Disclosure of Invention
In view of the above, the invention provides a reliable multi-station collaborative distribution method and system for complex multi-scene satellite communication. The invention realizes the satellite broadcast information service with high reliability and strong guarantee through multidimensional compensation of variable rate, multi-carrier, multi-path and the like based on the traditional TDMA technology and the variable rate communication technology, and is suitable for various communication scenes with priority guarantee of communication reliability and communication efficiency.
The purpose of the invention is realized in the following way:
A reliable multi-station collaborative distribution method for complex multi-scene satellite communication, which uses different speed and time slot to multiplex a multi-speed TDMA broadcast carrier wave to form a broadcast network by a control center to control a plurality of broadcasting stations in different places, thereby carrying out broadcast distribution on a plurality of receiving stations in different places, comprises the following steps:
Step 1, a control center performs network planning according to task requirements to generate selectable broadcasting stations and network parameters, wherein the network parameters comprise communication satellite resources, task carrier parameters, a frame structure and initial time, the task carrier parameters comprise carrier numbers, center frequencies, carrier bandwidths and transmission power, and the frame structure comprises frame lengths, unique codes and time slot numbers;
Step 2, the control center sequentially interacts with the selectable broadcasting stations to confirm whether the selectable broadcasting stations are available, and if so, network parameters are issued until enough broadcasting stations are selected;
Step 3, after the broadcasting station receives the network parameters issued by the control center, self-ranging is carried out on the task carrier wave, the satellite signal loop-back time of the station is determined, time synchronization is completed by combining the Beidou time information, and then, status reporting is carried out to the control center;
Step 4, after receiving the status report information of each broadcasting station, the control center carries out frame planning calculation to generate a TDMA frame planning configuration file of each task carrier, wherein the TDMA frame planning configuration file comprises the number, the sequence and the speed of the TDMA time slots and the corresponding broadcasting stations;
Step5, after receiving the TDMA frame plan configuration file of the control center, the broadcasting station sends data on the allocated time slot according to the TDMA frame plan configuration file to carry out broadcasting distribution;
And 6, after the receiving station is powered on and started, manually carrying out parameter filling, filling the task carrier parameters into the receiving station, initializing the receiving station according to the task carrier parameters, then capturing signals at the lowest carrier rate of the task carrier, after capturing the signals, determining the receiving carrier rate of the receiving station according to the receiving signal-to-noise ratio, and carrying out data receiving at the receiving carrier rate of the task carrier.
Further, the method further comprises the following steps:
When broadcasting and distributing, the broadcasting station reports the running state information of the station to the control center, the control center monitors the state of each broadcasting station in real time, adjusts the running broadcasting network according to the need, monitors in real time and displays the comprehensive situation, and sends the adjusted TDMA frame planning configuration file to the broadcasting station, and the broadcasting station re-distributes the broadcasting according to the adjusted TDMA frame planning configuration file.
Further, the communication rate employed by each burst slot of the task carrier is variable, the communication rate being identified by unique code information in the frame structure.
Further, in step 3, the time synchronization is as follows:
The broadcasting station sends a ranging signal to the north bucket satellite on a task carrier wave, receives Beidou time information, measures the sending and receiving time difference and records the sending and receiving time difference as satellite signal loop-back time, wherein the Beidou time information comprises detailed time of second pulse and current second pulse;
when the second pulse is received, calculating the starting time of the N-th frame according to the detailed time, the frame length and the initial time of the current second pulse, subtracting half of the satellite signal loop-back time of the station on the basis of the starting time of the N-th frame, marking the half of the satellite signal loop-back time as the starting time of the N-th frame of the station, and realizing the time synchronization of the broadcasting station after finishing the confirmation of the starting time.
Further, the topology of the broadcast network includes:
(1) The receiving station receives information by preferentially working in a plurality of communication rate time slots in the carrier according to the real-time communication capacity of the receiving station, and balances the communication reliability and efficiency;
(2) The multi-carrier TDMA broadcasting network comprises a plurality of broadcasting stations, a receiving station, a communication system and a communication system, wherein the plurality of broadcasting stations use more than 2 variable rate TDMA broadcasting carriers to ensure one receiving station to form a multi-carrier TDMA broadcasting network of a multi-master station multi-rate pair single receiving station;
(3) The different receiving stations independently receive information according to the real-time communication capacity of the receiving stations, and balance the communication reliability and efficiency by preferentially working in a plurality of communication rate time slots of the carrier;
(4) The multiple receiving stations independently receive information according to the real-time communication capacity of the receiving stations, and balance communication reliability and efficiency by preferentially working in multiple communication rate time slots of the multiple carriers.
The complex multi-scene satellite communication reliable multi-station collaborative distribution system comprises a control center, a plurality of broadcasting stations in different places and a plurality of receiving stations in different places, wherein the broadcasting stations adopt different rates and different time slots under the control of the control center to multiplex one multi-rate TDMA broadcasting carrier wave to form a broadcasting network;
the system works as follows:
The control center performs network planning according to task requirements to generate selectable broadcasting stations and network parameters, wherein the network parameters comprise communication satellite resources, task carrier parameters, a frame structure and initial time, the task carrier parameters comprise carrier numbers, center frequencies, carrier bandwidths and transmission power, and the frame structure comprises frame lengths, unique codes and time slot numbers;
The control center sequentially interacts with the selectable broadcasting stations to confirm whether the selectable broadcasting stations are available, and if so, network parameters are issued until enough broadcasting stations are selected;
After receiving network parameters issued by a control center, a broadcasting station carries out self-ranging on a task carrier wave, determines satellite signal loop-back time of the station, completes time synchronization by combining Beidou time information, and then carries out state reporting to the control center;
After receiving the status report information of each broadcasting station, the control center carries out frame planning calculation to generate a TDMA frame planning configuration file of each task carrier, wherein the TDMA frame planning configuration file comprises the number, the sequence and the speed of the TDMA time slots and the corresponding broadcasting stations;
after receiving the TDMA frame planning configuration file of the control center, the broadcasting station sends data on the allocated time slot according to the TDMA frame planning configuration file to carry out broadcasting distribution;
After the receiving station is powered on and started, manually carrying out parameter filling, filling the task carrier parameters to the receiving station, initializing the receiving station according to the task carrier parameters, then capturing signals at the lowest carrier rate of the task carrier, after capturing the signals, determining the receiving carrier rate of the receiving station according to the receiving signal-to-noise ratio, and carrying out data receiving at the receiving carrier rate of the task carrier.
When broadcasting and distributing, the broadcasting station reports the running state information of the broadcasting station to the control center, the control center monitors the state of each broadcasting station in real time, adjusts the running broadcasting network according to the requirement, monitors in real time and displays the comprehensive situation, and sends the adjusted TDMA frame plan configuration file to the broadcasting station, and the broadcasting station re-distributes the broadcasting according to the adjusted TDMA frame plan configuration file.
Compared with the prior art, the invention has the following advantages:
1. the invention realizes that a plurality of broadcasting stations multiplex one multi-rate TDMA broadcasting carrier by adopting different rates and different time slots through the variable-rate TDMA carrier, and realizes the efficient collaborative operation of the multi-broadcasting stations in different places by uniformly planning and real-time control distribution of system communication resources such as carrier frequencies, carrier rates, working time slots and the like of the broadcasting stations in different places through the control center.
2. The invention realizes the transformation from the traditional satellite broadcasting system of 'single-master-station single-rate single-carrier star network' to the TDMA satellite broadcasting system of 'multi-master-station multi-rate single-carrier multi-to-one', 'multi-master-station multi-rate multi-carrier multi-to-one', 'multi-master-station multi-rate single-carrier star network', 'multi-master-station multi-rate multi-carrier star network', and the like.
3. The invention can overcome the adverse effect of communication link deterioration caused by known and unknown reasons, is suitable for various satellite broadcast communication application scenes with high reliability requirements, can give consideration to communication efficiency while guaranteeing communication reliability preferentially, and realizes the dynamic balance of optimal-rate high-efficiency reception and minimum-rate reliable reception.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
The system comprises a control center, a plurality of broadcasting station systems in different places and a plurality of receiving stations in different places, wherein the broadcasting stations adopt different rates and different time slots under the control of the control center, multiplex one multi-rate TDMA broadcasting carrier wave to form a broadcasting network, and realize high reliability and strong guarantee of satellite broadcasting information services of remote user stations with different communication capacities. Wherein:
The control center is a network planning and control center, performs unified network parameter planning on the task broadcasting network according to the use requirement, issues parameters to each task broadcasting site and controls the network to be opened, and performs real-time control, state monitoring and comprehensive situation presentation on the running network and equipment. Wherein the network planning parameters include the broadcasting station used, the satellite transponder, the number of carriers, the carrier rate, the carrier time slots, etc.
The broadcasting stations comprise a plurality of stations distributed at different places, and under the unified organization of the control center, the plurality of broadcasting stations are multiplexed based on carrier time slots with different rates, so that variable rate TDMA carrier signal transmission of a system core is realized.
The receiving station enables reception of a variable rate TDMA carrier signal.
The reliable multi-station collaborative distribution method for complex multi-scene satellite communication is shown in fig. 4, and comprises the following steps:
(1) The control center performs network planning according to the input use requirement to generate selectable broadcasting stations and network planning parameters, wherein the network planning parameters comprise communication satellite resources, task carrier parameters, a frame structure and initial time, the task carrier parameters comprise carrier numbers, center frequencies, carrier bandwidths, transmission power and the like, and the frame structure comprises frame lengths, time slot numbers and the like;
The communication rate adopted by each burst slot of the task carrier is not necessarily the same, and variable rate identification is realized by the variable rate burst slot frame through unique code information in the burst frame structure, as shown in fig. 3.
(2) The control center sequentially interacts with the selectable broadcasting stations to confirm whether the broadcasting stations are available, and if so, network planning parameters are issued until enough broadcasting stations are selected;
(3) After receiving the issued network planning parameters, the broadcasting station determines satellite signal Round Trip Time (RTT) of the broadcasting station through self-ranging on a task carrier wave, completes time synchronization by combining with Beidou time information, and reports the state to a control center after completion;
The time synchronization implementation mode comprises the steps of sending a ranging signal on a task carrier by a broadcasting station, receiving the ranging signal, measuring a sending and receiving time difference and recording the time difference as satellite signal loop-back time, wherein the Beidou time information comprises detailed time of second pulse and current second pulse, calculating the starting time of an N-th frame according to the detailed time, frame length and initial time of the current second pulse when the second pulse is received, subtracting half of the satellite signal loop-back time of the station on the basis of the starting time of the N-th frame and recording the starting time of the N-th frame of the station as the starting time of the N-th frame of the station, and completing the time synchronization of the station after completing the confirmation of the starting time;
(4) After receiving the status report information of each broadcasting station, the control center performs frame planning calculation to generate a TDMA frame planning configuration file of each task carrier, wherein the TDMA frame planning configuration file comprises the number, the sequence and the speed of the TDMA time slots and the corresponding broadcasting stations, and after the calculation is completed, the control center issues the generated TDMA frame planning configuration file to the relevant broadcasting stations to organize a plurality of broadcasting stations to execute the opening of one or a plurality of variable speed TDMA satellite broadcasting networks;
(5) After receiving the frame plan of the control center, the broadcasting station sends data on the time slot allocated to the broadcasting station according to the frame plan, and performs broadcasting distribution;
(6) After the user station is powered on and started, manually performing parameter filling, filling task carrier information into the user station, initializing the user station according to filling parameters, capturing signals at the lowest carrier rate of the task carrier, determining the receiving carrier rate of the user station according to the receiving signal-to-noise ratio after capturing the signals, and receiving data at the receiving carrier rate of the task carrier;
(7) When broadcasting and distributing, the broadcasting station reports the running information and other states of the broadcasting station to the control center, the control center monitors the states of the broadcasting stations in real time, adjusts the running network according to the need, monitors in real time and displays the comprehensive situation, and sends the adjusted frame plan to the broadcasting station, and the broadcasting station re-distributes the broadcasting according to the adjusted frame plan.
The system supports a TDMA broadcast network which forms different topological structures, is applicable to different application scenes, as shown in figure 2, and comprises:
(1) The multiple broadcasting stations use single variable rate TDMA broadcasting carrier to ensure one receiving station to form a multi-carrier TDMA broadcasting network of multi-station multi-rate to one-station (single receiving station), and the receiving stations receive information by preferentially working in a plurality of communication rate time slots in the carrier according to the real-time communication capability of the receiving stations, so that the communication reliability and efficiency are balanced.
(2) The multiple broadcasting stations use more than 2 variable rate TDMA broadcasting carriers to ensure one receiving station to form a multi-carrier TDMA broadcasting network of multiple (multiple main stations and multiple rates) to one (single receiving station), and the receiving stations receive information by preferentially working in multiple communication rate time slots in multiple carriers according to the real-time communication capability of the receiving stations, so that the communication reliability and efficiency are further balanced.
(3) The multiple broadcasting stations use single variable rate TDMA broadcasting carrier to ensure multiple receiving stations to form a multi-carrier TDMA broadcasting network of multiple (multi-master station and multiple rate) to multiple (multi-receiving station), and different receiving stations independently receive information according to their own real-time communication capability by preferentially working in multiple communication rate time slots in the carrier, so as to balance communication reliability and efficiency.
(4) The multiple broadcasting stations use more than 2 variable rate TDMA broadcasting carriers to ensure multiple receiving stations to form a multi-carrier TDMA broadcasting network of multiple (multiple main stations and multiple rates) to multiple (multiple receiving stations), and the multiple receiving stations independently receive information according to the real-time communication capability of the multiple receiving stations by preferentially working in multiple communication rate time slots in the multiple carriers, so that the communication reliability and efficiency are further balanced.
The invention is based on Beidou unified time reference and combines with broadcast station ranging to achieve the aim of time synchronization of multiple broadcast stations, realizes multipath guarantee of multiple broadcast stations to single user station, solves the system failure caused by faults, rain fade and the like of a single broadcast station system, effectively compensates the reliability of the single broadcast station, realizes multiplexing of one variable rate TDMA carrier wave by the multiple broadcast stations by different rates and different time slots through the design of a variable rate TDMA frame structure, effectively compensates the receiving capability difference of the multiple user stations, realizes simultaneous multiplexing of the multiple TDMA carrier waves through unified planning of a control center, and compensates the broadcasting capacity of the system.
The invention realizes the efficient and collaborative reliable data distribution of the multi-broadcasting stations by multi-dimensional compensation of multipath, variable rate, multi-carrier and the like and by combining with the unified planning and control of the control center, can adapt to various complex application scenes of multi-master station multi-rate single-carrier and multi-master station multi-rate multi-carrier of a single receiving station, and is particularly suitable for broadcasting distribution application with high reliable requirements.