a 3T6R TDM-MIMO antenna switch array.

[0070] Three of the nine antennas 120 are used to transmit UWB signals, and the remaining six are used to receive UWB signals. The three antennas 120 used to transmit UWB signals can be referred to as transmit antennas, or TX antennas, while the six antennas 120 used to receive UWB signals can be referred to as receive antennas, or RX antennas. The three TX antennas are connected to the same transmit port of the ultra-wideband chip 110 via a single-pole, triple-throw switch. The six RX antennas, grouped in groups of two, are connected to the three receive ports of the ultra-wideband chip 110 via three single-pole, double-throw switches.

[0071] It should be noted that, based on MIMO virtual aperture technology, the ultra-wideband radar antenna switch array system can generate 14 MIMO virtual apertures.

[0072] It should be noted that the embodiments of this application do not limit the specific arrangement of the transmitting antennas or the receiving antennas of the ultra-wideband radar antenna switch array system. For example, the transmitting antennas of the ultra-wideband radar antenna switch array system may be arranged in a straight line or a curved line. For another example, the receiving antennas of the ultra-wideband radar antenna switch array system may be arranged in a straight line or in an array.

[0073] It should be noted that the embodiments of this application do not limit the distance between the transmitting antennas or the receiving antennas of the ultra-wideband radar antenna switch array system. In some embodiments, for any transmitting antenna, the distance between the transmitting antenna and the nearest other transmitting antenna can be 0.125 to 1 wavelength, for example. In some embodiments, for any receiving antenna, the distance between the transmitting antenna and the nearest other receiving antenna can be 0.125 to 1 wavelength, for example.

[0074] In actual implementation, the SPMT switch 130 can be controlled to sequentially enable each common terminal of the SPMT switch 130 at a preset time interval to multiplex the transmitting port 140 and / or receiving port 150 of the UWB chip 110 .

[0075] The aforementioned ultra-wideband radar antenna switch array system can be used for cabin occupancy detection. Compared to related ultra-wideband radar antenna switch array systems, the ultra-wideband radar antenna switch array system provided in this embodiment can improve angular resolution by increasing the antenna aperture. The antenna aperture can be the aforementioned MIMO virtual aperture.

[0076] The angular resolution of the ultra-wideband radar antenna switch array system can be expressed as follows:

[0077]

[0078] Among them, θ res represents the angular resolution of the UWB radar antenna switch array system (in radians); lambda represents the wavelength of the UWB signal, N represents the number of receiving channels; d RX represents the interval of the receiving channel; θ represents the direction of the incoming wave.

[0079] It should be noted that a transmitting port 140 and a receiving port 150 cooperate to form a MIMO virtual aperture. Each MIMO virtual aperture can serve as a receiving channel.

[0080] In some embodiments, the interval between receiving channels is half a wavelength (ie, lambda / 2), the incoming wave direction is 0, and the optimal angular resolution may be 2 / N (in radians).

[0081] The relationship between the number of receiving channels and the angular resolution of the ultra-wideband radar antenna switch array system can be shown in Table 1.

[0082] Table 1 Relationship between the number of receiving channels and angular resolution

[0083] Number of receiving channels Angular resolution / ° 3 38.2 6 19.1 12 9.55

[0084] In some embodiments, taking a typical vehicle as an example, the distance between the front and rear seats is approximately 1.5m-2m, and the rear seats are generally about 1.5m long. Therefore, for the ultra-wideband radar antenna switch array system, there is an angular difference of approximately 10°-20° between the center position and the side position of the rear seat. In order to achieve accurate occupancy detection of multiple targets in the vehicle cabin, the angular resolution of the ultra-wideband radar antenna switch array system needs to be at least better than (less than or equal to) 20° in the embodiment of the present application. According to Table 1, at least 6 receiving channels are required to achieve an angular resolution of at least better than 20°.

[0085] Figures 5 to 7 They are shown as Figures 1 to 3 The ultra-wideband radar antenna switch array system shown includes actual antenna array elements formed by all antennas 120 and virtual array elements formed by multiplexing single-pole, multi-throw switches 130. Each antenna 120 can serve as an actual antenna array element. Among all actual antenna array elements, each antenna 120 used to transmit UWB signals can serve as an actual transmitting array element, and each antenna 120 used to receive UWB signals can serve as an actual receiving array element. A virtual array element can be formed based on MIMO virtual aperture technology, and each virtual aperture can be formed based on different virtual array elements. Asterisks represent virtual array elements; circles represent actual transmitting array elements; and diamonds represent actual receiving array elements.

[0086] In some embodiments, the carrier frequency of the ultra-wideband chip 110 is 8 GHz, that is, the frequency of the UWB signal used by the ultra-wideband chip 110 is 8 GHz, and accordingly, the wavelength of the UWB signal is 3.75 cm. Figure 5 As shown in , the actual distance between the transmitting array elements can be 11.25 cm, the total length of the array formed by the receiving array elements can be 9.375 cm, and the angular resolution is improved to 9.55°. Figure 6 As shown in FIG, the total length of the array formed by the receiving array elements can be 9.375 cm, and the angular resolution is improved to 19.1°. Figure 7 As shown, the actual distance between the transmitting array elements can be 5.625 cm, the total length of the array formed by the receiving array elements can be 3.75 cm, and the angular resolution is improved to 19.1°.

[0087] Based on the ultra-wideband radar antenna switch array system provided in the embodiment of the present application, TDM-MIMO technology can be used in combination with a single-pole multi-throw switch to generate a MIMO virtual antenna array; then, cabin occupancy detection can be performed based on the MIMO virtual antenna array.

[0088] The following is Figure 1 Taking the ultra-wideband radar antenna switch array system shown as an example, the process of using the ultra-wideband radar antenna switch array system to perform cockpit occupancy detection is explained.

[0089] In some embodiments, the SPDT switch can be controlled by a Transistor-Transistor Logic (TTL) signal from within the chip.

[0090] Figure 1 The six RX antennas in the figure can be labeled RX1, RX2, RX3, RX4, RX5, and RX6 from left to right. RX1, RX2, and RX3 can be set as the RX-1 group, and RX4, RX5, and RX6 can be set as the RX-2 group. Figure 1 The two TX antennas in the figure can be denoted as TX1 and TX2 from left to right. The waveform of the TTL signal used to control the SPDT switches of TX1, TX2, RX-1 group and RX-2 group can be as follows: Figure 8 shown.

[0091] In actual implementation, the switching speed of the SPDT switch needs to be considered, so the switching period T of the SPMT switch 130 is greater than the packet transmission period. In some embodiments, the switching period T can be much greater than the sum of the duration of a packet signal and the maximum delay of the echo.

[0092] For the signal received by the aforementioned MIMO virtual antenna array implemented by time division multiplexing technology, Doppler phase offset compensation may be performed first due to the Doppler effect to ensure a correct estimation of the angle.

[0093] The target speed is V r The Doppler frequency shift Δf and phase offset generated by the target They are:

[0094] Among them, f c Indicates the carrier frequency of the UWB chip; lambda indicates the wavelength of the UWB signal; T c Indicates the duration of a packet of signal.

[0095] The ultra-wideband chip 110 is a UWB chip using 1T3R. The ultra-wideband chip 110 and the time-sharing multiple antenna groups composed of multiple SPDT switches are different. Before angle estimation, the phase offset is compensated based on one of the antenna groups as a reference.

[0096] Angle estimation is achieved by calculating the phase difference between different receiving channels. In some embodiments, a CAPON beamforming (also known as beamforming) algorithm can be used on the signals received by the MIMO virtual antenna array to detect the occupancy of multiple targets in the cabin.

[0097] like Figure 9 As shown, the spacing between adjacent virtual array elements is d = lambda / 2, and the direction of the incoming wave is θ. Therefore, the arrival distance difference of the signal between adjacent virtual array elements is dsin (θ). The baseband echo signal after mixing is s(t), and the signal s(t) can be expressed as s(t) = (s1(n), s2(n), ..., s N (n)), the signal received by the MIMO virtual antenna array can be expressed as x(t) = A(θ)*s(t) + n(t). Where A(θ) = (a(θ1), ..., a(θ M )) is the steering matrix; a(θ)=(0e j2πd sin(θ) ,...,e j2π(N-1)d sin(θ) ) H is the steering vector; M represents the number of targets; N represents the number of virtual array elements; n(t) represents Gaussian white noise.

[0098] The basic idea of ​​the CAPON beamforming algorithm is to design a weight matrix W so that the signal from the incoming direction θ1 is completely passed, while the signals and noise from other incoming directions are suppressed. Therefore, the output signal y(n) can be expressed as: y(n) = wH x(n), the power of the output signal is P = E[|y(n)| 2 = E[w H x(n)x(n) H w] = w H Rw. Separating the incident wave direction signal s1(n) and the remaining signals z(n), we can obtain: y(n) = w H x(n) = y(n) = w H a(θ1)s1(n) + w H z(n). Based on the above formula, only when w H a(θ1) = 1 and P = x(n)x(n) H = w H Rw is minimized can the goal of maximizing the signal in the incident wave direction θ1 and minimizing the signals and noises in other incident wave directions be achieved.

[0099] Generalizing to the general case, the core requirement of the CAPON beamforming algorithm is minw H Rw, st. w H a(θ) = 1.

[0100] In some embodiments, the Lagrange multiplier method can be used to construct the cost function J(w) = w H Rw - γ(1 - w H a(θ)). By solving, we can obtain w = γR -1 a(θ). Using the constraint condition w H a(θ) = 1, we can obtain

[0101] According to the constructed steering vector <000​​​​​​​​​​​​​​​​​​​​​​​​ Figure 11 Shows that for Figure 4 The waveforms of the TTL signals of the SPDT switches of TX1, TX2, TX3, RX-1 group and RX-2 group in the ultra-wideband radar antenna switch array system are shown. Figure 11 The two vertically arranged TX antennas can be recorded as TX1 and TX2 from top to bottom, and the other TX antenna can be recorded as TX3; the three vertically arranged RX antennas can be set as the RX-1 group, and recorded as RX1, RX2, and RX3 from top to bottom; the other three RX antennas can be set as the RX-2 group, and recorded as RX4, RX5, and RX6 from left to right.

[0106] It is understood that in the above process, the ultra-wideband chip 110 senses targets within the cabin, effectively acquiring information such as the target's distance, speed, and direction, thereby enabling multi-target cabin occupancy detection. Furthermore, this multi-target cabin occupancy detection solution offers advantages such as low cost, wide coverage, high accuracy, and excellent confidentiality.

[0107] It should be noted that by designing the directional patterns of each antenna 120 and reusing the same set of antenna switch arrays, the digital key function based on ultra-wideband technology and the cabin liveness detection function can be realized. For example, by realizing the reuse of UWB radar mode and communication mode in the vehicle-mounted scenario, it is helpful to reduce the number of ultra-wideband chips used, save costs and improve work efficiency at the same time. In some embodiments, the position of the ultra-wideband radar antenna switch array system can be reasonably deployed and combined with other design schemes to realize multiplexing ranging and angle measurement based on AOA (Angle-of-Arrival) to realize the digital key function. The cost can be greatly reduced by reusing the ultra-wideband chip 110, which has high application value.

[0108] According to the ultra-wideband radar antenna switch array system provided in the embodiment of the present application, a single-pole multi-throw switch is used to select different antenna groups, thereby realizing a combination of an ultra-wideband antenna and a single-pole multi-throw switch, so that multiple transmit-receive antenna groups can transmit and receive simultaneously. Without changing the circuit structure of the ultra-wideband chip or the relative positions between the antenna arrays, the spatial angle resolution capability can be improved, better angle resolution can be obtained, and the occupancy detection of more targets in the cabin can be performed more accurately.

[0109] In some embodiments, each transmitting port 140 is connected to the non-common terminal of a single-pole multi-throw switch 130 ; each receiving port 150 is connected to the non-common terminal of a single-pole multi-throw switch 130 .

[0110] In actual implementation, each transmitting port 140 and each receiving port 150 of the ultra-wideband chip 110 may be multiplexed.

[0111] For each transmission port 140 of the UWB chip 110 , the transmission port 140 may be connected to a non-common terminal of a single-pole multi-throw switch 130 , and the common terminal of the single-pole multi-throw switch 130 may be connected to an antenna 120 .

[0112] For each receiving port 150 of the UWB chip 110 , the receiving port 150 may be connected to a non-common terminal of a SPMT switch 130 , and the common terminal of the SPMT switch 130 may be connected to an antenna 120 .

[0113] According to the ultra-wideband radar antenna switch array system provided in the embodiments of the present application, a single-pole, multi-throw switch is used to select different antenna groups, thereby realizing a combination of an ultra-wideband antenna and a single-pole, multi-throw switch. This allows multiple transmit-receive antenna groups to transmit and receive simultaneously, expanding the transmit ports and receive ports of the ultra-wideband chip. Without changing the circuit structure of the ultra-wideband chip or the relative positions between the antenna arrays, the spatial angle resolution capability can be improved, better angle resolution can be obtained, and the occupancy detection of more targets in the cabin can be performed more accurately.

[0114] In some embodiments, each transmitting port 140 is connected to a non-common terminal of a single-pole multi-throw switch 130 ; and each receiving port 150 is connected to an antenna 120 .

[0115] In actual implementation, each transmitting port 140 of the ultra-wideband chip 110 may be multiplexed, but each receiving port 150 of the ultra-wideband chip 110 may not be multiplexed.

[0116] For each transmission port 140 of the UWB chip 110 , the transmission port 140 may be connected to a non-common terminal of a single-pole multi-throw switch 130 , and the common terminal of the single-pole multi-throw switch 130 may be connected to an antenna 120 .

[0117] For each receiving port 150 of the UWB chip 110 , the receiving port 150 may be directly connected to one antenna 120 .

[0118] According to the ultra-wideband radar antenna switch array system provided in the embodiment of the present application, a single-pole multi-throw switch is used to select different antenna groups, thereby realizing a combination of an ultra-wideband antenna and a single-pole multi-throw switch. This allows multiple transmit-receive antenna groups to transmit and receive simultaneously, expanding the transmit ports of the ultra-wideband chip. Without changing the circuit structure of the ultra-wideband chip or the relative positions between the antenna arrays, the spatial angle resolution capability can be improved, better angle resolution can be obtained, and the occupancy detection of more targets in the cockpit can be performed more accurately.

[0119] In some embodiments, each receiving port 150 is connected to a non-common terminal of a single-pole multi-throw switch 130 ; and each transmitting port 140 is connected to an antenna 120 .

[0120] In actual implementation, each receiving port 150 of the ultra-wideband chip 110 may be multiplexed, but each transmitting port 140 of the ultra-wideband chip 110 may not be multiplexed.

[0121] For each receiving port 150 of the UWB chip 110 , the receiving port 150 may be connected to a non-common terminal of a SPMT switch 130 , and the common terminal of the SPMT switch 130 may be connected to an antenna 120 .

[0122] For each transmit port 140 of the ultra-wideband chip 110 , the transmit port 140 may be directly connected to one antenna 120 .

[0123] According to the ultra-wideband radar antenna switch array system provided in the embodiments of the present application, a single-pole, multi-throw switch is used to select different antenna groups, thereby realizing a combination of an ultra-wideband antenna and a single-pole, multi-throw switch. This allows multiple transmit-receive antenna groups to transmit and receive simultaneously, expanding the receiving ports of the ultra-wideband chip. Without changing the circuit structure of the ultra-wideband chip or the relative positions between the antenna arrays, the spatial angle resolution capability can be improved, better angle resolution can be obtained, and the occupancy detection of more targets in the cockpit can be performed more accurately.

[0124] In some embodiments, the plurality of antennas 120 includes at least one transmit antenna for transmitting signals and a plurality of receive antennas for receiving signals.

[0125] In actual implementation, each antenna 120 can be used to receive or transmit UWB signals. Depending on whether the antenna 120 is used to receive or transmit UWB signals, all antennas 120 included in the ultra-wideband radar antenna switch array system can be divided into two categories: transmitting antennas and receiving antennas. Antennas 120 used to transmit UWB signals are called transmitting antennas, or TX antennas; antennas 120 used to receive UWB signals are called receiving antennas, or RX antennas.

[0126] In some embodiments, among all antennas 120 included in the ultra-wideband radar antenna switch array system, at least one antenna 120 may be a transmitting antenna, and at least two antennas 120 may be receiving antennas.

[0127] Multiple receiving antennas are arranged along a straight line.

[0128] In actual implementation, all receiving antennas included in the ultra-wideband radar antenna switch array system can be arranged on one or more straight lines, and each straight line can be provided with more than or equal to two receiving antennas.

[0129] In some embodiments, all receiving antennas may be arranged in a straight line.

[0130] In some embodiments, all receiving antennas may be arranged on two mutually perpendicular straight lines, with a receiving antenna disposed at the intersection of the two straight lines. In some embodiments, the two straight lines may both start at the intersection of the two straight lines.

[0131] When the number of transmitting antennas is at least two, the plurality of transmitting antennas are arranged in a straight line.

[0132] In actual implementation, when the number of transmit antennas included in the ultra-wideband radar antenna switch array system is greater than or equal to two, all transmit antennas included in the ultra-wideband radar antenna switch array system can be arranged on one or more straight lines. Each of the above straight lines can be provided with greater than or equal to two transmit antennas.

[0133] In some embodiments, when the number of transmit antennas is greater than or equal to two, all transmit antennas may be arranged in a straight line.

[0134] In some embodiments, when the number of transmitting antennas is greater than or equal to two, all transmitting antennas may be arranged on two mutually perpendicular lines, with one transmitting antenna positioned at the intersection of the two lines. In some embodiments, the two lines may both start at the intersection of the two lines.

[0135] In some embodiments, when the number of transmitting antennas is greater than or equal to two, the arrangement of the transmitting antennas can correspond to the arrangement of the receiving antennas. For example, when all receiving antennas are arranged in a straight line, all transmitting antennas are also arranged in a straight line, and the two straight lines are parallel. For another example, when all receiving antennas are arranged in two mutually perpendicular straight lines as described above, all transmitting antennas are also arranged in two mutually perpendicular straight lines as described above, with one straight line for the receiving antennas being parallel to one straight line for the transmitting antennas, and another straight line for the receiving antennas being parallel to another straight line for the transmitting antennas.

[0136] For example, reference Figure 1 , 6 RX antennas can be arranged in a horizontal straight line, and 2 TX antennas can be arranged in a horizontal straight line; refer to Figure 2 , 6 RX antennas can be arranged in a horizontal straight line; refer to Figure 3 , 3 RX antennas can be arranged in a horizontal straight line, and 2 TX antennas can be arranged in a horizontal straight line; refer to Figure 4 , the 6 RX antennas are arranged in a vertical straight line and a horizontal straight line respectively, and the 3 TX antennas are arranged in a vertical straight line and a horizontal straight line respectively.

[0137] According to the ultra-wideband radar antenna switch array system provided in the embodiment of the present application, by arranging the receiving antennas along a straight line and the transmitting antennas along a straight line, the spatial angle resolution capability can be improved, better angular resolution can be obtained, and the occupancy detection of more targets in the cabin can be performed more accurately.

[0138] In some embodiments, the distance between two adjacent receiving antennas arranged on the first straight line is half the wavelength of the ultra-wideband signal.

[0139] In actual implementation, the first straight line may be any straight line where multiple receiving antennas are arranged. For the first straight line, the receiving antennas may be arranged at equal intervals, with the interval being half the wavelength of the ultra-wideband signal.

[0140] For example, reference Figure 1 , the distance between two adjacent RX antennas in the 6 RX antennas can be λ / 2; Figure 2 , the distance between two adjacent RX antennas in the three RX antennas can be λ / 2; Figure 3 , the distance between two adjacent RX antennas in the 6 RX antennas can be λ / 2; Figure 4 The distance between two adjacent RX antennas in the three vertically arranged RX antennas may be λ / 2, and the distance between two adjacent RX antennas in the four horizontally arranged RX antennas may be λ / 2; where λ represents the wavelength of the UWB signal.

[0141] According to the ultra-wideband radar antenna switch array system provided in the embodiment of the present application, by ensuring that the distance between two adjacent receiving antennas arranged on a first straight line is half the wavelength of the ultra-wideband signal, the mutual coupling effect between the receiving antennas and the beam pattern distortion caused by the positions of the receiving antennas can be effectively reduced, thereby improving the accuracy of cabin occupancy detection applied to multiple targets.

[0142] In some embodiments, when the number of transmitting antennas is at least two, the distance between two adjacent transmitting antennas arranged on the second straight line is the product of half the wavelength of the ultra-wideband signal and the number of receiving antennas arranged on the third straight line; the third straight line is parallel to the second straight line.

[0143] In actual implementation, when there are at least two transmitting antennas, the distance between two adjacent transmitting antennas arranged on a straight line can be determined according to the wavelength of the ultra-wideband signal and the number of receiving antennas arranged on the corresponding straight line.

[0144] In some embodiments, the distance between two adjacent transmitting antennas arranged on a straight line may be equal to half the wavelength of the ultra-wideband signal multiplied by the number of receiving antennas arranged on the corresponding straight line, which is parallel to the straight line on which the transmitting antennas are arranged.

[0145] For example, reference Figure 1 , two TX antennas can be arranged on a horizontal straight line, which is the second straight line; six RX antennas can be arranged on a horizontal straight line, which is the corresponding third straight line. It can be understood that the second straight line and the third straight line are both horizontal and therefore parallel. The distance between two adjacent RX antennas among the six RX antennas can be λ / 2, and the distance between two TX antennas can be 3λ = (λ / 2) × 6. Here, λ represents the wavelength of the UWB signal.

[0146] For example, refer to Figure 3 The two TX antennas can be arranged on a straight horizontal line, referred to as the second straight line; the three RX antennas can be arranged on a straight horizontal line, referred to as the corresponding third straight line. It is understood that the second straight line and the third straight line are both horizontal and therefore parallel. The distance between two adjacent RX antennas can be λ / 2, and the distance between the two TX antennas can be 1.5λ = (λ / 2) × 3. Here, λ represents the wavelength of the UWB signal.

[0147] For example, refer to Figure 4, two TX antennas are arranged on a vertical straight line, which can be the second straight line. Correspondingly, the straight line with three RX antennas arranged vertically is the corresponding third straight line. It can be understood that the second straight line and the third straight line are both vertical, and therefore parallel. The distance between two adjacent RX antennas in the three vertically arranged RX antennas can be λ / 2, and the distance between the two vertically arranged TX antennas can be 1.5λ = (λ / 2) × 3. In addition, two TX antennas are arranged on a horizontal straight line, which can also be the second straight line. Correspondingly, the straight line with four horizontally arranged RX antennas is the corresponding third straight line. It can be understood that the second straight line and the third straight line are both horizontal, and therefore parallel. The distance between two adjacent RX antennas in the four horizontally arranged RX antennas can be λ / 2, and the distance between the two horizontally arranged TX antennas can be 2λ = (λ / 2) × 4.

[0148] It can be understood that, in any of the above-mentioned ultra-wideband radar antenna switch array systems, the distance between the antenna group consisting of all TX antennas and the antenna group consisting of all RX antennas meets the isolation requirement.

[0149] According to the ultra-wideband radar antenna switch array system provided in the embodiments of the present application, by ensuring that the distance between two adjacent transmitting antennas arranged on the second straight line is equal to half the wavelength of the ultra-wideband signal multiplied by the number of receiving antennas arranged on the third straight line, the mutual coupling effect between the transmitting antennas and the beam pattern distortion caused by the positions of the transmitting antennas can be effectively reduced, thereby improving the accuracy of cabin occupancy detection applied to multiple targets.

[0150] In some embodiments, the SPMT switch 130 is a high-speed SPDT switch.

[0151] In actual implementation, the SPMT switch 130 may be a high-speed SPDT switch, which has a high switching speed between two common terminals and can quickly switch the non-common terminal to be connected to the two common terminals.

[0152] According to the ultra-wideband radar antenna switch array system provided in the embodiment of the present application, the use of a high-speed single-pole double-throw switch in a single-pole multi-throw switch can reduce the time consumed by the single-pole multi-throw switch to select different antenna groups, thereby improving the real-time and accuracy of cockpit occupancy detection applied to multiple targets.

[0153] The present application also provides a cabin occupancy detection device. The cabin occupancy detection device can be set in the cabin of a vehicle. Figure 12 The cabin occupancy detection device may include: a detection module 1210 and an ultra-wideband radar antenna switch array system 1220.

[0154] In actual implementation, the cabin occupancy detection device may primarily include a detection module 1210 and an ultra-wideband radar antenna switch array system 1220. Detection module 1210 may be electrically connected to ultra-wideband radar antenna switch array system 1220. Ultra-wideband radar antenna switch array system 1220 may be any of the aforementioned embodiments of the present application.

[0155] In some embodiments, the detection module 1210 may be electrically connected to an ultra-wideband chip in the ultra-wideband radar antenna switch array system 1220 .

[0156] The detection module 1210 is used to detect whether there is a living body in the vehicle based on the ultra-wideband signal received and transmitted by the ultra-wideband radar antenna switch array system 1220.

[0157] In actual implementation, the cabin occupancy detection device can be installed in the vehicle's cabin. The detection module 1210 can process the ultra-wideband signals received and transmitted by the ultra-wideband radar antenna switch array system 1220 based on the aforementioned CAPON beamforming algorithm or other digital beamforming (DBF) algorithms, thereby performing live occupancy detection in the cabin to detect whether a living person is occupying a seat within the cabin.

[0158] According to the cockpit occupancy detection device provided in the embodiment of the present application, different antenna groups are selected by a single-pole multi-throw switch, thereby realizing a combination of an ultra-wideband antenna and a single-pole multi-throw switch, so that multiple transmit-receive antenna groups transmit and receive simultaneously. Without changing the circuit structure of the ultra-wideband chip or the relative positions between the antenna arrays, the spatial angle resolution capability can be improved, a better angle resolution can be obtained, and the occupancy detection of more targets in the cockpit can be performed more accurately.

[0159] The present application also provides a vehicle. Figure 13 A cabin occupancy detection device 1320 is provided in the cabin 1310 of the vehicle 1300 .

[0160] In actual implementation, the vehicle 1300 may include a cabin 1310 and a cabin occupancy detection device 1320. The cabin occupancy detection device 1320 may be disposed in the cabin 1310. The cabin occupancy detection device 1320 may be the cabin occupancy detection device provided in any of the aforementioned embodiments of the present application.

[0161] In some embodiments, the vehicle 1300 may be, but is not limited to, various types of vehicles such as cars, ships, or airplanes.

[0162] In some embodiments, the above-mentioned car can be a fuel car, an electric vehicle (EV) or a hybrid electric vehicle (HEV).

[0163] According to the vehicle provided in the embodiment of the present application, different antenna groups are selected by a single-pole multi-throw switch to realize the combination of an ultra-wideband antenna and a single-pole multi-throw switch, so that multiple transmit-receive antenna groups can transmit and receive at the same time. Without changing the circuit structure of the ultra-wideband chip or the relative position between the antenna arrays, the spatial angle resolution capability can be improved, better angular resolution can be obtained, and the occupancy detection of more targets in the cabin can be performed more accurately.

[0164] 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.

[0165] 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.

[0166] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0167] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. An ultra-wideband radar antenna switch array system, characterized in that: include: An ultra-wideband chip, multiple antennas, and at least one single-pole multi-throw switch; the total number of transmitting ports and receiving ports included in the ultra-wideband chip is less than the number of the antennas; The non-common end of the single-pole multi-throw switch is connected to one of the transmitting ports or one of the receiving ports; Each common end of the single-pole multi-throw switch is connected to one of the antennas.

2. The ultra-wideband radar antenna switch array system according to claim 1, characterized in that: Each of the transmitting ports is connected to the non-common end of a single-pole multi-throw switch; each of the receiving ports is connected to the non-common end of a single-pole multi-throw switch.

3. The ultra-wideband radar antenna switch array system according to claim 1, characterized in that: Each of the transmitting ports is connected to a non-common end of the single-pole multi-throw switch; each of the receiving ports is connected to an antenna.

4. The ultra-wideband radar antenna switch array system according to claim 1, characterized in that: Each of the receiving ports is connected to a non-common end of the single-pole multi-throw switch; and each of the transmitting ports is connected to an antenna.

5. The ultra-wideband radar antenna switch array system according to claim 1, characterized in that: The plurality of antennas include at least one transmitting antenna for transmitting signals and a plurality of receiving antennas for receiving signals; The plurality of receiving antennas are arranged in a straight line; When the number of the transmitting antennas is at least two, the plurality of transmitting antennas are arranged in a straight line.

6. The ultra-wideband radar antenna switch array system according to claim 5, characterized in that: The distance between two adjacent receiving antennas arranged on the first straight line is half the wavelength of the ultra-wideband signal.

7. The ultra-wideband radar antenna switch array system according to claim 6, characterized in that: When the number of the transmitting antennas is at least two, the distance between two adjacent transmitting antennas arranged on the second straight line is the product of half the wavelength of the ultra-wideband signal and the number of the receiving antennas arranged on the third straight line; the third straight line is parallel to the second straight line.

8. The ultra-wideband radar antenna switch array system according to any one of claims 1 to 7, characterized in that: The single-pole multi-throw switch is a high-speed single-pole double-throw switch.

9. The ultra-wideband radar antenna switch array system according to any one of claims 1 to 7, characterized in that: The ultra-wideband chip is a 1T3R ultra-wideband chip.

10. A cabin occupancy detection device, characterized in that: The cockpit occupancy detection device is arranged in the cockpit of the vehicle; the cockpit occupancy detection device comprises: a detection module and an ultra-wideband radar antenna switch array system according to any one of claims 1 to 9; The detection module is used to detect whether there is a living body in the vehicle based on the ultra-wideband signal received and transmitted by the ultra-wideband radar antenna switch array system.

11. A vehicle, characterized in that: The cabin occupancy detection device according to claim 10 is provided in the cabin of the vehicle.

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