CN114531744A - Emergency lifesaving wireless communication terminal and lifesaving searching method thereof - Google Patents
Emergency lifesaving wireless communication terminal and lifesaving searching method thereof Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
- H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
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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
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/14—Receivers specially adapted for specific applications
- G01S19/17—Emergency applications
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/02—Alarms for ensuring the safety of persons
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
- G08B25/01—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
- G08B25/08—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium using communication transmission lines
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
- G08B25/01—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
- G08B25/10—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium using wireless transmission systems
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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
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7073—Synchronisation aspects
- H04B1/7075—Synchronisation aspects with code phase acquisition
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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
- H04W4/90—Services for handling of emergency or hazardous situations, e.g. earthquake and tsunami warning systems [ETWS]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
- H04W52/0248—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal dependent on the time of the day, e.g. according to expected transmission activity
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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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Abstract
The invention provides a distress lifesaving wireless communication terminal and a lifesaving searching method thereof, wherein the distress lifesaving wireless communication terminal comprises a power supply unit and an internal circuit unit, wherein the power supply unit comprises a lithium battery pack and a power supply management module; the internal circuit unit comprises a Beidou positioning module, a water immersion detection circuit module, a micro control chip module, a digital algorithm processing chip FPGA module, a radio frequency transceiving chip module and a radio frequency front end module. After the emergency lifesaving wireless communication terminal is started, the emergency lifesaving working process is started, a distress signal with positioning information is output, and the search and rescue center transmits a search information signal. After the emergency lifesaving wireless communication terminal is in contact with the search and rescue center, the search and rescue center obtains the position and distance information of the emergency lifesaving wireless communication terminal and carries out rescue. The invention can realize long-distance communication, has large search and rescue coverage, real-time search and rescue positioning capability, small volume, light weight and good application environment applicability.
Description
Technical Field
The invention relates to the field of communication equipment, in particular to a rescue wireless communication terminal in distress and a rescue searching method thereof.
Background
With the increase of global activities of human beings, various emergent distress events, such as air distress, fishing boat distress, field exploration distress, geological disaster distress and the like, are increased. When a distress condition occurs, if a person in distress can send a specific distress signal to the outside, the rescue person can quickly, accurately and effectively carry out rescue actions by acquiring the distress signal.
At present, the international general radio lifesaving method is to position the equipment in danger by satellite and transmit the position information of the equipment in danger to the ground station. Generally, the aircraft and the ship are basically provided with international radio distress equipment, and the equipment has large volume and high price.
The Qingdao Jirui automation company Limited and the seven-six research institute of the ship re-engineering group of China disclose a utility model patent (205861908U) of a field emergency search and rescue terminal. The terminal comprises a positioning communication device, a connecting cable, a power supply control device and a shell, wherein the positioning communication device and the power supply control device are separately placed in different shells, and the power supply control device comprises a power supply module and a control module. The power supply control device is connected with the positioning communication device through a cable, the power supply module supplies power for all module loads, and after the control module detects the alarm signal, the positioning communication device is started to receive Beidou positioning information, position information is sent to the search and rescue center, and a feedback signal sent by the search and rescue center is received. The power module in the field emergency search and rescue terminal is large in size, heavy in weight and not beneficial to carrying.
The existing emergency lifesaving communication terminal has the obvious defects of incomplete functions. Firstly, the wireless data transmission part in the existing rescue communication terminal in danger mostly adopts data transmission modules or devices commonly used in the market, and is not developed specially for remote search and rescue, the transmission distance is limited, and the remote communication is difficult to realize, so that the search and rescue coverage is small, and the success rate of the search and rescue is directly influenced. Secondly, the existing rescue communication terminal in danger is single in positioning mode and lacks auxiliary means, the positioning information of the Beidou or GPS is transmitted to the search and rescue center, the search and rescue center positions the specific position of the person in danger through the received Beidou or GPS information, and once the rescue terminal in danger cannot obtain the Beidou or GPS positioning information, the positioning search and rescue cannot be carried out completely. At present, no matter the power consumption of the equipment is large, and the power supply materials are added for prolonging the working time, so that the volume and the weight of the equipment are large, and the equipment is not easy to carry or install.
Disclosure of Invention
The invention aims to provide an emergency lifesaving wireless communication terminal and a lifesaving searching method thereof, aiming at solving the problems in the prior art, wherein the emergency lifesaving wireless communication terminal can realize remote communication, has large search and rescue coverage, real-time search and rescue positioning capability, small volume, light weight, portability and good application environment applicability.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme.
The utility model provides a lifesaving wireless communication terminal in distress, includes power supply unit, internal circuit unit, its characterized in that:
(1) the power supply unit is used for supplying power to the internal circuit module, and is used for triggering startup management and manual startup in a soaking mode;
the power supply unit comprises a lithium battery pack and a power supply management module,
the lithium battery pack is used for supplying power to the internal circuit module;
the power supply management module is used for manually triggering startup management and soaking startup management;
(2) the internal circuit unit comprises a Beidou positioning module, a water immersion detection circuit module, a micro control chip module, a digital algorithm processing chip FPGA module, a radio frequency transceiving chip module and a radio frequency front end module;
the Beidou positioning module is used for providing positioning information of the terminal;
the immersion detection circuit module is used for providing an immersion alarm signal of the terminal;
the micro-control chip module is used for receiving the flooding alarm signal provided by the flooding detection circuit module, transmitting the flooding alarm signal to the power supply unit, starting flooding by the power supply unit to trigger starting management, and starting a flooding life-saving working process by using positioning information provided by the Beidou positioning module; the system comprises a power supply unit, a Beidou positioning module, a power supply unit and a power supply unit, wherein the power supply unit is used for receiving a manual trigger starting signal of the power supply unit and starting an active distress life-saving working process by utilizing positioning information provided by the Beidou positioning module; the system is used for outputting a distress signal with positioning information;
the digital algorithm processing chip FPGA module is used for receiving the search information digital signal output by the radio frequency transceiver chip module; the system comprises a micro-control chip module, a positioning module and a control module, wherein the micro-control chip module is used for receiving a distress signal with positioning information output by the micro-control chip module and generating an audio alarm signal; the method is used for carrying out a high-sensitivity communication waveform algorithm, and improves the sensitivity of various signals: sequentially carrying out convolutional coding, framing, spread spectrum and BPSK modulation algorithm processing on a data signal to be transmitted to generate a baseband signal; carrying out BPSK demodulation, frame capture, code tracking, carrier synchronization, despreading, Viterbi decoding and synchronous code detection algorithm processing on the received search information digital signal in sequence to generate a response information signal with a self number;
the radio frequency transceiving chip module is used for receiving the baseband signal output by the FPGA module of the digital algorithm processing chip, performing digital-to-analog conversion, frequency mixing and filtering processing on the baseband signal and generating a transmitting signal; the system comprises a radio frequency front end, a frequency mixing unit and a filter unit, wherein the radio frequency front end is used for receiving a search information signal output by the radio frequency front end, and performing analog-to-digital conversion, frequency mixing and filtering processing on the search information signal to generate a search information digital signal;
the radio frequency front end module is used for receiving the transmitting signal output by the radio frequency receiving chip transmitting module, amplifying the power of the transmitting signal and transmitting the transmitting signal through an antenna; the radio frequency transceiver module is used for receiving a search information signal sent by the search and rescue center, amplifying the power of the search information signal and outputting the search information signal to the radio frequency transceiver module.
Preferably, the distress lifesaving wireless communication terminal further comprises a Bluetooth module, and the Bluetooth module sends the information of the distress person to a search and rescue center through an SOS key.
Preferably, the distress lifesaving wireless communication terminal further comprises a Flash module.
Preferably, the digital algorithm processing chip FPGA module generates the audio alarm signal, and is implemented by the following method:
an amplitude modulation AM alarm signal with specific sound effect is designed, the rescue wireless communication terminal in danger emits the signal at intervals when in danger, and the search and rescue center can demodulate and play the received signal through the amplitude modulation AM and hear the alarm sound intuitively.
The invention provides a lifesaving searching method based on a wireless communication terminal for lifesaving in distress, which is characterized by comprising the following steps:
step 1, when the distress lifesaving wireless communication terminal is not started, the distress lifesaving wireless communication terminal is in a low power consumption mode; after the emergency lifesaving wireless communication terminal is manually started or is triggered to be started after being soaked in water, the Beidou positioning module RNSS is started to position, the emergency lifesaving wireless communication terminal transmits a distress signal with positioning information, a dormancy awakening mechanism is started, the working state and the dormancy state are continuously switched when the emergency lifesaving wireless communication terminal receives the distress signal, and meanwhile, an audio alarm signal is transmitted; if the search information of the search and rescue center is received in the process, after the search and rescue center is connected, the search and rescue center enters a response receiving mode, and only the command of the search and rescue center is responded;
step 2, if the rescue wireless communication terminal in danger fails to establish contact with the search and rescue center, the rescue wireless communication terminal in danger is only in a receiving mode, the Beidou positioning module RNSS is started to perform positioning, but does not send positioning information, and if search information of the search and rescue center is received and contact is established with the search and rescue center in the process, the rescue wireless communication terminal enters a response receiving mode and only responds to a command of the search and rescue center;
and 3, after the emergency rescue wireless communication terminal receives the search information of the search and rescue center and establishes contact with the search and rescue center, the search and rescue center positions the emergency rescue wireless communication terminal according to the positioning information sent by the emergency rescue wireless communication terminal, and then the distance between the search and rescue center and the emergency rescue wireless communication terminal is judged to obtain the distance between the search and rescue center and the emergency rescue wireless communication terminal, so that the emergency personnel are rescued.
Preferably, in the low power consumption mode described in step 1, the implementation method is:
the FPGA module of the digital algorithm processing chip suspends the operation of a communication waveform algorithm, sends an instruction to control the radio frequency transceiver chip module to enter a sleep state, and outputs and turns off the radio frequency front-end module through an IO interface; the micro control chip module controls the Bluetooth module to enter a sleep state through an instruction, outputs and turns off the power supply of the Beidou positioning module RNSS through an IO interface, enters a low power consumption mode through controlling an internal register and only responds to a starting detection instruction;
preferably, the sleep/wake mechanism in step 1 is implemented by:
according to the working state of the micro control chip module, the FPGA module of the digital algorithm processing chip controls a communication link, controls the running state of a communication waveform algorithm, the working state of the radio frequency transceiver chip module and the power supply state of the radio frequency front end module, and realizes the working mechanism of dormancy awakening.
Preferably, the distance determination method in step 3 is:
the search and rescue center transmits a search information signal, and the rescue wireless communication terminal in distress transmits a response information signal with a self number after receiving the search information. The search and rescue center judges the distance between the search and rescue center and the lifesaving wireless communication terminal in danger by receiving the response information signal with the self number sent by the lifesaving wireless communication terminal in danger, so as to obtain the distance between the search and rescue center and the lifesaving wireless communication terminal in danger.
Compared with the prior art, the invention has the beneficial effects that:
the invention has the advantages that:
(1) the distress lifesaving wireless communication terminal utilizes a high-sensitivity communication waveform algorithm to support ground-to-air long-distance data transmission of more than 80 kilometers under the condition that the transmitting power is 0.8W, and the problem that the search and rescue coverage range is not large enough in the distress search and rescue process is solved greatly.
(2) The distress lifesaving wireless communication terminal has the distance measuring capability. The search and rescue center judges the distance between the search and rescue center and the rescue wireless communication terminal by receiving the specific electric wave sent by the distress rescue wireless communication terminal, solves the problem that the search and rescue method only depends on a single search and rescue mode of Beidou or GPS positioning information, and strengthens the positioning capability of real-time search and rescue.
(3) The terminal designs a set of search response dormancy awakening mechanism based on a chip highly programmable technology, can greatly reduce average power consumption during working under the condition of not influencing the success rate of search and rescue, reduces the using amount of power supply materials, and greatly reduces the volume and weight of the whole terminal, so that the terminal is suitable for being carried about and has good application environment applicability.
Drawings
The invention is described in further detail below with reference to the figures and specific embodiments.
Fig. 1 is an architecture diagram of an internal circuit of a distress lifesaving wireless communication terminal of the invention;
FIG. 2 is a communication waveform transmission algorithm architecture diagram of the present invention;
FIG. 3 is a communication waveform reception algorithm architecture of the present invention;
FIG. 4 is a flow chart of the operation of the emergency lifesaving wireless communication terminal of the invention;
FIG. 5 is a timing diagram illustrating the backhaul process of the present invention;
FIG. 6 is a low power mode state diagram of the present invention;
FIG. 7 is a sleep wake-up mechanism diagram of the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention.
Referring to fig. 1, an architecture diagram of an internal circuit of a distress life-saving wireless communication terminal of the present invention includes a power supply unit and an internal circuit unit.
(1) The power supply unit is used for supplying power to the internal circuit module, and is used for triggering startup management and manual startup in a soaking mode;
the power supply unit comprises a lithium battery pack and a power supply management module,
the lithium battery pack is used for supplying power to the internal circuit module;
the power management module is used for manually triggering startup management and soaking to trigger startup management;
(2) the internal circuit unit comprises a Beidou positioning module, a water immersion detection circuit module, a micro control chip module, a digital algorithm processing chip FPGA module, a radio frequency transceiving chip module and a radio frequency front end module;
the Beidou positioning module is used for providing positioning information of the terminal;
the immersion detection circuit module is used for providing an immersion alarm signal of the terminal;
the micro-control chip module is used for receiving the flooding alarm signal provided by the flooding detection circuit module, transmitting the flooding alarm signal to the power supply unit, starting flooding by the power supply unit to trigger starting management, and starting a flooding life-saving working process by using positioning information provided by the Beidou positioning module; the system comprises a power supply unit, a Beidou positioning module, a power supply unit and a power supply unit, wherein the power supply unit is used for receiving a manual trigger starting signal of the power supply unit and starting an active distress lifesaving working process by utilizing positioning information provided by the Beidou positioning module; the system is used for outputting a distress signal with positioning information;
the digital algorithm processing chip FPGA module is used for receiving the search information digital signal output by the radio frequency transceiver chip module; the system comprises a micro-control chip module, a positioning module and a control module, wherein the micro-control chip module is used for receiving a distress signal with positioning information output by the micro-control chip module and generating an audio alarm signal;
the method is used for carrying out a high-sensitivity communication waveform algorithm, and improves the sensitivity of various signals:
sequentially carrying out convolutional coding, framing, spread spectrum and BPSK modulation algorithm processing on a data signal to be transmitted to generate a baseband signal; carrying out BPSK demodulation, frame capture, code tracking, carrier synchronization, despreading, Viterbi decoding and synchronous code detection algorithm processing on the received search information digital signal in sequence to generate a response information signal with a self number;
the radio frequency transceiving chip module is used for receiving the baseband signal output by the FPGA module of the digital algorithm processing chip, performing digital-to-analog conversion, frequency mixing and filtering processing on the baseband signal and generating a transmitting signal; the system comprises a radio frequency front end, a frequency mixing unit and a filter unit, wherein the radio frequency front end is used for receiving a search information signal output by the radio frequency front end, and performing analog-to-digital conversion, frequency mixing and filtering processing on the search information signal to generate a search information digital signal;
the radio frequency front end module is used for receiving the transmitting signal output by the radio frequency receiving chip transmitting module, amplifying the power of the transmitting signal and transmitting the transmitting signal through an antenna; the radio frequency transceiver module is used for receiving a search information signal sent by the search and rescue center, amplifying the power of the search information signal and outputting the search information signal to the radio frequency transceiver module.
Preferably, the distress lifesaving wireless communication terminal further comprises a Bluetooth module, and the Bluetooth module sends the information of the distress person to a search and rescue center through an SOS key.
Specifically, when carrying the bluetooth equipment that physiological sign gathered monitoring on the victim, bluetooth module received its information to send it to the search and rescue center through the SOS button. After the micro-control chip detects the SOS key signal, the physiological sign information is sent to the digital algorithm processing chip FPGA module through a serial port instruction at a certain moment according to the distress flow management, the digital algorithm processing chip FPGA module uses a designed communication waveform algorithm to process the positioning information and then sends the positioning information to the radio frequency transceiving chip module, the digital signal is converted into an analog signal after DA (digital-to-analog) conversion, filtering and frequency mixing processing, and the analog signal is transmitted out through the ultrashort wave life-saving antenna module after the power amplification processing is carried out on the digital signal through the radio frequency front-end module.
Preferably, the distress lifesaving wireless communication terminal further comprises a Flash module.
The micro-control chip module in the internal circuit module adopts a low-power consumption micro-control chip STM32, and the control software function is realized through a low-power consumption micro-control chip STM 32;
specifically, the low-power consumption micro control chip STM32 mainly comprises the following functions: parameter injection, state management, interface management and flow control.
And (3) parameter injection: after power-on, the first step is to inject the configuration parameters (working frequency, terminal ID number, adjustable crystal oscillator voltage parameters) into the running program, and the specific implementation process is as follows: the micro control chip reads parameter data from an external Flash module, and injects working frequency and ID number into FPGA module software of a digital algorithm processing chip through a UART asynchronous serial port, and injects adjustable crystal oscillator voltage parameter into a digital voltage conversion DA through an SPI serial port;
and (3) state management: the micro control chip manages various states of the emergency lifesaving wireless communication terminal. The method comprises the following steps: charging management, standby management, startup work management and search and rescue success indication management;
interface management: the micro control chip efficiently schedules data through managing the Beidou module, the Bluetooth module, the Flash module and the FPGA module interface of the digital algorithm processing chip;
and (3) flow control: and managing the working process of the emergency lifesaving wireless communication terminal after the emergency lifesaving wireless communication terminal is started.
The immersion detection circuit module adopts an extremely low power consumption resistance value comparator TLV7031DCKR-PDSO-G5, and is used for outputting immersion alarm signals when the resistance value of the comparator changes in the immersion state, and the micro control chip module controls the power tube circuit to electrify all parts after receiving the alarm signals, so that the life-saving terminal in danger is started to work;
the transmission performance of different communication waveform algorithms is different, and the wireless communication terminal for life saving in distress transmits a small amount of data each time, namely the data bandwidth is low, but the wireless communication terminal has the capability of long-distance transmission, namely the receiving sensitivity is high.
The high-sensitivity communication waveform algorithm of the FPGA module of the digital algorithm processing chip comprises the following steps: sequentially carrying out convolutional coding, framing, spread spectrum and BPSK modulation algorithm processing on a data signal to be transmitted to generate a baseband signal; carrying out BPSK demodulation, frame capture, code tracking, carrier synchronization, despreading, Viterbi decoding and synchronous code detection algorithm processing on the received search information digital signal in sequence to generate a response information signal with a self number;
specifically, as shown in fig. 2, in the FPGA module of the digital algorithm processing chip, a data signal to be transmitted is sequentially processed through convolution coding, framing, spreading, and BPSK modulation algorithms to generate a baseband signal;
convolution coding is carried out on a data signal to be transmitted, and error codes generated due to interference are corrected, so that the error code rate is reduced, and the sensitivity is improved. Framing the signal after convolutional coding, performing spread spectrum processing on the symbol after framing, expanding the original signal spectrum into a wider spectrum, and finally performing data modulation on the change of the phase of the signal through Binary Phase Shift Keying (BPSK) control to realize data signal transmission. In this embodiment, the direct sequence spread spectrum method is used for the spread spectrum.
Specifically, as shown in fig. 3, in the FPGA module, a digital signal to be received is sequentially subjected to BPSK demodulation, frame capture, code tracking, carrier synchronization, despreading, Viterbi decoding, and synchronous code detection algorithm processing, so as to generate a response information signal with its own number;
after receiving the search information digital signal, Binary Phase Shift Keying (BPSK) demodulates the phase of the signal and captures the frame. The frame capture carries out capture judgment on the effective data signal, code tracking is carried out after the judgment is successful, and the code tracking positions each frame header of the signal to prevent errors from occurring in the subsequent processing position. Then carrying out carrier synchronization to carry out synchronization processing on the carrier frequency shift, then carrying out de-spreading processing on the carrier frequency shift in a receiving algorithm framework, and then carrying out Viterbi decoding and synchronous code detection to generate a response information signal with a self number;
the Beidou positioning module RNSS is used for acquiring positioning information, and the implementation method comprises the following steps:
after the lifesaving wireless communication terminal is started, the Beidou positioning module RNSS is started to send positioning information to the micro control chip module, the micro control chip module sends the positioning information to the digital algorithm processing chip FPGA module, the digital algorithm processing chip FPGA module processes the positioning information and then sends the positioning information to the radio frequency transceiving chip module, the radio frequency transceiving chip module converts digital signals into analog signals, and the analog signals are transmitted out through the ultrashort wave lifesaving antenna module after being subjected to power amplification processing through the radio frequency front end module.
Specifically, after the distress lifesaving wireless communication terminal is started, the Beidou positioning module RNSS is started, positioning information (longitude and latitude information) is acquired once per minute through a Beidou satellite, then the current positioning information is sent to the micro-control chip, the micro-control chip sends the positioning information to the digital algorithm processing chip FPGA module through a serial port instruction at a certain moment according to distress flow management, the digital algorithm processing chip FPGA module processes the positioning information by using a designed communication waveform algorithm and then sends the positioning information to the radio frequency transceiving chip module, and the positioning information is subjected to DA (digital to analog) conversion, filtering and frequency mixing processing, then the digital signal is converted into an analog signal, and the analog signal is transmitted out through the ultrashort wave lifesaving antenna module after power amplification processing is carried out through the radio frequency front-end module.
Preferably, the digital algorithm processing chip FPGA module generates the audio alarm signal, and is implemented by the following method:
an amplitude modulation AM alarm signal with specific sound effect is designed, the rescue wireless communication terminal in danger emits the signal at intervals when in danger, and the search and rescue center can demodulate and play the received signal through the amplitude modulation AM and hear the alarm sound intuitively.
Specifically, the design method comprises the steps that a specific audio amplitude modulation AM data source is stored in a ROM inside a digital algorithm processing chip FPGA module, when the digital algorithm processing chip FPGA module receives an alarm instruction of a micro-control chip, the audio amplitude modulation AM data are sent to a radio frequency transceiving chip module in a circulating mode, digital signals are converted into analog signals after DA (digital-to-analog) conversion, filtering and frequency mixing processing, and the analog signals are transmitted out through an ultrashort wave lifesaving antenna module after power amplification processing is carried out on the digital signals through a radio frequency front end module.
Referring to fig. 4, a flowchart of a wireless communication terminal for life saving in distress according to the present invention is shown, which illustrates a method for searching for life saving based on a wireless communication terminal for life saving in distress according to the present invention, and the method comprises the following steps:
step 1, when the distress lifesaving wireless communication terminal is not started, the distress lifesaving wireless communication terminal is in a low power consumption mode; after the emergency lifesaving wireless communication terminal is manually started or is triggered to be started after being soaked in water, the Beidou positioning module RNSS is started to position, the emergency lifesaving wireless communication terminal transmits a distress signal with positioning information, a dormancy awakening mechanism is started, the working state and the dormancy state are continuously switched when the emergency lifesaving wireless communication terminal receives the distress signal, and meanwhile, an audio alarm signal is transmitted; if the search information of the search and rescue center is received in the process, after the search and rescue center is contacted, entering a response receiving mode, and only responding to a command of the search and rescue center;
when the emergency lifesaving wireless communication terminal is not manually started or is started after being soaked in water, the emergency lifesaving wireless communication terminal is in a low power consumption mode; after the emergency lifesaving wireless communication terminal is manually started or is triggered to be started after being soaked in water, the Beidou positioning module RNSS is started, position information is acquired once every minute, the starting time is 24 hours, and the positioning is carried out 1440 times in total. After each positioning, the lifesaving wireless communication terminal in danger transmits a lifesaving signal once (containing current positioning information), and after the lifesaving signal is transmitted, the lifesaving wireless communication terminal in danger continuously switches between a receiving working state and a dormant state according to a certain time ratio, and simultaneously transmits an audio alarm signal once every 3 minutes, wherein the time length of each time is 8 seconds. If the search information of the search and rescue center is received in the process, after the search and rescue center is connected, the working process is ended, and the response receiving mode is entered, namely, only the search and rescue center command is responded, wherein the response receiving mode comprises the steps of returning the ID number of the terminal, positioning information, sending a distance test signal and uploading physiological signs.
The further improvement of the scheme is that in the low power consumption mode described in step 1, the implementation method is as follows:
the FPGA module of the digital algorithm processing chip suspends the operation of a communication waveform algorithm, controls the radio frequency transceiver chip module to enter a sleep state by sending an instruction, and switches off the radio frequency front-end module by the output of an IO interface; the micro control chip module controls the Bluetooth module to enter a sleep state through an instruction, outputs and turns off power supply of the Beidou positioning module RNSS through the IO interface, and only responds to a starting detection instruction by controlling the internal register to enter a low power consumption mode.
Specifically, as shown in fig. 6, in the low power consumption mode, the FPGA module suspends the operation of the communication waveform algorithm, controls the rf transceiver chip module to enter a sleep state by sending an instruction, and outputs and turns off the rf front-end module through the IO interface; the micro control chip module controls the Bluetooth module to enter a sleep state through an instruction, outputs and turns off power supply of the Beidou positioning module RNSS through the IO interface, and only responds to a starting detection instruction by controlling the internal register to enter a low power consumption mode. The distress lifesaving wireless communication terminal enters a low power consumption mode, the power consumption is less than 40mW, and the low power consumption mode is similar to a super power saving mode of a mobile phone.
The further improvement of the scheme is that the implementation method of the dormancy wakeup mechanism in step 1 is as follows:
according to the working state of the micro control chip module, the FPGA module of the digital algorithm processing chip controls a communication link, controls the running state of a communication waveform algorithm, the working state of the radio frequency transceiver chip module and the power supply state of the radio frequency front end module, and realizes the working mechanism of dormancy awakening.
In the actual search and rescue process, the emergency rescue wireless communication terminal does not need to report position information, send an Amplitude Modulation (AM) alarm signal or be in a receiving state at all times, and only needs to acquire a search and rescue center signal within a reasonable time interval. If the wireless communication terminal enters the dormant state in the time period of not sending information so as to reduce the power consumption to the minimum, the whole working time can be greatly prolonged.
Specifically, as shown in fig. 7, the sleep/wake-up mechanism is a working mechanism for a communication link controlled by the FPGA module of the digital algorithm processing chip, where the micro control chip module needs to work normally in a working state at this time, and the FPGA module of the digital algorithm processing chip controls a running state of a communication waveform algorithm, a working state of the rf transceiver chip module, and a power supply state of the rf front-end module, so as to implement sleep/wake-up of the digital algorithm processing chip. When the distress life-saving terminal works, the communication link part occupies most of power consumption, so that the average power consumption can be greatly reduced through a dormancy awakening mechanism, and the working time is prolonged.
Specifically, the wireless communication system enters a dormant state and is kept for a period of time, then the power level is pulled up through an IO interface to be output, power is supplied to a radio frequency front end module, a command is sent to control the radio frequency transceiver chip module to enter a wakeup state, the radio frequency transceiver chip module enters a working state, a communication waveform algorithm is started to run, and the wireless communication system enters the wakeup state to complete work. The cycle of the sleep-wake mechanism is completed.
Step 2, if the rescue wireless communication terminal in danger fails to establish contact with the search and rescue center, the rescue wireless communication terminal in danger is only in a receiving mode, the Beidou positioning module RNSS is started to perform positioning, but does not send positioning information, and if search information of the search and rescue center is received and contact is established with the search and rescue center in the process, the rescue wireless communication terminal enters a response receiving mode and only responds to a command of the search and rescue center;
specifically, if the distress life-saving wireless communication terminal fails to establish contact with the search and rescue center within 24 hours, the distress life-saving wireless communication terminal is only in a receiving mode, the Beidou positioning module RNSS is continuously started for positioning, and position information is acquired once every minute and is not transmitted. If the search information of the search and rescue center is received in the process, after the search and rescue center is connected, the working process is ended, and the response receiving mode is entered, namely, only the search and rescue center command is responded, wherein the response receiving mode comprises the steps of returning the ID number of the terminal, positioning information, sending a distance test signal and uploading physiological signs.
And 3, after the emergency rescue wireless communication terminal receives the search information of the search and rescue center and establishes contact with the search and rescue center, the search and rescue center positions the emergency rescue wireless communication terminal according to the positioning information sent by the emergency rescue wireless communication terminal, and then the distance between the search and rescue wireless communication terminal and the emergency rescue wireless communication terminal is judged to obtain the distance between the search and rescue center and the emergency rescue wireless communication terminal, so that the emergency personnel are rescued.
In a further improvement of the present invention, the distance determination method in step 3 is:
the search and rescue center transmits the search information signal, and the rescue wireless communication terminal in distress transmits a response information signal with a self number after receiving the search information signal. The search and rescue center judges the distance between the search and rescue center and the lifesaving wireless communication terminal in danger by receiving the response information signal with the self number sent by the lifesaving wireless communication terminal in danger, so as to obtain the distance between the search and rescue center and the lifesaving wireless communication terminal in danger.
Specifically, the search and rescue center sends out a search information signal by interval polling during search and rescue, and the rescue wireless communication terminal in distress receives the search information signal and timely responds to the search information signal to send out a response information signal with a self number.
As shown in fig. 5, in one polling response process, the search and rescue center processes the signal processing time T1 and the space propagation time T2, and in the distress rescue wireless communication terminal, the radio frequency front end module receiving time T3, the radio frequency chip module receiving time T4, the digital algorithm processing chip FPGA module processing time T5, the radio frequency chip module transmitting time T6, the radio frequency front end module transmitting time T7, the space propagation time T8 and the received signal processing time T9 are passed.
The total time required is T, which is obtained by recording by a timer of the search and rescue center (starting timing when the search and rescue center sends out a signal, and the total time until the moment when the received signal is processed), and T is T1+ T2+ T3+ T4+ T5+ T6+ T7+ T8+ T9. Wherein, T1, T3, T4, T5, T6, T7 and T9 are obtained by testing, and belong to known parameters, and the unknown time is only T2 and T8.
Since the radio wave has a propagation speed of 3 x 10 in the air8m/s, and the time for completing one inquiry response process is short, the distance between the rescue wireless communication terminal and the search and rescue center in the distress is considered to be constant in the time period, so that T2 and T8 can be considered to be equal. This gives the value of time T2, multiplied by 3 x 108Life saving by calculating danger in m/sThe distance d is between the wireless communication terminal and the search and rescue center.
The distance d is calculated by the formula:
d＝T2*3*108m/s＝0.5*(T-(T1+T3+T4+T5+T6+T7+T9))*3*108m
although the present invention has been described in detail in this specification with reference to specific embodiments and illustrative embodiments, it will be apparent to those skilled in the art that modifications and improvements can be made thereto based on the present invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (8)
1. The utility model provides a lifesaving wireless communication terminal in distress, includes power supply unit, internal circuit unit, its characterized in that:
(1) the power supply unit is used for supplying power to the internal circuit module, triggering startup management by soaking and manually triggering startup;
the power supply unit comprises a lithium battery pack and a power supply management module,
the lithium battery pack is used for supplying power to the internal circuit module;
the power management module is used for manually triggering startup management and soaking to trigger startup management;
(2) the internal circuit unit comprises a Beidou positioning module, a water immersion detection circuit module, a micro control chip module, a digital algorithm processing chip FPGA module, a radio frequency transceiving chip module and a radio frequency front end module;
the Beidou positioning module is used for providing positioning information of the terminal;
the immersion detection circuit module is used for providing an immersion alarm signal of the terminal;
the micro-control chip module is used for receiving the flooding alarm signal provided by the flooding detection circuit module, transmitting the flooding alarm signal to the power supply unit, starting flooding by the power supply unit to trigger starting management, and starting a flooding life-saving working process by using positioning information provided by the Beidou positioning module; the system comprises a power supply unit, a Beidou positioning module, a power supply unit and a power supply unit, wherein the power supply unit is used for receiving a manual trigger starting signal of the power supply unit and starting an active distress life-saving working process by utilizing positioning information provided by the Beidou positioning module; the system is used for outputting a distress signal with positioning information;
the digital algorithm processing chip FPGA module is used for receiving the search information digital signal output by the radio frequency transceiver chip module; the system comprises a micro-control chip module, a positioning module and a control module, wherein the micro-control chip module is used for receiving a distress signal with positioning information output by the micro-control chip module and generating an audio alarm signal; the method is used for carrying out a high-sensitivity communication waveform algorithm, and improves the sensitivity of various signals: sequentially carrying out convolutional coding, framing, spread spectrum and BPSK modulation algorithm processing on a data signal to be transmitted to generate a baseband signal; carrying out BPSK demodulation, frame capture, code tracking, carrier synchronization, despreading, Viterbi decoding and synchronous code detection algorithm processing on the received search information digital signal in sequence to generate a response information signal with a self number;
the radio frequency transceiving chip module is used for receiving the baseband signal output by the FPGA module of the digital algorithm processing chip, performing digital-to-analog conversion, frequency mixing and filtering processing on the baseband signal and generating a transmitting signal; the system comprises a radio frequency front end, a frequency mixing unit and a filter unit, wherein the radio frequency front end is used for receiving a search information signal output by the radio frequency front end, and performing analog-to-digital conversion, frequency mixing and filtering processing on the search information signal to generate a search information digital signal;
the radio frequency front end module is used for receiving the transmitting signal output by the radio frequency receiving chip transmitting module, amplifying the power of the transmitting signal and transmitting the transmitting signal through an antenna; the radio frequency transceiver module is used for receiving a search information signal sent by the search and rescue center, amplifying the power of the search information signal and outputting the search information signal to the radio frequency transceiver module.
2. The distress rescue wireless communication terminal of claim 1, further comprising a Bluetooth module, wherein the Bluetooth module sends information of a victim to the search and rescue center through an SOS key.
3. A distress rescue wireless communication terminal as claimed in claim 1, wherein the distress rescue wireless communication terminal further comprises a Flash module.
4. A distress rescue wireless communication terminal as claimed in claim 1, wherein the digital algorithm processing chip FPGA module generates the audio alarm signal by the following method:
an amplitude modulation AM alarm signal with specific sound effect is designed, the rescue wireless communication terminal in danger emits the signal at intervals when in danger, and the search and rescue center can demodulate and play the received signal through the amplitude modulation AM and hear the alarm sound intuitively.
5. A lifesaving search method based on a distress lifesaving wireless communication terminal is characterized by comprising the following steps:
step 1, when the distress lifesaving wireless communication terminal is not started, the distress lifesaving wireless communication terminal is in a low power consumption mode; after the emergency lifesaving wireless communication terminal is manually started or is triggered to be started after being soaked in water, the Beidou positioning module RNSS is started to position, the emergency lifesaving wireless communication terminal transmits a distress signal with positioning information, a dormancy awakening mechanism is started, the working state and the dormancy state are continuously switched when the emergency lifesaving wireless communication terminal receives the distress signal, and meanwhile, an audio alarm signal is transmitted; if a search information signal of the search and rescue center is received in the process, after the search and rescue center is connected, a response receiving mode is entered, and only a search and rescue center command is responded;
step 2, if the rescue wireless communication terminal in danger fails to establish contact with the search and rescue center, the rescue wireless communication terminal in danger is only in a receiving mode, the Beidou positioning module RNSS is started to perform positioning, but does not send positioning information, and if a search information signal of the search and rescue center is received and contact is established with the search and rescue center in the process, the rescue wireless communication terminal enters a response receiving mode and only responds to a search and rescue center command;
and 3, after the emergency rescue wireless communication terminal receives the search information signal of the search and rescue center and establishes contact with the search and rescue center, the search and rescue center positions the emergency rescue wireless communication terminal according to the positioning information sent by the emergency rescue wireless communication terminal, and the distance between the search and rescue wireless communication terminal and the emergency rescue wireless communication terminal is judged to obtain the distance between the search and rescue center and the emergency rescue wireless communication terminal, so that the emergency personnel are rescued.
6. The rescue search method based on the rescue wireless communication terminal from distress as claimed in claim 5, wherein the low power consumption mode is:
the FPGA module of the digital algorithm processing chip suspends the operation of a communication waveform algorithm, sends an instruction to control the RF transceiver chip module to enter a sleep state, and outputs and turns off the RF front-end module through an IO interface; the micro control chip module controls the Bluetooth module to enter a sleep state through an instruction, outputs and turns off power supply of the Beidou positioning module RNSS through the IO interface, and only responds to a starting detection instruction by controlling the internal register to enter a low power consumption mode.
7. The rescue search method based on the rescue wireless communication terminal from distress as claimed in claim 5, wherein the sleep wake-up mechanism is:
according to the working state of the micro control chip module, the FPGA module of the digital algorithm processing chip controls a communication link, controls the running state of a communication waveform algorithm, the working state of the radio frequency transceiver chip module and the power supply state of the radio frequency front end module, and realizes the working mechanism of dormancy awakening.
8. The rescue search method based on the rescue wireless communication terminal in distress as claimed in claim 5, wherein the distance determination method comprises:
the search and rescue center transmits a search information signal, the rescue wireless communication terminal in danger transmits a response information signal with a self number after receiving the search information signal, and the search and rescue center judges the distance between the search and rescue center and the rescue wireless communication terminal in danger by receiving the response information signal with the self number transmitted by the rescue wireless communication terminal in danger to obtain the distance between the search and rescue center and the rescue wireless communication terminal in danger.
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