CN109218989B - Sub-G frequency band ocean emergency call system - Google Patents
Sub-G frequency band ocean emergency call system Download PDFInfo
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- CN109218989B CN109218989B CN201811394958.8A CN201811394958A CN109218989B CN 109218989 B CN109218989 B CN 109218989B CN 201811394958 A CN201811394958 A CN 201811394958A CN 109218989 B CN109218989 B CN 109218989B
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- emergency call
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- receiver
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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
- H04W4/02—Services making use of location information
- H04W4/029—Location-based management or tracking services
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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
- H04B1/7097—Interference-related aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/18502—Airborne stations
- H04B7/18504—Aircraft used as relay or high altitude atmospheric platform
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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]
Abstract
The invention discloses a Sub-G frequency band marine emergency call system, and belongs to the technical field of emergency rescue. It includes emergent center, emergent distress call receiver, emergent distress call relay and N emergent terminal of calling for help, emergent distress call relay sets up on unmanned aerial vehicle, emergent distress call receiver sets up on unmanned aerial vehicle or balloon, emergent terminal of calling for help includes battery, power module, GNSS module, baseband module, power amplifier module and suggestion module, emergent distress call receiver includes power module, GNSS module, baseband module and power amplifier module. The invention has the characteristics of portability, long standby time, high integration degree and the like.
Description
Technical Field
The invention discloses a Sub-G frequency band marine emergency call system, and belongs to the technical field of emergency rescue.
Background
With the progress of the technical level and the enhancement of the ocean consciousness, the investment of China in the aspect of ocean development is more and more, and various economic activities are actively developed. Meanwhile, ocean activities also belong to a high-risk industry, and as the production process is far away from inland, the natural environment changes very often, the sea area range is very large, and the like, the rescue work is difficult to be very large once sudden disasters are encountered. How to accurately find out trapped people becomes a very important task under the condition of far inland and limited traditional communication means.
At present, most solutions for emergency communication in the prior art are satellite communication or unmanned aerial vehicles carry portable base stations, and these emergency communication modes need to realize application frequency bands.
Disclosure of Invention
In view of the above, the invention provides a Sub-G frequency band marine emergency call system, which can provide a call service for people in distress at sea, acquire longitude and latitude information of the people in distress, and has the characteristics of easy carrying, long standby time and high integration degree.
In order to achieve the purpose, the invention adopts the technical scheme that:
a Sub-G frequency band marine emergency call system comprises an emergency center, an emergency call receiver, an emergency call relay and N emergency call terminals, wherein the emergency call relay is arranged on an unmanned aerial vehicle, the emergency call receiver is arranged on the unmanned aerial vehicle or a balloon, the emergency call terminal comprises a battery, a power module, a GNSS module, a baseband module, a power amplification module and a prompt module, and the emergency call receiver comprises the power module, the GNSS module, the baseband module and the power amplification module;
the ith emergency call terminal executes the following procedures after being triggered, wherein i is more than or equal to 1 and less than or equal to N:
(1) synchronizing with an emergency call receiver and other emergency call terminals through a 1pps signal of a GNSS module of the GNSS module;
(2) after the synchronization is successful, positioning is carried out, and after the correct longitude and latitude information is obtained, the longitude and latitude information is sent to the baseband module;
(3) the baseband module packages the ID preset by the terminal and the current longitude and latitude information;
(4) the baseband module performs spread spectrum processing on the baseband signal according to preset spread spectrum parameters;
(5) in the i/2N time slot in 1 second, the baseband module sends distress information on a preset Sub-G frequency point, then switches to a receiving mode and keeps a receiving state;
(6) waiting for a response signal of the emergency call receiver, inquiring whether the response signal contains the ID of the emergency call receiver, and if the response signal containing the ID of the emergency call receiver is not received after a preset time threshold value is exceeded, selecting the next frequency point from a preset series of frequency points to retransmit the call signal;
(7) after receiving the response signal containing the ID of the user, sending out a prompt through a prompt module; the emergency call receiver executes the following procedures after being started:
(1) synchronizing with N emergency call terminals through 1pps signals of a GNSS module of the GNSS module;
(2) entering a receiving state, and monitoring a distress signal of the emergency distress call terminal on a preset frequency point;
(3) recording all terminal IDs received within the first 0.5s in one second, uniformly packaging the ID numbers as response signals, and then sending the response signals in a broadcast mode within the last 0.5 s;
(4) and transmitting the received ID number of the emergency call-for-help terminal and the position information reported by the ID number and the position information to a background emergency center through a ground-air link.
Compared with the prior art, the invention has the following beneficial effects:
1. the emergency call-for-help terminal is not communicated with an emergency center directly, but takes the emergency call-for-help receiver arranged on an unmanned aerial vehicle or a balloon which is lifted off as a relay, thereby reducing the transmitting power of the wireless signal of the terminal and prolonging the standby time and the call-for-help time.
2. The emergency call-for-help terminal improves the anti-interference capability of the call-for-help signal by means of spread spectrum, cognitive radio and the like.
3. The emergency call-for-help terminal and the emergency call-for-help receiver both adopt modular design, and are convenient to use and simple to replace.
4. The emergency call-for-help system can be used in an ISM frequency band and other control frequency bands, the selection range of the frequency bands is expanded, the communication distance is expanded by adopting a relay mode, the use mode is flexible, and the emergency call-for-help system is a good supplement to the traditional emergency communication mode.
Drawings
FIG. 1 is a schematic diagram of the principles of the present invention;
FIG. 2 is a schematic diagram of an emergency call-for-help terminal according to the present invention;
FIG. 3 is a schematic diagram of an emergency call receiver according to the present invention;
FIG. 4 is a timing diagram of a communication protocol according to the present invention.
Detailed Description
The invention is described in further detail below with reference to the figures and the detailed description.
A Sub-G frequency band marine emergency call System comprises an emergency center, an emergency call receiver, an emergency call relay and N emergency call terminals, wherein the emergency call relay is arranged on an unmanned aerial vehicle, the emergency call receiver is arranged on the unmanned aerial vehicle or a balloon, the emergency call terminal comprises a battery, a power module, a Global Navigation Satellite System (GNSS) module, a baseband module, a power amplifier module and a prompt module, the prompt module can adopt a buzzer, a loudspeaker, an indicator light and other elements, and the emergency call receiver comprises the power module, the GNSS module, the baseband module and the power amplifier module;
the ith emergency call terminal executes the following procedures after being triggered, wherein i is more than or equal to 1 and less than or equal to N:
(1) synchronizing with an emergency call receiver and other emergency call terminals through a 1pps signal of a GNSS module of the GNSS module;
(2) after the synchronization is successful, positioning is carried out, and after the correct longitude and latitude information is obtained, the longitude and latitude information is sent to the baseband module;
(3) the baseband module packages the ID preset by the terminal and the current longitude and latitude information;
(4) the baseband module performs spread spectrum processing on the baseband signal according to preset spread spectrum parameters;
(5) in the i/2N time slot in 1 second, the baseband module sends distress information on a preset Sub-G frequency point, then switches to a receiving mode and keeps a receiving state;
(6) waiting for a response signal of the emergency call receiver, inquiring whether the response signal contains the ID of the emergency call receiver, and if the response signal containing the ID of the emergency call receiver is not received after a preset time threshold value is exceeded, selecting the next frequency point from a preset series of frequency points to retransmit the call signal;
(7) after receiving the response signal containing the ID of the user, sending out a prompt through a prompt module;
the emergency call receiver executes the following procedures after being started:
(1) synchronizing with N emergency call terminals through 1pps signals of a GNSS module of the GNSS module;
(2) entering a receiving state, and monitoring a distress signal of the emergency distress call terminal on a preset frequency point;
(3) recording all terminal IDs received within the first 0.5s in one second, uniformly packaging the ID numbers as response signals, and then sending the response signals in a broadcast mode within the last 0.5 s;
(4) and transmitting the received ID number of the emergency call-for-help terminal and the position information reported by the ID number and the position information to a background emergency center through a ground-air link.
The system mainly comprises an emergency call terminal and an emergency call receiver, and the communication principle of the system is shown in figure 1.
The emergency call-for-help terminal is powered by the lithium battery and is carried by offshore operators. The terminal is mainly internally divided into four parts, namely a lithium battery, a power supply module, a baseband module and a power amplifier module. A detailed functional block diagram is shown in fig. 2.
The emergency call receiver is installed on an unmanned aerial vehicle or a balloon and is responsible for collecting help-seeking signals sent by all emergency call terminals in a certain sea area. After receiving the distress signal, the data are packaged and transmitted back to the emergency center through the ground-air link, and meanwhile, the emergency distress call terminal is responded. The receiver is mainly divided into a power supply module, a baseband module and a power amplifier module. A detailed functional block diagram is shown in fig. 3.
After detecting that a call key on the terminal is pressed down, a microprocessor on an internal baseband module of the emergency call terminal starts to supply power to an internal GPS circuit for positioning; and after acquiring the longitude and latitude information with the correct format, adding the terminal ID number, the data packet sequence number and the check information, and transmitting on a frequency point selected in advance. After the emergency call receiver checks the received data packet, the serial number and the latitude and longitude information of the call terminal are extracted and then transmitted back to the background command center through the ground-air link.
The emergency call-for-help terminal and the emergency call-for-help receiver are synchronized through GPS signals, then a TDD mode is adopted to avoid the conflict situation caused by the simultaneous call-for-help of a plurality of terminals, and the specific time slot division is shown in figure 4.
The system is a point-to-multipoint star-shaped emergency call system, trapped people acquire current longitude and latitude information through an emergency call terminal, spread spectrum and frequency selection processing is carried out on the call information in a Sub-G frequency band, the anti-interference capacity of signals is enhanced, then the information is transmitted to an emergency call receiver, and the emergency call receiver is installed on an unmanned aerial vehicle which is executing tasks in the sea area. And the unmanned aerial vehicle integrates the message and then transmits the message back to a rear emergency center. Because the data volume required by the call-for-help content is small, the transmission rate can be reduced to improve the receiving threshold, the transmitting power on the emergency call-for-help terminal is reduced, and the standby time of the terminal is prolonged.
During the use, be equipped with emergent calling for help terminal on going out marine operation ship or personnel, emergent calling for help receiver installs on unmanned aerial vehicle.
If the offshore operation personnel are trapped, a power supply of the emergency call-for-help terminal is turned on, a call-for-help button is pressed, the whole terminal starts to be electrified and works, the GPS module carries out positioning, and the longitude and latitude information is sent to the baseband module after the correct longitude and latitude information is obtained; and the baseband module adds the self preset ID of the terminal into the position information, then carries out spread spectrum processing and sends the information on the preset Sub-G frequency band.
The unmanned aerial vehicle provided with the emergency call receiver can fly to a nearby sea area after getting a ship distress message, or directly carry out long-time patrol flight in an operation sea area. The emergency call-for-help receiver is provided with a plurality of frequency points in advance, and can receive call-for-help information at all the preset frequency points. And after receiving the call information sent by the emergency call terminal, the receiver sends the contained terminal ID number, the latitude and longitude information of the trapped person and the like back to the ground emergency center through the ground-air link. After receiving the information of being trapped, the emergency center sends a confirmation instruction to an emergency call receiver in the unmanned aerial vehicle, and then the receiver sends the confirmation instruction back to the emergency call terminal.
Because the radio environment near the sea area is complex, signals of all frequency bands may exist, and in order to avoid noise interference as much as possible, certain measures are required to be adopted for anti-interference. The invention adopts two methods of spread spectrum and cognitive radio to avoid interference. The spectrum spreading of the transmission signals is carried out by using codes irrelevant to the transmitted data, so that the transmission bandwidth is far larger than the minimum bandwidth required by the transmitted data, and meanwhile, even if the same kind of signals interfere in the air, the interference effect cannot be achieved if the code sequence of the transmitted signals does not exist, and the anti-interference capability of the system can be greatly improved by using a spread spectrum technology. In order to further improve the transmission success rate of the distress signal, the invention also adopts a cognitive radio technology, a series of frequency points are set in advance, the emergency distress terminal starts to transmit the distress signal from a default frequency point, the distress receiver returns a response signal after receiving the distress signal, if the emergency distress terminal does not receive the response signal within a certain time, the next frequency point is selected from the selected frequency point sequence to send the distress signal again until the response signal is received or the emergency distress signal continues from the beginning, and the method reduces the influence of interference signals of different frequency points as much as possible.
In order to solve the situation of the possible distress conflict when a plurality of terminals simultaneously call for help, the distress system divides time slots by means of a 1PPS (pulse per second) signal led out from a GPS (global positioning system) module and realizes the multi-channel signal transmission of the system in a TDD (time division duplex) mode. The concrete mode is as follows:
the emergency call-for-help terminal and the emergency call-for-help receiver are both provided with GPS modules, and after the emergency call-for-help terminal and the emergency call-for-help receiver are started for the first time, synchronization is carried out through 1PPS signals of the GPS modules. And (4) dividing 1s into 2N parts on the assumption that N emergency call terminals exist on the ground. In the first 1/2N time period, the first distress terminal immediately switches to a receiving mode after sending 1 distress signal, and keeps the receiving mode in the rest time of the second; in the next 1/2N, the second distress terminal immediately switches to the receiving mode after sending the distress signal, and the process is carried out until the Nth distress terminal. Therefore, the total transmission of all the N terminals needs 0.5s, the emergency call receiver counts all the terminal IDs received in the first 0.5s, the ID numbers of the received terminals are uniformly packaged to be used as response signals, the response signals are transmitted to all the terminals in the last 0.5s in a broadcasting mode, and all the terminals judge whether the call signals are successfully received or not by inquiring whether the response signals have the IDs.
It should be understood that the above description of the embodiments of the present patent is only an exemplary description for facilitating the understanding of the patent scheme by the person skilled in the art, and does not imply that the scope of protection of the patent is only limited to these examples, and that the person skilled in the art can obtain more embodiments by combining technical features, replacing some technical features, adding more technical features, and the like to the various embodiments listed in the patent without any inventive effort on the premise of fully understanding the patent scheme, and therefore, the new embodiments are also within the scope of protection of the patent.
Claims (1)
1. A Sub-G frequency band marine emergency call system is characterized by comprising an emergency center, an emergency call receiver, an emergency call relay and N emergency call terminals, wherein the emergency call relay is arranged on an unmanned aerial vehicle, the emergency call receiver is arranged on the unmanned aerial vehicle or a balloon, the emergency call terminal comprises a battery, a power module, a GNSS module, a baseband module, a power amplifier module and a prompt module, and the emergency call receiver comprises the power module, the GNSS module, the baseband module and the power amplifier module;
the ith emergency call terminal executes the following procedures after being triggered, wherein i is more than or equal to 1 and less than or equal to N:
(1) synchronizing with an emergency call receiver and other emergency call terminals through a 1pps signal of a GNSS module of the GNSS module;
(2) after the synchronization is successful, positioning is carried out, and after the correct longitude and latitude information is obtained, the longitude and latitude information is sent to the baseband module;
(3) the baseband module packages the ID preset by the terminal and the current longitude and latitude information;
(4) the baseband module performs spread spectrum processing on the baseband signal according to preset spread spectrum parameters;
(5) in the i/2N time slot in 1 second, the baseband module sends distress information on a preset Sub-G frequency point, then switches to a receiving mode and keeps a receiving state;
(6) waiting for a response signal of the emergency call receiver, inquiring whether the response signal contains the ID of the emergency call receiver, and if the response signal containing the ID of the emergency call receiver is not received after a preset time threshold value is exceeded, selecting the next frequency point from a preset series of frequency points to retransmit the call signal;
(7) after receiving the response signal containing the ID of the user, sending out a prompt through a prompt module;
the emergency call receiver executes the following procedures after being started:
(1) synchronizing with N emergency call terminals through 1pps signals of a GNSS module of the GNSS module;
(2) entering a receiving state, and monitoring a distress signal of the emergency distress call terminal on a preset frequency point;
(3) recording all terminal IDs received within the first 0.5s in one second, uniformly packaging the ID numbers as response signals, and then sending the response signals in a broadcast mode within the last 0.5 s;
(4) and transmitting the received ID number of the emergency call-for-help terminal and the position information reported by the ID number and the position information to a background emergency center through a ground-air link.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811394958.8A CN109218989B (en) | 2018-11-22 | 2018-11-22 | Sub-G frequency band ocean emergency call system |
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| CN201811394958.8A CN109218989B (en) | 2018-11-22 | 2018-11-22 | Sub-G frequency band ocean emergency call system |
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| CN109218989A CN109218989A (en) | 2019-01-15 |
| CN109218989B true CN109218989B (en) | 2020-05-26 |
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| US6275164B1 (en) * | 1998-12-11 | 2001-08-14 | Macconnell John W. | Emergency locator system |
| CN101662323B (en) * | 2008-08-29 | 2013-04-17 | 上海无线电设备研究所 | Multi-user conflict processing method for maritime personal emergency position indicating system |
| CN101408610A (en) * | 2008-11-21 | 2009-04-15 | 哈尔滨工程大学 | Spread-spectrum radio live-saving device based on big dipper and life-saving signal processing method |
| CN101493514A (en) * | 2008-12-30 | 2009-07-29 | 杭州杰宁电子科技有限公司 | Information sending apparatus, information receiving apparatus and searching and rescuing system on sea |
| CN103052025A (en) * | 2012-12-13 | 2013-04-17 | 哈尔滨飞羽科技有限公司 | Improved EPIRB (Emergency Position Indicating Radio-Beacon) |
| CN104683942A (en) * | 2013-11-27 | 2015-06-03 | 哈尔滨飞羽科技有限公司 | Marine emergency position-indicating radio beacon |
| CN104035106B (en) * | 2014-06-26 | 2017-02-15 | 桂林电子科技大学 | Salvage system and method based on beidou navigation and communication |
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