CN219245760U - Vehicle-mounted Doppler radar detector and detector array - Google Patents

Abstract

The utility model discloses a vehicle-mounted Doppler radar detector and a detector array formed by the same. The detector comprises a housing for mounting and securing the internal components thereof and is capable of being secured to and moved along a track with a rail vehicle. The internal components comprise a Doppler radar transmitting and receiving control main board component (13) and a Doppler radar antenna component (15). The control main board assembly (13) is used for transmitting radar beams to the track through the Doppler radar antenna assembly (15) and receiving radar beam reflection signals to generate radar data. The radar data includes Doppler characteristic information for judging the state of the detection target. The utility model can detect the current health state of locomotives, rails and roadbeds and the long-term change trend thereof.

Description

Vehicle-mounted Doppler radar detector and detector array

Technical Field

The utility model relates to the field of rail traffic detection, in particular to a vehicle-mounted Doppler radar detector and a vehicle-mounted Doppler radar detector array, which are used for detecting the running state of a rail vehicle or the health state of a rail and a roadbed.

Background

The existing Doppler radar detector used in the traffic detection field is generally used for vehicle speed measurement. For example, the chinese utility model with the authorized bulletin number CN213935186U discloses a portable mobile radar velocimeter, which comprises a bracket and a velocimeter housing installed on the bracket, wherein a main board and a radar connected with the main board are arranged in the velocimeter housing, a liquid crystal touch screen and a switching power supply connected with the main board are arranged on the velocimeter housing, a high-definition camera connected with the main board in communication and a wireless network card connected with the high-definition camera in communication are installed on the top of the velocimeter housing, and the radar can perform velocity measurement on a vehicle and output speed information of a target vehicle, so that the high-definition camera is directly driven to perform snapshot.

However, the Doppler radar detector has low detection precision, and can only realize dynamic snapshot of traffic illegal behaviors such as overspeed, road occupation and the like of a running vehicle, and can not dynamically detect the condition of a traffic road. With the construction of high-speed railways and the development of urban subway traffic, rail traffic is becoming more popular. The buckle plate fastener and the threaded spike of the track are one of key components of a track system, and the running safety of vehicles of the whole track system is related. The hidden danger of driving can be generated by the loss and the displacement of the buckle plate fastener and the threaded screw. In addition, foreign objects and foreign objects on the foundation and track can also cause safety hazards in locomotive operation. Therefore, there is a need for a doppler radar detection device that can monitor the current health status of a locomotive and its track along the track and roadbed and its long-term trend of change.

Disclosure of Invention

First, the technical problem to be solved

The utility model aims to solve the problem that the existing Doppler radar detector cannot monitor the current health state of a locomotive and a track along the line of the locomotive and a roadbed and the long-term change trend of the current health state.

(II) technical scheme

In order to solve the technical problem, the utility model provides a vehicle-mounted Doppler radar detector, which comprises a shell, a detection device and a detection device, wherein the shell is used for installing, fixing and protecting internal elements of the shell, and the shell can be fixed on a rail vehicle and move along the rail along with the rail vehicle; the internal element comprises a Doppler radar emission and reception control main board component and a Doppler radar antenna component; the Doppler radar transmitting and receiving control main board assembly is used for transmitting radar beams to the track through the Doppler radar antenna assembly and receiving radar beam reflection signals to generate radar data, the radar data comprise Doppler characteristic information, and the Doppler characteristic information is used for judging the state of a detection target.

According to a preferred embodiment of the present utility model, the doppler radar transmission and reception control main board assembly includes a radar detection chip integrated with radar beam transmission and reception functions and radar data processing functions.

According to a preferred embodiment of the present utility model, the doppler radar transmission and reception control main board assembly includes a radar transceiver having radar beam transmission and reception functions and a data processor having radar data processing functions.

According to a preferred embodiment of the present utility model, the internal components further include a doppler radar core motherboard assembly including a main control chip for controlling the operation of the other internal components.

According to a preferred embodiment of the present utility model, the main control chip is further configured to process the radar data to generate local operation data.

According to a preferred embodiment of the present utility model, the doppler radar deck assembly further comprises a memory for storing said radar data and/or said local operation data.

According to a preferred embodiment of the present utility model, the internal components further comprise a communication module and an I/O interface for transmitting the radar data and the local operation data to other devices or servers by wired or wireless means.

According to a preferred embodiment of the utility model, the internal components further comprise a power management module assembly for providing electrical power to the other internal components.

According to a preferred embodiment of the present utility model, the doppler radar antenna assembly includes an array antenna using DDMA waveforms supporting MIMO radar waveforms.

A second aspect of the utility model proposes a vehicle-mounted doppler radar detector array consisting of a plurality of radar detectors mounted to the same rail vehicle.

(III) beneficial effects

According to the utility model, the Doppler radar transmitting and receiving control main board component and the Doppler radar antenna component for detecting the track state are integrated in one device, so that the device is regular in appearance, complete in function and convenient to install.

The vehicle-mounted Doppler radar detector comprises the array antenna, so that a plurality of vehicle-mounted Doppler radar detectors can conveniently form a detector array, and the detection range and the detection precision are improved.

The utility model realizes the high-speed detection of the moving target in the radial direction of the radar caliber by utilizing the Doppler effect of the radar. By combining the characteristics of the rail, the rail health states such as the loss, displacement, rail missing and foreign matters and abnormal movement on the rail and the like of the buckle fasteners, the nut screws on the rail can be monitored and positioned on a train moving at a high speed.

Drawings

Figure 1 is an overall block diagram of an embodiment of the vehicle-mounted doppler radar detector of the present utility model.

Figure 2 is an exploded view of the internal structure of an embodiment of the vehicle-mounted doppler radar detector of the present utility model.

Figure 3 is a cross-sectional view of an embodiment of the vehicle-mounted doppler radar detector array of the present utility model mounted at the bottom of a train above a rail.

Fig. 4 is a schematic diagram of a failure of the iron track nut to loosen causing rotation of the track buckle in an embodiment of the vehicle-mounted doppler radar detector of the present utility model.

Figure 5 is a schematic diagram of the entire column installation of the vehicle-mounted doppler radar detection array of the present utility model.

Detailed Description

Hereinafter, the in-vehicle doppler radar detection apparatus, array, and method of the present utility model will be described in detail with reference to exemplary embodiments. Like elements in the drawings are labeled with like reference numerals.

Detailed illustrative embodiments are disclosed in the present utility model. However, specific structural and functional details disclosed herein are merely representative for purposes of describing example embodiments. This utility model may, however, be embodied in many alternate forms and should not be construed as limited to only the embodiments set forth herein.

Thus, while the exemplary embodiments are capable of various modifications and alternative forms, these embodiments are shown by way of example in the drawings and described in detail herein. It should be understood, however, that the exemplary embodiments are not intended to be limited to the particular forms disclosed. On the contrary, the example embodiments are to cover all modifications, equivalents, and alternatives falling within the scope of the present disclosure. Like numbers refer to like elements throughout the description of the figures.

In the description of the present application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

Although the terms "first," "second," etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the present disclosure. As used herein, the term "and/or" includes all any combination of one or more of the relevant listed items.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "coupled," and "joined" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

The terminology used in the present utility model is for the purpose of describing particular embodiments only and is not intended to be limiting. As used in this application, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises," "comprising," "includes," and/or "including," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

In order to solve the problem that the existing vehicle-mounted Doppler radar detector cannot monitor the current health state of a locomotive and a railway along the railway and the roadbed and the long-term change trend of the current health state, the utility model provides the vehicle-mounted Doppler radar detector which comprises a shell and elements inside the shell or called internal elements. The housing is adapted to be mounted to secure and protect its internal components and is adapted to be secured to and move with a rail vehicle along a track. The internal element comprises a Doppler radar emission and reception control main board component and a Doppler radar antenna component; the Doppler radar transmitting and receiving control main board assembly is used for transmitting radar beams to the track through the Doppler radar antenna assembly and receiving radar beam reflection signals to generate radar data, the radar data comprise Doppler characteristic information, and the Doppler characteristic information is used for judging the state of a detection target.

A specific embodiment of the radar detection apparatus for vehicle-mounted doppler radar detection of the present utility model will be described below with reference to fig. 1 and 2, and in the following example, the radar detection apparatus for vehicle-mounted doppler radar detection is implemented as a vehicle-mounted doppler radar detector. Fig. 1 is an overall configuration diagram of an embodiment of the vehicle-mounted doppler radar detector of the present utility model, and fig. 2 is an exploded view of an internal configuration of the embodiment.

As shown in fig. 1, the vehicle-mounted doppler radar detector of this embodiment has a substantially rectangular parallelepiped shape, and the surface of the housing extends beyond the input/output interface. Furthermore, although not shown in fig. 1, the housing is preferably provided with a securing structure that secures itself to other components to facilitate securing to and movement along a track with the rail vehicle.

As shown in fig. 2, it can be seen in an exploded view that the vehicle-mounted doppler radar detector front case 11, doppler radar movement main board assembly 12, doppler radar transmission and reception control main board assembly 13, communication module and I/O interface 14, doppler radar antenna assembly 15, power management module assembly 16, and rear case 17.

The front shell 11 and the rear shell 17 form a shell of the vehicle-mounted Doppler radar detector, and are used for installing, fixing and protecting a Doppler radar movement main board assembly 12, a Doppler radar transmitting and receiving control main board assembly 13, a communication module and I/O interface 14, a Doppler radar antenna assembly 15 and a power management module assembly 16.

The doppler radar movement motherboard assembly 12 of this embodiment includes, but is not limited to, a doppler radar device motherboard, a main control module, a memory module, and the like. In this embodiment, the master control module is implemented by a master chip MTK8878 microprocessor, but the present utility model does not exclude other embodiments of other devices having a digital processing function, for example, it may also be an FPGA, a DSP, or the like. The memory space of the memory module is distributed among the Doppler radar device main board, the main control module, the power management module assembly and the Doppler radar antenna assembly, and supports each functional device to complete the function. The memory module may be, but is not limited to, NAND Flash Memory, memory card or mini-SD/T-Flash/RS-MMC memory with read/write function.

The doppler radar transmission and reception control main board component 13 of this embodiment adopts a single chip scheme, for example, adopts a chip AWR2944 of TI company, and integrates the radar transmission and reception function and the detection function of the millimeter wave radar into one chip. In other embodiments, a single chip may also integrate communication functions. However, the present utility model includes, but is not limited to, a single chip solution, and the radar beam transmitting and receiving functions and the radar data processing functions may be respectively designed in different chips and modules, or multiple single chip combined FMCW transceivers may be used for imaging radar, depending on the specific implementation of the product. For implementing the data processing functions, for example, a digital-to-analog converter (ADC) function, a digital signal processing function, and a security management function may be included. The ADC converts the received signal into a digital signal; the digital signal processing function is typically a Digital Signal Processor (DSP) for, but not limited to, fast fourier transform (Fast Fourier Transform, FFT), log-amplitude, memory compression, etc. operations; the data and equipment safety management function is to generate equipment specific keys of the processing module or the service thereof when necessary, so as to ensure the safety of equipment and data.

The radar transmitting and receiving module comprises a frequency modulation continuous wave radar transceiver (Frequency Modulated Continuous Wave, FMCW), a transceiver integrated feedback control circuit (PLL for short), a transmitter and a receiver. The present embodiment can transmit and receive a coverage of 76GHz to 81GHz, has an available bandwidth of 5GHz, and has multiple receive channels and multiple transmit channels, each with a PCB antenna interface and transmit phase shifter, and also includes a fractional-N PLL based ultra-accurate chirp engine.

The communication module and the I/O interface 14 of this embodiment include a communication module and an I/O interface, where the communication module is responsible for transmitting the radar data and the local operation data collected by the signal processing center to other devices or servers in a wired or wireless manner, and the wireless manner includes, but is not limited to, NFC (near field communication technology), BT (bluetooth), WIFI (wireless network communication technology), UWB, 2G/3G/4G/5G/LTE and other mobile network technologies, FM (modulation communication technology) and the like. Wired systems include, but are not limited to, fiber optic or other communications.

The I/O interfaces include mobile network I/O interfaces, optical communication network I/O interfaces, and other I/O interfaces, and the I/O interfaces of the device include receiving data, transmitting data, and packet forwarding at the network layer, which may support multiple protocols (such as but not limited to TCP/IP, IPX/SPX, appleTalk), and the like.

The doppler radar antenna assembly 15 of this embodiment includes, but is not limited to, an array of four sets of radar transmit antennas and four sets of radar receive antennas. The radar antenna assembly 15 of the present embodiment supports complex DDMA (doppler diversity transmission) waveforms, and combines the detection signal chains of the millimeter wave receiving/transmitting module by simultaneous transmission of multiple antennas of the DDMA, so as to obtain a higher SNR (signal to noise ratio) and a longer detection distance, thereby comprehensively improving the performance of the radar.

The doppler radar antenna assembly 15 of this embodiment includes, but is not limited to, a four-transmit four-receive combination. According to the requirements, the number of the radar receiving and transmitting antennas can be increased or reduced actually, and the number of virtual channels of the radar can be increased through MIMO (multiple input multiple output) technology, so that the angular resolution of the radar is improved.

The doppler radar antenna assembly 15 of this embodiment includes, but is not limited to, an array antenna in which a waveform supporting MIMO radar employs a DDMA waveform, and also includes other high gain array antennas, wide beam array antennas, and the like.

The power management module assembly 16 of this embodiment includes an external power source and a built-in battery, and the external power source port is any one of a DC-Jack mechanical structure or a USB/Micro USB/USB Type C mechanical structure. The built-in battery is responsible for providing uninterrupted power supply in the state that the device is not connected with an external power line or has power failure in the using process.

The doppler radar movement main board assembly 12, the doppler radar transmission/reception control main board assembly 13, the communication module, and the I/O interface 14 of this embodiment may be integrated into one main board assembly, or may be separated into a plurality of main board assemblies.

As a preferred embodiment, the doppler radar transmitting and receiving control main board assembly 13 further comprises inertial navigation sensors for detecting real-time position information of the radar detection device relative to the rail, which is used for real-time calibration of the radar data by the signal processing sub-module. For example, the deviation of locomotive vibration can be corrected in real time through inertial navigation sensor data, and particularly can be calibrated with CP III calibration beside a rail within a certain distance. CP III is a foundation pile control network, a three-dimensional control network laid along a line, a plane control is started and stopped on a foundation plane control network (CP i) or a line control network (CP ii), and a elevation control is started and stopped on a second level network laid along the line, and is generally tested after the on-line lower engineering construction is completed, and is a benchmark for ballastless track laying, operation and maintenance.

The vehicle-mounted doppler radar detector according to an embodiment of the present utility model may constitute a vehicle-mounted doppler radar detector array, and thus the antenna module is a MIMO antenna module that increases the number of virtual channels of the radar through MIMO (multiple input multiple output) technology, thereby improving the angular resolution of the radar. The basic concept of MIMO radar, for a system comprisingNTxThe root of the transmitting antenna is used to transmit,NRxradar system with a receiving antenna, which can be formed by appropriate antenna layout and wave designNTx×NRxTo increase the number of (virtual) antennas and thereby improve the angular resolution. The present embodiment uses a waveform design technique of MIMO radar. Briefly, to form a virtual antenna array, the transmitting end must be capable of transmitting a signal in one dimensionNTxThe waveforms of the root transmit antennas are multiplexed, and the receiver must be able to multiplex the waveforms in the same dimension after receiving themNTxThe waveforms of the root transmit antennas are separated. According to the choice of the multiplexing/demultiplexing dimension in the waveform design, the waveform of the MIMO radar of the present embodiment adopts DDMA (Doppler dimension multiple access), all transmitting antennas transmit simultaneously under the DDMA waveform, but the signal of each transmitting antenna is offset by a specific frequency, and the signal is artificially offset by the human bodyThe shifted frequencies enable the signals of the different transmit antennas to be separated in the Doppler domain. Under the DDMA waveform, the speed value detected in the echo formed by one target under the irradiation of signals of different transmitting antennas is different, and by using the speed difference, the signals of different transmitting antennas can be separated from one target at the receiving end.

The doppler radar antenna assembly 15 includes, but is not limited to, an array antenna in a waveform that supports MIMO radar using DDMA waveforms, and may be implemented by other high gain array antennas, wide beam array antennas, and the like.

In addition, the radar detection device supports data extraction in two states of independent work connection networking and non-networking. In the non-networking state, the doppler radar device may implement data exchange by, but not limited to, NFC (near field communication technology), BT (bluetooth), infrared, WIFI (wireless network communication technology), UWB, and the like. In the networking state, the data exchange is realized by supporting, but not limited to, mobile networks such as 2G/3G/4G/5G/LTE and the like or other connection Internet modes. The communication module 107 may include optical communication. The optical communication may be a fiber optic data transmission module. More specifically, the optical communication module can be a two-in two-out optical fiber data transmission module, so as to realize the function of a self-healing ring network.

Figure 3 shows a cross-sectional view of the vehicle-mounted doppler radar detector array of the present utility model mounted at the bottom of a train above a rail. In this embodiment, a row of 7 vehicle-mounted doppler radar detectors U11, U12, …, U17 are installed at the bottom of the train. The distance of each detector relative to the rail is fixed (the deviation of the locomotive vibrations has been corrected in real time by inertial sensor data). When the vehicle-mounted Doppler radar detector runs along with the train at a high speed from the upper side of the rail, the rapid change of the crosstie C1, the rail C2, the fastener component C3 and the like relative to the radar radial depth information can be detected according to the Doppler rapid change of each reflected wave beam, and corresponding Doppler characteristic information is generated and acquired.

Fig. 4 is a schematic diagram of a failure of the iron track nut to loosen causing rotation of the track buckle in an embodiment of the vehicle-mounted doppler radar detector of the present utility model. As can be seen with reference to fig. 4, when the fastener C3 is abnormal, different doppler characteristic information is fed back, so as to position the abnormal state of the fastener.

Besides the fault of whether the fixed structural member at the fixed position on the track is displaced or not, which is shown in fig. 4, the fault can be also judged whether the structural member is missing or not, and partial information of the detected foreign matter related substances, such as the nature, the size and the like, can be obtained.

The vehicle-mounted Doppler radar detector provided by the embodiment of the utility model can be used alone or a plurality of devices can be combined to be used as a system, for example, in practical application, the design of parallel installation of two rows of radar detector arrays as shown in fig. 5 can be adopted, the measurement redundancy is increased, and the measurement accuracy is improved. Meanwhile, in order to facilitate data processing, a host (a state analysis device) can be arranged in the train to interact with the radar detection device (the vehicle-mounted Doppler radar detector) in real time, or a cloud server is used for processing the data.

Although the present utility model has been described above with reference to the exemplary embodiments and the accompanying drawings, it should be apparent to those of ordinary skill in the art that various modifications can be made to the above-described embodiments without departing from the spirit and scope of the claims.

Claims (10)

1. A vehicle Doppler radar detector comprises a housing for mounting, fixing and protecting the internal components, characterized in that,

the housing is securable to and movable with a rail vehicle along a track;

the internal components comprise a Doppler radar emission and reception control main board assembly (13) and a Doppler radar antenna assembly (15);

the Doppler radar transmitting and receiving control main board assembly (13) is used for transmitting radar beams to the track through the Doppler radar antenna assembly (15) and receiving radar beam reflection signals to generate radar data, and the radar data comprise Doppler characteristic information which is used for judging the state of a detection target.

2. The vehicle-mounted doppler radar detector according to claim 1, characterized in that the doppler radar transmission/reception control motherboard assembly (13) comprises a radar detection chip integrated with radar beam transmission and reception functions and radar data processing functions.

3. The vehicle-mounted doppler radar detector according to claim 1, wherein the doppler radar transmission/reception control motherboard assembly (13) includes a radar transceiver having radar beam transmission and reception functions and a data processor having radar data processing functions.

4. The vehicle doppler radar detector of claim 1, wherein the internal components further comprise a doppler radar core motherboard assembly (12), the doppler radar core motherboard assembly (12) comprising a master control chip for controlling the operation of the other internal components.

5. The vehicle-mounted doppler radar detector of claim 4, wherein the master control chip is further configured to process the radar data to generate local operational data.

6. The vehicle doppler radar detector of claim 5, characterized in that the doppler radar core motherboard assembly (12) further comprises a memory for storing the radar data and/or the local arithmetic data.

7. The vehicle doppler radar detector of claim 5, wherein the internal components further comprise a communication module and I/O interface (14) for transmitting radar data and local operational data to other devices or servers by wired or wireless means.

8. The vehicle doppler radar detector of any one of claims 1 to 7, wherein the internal components further comprise a power management module assembly (16) for providing electrical power to other internal components.

9. The vehicle doppler radar detector of any one of claims 1 to 7, wherein the doppler radar antenna assembly comprises an array antenna in DDMA waveforms supporting MIMO radar waveforms.

10. A vehicle-mounted doppler radar detector array, characterized by: a plurality of vehicle-mounted doppler radar detectors mounted on the same railway vehicle, wherein the vehicle-mounted doppler radar detectors are as described in claim 9.

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