Accessory for realizing speed measurement by using radar technology

Abstract

The invention discloses an accessory for realizing speed measurement by using a radar technology, and belongs to the field of speed measurement. The accessory mainly comprises a radar, the size of the radar does not exceed that of the mobile phone, the radar is used for measuring and calculating the speed of a target object, and the radar is communicated with the mobile phone to transmit the speed of the target object to the mobile phone so as to record, display, count and trigger video recording and storage functions in the mobile phone; and the fixing part is connected with the radar and fixes the radar on the mobile phone, so that the accessory and the mobile phone are integrated. According to the invention, the speed of the target object can be recorded and measured by using the mobile phone in a portable manner.

Description

Technical Field

[0001] This application relates to the technical field of speed measurement, and particularly to a component for implementing speed measurement using radar technology. Background Art

[0002] With the rapid development of smart phones, people can obtain a large amount of information based on the sound and images of the phones. However, due to the lack of required sensors, the phones cannot accurately measure the moving speed of external objects.

[0003] In the prior art, devices such as Doppler radar or millimeter-wave radar are usually used to measure the speed of objects. However, due to limitations such as volume, power consumption, and cost, these devices are usually not installed on existing phones. Therefore, existing phones cannot complete accurate measurement of the speed of external objects. Summary of the Invention

[0004] Aiming at the problem in the prior art that accurate measurement of the speed of external objects cannot be completed, this application mainly provides a component for implementing speed measurement using radar technology and its speed measurement method.

[0005] To achieve the above object, the first technical solution adopted in this application is: A component for implementing speed measurement using radar technology, which includes: a radar, the size of which does not exceed that of a mobile phone, measures and calculates the speed of a target object through the radar, and communicates with the mobile phone to transmit the speed of the target object to the mobile phone for recording, displaying, and statistics in the mobile phone, and triggering the video recording and storage functions; a fixing component, which is connected to the radar and fixes the radar on the mobile phone to integrate the component with the mobile phone.

[0006] Optionally, the mobile phone component is fixed on the mobile phone by magnetic attraction or clamping.

[0007] Optionally, the mobile phone component interacts with the mobile phone through communication methods such as Bluetooth transmission, USB transmission, or Wi-Fi transmission.

[0008] Optionally, the radar includes: a radar signal transmitting module, which generates electromagnetic waves, amplifies the electromagnetic waves to obtain transmitted electromagnetic waves, and radiates the transmitted electromagnetic waves into the scene space through an antenna; a radar signal receiving module, which receives the reflected echo of the target object, mixes it with the transmitted electromagnetic waves to generate an intermediate frequency signal, and converts the intermediate frequency signal into a digital signal through an analog-to-digital conversion circuit; a speed calculation module, which calculates the speed of the target object using the digital signal through the Doppler principle; and a communication module, which transmits the speed of the target object to the mobile phone for recording, displaying, and statistics in the mobile phone, and triggering the video recording and storage.

[0009] Optionally, while the radar radiates electromagnetic waves into the scene space, the mobile phone is used to collect image information of the target object; and when recording information in the mobile phone, the image information of the target within the first predetermined time point before the moment of transmitting the electromagnetic wave to the second predetermined time point after the moment of transmitting the electromagnetic wave recorded by the mobile phone is saved.

[0010] Optionally, after receiving the reflected echo and converting the reflected echo into a digital signal, a Fourier transform is performed on the digital signal; according to the Fourier transform result, through a constant false alarm rate detection, it is determined whether the returned reflected echo is the reflected echo of a moving target object, and when the reflected echo is the reflected echo of a moving target object, the speed of the target object is calculated.

[0011] Optionally, according to the Fourier transform result, through a constant false alarm rate detection, determining whether the returned reflected echo is the reflected echo of a moving target object includes: determining the magnitude relationship between the Fourier transform result and a predetermined noise level value, and when the Fourier transform result is higher than the predetermined noise level value, taking the reflected echo at this time as the reflected echo of the target object of interest; determining whether the time-frequency graph of the Doppler frequency of the reflected echo of the target object of interest conforms to the object motion characteristics, and when the time-frequency graph of the Doppler frequency of the reflected echo of the target object of interest conforms to the object motion characteristics, taking the reflected echo as the reflected echo of a moving target object.

[0012] Optionally, on the mobile phone side, multiple frames of images of the target object of interest are obtained through a camera, and target detection is performed on the multiple frames of images of the target object of interest, so as to determine whether to trigger the radar to measure the speed of the target object or determine whether to receive the speed information of the target object transmitted from the radar to the mobile phone, where the target detection includes determining whether there is a target object in the image of the target object of interest, or confirming whether there is a scene that requires speed measurement.

[0013] Optionally, after confirming that there is a target object of interest or an interesting scene in the image, the mobile phone processes the image to identify the pixel set of the target object in the multiple frames of images of the target object of interest, and performs position and speed measurement according to the sequence characteristics of the pixel set of the target object in the multiple frames of images. Among them, the process of performing position and speed measurement according to the sequence characteristics of the pixel set of the target object in the multiple frames of images includes confirming the pixel area size and the center position of the pixel area of the target object in the multiple frames of images, and calculating the position and speed of the target object based on the previous calibration and in combination with the frame interval of the image for supplementing the speed measurement of the radar accessory; and saving or analyzing the pixel set of the target object identified on the mobile phone side to provide additional information about the target object to the user, where the additional information about the target object includes the posture of the pitcher.

[0014] Optionally, the position and velocity of the target object calculated based on the image are fused with the velocity of the target object of interest detected by the radar to obtain a more accurate measurement result. The beneficial effects that can be achieved by the technical solution of this application are: realizing the accurate measurement of the velocity of the target object by using a mobile phone through a mobile phone accessory.

[0015] The beneficial effects that can be achieved by the technical solution of this application are: realizing the accurate measurement of the velocity of the target object by using a mobile phone through a mobile phone accessory. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 It is a schematic diagram of a specific implementation manner of an accessory for speed measurement using radar technology in the present application;

[0018] Figure 2 It is a schematic diagram of the application scenario of the present application;

[0019] Figure 3 It is a schematic diagram of the functional structure of an accessory for speed measurement using radar technology in the present application;

[0020] Figure 4 It is a schematic diagram of the working process of an accessory for speed measurement using radar technology;

[0021] Figure 5 It is a schematic diagram of the Doppler frequency measurement result of the present application;

[0022] Figure 6 It is a schematic diagram of the display result of the mobile phone application interface of the present application.

[0023] Through the above-mentioned drawings, the clear embodiments of the present application have been shown, and there will be more detailed descriptions hereinafter. These drawings and the text description are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The following will elaborate on the preferred embodiments of the present application in conjunction with the drawings, so that the advantages and features of the present application can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present application.

[0025] It should be noted that in this text, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0026] Application scenarios: This application is mainly applied to the measurement of the maximum speed of balls such as baseballs, golf balls, tennis balls, etc., and can also be used in scenarios such as measuring vehicle speeds and running speeds.

[0027] Background art: The inventive principle of this application is that the radar emits electromagnetic waves, which hit an object moving relative to the radar and reflect back to form a reflected echo. The reflected echo is received by the radar, and there is a difference between the frequency of the reflected echo and the transmitted wave, and this difference is proportional to the relative speed. Using this principle, the radar can measure the speeds of various moving objects, including the speeds of balls in sports, the speeds of vehicles in traffic, the flying speeds of bullets, and so on.

[0028] Doppler principle: The frequency of the reflected wave changes due to the radial velocity of the reflecting object and the radar, and the relationship between the two is:

[0029]

[0030] The Doppler frequency is the difference between the frequency of the reflected wave and the transmitted wave, and can be obtained by a mixer in the circuit:

[0031]

[0032] Since generally v << c, so

[0033]

[0034] where f t ,f r ,f d ,v, c are respectively the frequency of the transmitted electromagnetic wave, the frequency of the reflected echo, the Doppler frequency, the speed of the object and the speed of light.

[0035] According to the above principle, the speed of the target object can be calculated using the frequency of the transmitted electromagnetic wave emitted by the radar and the frequency of the reflected echo.

[0036] Next, specific embodiments will be used to describe in detail the technical solutions of the present application and how the technical solutions of the present application solve the above technical problems. Among them, the specific embodiments described below can be combined with each other to form new embodiments. For the same or similar ideas or processes described in one embodiment, they may not be repeated in some other embodiments.

[0037] Figure 1 An embodiment of an accessory for speed measurement using radar technology in the present application is shown.

[0038] Figure 1 The accessory for speed measurement using radar technology shown includes: a radar, the size of which does not exceed that of a mobile phone, which measures and calculates the speed of a target object through the radar, and which transmits the speed of the target object to the mobile phone through communication with the mobile phone for recording, displaying, and statistics in the mobile phone, and triggering the video recording and storage functions; a fixing component, which is connected to the radar and fixes the radar on the mobile phone so that the accessory is integrated with the mobile phone.

[0039] In this specific embodiment, the mobile phone accessory is used to accurately measure the speed of a target object using the mobile phone and record it, so that users such as sports enthusiasts can more conveniently measure the speed of the target object and perform operations such as action correction based on the corresponding image information.

[0040] Specifically, millimeter-wave radar has the advantages of short wavelength, small size of components and antennas, and easy miniaturization. Therefore, it meets the conditions for being a mobile phone accessory. And Doppler radar can use the Doppler principle to measure the speed of an object moving relative to the radar, and has stronger speed calculation ability.

[0041] Based on the above small radar, the present application provides an accessory for a mobile phone that can accurately measure speed. The accessory includes a radar and a fixing component, which measures and calculates the speed of a target object through the radar, and which transmits the speed of the target object to the mobile phone through communication with the mobile phone for recording, displaying, and statistics in the mobile phone, and triggering the video recording and storage functions; the fixing component is connected to the radar to form an integral structure, which fixes the radar on the mobile phone so that the accessory is integrated with the mobile phone, realizing convenient and fast measurement of the speed of a target object using the mobile phone. At the same time, by combining and connecting the accessory with a smart phone, the camera and computing and storage capabilities of the mobile phone can be utilized during speed measurement, realizing the combination of the radar speed measurement ability and the mobile phone video analysis ability, and being able to better achieve speed measurement, recording, and analysis.

[0042] In a specific embodiment of the present application, the mobile phone accessory is fixed on the mobile phone by a magnetic attraction or clamping method.

[0043] Specifically, the mobile phone accessory of the present application can be fixed to the mobile phone by magnetic attraction or clamping. The portable device composed of the mobile phone and the mobile phone accessory can be fixed by means such as hand-holding, tripod support, and tying to a railing, etc., so as to better measure the speed.

[0044] For example, Figure 2 is a schematic diagram of the application scenario of the present application. As Figure 2 shown, the mobile phone accessory is fixed to the back of the mobile phone by magnetic attraction. By fixing the mobile phone accessory to the mobile phone, it is possible to more conveniently use the mobile phone to measure the speed of the target object. In the actual application process, the speed measurement accessory can also be inserted into the USB port of the mobile phone, etc. to achieve fixation and connection. The specific fixation method is not limited in the present application. In a specific embodiment of the present application, the radar includes: a radar signal transmitting module, which generates electromagnetic waves, amplifies the electromagnetic waves to obtain transmitted electromagnetic waves, and radiates the transmitted electromagnetic waves into the scene space through an antenna; a radar signal receiving module, which receives the reflected echo of the target object, mixes it with the transmitted electromagnetic waves to generate an intermediate frequency signal, and converts the intermediate frequency signal into a digital signal through an analog-to-digital conversion circuit; a speed calculation module, which calculates the speed of the target object using the digital signal through the Doppler principle; and a communication module, which transmits the speed of the target object to the mobile phone and records, displays, and statistically processes it in the mobile phone, and triggers video recording and storage.

[0045] Specifically, Figure 3 is a schematic diagram of the functional structure of an accessory for speed measurement using radar technology in the present application. As Figure 3 shown, the transmitting module of the mobile phone accessory of the present application generates electromagnetic waves, amplifies the electromagnetic waves to a certain power level, and radiates the electromagnetic waves into the space through the transmitting antenna of the radar, so that the electromagnetic waves propagate in the space and reflect electromagnetic waves with objects. Then, the receiving module of the mobile phone accessory uses the receiving antenna of the radar to receive the reflected echoes of vehicles, balls, etc., mixes the reflected echoes with the transmitted electromagnetic waves through an amplifier, mixer, etc. to obtain an intermediate frequency signal, and then converts the intermediate frequency signal into a digital signal through an analog-to-digital converter. Then, the calculation module (usually an MCU or other embedded processor) receives the ADC data, and finally calculates the target speed information according to the Doppler principle. Among them, Figure 3 the power supply module in

[0046] In a specific embodiment of the present application, after receiving the reflected echo and converting the reflected echo into a digital signal, a Fourier transform is performed on the digital signal; according to the Fourier transform result, through constant false alarm rate detection, it is determined whether the returned reflected echo is the reflected echo of a moving target object, and when the reflected echo is the reflected echo of a moving target object, the speed of the target object is calculated. Further, according to the Fourier transform result, through constant false alarm rate detection, determining whether the returned reflected echo is the reflected echo of a moving target object includes: determining the magnitude relationship between the Fourier transform result and a predetermined noise level value, and when the Fourier transform result is higher than the predetermined noise level value, regarding the reflected echo at this time as the reflected echo of the target object of interest; determining whether the time-frequency graph of the Doppler frequency of the reflected echo of the target object of interest conforms to the object motion characteristics, and when the time-frequency graph of the Doppler frequency of the reflected echo of the target object of interest conforms to the object motion characteristics, regarding the reflected echo as the reflected echo of a moving target object.

[0047] Specifically, Figure 4 is a schematic diagram of the working process of a component for speed measurement using radar technology, as Figure 4 shown. After the radar is turned on and connected to the mobile phone, the user clicks to start the measurement mode through the mobile phone operation interface as Figure 6 shown. At this time, the radar carried by the mobile phone component has entered the working state and continuously emits electromagnetic waves into space. At this time, the calculation system will continuously calculate the FFT transform (Fourier transform) of the echo ADC data. Figure 5 is a schematic diagram of the Doppler frequency measurement result of the present application, as Figure 5 shown. Based on the FFT transform result, CFAR detection (constant false alarm rate detection) is performed. Once the radar in the component detects that the FFT transform result of the reflected echo is higher than the noise level, it is considered that the reflected echo is a Doppler frequency with a higher confidence level. At the same time, when the time-frequency graph of this Doppler frequency with a higher confidence level conforms to the characteristics of a ball flying at high speed after being hit or conforms to the motion characteristics of a moving object, the maximum speed of the target object corresponding to the reflected echo is calculated. In a specific embodiment of the present application, the mobile phone component interacts with the mobile phone through a communication method of Bluetooth transmission, USB transmission, or Wi-Fi transmission.

[0048] Specifically, after the mobile phone component receives the reflected echo reflected by the target object, it calculates the maximum speed of the target object, and then uses the communication module of the mobile phone component to transmit the speed information to the smart phone and trigger functions such as video recording and speed display of the smart phone. Among them, the way for the mobile phone component to interact with the mobile phone can be in the way of Bluetooth transmission, USB transmission, or Wi-Fi transmission, and the specific communication method is not limited in the present application.

[0049] In a specific embodiment of the present application, while using a radar to radiate electromagnetic waves into the scene space, an image information of a target object is collected by a mobile phone; and when information is recorded in the mobile phone, the image information of the target within a first predetermined time point before the moment of the emitted electromagnetic wave to a second predetermined time point after the moment of the emitted electromagnetic wave recorded by the mobile phone is saved.

[0050] Specifically, while using a radar to radiate electromagnetic waves into the scene space, an image information of a target object is collected by a mobile phone to ensure that the image information of the target object collected by devices such as the camera of the mobile phone and the target object collected and calculated by the radar are the same object, and at the same time, it is also convenient for the user to view information such as videos and images of the measured target object. At the same time, when information is recorded in the mobile phone, the image information of the target within a first predetermined time point before the moment of the emitted electromagnetic wave to a second predetermined time point after the moment of the emitted electromagnetic wave recorded by the mobile phone is saved to ensure that the image information of the target object stored in the mobile phone can completely reflect the movement process of the target object.

[0051] In a specific embodiment of the present application, on the mobile phone side, multiple frames of images of a target object of interest are obtained through a camera, and target detection is performed on the multiple frames of images of the target object of interest, so as to determine whether to trigger the radar to measure the speed of the target object or determine whether to receive the speed information of the target object transmitted from the radar to the mobile phone, wherein the target detection includes determining whether there is a target object in the image of the target object of interest or confirming whether there is a scene that requires speed measurement.

[0052] Specifically, on the mobile phone side, multiple frames of images of the target object of interest are obtained through the camera, and the multiple frames of images of the target object of interest are subjected to object detection to determine whether there is a target object in the image of the target object of interest, or to confirm whether there is a scenario that requires speed measurement. For example, when measuring the speed of a vehicle, it is confirmed that there is a vehicle in the image; when measuring the speed of a baseball, it is confirmed whether the pitcher has made a pitching motion. When it is confirmed that the image contains a target object or there is an application scenario that requires speed measurement, the speed measurement function of the radar for the target object is triggered, or the speed information of the target object transmitted by the radar to the mobile phone is received. Among them, the detection of the target object of interest based on the mobile phone image mainly has three functions. One is to reduce the false triggering caused by non-target moving objects for the radar accessory; another is to provide additional information to the user, such as the posture of the pitcher, the license plate, etc.; the last one is to measure the position and speed according to the sequence characteristics of the pixel set of the target object of interest in multiple frames of images, and compare and fuse the position and speed information measured by the image with the radar measurement result, so as to improve the accuracy of the measurement result. Therefore, the present application combines the analysis of the image information of the target object, which can reduce the false triggering caused by non-target moving objects for the radar accessory, and store the pixel set of the target object identified on the mobile phone side. The stored image information can be played back or analyzed, etc., so as to provide additional information to the user, such as the action of the batter, the license plate model of the moving vehicle, etc.

[0053] In a specific embodiment of the present application, after it is confirmed that there is a target object of interest or an interesting scenario in the image, the pixel set of the target object in the multiple frames of images of the target object of interest is identified by the mobile phone processing the image, and the position and speed are measured according to the sequence characteristics of the pixel set of the target object in the multiple frames of images. Among them, the process of measuring the position and speed according to the sequence characteristics of the pixel set of the target object in multiple frames of images includes confirming the pixel area size and the center position of the pixel area of the target object in multiple frames of images, and calculating the position and speed of the target object based on the previous calibration and combined with the frame interval of the image for supplementing the speed measurement of the radar accessory; and saving or analyzing the pixel set of the target object identified on the mobile phone side to provide additional information about the target object to the user, where the additional information about the target object includes the posture of the pitcher.

[0054] In a specific embodiment of the present application, the pixels of the target object identified on the mobile phone side are confirmed and analyzed to facilitate the radar accessory to reduce the detection triggered by the movement of non-target objects, and the pixel set of the target object identified on the mobile phone side is saved and further analyzed to provide additional information about the target object to the user, where the additional information about the target object includes the posture of the pitcher.

[0055] Specifically, on the mobile phone side, multiple frames of images of the target object of interest are obtained through the mobile phone camera, and object detection is performed on multiple frames of detection of the target object of interest to identify the pixel set of the target object in the target object of interest. The position and speed of the target object based on the image are measured using the multiple-frame detection results of the target object with the image, and then the speed of the target object calculated based on the image and the speed of the target object calculated based on the radar are used to determine the accurate speed of the target object. Among them, the process of measuring the speed using the multiple-frame detection results of the target object with the image includes confirming the pixel area size and the center position of the pixel area of the target object in multiple frames of images, and calculating the speed of the target object based on the previous calibration and in combination with the frame interval of the image. For example, according to the characteristic that an object appears larger when it is closer and smaller when it is farther away in the image, the distance of the target object is discriminated using the pixel area size; the speed of the object is judged according to the rate of change of the pixel area size in multiple frames; the speed of the object is judged based on the position of the pixel area center and its change.

[0056] The speed and position of the target object calculated based on the image are fused with the speed of the target object of interest detected by the radar to obtain a more accurate measurement result.

[0057] Since image information projects the three-dimensional world onto a two-dimensional plane, the distance and speed information of the target object obtained using image information often has large errors, which is also the technical problem that the radar accessory of this application needs to solve. However, the information of the image is richer, and its detection of whether there is a moving object can make up for the disadvantage that the radar cannot determine the type of the moving object, thereby reducing the false alarm rate of the radar. In this application, on the mobile phone, the additional information of the target object collected by the mobile phone camera and the speed detection result of the radar are fused to obtain a more accurate measurement result, and the fusion method includes Kalman filtering.

[0058] In an example of this application, when detecting ball games, it is detected in advance through the image whether there is a pitcher and a ball to avoid false triggering of the radar measurement. Further, it can also be detected whether the pitcher makes a throwing gesture to determine whether there will be a movement of the ball. Through these detections, the false triggering of the radar detection function can be excluded because the radar can only measure the speed information of the object. In actual scenarios, there will be some moving objects that the user is not interested in, such as a ball thrown by another pitcher flying in front of the radar, or a bird flying in the scene, the movement of trees, etc. In these situations, due to the working characteristics of the radar, it may be misjudged and trigger the work. At this time, the secondary judgment of the existence and position rationality of the target object by the camera can effectively reduce the false triggering of the device's work, thereby saving the energy of the accessory, reducing unnecessary computing power waste, avoiding not collecting the speed of the target object that really needs to be detected, and avoiding the interference brought to the user by invalid measurements.

[0059] In a specific embodiment of the present application, the smart phone of the present application is equipped with application software, which can receive radar information, interact with the radar for control, display information, and call resources such as the mobile phone camera. The display result of the application interface of the mobile phone can be Figure 6 What is displayed can also be other styles.

[0060] In practical applications, such as Figure 4 As shown, when the user clicks to start the measurement mode through the mobile phone operation interface as shown in Figure 6 As shown, after the radar starts to generate electromagnetic waves of a predetermined power and the mobile phone starts to take pictures and record at the same time, after the mobile phone receives the maximum speed of the target object transmitted by the radar, it saves the corresponding video information or image information of the object obtained by the shooting. That is, the present application uses a synchronous camera to record a certain number of frames of video as the motion information video of the object for storage (generally 10-50 frames, and the specific value can be set according to the user's needs, and the present application does not make any restrictions). At the same time, in order to record the video of the movement process of hitting balls and other sports completely, it is necessary to perform a certain pre-buffering on the video. Therefore, after the recording function is triggered, the movement states of the object for a period of time before and after the trigger function can be stored, rather than only storing after the trigger, so that the action information before the ball is released, such as swinging the club and throwing the ball, can be recorded, so as to better analyze the complete movement state of the object.

[0061] In a specific embodiment of the present application, each functional module in an accessory for speed measurement using radar technology in the present application can be directly in hardware, in a software module executed by a processor, or in a combination of both.

[0062] The software module can reside in a RAM memory, a flash memory, a ROM memory, an EPROM memory, an EEPROM memory, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. The exemplary storage medium is coupled to the processor such that the processor can read information from and write information to the storage medium.

[0063] The processor may be a Central Processing Unit (CPU), or may also be other general-purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic, discrete hardware components, or any combination thereof. The general-purpose processor may be a microprocessor, but in an alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in combination with a DSP core, or any other such configuration. In an alternative, the storage medium may be integrated with the processor. The processor and the storage medium may reside in an ASIC. The ASIC may reside in a user terminal. In an alternative, the processor and the storage medium may reside in the user terminal as discrete components.

[0064] In several embodiments provided in this application, it should be understood that the disclosed apparatus and method can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For example, the division of the units is only a logical function division, and there may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces. The indirect coupling or communication connection of the apparatus or unit can be in electrical, mechanical, or other forms.

[0065] The units described as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0066] The above are only the embodiments of this application, and do not limit the patent scope of this application. Any equivalent structural transformation made by using the specification and drawings of this application, or directly or indirectly applied in other related technical fields, is equally included in the patent protection scope of this application.

Claims

1. An accessory for speed measurement using radar technology, characterized in that: include: A radar, which is no larger than a mobile phone, measures and calculates the speed of a target object through the radar, and transmits the speed of the target object to the mobile phone by communicating with the mobile phone so as to record, display, count, and trigger video recording and storage functions in the mobile phone; A fixing component is connected to the radar and fixes the radar on the mobile phone so that the accessory is integrated with the mobile phone.

2. The accessory for speed measurement using radar technology according to claim 1, characterized in that: The mobile phone accessories are fixed on the mobile phone by means of magnetism or clamps.

3. The accessory for speed measurement using radar technology according to claim 1, characterized in that: The mobile phone accessory exchanges information with the mobile phone via a communication method such as Bluetooth transmission, USB transmission or WiFi transmission.

4. The accessory for speed measurement using radar technology according to claim 1, characterized in that: The radar comprises: a radar signal transmitting module, which generates electromagnetic waves, amplifies the electromagnetic waves to obtain transmitting electromagnetic waves, and radiates the transmitting electromagnetic waves into the scene space through an antenna; A radar signal receiving module receives the reflected echo of the target object and mixes it with the transmitted electromagnetic wave to generate an intermediate frequency signal, and converts the intermediate frequency signal into a digital signal through an analog-to-digital conversion circuit; a speed calculation module, which uses the digital signal to calculate the speed of the target object through the Doppler principle; and The communication module transmits the speed of the target object to the mobile phone, and records, displays, and counts the speed in the mobile phone, triggering video recording and storage.

5. The accessory for speed measurement using radar technology according to claim 1, characterized in that: While using the radar to radiate the emitted electromagnetic waves into the scene space, the mobile phone is used to collect image information of the target object; and when recording information in the mobile phone, the image information of the target within a period from a first predetermined time point before the moment of emitting the electromagnetic waves to a second predetermined time point after the moment of emitting the electromagnetic waves recorded by the mobile phone is saved.

6. The accessory for speed measurement using radar technology according to claim 1, characterized in that: After receiving the reflected echo and converting the reflected echo into a digital signal, performing Fourier transform on the digital signal; According to the Fourier transform result, through constant false alarm rate detection, it is determined whether the returned reflected echo is a reflected echo of the moving target object, and when the reflected echo is a reflected echo of the moving target object, the speed of the target object is calculated.

7. The accessory for speed measurement using radar technology according to claim 6, characterized in that: The method of judging whether the returned reflected echo is a reflected echo of a moving target object by constant false alarm rate detection according to the Fourier transform result includes: Determining the magnitude relationship between the Fourier transform result and a predetermined noise level value, and when the Fourier transform result is higher than the predetermined noise level value, taking the reflected echo at this time as the reflected echo of the target object of interest; It is determined whether the time-frequency graph of the Doppler frequency of the reflected echo of the target object of interest meets the object motion characteristics, and when the time-frequency graph of the Doppler frequency of the reflected echo of the target object of interest meets the object motion characteristics, the reflected echo is used as the reflected echo of the moving target object.

8. The accessory for speed measurement using radar technology according to claim 7, characterized in that: On the mobile phone side, multiple frames of images of a target object of interest are obtained through a camera, and target detection is performed on the multiple frames of images of the target object of interest to determine whether to trigger the radar to measure the speed of the target object or determine whether to receive the speed information of the target object transmitted to the mobile phone by the radar, wherein the target detection includes determining whether there is a target object in the image of the target object of interest, or confirming whether there is a scene requiring speed measurement.

9. The accessory for speed measurement using radar technology according to claim 7, characterized in that: After confirming that there is a target object of interest or a scene of interest in the image, the pixel set of the target object in the multiple-frame images of the target object of interest is identified by processing the image with a mobile phone, and the position and speed are measured according to the sequence characteristics of the pixel set of the target object in the multiple-frame images, wherein the process of measuring the position and speed according to the sequence characteristics of the pixel set of the target object in the multiple-frame images includes: confirming the pixel area size and the center position of the pixel area of ​​the target object in the multiple-frame images, and calculating the position and speed of the target object based on the previous calibration and in combination with the frame interval of the image to supplement the speed measurement of the radar accessory; and, saving or analyzing the pixel set of the target object identified on the mobile phone side to provide the user with additional information of the target object, wherein the additional information of the target object includes the posture of the pitcher.

10. The accessory for speed measurement using radar technology according to claim 8, characterized in that: The position and velocity of the target object obtained by image calculation are fused with the velocity of the target object of interest obtained by radar detection to obtain a more accurate measurement result.

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