CN110796759B - Public safety site-oriented vehicle-mounted dynamic monitoring system and monitoring method - Google Patents
Public safety site-oriented vehicle-mounted dynamic monitoring system and monitoring method Download PDFInfo
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Abstract
The invention provides a vehicle-mounted dynamic monitoring system and a monitoring method for a public safety site. The invention realizes the monitoring and recording of the vehicle driving process by storing the high-definition video data obtained by the image acquisition equipment into the high-speed storage unit through the mSATA interface after decoding and compressing. The invention can also connect the vehicle-mounted terminal to a background data processing center in cooperation with a 4G communication module, and the background data processing center processes the acquired flammable and combustible detection data, vehicle-mounted electronic information, command commands, positioning data, navigation data and video monitoring signals in real time to generate corresponding command data, wherein the command data comprises video monitoring signals, emergency stop signals, one-key window breaking signals or contact vehicle interception signals and the like to the vehicle-mounted terminal, so that the remote monitoring of the vehicle running state is realized.
Description
Technical Field
The invention relates to the field of urban traffic safety equipment, in particular to a vehicle on-site monitoring system and a monitoring method.
Background
In order to ensure the running safety of urban traffic, public transport and road passenger transport vehicles need to be monitored. The vehicle-mounted terminal is a front-end device of a vehicle monitoring and management system, and can also be called a vehicle dispatching and monitoring terminal (TCU terminal).
At present, a road transportation and management department obtains specific position information of a running vehicle by using GPS positioning data uploaded by a vehicle-mounted terminal installed on a vehicle body, analyzes the position information of the vehicle to obtain a running speed of the vehicle, and judges whether the vehicle is running normally by comparing the running speed of the vehicle with a limited vehicle speed range of a running road.
However, since various vehicles have different transportation conditions and different transportation requirements for carrying goods, different vehicles need to be managed and instructed in a targeted manner according to different monitoring requirements. In consideration of the complex road conditions and the special conditions, such as the terrorist attack situations of explosion, fire, collision and the like, special protection measures need to be set, and effective monitoring and management of vehicles can still be ensured under the special emergency conditions.
Disclosure of Invention
The invention provides a vehicle-mounted dynamic monitoring system and a monitoring method for a public safety site, aiming at the defects of the prior art, and the vehicle-mounted dynamic monitoring system and the monitoring method can still ensure the monitoring of a vehicle site under a special emergency condition, effectively transmit and record vehicle operation data and carry out specificity. The invention specifically adopts the following technical scheme.
Public safety scene oriented vehicle-mounted dynamic monitoring system, it includes a plurality of vehicle terminals, still includes: the backstage data processing center is connected with a plurality of vehicle-mounted terminals arranged on different vehicles through a 4G network, and is used for: and respectively receiving the flammable and explosive detection data, the vehicle-mounted electronic information, the command, the positioning data, the navigation data and the video monitoring signals reported by each vehicle-mounted terminal in real time, respectively monitoring whether the signals meet the set requirements according to the conditions of each vehicle, and issuing command data to the corresponding vehicle-mounted terminal when the signals do not meet the set requirements. Each vehicle-mounted terminal in the vehicle on-site monitoring system is also respectively connected with: the system comprises image acquisition equipment, a vehicle-mounted terminal and a video processing device, wherein the image acquisition equipment is arranged on a vehicle, is connected with a high-definition video input interface of the vehicle-mounted terminal arranged on the vehicle and is used for acquiring high-definition video data and outputting the high-definition video data to the vehicle-mounted terminal; the device comprises a vehicle-mounted terminal, an inflammable and explosive detection device and an inflammable and explosive detection device, wherein the inflammable and explosive detection device is arranged on the vehicle, is connected with an inflammable and explosive detection input interface of the vehicle-mounted terminal arranged on the vehicle, and is used for monitoring the states of inflammable volatile matters and explosives in real time, collecting inflammable and explosive detection data in real time and reporting the inflammable and explosive detection data to the vehicle-mounted terminal; and the positioning navigation unit is arranged on the vehicle, is connected with a positioning navigation data input interface of a vehicle-mounted terminal arranged on the vehicle, and is used for carrying out GPS positioning and outputting the obtained positioning data and corresponding navigation data to the vehicle-mounted terminal.
Optionally, in the vehicle on-site monitoring system, the central processing unit is an FPGA chip or an ASIC chip, and includes: the UART interface is used for realizing CAN bus interface conversion and RS485 interface conversion; the CAN interface comprises 2 paths with a Baud rate of 250Kbps, wherein one path is connected with a vehicle-mounted electronic information input interface, a flammable and explosive detection input interface and a positioning navigation data input interface and is used for transmitting vehicle-mounted electronic information, flammable and explosive detection data, positioning data and corresponding navigation data, and the other path is used as a spare for transmitting the vehicle-mounted electronic information, the flammable and explosive detection data, the positioning data and the corresponding navigation data when the CAN interface at one path is abnormal; the RS485 interface is connected with the video decoding module and/or the image recognition unit and used as a standby interface for transmitting the high-definition video data when other interfaces connected with the video decoding module and/or the image recognition unit are abnormal.
Optionally, in the vehicle on-site monitoring system, each of the vehicle-mounted terminals is further connected to a power supply unit and two +24V input power supplies respectively; the power supply unit is used for filtering and converting the +24V input power supply, and switching to another +24V input power supply for supplying power when detecting that the voltage of any +24V input power supply is lower than a threshold value; each +24V input power supply is provided with a rectifier diode at an input interface thereof respectively to prevent the power supply from being reversely connected, and each +24V input power supply is also provided with a voltage stabilizing, voltage reducing and protecting circuit respectively to protect the power supply to stabilize power supply output.
A vehicle on-site monitoring method is used for any vehicle on-site monitoring system, and each vehicle-mounted terminal comprises the following steps: the method comprises the following steps that firstly, the central processing unit starts loading, a parallel guide mode is selected, a plug-in NAND FLASH is selected, and a 4-channel mSATA interface, an 8-channel high-definition SDI input interface, a 4G communication module and a MiniPCE interface thereof are started from off-chip loading; secondly, initializing configuration of the central processing unit by adopting a Linux operating system, and initializing a video decoding module, an image recognition unit and a high-speed storage unit according to an external initialization function; thirdly, providing independent operation function interfaces for driving programs corresponding to the 4G communication module, the image acquisition equipment, the flammable and combustible detection equipment and the positioning navigation unit; fourthly, the video decoding module decodes the high-definition video data received by the high-definition video input interface; the image recognition unit receives the decoded high-definition video data output by the video decoding module, then carries out face recognition and action behavior recognition according to the decoded high-definition video data, outputs user information corresponding to a face according to the result of the face recognition, and outputs command data corresponding to the action according to the result of the action behavior recognition; the central processing unit performs video compression on the decoded high-definition video data and outputs the compressed video data to a high-speed storage unit; the central processing unit is also communicated with a background data processing center through the 4G communication module correspondingly according to the inflammable and explosive detection data, the vehicle-mounted electronic information, the command, the positioning data and the navigation data; the high-speed storage unit receives compressed video data output after the video compression in the central processing unit and respectively stores the corresponding compressed video data; fifthly, the 4G communication module reports the inflammable and explosive detection data, the vehicle-mounted electronic information, the command, the positioning data, the navigation data and the video monitoring signal to a background data processing center in real time and receives command data sent by the background data processing center; sixthly, outputting corresponding command data according to the flammable and explosive detection data, the vehicle-mounted electronic information, the command, the positioning data, the navigation data and the video monitoring signal which are reported by the background data processing center in real time aiming at each vehicle-mounted terminal, wherein the command data is issued: video monitoring signals, emergency forced stop signals, one-touch window breaking signals or contact type vehicle intercepting signals.
Optionally, in the vehicle on-site monitoring method, in the monitoring process, if it is monitored that the voltage of any +24V input power supply is lower than the threshold, the power supply unit switches the output signal of the power supply unit to another +24V input power supply to supply power.
Advantageous effects
The invention realizes the monitoring and recording of the vehicle driving process by storing the high-definition video data obtained by the image acquisition equipment into the high-speed storage unit through the mSATA interface after decoding and compressing. The invention can also connect the vehicle-mounted terminal to a background data processing center in cooperation with a 4G communication module, and the background data processing center processes the acquired flammable and combustible detection data, vehicle-mounted electronic information, command commands, positioning data, navigation data and video monitoring signals in real time to generate corresponding command data, wherein the command data comprises video monitoring signals, emergency stop signals, one-key window breaking signals or contact vehicle interception signals and the like to the vehicle-mounted terminal, so that the remote monitoring of the vehicle running state is realized.
In order to ensure the stability of the system operation, the invention further connects the power supply unit to the two groups of input power supplies simultaneously to realize the power supply of the vehicle-mounted terminal. The power supply unit is designed with a switching mechanism of power supply abnormality for ensuring stable power supply of the terminal, and power supply switching is carried out when the abnormal voltage of any power supply is lower than a threshold value, so that stable power supply of the terminal is ensured. Meanwhile, in order to avoid the influence of power supply fluctuation on the system operation and the accuracy of the operation of the central processing unit, the invention is further designed with a voltage stabilizing, voltage reducing and protecting circuit to ensure the stability of the power supply.
In order to ensure the stability of various data transmission, the high-definition video input interface is set as a parallel 8-channel high-definition SDI input interface, a standard disk with 4 channels of mSATA interfaces is selected as a high-speed storage unit, a CAN interface is set as 2 channels, and a video decoding module and/or an image recognition unit are designed to be capable of transmitting through an RS485 interface and an RS232 communication interface. Therefore, through the redundancy design, the invention can carry out quick switching when any part of the system is abnormal, ensures that the whole operation of the system is not influenced, and improves the anti-interference capability of the system.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of the system components of the vehicle-mounted terminal of the present invention;
FIG. 2 is a schematic diagram of an interface design of the in-vehicle terminal of the present invention;
fig. 3 is a schematic diagram of the operation principle of the in-vehicle terminal of the present invention.
Detailed Description
In order to make the purpose and technical solution of the embodiments of the present invention clearer, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Fig. 1 is a vehicle-mounted terminal according to the present invention, which includes:
the high-definition video input interface is used for connecting and receiving high-definition video data acquired by image acquisition equipment such as an SDI (Serial digital interface) camera; the interface comprises 8 paths of high-definition SDI video input, an SDI equalizer is adopted for image equalization enhancement and then is merged into a video decoder GS2971 at the rear end, and decoder communication can be controlled to be carried out through an SPI port of an FPGA;
the combustible and explosive detection input interface is used for connecting combustible and explosive detection equipment and receiving combustible and explosive detection data;
the vehicle-mounted electronic information input interface is used for connecting a vehicle bus and acquiring vehicle-mounted electronic information;
the command input interface is used for receiving command commands;
the positioning navigation data input interface is used for connecting and receiving positioning data and navigation data acquired by the positioning navigation unit;
the video decoding module is connected with the high-definition video input interface and is used for decoding the high-definition video data received by the high-definition video input interface;
the image recognition unit comprises an image face recognition module and an image action behavior recognition module, receives the decoded high-definition video data output by the video decoding module, is respectively used for carrying out face recognition and action behavior recognition according to the decoded high-definition video data, outputs user information corresponding to a face according to the result of the face recognition, and outputs command data corresponding to the action according to the result of the action behavior recognition;
the central processing unit is used for receiving the command input by the command input interface, receiving positioning data and navigation data obtained by the positioning navigation data input interface, receiving user information and corresponding command data obtained by the image recognition unit, receiving decoded high-definition video data output by the video decoding module, performing video compression on the decoded high-definition video data, and outputting the compressed video data to the high-speed storage unit; the central processing unit is also communicated with a background data processing center correspondingly according to the inflammable and explosive detection data, the vehicle-mounted electronic information, the command, the positioning data and the navigation data, and outputs a video monitoring signal, an emergency forced stop signal, a one-key window breaking signal or a contact type vehicle interception signal; the processor and the FPGA can be directly interconnected through 8 BT656 video synchronous parallel interfaces and an auxiliary communication interface SPI and a serial port;
and the high-speed storage unit is connected with the central processing unit, receives the compressed video data output after the video compression in the central processing unit and respectively stores the corresponding compressed video data. The storage can be carried out by adopting a standard disk with a mSATA interface, and the capacity is4 ports and 2TB capacity of a single port.
Referring to fig. 2, the vehicle-mounted terminal is further connected to a background processing center through a 4G communication module to form a vehicle field monitoring system. The system comprises: a plurality of in-vehicle terminals as described in any above, further comprising:
the backstage data processing center is connected with a plurality of vehicle-mounted terminals arranged on different vehicles through a 4G network, and is used for: respectively receiving flammable and explosive detection data, vehicle-mounted electronic information, command commands, positioning data, navigation data and video monitoring signals reported by each vehicle-mounted terminal in real time, respectively monitoring whether the signals meet set requirements according to the conditions of each vehicle, and issuing command data to the corresponding vehicle-mounted terminal when the signals do not meet the set requirements;
each vehicle-mounted terminal in the vehicle on-site monitoring system is also respectively connected with:
the system comprises image acquisition equipment, a vehicle-mounted terminal and a video processing device, wherein the image acquisition equipment is arranged on a vehicle, is connected with a high-definition video input interface of the vehicle-mounted terminal arranged on the vehicle and is used for acquiring high-definition video data and outputting the high-definition video data to the vehicle-mounted terminal;
the device comprises a vehicle-mounted terminal, an inflammable and explosive detection device and an inflammable and explosive detection device, wherein the inflammable and explosive detection device is arranged on the vehicle, is connected with an inflammable and explosive detection input interface of the vehicle-mounted terminal arranged on the vehicle, and is used for monitoring the states of inflammable volatile matters and explosives in real time, collecting inflammable and explosive detection data in real time and reporting the inflammable and explosive detection data to the vehicle-mounted terminal;
and the positioning navigation unit is arranged on the vehicle, is connected with a positioning navigation data input interface of a vehicle-mounted terminal arranged on the vehicle, and is used for carrying out GPS positioning and outputting the obtained positioning data and corresponding navigation data to the vehicle-mounted terminal.
Each terminal under the system works in the following way:
the method comprises the following steps that firstly, the central processing unit starts loading, a parallel guide mode is selected, a plug-in NAND FLASH is selected, and a 4-channel mSATA interface, an 8-channel high-definition SDI input interface, a 4G communication module and a MiniPCE interface thereof are started from off-chip loading;
secondly, initializing configuration of the central processing unit by adopting a Linux operating system, and initializing a video decoding module, an image recognition unit and a high-speed storage unit according to an external initialization function;
thirdly, providing independent operation function interfaces for driving programs corresponding to the 4G communication module, the image acquisition equipment, the flammable and combustible detection equipment and the positioning navigation unit;
fourthly, the video decoding module decodes the high-definition video data received by the high-definition video input interface; the image recognition unit receives the decoded high-definition video data output by the video decoding module, then carries out face recognition and action behavior recognition according to the decoded high-definition video data, outputs user information corresponding to a face according to the result of the face recognition, and outputs command data corresponding to the action according to the result of the action behavior recognition; the central processing unit performs video compression on the decoded high-definition video data and outputs the compressed video data to a high-speed storage unit; the central processing unit is also communicated with a background data processing center through the 4G communication module correspondingly according to the inflammable and explosive detection data, the vehicle-mounted electronic information, the command, the positioning data and the navigation data; the high-speed storage unit receives compressed video data output after the video compression in the central processing unit and respectively stores the corresponding compressed video data;
fifthly, the 4G communication module reports the inflammable and explosive detection data, the vehicle-mounted electronic information, the command, the positioning data, the navigation data and the video monitoring signal to a background data processing center in real time and receives command data sent by the background data processing center;
sixthly, outputting corresponding command data according to the flammable and explosive detection data, the vehicle-mounted electronic information, the command, the positioning data, the navigation data and the video monitoring signal which are reported by the background data processing center in real time aiming at each vehicle-mounted terminal, wherein the command data is issued: video monitoring signals, emergency forced stop signals, one-touch window breaking signals or contact type vehicle intercepting signals.
Therefore, the system can monitor the vehicle state in real time, correspondingly control the vehicle and effectively store and synchronize the vehicle running data.
Each module of each vehicle-mounted terminal under the system is designed according to the following mode:
data access and standardization module: the real-time access of detection data such as vehicle-mounted inflammable volatile matters, explosives, navigation positioning and the like is mainly realized; the system supports 8-channel high-definition video input interfaces;
the video processing and analyzing module: the video compression control main board is mainly realized by a video decoding module and an image recognition unit. The system is used as a data processing and control core of a vehicle-mounted terminal in the system, and supports intelligent analysis of vehicle-mounted video images and early warning of abnormal behaviors; the method comprises the following steps: firstly, video input processing is carried out, and video data decoding is mainly completed; secondly, video compression processing is carried out, video H264 compression is completed, and the storage space is saved in the compression purpose; and thirdly, storing the video data, and finishing shunt storage of the video data. In one mode, the module can be realized by a data operation circuit unit, an image compression circuit unit, an image storage circuit unit, a clock circuit unit, an interrupt management circuit unit and a logic control circuit unit which take a Haisi processor and an FPGA processor as cores;
a mass storage module: local storage of detection data such as pictures, inflammable volatile matters, explosives, navigation positioning and the like is supported; the local storage time of detection data of vehicle-mounted videos, pictures, inflammable volatile matters, explosives, navigation positioning and the like is more than or equal to 48 hours; the storage capacity of the hard disk is more than or equal to 8 TB; the hard disk has an anti-seismic function, and an industrial solid-state disk is used as storage equipment; the storage channel is more than or equal to 2; the local storage time for storing detection data such as vehicle-mounted audio and video, pictures, XX volatile matters and explosives, navigation and positioning and the like is more than or equal to 48 hours;
a wireless communication module: the system is used for interaction between data and a platform, and supports real-time transmission and retrieval of video images, and real-time transmission of early warning information such as abnormal behaviors, inflammable volatile matters and explosives, navigation positioning and abnormal tracks and vehicle remote control instructions;
an emergency communication module: the real-time transmission of early warning information such as abnormal behaviors, inflammable volatile matters, explosives, navigation positioning, abnormal tracks and the like is supported under the conditions of abnormal or interrupted wireless communication and the like;
vehicle remote speed limiting and forced stopping: based on a wireless access vehicle speed limit or forced stop instruction, transmitting a control instruction to a vehicle speed control unit through a vehicle CAN bus to realize vehicle speed limit or forced stop;
the emergency power supply module: the power supply unit is mainly used for filtering, converting and managing two paths of +24V input power supplies (including 1 path of standby power supply), providing working power supplies for other equipment and the equipment, and being capable of detecting that the power supply is automatically switched to the standby power supply of the system when an external system is powered off. The emergency power supply under the condition that a vehicle-mounted power supply system is damaged due to typical terrorist attack events such as fire and explosion or other types of events is supported, a protection device is arranged in the emergency power supply, the damage to a host machine caused by overvoltage, overcurrent, short circuit, reverse connection of a positive electrode and a negative electrode of a power supply and the like is prevented, normal operation of vehicle-mounted terminal equipment can be ensured, and key data of an incident time period can be effectively acquired; the principle of the power supply unit for switching between power supplies is as follows: detecting whether the system power supply voltage is lower than a certain threshold value by adopting a voltage monitoring chip, starting a switching control circuit to switch a system power supply to a standby power supply when the system power supply voltage is lower than the set threshold value, and recovering the system power supply when the system power supply voltage is higher than the set threshold value;
safety protection: through scientific hardware design, structural optimization and material selection, the vibration resistance, impact resistance, high temperature resistance and other performances of the equipment are ensured through external protection of the equipment, and an industrial solid disk can be used as a storage device. And under the terrorist attack conditions of explosion, fire, collision and the like, the stability and reliability of data storage are ensured.
In addition, for guaranteeing that vehicle terminal is reliable and stable under the special environment, still need it can be shock-resistant, striking: the data of a hard disk which falls when the hard disk is subjected to shock waves of 1 kilogram of TNT explosive within a range of 3 meters and is not less than 3 meters high can be read; high temperature resistance: placing the mixture in an environment below 1100 ℃ for 10 minutes, wherein the internal temperature is lower than 50 ℃; the method comprises the steps of providing a video output interface for local monitoring; the system is provided with a DDR interface, and the data exchange and the program operation caching of the system are completed; the vehicle-mounted electronic information transmission system is provided with a CAN interface and is used for vehicle-mounted data acquisition and control instruction transmission to complete vehicle electronic information transmission; the video playback function is provided; the working voltage range is as follows: 18V to 32V; the host is internally provided with a protection device to prevent the host from being damaged by overvoltage, overcurrent, short circuit, reverse connection of the positive electrode and the negative electrode of a power supply and the like; the rated working current is guaranteed to be within 3A.
In order to meet the requirements and ensure the normal and stable operation of the system, the invention also adopts the following measures to ensure the stable operation of the system:
1. environmental adaptive measures
In order to meet the requirements of rain, salt fog, mould, humidity and the like, anodizing the structural member and performing three-proofing treatment on the circuit board;
the design selection of the components is carried out by preferentially selecting industrial-grade components;
in order to meet the requirements of use temperature, storage temperature and low air pressure, the working temperature range is-20 ℃ to +70 ℃, and the storage temperature range is-40 ℃ to +85 ℃. For devices without corresponding military grade, selecting design from industrial grade chips with the working temperature range of-40 ℃ to +85 ℃, and screening the whole machine in an environmental stress test;
in order to meet the requirement of storage life, the components are selected according to the storage life not less than 15 years;
in order to meet the reliability index, design criteria such as redundancy design and the like are adopted for important input and output signals, and derating design, tolerance design, simplified design and the like are adopted for the whole circuit design;
in order to meet the requirements of impact, acceleration and shock resistance, fixing measures of components with larger mass are made in modes of glue dispensing and the like during production of the circuit board;
2. reliability design measure
The proportion of the new technology is controlled to be not more than 20 percent, mature technologies and processes with similar models are greatly used for reference, and the risk is reduced to the lowest;
design work such as environmental adaptability, testability, comprehensive guarantee and the like is well done to serve reliability;
designing and reviewing circuits, structures, software, hardware, processes and the like;
analyzing, confirming and screening fault modes of all components;
and carrying out tests such as high-low temperature, vibration, electromagnetic compatibility and the like on the single board and the whole machine, and modifying and perfecting the design according to the test result.
3. Maintainability design measures
A serial port program loading function is designed, so that the technical state management of products and the upgrading and maintenance of control software are facilitated;
developing an automatic product test bench;
collecting fault devices, fault modes and repair measures of products, and rechecking and confirming the maintainability model of the products;
rechecking and reviewing the technical specification, the design drawing and the prototype of the product;
design related training is performed on testing and maintenance personnel.
4. Design measure for testability
The method comprises the following steps of specially developing a board-level automatic test board, and specially testing functions, interfaces and various performance indexes of an intelligent vehicle-mounted terminal system;
adding test points of a power supply and an analog quantity acquisition circuit in the circuit design;
the PCB design makes the space layout more convenient for the instrument test;
evaluating the testability design of software and hardware;
collecting test data, and analyzing the distribution rule of the test data so as to find out defects of the design and the device.
5. Design measure for security
Comprehensively inspecting suppliers of components and raw materials, wherein the suppliers of important components are not less than two, so as to ensure quality and sustainable supply capability;
an automatic test bench is developed and relevant evaluation, identification and verification are carried out, so that the product testing and maintaining capability is improved;
the used instruments and equipment are checked and calibrated according to the regulations so as to ensure the effectiveness;
modifying, reviewing and perfecting process files for debugging, aging and the like for production and other design documents;
establishing BGA repair workstations, X-ray machines and other equipment, and arranging special training to improve welding, detection and maintenance capabilities;
and designing related training is carried out on testing and maintenance personnel so as to improve professional technical skills and the like.
6. Safety design measure
6.1 redundancy design
The functions influencing the task should be designed redundantly; safety-critical functions cannot be realized solely by means of control software, such as switching value interface control, and safety design is carried out together with hardware circuits.
6.2 simplified design
On the basis of function analysis, the proportion of the new technology is controlled, and a mature technology is selected; mature functional modules are preferably selected for software functional design, so that the reusability of software is improved; unnecessary system hardware or software redundancy is avoided, and the complexity of the system is reduced; the specifications, varieties, quantity and the like of components, parts and the like are reduced as much as possible, and the complexity is reduced to the minimum degree.
6.3 software design
The safety of the control software is designed according to the software reliability and safety design criteria of GJB/Z102-1997; the safety of the control software is analyzed and evaluated according to GJB/Z142-2004 military software safety analysis guide.
6.4 Security verification
Aiming at fault sources which can cause safety problems, a plurality of system fault tolerance and safety detection items are specially designed in a detection system, and the safety design of hardware and software is specially tested and verified.
7. Electromagnetic compatibility design measures (when applicable)
7.1 design of scheme
The device is selected according to the principles of low working frequency, high integration level, narrow bandwidth, low power consumption and surface mounting, and is arranged according to the principles of convenient filtering, convenient shielding and anti-interference.
7.2 principle design
And carrying out electromagnetic protection design according to the performance of the vehicle-mounted power supply electrical appliance. The interface circuit needs the necessary anti-surge, anti-vehicle ignition interference, anti-lightning, anti-static and filtering protection devices; the circuit has the performance of resisting reverse polarity of a power supply, the performance of resisting overvoltage of the power supply, the power-off protection performance and the low-voltage protection performance.
A high-speed signal series resistor; the connection relation between a large current ground, a small current ground, an analog ground, a digital ground, a direct current ground, an alternating current ground and the like is well isolated and processed by adopting a single-point common ground mode;
the filtering design of a power supply circuit is well made, and isolation and filtering should be made between different groups of power supplies such as an analog power supply and a digital power supply.
7.3 Cable design
Power lines and signal lines are arranged on different connector pins according to functional partitions; the important differential wires and the serial port transmitting and receiving wires are twisted together as much as possible to shield as much as possible; the power lines and the ground lines are multiple as much as possible, and the number of the ground lines is not less than that of the corresponding power lines.
7.4PCB design
For elements with stronger radiation electromagnetic field and elements with more sensitive electromagnetic induction, the distance between the elements should be increased or shielded, and the direction of placing the elements should be crossed with the adjacent printed wires; the device with high and low voltage is prevented from being mixed with each other and the devices with strong and weak signals are prevented from being staggered together as much as possible; for components which can generate magnetic fields, such as transformers, speakers, inductors and the like, attention should be paid to reducing the cutting of magnetic lines to printed conductors during layout, and the magnetic field directions of adjacent components should be perpendicular to each other to reduce the coupling between the adjacent components.
In the system, 2 schemes can be selected for a main control circuit of the vehicle-mounted terminal, one scheme is a scheme for realizing functions based on an FPGA, and the other scheme is an existing scheme based on a third party chip manufacturer.
The two protocols are compared as follows:
1) based on FPGA is flexible, the customizable degree is high (on the premise that the existing third-party chip cannot complete the required function), but the purchase cost is high and the research and development period is long.
2) An ASIC chip that can satisfy the existing demand function by a third party vendor is sought. The ASIC is characterized by facing the requirements of specific users, and compared with a general integrated circuit, the ASIC has the advantages of smaller volume, lower power consumption, improved reliability, improved performance, enhanced confidentiality, reduced cost and the like during batch production. Meanwhile, the development period is short, and the cost is low.
3) It is a relatively economical solution to be able to find a suitable ASIC chip to perform the required functions. The method has advantages in reliability, research and development cost, development period, power consumption and the like.
In any way, referring to the interface design of fig. 2, the vehicle-mounted terminal has: 8 video input interfaces; video data storage based on SATA3 interface solid state disk device and interface; 1 path of video monitoring output interface; the 1-path Ethernet data transmission interface is used for selecting one of the interfaces of the wireless communication module; the UART interface is used for finishing CAN bus interface conversion and RS485 interface conversion; the flash memory interface is used for completing partial saving and partial data caching of the controller program; and the DDR interface is used for finishing DDR loading to finish data caching and is used as a memory carrier for running a program. The interface units are coordination and conversion units for interaction between the computer kernel and external information, and can realize signal conditioning, interface conversion, power driving, environment isolation and the like between the video compression control panel kernel and external equipment.
The system interface is designed by a 2-layer bus, wherein I2C, SRAM, ROM, UART, GPIO and IR are low-speed interface parts. IR is the red wire transceiver interface, as an option in the scheme. Whether the design is carried out or not is determined according to the requirements of users. The DMAC is a DMA controller for data handling. The UART is a serial port communication interface for debugging and accepting user command input. And simultaneously, the conversion of the CAN bus interface is completed. The ROM is used for storing a ROM program and is used for moving a main program and the minimum drive required in a starting program when the controller is started. The SRAM is used for storing the main program. The DDR controller is used to drive peripheral DDR particles. The SATA controller drives a storage terminal using SATA as an interface, such as a peripheral SATA or HDD. The USB host is used as a USB master for externally connecting the USB storage device. The GMA controller is used to drive the network interface. The NAND controller is used to drive a peripheral NAND flash, in which NAND FLASH stores the main program. And the SFC is used for driving a storage medium NOR FLASH or NAND FLASH of a peripheral belt SPI interface, wherein NOR FLASH or NAND FLASH is used for storing a main program. In the implementation of the scheme, the storing main program can select a NAND controller or an SPI NOR Flash (SPI NAND Flash). Video input is used for camera data input. HDMI output can be used for video data output. The CVBS functions as an HDMI output. The ARM process system is used as a core processing unit of the controller and is based on ARM11 or A9. The Video codec serves as a compression processing unit of H264. The AES is used as an encryption unit processing module and can be selected according to user requirements. Encryption of the NAND write data is mainly done.
The CAN communication device is used for 2-path CAN communication of a central processing unit formed by an FPGA chip or an ASIC chip, and the CAN interface is expanded through the single chip microcomputer STM32F427IGH6 because the Haisi processor does not support CAN communication.
The terminal mainly comprises a video compression control mainboard, a mSATA disk and a 4G module. The 4G module adopts a full-network communication 4G communication module of Guangzhou remote communication EC20_ CEFAG, the interface is MiniPCIE, and the inside of the module communicates with a serial port through a USB 2.0. The video compression control main board is a data processing and control core and mainly comprises a data operation, image compression, storage, clock, interrupt management and logic control circuit unit which takes a Haesi processor and an FPGA processor as cores. The power supply unit is mainly used for filtering, converting and managing two paths of +24V input power supplies (including 1 path of standby power supply), providing working power supplies for other equipment and the power supply unit, and being capable of detecting that the power supply is automatically switched to the standby power supply of the system when an external system is powered off. The interface unit is a coordination and conversion unit for interaction between the computer kernel and external information, and is mainly used for finishing signal conditioning, interface conversion, power driving, environment isolation and the like between the video compression control panel kernel and external equipment.
The terminal is characterized in that 3 paths of serial ports in the terminal are communicated through a UART port of a processor, wherein 1 path of serial port is communicated with an FPGA (field programmable gate array) and used for register configuration and the like, and the level is TTL (transistor-transistor logic) level; one path is reserved for the image algorithm boards and is used for communication control between the image algorithm boards, an interface is RS232, and an interface converter adopts MAX 3232; the other path is a standby interface, the communication interface is RS485, and the interface converter adopts MAX 3485;
the 1-path gigabit Ethernet communication interface adopts an Ethernet interface carried by a processor, and an external PHY (physical layer) of the Ethernet communication interface adopts RTL8211 EG;
two paths of HDMI output display, because the Huashi HI3531A only supports one path of HDMI to be directly output, the other path is output after conversion, and an output encoder adopts SII 9022A;
the audio interface, 4-way audio input and 2-way audio output adopt TLV320AIC32IR chip, which supports 6-way single-end audio input and 6-way single-end audio output, and also supports 3 pairs of differential input and 4 pairs of differential output, communication interfaces I2S and I2C.
The switching value input adopts an optical coupling isolation input optical coupler TLP281-4, and a 24V level is converted into a TTL level to be connected with the FPGA;
the output of the switching value adopts a TTL level control relay of FPGA or a MOS tube to output a 24V/2A driving signal, and the relay adopts HFD4/5 or IRF7424 (PMOS).
DDR3 employs two 16-bit storage particles with 4GBIT capacity of IS43TR16256A-125KBLI, 8GBIT total;
NAND FLASH program storage is carried out using MT29F32G08ABAAAWP-IT chip with 32GBIT capacity.
Software arranged in the terminal has a development environment of Linux3.10 and is compiled by adopting C language. The FPGA development environment is Vivado 16.4, the FPGA development environment is written by a Verilog language, and the FPGA development environment is operated according to the following three parts of starting loading, initial configuration and peripheral driving to realize the monitoring and management of the vehicle condition: the processor boot load selects a parallel boot mode, plug-in NAND FLASH, to boot from an off-chip load. The serial port, the USB port, the mSATA port, the network port, the GPIO, the video image BT656 input, the HDMI output and the like are realized by a processor, the peripheral devices such as the switching value and the power supply auxiliary control interface are expanded by an FPGA, and the processor is a core control part. The initialization configuration adopts a Linux operating system to complete initialization of the processor, each functional peripheral provides an independent initialization function, and a driver of the functional peripheral provides an independent operating function interface.
Based on the scheme of 'processor + FPGA' in the mainstream of the industry, the image transmission between the central processing unit and the FPGA is synchronously interconnected by adopting a BT656 interface, the other communication control is asynchronously interconnected by adopting SPI and UART interfaces, the software is compiled by adopting C language, and a plurality of external aerial plugs are arranged on the main control board to realize the interconnection with each monitoring peripheral of the vehicle. The processor can select a Huashi HI3531A processor for video image compression storage operation control and support H264 video compression and decompression, and the FPGA selects a low-power-consumption high-performance A7 processor XC7A200T676 of XILINX company to realize video image preprocessing, auxiliary control, interface expansion and the like. The above are merely embodiments of the present invention, which are described in detail and with particularity, and therefore should not be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the spirit of the present invention, and these changes and modifications are within the scope of the present invention.
Claims (4)
1. The utility model provides a public safety scene oriented on-vehicle dynamic monitoring system which characterized in that, includes a plurality of vehicle mounted terminals, vehicle mounted terminal includes:
the high-definition video input interface is used for connecting and receiving high-definition video data acquired by the image acquisition equipment; the interface comprises 8 paths of high-definition SDI video input, and the high-definition SDI video input is merged into a video decoder GS2971 at the rear end after image equalization enhancement processing is carried out by adopting an SDI equalizer;
the combustible and explosive detection input interface is used for connecting combustible and explosive detection equipment and receiving combustible and explosive detection data;
the vehicle-mounted electronic information input interface is used for connecting a vehicle bus and acquiring vehicle-mounted electronic information;
the command input interface is used for receiving command commands;
the positioning navigation data input interface is used for connecting and receiving positioning data and navigation data acquired by the positioning navigation unit;
the video decoding module is connected with the high-definition video input interface and is used for decoding the high-definition video data received by the high-definition video input interface;
the image recognition unit comprises an image face recognition module and an image action behavior recognition module, receives the decoded high-definition video data output by the video decoding module, is respectively used for carrying out face recognition and action behavior recognition according to the decoded high-definition video data, outputs user information corresponding to a face according to the result of the face recognition, and outputs command data corresponding to the action according to the result of the action behavior recognition;
the central processing unit is used for receiving the command input by the command input interface, receiving positioning data and navigation data obtained by the positioning navigation data input interface, receiving user information and corresponding command data obtained by the image recognition unit, receiving decoded high-definition video data output by the video decoding module, performing video compression on the decoded high-definition video data, and outputting the compressed video data to the high-speed storage unit; the central processing unit is also communicated with a background data processing center correspondingly according to the inflammable and explosive detection data, the vehicle-mounted electronic information, the command, the positioning data and the navigation data, and outputs a video monitoring signal, an emergency forced stop signal, a one-key window breaking signal or a contact type vehicle interception signal; the processor and the FPGA are interconnected through 8 BT656 video synchronous parallel interfaces and an auxiliary communication interface SPI and a serial port;
the high-speed storage unit is connected with the central processing unit, receives compressed video data output after video compression in the central processing unit, and respectively stores the corresponding compressed video data, wherein the high-speed storage unit can adopt a standard disk with a mSATA interface for storage, and has 4 ports and single-port 2TB capacity;
further comprising:
the backstage data processing center is connected with a plurality of vehicle-mounted terminals arranged on different vehicles through a 4G network, and is used for: respectively receiving flammable and explosive detection data, vehicle-mounted electronic information, command commands, positioning data, navigation data and video monitoring signals reported by each vehicle-mounted terminal in real time, respectively monitoring whether the signals meet set requirements according to the conditions of each vehicle, and issuing command data to the corresponding vehicle-mounted terminal when the signals do not meet the set requirements;
each vehicle-mounted terminal in the vehicle-mounted dynamic monitoring system is also respectively connected with:
the system comprises image acquisition equipment, a vehicle-mounted terminal and a video processing device, wherein the image acquisition equipment is arranged on a vehicle, is connected with a high-definition video input interface of the vehicle-mounted terminal arranged on the vehicle and is used for acquiring high-definition video data and outputting the high-definition video data to the vehicle-mounted terminal;
the device comprises a vehicle-mounted terminal, an inflammable and explosive detection device and an inflammable and explosive detection device, wherein the inflammable and explosive detection device is arranged on the vehicle, is connected with an inflammable and explosive detection input interface of the vehicle-mounted terminal arranged on the vehicle, and is used for monitoring the states of inflammable volatile matters and explosives in real time, collecting inflammable and explosive detection data in real time and reporting the inflammable and explosive detection data to the vehicle-mounted terminal;
the positioning navigation unit is arranged on a vehicle, is connected with a positioning navigation data input interface of a vehicle-mounted terminal arranged on the vehicle, and is used for carrying out GPS positioning and outputting the obtained positioning data and corresponding navigation data to the vehicle-mounted terminal;
each vehicle-mounted terminal comprises the following steps: the method comprises the following steps that firstly, the central processing unit starts loading, a parallel guide mode is selected, a plug-in NAND FLASH is selected, and a 4-channel mSATA interface, an 8-channel high-definition SDI input interface, a 4G communication module and a MiniPCE interface thereof are started from off-chip loading;
secondly, initializing configuration of the central processing unit by adopting a Linux operating system, and initializing a video decoding module, an image recognition unit and a high-speed storage unit according to an external initialization function;
thirdly, providing independent operation function interfaces for driving programs corresponding to the 4G communication module, the image acquisition equipment, the flammable and combustible detection equipment and the positioning navigation unit;
fourthly, the video decoding module decodes the high-definition video data received by the high-definition video input interface; the image recognition unit receives the decoded high-definition video data output by the video decoding module, then carries out face recognition and action behavior recognition according to the decoded high-definition video data, outputs user information corresponding to a face according to the result of the face recognition, and outputs command data corresponding to the action according to the result of the action behavior recognition; the central processing unit performs video compression on the decoded high-definition video data and outputs the compressed video data to a high-speed storage unit; the central processing unit is also communicated with a background data processing center through the 4G communication module correspondingly according to the inflammable and explosive detection data, the vehicle-mounted electronic information, the command, the positioning data and the navigation data; the high-speed storage unit receives compressed video data output after the video compression in the central processing unit and respectively stores the corresponding compressed video data;
fifthly, the 4G communication module reports the inflammable and explosive detection data, the vehicle-mounted electronic information, the command, the positioning data, the navigation data and the video monitoring signal to a background data processing center in real time and receives command data sent by the background data processing center;
sixthly, outputting corresponding command data according to the flammable and explosive detection data, the vehicle-mounted electronic information, the command, the positioning data, the navigation data and the video monitoring signal which are reported by the background data processing center in real time aiming at each vehicle-mounted terminal, wherein the command data is issued: video monitoring signals, emergency forced stop signals, one-touch window breaking signals or contact type vehicle intercepting signals.
2. The public safety field-oriented vehicle-mounted dynamic monitoring system as claimed in claim 1, wherein the central processing unit is an FPGA chip or an ASIC chip, and has: the UART interface is used for realizing CAN bus interface conversion and RS485 interface conversion; the CAN bus interface comprises 2 paths with a Baud rate of 250Kbps, wherein one path is connected with a vehicle-mounted electronic information input interface, a flammable and explosive detection input interface and a positioning navigation data input interface and is used for transmitting vehicle-mounted electronic information, flammable and explosive detection data, positioning data and corresponding navigation data, and the other path is used as a spare for transmitting the vehicle-mounted electronic information, the flammable and explosive detection data, the positioning data and the corresponding navigation data when one path of the CAN bus interface is abnormal;
the RS485 interface is connected with the video decoding module and/or the image recognition unit and used as a standby interface for transmitting the high-definition video data when other interfaces connected with the video decoding module and/or the image recognition unit are abnormal.
3. The vehicle-mounted dynamic monitoring system oriented to the public safety site as claimed in any one of claims 1-2, wherein each vehicle-mounted terminal is further connected with a power supply unit and two +24V input power supplies respectively; the power supply unit is used for filtering and converting the +24V input power supply, and switching to another +24V input power supply for supplying power when detecting that the voltage of any +24V input power supply is lower than a threshold value;
each +24V input power supply is provided with a rectifier diode at an input interface thereof respectively to prevent the power supply from being reversely connected, and each +24V input power supply is also provided with a voltage stabilizing, voltage reducing and protecting circuit respectively to protect the power supply to stably supply power and output.
4. The vehicle-mounted dynamic monitoring system oriented to the public safety site as claimed in claim 3, wherein in the monitoring process, if any +24V input power supply voltage is monitored to be lower than a threshold value, the power supply unit switches an output signal of the power supply unit to another +24V input power supply to supply power.
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| CN112241698A (en) * | 2020-10-12 | 2021-01-19 | 安徽富煌科技股份有限公司 | Bus-mounted machine based on face recognition |
| CN112286805A (en) * | 2020-10-27 | 2021-01-29 | 上海埃维汽车技术股份有限公司 | Automatic test system based on Linux vehicle-mounted software |
| CN113533675A (en) * | 2021-06-28 | 2021-10-22 | 东莞福泽尔电子科技有限公司 | Flammable and explosive gas detection device and networking method |
| CN113470414A (en) * | 2021-06-30 | 2021-10-01 | 南京江宁公共交通信息科技有限公司 | Active safety system for public traffic driving |
| CN114485757A (en) * | 2021-12-15 | 2022-05-13 | 航天科工防御技术研究试验中心 | Test system and method for temperature and humidity sensor |
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