CN111510196B - Space-based search and rescue system based on Lora technology - Google Patents
Space-based search and rescue system based on Lora technology Download PDFInfo
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- CN111510196B CN111510196B CN202010236338.2A CN202010236338A CN111510196B CN 111510196 B CN111510196 B CN 111510196B CN 202010236338 A CN202010236338 A CN 202010236338A CN 111510196 B CN111510196 B CN 111510196B
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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
- H04B7/1851—Systems using a satellite or space-based relay
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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
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18515—Transmission equipment in satellites or space-based relays
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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
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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
- H04W4/12—Messaging; Mailboxes; Announcements
- H04W4/14—Short messaging services, e.g. short message services [SMS] or unstructured supplementary service data [USSD]
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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
- H04W88/16—Gateway arrangements
Abstract
The invention discloses a space-based search and rescue system based on a Lora technology. The system comprises: the system comprises a ground search and rescue terminal, a Lora search and rescue gateway, a search and rescue information sending terminal and a ground receiving terminal; the ground search and rescue terminal comprises a positioning module and a Lora terminal module, the positioning module sends positioning information to the Lora terminal module, and the Lora terminal module sends the search and rescue information comprising the positioning information to the Lora search and rescue gateway through a wireless signal; the Lora search and rescue gateway and the search and rescue information sending terminal are both installed on a low-orbit satellite, the Lora search and rescue gateway sends search and rescue information to the search and rescue information sending terminal, and the search and rescue information sending terminal sends the search and rescue information to the ground receiving terminal through a wireless link; and the ground receiving terminal receives and processes the search and rescue information. The system of the invention adopts the low orbit satellite as the transfer satellite to construct the satellite-ground through link without transferring through the ground station, can shorten the transmission link, improve the response time and the anti-interception capability, reduce the transmitting power of the ground terminal, and is convenient for miniaturization and long-life design.
Description
Technical Field
The invention relates to the technical field of satellite communication, in particular to a space-based search and rescue system based on a Lora technology.
Background
Because the coverage range of satellite receiving and transmitting signals is wide, and satellite-ground links are in wireless connection, large-scale station arrangement on the ground is not needed, the limitation of regions is avoided, emergency search and rescue implemented by utilizing space-based resources become an important component of a global search and rescue system, and distress alarm and positioning service is provided for the whole world including the sea, land and air including polar regions.
The existing space-based search and rescue system mainly comprises a search and rescue system based on a Beidou satellite navigation system and an all-weather satellite communication system, when the existing search and rescue system based on the Beidou satellite navigation system and the all-weather satellite communication system works, a Beidou satellite or the all-weather satellite firstly realizes search and rescue positioning of a search and rescue target in a short message communication mode, and then transmits acquired search and rescue information to a ground search and rescue command center and a search and rescue unit in a short message communication mode so as to complete search and rescue functions of the search and rescue target.
The inventor finds that the prior art has at least the following problems:
in the existing search and rescue method of the search and rescue system based on the Beidou satellite navigation system and the heaven-earth satellite communication system, search and rescue information can reach a search and rescue command center and a search and rescue unit only by being transferred through a Beidou ground station or an heaven-earth ground gateway station and the like, so that the method has the advantages of multiple intermediate links, long search and rescue process, limited user capacity, slow response speed, poor anti-interference and anti-interception capabilities, and incapability of adapting to search and rescue tasks under the characteristics of multiple times, high real time, strong burst and the like; and the existing Beidou satellite and the sky-earth satellite are both positioned in a medium-high orbit, the satellite-ground transmission link is long, the signal attenuation caused by free space transmission is large, the transmitting power of the ground search and rescue terminal is required to be large, the miniaturization and long-life work of the terminal is not facilitated, and the cost is increased.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides a space-based search and rescue system based on the Lora technology.
Therefore, the invention discloses a space-based search and rescue system based on the Lora technology, which comprises: the system comprises a ground search and rescue terminal, a Lora search and rescue gateway, a search and rescue information sending terminal and a ground receiving terminal;
the ground search and rescue terminal is arranged on ground mobile equipment and comprises a positioning module and an Lora terminal module which are connected with each other, the Lora terminal module is in wireless connection with the Lora search and rescue gateway, the positioning module is used for determining positioning information of the Lora terminal module and sending the positioning information to the Lora terminal module, and the Lora terminal module sends the search and rescue information including the positioning information to the Lora search and rescue gateway through wireless signals;
the Lora search and rescue gateway and the search and rescue information sending terminal are both installed on a low earth orbit satellite and are connected with each other, the Lora search and rescue gateway is used for receiving and analyzing the search and rescue information and sending the search and rescue information to the search and rescue information sending terminal, and the search and rescue information sending terminal directionally sends the received search and rescue information to the ground receiving terminal through a wireless link;
and the ground receiving terminal is arranged in the ground search and rescue command center and is used for receiving and processing the search and rescue information.
Further, in the above-mentioned space-based search and rescue system based on Lora technology, the search and rescue information includes: the ground search and rescue terminal ID identification code, the time information for initiating rescue and the positioning information.
Further, in the above-mentioned space-based search and rescue system based on Lora technique, the positioning module adopts a radio frequency baseband integrated chip adapted to a global satellite positioning system, and the positioning module and the Lora terminal module are connected through a UART.
Further, in the above-mentioned space-based search and rescue system based on Lora technology, the Lora terminal module employs SX1278 chip of SX127X series.
Further, in the above-mentioned sky based search and rescue system based on Lora technique, the Lora search and rescue gateway adopts the Lora gateway chip with Lora terminal module looks adaptation.
Further, in the above-mentioned sky based search and rescue system based on Lora technique, the Lora search and rescue gateway adopts the SX1301 chip, the Lora search and rescue gateway with search and rescue information sending terminal passes through the SPI and connects.
Further, in the above-mentioned sky-based search and rescue system based on Lora technique, the Lora search and rescue gateway is configured to the receiving state conventionally, the search and rescue information sending terminal is configured to the low power consumption standby state conventionally, and the Lora search and rescue gateway sends the search and rescue information and the enabling signal to the search and rescue information sending terminal.
Further, in the above-mentioned space-based search and rescue system based on Lora technology, the transmitting antenna of the search and rescue information sending terminal adopts a directional antenna, and the transmitting frequency band adopts a Ka frequency band.
Further, in the above-mentioned space-based search and rescue system based on Lora technology, the directional antenna is a tile-type phased array antenna.
Further, in the above-mentioned space-based search and rescue system based on Lora technology, the search and rescue information sending terminal and the ground receiving terminal operate at the same frequency point.
The space-based search and rescue system based on the Lora technology adopts the low-earth orbit satellite as the transfer satellite to construct the satellite-ground through link, and the transfer is not required to be carried out through the Beidou ground station or the space-ground gateway station, so that the transmission link is effectively shortened, the alarm response time and the interception resistance are improved, the transmitting power of the ground terminal is reduced, and the ground terminal is convenient to be miniaturized and has long service life; meanwhile, the existing LoraWAN signal system is used for information transmission, bottom-layer software development is not needed, the development period is short, and the system construction cost is effectively reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic structural diagram of a space-based search and rescue system based on Lora technology according to an embodiment of the present invention.
Description of reference numerals:
the system comprises a 1-ground search and rescue terminal, a 11-positioning module, a 12-Lora terminal module, a 2-Lora search and rescue gateway, a 3-search and rescue information sending terminal and a 4-ground receiving terminal.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
The technical scheme provided by the embodiment of the invention is described in detail below with reference to the accompanying drawings.
As shown in fig. 1, an embodiment of the present invention provides a space-based search and rescue system based on Lora technology, including: the system comprises a ground search and rescue terminal 1, a Lora search and rescue gateway 2, a search and rescue information sending terminal 3 and a ground receiving terminal 4; the ground search and rescue terminal 1 is installed on ground mobile equipment and comprises a positioning module 11 and a Lora terminal module 12 which are connected with each other, the Lora terminal module 12 is in wireless connection with the Lora search and rescue gateway 2, the positioning module 11 is used for determining positioning information of the Lora terminal module 12 and sending the positioning information to the Lora terminal module 11, and the Lora terminal module 12 sends the search and rescue information including the positioning information to the Lora search and rescue gateway 2 through wireless signals; the Lora search and rescue gateway 2 and the search and rescue information sending terminal 3 are both installed on a low orbit satellite and are connected with each other, the Lora search and rescue gateway 2 is used for receiving and analyzing search and rescue information and sending the search and rescue information to the search and rescue information sending terminal 3, and the search and rescue information sending terminal 3 directionally sends the received search and rescue information to the ground receiving terminal 4 through a wireless link; the ground receiving terminal 4 is installed in the ground search and rescue command center and used for receiving and processing search and rescue information.
Specifically, when the space-based search and rescue system based on the Lora technology provided by the embodiment of the invention is used and when a certain object on the ground meets a dangerous situation and needs to be rescued, the ground search and rescue terminal 1 carried by the ground search and rescue terminal 1 is started, the positioning module 11 of the ground search and rescue terminal 1 acquires the positioning information of the ground search and rescue terminal and sends the acquired positioning information to the Lora terminal module 12, the Lora terminal module 12 receives and processes the positioning information, the search and rescue information including the positioning information is sent to the Lora search and rescue gateway 2 in a wireless signal mode based on the existing LoraWAN signal system, the Lora search and rescue gateway 2 receives and analyzes the search and rescue information sent by the Lora terminal module 12 and sends the search and rescue information to the search and rescue information sending terminal 3, the search and rescue information sending terminal 3 receives the search and rescue information and sends the search and rescue information to the ground receiving terminal 4 in a directional mode through a wireless link, the ground receiving terminal 4 receives and processes the search and rescue information, and carrying out search and rescue actions according to the search and rescue information.
In order to improve the search and rescue efficiency, in an embodiment of the present invention, each ground search and rescue terminal 1 may set a unique ID code, and the search and rescue information sent by the Lora terminal module 12 of the ground search and rescue terminal 1 to the Lora search and rescue gateway 2 may include: the ground search and rescue terminal ID identification code, the time information for initiating rescue and the positioning information.
The following describes the operating principle of each module in the space-based search and rescue transceiver terminal according to an embodiment of the present invention by using a specific example.
In an embodiment of the present invention, the positioning module 11 of the ground search and rescue terminal 1 may adopt a radio frequency baseband integrated chip adapted to a global positioning satellite system, and the positioning module 11 and the Lora terminal module 12 may be connected through a UART (universal asynchronous receiver transmitter). The global positioning system may be one or more of BDS (Beidou satellite navigation system), GPS (global positioning system), GLONASS (GLONASS global satellite navigation system), and Galileo (Galileo satellite positioning system). So set up, ground search and rescue terminal 1 can realize the quick acquisition of locating information, is convenient for in time ask for help when being in distress.
Specifically, the positioning module 11 may adopt a positioning chip with a model of ufirebaird UC6226, and the positioning chip can support four positioning systems, namely BDS, GPS, GLONASS and Galileo, and can implement multi-system joint positioning, and has the advantages of low power consumption and miniaturization.
Further, in an embodiment of the present invention, on the basis of the selected positioning module 11, the Lora terminal module 12 may adopt SX1278 chips in SX127X series; so set up, satisfying under the condition that service function required, can realize ground search and rescue terminal 1's miniaturization, be convenient for ground search and rescue terminal 1 imbeds in the small-size mobile device such as smart mobile phone, electron wrist table and bracelet. In this embodiment, the operating parameters of the SX1278 chip provided by the present invention may be configured according to table 1.
Table 1(SX1278 working parameters of chip)
| Parameter name | Parameter value |
| Working frequency point | 433MHz |
| Transmitting power | 20dBm |
| Spreading factor | SF12 |
| Information rate | |
| Code rate | |
| 4/5 |
Further, in an embodiment of the present invention, in order to improve the working duration of the ground search and rescue terminal 1, the normal mode of the Lora terminal module 12 may be set to a low power consumption standby mode, and when receiving the positioning information sent by the positioning module 11, the Lora terminal module starts working, and sends the search and rescue information including the positioning information to the Lora search and rescue gateway 2; in order to help the distress object, the ground search and rescue terminal 1 may be designed in a one-key start mode.
In the case of the above-mentioned specifically set ground search and rescue terminal 1, the word length information of the search and rescue information sent by the Lora terminal module 12 may be set according to table 2.
Watch 2 (word length information of search and rescue information)
| Parameter name | Parameter length/bit |
| ID identification code | 16 |
| Moment of initiating search and rescue | 32 |
| Positioning information | 64 |
Further, in an embodiment of the present invention, the Lora search and rescue gateway 2 employs an Lora gateway chip adapted to the Lora terminal 12 module. The Lora terminal module 12 and the Lora search and rescue gateway 2 transmit information by using the existing LoraWAN signal system.
Specifically, in an embodiment of the present invention, the Lora search and rescue gateway 2 may adopt an SX1301 chip of Semtech corporation, and the Lora search and rescue gateway 2 and the search and rescue information sending terminal 3 may be connected through an SPI (serial peripheral interface).
Wherein, the working parameter of the Lora search and rescue gateway 2 can be configured according to the working parameter of the Lora terminal module 12 to ensure that the Lora terminal module 12 and the Lora search and rescue gateway 2 can adapt to work.
In an embodiment of the present invention, the Lora search and rescue gateway 2 is configured to be in a receiving state conventionally, the search and rescue information sending terminal 3 is configured to be in a low power consumption standby state conventionally, when the Lora search and rescue gateway 2 receives the search and rescue information sent by the Lora terminal module 12, the Lora search and rescue gateway 2 sends the search and rescue information and the enabling signal to the search and rescue information sending terminal 3, the search and rescue information sending terminal 3 starts a transmitting mode after receiving the enabling signal, and the received search and rescue information is sent to the ground receiving terminal 4 through a wireless link. By the arrangement, the working time of the search and rescue information sending terminal 3 can be effectively prolonged.
In an embodiment of the present invention, the transmitting antenna of the search and rescue information sending terminal 3 is a directional antenna, and the transmitting frequency band is a Ka frequency band.
The beam direction of the directional antenna can be determined by calculation according to the coordinates of the ground receiving terminal 4 and the ephemeris of the low-orbit satellite where the search and rescue information transmitting terminal 3 is located.
The directional antenna may be a tile-type phased array antenna with a beam agility function, and specifically may be a tile-type phased array antenna using 64 array elements.
Further, in an embodiment of the present invention, the search and rescue information sending terminal 3 and the ground receiving terminal 4 operate at the same frequency point. The ground receiving terminal 4 may be set at a fixed position, or may be a mobile terminal, and when the ground receiving terminal 4 is used as a mobile terminal, the ground receiving terminal 4 further uploads its own position information to the low earth orbit satellite in a measurement and control manner.
Therefore, the space-based search and rescue system based on the Lora technology provided by the embodiment of the invention adopts the low-earth orbit satellite as the transfer satellite to construct the satellite-ground through link, and the transfer is not needed by the Beidou ground station or the space-ground gateway station, so that the transmission link is effectively shortened, the alarm response time and the anti-interception capability are improved, the transmitting power of the ground terminal is reduced, and the ground terminal is convenient to be miniaturized and has a long service life; meanwhile, the existing LoraWAN signal system is used for information transmission, bottom-layer software development is not needed, the development period is short, and the system construction cost is effectively reduced.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. In addition, "front", "rear", "left", "right", "upper" and "lower" in this document are referred to the placement states shown in the drawings.
Finally, it should be noted that: the above examples are only for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. The utility model provides a day base search and rescue system based on Lora technique which characterized in that, day base search and rescue system includes: the system comprises a ground search and rescue terminal (1), a Lora search and rescue gateway (2), a search and rescue information sending terminal (3) and a ground receiving terminal (4);
the ground search and rescue terminal (1) is installed on ground mobile equipment and comprises a positioning module (11) and a Lora terminal module (12) which are connected with each other, the Lora terminal module (12) is in wireless connection with the Lora search and rescue gateway (2), the positioning module (11) is used for determining positioning information of the Lora terminal module (12) and sending the positioning information to the Lora terminal module, and the Lora terminal module (12) sends the search and rescue information including the positioning information to the Lora search and rescue gateway (2) through wireless signals;
the Lora search and rescue gateway (2) and the search and rescue information sending terminal (3) are both installed on a low-orbit satellite and are connected with each other, the Lora search and rescue gateway (2) is used for receiving and analyzing the search and rescue information and sending the search and rescue information to the search and rescue information sending terminal (3), and the search and rescue information sending terminal (3) directionally sends the received search and rescue information to the ground receiving terminal (4) through a wireless link;
the ground receiving terminal (4) is arranged in a ground search and rescue command center and is used for receiving and processing the search and rescue information;
the Lora terminal module (12) adopts SX1278 chips of SX127X series, the Lora search and rescue gateway (2) adopts a Lora gateway chip matched with the Lora terminal module (12), and the working parameters of the Lora search and rescue gateway (2) are configured according to the working parameters of the Lora terminal module (12);
lora search and rescue gateway (2) conventional configuration is the receiving state, search and rescue information sending terminal (3) conventional configuration is low-power consumption standby state, works as Lora search and rescue gateway (2) receive after the search and rescue information that Lora terminal module (12) sent, Lora search and rescue gateway (2) to search and rescue information sending terminal (3) send search and rescue information and enable signal, search and rescue information sending terminal (3) are received open the transmission mode behind the enable signal, will receive search and rescue information send for ground receiving terminal (4).
2. The Lora technology based space-based search and rescue system according to claim 1, wherein the search and rescue information comprises: the ground search and rescue terminal ID identification code, the time information for initiating rescue and the positioning information.
3. The space-based search and rescue system based on the Lora technology as claimed in claim 1, wherein the positioning module (11) is a radio frequency baseband integrated chip adapted to a global satellite positioning system, and the positioning module (11) and the Lora terminal module (12) are connected through a UART.
4. The space-based search and rescue system based on the Lora technology as claimed in claim 1, wherein the Lora search and rescue gateway (2) adopts an SX1301 chip, and the Lora search and rescue gateway (2) and the search and rescue information sending terminal (3) are connected through an SPI.
5. The space-based search and rescue system based on Lora technology of claim 1, wherein the transmitting antenna of the search and rescue information sending terminal (3) is a directional antenna, and the transmitting frequency band is Ka frequency band.
6. The Lora technology based space-based search and rescue system according to claim 5, wherein the directional antenna is a tile-type phased array antenna.
7. The space-based search and rescue system based on the Lora technology as claimed in claim 1, wherein the search and rescue information sending terminal (3) and the ground receiving terminal (4) work at the same frequency point.
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| CN113419256A (en) * | 2021-07-01 | 2021-09-21 | 中国人民解放军军事科学院国防科技创新研究院 | Spacecraft return searching and positioning system and searching and positioning method |
| CN114257296B (en) * | 2021-12-28 | 2022-09-20 | 军事科学院系统工程研究院网络信息研究所 | Signaling interaction-free satellite emergency lifesaving communication method suitable for low signal-to-noise ratio |
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