CN113625631A - Unattended microwave radar-camera node - Google Patents
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- CN113625631A CN113625631A CN202110914098.1A CN202110914098A CN113625631A CN 113625631 A CN113625631 A CN 113625631A CN 202110914098 A CN202110914098 A CN 202110914098A CN 113625631 A CN113625631 A CN 113625631A
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- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
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- G—PHYSICS
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Abstract
The invention discloses an unattended microwave radar-camera node, which is provided with a power supply and a double-microprocessor system, wherein the double-microprocessor system is formed by connecting a first microprocessor and a second microprocessor through serial ports; the first microprocessor is connected with a target detector through a single-pole double-throw switch, and the target detector consists of a microwave radar and a serial port camera; when the microwave radar detects the moving target, the first microprocessor controls the single-pole double-throw switch to be switched to the serial port camera, and the serial port camera is started to capture the image of the moving target. The node of the invention has the advantages of low power consumption and low false alarm probability.
Description
Technical Field
The invention relates to the technical field of wireless sensors, in particular to an unattended microwave radar-camera node.
Background
In recent thirty years, various vibration sensor nodes, vibration-sound sensor nodes, vibration-magnetic sensor nodes, vibration-sound-magnetic sensor nodes, and microwave radar-camera nodes with wireless networking functions have been developed continuously at home and abroad, and these nodes are collectively referred to as Wireless Sensor Network (WSN) nodes, also referred to as unattended ground sensor (T-UGS) nodes.
Among them, OWL developed and mass-produced by McQ company of AmericaTMA microwave radar trigger type camera (RDTC) node which is provided with functional modules such as a microwave radar, a 200 ten thousand pixel high-definition camera, an infrared light supplement lamp, a UHF wireless spread spectrum communication module, a microprocessor system, a GPS positioning module and an electronic compass,the system has self-positioning and self-networking functions, and can be used as a T-UGS node of a field wireless security/monitoring system. However, the radar is an active radio frequency sensor, microwave detection pulses need to be frequently transmitted, power consumption is high, and long-time work of the T-UGS node can be realized only by supplying power to a high-capacity lithium battery pack; in addition, when the weather influence is met in rainy days, the false alarm probability is increased.
Disclosure of Invention
In order to solve the problems, the invention provides a microminiature and low-power consumption unattended microwave radar-camera node to overcome the prior technical problems.
The invention adopts the following technical scheme:
an unattended microwave radar-camera node is provided with a power supply and a double-microprocessor system, wherein the double-microprocessor system is formed by connecting a first microprocessor and a second microprocessor through serial ports, and the first microprocessor and the second microprocessor are respectively connected with a plurality of functional modules;
the first microprocessor is connected with a target detector through a single-pole double-throw switch, the target detector consists of a microwave radar and a serial port camera, the microwave radar is used for detecting a moving target in front of the node, and the serial port camera is used for shooting an image of the moving target; when the microwave radar detects a moving target, the first microprocessor controls the single-pole double-throw switch to be switched to the serial port camera and starts the serial port camera to capture an image of the moving target;
the second microprocessor is connected with a wireless communication module, and the wireless communication module is used for realizing bidirectional communication between the nodes or between the nodes and an external handheld terminal.
Furthermore, the power supply adopts a lithium battery and a solar panel for hybrid power supply, and the power supply adopts a PMOS tube electronic switch to control the on or off of the power supply of each functional module in the node.
Further, the first microprocessor is further connected with an infrared light supplement lamp, an anti-condensation heater and a rain sound detector, the light wavelength of the infrared light supplement lamp is 940nm, the anti-condensation heater is used for heating a lens of the serial port camera, and the rain sound detector is used for detecting rain drops, triggering to turn off a power supply of the serial port camera and turning on a periodic detection mode of the microwave radar.
Further, the first microprocessor is also connected with a UHF wireless communication module, and the UHF wireless communication module is used for sending microwave radar data and moving target image data.
Furthermore, the first microprocessor is also connected with a ferroelectric memory, and the ferroelectric memory is used for storing a command dictionary, parameters and cache sampling data of the node.
Furthermore, the first microprocessor is also connected with a sound wave generator, and the sound wave generator is used as a self-checking auxiliary device of the rain sound detector.
Further, the wireless communication module connected with the second microprocessor comprises a VHF wireless communication module and a BLE wireless communication module, the VHF wireless communication module is used for realizing bidirectional communication between the nodes, and the BLE wireless communication module is used for bidirectional communication between the nodes and a handheld terminal.
Furthermore, the second microprocessor is further connected with a clock calendar module and a battery capacity detector, the clock calendar module is used for recording target detection time and synchronizing time among all nodes, and the battery capacity detector is used for monitoring the capacity of the battery in real time.
Furthermore, the second microprocessor is also connected with an electromagnetic buzzer and an anti-intrusion detector, the electromagnetic buzzer is used for indicating the initial state of the nodes during the node arrangement, and the anti-intrusion detector is used for judging whether the nodes are toppled or stolen during the node arrangement.
Furthermore, the first microprocessor and the second microprocessor are both provided with a Micro USB interface and an SWJ port, and the Micro USB interface and the SWJ port are used for developing and debugging the application program of the dual-microprocessor system.
After adopting the technical scheme, compared with the background technology, the invention has the following advantages:
1. the T-UGS node is a microminiature low-power-consumption wireless sensor node, is distributed around important facilities or on a border line key path in a manual distribution mode, and can be used for detecting and identifying invasion targets such as people, vehicles and the like;
2. the node of the invention adopts a double-microprocessor system (a first microprocessor and a second microprocessor which realize bidirectional communication through a serial port), wherein, the first microprocessor (MCU-1 board card) is mainly used for scheduling, managing and controlling a target detector (a microwave radar, a serial port camera and an additional functional module thereof) to realize signal acquisition and processing of the target detector, extraction and identification of target characteristics and wireless transmission of image data (a UHF wireless high-speed continuous data transmission module is configured); the second microprocessor (MCU-2 board card) is mainly used for realizing wireless communication and ad hoc network of the node;
3. the dual-microprocessor system has the following advantages: firstly, at any moment, the communication between the node and the monitoring terminal (relay node/base station node) can be kept through the VHF module, and meanwhile, image data can be transmitted to the monitoring terminal through the UHF module; updating the target detector (replacing the first microprocessor) can be realized on the premise of not changing the application program of the system ad hoc network; the target detection and the wireless networking communication can be simultaneously carried out, and the phenomenon of target missing detection or wireless communication unsmooth caused by the alternate work of the target detection and the wireless networking communication is avoided; fourthly, the complexity of the system application program design is simplified;
4. the rain sound detector and the sound wave signal generator (used for realizing the self-checking function of the rain sound detector) matched with the rain sound detector are utilized to judge whether the power supply of the target detector needs to be turned off, for example: under the meteorological conditions of medium rain, heavy rain and heavy rain, the power supply of the serial port camera affected by weather in rainy days can be automatically closed, and the periodic detection mode of the microwave radar is started, so that unnecessary target detection is avoided, and the power consumption and the false alarm probability are greatly reduced;
5. the node adopts the power supply which can be switched on/off to supply power to the target detector and other functional modules, and controls the on/off of the power supply of each functional module in the node by combining the electronic switch of the PMOS tube, so that the target detector and other functional modules can run in a time-sharing manner, and the power consumption of the node is reduced; sending 1000 pieces of alarm information to the outside (a monitoring terminal) every day, adopting 5200mAH lithium battery and low-power (3-5W) solar panel to supply power in a mixed manner, and enabling the node to continuously work for more than 30 days;
6. the remote 940nm infrared light supplement lamp and the lens anti-condensation heater are configured for the serial port camera, so that a clear field target image can be captured in the daytime and at night or under the weather condition of frost and condensation;
7. the initial states of the target detector and other functional modules in the node are indicated by the electromagnetic buzzer, so that the node arrangement speed can be increased.
Drawings
FIG. 1 is a node structure diagram of the present invention;
FIG. 2 is a circuit diagram of an interface of the microwave radar of the present invention;
FIG. 3 is a circuit diagram of an interface of the serial port camera of the present invention;
FIG. 4 is a circuit diagram of a single-pole double-throw analog switch of the present invention;
FIG. 5 is a circuit diagram of a 940nm infrared fill-in lamp driving/controlling circuit of the present invention;
fig. 6 is a circuit diagram of the anti-condensation heater of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Examples
An unattended microwave radar-camera node is provided with a power supply and a double-microprocessor system, wherein the microprocessor system comprises programs for microwave/image signal acquisition, processing, target feature extraction and identification, and programs for node positioning, networking communication and battery management.
As shown in fig. 1, the dual-microprocessor system is formed by connecting a first microprocessor (MCU-1 board card) and a second microprocessor (MCU-2 board card) through serial ports, wherein the first microprocessor and the second microprocessor are respectively connected to a plurality of functional modules;
the first microprocessor (MCU-1 board card) is connected with a target detector through a single-pole double-throw switch (2-SPDT), the target detector consists of a microwave radar and a serial camera, the microwave radar is used for detecting a moving target in front of the node, and the serial camera is used for shooting an image of the moving target; when the microwave radar detects a moving target, the first microprocessor controls the single-pole double-throw switch to be switched to the serial port camera, and starts the serial port camera to capture an image of the moving target.
The USART1 interface in the MCU _1 board card is expanded into a 2-way interface through a 2-way single-pole double-throw switch (2-SPDT), and the 2-way interface is respectively used for connecting a microwave radar (initially connected to a USART1 serial port) and a serial port camera, when the microwave radar detects a target, the MCU _1 controls the 2-SPDT to switch the serial port USART1 to the serial port camera, and the camera is started to capture a target image.
As shown in fig. 2, which is an interface circuit diagram of the microwave radar of the present invention, in this embodiment, a tri-state buffer gate circuit is used as an isolator between the microwave radar and the microprocessor system MCU _1, so that the anti-interference capability of the serial port lead can be improved, and the microprocessor system interface can be protected.
As shown in fig. 3, which is an interface circuit diagram of the serial port camera of the present invention, in this embodiment, a tri-state buffer gate circuit is used as an isolator between the serial port camera and the microprocessor system MCU _1 to improve the anti-interference capability of the serial port lead.
As shown IN fig. 4, which is a circuit diagram of a single-pole double-throw analog switch of the present invention, IN this embodiment, a single-pole double-throw (2-SPDT) analog switch is used to expand a USART1 serial port of a first microprocessor MCU _1 into 2 external interfaces, and the 2 external interfaces are respectively connected to a microwave radar and a serial port camera through a tristate buffer, wherein, the MCU _1-GPIO interface is set as an Open Drain (OD) and is connected to VDD _3V3 through pull-up resistors R9 and R10, so that control terminals IN1 and IN2 of the 2-SPDT are initially at a high level (H) -the microwave radar is connected to the MCU _1 serial port USART 1; when IN1 and IN2 become low (L), the serial camera is connected to the MCU _1 serial USART 1.
The second microprocessor (MCU-2 board card) is connected with a wireless communication module, and the wireless communication module is used for realizing bidirectional communication between the nodes or between the nodes and an external handheld terminal. The wireless communication module connected with the second microprocessor comprises a VHF wireless communication module (high-frequency wireless communication module) and a BLE wireless communication module (Bluetooth wireless communication module), the VHF wireless communication module is used for realizing bidirectional communication between the nodes (including a relay node and a base station node), and the BLE wireless communication module is used for bidirectional communication between the nodes and a handheld terminal when the nodes are deployed.
The power supply adopts the mixed power supply of lithium cell and solar cell panel, power supply adopts opening or closing of the power of each functional module in the PMOS pipe electron switch control node.
The power supplies of the target detector and other functional modules in the node are controllable, and the power supplies of the functional modules in the node are controlled to be turned on or turned off by combining the electronic switch of the PMOS tube, so that the target detector and other functional modules can run in a time-sharing manner, and the corresponding power supplies can be turned on/off according to actual needs, and the power consumption of the node is reduced; sending 1000 pieces of alarm information to the outside (a monitoring terminal) every day, adopting 5200mAH lithium battery and low-power (3-5W) solar panel to supply power in a mixed manner, and enabling the node to continuously work for more than 30 days; in addition, the microprocessor system and the wireless communication module of the node both adopt a sleep-wake-up working mode.
The first microprocessor is further connected with an infrared light supplement lamp, an anti-condensation heater, a sound generator and a rain sound detector, the light wavelength of the infrared light supplement lamp is 940nm, the anti-condensation heater is used for heating a lens of the serial port camera, the rain sound detector is used for detecting raindrop sound, triggering the power supply of the serial port camera to be turned off and turning on a periodic detection mode of the microwave radar, and the sound generator serves as a self-detection auxiliary device of the rain sound detector.
As shown in fig. 5, the 940nm infrared fill-in light driving/controlling circuit diagram is provided, wherein an LED driver U2 is used for exciting 4 infrared lamp beads (1-3W) connected in series, and Rs is a current-limiting resistor; the capacitors C9 and C10, the inductor L2 and the Schottky diode SD are selected according to the technical specification of U2. The working principle of the circuit is as follows: when the control end LED _ CTRL is at a high level, the PMOS tube is not conducted, the DIM of the input end of the U2 is at a zero level, and the U2 does not work; when the control terminal LED _ CTRL is at a low level, the PMOS transistor is turned on, and the voltage LXD _3V3 is divided by the resistor (R10+ RP) and the photo resistor VSR and then applied to the input terminal DIM of U2. When the resistance value of the photosensitive resistor VSR is large in the dark (low illumination) environment, the voltage applied to a DIM (diode-regulated) input end of U2 is larger than a threshold value, the U2 works, and the LED lamp beads are lightened; when the resistance of the photosensitive resistor VSR is small in the daytime (high illuminance) environment, the voltage applied to the input DIM of U2 is less than the threshold, and U2 does not work.
As shown in fig. 6, it is a circuit diagram of the anti-condensation heater of the present invention, wherein the silica gel heater circuit is composed of an and logic gate U, a darlington power tube Q, a negative temperature coefficient thermistor NTC, and other auxiliary electronic components, the NTC is attached to the bottom of the silica gel heating plate for measuring the temperature: when the temperature is very high (for example, 80 ℃), the resistor R3 is properly selected, so that after the voltage PWM _ VCC is divided by the R3 and the NTC, the voltage applied to the input terminal B of the and logic gate U is at a low level, that is, the and logic gate is turned off, and the voltage of the output terminal Y of the and logic gate is at a low level no matter whether the input terminal a is at a high level or a low level, so that the resistance wire in the silica gel heating sheet is not burnt out due to overheating; on the contrary, when the voltage applied to the input end B of the and logic gate is high level, the U is gated, the MCU _1 board sends a pulse width modulation signal FLD _ PWM to the input end a of the U through the GPIO port, the signal passes through the U and is divided by the resistors R4 and R5, and then the signal is applied to the base of the NPN darlington power transistor Q (Q on), so that the generated collector current Ic passes through the resistance wire in the silicon gel heating sheet to heat the resistor. In the mechanical structure, the circular silica gel heating plate is usually attached to the lens of the camera, so that the heat of the silica gel heating plate is transferred to the lens to achieve the purpose of eliminating the lens condensation.
The embodiment configures a long-distance 940nm infrared light supplement lamp device for the serial port camera to replace the existing short-distance 850nm infrared light supplement lamp panel, and also configures a camera lens anti-condensation heater to ensure that clear field target images can be captured and photographed no matter at daytime or night or under the meteorological condition of frosting and condensation. In addition, a rain sound detector for detecting rain above the middle rain and a sound wave signal generator (for realizing the self-checking function of the rain sound detector) matched with the rain sound detector are also arranged, so that the power supply of the camera can be automatically turned off and the periodic detection mode of the microwave radar can be turned on under the meteorological conditions of middle rain, heavy rain and heavy rain, and the power consumption and the false alarm probability are greatly reduced.
The first microprocessor is also connected with a UHF wireless communication module (ultra high frequency wireless communication module), and the UHF wireless communication module is used for sending microwave radar data and moving target image data.
The first microprocessor is further connected with a ferroelectric memory, and the ferroelectric memory is used for storing the command dictionary, the parameters and the cache sampling data of the nodes.
The second microprocessor is further connected with a clock calendar module and a battery capacity detector, the clock calendar module is used for recording target detection time and synchronizing time among all nodes, and the battery capacity detector is used for monitoring the capacity of the battery in real time.
The second microprocessor is further connected with an electromagnetic buzzer and an anti-intrusion detector, the electromagnetic buzzer is used for indicating the initial state of the nodes during arrangement, and the anti-intrusion detector is used for judging whether the nodes are toppled or stolen during arrangement.
The first microprocessor and the second microprocessor are both provided with a Micro USB interface and an SWJ port, and the Micro USB interface and the SWJ port are used for developing and debugging the application program of the dual-microprocessor system.
The node of this embodiment is basically configured as follows:
(1) the system comprises a microminiature microwave radar, a JPEG serial port camera, a rain sound detector and a Tamper sensor;
(2) microminiature millimeter wave radar: azimuth plane (-6dB) ± 45 ° (horizontal), pitch plane (-6dB) ± 11 °; the monitoring range is 2-40 m (human) and 2-100 m (vehicle);
(3) JPEG serial camera: the monitoring angle (FOV) is 30 degrees, and the monitoring distance is 0.01-35 m;
(4) the system comprises a LoRaTM direct sequence spread spectrum (160-170 MHz) LoRa wireless communication module and a rubber rod antenna;
(5) a high-speed continuous data transmission wireless communication module (425-450.5 MHz) and a rubber rod antenna;
(6) BLE4.2/5.0 Bluetooth module and PCB antenna;
(7) AES128 or 256 bit encryption;
(8)2 USB interfaces (used for development and debugging of the micro-processing system);
(9) a moving coil type buzzer (used for prompting the working state when the nodes are distributed);
(10)3.7V/5.2Ah lithium battery/3W solar panel (effective working time is more than 30 days);
(11) 200X 100X 70mm (customizable); weight: 500g (customizable);
(12) working temperature: -25 ℃ to 65 ℃;
(13) protection grade: IP 67.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. An unattended microwave radar-camera node, characterized in that: the node is provided with a power supply and a double-microprocessor system, the double-microprocessor system is formed by connecting a first microprocessor and a second microprocessor through serial ports, and the first microprocessor and the second microprocessor are respectively connected with a plurality of functional modules;
the first microprocessor is connected with a target detector through a single-pole double-throw switch, the target detector consists of a microwave radar and a serial port camera, the microwave radar is used for detecting a moving target in front of the node, and the serial port camera is used for shooting an image of the moving target; when the microwave radar detects a moving target, the first microprocessor controls the single-pole double-throw switch to be switched to the serial port camera and starts the serial port camera to capture an image of the moving target;
the second microprocessor is connected with a wireless communication module, and the wireless communication module is used for realizing bidirectional communication between the nodes or between the nodes and an external handheld terminal.
2. An unattended microwave radar-camera node according to claim 1, wherein: the power supply adopts the mixed power supply of lithium cell and solar cell panel, power supply adopts opening or closing of the power of each functional module in the PMOS pipe electron switch control node.
3. An unattended microwave radar-camera node according to claim 2, wherein: the first microprocessor is further connected with an infrared light supplement lamp, an anti-condensation heater and a rain sound detector, the light wavelength of the infrared light supplement lamp is 940nm, the anti-condensation heater is used for heating a lens of the serial port camera, and the rain sound detector is used for detecting raindrop sound, triggering the power supply of the serial port camera to be turned off and turning on a periodic detection mode of the microwave radar.
4. An unattended microwave radar-camera node according to claim 3, wherein: the first microprocessor is further connected with a UHF wireless communication module, and the UHF wireless communication module is used for sending microwave radar data and moving target image data.
5. An unattended microwave radar-camera node according to claim 4, wherein: the first microprocessor is further connected with a ferroelectric memory, and the ferroelectric memory is used for storing the command dictionary, the parameters and the cache sampling data of the nodes.
6. An unattended microwave radar-camera node according to claim 5, wherein: the first microprocessor is also connected with a sound wave generator which is used as a self-checking auxiliary device of the rain sound detector.
7. An unattended microwave radar-camera node according to claim 2, wherein: the wireless communication module connected with the second microprocessor comprises a VHF wireless communication module and a BLE wireless communication module, the VHF wireless communication module is used for realizing bidirectional communication between the nodes, and the BLE wireless communication module is used for bidirectional communication between the nodes and a handheld terminal.
8. An unattended microwave radar-camera node according to claim 7, wherein: the second microprocessor is further connected with a clock calendar module and a battery capacity detector, the clock calendar module is used for recording target detection time and synchronizing time among all nodes, and the battery capacity detector is used for monitoring the capacity of the battery in real time.
9. An unattended microwave radar-camera node according to claim 8, wherein: the second microprocessor is further connected with an electromagnetic buzzer and an anti-intrusion detector, the electromagnetic buzzer is used for indicating the initial state of the nodes during arrangement, and the anti-intrusion detector is used for judging whether the nodes are toppled or stolen during arrangement.
10. An unattended microwave radar-camera node according to any one of claims 1 to 9, characterised in that: the first microprocessor and the second microprocessor are both provided with a Micro USB interface and an SWJ port, and the Micro USB interface and the SWJ port are used for developing and debugging the application program of the dual-microprocessor system.
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