CN114531744B - Distress lifesaving wireless communication terminal and lifesaving searching method thereof - Google Patents
Distress lifesaving wireless communication terminal and lifesaving searching method thereof Download PDFInfo
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- 238000004891 communication Methods 0.000 title claims abstract description 135
- 230000009429 distress Effects 0.000 title claims abstract description 125
- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000012545 processing Methods 0.000 claims abstract description 61
- 238000001514 detection method Methods 0.000 claims abstract description 21
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 7
- 238000002791 soaking Methods 0.000 claims abstract description 5
- 238000007654 immersion Methods 0.000 claims description 34
- 230000004044 response Effects 0.000 claims description 24
- 230000008569 process Effects 0.000 claims description 18
- 230000007246 mechanism Effects 0.000 claims description 15
- 230000007958 sleep Effects 0.000 claims description 14
- 230000005059 dormancy Effects 0.000 claims description 11
- 238000006243 chemical reaction Methods 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 238000001914 filtration Methods 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 9
- 238000001228 spectrum Methods 0.000 claims description 9
- 238000009432 framing Methods 0.000 claims description 7
- 230000001360 synchronised effect Effects 0.000 claims description 6
- 230000035945 sensitivity Effects 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 description 10
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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
-
- 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
-
- 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]
-
- 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
-
- 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)
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- Environmental & Geological Engineering (AREA)
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Abstract
The utility model 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, and 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 soaking detection circuit module, a micro control chip module, a digital algorithm processing chip FPGA module, a radio frequency transceiver chip module and a radio frequency front end module. After the distress rescue wireless communication terminal is started, a distress rescue workflow is started, distress signals with positioning information are output, and a search and rescue center transmits the signals of the search information. After the distress life-saving wireless communication terminal establishes contact with the search and rescue center, the search and rescue center obtains the position and distance information of the distress life-saving wireless communication terminal, and the rescue is unfolded. The utility model can realize remote communication, has large search and rescue coverage area, real-time search and rescue positioning capability, small volume, light weight and good application environment applicability.
Description
Technical Field
The utility model relates to the field of communication equipment, in particular to a distress lifesaving wireless communication terminal and a lifesaving searching method thereof.
Background
With the increase of global activities of human beings, various sudden distress events, such as distress in the air, distress in fishing vessels, distress in wild exploration, distress in geological disasters, etc., have also increased. When a distress situation occurs, if a victim can send a specific distress signal to the outside, the search and rescue person can quickly, accurately and effectively carry out rescue actions by acquiring the distress signal.
Currently, the international general radio life-saving method is to locate the distress device through satellites and forward the location information of the distress device to the ground station. Generally, aircraft and ships are basically provided with internationally-used radio distress devices, and the devices are large in size and high in price.
The seven-six research institute of Qingdao Jieli Automation Limited and China Ship heavy industry group company discloses an 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 arranged 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 to all module loads, and after the control module detects an alarm signal, the positioning communication device is started to receive Beidou positioning information, sends the position information to the search and rescue center and receives a feedback signal sent by the search and rescue center. 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 distress life-saving communication terminal has imperfect functions and obvious defects. Firstly, the wireless data transmission part in the existing distress life-saving communication terminal adopts a common data transmission module or device in the market, is not specially developed for remote search and rescue, has limited transmission distance, and is difficult to realize remote communication, so that the search and rescue coverage area is smaller, and the success rate of search and rescue is directly influenced. Secondly, the existing distress life-saving communication terminal is single in positioning mode, and lacks auxiliary means, the Beidou or GPS positioning information is transmitted to a search and rescue center, the search and rescue center positions the specific position of a victim through the received Beidou or GPS information, and once the distress life-saving terminal cannot obtain the Beidou or GPS positioning information, positioning search and rescue cannot be performed thoroughly. And in addition, the power consumption of the marine buoy type equipment or the ground handheld type equipment is high at present, and in order to prolong the working time, the power supply material is added, so that the device is large in size and weight and is not easy to carry or install.
Disclosure of Invention
Aiming at the problems existing in the prior art, the utility model aims to provide a distress lifesaving wireless communication terminal and a lifesaving searching method thereof, wherein the distress lifesaving wireless communication terminal can realize long-distance communication, has large search and rescue coverage area, has real-time search and rescue positioning capability, is small in size and light in weight, is suitable for being carried about, and has good application environment applicability.
In order to achieve the above purpose, the present utility model is realized by the following technical scheme.
The utility model provides a wireless communication terminal of lifesaving 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 water immersion triggering starting management and manual triggering starting;
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 the starting management and soaking the starting 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 transceiver 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 immersion alarm signal provided by the immersion detection circuit module, transmitting the immersion alarm signal to the power supply unit, starting the immersion to trigger starting management by the power supply unit, and starting the immersion distress life-saving workflow by utilizing the positioning information provided by the Beidou positioning module; the power unit is used for receiving a manual triggering start-up signal of the power unit, and starting an active distress life-saving workflow 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 digital signal of the search information output by the radio frequency receiving and transmitting chip module; the system comprises a micro control chip module, a positioning information acquisition module, a voice frequency alarm module and a voice frequency alarm 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 improving the sensitivity of various signals: the data signal to be transmitted is processed by convolution coding, framing, spread spectrum and BPSK modulation algorithm in sequence to generate a baseband signal; sequentially performing BPSK demodulation, frame capturing, code tracking, carrier synchronization, despreading, viterbi decoding and synchronous code detection algorithm processing on the received digital signal of the search information to generate a response information signal with own number;
the radio frequency receiving and transmitting chip module is used for receiving the baseband signal output by the digital algorithm processing chip FPGA module, performing digital-to-analog conversion, frequency mixing and filtering processing on the baseband signal and generating a transmitting signal; the digital signal processing device is used for receiving the search information signal output by the radio frequency front end, performing analog-to-digital conversion, mixing and filtering processing on the search information signal, and generating 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 the antenna; the system is used for receiving the search information signal sent by the search and rescue center, amplifying the power of the search information signal and outputting the power to the radio frequency transceiver module.
Preferably, the distress life-saving wireless communication terminal further comprises a Bluetooth module, and the Bluetooth module sends the distress information to the search and rescue center through an SOS key.
Preferably, the distress life-saving wireless communication terminal further comprises a Flash module.
Preferably, the digital algorithm processing chip FPGA module generates the audio alarm signal by the following method:
the amplitude modulation AM alarm signal with specific sound effect is designed, the wireless communication terminal for life saving in danger transmits the signal at intervals, and the search and rescue center can demodulate the received signal through the amplitude modulation AM and play the signal, so that the alarm sound can be intuitively heard.
The utility model provides a life-saving searching method based on a distress life-saving wireless communication terminal, which is characterized by comprising the following steps:
step 1, when a life-saving wireless communication terminal in distress is not started, the life-saving wireless communication terminal is in a low-power consumption mode; after the distress lifesaving wireless communication terminal is started manually or started by water immersion triggering, the Beidou positioning module RNSS is started to position, the distress lifesaving wireless communication terminal transmits a distress signal with positioning information, a dormancy awakening mechanism is started, the receiving working state and the dormancy state are continuously switched, and simultaneously, an audio alarm signal is transmitted; if search information of the search and rescue center is received in the process, after establishing contact with the search and rescue center, entering a response receiving mode, and only responding to a search and rescue center command;
step 2, if the distress life-saving wireless communication terminal fails to establish contact with the search and rescue center, the distress life-saving wireless communication terminal is only in a receiving mode, the Beidou positioning module RNSS is started to perform positioning, but does not send positioning information, if search information of the search and rescue center is received in the process, the distress life-saving wireless communication terminal establishes contact with the search and rescue center, and then enters a response receiving mode and only responds to a search and rescue center command;
and 3, the distress lifesaving wireless communication terminal receives search information of the search and rescue center, after establishing contact with the search and rescue center, the search and rescue center positions the distress lifesaving wireless communication terminal according to positioning information sent by the distress lifesaving wireless communication terminal, and then the distance between the two is judged to obtain the distance between the search and rescue center and the distress lifesaving wireless communication terminal, so that rescue personnel can be unfolded.
Preferably, the low power consumption mode described in step 1 is implemented by:
the digital algorithm processing chip FPGA module pauses the operation of the 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 the IO interface; the micro-control chip module controls the Bluetooth module to enter a sleep state through an instruction, turns off power supply of the Beidou positioning module RNSS through the IO interface output, and only responds to a start-up detection instruction through controlling the internal register to enter a low-power mode;
preferably, the sleep wake-up mechanism described in step 1 is implemented by:
according to the working state of the micro control chip module, the digital algorithm processing chip FPGA module 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 wakeup.
Preferably, the method for determining the distance in the step 3 is as follows:
the search and rescue center transmits a search information signal, and the distress rescue wireless communication terminal receives the search information and then transmits a response information signal with a self number. The search and rescue center judges the distance between the two through receiving the response information signal with the own number sent by the distress rescue wireless communication terminal, and the distance between the search and rescue center and the distress rescue wireless communication terminal is obtained.
Compared with the prior art, the utility model has the beneficial effects that:
the utility model has the advantages that:
(1) The distress life-saving wireless communication terminal utilizes a high-sensitivity communication waveform algorithm, supports the transmission of long-distance data over 80 km over the sky under the condition of the transmission power of 0.8W, and greatly solves the problem that the search and rescue coverage area is not large enough in the distress search and rescue process.
(2) The distress life-saving wireless communication terminal has the capability of ranging. The search and rescue center judges the distance between the two through receiving the specific electric waves sent by the distress lifesaving wireless communication terminal, solves the problem that a single search and rescue mode only can rely on Beidou or GPS positioning information, and strengthens the positioning capability of real-time search and rescue.
(3) The terminal designs a search response dormancy awakening mechanism based on a chip height programmable technology, can greatly reduce the average power consumption during working under the condition of not influencing the success rate of search and rescue, reduces the use 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 utility model will now be described in further detail with reference to the drawings and to specific examples.
Fig. 1 is a block diagram of the internal circuitry of the distress rescue wireless communications terminal of the present utility model;
FIG. 2 is a schematic diagram of a communication waveform transmission algorithm of the present utility model;
FIG. 3 is a communication waveform receiving algorithm architecture of the present utility model;
FIG. 4 is a flowchart of the distress rescue wireless communications terminal of the present utility model;
FIG. 5 is a diagram illustrating the time of the backhaul process of the present utility model;
FIG. 6 is a low power mode state diagram of the present utility model;
FIG. 7 is a diagram of a sleep wakeup mechanism of the present utility model.
Detailed Description
Embodiments of the present utility model 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 for illustrating the present utility model and should not be construed as limiting the scope of the present utility model.
Referring to fig. 1, an architecture diagram of an internal circuit of a distress rescue wireless communication terminal according to the present utility model 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 water immersion triggering starting management and manual triggering starting;
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 the starting management and soaking the starting 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 transceiver 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 immersion alarm signal provided by the immersion detection circuit module, transmitting the immersion alarm signal to the power supply unit, starting the immersion to trigger starting management by the power supply unit, and starting the immersion distress life-saving workflow by utilizing the positioning information provided by the Beidou positioning module; the power unit is used for receiving a manual triggering start-up signal of the power unit, and starting an active distress life-saving workflow 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 digital signal of the search information output by the radio frequency receiving and transmitting chip module; the system comprises a micro control chip module, a positioning information acquisition module, a voice frequency alarm module and a voice frequency alarm 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 improving the sensitivity of various signals:
the data signal to be transmitted is processed by convolution coding, framing, spread spectrum and BPSK modulation algorithm in sequence to generate a baseband signal; sequentially performing BPSK demodulation, frame capturing, code tracking, carrier synchronization, despreading, viterbi decoding and synchronous code detection algorithm processing on the received digital signal of the search information to generate a response information signal with own number;
the radio frequency receiving and transmitting chip module is used for receiving the baseband signal output by the digital algorithm processing chip FPGA module, performing digital-to-analog conversion, frequency mixing and filtering processing on the baseband signal and generating a transmitting signal; the digital signal processing device is used for receiving the search information signal output by the radio frequency front end, performing analog-to-digital conversion, mixing and filtering processing on the search information signal, and generating 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 the antenna; the system is used for receiving the search information signal sent by the search and rescue center, amplifying the power of the search information signal and outputting the power to the radio frequency transceiver module.
Preferably, the distress life-saving wireless communication terminal further comprises a Bluetooth module, and the Bluetooth module sends the distress information to the search and rescue center through an SOS key.
Specifically, when carrying the bluetooth equipment of physiological sign collection monitoring on the person of meeting difficult person, bluetooth module receives its information to send it to search for and rescue center through SOS button. After detecting SOS key signals, the micro-control chip manages physiological sign information to a digital algorithm processing chip FPGA module at a certain moment through serial port instructions according to distress flow, the digital algorithm processing chip FPGA module processes positioning information through a designed communication waveform algorithm and then sends the positioning information to a radio frequency receiving and transmitting chip module, digital signals are changed into analog signals after DA (digital-to-analog) conversion, filtering and mixing processing, and the analog signals are transmitted through an ultrashort wave lifesaving antenna module after power amplification processing by a radio frequency front end module.
Preferably, the distress life-saving 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 the low-power-consumption micro control chip STM 32;
specifically, the main functions of the low-power micro-control chip STM32 include: parameter injection, state management, interface management, and flow control.
Parameter injection: after power-on, the first step is to inject configuration parameters (working frequency, terminal ID number, adjustable crystal oscillator voltage parameter) 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 the working frequency and ID number into the FPGA module software of the digital algorithm processing chip through a UART asynchronous serial port, and injects the adjustable crystal oscillator voltage parameter into the digital voltage conversion DA through an SPI serial port;
state management: the micro-control chip manages various states of the rescue wireless communication terminal. Comprising the following steps: charging management, standby management, startup work management and search and rescue success indication management;
interface management: the micro control chip efficiently performs scheduling among data by managing interfaces of the Beidou module, the Bluetooth module, the Flash module and the digital algorithm processing chip FPGA module;
and (3) flow control: and managing the working flow of the rescue wireless communication terminal after the rescue wireless communication terminal is started.
The immersion detection circuit module adopts a very low-power-consumption resistance comparator TLV7031DCKR-PDSO-G5, and is used for outputting an immersion alarm signal by changing the resistance of the comparator in an immersion state, and the micro-control chip module controls the power supply tube circuit to electrify all parts after receiving the alarm signal, so that the life-saving terminal in distress starts working state;
the transmission performance of different communication waveform algorithms is different, and the life-saving wireless communication terminal in distress has small data volume, namely, the data bandwidth is low, but has long-distance transmission capability, namely, the receiving sensitivity is high.
The digital algorithm processes a high-sensitivity communication waveform algorithm of a chip FPGA module, and comprises the following steps: the data signal to be transmitted is processed by convolution coding, framing, spread spectrum and BPSK modulation algorithm in sequence to generate a baseband signal; sequentially performing BPSK demodulation, frame capturing, code tracking, carrier synchronization, despreading, viterbi decoding and synchronous code detection algorithm processing on the received digital signal of the search information to generate a response information signal with own number;
specifically, as shown in fig. 2, in a digital algorithm processing chip FPGA module, a data signal to be transmitted is sequentially subjected to convolutional coding, framing, spread spectrum, and BPSK modulation algorithm processing to generate a baseband signal;
and carrying out convolutional coding on the data signals to be transmitted, and correcting error codes generated by interference so as to reduce the error rate and improve the sensitivity. Framing the signals after convolutional coding, performing spread spectrum processing on code elements after framing, spreading the original signal spectrum into a wider spectrum, and finally performing data modulation on the phase change of the signals by Binary Phase Shift Keying (BPSK) control to realize data signal transmission. In this embodiment, a direct sequence spread spectrum method is used for spreading.
Specifically, as shown in fig. 3, in the digital algorithm processing chip FPGA module, the digital signal of the seeking information to be received is sequentially processed by BPSK demodulation, frame capturing, code tracking, carrier synchronization, despreading, viterbi decoding, and synchronous code detection algorithm, so as to generate a response information signal with its own number;
after receiving the digital signal of the search information, binary Phase Shift Keying (BPSK) is used for demodulating the phase of the signal, and then frame capturing is carried out. The frame capturing carries out capturing judgment on the effective data signal, and after the judgment is successful, code tracking is carried out, the code tracking positions the frame head of each frame of the signal, and the error of the subsequent processing position is prevented. Then, carrier synchronization is carried out to carry out synchronization processing on carrier frequency shift, then despreading processing is carried out on the carrier frequency shift in a receiving algorithm architecture, viterbi decoding and synchronous code detection are carried out, and a response information signal with a self number is generated;
positioning information is acquired through the Beidou positioning module RNSS, and the implementation method comprises the following steps:
after the rescue wireless communication terminal is started, the Beidou positioning module RNSS starts 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 receiving and transmitting chip module, the radio frequency receiving and transmitting chip module converts digital signals into analog signals, and the analog signals are transmitted out through the ultrashort wave rescue antenna module after power amplification processing is carried out through the radio frequency front end module.
Specifically, after the distress life-saving wireless communication terminal is started, a Beidou positioning module RNSS is started, positioning information (longitude and latitude information) is acquired every minute through a Beidou satellite, then the current positioning information is sent to a micro-control chip, the micro-control chip manages the positioning information to be sent to a digital algorithm processing chip FPGA module through a serial port instruction at a certain moment according to a distress flow, the digital algorithm processing chip FPGA module processes the positioning information through a designed communication waveform algorithm and then sends the processed positioning information to a radio frequency receiving and transmitting chip module, and digital signals are changed into analog signals after DA (digital-analog) conversion, filtering and mixing processing, and then the analog signals are sent out through an ultrashort wave life-saving antenna module after power amplification processing through a radio frequency front end module.
Preferably, the digital algorithm processing chip FPGA module generates the audio alarm signal by the following method:
the amplitude modulation AM alarm signal with specific sound effect is designed, the wireless communication terminal for life saving in danger transmits the signal at intervals, and the search and rescue center can demodulate the received signal through the amplitude modulation AM and play the signal, so that the alarm sound can be intuitively heard.
The design method comprises the steps of storing a specific audio amplitude modulation AM data source in a ROM in a digital algorithm processing chip FPGA module, sending the audio amplitude modulation AM data to a radio frequency transceiver chip module in a circulating mode when the digital algorithm processing chip FPGA module receives an alarm instruction of a micro-control chip, converting the audio amplitude modulation AM data into an analog signal after DA (digital-to-analog) conversion, filtering and mixing, amplifying power by a radio frequency front end module, and transmitting the analog signal through an ultrashort wave lifesaving antenna module.
Referring to fig. 4, a working flow chart of a distress life-saving wireless communication terminal according to the present utility model is provided, which illustrates a life-saving searching method based on a distress life-saving wireless communication terminal according to the present utility model, and is characterized by comprising the following steps:
step 1, when a life-saving wireless communication terminal in distress is not started, the life-saving wireless communication terminal is in a low-power consumption mode; after the distress lifesaving wireless communication terminal is started manually or started by water immersion triggering, the Beidou positioning module RNSS is started to position, the distress lifesaving wireless communication terminal transmits a distress signal with positioning information, a dormancy awakening mechanism is started, the receiving working state and the dormancy state are continuously switched, and simultaneously, an audio alarm signal is transmitted; if search information of the search and rescue center is received in the process, after establishing contact with the search and rescue center, entering a response receiving mode, and only responding to a search and rescue center command;
when the distress lifesaving wireless communication terminal is not started manually or started in a water immersion mode, the distress lifesaving wireless communication terminal is in a low-power consumption mode; after the rescue wireless communication terminal in danger is started manually or started by water immersion triggering, the Beidou positioning module RNSS is started, position information is acquired once per minute, the starting time is 24 hours, and 1440 times of positioning are carried out. After each positioning, the distress life-saving wireless communication terminal transmits a life-saving signal once (containing the current positioning information), the distress life-saving wireless communication terminal is continuously switched between a receiving working state and a dormant state according to a certain time ratio, and simultaneously transmits an audio alarm signal every 3 minutes, wherein the time length of each time is 8 seconds. If search information of the search and rescue center is received in the process, after establishing contact with the search and rescue center, the working flow is ended, and a response receiving mode is entered, namely, only a search and rescue center command is responded, wherein the search and rescue center command comprises an ID number of a return terminal, positioning information, a transmission distance test signal and uploading physiological signs.
The scheme is further improved in that the low power consumption mode described in the step 1 is implemented by the following steps:
the digital algorithm processing chip FPGA module pauses the operation of the communication waveform algorithm, controls the radio frequency transceiver chip module to enter a sleep state by sending an instruction, and outputs and turns off the radio frequency front end module by the IO interface; the micro-control chip module controls the Bluetooth module to enter a sleep state through an instruction, turns off power supply of the Beidou positioning module RNSS through the IO interface output, and only responds to a start-up detection instruction through controlling the internal register to enter a low-power consumption mode.
Specifically, as shown in fig. 6, in the low power consumption mode, the digital algorithm processing chip FPGA module pauses the operation of the communication waveform algorithm, controls the radio frequency transceiver chip module to enter a sleep state by sending an instruction, and outputs and turns off the radio frequency front end module by the IO interface; the micro-control chip module controls the Bluetooth module to enter a sleep state through an instruction, turns off power supply of the Beidou positioning module RNSS through the IO interface output, and only responds to a start-up detection instruction through controlling the internal register to enter a low-power consumption mode. The life-saving wireless communication terminal in distress enters a low-power mode, the power consumption is less than 40mW, and the low-power mode is similar to a super power-saving mode of a mobile phone.
The scheme is further improved in that the dormancy wakeup mechanism in the step 1 is realized by the following steps:
according to the working state of the micro control chip module, the digital algorithm processing chip FPGA module 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 wakeup.
In the actual search and rescue process, the distress rescue wireless communication terminal does not need to report position information, send an Amplitude Modulation (AM) alarm signal or be in a receiving state every moment, and only needs to acquire a search and rescue center signal in a reasonable time interval. If the distress life-saving wireless communication terminal enters a dormant state in a time period when no information is sent, so that the power consumption is reduced to the minimum, the whole working time can be greatly prolonged.
Specifically, as shown in fig. 7, the sleep and wake-up mechanism is a working mechanism for implementing sleep and wake-up of the communication link controlled by the digital algorithm processing chip FPGA module, where the micro control chip module in a working state needs to work normally, and the digital algorithm processing chip FPGA module controls a communication waveform algorithm running state, a radio frequency transceiver chip module working state, and a radio frequency front end module power supply state. When the life-saving terminal in danger works, the communication link part occupies most of power consumption, so that the average power consumption of the life-saving terminal can be greatly reduced through a sleep awakening mechanism, and the working time is prolonged.
Specifically, the method comprises the steps of entering a dormant state and keeping the dormant state for a period of time, then pulling high-level output through an IO interface to supply power to a radio frequency front-end module, sending an instruction to control a radio frequency transceiver chip module to enter an awake state, enabling the radio frequency transceiver chip module to enter a working state, starting a communication waveform algorithm to operate, and entering the awake state to finish work. The loop of the sleep-wake mechanism is completed.
Step 2, if the distress life-saving wireless communication terminal fails to establish contact with the search and rescue center, the distress life-saving wireless communication terminal is only in a receiving mode, the Beidou positioning module RNSS is started to perform positioning, but does not send positioning information, if search information of the search and rescue center is received in the process, the distress life-saving wireless communication terminal establishes contact with the search and rescue center, and then enters a response receiving mode and only responds to a search and rescue center command;
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 per minute but is not transmitted. If search information of the search and rescue center is received in the process, after establishing contact with the search and rescue center, the working flow is ended, and a response receiving mode is entered, namely, only a search and rescue center command is responded, wherein the search and rescue center command comprises an ID number of a return terminal, positioning information, a transmission distance test signal and uploading physiological signs.
And 3, the distress lifesaving wireless communication terminal receives search information of the search and rescue center, after establishing contact with the search and rescue center, the search and rescue center positions the distress lifesaving wireless communication terminal according to positioning information sent by the distress lifesaving wireless communication terminal, and then the distance between the two is judged to obtain the distance between the search and rescue center and the distress lifesaving wireless communication terminal, so that rescue personnel can be unfolded.
The utility model further improves that the distance judging method in the step 3 is as follows:
the search and rescue center transmits the search information signal, and the distress life-saving wireless communication terminal receives the search information signal and then transmits a response information signal with a self number. The search and rescue center judges the distance between the two through receiving the response information signal with the own number sent by the distress rescue wireless communication terminal, and the distance between the search and rescue center and the distress rescue wireless communication terminal is obtained.
Specifically, the search and rescue center transmits a search information signal at intervals during search and rescue, and the distress rescue wireless communication terminal receives the search information signal and responds in time to transmit a response information signal with own number.
As shown in fig. 5, in the process of one interrogation response, the signal processing time T1 of the search and rescue center, the space propagation time T2, the radio frequency receiving front end module 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 transmitting front end module time T7, the space propagation time T8 and the signal receiving processing time T9 are passed through the distress life-saving wireless communication terminal.
The total time required is T, obtained by timer recording of the search and rescue center (the total time from when the search and rescue center sends out a signal to when the received signal is processed is started), t=t1+t2+t3+t4+t5+t6+t7+t8+t9. Wherein, T1, T3, T4, T5, T6, T7 and T9 are all obtained through testing, belong to known parameters, and unknown time is only T2 and T8.
Since the propagation velocity of radio waves in air is 3 x 10 8 m/s, together with a short time for completion of the interrogation response process, it is considered that the distance between the distress rescue wireless communications terminal and the search and rescue center is constant during this time period, so that T2 and T8 can be considered to be equal. Thus, the value of time T2 is multiplied by 3×10 8 The m/s calculates the distance d between the distress lifesaving wireless communication terminal and the search and rescue center.
The calculation formula of the distance d is as follows:
d＝T2*3*10 8 m/s＝0.5*(T-(T1+T3+T4+T5+T6+T7+T9))*3*10 8 m
while the utility model has been described in detail in this specification with reference to the general description and the specific embodiments thereof, it will be apparent to one skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the utility model and are intended to be within the scope of the utility model as claimed.
Claims (8)
1. The utility model provides a wireless communication terminal of lifesaving 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 controlling the starting up by soaking and manually triggering the starting up;
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 the starting management and soaking the starting 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 transceiver 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 immersion alarm signal provided by the immersion detection circuit module, transmitting the immersion alarm signal to the power supply unit, starting the immersion to trigger starting management by the power supply unit, and starting the immersion distress life-saving workflow by utilizing the positioning information provided by the Beidou positioning module; the power unit is used for receiving a manual triggering start-up signal of the power unit, and starting an active distress life-saving workflow 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 digital signal of the search information output by the radio frequency receiving and transmitting chip module; the system comprises a micro control chip module, a positioning information acquisition module, a voice frequency alarm module and a voice frequency alarm 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 improving the sensitivity of various signals: the data signal to be transmitted is processed by convolution coding, framing, spread spectrum and BPSK modulation algorithm in sequence to generate a baseband signal; sequentially performing BPSK demodulation, frame capturing, code tracking, carrier synchronization, despreading, viterbi decoding and synchronous code detection algorithm processing on the received digital signal of the search information to generate a response information signal with own number;
the radio frequency receiving and transmitting chip module is used for receiving the baseband signal output by the digital algorithm processing chip FPGA module, performing digital-to-analog conversion, frequency mixing and filtering processing on the baseband signal and generating a transmitting signal; the digital signal processing device is used for receiving the search information signal output by the radio frequency front end, performing analog-to-digital conversion, mixing and filtering processing on the search information signal, and generating 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 the antenna; the system is used for receiving the search information signal sent by the search and rescue center, amplifying the power of the search information signal and outputting the power to the radio frequency transceiver module.
2. A distress rescue wireless communication terminal according to claim 1 further comprising a bluetooth module, said bluetooth module transmitting distress information to a search and rescue center via an SOS key.
3. A distress rescue wireless communication terminal according to claim 1, wherein said distress rescue wireless communication terminal further comprises a Flash module.
4. The life-saving wireless communication terminal according to claim 1, wherein the digital algorithm processing chip FPGA module generates the audio alert signal by:
the amplitude modulation AM alarm signal with specific sound effect is designed, the wireless communication terminal for life saving in danger transmits the signal at intervals, and the search and rescue center can demodulate the received signal through the amplitude modulation AM and play the signal, so that the alarm sound can be intuitively heard.
5. A life-saving searching method based on a distress life-saving wireless communication terminal is characterized by comprising the following steps:
step 1, when a life-saving wireless communication terminal in distress is not started, the life-saving wireless communication terminal is in a low-power consumption mode; after the distress lifesaving wireless communication terminal is started manually or started by water immersion triggering, the Beidou positioning module RNSS is started to position, the distress lifesaving wireless communication terminal transmits a distress signal with positioning information, a dormancy awakening mechanism is started, the receiving working state and the dormancy state are continuously switched, and simultaneously, an audio alarm signal is transmitted; if the search information signal of the search and rescue center is received in the process, after establishing contact with the search and rescue center, the search and rescue center enters a response receiving mode, and only responds to the search and rescue center command;
step 2, if the distress life-saving wireless communication terminal fails to establish contact with the search and rescue center, the distress life-saving wireless communication terminal 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 in the process, the distress life-saving wireless communication terminal establishes contact with the search and rescue center, the distress life-saving wireless communication terminal enters a response receiving mode and only responds to a search and rescue center command;
and 3, after the distress rescue wireless communication terminal receives a 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 distress rescue wireless communication terminal according to positioning information sent by the distress rescue wireless communication terminal, and determines the distance between the distress rescue wireless communication terminal and the distress rescue wireless communication terminal to obtain the distance between the search and rescue center and the distress rescue wireless communication terminal, so that rescue personnel can be unfolded.
6. The life-saving searching method based on the life-saving wireless communication terminal in danger according to claim 5, wherein the low power consumption mode is:
the digital algorithm processing chip FPGA module pauses the operation of the 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 the IO interface; the micro-control chip module controls the Bluetooth module to enter a sleep state through an instruction, turns off power supply of the Beidou positioning module RNSS through the IO interface output, and only responds to a start-up detection instruction through controlling the internal register to enter a low-power consumption mode.
7. The life-saving searching method of claim 5, wherein the sleep wake-up mechanism is:
according to the working state of the micro control chip module, the digital algorithm processing chip FPGA module 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 wakeup.
8. The life-saving searching method based on the life-saving wireless communication terminal in danger of claim 5, wherein the distance judging method is as follows:
the search and rescue center transmits a search information signal, the distress rescue wireless communication terminal receives the search information signal and then transmits a response information signal with a self number, and the search and rescue center judges the distance between the search and rescue center and the distress rescue wireless communication terminal by receiving the response information signal with the self number transmitted by the distress rescue wireless communication terminal.
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