Radar sensing device, method and equipment

Abstract

The invention provides a radar sensing device, method and equipment, relates to the technical field of electronics, and is used for solving the blocking problem caused by crosstalk signals in the radar sensing device so as to improve the performance of the device. The apparatus comprises: a first transmission link for transmitting a transmission signal; the loopback link is used for receiving an input signal and outputting a first crosstalk cancellation signal, and the input signal is the transmitting signal or a baseband signal corresponding to the transmitting signal; the first receiving link is used for receiving the first crosstalk counteracting signal and a receiving signal, the receiving signal comprises a crosstalk signal corresponding to the transmitting signal and an echo signal after the transmitting signal is reflected by an obstacle, and the phase of the first crosstalk counteracting signal is opposite to the phase of the crosstalk signal; the absolute value of the difference between the amplitude of the first crosstalk cancellation signal and the amplitude of the crosstalk signal is smaller than a preset value.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronics, and in particular to a radar sensing device, method and equipment. BACKGROUND

[0002] Sensing integration refers to the fusion of communication and sensing functions, so that the communication system has both communication and sensing functions. The wireless channel transmits information while actively recognizing and analyzing the characteristics of the channel to perceive the physical characteristics of the surrounding environment, thereby enhancing the communication and sensing functions. Wireless fidelity (WiFi) radar sensing integration, as an important branch of sensing integration, is gaining more and more attention. Currently, the performance bottleneck of WiFi radar sensing integration is mainly the self-blocking between the transmitter-receiver (Tx-Rx) paths.

[0003] In related technologies, in order to avoid self-blocking between the transmitter-receiver paths, a dual-chip WiFi radar system is usually used, that is, the transmitter-receiver paths are arranged separately in two chips, and each chip is coupled with an antenna. In this way, the WiFi radar system can send a transmission signal through the transmitter-receiver path and its coupled antenna, receive a corresponding echo signal through the receiver-receiver path and its coupled antenna, and calculate target information according to the transmission signal and the echo signal.

[0004] However, the above WiFi radar system has the problems of large size, low integration and high cost. SUMMARY

[0005] The present application provides a radar sensing device, method and equipment for solving the blocking problem caused by crosstalk signals in the radar sensing device, thereby improving the performance of the device, and at the same time improving the integration, reducing the size and cost of the device.

[0006] To achieve the above purpose, the embodiments of the present application adopt the following technical solutions:

[0007] In a first aspect, a radar sensing device is provided, which can have a radar mode and a communication mode. The device comprises: a first transmitting link configured to transmit a transmitting signal, which can be a transmitting wave in the radar mode; a loopback link configured to receive an input signal, which is the transmitting signal or a baseband signal corresponding to the transmitting signal, and output a first crosstalk cancellation signal; and a first receiving link configured to receive the first crosstalk cancellation signal and a receiving signal, which includes a crosstalk signal corresponding to the transmitting signal and a reflected wave signal of the transmitting signal reflected by an obstacle. The first crosstalk cancellation signal has an opposite phase to that of the crosstalk signal and an absolute value of a difference between amplitudes of the first crosstalk cancellation signal and the crosstalk signal is less than a preset value, such as 0 or close to 0.

[0008] In the above technical solution, the first transmitting link is configured to transmit a transmitting signal, the loopback link is configured to receive an input signal and output a first crosstalk cancellation signal for the first receiving link, and the first receiving link is configured to receive the first crosstalk cancellation signal and a receiving signal. The first crosstalk cancellation signal has an opposite phase to that of a crosstalk signal in the receiving signal and an absolute value of a difference between amplitudes of the first crosstalk cancellation signal and the crosstalk signal is less than a preset value. Thus, the first crosstalk cancellation signal can be used to reduce or cancel the crosstalk signal in the receiving signal, thereby solving the blocking problem caused by the crosstalk signal and improving the performance of the device. Meanwhile, the device can be a single-chip structure, thereby improving the integration, reducing the volume and cost of the device compared with the prior art.

[0009] In a possible implementation of the first aspect, the loopback link comprises a first coupler, a second coupler, a gain and phase adjustment circuit, a first matching resistor and a second matching resistor. One end of the gain and phase adjustment circuit is coupled to an output end of the first transmitting link and one end of the first matching resistor through the first coupler, and the other end of the gain and phase adjustment circuit is coupled to an input end of the first receiving link and one end of the second matching resistor through the second coupler. The other end of the first matching resistor and the other end of the second matching resistor are coupled to a ground end. The gain and phase adjustment circuit is configured to adjust the phase and / or amplitude of the input signal. In the above possible implementation, the gain and phase adjustment circuit is used to adjust the phase and / or amplitude of the input signal, so that the first crosstalk cancellation signal has an opposite phase to that of a crosstalk signal in the receiving signal and an absolute value of a difference between amplitudes of the first crosstalk cancellation signal and the crosstalk signal is less than a preset value. Thus, the first crosstalk cancellation signal can be used to reduce or cancel the crosstalk signal, thereby solving the blocking problem caused by the crosstalk signal.

[0010] In a possible implementation manner of the first aspect, the gain-phase adjustment circuit comprises a gain controller and a phase shifter, for example, the gain controller can comprise an attenuator and / or an adjustable amplifier. In the possible implementation manner, the amplitude of the input signal is adjusted by the gain controller, and the phase of the input signal is adjusted by the phase shifter, so that flexibility of adjusting the amplitude and the phase of the input signal can be achieved.

[0011] In a possible implementation manner of the first aspect, the gain-phase adjustment circuit comprises a gain controllable phase shifter. In the possible implementation manner, the phase and the amplitude of the input signal are adjusted by the gain controllable phase shifter, so that the complexity of the gain-phase adjustment circuit can be reduced while the phase and the amplitude of the input signal are adjusted.

[0012] In a possible implementation manner of the first aspect, the apparatus further comprises a control circuit configured to control the gain-phase adjustment circuit to adjust the phase and / or the amplitude of the input signal. In the possible implementation manner, the adjustment of the gain-phase adjustment circuit is controlled by the control circuit, so that the accuracy of the adjustment can be improved.

[0013] In a possible implementation manner of the first aspect, the apparatus is configured to transmit and receive radar signals; the first transmitting chain and the first receiving chain are further configured to respectively transmit the transmitting signal and receive the receiving signal; and the loopback chain is further configured to output a plurality of crosstalk cancellation signals, the plurality of crosstalk cancellation signals having different phases and / or amplitudes. The control circuit is further configured to determine a plurality of direct path powers of a plurality of received cancellation signals, the plurality of received cancellation signals being obtained by superimposing the receiving signal and the plurality of crosstalk cancellation signals respectively; and the control circuit is further configured to determine a crosstalk cancellation signal corresponding to a minimum direct path power in the plurality of direct path powers as a first crosstalk cancellation signal. In the possible implementation manner, the direct path powers of the plurality of received cancellation signals are determined, so that the phase and the amplitude of a more appropriate crosstalk cancellation signal, that is, the first crosstalk cancellation signal, can be determined, so that the cancellation effect can be improved when the crosstalk signal in the receiving signal is reduced or cancelled according to the first crosstalk cancellation signal.

[0014] In a possible implementation manner of the first aspect, the apparatus further comprises at least two transceiving channels, and the first transmitting chain and the first receiving chain are located in different transceiving channels of the at least two transceiving channels. In the possible implementation manner, the apparatus can comprise at least two transceiving channels, that is, the apparatus can be a multiple-input multiple-output (MIMO) structure, so that the diversity of the structure of the apparatus is improved, and the use range of the apparatus is also improved.

[0015] In a possible implementation manner of the first aspect, the loopback link comprises a second transmitting chain and a third coupler, the second transmitting chain is coupled to the first receiving chain through the third coupler, and the second transmitting chain can multiplex other transmitting chains in the device except the first transmitting chain; the second transmitting chain is configured to receive a baseband signal corresponding to the transmitting signal and output a coupling signal; and the third coupler is configured to receive the coupling signal and output the first crosstalk cancellation signal. In the possible implementation manner, by multiplexing other transmitting chains in the device except the first transmitting chain as the second transmitting chain and outputting the first crosstalk cancellation signal through the second transmitting chain and the third coupler, the integration of the device can be further improved, and the volume and cost can be reduced.

[0016] In a possible implementation manner of the first aspect, the device further comprises a baseband circuit; the loopback link, the first transmitting chain, the first receiving chain and the baseband circuit are integrated in one chip; or the loopback link, a part of the first transmitting chain except a front-end module, a part of the first receiving chain except a front-end module and the baseband circuit are integrated in one chip; or a front-end module corresponding to the first transmitting chain and a front-end module corresponding to the first receiving chain are located outside a chip where the baseband circuit is located. In the possible implementation manner, the flexibility and diversity of the device in design and integration can be improved.

[0017] In a possible implementation manner of the second aspect, the device comprises a first transmitting chain, a loopback link and a first receiving chain, and the method further comprises: the first transmitting chain transmits the transmitting signal; the loopback link receives an input signal and outputs a first crosstalk cancellation signal, the input signal being the transmitting signal or a baseband signal corresponding to the transmitting signal; and the first receiving chain respectively receives the first crosstalk cancellation signal and the receiving signal, the receiving signal comprising a crosstalk signal corresponding to the transmitting signal and a return signal of the transmitting signal reflected by an obstacle, a phase of the first crosstalk cancellation signal being opposite to a phase of the crosstalk signal, and an absolute value of a difference between an amplitude of the first crosstalk cancellation signal and an amplitude of the crosstalk signal being less than a preset value.

[0018] In a possible implementation manner of the second aspect, the device comprises a first transmitting chain, a loopback link and a first receiving chain, and the method further comprises: the first transmitting chain transmits the transmitting signal; the loopback link receives an input signal and outputs a first crosstalk cancellation signal, the input signal being the transmitting signal or a baseband signal corresponding to the transmitting signal; and the first receiving chain respectively receives the first crosstalk cancellation signal and the receiving signal, the receiving signal comprising a crosstalk signal corresponding to the transmitting signal and a return signal of the transmitting signal reflected by an obstacle, a phase of the first crosstalk cancellation signal being opposite to a phase of the crosstalk signal, and an absolute value of a difference between an amplitude of the first crosstalk cancellation signal and an amplitude of the crosstalk signal being less than a preset value.

[0019] In a possible implementation manner of the second aspect, the loopback link comprises: a first coupler, a second coupler, a gain-phase adjustment circuit, a first matching resistor and a second matching resistor; one end of the gain-phase adjustment circuit is coupled with an output end of the first transmit chain and one end of the first matching resistor through the first coupler, the other end of the gain-phase adjustment circuit is coupled with an input end of the first receive chain and one end of the second matching resistor through the second coupler, the other end of the first matching resistor and the other end of the second matching resistor are coupled with a ground end; and the loopback link receiving the input signal and outputting the first crosstalk cancellation signal comprises: the gain-phase adjustment circuit adjusting the phase and / or amplitude of the input signal to obtain the first crosstalk cancellation signal.

[0020] In a possible implementation manner of the second aspect, the gain-phase adjustment circuit comprises a gain controller and a phase shifter; and the gain-phase adjustment circuit adjusting the phase and / or amplitude of the input signal comprises: the gain controller adjusting the amplitude of the input signal and the phase shifter adjusting the phase of the input signal.

[0021] In a possible implementation manner of the second aspect, the gain-phase adjustment circuit comprises a gain-controllable phase shifter; and the gain-phase adjustment circuit adjusting the phase and / or amplitude of the input signal comprises: the gain-controllable phase shifter adjusting the phase and / or amplitude of the input signal.

[0022] In a possible implementation manner of the second aspect, the apparatus further comprises a control circuit, and the method further comprises: the control circuit controlling the gain-phase adjustment circuit to adjust the phase and / or amplitude of the input signal.

[0023] In a possible implementation manner of the second aspect, the loopback link comprises a second transmit chain and a third coupler, the second transmit chain being coupled with the first receive chain through the third coupler; and the loopback link outputting the crosstalk cancellation signal according to the input signal comprises: the second transmit chain receiving a baseband signal corresponding to the transmit signal and outputting a coupling signal; and the third coupler receiving the coupling signal and outputting the first crosstalk cancellation signal.

[0024] In a third aspect, a chip is provided, which comprises a circuit board and a radar sensing device as provided in the first aspect or any possible implementation manner of the first aspect, and the radar sensing device is arranged on the circuit board.

[0025] In a fourth aspect, an electronic device is provided, which comprises a first antenna, a second antenna and a radar sensing device as provided in the first aspect or any possible implementation manner of the first aspect, the first antenna being coupled with the first transmit chain in the device, and the second antenna being coupled with the first receive chain in the device.

[0026] In a fifth aspect, a computer-readable storage medium is provided, which stores computer instructions, when the computer instructions are executed on a device, cause the device to perform the method provided in the second aspect or any possible implementation manner of the second aspect.

[0027] In a sixth aspect, a computer program product is provided, which comprises a computer program, when the computer program is executed by a device, cause the device to perform the method provided in the second aspect or any possible implementation manner of the second aspect.

[0028] It can be understood that the beneficial effects achieved by the second aspect to the sixth aspect can correspond to the beneficial effects provided in the first aspect or any possible implementation manner of the first aspect, which will not be described here. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 A structural schematic diagram of a dual-chip WiFi radar system provided by an embodiment of the present application;

[0030] Figure 2 A structural schematic diagram of a single-chip WiFi radar system provided by an embodiment of the present application;

[0031] Figure 3 A structural schematic diagram of an electronic device provided by an embodiment of the present application;

[0032] Figure 4 A structural schematic diagram of a radar sensing device provided by an embodiment of the present application;

[0033] Figure 5 A working mode schematic diagram of a radar sensing device provided by an embodiment of the present application;

[0034] Figure 6 A structural schematic diagram of another radar sensing device provided by an embodiment of the present application;

[0035] Figure 7 A structural schematic diagram of another radar sensing device provided by an embodiment of the present application;

[0036] Figure 8 A structural schematic diagram of another radar sensing device provided by an embodiment of the present application;

[0037] Figure 9 A structural schematic diagram of another radar sensing device provided by an embodiment of the present application;

[0038] Figure 10 A structural schematic diagram of another radar sensing device provided by an embodiment of the present application;

[0039] Figure 11 A schematic diagram of a calibration procedure of a loopback link is provided for an embodiment of the present application.

[0040] Figure 12 A waveform diagram of a signal in a radar sensing device is provided for an embodiment of the present application.

[0041] Figure 13 A structural schematic diagram of another electronic device is provided for an embodiment of the present application. DETAILED DESCRIPTION

[0042] The making and using of various embodiments will now be described in detail. It should be appreciated that numerous specific implementation details, relationships, and methods are set forth to provide a full understanding of embodiments of the application. One having ordinary skill in the art will recognize that the application can be practiced without one or more of the specific details or with other methods. In other instances, well-known structures and functions have not been described in detail in order to avoid obscuring the application.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0044] Circuits or other components can be described as or said to be "configured to" perform a task or tasks, in instances of this specific terminology, "configured to" is used to convey structural representations of example circuits / components that perform one or more tasks during operation. Accordingly, a circuit / component can be said to be configured to perform a task even when the task is not being performed by the circuit / component at a given moment. Circuits / components that are "configured to" perform a task include hardware such as, for example, circuitry that performs the task during operation.

[0045] The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. In the present application, "at least one" means one or more, and "multiple" means two or more. The association relationship between the associated objects is described using "and / or", which means that there can be three relationships, for example, A and / or B, which means that A exists alone, A and B exist together, and B exists alone, where A and B can be singular or plural. The character " / " generally represents an "or" relationship between the associated objects. "At least one of the following" or similar expressions means any combination of these items, including any combination of single or multiple items. For example, at least one of a, b or c can mean a, b, c, a and b, a and c, b and c, a, b and c; where a, b and c can be single or multiple.

[0046] Embodiments of the present application use the terms "first" and "second" and the like to distinguish between similar objects or functions or actions that are performed by different objects or actors. It is understood that the terms "first" and "second" and the like are not intended to limit the number or the order of the objects or actions. The term "coupled" is used to express an electrical connection, including direct connection or indirect connection through wires or connectors, or indirect connection through other devices. Therefore, "coupled" should be regarded as a broad electrical connection.

[0047] It should be noted that the terms "exemplary" and "for example" are used herein to mean "an example of." Any embodiment or design described herein as "exemplary" or "for example" should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the exemplary or for example embodiments are presented so as to enable a clear and concise disclosure of the disclosure. The terms "exemplary" and "for example" are used herein to mean "an example of."

[0048] Before introducing the embodiments of the present application, the application scenarios involved in the present application are first introduced and explained.

[0049] Sensing integration refers to the fusion of communication and sensing functions, so that the communication system has both communication and sensing functions. In the wireless channel, information is transmitted while the characteristics of the channel are actively perceived and analyzed, so as to perceive the physical characteristics of the surrounding environment, thereby enhancing the functions of communication and sensing. Wireless fidelity (WiFi) radar sensing integration, as an important branch of sensing integration, is gaining more and more attention. The performance bottleneck of the above WiFi radar sensing integration mainly lies in the self-blocking between the transmit path and the receive path (Tx-Rx).

[0050] In order to avoid self-blocking between the transmit path and the receive path, a WiFi radar system with double chips (or double antennas-double chips) is usually used. That is, the transmit path and the receive path are arranged in two chips, and each chip is coupled with an antenna. For example, as shown in Figure 1 The WiFi radar system with double chips includes a WiFi chip 1 provided with a transmit path and a WiFi chip 2 provided with a receive path. The WiFi chip 1 is coupled with a Tx antenna, and the WiFi chip 2 is coupled with an Rx antenna. In this way, the WiFi radar system can send a transmit signal (or a transmit wave) through the transmit path in the WiFi chip 1 and the coupled Tx antenna, receive a backwave signal of the transmit signal reflected by an obstacle (such as a person) through the receive path in the WiFi chip 2 and the coupled Rx antenna, and calculate target information according to the transmit signal and the backwave signal, such as comparing the backwave signal with the waveform of the transmit signal stored and known by itself. However, the above WiFi radar system has the problems of large size, low integration level and high cost.

[0051] Compared with the above-mentioned dual-chip WiFi radar system, the single-chip WiFi radar system has significant advantages in cost and performance. An exemplary, Figure 2 Fig. 1 is a structural schematic diagram of a single-chip WiFi radar system, which comprises a WiFi chip provided with a transmitting path and a receiving path, and a Tx antenna and an Rx antenna coupled with the WiFi chip. The working principle of the single-chip WiFi radar system is similar to that of the above-mentioned dual-chip WiFi radar system, which will not be described herein.

[0052] In the single-chip WiFi radar system, the transmitting path and the receiving path share one chip package, and the positions and pitches of the package pins corresponding to the two paths are affected by factors such as floor plan and package size, resulting in limited isolation of the two paths. Therefore, the self-blocking situation under the single-chip architecture is more severe than that under the dual-chip architecture, and the main blocking includes: 1st, direct-path crosstalk signals directly received by the Rx antenna from the Tx antenna; 2nd, coupling crosstalk signals between the feed lines of the Tx antenna and the Rx antenna in the board-level scheme; 3rd, coupling crosstalk signals in the radio frequency and intermediate frequency parts inside the WiFi chip; and 4th, coupling crosstalk signals between the package pins of the WiFi chip.

[0053] The strength of the above-mentioned crosstalk signals is often much greater than that of the echo signal, and similar to the form and nature of the echo signal, so that it is difficult to separate the signals in the back-end processing, and it seriously interferes with the detection of more distant and more fine targets. A typical example is: in the 2.4 GHz band, under the condition that the gain of the Tx antenna and the Rx antenna is 2dBi, for a 0.5m 2 The strength of the above-mentioned crosstalk signals is often much greater than that of the echo signal, and similar to the form and nature of the echo signal, so that it is difficult to separate the signals in the back-end processing, and it seriously interferes with the detection of more distant and more fine targets. A typical example is: in the 2.4 GHz band, under the condition that the gain of the Tx antenna and the Rx antenna is 2dBi, for a 0.5m

[0054] Based on this, the embodiment of the present application provides a radar sensing device (such as a WiFi radar sensing device), a loopback link in the radar sensing device can be used to output a first crosstalk cancellation signal for a receiving link, and the first crosstalk cancellation signal is opposite in phase to a crosstalk signal in a receiving signal of the receiving link, and the absolute value of the difference between the amplitudes is less than a preset value, so that the first crosstalk cancellation signal can be used to reduce or cancel the crosstalk signal of the receiving signal, thereby solving the blocking problem caused by the crosstalk signal, and further improving the performance of the device.

[0055] The technical solution of the present application can be applied to an electronic device with the radar sensing device. The electronic device includes but is not limited to a mobile phone, a tablet computer, a notebook computer, a desktop computer, a palm computer, an ultra-mobile personal computer (umPC), a mobile internet device (MID), a netbook, a video camera, a camera, a wearable device (such as a smart watch and a smart bracelet), a vehicle-mounted device (such as a car, a bicycle, an electric vehicle, an airplane, a ship, a train, a high-speed rail, etc.), a virtual reality (VR) device, an augmented reality (AR) device, a wireless terminal in industrial control, a smart home device (such as a refrigerator, a television, an air conditioner, an electricity meter, etc.), a smart robot, a workshop device, a wireless terminal in self-driving, a wireless terminal in remote medical surgery, a wireless terminal in a smart grid, a wireless terminal in transportation safety, a wireless terminal in a smart city, or a wireless terminal in a smart home, a flight device (such as a smart robot, a hot air balloon, a drone, an airplane), etc.

[0056] Figure 3 A structural schematic diagram of an electronic device provided by the embodiment of the present application is provided, and the electronic device is taken as an example for illustration. The electronic device can include a processor 110, an external memory interface 120, an internal memory 121, a universal serial bus (USB) interface 130, a wireless communication module 160, an audio module 170, a sensor module 180, a key 190, a motor 191, an indicator 192, a camera 193, and a vehicle-mounted display device 194, etc.

[0057] The processor 110 can include one or more processing units, for example: the processor 110 can include an application processor (AP), a modem processor, a graphics processing unit (GPU), an image signal processor (ISP), a controller, a video codec, a digital signal processor (DSP), a baseband processor, and / or a neural-network processing unit (NPU), etc. Different processing units can be independent devices or integrated in one or more processors.

[0058] The controller described above can generate operation control signals according to instruction operation codes and timing signals to complete the control of fetching and executing instructions. Optionally, the controller is a vehicle-mounted controller. In a possible example, the controller is a cockpit domain controller (CDC).

[0059] The processor 110 can also be provided with a memory for storing instructions and data. In some embodiments, the memory in the processor 110 is a cache memory. The memory can save instructions or data that have just been used or are used repeatedly by the processor 110. If the processor 110 needs to use the instructions or data again, it can directly call from the memory. This avoids repeated access and reduces the waiting time of the processor 110, thereby improving the efficiency of the system.

[0060] In some embodiments, the processor 110 can include one or more interfaces. The interfaces can include an inter-integrated circuit (I2C) interface, an inter-integrated circuit sound (I2S) interface, a pulse code modulation (PCM) interface, a universal asynchronous receiver / transmitter (UART) interface, a mobile industry processor interface (MIPI), a general-purpose input / output (GPIO) interface, a subscriber identity module (SIM) interface, and / or a universal serial bus (USB) interface, etc.

[0061] The MIPI interface can be used to connect the processor 110 and peripheral devices such as the vehicle display device 194, the camera 193, etc. The MIPI interface includes a camera serial interface (CSI), a display screen serial interface (DSI), etc. In some embodiments, the processor 110 and the camera 193 communicate through the CSI interface to implement the photographing function of the electronic device. The processor 110 and the vehicle display device 194 communicate through the DSI interface to implement the display function of the electronic device.

[0062] The USB interface 130 is an interface conforming to the USB standard specification, and can be a Mini USB interface, a Micro USB interface, a USB Type C interface, etc. The USB interface 130 can be used to connect a charger to charge the electronic device, and can also be used to transmit data between the electronic device and a peripheral device. It can also be used to connect earphones to play audio through the earphones. The interface can also be used to connect other electronic devices, such as augmented reality (AR) devices, etc.

[0063] It can be understood that the interface connection relationship between the modules shown in the embodiments of the present application is only illustrative and does not constitute a structural limitation on the electronic device. In some other embodiments of the present application, the electronic device can also use different interface connection methods or combinations of multiple interface connection methods in the above embodiments.

[0064] The wireless communication function of the electronic device can be implemented through an antenna, a wireless communication module 160, a modem processor, and a baseband processor, etc.

[0065] An antenna is used to transmit and receive electromagnetic wave signals. Each antenna in the electronic device can be used to cover a single or multiple communication frequency bands. Different antennas can also be multiplexed to improve the utilization of the antennas. For example, the antennas can be multiplexed as diversity antennas for wireless local area networks. In some other embodiments, the antennas can be used in combination with a tuning switch.

[0066] The wireless communication module 160 can provide solutions for wireless communication applied on the electronic device, including wireless local area networks (WLAN) (such as wireless fidelity (WiFi) networks), Bluetooth (BT), global navigation satellite system (GNSS), frequency modulation (FM), near field communication (NFC), infrared technology (IR), etc. The wireless communication module 160 can be one or more devices integrating at least one communication processing module. The wireless communication module 160 receives electromagnetic waves via an antenna, performs frequency modulation and filtering processing on the electromagnetic wave signals, and sends the processed signals to the processor 110. The wireless communication module 160 can also receive signals to be sent from the processor 110, perform frequency modulation, amplification, and convert the signals to electromagnetic wave radiation via the antenna.

[0067] In some embodiments, the electronic device can communicate with a network and other devices through wireless communication technology. The wireless communication technology can include global system for mobile communications (GSM), general packet radio service (GPRS), code division multiple access (CDMA), wideband code division multiple access (WCDMA), time-division code division multiple access (TD-SCDMA), long term evolution (LTE), BT, GNSS, WLAN, NFC, FM, and / or IR technology, etc. The GNSS can include a global positioning system (GPS), a global navigation satellite system (GLONASS), a beidu navigation satellite system (BDS), a quasi-zenith satellite system (QZSS), and / or a satellite based augmentation systems (SBAS).

[0068] The electronic device implements a display function through a GPU, a vehicle display device 194, and an application processor, etc. The GPU is a microprocessor for image processing, which is connected to the vehicle display device 194 and the application processor. The GPU is used to perform mathematical and geometric calculations for graphics rendering. The processor 110 can include one or more GPUs that execute program instructions to generate or change display information.

[0069] The in-vehicle display device 194 is configured to display images, videos, and the like. The in-vehicle display device 194 can include a display panel. The display panel can be manufactured by using a liquid crystal display (LCD), for example, an organic light-emitting diode (OLED), an active-matrix organic light-emitting diode (AMOLED), a flex light-emitting diode (FLED), a mini light emitting diode (Mini-LED), a micro-LED, a micro-OLED, a quantum dot light emitting diode (QLED), or the like. Optionally, the electronic device can include one or more in-vehicle display devices 194.

[0070] The camera 193 is configured to capture still images or videos. An object generates an optical image through a lens and projects the optical image to a photosensitive element. The photosensitive element can be a charge coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS) phototransistor. The photosensitive element converts the optical signal into an electrical signal, and then transmits the electrical signal to an ISP to convert the electrical signal into a digital image signal. The ISP outputs the digital image signal to a DSP for processing. The DSP converts the digital image signal into an image signal in a standard red green blue (RGB), luminance chrominance (YUV), or the like. Optionally, the electronic device can include one or more cameras 193.

[0071] The external memory interface 120 can be configured to connect an external memory card, such as a Micro SD card, to expand the storage capacity of the electronic device. The external memory card communicates with the processor 110 through the external memory interface 120 to implement a data storage function. For example, music, video, and the like are saved in the external memory card.

[0072] The internal memory 121 can be used to store computer executable program codes including instructions. The internal memory 121 can include a program storage area and a data storage area. The program storage area can store an operating system, at least one application program required by a function (such as a sound playing function and an image playing function), and the like. The data storage area can store data created during the use of the electronic device (such as audio data and a phonebook), and the like. In addition, the internal memory 121 can include a high-speed random access memory, and can further include a non-volatile memory such as at least one of a magnetic disk storage device, a flash memory device, a universal flash storage (UFS), and the like. The processor 110 executes various function applications and data processing of the electronic device by running the instructions stored in the internal memory 121 and / or the instructions stored in the memory disposed in the processor 110.

[0073] The audio module 170 is configured to convert digital audio information into an analog audio signal output, and to convert an analog audio input into a digital audio signal. The audio module 170 can also be configured to encode and decode audio signals. In some embodiments, the audio module 170 can be disposed in the processor 110, or some function modules of the audio module 170 can be disposed in the processor 110. The electronic device can play music, record sound, and the like through the audio module 170. The audio module 170 can include a speaker, a receiver, a microphone, a headphone interface, and an application processor, and the like to implement audio functions.

[0074] The sensor module 180 can include a pressure sensor, a gyro sensor, a barometric pressure sensor, a magnetic sensor, an acceleration sensor, a distance sensor, a proximity light sensor, a fingerprint sensor, a temperature sensor, a touch sensor, an ambient light sensor, and a bone conduction sensor, and the like.

[0075] The touch sensor, also referred to as a “touch device”. The touch sensor can be disposed in a display screen in the vehicle-mounted display device 194, and a touch screen, also referred to as a “touch panel”, is formed by the touch sensor and the display screen. The touch sensor is configured to detect a touch operation acting on or near the touch sensor. The touch sensor can transmit the detected touch operation to the application processor to determine a touch event type. A visual output related to the touch operation can be provided through the display screen. In other embodiments, the touch sensor can also be disposed on the surface of the electronic device, which is different from the position where the display screen is located.

[0076] The keys 190 include a home key, a power key, a volume key, and the like. The keys 190 can be mechanical keys. Alternatively, the keys 190 can be touch keys. The electronic device can receive a key input, and generate a key signal input related to the user settings and function control of the electronic device.

[0077] The motor 191 can be used for touch vibration feedback. For example, different vibration feedback effects can be used for touch operations of different applications. Different vibration feedback effects can also be used for touch operations on different areas of the display screen of the vehicle-mounted display device 194. The touch vibration feedback effects can also be customized.

[0078] The indicator 192 can be an indicator light, which can be used to indicate changes in power, messages, turn signals, seat belt reminder lights, and the like.

[0079] It can be understood that the structure of the embodiments of the present application does not constitute a specific limitation on the electronic device. In other embodiments of the present application, the electronic device can include more or fewer components than the diagram, or combine certain components, or split certain components, or different component arrangements. The components shown can be implemented in hardware, software, or a combination of software and hardware.

[0080] Figure 4 A structure diagram of a radar sensing device provided by an embodiment of the present application is shown. The device includes a first transmission link 21, a loopback link 22, and a first reception link 23. The first transmission link 21 is used to transmit a transmission signal, such as a radar transmission wave. The loopback link 22 is used to receive an input signal, output a first crosstalk cancellation signal, and the input signal is the transmission signal or a baseband signal corresponding to the transmission signal. The first reception link 23 is used to receive the first crosstalk cancellation signal and a reception signal, and the reception signal includes a crosstalk signal corresponding to the transmission signal and a return wave signal after the transmission signal is reflected by an obstacle. The phase of the first crosstalk cancellation signal is opposite to the phase of the crosstalk signal, and the absolute value of the difference between the amplitude of the first crosstalk cancellation signal and the amplitude of the crosstalk signal is less than a preset value.

[0081] In this document, the link can also be referred to as a path, that is, the transmission link can also be referred to as a transmission path, the loopback link can also be referred to as a loopback path, and the reception link can also be referred to as a reception path. In addition, the absolute value of the difference between the amplitude of the first crosstalk cancellation signal and the amplitude of the crosstalk signal being less than a preset value can mean that the difference between the amplitude of the first crosstalk cancellation signal and the amplitude of the crosstalk signal is equal to 0, or close to 0. The preset value can be set according to actual conditions, and the embodiments of the present application do not make specific limitations.

[0082] The first transmission chain 21 may be coupled to a transmission antenna (which may be represented as a Tx antenna). Specifically, the first transmission chain 21 may transmit the transmission signal via the Tx antenna. Optionally, the first transmission chain 21 may include at least one of a digital-to-analog converter (DAC), a low-pass filter (LPF), a mixer (MIX), an amplifier (AMP), a pre-power amplifier (PPA), a power amplifier (PA), or a transmission filter.

[0083] The first receiving chain 23 can be coupled to a receiving antenna (which can be represented as an Rx antenna). Specifically, the first receiving chain 23 can receive, through the Rx antenna, an echo signal after the transmitted signal is reflected by an obstacle. Optionally, the first receiving chain 23 can include at least one of an analog-to-digital converter (ADC), a variable gain amplifier (VGA), a mixer MIX, a low-pass filter LPF, an amplifier AMP, a low noise amplify (LNA), or a receive filter.

[0084] Optionally, the radar communication device can have two working modes, namely radar mode and communication mode, and the radar mode can also be called radar transceiver mode. Figure 5 As shown, the radar telepathy device can be a WiFi radar telepathy device, which can have a WiFi radar mode and a WiFi communication mode. The WiFi radar mode can also be referred to as a WiFi radar transceiver mode. The device can operate in the WiFi radar mode and the WiFi communication mode using the same frequency or different frequencies, and can be used to transmit radar frames or radar signals in the WiFi radar mode, and can be used to transmit communication frames or communication signals in the WiFi communication mode. In one possible example, the device can be used to continuously transmit communication frames, or continuously transmit radar frames, or to transmit communication frames and radar frames at intervals. The communication frames and radar frames can be transmitted using different powers or the same power, and this embodiment of the application does not impose any specific limitations on this.

[0085] The radar mode is used for transmitting and receiving radar signals, which can be used to realize detection of the surrounding environment, such as detecting the distance, moving speed, etc. of a target object. The communication mode is used for transmitting and receiving communication signals, which can be used to realize communication between the device and other devices, such as transmitting data to other devices, or receiving data from other devices, etc.

[0086] Further, the loopback link 22 can have various structures, and the input signal corresponding to the loopback link 22 will be different when the structure of the loopback link 22 is different. The structure of the loopback link 22 and the corresponding input signal will be introduced and described below.

[0087] In a first possible embodiment, as shown in Figure 6 and Figure 7 , the loopback link 22 includes a first coupler 221, a second coupler 222, a gain and phase adjustment circuit 223, a first matching resistor R1 and a second matching resistor R2. One end of the gain and phase adjustment circuit 223 is coupled to the output end of the first transmit link 21 and one end of the first matching resistor R1 through the first coupler 221, the other end of the gain and phase adjustment circuit 223 is coupled to the input end of the first receive link 23 and one end of the second matching resistor R2 through the second coupler 222, and the other end of the first matching resistor R1 and the other end of the second matching resistor R2 are coupled to the ground. In an example, the first matching resistor R1 is 50 ohms (Ω), and the second matching resistor R2 is 50Ω. The first matching resistor R1 and the second matching resistor R2 can improve the directivity of the first coupler 221 and the second coupler 222.

[0088] Specifically, the first coupler 221 can be used to receive the transmit signal transmitted by the first transmit link 21, and output the input signal of the loopback link 22; the gain and phase adjustment circuit 223 can be used to adjust the phase and / or amplitude of the input signal, and output the adjusted signal to the second coupler 222; the second coupler 222 can be used to receive the adjusted signal and output the first crosstalk cancellation signal, i.e. couple the adjusted signal to the first receive link 23 to output the first crosstalk cancellation signal to the first receive link 23.

[0089] In a possible example, as shown in Figure 6 (a) and (b), the gain and phase adjustment circuit 223 includes a gain controller 2231 and a phase shifter 2232. The gain controller 2231 can be used to adjust the amplitude of the input signal, and the phase shifter 2232 can be used to adjust the phase of the input signal. For example, the gain controller 2231 can include an adjustable attenuator and / or an adjustable amplifier. Figure 6For example, the first transmit chain 21 includes a power amplifier PA, or a power amplifier PA and an amplifier AMP, and the first receive chain 23 includes a low noise amplifier LNA, or an amplifier AMP and a low noise amplifier LNA.

[0090] Optionally, the number of gain controllers 2231 and the number of phase shifters 2232 included in the gain and phase adjustment circuit 223 can be one or more, which can be coupled in series, in parallel, or in a combination of series and parallel, and the present application does not make a specific limitation on the embodiments.

[0091] The gain controller 2231 and the phase shifter 2232 can also be integrated or combined together, for example, the gain controller 2231 and the phase shifter 2232 can be combined together to be implemented by one device, such as a gain-controllable phase shifter.

[0092] In another possible example, as shown in Figure 7 The gain and phase adjustment circuit 223 includes a gain-controllable phase shifter 2233. The gain-controllable phase shifter 2233 can be used to adjust the phase and amplitude of the input signal. Figure 7 For example, the first transmit chain 21 includes a power amplifier PA and an amplifier AMP, and the first receive chain 23 includes a low noise amplifier LNA and an amplifier AMP. In an example, the gain-controllable phase shifter 2233 includes an I-path amplifier, a Q-path amplifier, and an adder, and the I-path amplifier and the Q-path amplifier can be VGAs. The input end of the I-path amplifier and the input end of the Q-path amplifier are coupled to serve as the input end Vin of the gain-controllable phase shifter 2233; the output end of the I-path amplifier and the output end of the Q-path amplifier are coupled to two input ends of the adder, and the output end of the adder serves as the output end Vout of the adder.

[0093] Optionally, the apparatus can be a multiple-input multiple-output (MIMO) structure. For example, the apparatus further includes at least two transceiver channels (CHs), and the first transmit chain 21 and the first receive chain 23 are located in different transceiver channels of the at least two transceiver channels. For example, Figure 8As shown, the at least two transceiver channels include a first channel CH1 and a second channel CH2. Each of the first channel CH1 and the second channel CH2 includes a transmitting link and a receiving link. The transmitting link and the receiving link in the same channel can be coupled with the antenna corresponding to the channel through a selection switch. The first transmitting link 21 can be the transmitting link in the first channel CH1, and the first receiving link 23 can be the receiving link in the second channel CH2. Figure 8 In the example, the transmission link and the receiving link of each channel both include an amplifier AMP, and the gain controller 2231 and the phase shifter 2232 are combined together in the loopback link 22 and implemented by the gain controllable phase shifter 2233.

[0094] In a second possible embodiment, Figure 9 As shown, the loopback link 22 includes a second transmitting link 24 and a third coupler 224. The second transmitting link 24 is coupled to the first receiving link 23 via the third coupler 224. The second transmitting link 24 can be used to receive the baseband signal and output a coupled signal; the third coupler 224 can be used to receive the coupled signal and output the first crosstalk cancellation signal. That is, the third coupler 224 is used to couple the coupled signal to the first receiving link 23 to output the first crosstalk cancellation signal to the first receiving link 23.

[0095] Optionally, the device may include multiple transmit chains, and the second transmit chain 24 may be a transmit chain other than the first transmit chain 21 in the device. That is, the loopback chain 22 may reuse a transmit chain other than the first transmit chain 21 in the device. In this example, the second transmit chain 24 and the first receive chain 23 may be located in the same channel (e.g., located in the first channel CH1). Furthermore, the device may also include multiple receive chains. For example, the device further includes a second receive chain 25, and the second receive chain 25 and the first transmit chain 21 may be located in the same channel (e.g., located in the second channel CH2). Optionally, the transmit chain and receive chain located in the same channel may be coupled to the antenna corresponding to the channel via a selector switch.

[0096] In one example, Figure 9 As shown, the transmitting chain in the first channel CH1 and the second channel CH2 may include a coupled digital-to-analog converter DAC, a low-pass filter LPF, a mixer MIX, a pre-stage power amplifier PPA and a power amplifier PA (the PPA and the PA are coupled to the first node), and the receiving chain may include a coupled analog-to-digital converter ADC, a variable gain amplifier VGA, a mixer MIX and a low-noise amplifier LNA (the MIX and the LNA are coupled to the second node), wherein the third coupler 224 in the loopback link 22 may be coupled between the first node and the second node.

[0097] It can be understood that the above-mentioned Figure 9 The coupling relationship between the third coupler 224 and the transmit chain of the first channel CH1 and the receive chain of the second channel CH2 shown in the figure is only in the example. In some other examples, the third coupler 224 can also be coupled with the transmit chain of the first channel CH1 and the receive chain of the second channel CH2 through other nodes, for example, the coupling points of the third coupler 224 with the transmit chain of the first channel CH1 and the receive chain of the second channel CH2 can be located before the mixer MIX, or other nodes after the mixer MIX, and the like, and the embodiments of the present application do not make specific limitations thereto.

[0098] Further, the apparatus further includes a baseband circuit, and all links, part of the links, or part of the devices in the part of the links in the apparatus can be integrated in a chip with the baseband circuit. Optionally, the loopback link 22, the first transmit chain 21, the first receive chain 23 and the baseband circuit are integrated in a chip; or the loopback link 22, part of the first transmit chain 21 except the front end module (FEM), part of the first receive chain 23 except the FEM and the baseband circuit are integrated in a chip; or the loopback link 22, the FEM corresponding to the first transmit chain 21 and the FEM corresponding to the first receive chain are located outside the chip where the baseband circuit is located. For example, the chip can be referred to as a WiFi chip. For example, the FEM can include but is not limited to one or more of a PA, an LNA or a switching switch.

[0099] In an example, as shown in Figure 6 and Figure 8 The first transmit chain 21, the loopback link 22 and the first receive chain 23 in the apparatus can all be located in the WiFi chip; or as shown in Figure 9 The first transmit chain 21, the loopback link 22, the first receive chain 23, the second transmit chain 24 and the second receive chain 25 in the apparatus can all be located in the WiFi chip.

[0100] In another example, as shown in Figure 7 Part of the devices in the first transmit chain 21 and the first receive chain 23 in the apparatus are located in the WiFi chip, for example, the devices before the power amplifier PA in the first transmit chain 21 and the devices before the low noise amplifier LNA in the first receive chain 23 can be located in the WiFi chip, and the power amplifier PA in the first transmit chain 21, the low noise amplifier LNA in the first receive chain 23 and the loopback link 22 are located outside the WiFi chip, for example, on the circuit board corresponding to the WiFi chip.

[0101] In yet another example, as shown in Figure 10 The first transmitting chain 21 and the first receiving chain 23 in the apparatus, and the part of devices in the loopback link 22 are located in the WiFi chip, for example, the devices (such as the amplifier AMP) in the first transmitting chain 21 and the first receiving chain 23 before the front end module (FEM) can be located in the WiFi chip, and the FEM in the first transmitting chain 21 and the first receiving chain 23 can be located outside the WiFi chip. For example, the devices in the FEM can include at least one of a power amplifier PA and a switching switch, a low noise amplifier LNA, or a switching switch, etc. Figure 10 In the above examples, the FEM in the transmitting chain and the receiving chain is arranged in the apparatus, and in actual applications, the FEM in the transmitting chain and the receiving chain can also be arranged outside the apparatus, and the embodiments of the present application do not make specific limitations thereto.

[0102] It can be understood that the baseband circuit in the apparatus can be located in the WiFi chip, and the above Figures 7 to 10 does not show the baseband circuit in the WiFi chip.

[0103] Further, the apparatus can further include a control circuit 26, which can be integrated in the WiFi chip or not integrated in the WiFi chip. The control circuit 26 can be specifically used to control the phase and / or amplitude of the first crosstalk cancellation signal output by the loopback link 22. For example, in the above first possible embodiment, the control circuit 26 can be used to control the gain phase adjustment circuit 223 to adjust the phase and / or amplitude of the input signal; or in the second possible embodiment, the control circuit 26 can be used to control the phase and / or amplitude of the signal output by the second transmitting chain 24 to the third coupler 224. Optionally, the control circuit 26 can be a processor or a controller, etc. In the above Figures 6 to 8 , and Figure 10 take the control circuit 26 located in the WiFi chip as an example for illustration.

[0104] Optionally, when the device is used to transmit and receive radar signals, the first transmitting chain 21 and the first receiving chain 23 are further used to transmit the transmitting signal and receive the corresponding receiving signal, respectively; the loopback chain 22 is further used to output multiple crosstalk cancellation signals, the multiple crosstalk cancellation signals having different phases and / or amplitudes; the control circuit 26 is further used to determine multiple direct path powers of the multiple receiving cancellation signals, the multiple receiving cancellation signals being obtained by superimposing the receiving signal with the multiple crosstalk cancellation signals; the control circuit 26 is further used to determine the crosstalk cancellation signal corresponding to the minimum direct path power among the multiple direct path powers as the first crosstalk cancellation signal, the crosstalk cancellation signal corresponding to the minimum direct path power being used to cancel the crosstalk signal. Here, the crosstalk cancellation signal corresponding to the minimum direct path power refers to: when the direct path power of the receiving cancellation signal obtained by superimposing the receiving signal with a certain crosstalk cancellation signal is minimum, the certain crosstalk cancellation signal is superimposed as the crosstalk cancellation signal corresponding to the minimum direct path power. The amplitude and / or phase of the first crosstalk cancellation signal used to cancel the crosstalk signal mentioned above is equal to the phase and / or amplitude of the crosstalk cancellation signal corresponding to the minimum direct path power.

[0105] In one possible embodiment, the loopback link 22 includes a gain controller and a phase shifter, wherein the gain controller is an attenuator. The control circuit 26 controls the attenuator and the phase shifter to control the phase and / or amplitude of the crosstalk cancellation signal output by the loopback link 22. The control process of the control circuit 26 (or the calibration process of the loopback link 22) is described below, taking the example of the control circuit 26 first controlling the phase shifter to adjust the phase and then controlling the attenuator to adjust the amplitude.

[0106] In one example, Figure 11 As shown in (a), the process of the control circuit 26 controlling the phase shifter may include: S11, controlling the device to be in radar transceiver mode; S12, the device using a fast time compression algorithm to send and receive corresponding signals; S13, determining the direct path power according to the received signal; S14, adjusting the phase of the phase shifter according to the obtained direct path power; S15, judging whether the current direct path power is minimum, if so, executing S16, otherwise returning to S11; S16, storing the phase of the phase shifter, that is, setting the phase of the phase shifter to the phase corresponding to the minimum direct path power.

[0107] In another example, Figure 11In (b) of FIG. 6, the control circuit 26 controls the process of the attenuator, which can include: S21, controlling the device to be in radar transceiver mode; S22, the device sends and receives corresponding signals using fast time compression algorithm; S23, determining the direct path power according to the received signal; S24, adjusting the attenuator according to the obtained direct path power; S25, judging whether the current direct path power is the minimum, if yes, executing S26, if not, returning to S21; S26, storing the state of the attenuator, that is, setting the gain corresponding to the current state of the attenuator to the gain corresponding to the minimum direct path power.

[0108] After the control circuit 26 determines the phase of the phase shifter and the gain of the attenuator through the above process, when the device is in the normal signal transceiving mode of radar transceiver mode, the control circuit 26 can adjust the phase and gain determined through the above process to the phase and gain of the phase shifter and the attenuator in normal working state, respectively.

[0109] When the radar transceiver device provided by the embodiments of the present application is used to cancel (or cancel or eliminate) the crosstalk signal, for example, the gain phase adjustment circuit is used to adjust the phase and amplitude, the expected elimination effect is related to the bit width of the gain phase adjustment circuit. For example, in the case of using a 5-bit phase shifter, the crosstalk elimination performance can be improved by more than 18 dBc.

[0110] After the actual test of the device, the schematic diagram of the crosstalk signal of the device in the radar transceiver mode, and the cancellation crosstalk signal obtained after the crosstalk signal and the crosstalk cancellation signal are superimposed can be obtained. For example, in the case of using a 5-bit phase shifter and a 0.5 dB adjustable attenuator to adjust the gain, Figure 12 The schematic diagram of the transmit signal S1, the crosstalk signal S2 and the cancellation crosstalk signal S3 in the device is shown. Among them, Figure 12 (a) of FIG. 7 shows the time domain signal or waveform diagram in time domain (the horizontal coordinate in the figure is time, and the vertical coordinate is amplitude) corresponding to the above S1, S2 and S3, and the noise after the transmission signal S1 stops transmitting; Figure 12 (b) of FIG. 7 shows the waveform diagram of the time domain signal power (that is, the transmission waveform power suppression) of the above S1, S2 and S3 (the horizontal coordinate in the figure is time, and the vertical coordinate is power), and the waveform after the transmission noise base suppression. According to the diagram, it can be seen that the amplitude and power of the cancellation crosstalk signal obtained after the crosstalk signal and the crosstalk cancellation signal in the device are superimposed are greatly reduced.

[0111] In the radar sensing device provided in the embodiments of the present application, the first transmitting link 21 can be used to send a transmitting signal, the loopback link 22 can be used to receive an input signal and output a first crosstalk cancellation signal for the first receiving link 23, the first receiving link 23 can be used to receive the first crosstalk cancellation signal and a receiving signal, and the first crosstalk cancellation signal has a phase opposite to that of a crosstalk signal in the receiving signal and an absolute value of a difference between amplitudes of the first crosstalk cancellation signal and the crosstalk signal is less than a preset value, so that the first crosstalk cancellation signal can be used to reduce or cancel the crosstalk signal of the receiving signal, thereby solving the blocking problem caused by the crosstalk signal and further improving the performance of the device.

[0112] Based on this, the embodiments of the present application further provide a control method of a radar sensing device, the method being applied to the radar sensing device provided above, and the method comprising: the first transmitting link sending a transmitting signal; the loopback link receiving an input signal and outputting a first crosstalk cancellation signal, the input signal being the transmitting signal or a baseband signal corresponding to the transmitting signal; and the first receiving link receiving the first crosstalk cancellation signal and a receiving signal, the receiving signal including a crosstalk signal corresponding to the transmitting signal and an echo signal of the transmitting signal reflected by an obstacle, the first crosstalk cancellation signal having a phase opposite to that of the crosstalk signal, and an absolute value of a difference between amplitudes of the first crosstalk cancellation signal and the crosstalk signal being less than a preset value.

[0113] In a possible embodiment, if the loopback link includes a first coupler, a second coupler, a gain and phase adjustment circuit, a first matching resistor and a second matching resistor, the loopback link receiving an input signal and outputting a first crosstalk cancellation signal comprises: the gain and phase adjustment circuit adjusting a phase and / or an amplitude of the input signal to obtain the first crosstalk cancellation signal.

[0114] In an example, if the gain and phase adjustment circuit includes a gain controller and a phase shifter, the gain and phase adjustment circuit adjusting the phase and / or the amplitude of the input signal comprises: the gain controller adjusting the amplitude of the input signal, and the phase shifter adjusting the phase of the input signal.

[0115] In another example, if the gain and phase adjustment circuit includes a gain-controllable phase shifter, the gain and phase adjustment circuit adjusting the phase and / or the amplitude of the input signal comprises: the gain-controllable phase shifter adjusting the phase and / or the amplitude of the input signal.

[0116] In another possible embodiment, if the loopback link includes a second transmitting link and a third coupler, the second transmitting link being coupled with the first receiving link through the third coupler; the loopback link receiving an input signal and outputting a first crosstalk cancellation signal comprises: the second transmitting link receiving a baseband signal corresponding to the transmitting signal and outputting a coupling signal; and the third coupler receiving the coupling signal and outputting the first crosstalk cancellation signal.

[0117] Furthermore, if the apparatus further includes a control circuit, the method further includes: the control circuit controlling the loopback link to adjust the phase and / or amplitude of the first crosstalk cancellation signal. For example, the control circuit controls the gain controller and the phase shifter to adjust the phase and amplitude of the first crosstalk cancellation signal, respectively; or, the control circuit controls the gain-controllable phase shifter to adjust the phase and amplitude of the first crosstalk cancellation signal; or, the control circuit controls the second transmit link to adjust the phase and amplitude of the first crosstalk cancellation signal.

[0118] Furthermore, the control circuit can also be used to control the device to perform a calibration process to determine the phase and amplitude of the first crosstalk cancellation signal when the device is operating normally. In one possible example, the device is used to send and receive radar signals, and the calibration process includes: when the device sends a transmit signal and receives a corresponding receive signal; the device generates multiple crosstalk cancellation signals, and the phases and / or amplitudes of the multiple crosstalk cancellation signals are different; multiple direct path powers of the multiple receive cancellation signals are determined, and the multiple receive cancellation signals are obtained by superimposing the receive signals with the multiple crosstalk cancellation signals respectively; the crosstalk cancellation signal corresponding to the smallest direct path power among the multiple direct path powers is determined as the first crosstalk cancellation signal. The phase and / or amplitude of the first crosstalk cancellation signal above is equal to the phase and / or amplitude of the crosstalk cancellation signal corresponding to the smallest direct path power.

[0119] In an embodiment of the present application, a crosstalk cancellation signal is output to the first receiving link through the loopback link, so that the first receiving link can receive the first crosstalk cancellation signal and the receiving signal, and the first crosstalk cancellation signal is opposite in phase to the crosstalk signal in the receiving signal, and the absolute value of the difference between the amplitudes is less than a preset value. In this way, the first crosstalk cancellation signal can be used to reduce or cancel the crosstalk signal of the receiving signal, thereby solving the blocking problem caused by the crosstalk signal, and thereby improving the performance of the device.

[0120] In another aspect of the present application, a chip is provided, which includes a circuit board and a radar sensing device arranged on the circuit board. The radar sensing device is any of the radar sensing devices provided above.

[0121] In another aspect of the present application, an electronic device is also provided, such as Figure 13As shown, the electronic device includes a first antenna, a second antenna, and any one of the radar sensing devices provided above; wherein the first antenna can be coupled with the first transmitting link in the device, and the second antenna can be coupled with the first receiving link in the device. Optionally, the electronic device further includes a memory for storing computer instructions, and the radar sensing device is configured to execute the computer instructions to enable the electronic device to implement the control method of any one of the radar sensing devices provided above.

[0122] It can be understood that all related contents of the above device embodiments can be cited in the embodiments of the control method of the radar sensing device and the embodiments of the chip and the electronic device, which will not be described herein again.

[0123] In several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the above-described device embodiments are only schematic, and the division of the modules or units is only a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another device, or some features can be ignored or not executed.

[0124] The units described as separate components can or can not be physically separate, and the components displayed as units can be one physical unit or multiple physical units, that is, can be located in one place, or can be distributed to multiple different places. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiments.

[0125] The integrated unit, if implemented in the form of a software function unit and sold or used as an independent product, can be stored in a readable storage medium, which can include a U disk, a mobile hard disk, a read-only memory, a random access memory, a magnetic disk or an optical disk, and various storage medium that can store program codes. Based on such understanding, the technical solutions of the embodiments of the present application or the essential part or all or part of the technical solutions that contribute to the prior art can be embodied in the form of a software product.

[0126] In another embodiment of the present application, a readable storage medium is provided, which stores computer execution instructions, and when a device (which can be a single-chip microcomputer, a chip, etc.) or a processor executes the steps in the above method embodiments.

[0127] In yet another embodiment of the present application, a computer program product is also provided, which includes a computer program stored in a readable storage medium; at least one processor of a device can read the computer program from the readable storage medium, and when the computer program is executed by the at least one processor, causes the device to perform the steps in the above-mentioned method embodiments.

[0128] Finally, it should be noted that the above-mentioned is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, any change or replacement within the technical scope disclosed in the present application should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A radar sensory device, characterized in that, The device comprises: a first transmitting chain for transmitting a transmitting signal; a loopback chain for receiving an input signal, and outputting a first crosstalk cancellation signal, the input signal being the transmitting signal or a baseband signal corresponding to the transmitting signal; a first receiving chain for receiving the first crosstalk cancellation signal and a receiving signal, the receiving signal comprising a crosstalk signal corresponding to the transmitting signal and a echo signal of the transmitting signal reflected by an obstacle, a phase of the first crosstalk cancellation signal being opposite to a phase of the crosstalk signal, and an absolute value of a difference between an amplitude of the first crosstalk cancellation signal and an amplitude of the crosstalk signal being less than a preset value.

2. The apparatus of claim 1, wherein, The loopback chain comprises a first coupler, a second coupler, a gain and phase adjustment circuit, a first matching resistor and a second matching resistor, one end of the gain and phase adjustment circuit being coupled with an output end of the first transmitting chain and one end of the first matching resistor through the first coupler, the other end of the gain and phase adjustment circuit being coupled with an input end of the first receiving chain and one end of the second matching resistor through the second coupler, the other end of the first matching resistor and the other end of the second matching resistor being coupled with a ground terminal; The gain and phase adjustment circuit is configured to adjust a phase and / or an amplitude of the input signal.

3. The apparatus of claim 2, wherein, The gain and phase adjustment circuit comprises a gain controller and a phase shifter.

4. The apparatus of claim 2, wherein, The gain and phase adjustment circuit comprises a gain-controllable phase shifter.

5. The device of any one of claims 2-4, wherein, The device further comprises: a control circuit configured to control the gain and phase adjustment circuit to adjust the phase and / or the amplitude of the input signal.

6. The apparatus of claim 5, wherein, The device is configured to transmit and receive radar signals. The first transmitting chain and the first receiving chain are further configured to respectively transmit the transmitting signal and receive the receiving signal. The loopback chain is further configured to output a plurality of crosstalk cancellation signals, the plurality of crosstalk cancellation signals having different phases and / or amplitudes. The control circuit is further configured to determine a plurality of direct-path powers of a plurality of receiving cancellation signals, the plurality of receiving cancellation signals being obtained by respectively superimposing the receiving signal and the plurality of crosstalk cancellation signals; The control circuit is further configured to determine, as the first crosstalk cancellation signal, a crosstalk cancellation signal corresponding to a smallest direct-path power in the plurality of direct-path powers.

7. The device of any one of claims 1-6, wherein, The device further comprises at least two transceiving channels, the first transmitting chain and the first receiving chain being located in different transceiving channels of the at least two transceiving channels.

8. The apparatus of claim 1, wherein, The loopback chain comprises a second transmitting chain and a third coupler, the second transmitting chain being coupled with the first receiving chain through the third coupler; The second transmitting chain is configured to receive a baseband signal corresponding to the transmitting signal, and output a coupling signal. The third coupler is configured to receive the coupling signal, and output the first crosstalk cancellation signal.

9. The device of any one of claims 1-8, wherein, The device further comprises a baseband circuit; The loopback chain, the first transmitting chain, the first receiving chain and the baseband circuit are integrated in one chip; or, The loopback link, the part of the first transmitting link except the front-end module, the part of the first receiving link except the front-end module and the baseband circuit are integrated in one chip; or, The loopback link, the front-end module corresponding to the first transmitting link and the front-end module corresponding to the first receiving link are located outside the chip where the baseband circuit is located.

10. A control method of a radar sensor, characterized by, A method for controlling a radar sensing device as claimed in any one of claims 1-9, the device being configured to transmit and receive radar signals, the method comprising: The device transmits a transmitting signal and receives a corresponding receiving signal; The device generates a plurality of crosstalk cancellation signals, the plurality of crosstalk cancellation signals having different phases and / or amplitudes; The device determines a plurality of direct-path powers of a plurality of receiving cancellation signals, the plurality of receiving cancellation signals being obtained by superimposing the receiving signal and the plurality of crosstalk cancellation signals respectively; The device determines a crosstalk cancellation signal corresponding to a minimum direct-path power of the plurality of direct-path powers as a first crosstalk cancellation signal.

11. The method of claim 10, wherein, The device comprises a first transmitting link, a loopback link and a first receiving link, and the method further comprises: The first transmitting link transmits the transmitting signal; The loopback link receives an input signal, and outputs the first crosstalk cancellation signal, the input signal being the transmitting signal or a baseband signal corresponding to the transmitting signal; The first receiving link receives the first crosstalk cancellation signal and the receiving signal respectively, the receiving signal comprising a crosstalk signal corresponding to the transmitting signal and a echo signal of the transmitting signal reflected by an obstacle, the phase of the first crosstalk cancellation signal being opposite to the phase of the crosstalk signal, and the absolute value of the difference between the amplitude of the first crosstalk cancellation signal and the amplitude of the crosstalk signal being less than a preset value.

12. The method of claim 11, wherein, The loopback link comprises a first coupler, a second coupler, a gain and phase adjustment circuit, a first matching resistor and a second matching resistor, one end of the gain and phase adjustment circuit being coupled with an output end of the first transmitting link and one end of the first matching resistor through the first coupler, the other end of the gain and phase adjustment circuit being coupled with an input end of the first receiving link and one end of the second matching resistor through the second coupler, the other end of the first matching resistor and the other end of the second matching resistor being coupled with a ground terminal; The loopback link receives an input signal, and outputs the first crosstalk cancellation signal, comprising: The gain and phase adjustment circuit adjusts the phase and / or amplitude of the input signal to obtain the first crosstalk cancellation signal.

13. The method of claim 12, wherein, The gain and phase adjustment circuit comprises a gain controller and a phase shifter, and the gain and phase adjustment circuit adjusts the phase and / or amplitude of the input signal, comprising: The gain controller adjusts the amplitude of the input signal, and the phase shifter adjusts the phase of the input signal.

14. The method of claim 12, wherein, The gain and phase adjustment circuit comprises a gain-controllable phase shifter, and the gain and phase adjustment circuit adjusts the phase and / or amplitude of the input signal, comprising: The gain-controllable phase shifter adjusts the phase and / or amplitude of the input signal. The device further comprises a control circuit, and the method further comprises:

15. The method according to any one of claims 12-14, characterized in that, The control circuit controls the gain and phase adjustment circuit to adjust the phase and / or amplitude of the input signal. The control circuit controls the gain-phase adjustment circuit to adjust the phase and / or amplitude of the input signal.

16. The method of claim 11, wherein, The loopback link comprises a second transmit chain and a third coupler, the second transmit chain being coupled with the first receive chain through the third coupler; The loopback link receives an input signal, and outputs the first crosstalk cancellation signal, comprising: The second transmit chain receives a baseband signal corresponding to the transmit signal, and outputs a coupling signal; The third coupler receives the coupling signal, and outputs the first crosstalk cancellation signal.

17. A chip, characterized by The chip comprises a circuit board, and the radar sensing device as claimed in any one of claims 1-9 disposed on the circuit board.

18. An electronic device, comprising: The electronic device comprises a first antenna, a second antenna, and the radar sensing device as claimed in any one of claims 1-9, the first antenna being coupled with the first transmit chain in the device, and the second antenna being coupled with the first receive chain in the device.

19. A computer-readable storage medium, characterized in that, The computer readable storage medium stores computer instructions, which, when executed on a device, cause the device to perform the method as claimed in any one of claims 10-16.

20. A computer program product, characterised in that, The computer program product comprises a computer program, which, when executed by a device, causes the device to perform the method as claimed in any one of claims 10-16.

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