CN112787704A - Vehicle-mounted intelligent satellite meteorological hydrological communication system - Google Patents
Vehicle-mounted intelligent satellite meteorological hydrological communication system Download PDFInfo
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- CN112787704A CN112787704A CN202011559179.6A CN202011559179A CN112787704A CN 112787704 A CN112787704 A CN 112787704A CN 202011559179 A CN202011559179 A CN 202011559179A CN 112787704 A CN112787704 A CN 112787704A
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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
- H04B7/18519—Operations control, administration or maintenance
Abstract
The invention discloses a weather and hydrological communication system of a vehicle-mounted intelligent satellite, which comprises a vehicle-mounted intelligent terminal, a power supply module, a positioning module, a ground communication control center, a coding and decoding module and a plurality of communication satellites, wherein the vehicle-mounted intelligent terminal is arranged on a vehicle, the power supply module is electrically connected with the vehicle-mounted intelligent terminal, the positioning module is arranged on the vehicle-mounted intelligent terminal, the ground communication control center is in data communication connection with the vehicle-mounted intelligent terminal through a wireless network, the communication satellites are in communication connection with the ground communication control center, and the coding and decoding module is respectively arranged on the vehicle-mounted intelligent terminal and the communication satellites. The invention has good communication quality, improves the transmission accuracy of message data, can keep the original coding performance, solves the problems of prolonged transmission time of a satellite communication link, easy signal fading and high error rate, greatly reduces the coding and decoding overhead and improves the decoding success rate.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a vehicle-mounted intelligent satellite meteorological hydrological communication system.
Background
Satellite meteorology is a subject for researching atmosphere by using satellite detection data, and is also a subject for researching how to acquire meteorological elements by using a satellite remote sensing technology and analyzing and researching atmosphere evolution law by using detection data of the meteorological elements. It is an atmospheric science branch developed with the advent of artificial earth satellites.
The cloud pictures and sounding, wind measuring and radiation data acquired by the satellite are processed and output by a computer to obtain visual information, and weather analysis and forecast, climate monitoring, underlying surface dynamic, disaster and disaster monitoring are provided.
Most of the existing satellite weather hydrological communication systems need to design a combined communication system, an optimal communication satellite cannot be selected in a self-adaptive mode, the satellite communication link is prolonged in transmission, signals are prone to fading, the error rate is high, the coding and decoding overhead is greatly increased, and the decoding success rate is low.
Disclosure of Invention
The invention aims to provide a vehicle-mounted intelligent satellite meteorological hydrological communication system which can adaptively select an optimal communication satellite, so that good communication quality is always kept, the problem of poor communication quality after a vehicle enters a remote mountain area is solved, the transmission accuracy of message data is improved, the original coding performance can be kept, the problems of prolonging of a satellite communication link during transmission, easiness in signal fading and high error rate are solved, the coding and decoding overhead is greatly reduced, and the decoding success rate is improved, so that the problems in the background technology are solved.
In order to achieve the purpose, the invention provides the following technical scheme:
on-vehicle intelligent satellite meteorological hydrology communication system includes:
the vehicle-mounted intelligent terminal is arranged on a vehicle;
the power supply module is electrically connected with the vehicle-mounted intelligent terminal and is used for supplying power to the vehicle-mounted intelligent terminal;
the positioning module is arranged on the vehicle-mounted intelligent terminal and is used for positioning the position of the vehicle-mounted intelligent terminal;
the ground communication control center is in data communication connection with the vehicle-mounted intelligent terminal through a wireless network, and is used for scheduling a communication link of the vehicle-mounted intelligent terminal according to the position positioned by the positioning module;
the communication satellites are all in communication connection with the ground communication control center, one of the communication satellites is in communication connection with the vehicle-mounted intelligent terminal according to a communication link scheduled by the ground communication control center, and the communication satellites are used for sending weather hydrological data files to the vehicle-mounted intelligent terminal;
and the coding and decoding module is respectively arranged on the vehicle-mounted intelligent terminal and the plurality of communication satellites and is used for coding, transmitting and decoding the meteorological hydrological data file sent to the vehicle-mounted intelligent terminal by the communication satellites.
Preferably, the positioning module comprises a GPS module and a Beidou positioning module.
Preferably, the power module includes a storage battery and a power interface, the storage battery and the power interface are electrically connected to the vehicle-mounted intelligent terminal, the power interface is used for the vehicle-mounted intelligent terminal to obtain power from a vehicle, and the storage battery is used for providing standby power for the vehicle-mounted intelligent terminal.
Preferably, in the weather-hydrological communication system of the vehicle-mounted intelligent satellite according to the present invention, the specific method for encoding, transmitting and decoding the weather-hydrological data file transmitted from the communication satellite to the vehicle-mounted intelligent terminal by the codec module includes:
s11, segmenting the sent files to form original information groups;
s12, fountain code coding is carried out on the original information packet to form a coding packet;
s13, sending the code packet to the vehicle-mounted intelligent terminal through a communication link, and decoding the fountain codes after the vehicle-mounted intelligent terminal receives enough data packets;
s14, if all original information packets cannot be recovered, feeding back the number of the data block to be retransmitted and the quality condition of the communication link to the communication satellite, and if all the original information packets are recovered, not starting a feedback mechanism;
and S15, if the communication satellite receives the feedback information, dynamically adjusting fountain code encoding parameters in real time according to the quality condition of the communication link, and starting a retransmission mechanism.
Preferably, in the vehicle-mounted intelligent satellite weather-hydrological communication system of the present invention, the specific encoding method in S12 includes:
s121, constructing a full rank matrix A according to the code length K and the packet length L in the real-time coding parameters;
s122, performing inverse transformation on the construction matrix A, and performing precoding on an original information packet to obtain an intermediate coding packet C;
and S123, coding the intermediate code packet C by using a code generator to obtain a code packet to be sent.
Preferably, in the vehicle-mounted intelligent satellite weather hydrological communication system of the present invention, the step S14 further includes creating a queue storing at most M data at the receiving end, for storing the packet loss rate of each data block; the queue is set to
If the original information packet cannot be completely recovered after the data is received, then the calculation is carried outAnd (3) feeding back the number of the data blocks needing to be retransmitted and the real-time packet loss rate Pt representing the quality condition of the communication link to the communication satellite together, wherein Pi represents the packet loss rate of the ith data block, N represents the number of the data blocks, and the maximum number is M.
Preferably, in the vehicle-mounted intelligent satellite weather hydrological communication system of the present invention, after the communication satellite receives the feedback information in step S15, the packet loss rate Pt representing the quality status of the communication link is obtained, and then the formula is used to obtain the packet loss rate Pt
And calculating and analyzing to obtain real-time fountain code coding redundancy, wherein beta is the fountain code coding redundancy, beta' represents the fountain code coding redundancy under the allowable decoding failure probability, and after the real-time fountain code coding redundancy is obtained through calculation and analysis, the fountain code coding parameters are adjusted in real time, and the data blocks needing to be retransmitted are coded and retransmitted.
Preferably, in the weather-hydrological communication system with a vehicle-mounted intelligent satellite according to the present invention, the specific method for establishing a communication connection between one of the communication satellites and the vehicle-mounted intelligent terminal according to the communication link scheduled by the ground communication control center includes:
s21, receiving a communication request of the vehicle-mounted intelligent terminal requesting communication, and positioning the geographic position of the vehicle-mounted intelligent terminal according to the positioning module;
and S22, the ground communication control center determines the access communication satellite of the vehicle-mounted intelligent terminal by utilizing a preset closest distance access strategy based on the acquired geographic position information of the plurality of communication satellites and the geographic position information of the vehicle-mounted intelligent terminal.
Preferably, in the vehicle-mounted intelligent satellite weather-hydrological communication system of the present invention, the specific method for acquiring the geographic position information of the plurality of communication satellites in S22 includes:
s31, according to the longitude and latitude of the communication satellite, calculating a mapping latitude corresponding to the communication satellite when the communication satellite is mapped to the earth meridian by using a preset longitude and latitude mapping formula, and determining the communication satellite as an orbit reference satellite;
s32, calculating to obtain the mapping latitude of the adjacent satellites in the same orbit of the orbit reference satellite according to the mapping latitude of the orbit reference satellite and a first preset latitude difference value between the orbit reference satellite and the adjacent satellites in the same orbit, and calculating to obtain the longitude and latitude of the adjacent satellites in the same orbit by using a preset longitude and latitude reflection equation according to the mapping latitude of the adjacent satellites in the same orbit and a preset deflection angle between a satellite orbit and an earth meridian;
s33, judging whether the longitude and latitude of all satellites in the same orbit with the communication satellite are obtained or not, if the longitude and latitude of all satellites in the same orbit with the communication satellite are obtained, recording the obtained longitude and latitude of all satellites in the same orbit with the communication satellite, and taking all satellites in the orbit where the communication satellite is located as network reference satellites;
s34, calculating mapping latitudes of all satellites on a second orbit which is adjacent to the first orbit in an abnormal orbit according to the mapping latitudes of all network reference satellites and a second preset latitude difference value between each network reference satellite and an adjacent satellite in the abnormal orbit, wherein the first orbit is an orbit in which each network reference satellite is located, and calculating the longitude and latitude of all satellites on the second orbit by using a preset longitude and latitude reflection formula according to the mapping latitudes of all satellites on the second orbit and a preset deflection angle between a satellite orbit and an earth meridian;
s35, judging whether the longitude and latitude of all the satellites in the different orbits with the communication satellite are obtained, and recording the obtained longitude and latitude of all the satellites in the different orbits with the satellite if the longitude and latitude of all the satellites in the different orbits with the satellite are obtained.
Preferably, in the weather-hydrological communication system using a vehicle-mounted intelligent satellite of the present invention, the specific method for determining the access communication satellite of the vehicle-mounted intelligent terminal by using the preset closest access policy in S22 includes:
s41, calculating to obtain the distance between each communication satellite and the vehicle-mounted intelligent terminal by using a preset nearest distance calculation formula based on the acquired geographic position information of the plurality of communication satellites and the geographic position information of the vehicle-mounted intelligent terminal;
wherein the predetermined closest distance is calculated by the formula
dnR is the radius of the earth and h is the distance between each communication satellite and the vehicle-mounted intelligent terminalnIs the altitude, beta, of satellite nnThe elevation angle of the satellite n is obtained by utilizing a preset satellite elevation angle calculation formula;
wherein the preset calculation formula of the satellite elevation angle is
And S42, judging whether the distance between the communication satellite and the vehicle-mounted intelligent terminal is minimum, and if so, determining that the communication satellite is the access satellite of the vehicle-mounted intelligent terminal.
Compared with the prior art, the invention has the beneficial effects that:
the invention dispatches the communication link of the vehicle-mounted intelligent terminal according to the position positioned by the positioning module through the ground communication control center, so that one of the communication satellites is in communication connection with the vehicle-mounted intelligent terminal according to the communication link dispatched by the ground communication control center, sends a meteorological hydrological data file to the vehicle-mounted intelligent terminal, and codes, transmits and decodes the meteorological hydrological data file sent to the vehicle-mounted intelligent terminal by the communication satellite through the coding and decoding module, can adaptively select the optimal communication satellite, so that the good communication quality is always kept, the problem of poor communication quality after the vehicle enters a remote mountain area is solved, the transmission accuracy of message data is improved, the original coding performance is kept, the problems of extension during the transmission of the satellite communication link, easy signal fading and high error rate are solved, and the coding and decoding overhead is greatly reduced, the decoding success rate is improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a flowchart of a specific method for encoding, transmitting and decoding a weather hydrological data file sent by a communication satellite to a vehicle-mounted intelligent terminal by a coding and decoding module according to the present invention;
FIG. 3 is a specific encoding flow diagram of fountain code encoding of an original information packet according to the present invention;
FIG. 4 is a flowchart of a specific method for one of the communication satellites to establish a communication connection with the on-board intelligent terminal according to a communication link scheduled by the ground communication control center according to the present invention;
FIG. 5 is a flowchart of a method for acquiring geographic location information of a plurality of communication satellites according to the present invention;
fig. 6 is a flowchart of a specific method for determining an access communication satellite of the vehicle-mounted intelligent terminal by using a preset closest distance access policy according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Examples
Referring to fig. 1-6, the present invention provides a technical solution:
on-vehicle intelligent satellite meteorological hydrology communication system includes:
the vehicle-mounted intelligent terminal is arranged on a vehicle;
the power supply module is electrically connected with the vehicle-mounted intelligent terminal and is used for supplying power to the vehicle-mounted intelligent terminal;
the positioning module is arranged on the vehicle-mounted intelligent terminal and is used for positioning the position of the vehicle-mounted intelligent terminal;
the ground communication control center is in data communication connection with the vehicle-mounted intelligent terminal through a wireless network, and is used for scheduling a communication link of the vehicle-mounted intelligent terminal according to the position positioned by the positioning module;
the communication satellites are all in communication connection with the ground communication control center, one of the communication satellites is in communication connection with the vehicle-mounted intelligent terminal according to a communication link scheduled by the ground communication control center, and the communication satellites are used for sending weather hydrological data files to the vehicle-mounted intelligent terminal;
and the coding and decoding module is respectively arranged on the vehicle-mounted intelligent terminal and the plurality of communication satellites and is used for coding, transmitting and decoding the meteorological hydrological data file sent to the vehicle-mounted intelligent terminal by the communication satellites.
As a technical optimization scheme of the invention, the positioning module comprises a GPS module and a Beidou positioning module.
As a technical optimization scheme of the invention, the power module includes a storage battery and a power interface, the storage battery and the power interface are respectively electrically connected to the vehicle-mounted intelligent terminal, the power interface is used for the vehicle-mounted intelligent terminal to obtain power from a vehicle, and the storage battery is used for providing standby power for the vehicle-mounted intelligent terminal.
As a technical optimization scheme of the present invention, the specific method for encoding, transmitting and decoding the meteorological hydrological data file sent to the vehicle-mounted intelligent terminal by the encoding and decoding module includes:
s11, segmenting the sent files to form original information groups;
s12, fountain code coding is carried out on the original information packet to form a coding packet;
s13, sending the code packet to the vehicle-mounted intelligent terminal through a communication link, and decoding the fountain codes after the vehicle-mounted intelligent terminal receives enough data packets;
s14, if all original information packets cannot be recovered, feeding back the number of the data block to be retransmitted and the quality condition of the communication link to the communication satellite, and if all the original information packets are recovered, not starting a feedback mechanism;
and S15, if the communication satellite receives the feedback information, dynamically adjusting fountain code encoding parameters in real time according to the quality condition of the communication link, and starting a retransmission mechanism.
As a technical optimization scheme of the present invention, the specific encoding method in S12 includes:
s121, constructing a full rank matrix A according to the code length K and the packet length L in the real-time coding parameters;
s122, performing inverse transformation on the construction matrix A, and performing precoding on an original information packet to obtain an intermediate coding packet C;
and S123, coding the intermediate code packet C by using a code generator to obtain a code packet to be sent.
As a technical optimization scheme of the present invention, the step S14 further includes creating a queue storing at most M data at the receiving end, for storing the packet loss rate of each data block; the queue is set to
And if the original information packet cannot be completely recovered after the data are received, calculating the average packet loss rate of the communication link, wherein Pi represents the packet loss rate of the ith data block, N represents the number of the data blocks, the maximum number is M, and feeding back the number of the data blocks needing to be retransmitted and the real-time packet loss rate Pt representing the quality condition of the communication link to the communication satellite.
As a technical optimization scheme of the present invention, in step S15, after the communication satellite receives the feedback information, the packet loss rate Pt representing the quality status of the communication link is obtained, and then the packet loss rate Pt is obtained according to a formula
And calculating and analyzing to obtain real-time fountain code coding redundancy, wherein beta is the fountain code coding redundancy, beta' represents the fountain code coding redundancy under the allowable decoding failure probability, and after the real-time fountain code coding redundancy is obtained through calculation and analysis, the fountain code coding parameters are adjusted in real time, and the data blocks needing to be retransmitted are coded and retransmitted.
As a technical optimization scheme of the present invention, a specific method for establishing a communication connection between one of the communication satellites and the vehicle-mounted intelligent terminal according to a communication link scheduled by the ground communication control center includes:
s21, receiving a communication request of the vehicle-mounted intelligent terminal requesting communication, and positioning the geographic position of the vehicle-mounted intelligent terminal according to the positioning module;
and S22, the ground communication control center determines the access communication satellite of the vehicle-mounted intelligent terminal by utilizing a preset closest distance access strategy based on the acquired geographic position information of the plurality of communication satellites and the geographic position information of the vehicle-mounted intelligent terminal.
As a technical optimization scheme of the present invention, the specific method for acquiring the geographic position information of the plurality of communication satellites in S22 includes:
s31, according to the longitude and latitude of the communication satellite, calculating a mapping latitude corresponding to the communication satellite when the communication satellite is mapped to the earth meridian by using a preset longitude and latitude mapping formula, and determining the communication satellite as an orbit reference satellite;
s32, calculating to obtain the mapping latitude of the adjacent satellites in the same orbit of the orbit reference satellite according to the mapping latitude of the orbit reference satellite and a first preset latitude difference value between the orbit reference satellite and the adjacent satellites in the same orbit, and calculating to obtain the longitude and latitude of the adjacent satellites in the same orbit by using a preset longitude and latitude reflection equation according to the mapping latitude of the adjacent satellites in the same orbit and a preset deflection angle between a satellite orbit and an earth meridian;
s33, judging whether the longitude and latitude of all satellites in the same orbit with the communication satellite are obtained or not, if the longitude and latitude of all satellites in the same orbit with the communication satellite are obtained, recording the obtained longitude and latitude of all satellites in the same orbit with the communication satellite, and taking all satellites in the orbit where the communication satellite is located as network reference satellites;
s34, calculating mapping latitudes of all satellites on a second orbit which is adjacent to the first orbit in an abnormal orbit according to the mapping latitudes of all network reference satellites and a second preset latitude difference value between each network reference satellite and an adjacent satellite in the abnormal orbit, wherein the first orbit is an orbit in which each network reference satellite is located, and calculating the longitude and latitude of all satellites on the second orbit by using a preset longitude and latitude reflection formula according to the mapping latitudes of all satellites on the second orbit and a preset deflection angle between a satellite orbit and an earth meridian;
s35, judging whether the longitude and latitude of all the satellites in the different orbits with the communication satellite are obtained, and recording the obtained longitude and latitude of all the satellites in the different orbits with the satellite if the longitude and latitude of all the satellites in the different orbits with the satellite are obtained.
As a technical optimization scheme of the present invention, the specific method for determining, by using a preset closest distance access policy in S22, that the access communication satellite of the vehicle-mounted intelligent terminal includes:
s41, calculating to obtain the distance between each communication satellite and the vehicle-mounted intelligent terminal by using a preset nearest distance calculation formula based on the acquired geographic position information of the plurality of communication satellites and the geographic position information of the vehicle-mounted intelligent terminal;
wherein the predetermined closest distance is calculated by the formula
dnR is the radius of the earth and h is the distance between each communication satellite and the vehicle-mounted intelligent terminalnIs the altitude, beta, of satellite nnThe elevation angle of the satellite n is obtained by utilizing a preset satellite elevation angle calculation formula;
wherein the preset calculation formula of the satellite elevation angle is
And S42, judging whether the distance between the communication satellite and the vehicle-mounted intelligent terminal is minimum, and if so, determining that the communication satellite is the access satellite of the vehicle-mounted intelligent terminal.
In summary, the present invention schedules the communication link of the vehicle-mounted intelligent terminal through the ground communication control center according to the position located by the positioning module, so that one of the communication satellites is in communication connection with the vehicle-mounted intelligent terminal according to the communication link scheduled by the ground communication control center, sends the weather hydrological data file to the vehicle-mounted intelligent terminal, and encodes, transmits and decodes the weather hydrological data file sent to the vehicle-mounted intelligent terminal by the communication satellite through the coding and decoding module, and can adaptively select the optimal communication satellite, so that good communication quality is always maintained, the problem of poor communication quality after the vehicle enters a remote mountain area is solved, the transmission accuracy of the message data is improved, the original encoding performance can be maintained, the problems of extension during the transmission of the satellite communication link, easy signal fading and high error rate are solved, and the coding and decoding overhead is greatly reduced, the decoding success rate is improved.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. On-vehicle intelligent satellite meteorological hydrology communication system, its characterized in that includes:
the vehicle-mounted intelligent terminal is arranged on a vehicle;
the power supply module is electrically connected with the vehicle-mounted intelligent terminal and is used for supplying power to the vehicle-mounted intelligent terminal;
the positioning module is arranged on the vehicle-mounted intelligent terminal and is used for positioning the position of the vehicle-mounted intelligent terminal;
the ground communication control center is in data communication connection with the vehicle-mounted intelligent terminal through a wireless network, and is used for scheduling a communication link of the vehicle-mounted intelligent terminal according to the position positioned by the positioning module;
the communication satellites are all in communication connection with the ground communication control center, one of the communication satellites is in communication connection with the vehicle-mounted intelligent terminal according to a communication link scheduled by the ground communication control center, and the communication satellites are used for sending weather hydrological data files to the vehicle-mounted intelligent terminal;
and the coding and decoding module is respectively arranged on the vehicle-mounted intelligent terminal and the plurality of communication satellites and is used for coding, transmitting and decoding the meteorological hydrological data file sent to the vehicle-mounted intelligent terminal by the communication satellites.
2. The vehicle-mounted intelligent satellite weather hydrological communication system according to claim 1, wherein: the positioning module comprises a GPS module and a Beidou positioning module.
3. The vehicle-mounted intelligent satellite weather hydrological communication system according to claim 1, wherein: the power module comprises a storage battery and a power interface, the storage battery and the power interface are respectively electrically connected with the vehicle-mounted intelligent terminal, the power interface is used for the vehicle-mounted intelligent terminal to obtain power from a vehicle, and the storage battery is used for providing standby power for the vehicle-mounted intelligent terminal.
4. The vehicle-mounted intelligent satellite weather hydrological communication system according to claim 1, wherein: the specific method for encoding, transmitting and decoding the meteorological hydrological data file sent to the vehicle-mounted intelligent terminal by the encoding and decoding module comprises the following steps:
s11, segmenting the sent files to form original information groups;
s12, fountain code coding is carried out on the original information packet to form a coding packet;
s13, sending the code packet to the vehicle-mounted intelligent terminal through a communication link, and decoding the fountain codes after the vehicle-mounted intelligent terminal receives enough data packets;
s14, if all original information packets cannot be recovered, feeding back the number of the data block to be retransmitted and the quality condition of the communication link to the communication satellite, and if all the original information packets are recovered, not starting a feedback mechanism;
and S15, if the communication satellite receives the feedback information, dynamically adjusting fountain code encoding parameters in real time according to the quality condition of the communication link, and starting a retransmission mechanism.
5. The vehicle-mounted intelligent satellite weather hydrological communication system according to claim 4, wherein: the specific encoding method in S12 includes:
s121, constructing a full rank matrix A according to the code length K and the packet length L in the real-time coding parameters;
s122, performing inverse transformation on the construction matrix A, and performing precoding on an original information packet to obtain an intermediate coding packet C;
and S123, coding the intermediate code packet C by using a code generator to obtain a code packet to be sent.
6. The vehicle-mounted intelligent satellite weather hydrological communication system according to claim 4, wherein: the step S14 further includes creating a queue storing at most M data at the receiving end, for storing the packet loss rate of each data block; the queue is set to
If the original information packet can not be completely recovered after the data is received, calculating the average packet loss rate of the communication link, wherein PiIndicating a loss of the ith data blockAnd (4) the packet rate, wherein N represents the number of data blocks, the maximum is M, and the number of the data blocks needing to be retransmitted and the real-time packet loss rate Pt representing the quality condition of the communication link are fed back to the communication satellite together.
7. The vehicle-mounted intelligent satellite weather hydrological communication system according to claim 6, wherein: in step S15, after receiving the feedback information, the communication satellite obtains the packet loss rate Pt representing the quality status of the communication link, and then obtains the packet loss rate Pt according to a formula
And calculating and analyzing to obtain real-time fountain code coding redundancy, wherein beta is the fountain code coding redundancy, beta' represents the fountain code coding redundancy under the allowable decoding failure probability, and after the real-time fountain code coding redundancy is obtained through calculation and analysis, the fountain code coding parameters are adjusted in real time, and the data blocks needing to be retransmitted are coded and retransmitted.
8. The vehicle-mounted intelligent satellite weather hydrological communication system according to claim 1, wherein: the specific method for establishing the communication connection between one communication satellite and the vehicle-mounted intelligent terminal according to the communication link scheduled by the ground communication control center comprises the following steps:
s21, receiving a communication request of the vehicle-mounted intelligent terminal requesting communication, and positioning the geographic position of the vehicle-mounted intelligent terminal according to the positioning module;
and S22, the ground communication control center determines the access communication satellite of the vehicle-mounted intelligent terminal by utilizing a preset closest distance access strategy based on the acquired geographic position information of the plurality of communication satellites and the geographic position information of the vehicle-mounted intelligent terminal.
9. The vehicle-mounted intelligent satellite weather hydrological communication system according to claim 8, wherein: the specific method for acquiring the geographical location information of the plurality of communication satellites in S22 includes:
s31, according to the longitude and latitude of the communication satellite, calculating a mapping latitude corresponding to the communication satellite when the communication satellite is mapped to the earth meridian by using a preset longitude and latitude mapping formula, and determining the communication satellite as an orbit reference satellite;
s32, calculating to obtain the mapping latitude of the adjacent satellites in the same orbit of the orbit reference satellite according to the mapping latitude of the orbit reference satellite and a first preset latitude difference value between the orbit reference satellite and the adjacent satellites in the same orbit, and calculating to obtain the longitude and latitude of the adjacent satellites in the same orbit by using a preset longitude and latitude reflection equation according to the mapping latitude of the adjacent satellites in the same orbit and a preset deflection angle between a satellite orbit and an earth meridian;
s33, judging whether the longitude and latitude of all satellites in the same orbit with the communication satellite are obtained or not, if the longitude and latitude of all satellites in the same orbit with the communication satellite are obtained, recording the obtained longitude and latitude of all satellites in the same orbit with the communication satellite, and taking all satellites in the orbit where the communication satellite is located as network reference satellites;
s34, calculating mapping latitudes of all satellites on a second orbit which is adjacent to the first orbit in an abnormal orbit according to the mapping latitudes of all network reference satellites and a second preset latitude difference value between each network reference satellite and an adjacent satellite in the abnormal orbit, wherein the first orbit is an orbit in which each network reference satellite is located, and calculating the longitude and latitude of all satellites on the second orbit by using a preset longitude and latitude reflection formula according to the mapping latitudes of all satellites on the second orbit and a preset deflection angle between a satellite orbit and an earth meridian;
s35, judging whether the longitude and latitude of all the satellites in the different orbits with the communication satellite are obtained, and recording the obtained longitude and latitude of all the satellites in the different orbits with the satellite if the longitude and latitude of all the satellites in the different orbits with the satellite are obtained.
10. The vehicle-mounted intelligent satellite weather hydrological communication system according to claim 8, wherein: in S22, the specific method for determining that the vehicle-mounted intelligent terminal accesses the communication satellite by using the preset closest distance access policy includes:
s41, calculating to obtain the distance between each communication satellite and the vehicle-mounted intelligent terminal by using a preset nearest distance calculation formula based on the acquired geographic position information of the plurality of communication satellites and the geographic position information of the vehicle-mounted intelligent terminal;
wherein the predetermined closest distance is calculated by the formula
dnR is the radius of the earth and h is the distance between each communication satellite and the vehicle-mounted intelligent terminalnIs the altitude, beta, of satellite nnThe elevation angle of the satellite n is obtained by utilizing a preset satellite elevation angle calculation formula;
wherein the preset calculation formula of the satellite elevation angle is
And S42, judging whether the distance between the communication satellite and the vehicle-mounted intelligent terminal is minimum, and if so, determining that the communication satellite is the access satellite of the vehicle-mounted intelligent terminal.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202918292U (en) * | 2012-10-09 | 2013-05-01 | 大连大学 | Satellite access selecting device for LEO (Low Earth Orbit) satellite communication network |
| CN105554059A (en) * | 2015-11-25 | 2016-05-04 | 北京华油信通科技有限公司 | Logistics transportation intelligent perception and position service system based on Beidou navigation technology |
| CN108390713A (en) * | 2018-02-08 | 2018-08-10 | 北京邮电大学 | The method of mobile communication and system of low orbit satellite communication networ network |
| CN109510687A (en) * | 2018-11-28 | 2019-03-22 | 南通先进通信技术研究院有限公司 | A kind of fountain code encoding method based on satellite communication |
| CN110337089A (en) * | 2019-08-05 | 2019-10-15 | 西安天宸量子通信技术有限公司 | A kind of vehicle-mounted internet-of-things terminal and its information transferring method |
-
2020
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202918292U (en) * | 2012-10-09 | 2013-05-01 | 大连大学 | Satellite access selecting device for LEO (Low Earth Orbit) satellite communication network |
| CN105554059A (en) * | 2015-11-25 | 2016-05-04 | 北京华油信通科技有限公司 | Logistics transportation intelligent perception and position service system based on Beidou navigation technology |
| CN108390713A (en) * | 2018-02-08 | 2018-08-10 | 北京邮电大学 | The method of mobile communication and system of low orbit satellite communication networ network |
| CN109510687A (en) * | 2018-11-28 | 2019-03-22 | 南通先进通信技术研究院有限公司 | A kind of fountain code encoding method based on satellite communication |
| CN110337089A (en) * | 2019-08-05 | 2019-10-15 | 西安天宸量子通信技术有限公司 | A kind of vehicle-mounted internet-of-things terminal and its information transferring method |
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Application publication date: 20210511 |