CN113625261B - Unattended node of microwave radar-microphone array acoustic wave detector - Google Patents
Unattended node of microwave radar-microphone array acoustic wave detector Download PDFInfo
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- CN113625261B CN113625261B CN202110915563.3A CN202110915563A CN113625261B CN 113625261 B CN113625261 B CN 113625261B CN 202110915563 A CN202110915563 A CN 202110915563A CN 113625261 B CN113625261 B CN 113625261B
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/50—Systems of measurement based on relative movement of target
- G01S13/58—Velocity or trajectory determination systems; Sense-of-movement determination systems
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H11/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties
- G01H11/06—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B3/00—Audible signalling systems; Audible personal calling systems
- G08B3/10—Audible signalling systems; Audible personal calling systems using electric transmission; using electromagnetic transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- General Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Electromagnetism (AREA)
- Radar Systems Or Details Thereof (AREA)
- Burglar Alarm Systems (AREA)
Abstract
The invention discloses an unattended microwave radar-microphone array sound wave detector node, which adopts a double-microprocessor system, wherein a first microprocessor is connected with a sound wave signal generator, a target detector and a rain sound detector, and the target detector comprises a microwave radar and a microphone array sound wave detector; the microwave radar comprises a trigger detection mode and a periodic detection mode; the microphone array acoustic wave detector is used for detecting environmental noise and triggering a microwave radar to start a triggering type detection mode; the rain sound detector is used for detecting click sound of raindrops on the node shell and triggering the microwave radar to start a periodic detection mode; the second microprocessor is connected with a wireless communication module, and the wireless communication module is used for realizing two-way communication between nodes or between the nodes and an external handheld terminal. The node 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-microphone array acoustic wave detector node.
Background
In recent thirty years, a plurality of vibration sensor nodes, vibration-sound sensor nodes, vibration-magnetic sensor nodes, vibration-sound-magnetic sensor nodes and microwave radar-camera nodes with wireless networking function are developed in succession at home and abroad, and the nodes are collectively called Wireless Sensor Network (WSN) nodes and also called unattended ground sensor (T-UGS) nodes.
In China, the microminiature microwave radar is mainly used for measuring the speed of a vehicle or is fixedly arranged on the periphery of an attended area as security equipment, but the existing microminiature radar T-UGS node has the defects of high power consumption and high false alarm probability.
Disclosure of Invention
In order to solve the problems, the invention provides a microminiature, low power consumption, high sensitivity and intelligent unattended microwave radar-microphone array acoustic wave detector node, which is used for overcoming the prior technical problems.
The invention adopts the following technical scheme:
an unattended microwave radar-microphone array acoustic wave detector node is arranged in a node shell, the node is provided with a power supply and a dual-microprocessor system, and the dual-microprocessor system is formed by connecting a first microprocessor and a second microprocessor through a serial port;
the first microprocessor is connected with an acoustic wave signal generator, a target detector and a rain sound detector, wherein the target detector comprises a microwave radar and a microphone array acoustic wave detector;
the microwave radar is used for detecting a moving target and comprises a trigger detection mode and a periodic detection mode; the microphone array sound wave detector is used for detecting environmental noise and triggering the microwave radar to start a triggering type detection mode; the rain sound detector is used for detecting click sound of raindrops on the node shell and triggering the microwave radar to start a periodic detection mode;
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.
Further, the power supply adopts lithium batteries and solar panels for mixed power supply.
Further, the acoustic wave signal generator is used for self-detection of the microphone array acoustic wave detector, self-adaptive adjustment of signal gain and alarm threshold.
Further, the wireless communication module comprises a VHF wireless communication module and a BLE wireless communication module, wherein the VHF wireless communication module is used for realizing two-way communication between the nodes, and the BLE wireless communication module is used for two-way communication between the nodes and the handheld terminal.
Further, the first microprocessor is further connected with a ferroelectric memory, and the ferroelectric memory is used for storing the command dictionary, parameters and cache sampling data of the nodes.
Further, the second microprocessor is also connected with a battery power detector, and the battery power detector is used for monitoring the power of the battery in real time.
Further, the second microprocessor is also connected with a clock calendar module, and the clock calendar module is used for recording the time of the target detector and the synchronous time.
Further, the second microprocessor is also connected with an electromagnetic buzzer, and the electromagnetic buzzer is used for indicating an initial state when the node is laid.
Further, the second microprocessor is also connected with an anti-intrusion detector, and the anti-intrusion detector is used for judging whether the node is toppled or stolen during the laying period.
Further, the first microprocessor and the second microprocessor are respectively provided with a Micro USB interface and an SWJ port, and the Micro USB interface and the SWJ ports are used for developing and debugging application programs of the dual-microprocessor system.
After the technical scheme is adopted, compared with the background technology, the invention has the following advantages:
1. the node is a microminiature, low-power consumption and high-sensitivity intelligent sensor node, and is manually arranged around important facilities or along border lines, so that the node can be used for detecting and identifying invasion targets such as people, vehicles and the like;
2. the invention adopts a dual microprocessor system (namely a first microprocessor and a second microprocessor), which realize two-way communication through serial ports, respectively manage and control the target detector and the wireless communication module, can keep the communication between the node and the monitoring terminal (relay node/base station node) at any time, and can realize the updating of the target detector (the first microprocessor is replaced) on the premise of not changing the application program of the system ad hoc network; in addition, the method can simultaneously perform target detection and wireless networking communication, and avoid the phenomena of target detection omission or unsmooth wireless communication possibly occurring due to the alternate work of the target detection and the wireless networking communication; furthermore, the dual-micro processing system structure is adopted, so that the complexity of system application program design is simplified;
3. the microphone array sound wave detector is adopted to trigger the microwave radar to start a triggering type detection mode for target detection, so that the power consumption of the microwave radar can be reduced to the greatest extent; in addition, a rain sound detector arranged in the node shell is used for detecting the sound of the node shell hit by rain drops, and under the meteorological conditions of medium rain, heavy rain and heavy rain, the first microprocessor can be triggered to close the microphone array sound wave detector and start a periodic detection mode of the microwave radar so as to reduce the false alarm probability of the node;
4. the power supply which can be turned on/off is adopted to supply power to the target detector and other functional modules so as to realize time-sharing operation of the target detector and each functional module in the node, and further reduce the power consumption of the node;
5. the node is provided with an acoustic wave signal generator as a signal source, and the signal gain and the warning threshold value of the microphone array acoustic wave detector can be automatically adjusted according to the external conditions of the node arrangement area, so that the sensitivity and the warning threshold value of the microphone array acoustic wave detector can reach the optimal values no matter under any external conditions, and the detection probability of the node is further improved;
6. when the node of the invention is laid, the second microprocessor controls the electromagnetic buzzer to make different sounds so as to indicate the initial state of each functional module in the node and accelerate the laying speed of the node.
Drawings
FIG. 1 is a block diagram of a node of the present invention;
FIG. 2 is a circuit diagram of an electronic switch of a PMOS tube;
FIG. 3 is a diagram of a microphone excitation source and signal conditioning circuitry, wherein FIG. 3 (a) is a diagram of an electret microphone pre-amp filter circuit; FIG. 3 (b) is a signal envelope detection and level adjustment circuit of the acoustic wave detector; fig. 3 (c) is an adaptive adjustment circuit for the target detector signal gain and alarm threshold.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Examples
The embodiment provides an unattended microwave radar-microphone array acoustic wave detector node, hereinafter referred to as T-UGS node, which is installed inside a node shell, and the node is provided with a power supply and a dual microprocessor system.
The power supply adopts a lithium battery and a solar panel for mixed power supply, and adopts a PMOS tube electronic switch (shown in figure 2) to control the on or off of the power supply of the microphone array acoustic wave detector and other functional modules in the node, thereby realizing the time-sharing work of the functional modules. The power supply can be turned on or off as required, specifically, a 3.7V/5.2Ah lithium battery/3W solar panel is adopted for mixed power supply, 1000 pieces of report information are sent to the outside (monitoring terminal) every day, the effective working time is longer than 30 days, and the power supply capable of being turned on/off is adopted for supplying power to the target detector and other functional modules, so that the time-sharing operation of the target detector and each functional module in the node is realized, and the power consumption of the node is further reduced.
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; the MCU_1 board card is mainly used for scheduling and controlling target detectors (microwave radar and microphone array acoustic detectors), realizing the self-adaptive adjustment of signal gain and trigger threshold of the microphone array acoustic detectors, and collecting and processing target detector signals and extracting and identifying target features; the MCU_2 board card is mainly used for realizing the functions of wireless communication and ad hoc network of the T-UGS node.
The first microprocessor is connected with an acoustic wave signal generator, a target detector, a rain sound detector and a ferroelectric memory, wherein the target detector comprises a microwave radar and a microphone array acoustic wave detector;
the sound wave signal generator is used for self-checking of the microphone array sound wave detector, self-adaptive adjustment of signal gain and alarm threshold; the acoustic wave signal generator configured by the node in this embodiment is used as a signal source, and the signal gain and the alarm threshold of the microphone array acoustic wave detector can be automatically adjusted according to the external conditions of the node arrangement area, so that the sensitivity and the alarm threshold of the microphone array acoustic wave detector can reach the optimal values no matter under any external conditions, and the detection probability of the node is further improved.
The microwave radar adopts a microminiature millimeter wave radar, is used for detecting a moving target and comprises a trigger detection mode and a periodic detection mode;
the microphone array sound wave detector is used for detecting environmental noise and triggering the microwave radar to start a triggering type detection mode; the embodiment adopts a high-sensitivity waterproof type capacitor electret microphone array as a probe, and combines a microphone excitation source and a signal conditioning circuit (shown in fig. 3) to form the microphone array sound wave detector, wherein the signal conditioning circuit comprises a preamplifier (shown in fig. 3 (a)), an envelope detection circuit (shown in fig. 3 (b)) and a signal gain and warning threshold self-adaptive regulation circuit (shown in fig. 3 (c)). By adopting the triggering detection mode, the power consumption of the microwave radar can be reduced to the maximum extent.
Fig. 3 (a) is a circuit diagram of an electret microphone (hereinafter referred to as MIC) pre-amplification filter, in which: the power supply SND_VCC, the resistors R1 and R2 form an MIC excitation source, and the capacitors C1 and C2 are used for power supply filtering; resistors R3 and R4 serve as voltage dividers to provide reference levels for a single-power low-power audio amplifier (U1-1/2); capacitor C3 and resistor (R3// R4) form a blocking filter; the audio amplifier (U1-1/2), the capacitor C5, the resistors R5 and R6 form a primary in-phase high-pass amplifier, and the capacitor C6 is used as a feedback compensation capacitor of the audio amplifier; the resistor R7 and the capacitor C6 form a first-order low-pass filter; the audio amplifier (U1-2/2), the capacitor C7, the resistors R8 and R9 form a secondary in-phase high-pass amplifier, and the capacitor C8 serves as a feedback compensation capacitor. The gain of the pre-amplifying filter circuit is about 230 times, and the frequency band is limited between 300 Hz and 3400 Hz.
Fig. 3 (b) shows a signal envelope detection and level adjustment circuit of the acoustic wave detector. Wherein the capacitor C9 and the resistor R10 constitute a blocking filter; the low-power-consumption operational amplifier (U2), the diode D, the resistors R11, R12 and R13 and the capacitor C10 form an envelope detector, the charging time constant is τ1=R11×C10, the discharging time constant is τ2 ∈ (R12// R13) ×C2, and τ2> > τ1 is provided. The main function of the schottky diode SD is to reduce the dc component of the amplitude envelope signal.
Fig. 3 (c) is an adaptive adjustment circuit for the target detector signal gain and alarm threshold. The low-power-consumption operational amplifier (U01), the resistors R01, R02, R03 and the IIC numerical control potentiometer (U02-1/2) form a gain-controllable homodromous amplifying circuit; the resistor R04 and the capacitor C01 form a first-order low-pass filter (the cut-off frequency is smaller than 10 Hz); the comparator (U03, OTC output), the IIC numerical control potentiometer (U2-2/2) and the resistor R05 form a comparator circuit with adjustable threshold, the capacitor C02 is used for filtering threshold noise, and the resistor R06 and the light-emitting diode VD are used for displaying the output state of the comparator.
The rain sound detector is used for detecting click sounds of rain drops on the node shell and triggering the microwave radar to start a periodic detection mode, and is an acoustic wave detector arranged in the shell;
the ferroelectric memory is used for storing the command dictionary, parameters and cache sampling data of the nodes.
According to the embodiment, the microphone array acoustic wave detector is adopted to trigger the microwave radar to start the triggering type detection mode for target detection, so that the power consumption of the microwave radar can be reduced to the greatest extent; in addition, the sound of the node shell is detected by combining the rain sound detector arranged in the node shell, and the first microprocessor can be triggered to close the microphone array sound wave detector and start the periodic detection mode of the microwave radar under the meteorological conditions of medium rain, heavy rain and heavy rain so as to reduce the false alarm probability of the node.
The second microprocessor is connected with a wireless communication module, a battery power detector, a clock calendar module, an electromagnetic buzzer and an anti-intrusion detector.
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 comprises a VHF wireless communication module (high-frequency wireless communication module) and a BLE wireless communication module (Bluetooth wireless communication module), wherein the VHF wireless communication module is used for realizing two-way communication between the nodes, and the BLE wireless communication module is used for two-way communication between the nodes and the handheld terminal.
The battery electric quantity detector is used for monitoring the electric quantity of the battery in real time.
The clock calendar module is used for recording the time of the target detector and the synchronous time.
The electromagnetic buzzer is used for indicating the initial state of the node when the node is laid, and when the node is laid, the second microprocessor controls the electromagnetic buzzer to make different sounds so as to indicate the initial state of each functional module in the node and accelerate the laying speed of the node.
The anti-intrusion detector is used for judging whether the node is toppled or stolen during the arrangement period.
In addition, the first microprocessor and the second microprocessor are respectively provided with a Micro USB interface and an SWJ port, and the Micro USB interface and the SWJ ports are used for developing and debugging application programs of the dual-microprocessor system.
The node in the embodiment is a microminiature, low-power consumption and high-sensitivity intelligent sensor node, and is manually arranged around important facilities or along border lines, so that the node can be used for detecting and identifying invasion targets such as people, vehicles and the like; the embodiment adopts a dual microprocessor system (namely a first microprocessor and a second microprocessor), which realize two-way communication through serial ports, respectively manage and control the target detector and the wireless communication module, can keep communication between the node and the monitoring terminal (relay node/base station node) at any time, and can realize updating of the target detector (change the first microprocessor) on the premise of not changing the application program of the system ad hoc network; in addition, the method can simultaneously perform target detection and wireless networking communication, and avoid the phenomena of target detection omission or unsmooth wireless communication possibly occurring due to the alternate work of the target detection and the wireless networking communication; furthermore, the dual-microprocessor system structure is adopted, so that the complexity of the system application program design is simplified.
The T-UGS node of the embodiment has functions of remote node configuration parameters, communication modes and the like, so that the T-UGS node can be used as a target detector node and also can be used as a relay, a relay/detection node or a base station node.
The basic configuration of the T-UGS node of this embodiment is as follows:
(1) Microminiature millimeter wave radar: azimuth (-6 dB): 45 ° (horizontal), pitch (-6 dB): 11 °; monitoring range: 2-40 m (people), 2-100 m (vehicles);
(2)LoRa TM a direct sequence spread spectrum (160-170 MHz) LoRa wireless communication module and a rubber rod antenna;
(3) BLE4.2/5.0 Bluetooth module, PCB antenna;
(4) AES128 or 256 bit encryption;
(5) 2 USB interfaces;
(6) A moving coil buzzer;
(7) 3.7V/5.2Ah lithium battery/3W solar panel;
(8) Shell dimensions: 200X 100X 70mm (customizable); the weight of the shell is as follows: 450g (customizable);
(9) Operating temperature: -25-65 ℃;
(10) Protection grade: IP67.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (9)
1. An unattended microwave radar-microphone array acoustic wave detector node, characterized in that: the node is arranged in a node shell, the node is provided with a power supply and a dual-microprocessor system, and the dual-microprocessor system is formed by connecting a first microprocessor and a second microprocessor through a serial port;
the first microprocessor is connected with an acoustic wave signal generator, a target detector and a rain sound detector, wherein the target detector comprises a microwave radar and a microphone array acoustic wave detector;
the microwave radar is used for detecting a moving target and comprises a trigger detection mode and a periodic detection mode; the microphone array sound wave detector is used for detecting environmental noise and triggering the microwave radar to start a triggering type detection mode; the rain sound detector is used for detecting click sound of raindrops on the node shell and triggering the microwave radar to start a periodic detection mode;
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;
the wireless communication module comprises a VHF wireless communication module and a BLE wireless communication module, wherein the VHF wireless communication module is used for realizing two-way communication between the nodes, and the BLE wireless communication module is used for two-way communication between the nodes and the handheld terminal.
2. An unattended microwave radar-microphone array acoustic wave detector node according to claim 1, wherein: the power supply adopts lithium batteries and solar panels to supply power in a mixed mode.
3. An unattended microwave radar-microphone array acoustic wave detector node according to claim 2, wherein: the sound wave signal generator is used for self-checking of the microphone array sound wave detector, self-adaptive adjustment of signal gain and alarm threshold.
4. An unattended microwave radar-microphone array acoustic wave detector node according to claim 1, wherein: the first microprocessor is also connected with a ferroelectric memory, and the ferroelectric memory is used for storing the command dictionary, parameters and cache sampling data of the nodes.
5. An unattended microwave radar-microphone array acoustic wave detector node according to claim 1, wherein: the second microprocessor is also connected with a battery power detector, and the battery power detector is used for monitoring the power of the battery in real time.
6. An unattended microwave radar-microphone array acoustic wave detector node according to claim 5, wherein: the second microprocessor is also connected with a clock calendar module, and the clock calendar module is used for recording the time of the target detector and the synchronous time.
7. An unattended microwave radar-microphone array acoustic wave detector node according to claim 6, wherein: the second microprocessor is also connected with an electromagnetic buzzer, and the electromagnetic buzzer is used for indicating the initial state of the node when being laid.
8. An unattended microwave radar-microphone array acoustic wave detector node according to claim 7, wherein: the second microprocessor is also connected with an anti-intrusion detector which is used for judging whether the node is toppled over or stolen during the arrangement period.
9. An unmanned microwave radar-microphone array acoustic wave detector node according to any of claims 1 to 8, wherein: the first microprocessor and the second microprocessor are respectively provided with a Micro USB interface and an SWJ port, and the Micro USB interface and the SWJ ports are used for developing and debugging application programs of the dual-microprocessor system.
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