Time slot synchronization method for TDMA/MF-TDMA satellite communication system

A technology of MF-TDMA and satellite communication systems, applied in the field of time slot synchronization of TDMA/MF-TDMA satellite communication systems, can solve problems such as increasing system design complexity, and achieve the effect of reducing complexity

Pending Publication Date: 2022-08-05
西安言集傲威信息科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most TDMA satellite communication systems use Beidou or GPS timing positioning, or use an independent calibration station to complete the problem of time slot synchronization, which requires an independent channel to complete the analysis of Beidou / GPS / calibration station signals. This will undoubtedly increase the complexity of the system design

Method used

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  • Time slot synchronization method for TDMA/MF-TDMA satellite communication system
  • Time slot synchronization method for TDMA/MF-TDMA satellite communication system
  • Time slot synchronization method for TDMA/MF-TDMA satellite communication system

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Embodiment 1

[0034] The invention discloses a time slot synchronization method of a TDMA satellite communication system assisted by a central station. The time slot synchronization process is divided into two stages: an initial synchronization stage and a time slot synchronization maintenance stage. The initial synchronization stage adopts a random competition mechanism. In the slot synchronization maintaining stage, the strategy of sending periodically is adopted; the overall processing flow is as follows: Figure 4 shown, including:

[0035] Step S1, taking the time of the central station as the benchmark, the central station uses the forward link to provide timing for each remote station through TOD frames, and aligns the time of each remote station with the time of the central station, so that each remote station and the central station are aligned. be consistent in time;

[0036] In step S2, the path delay of each remote station is calculated by means of an auxiliary closed loop of t...

Embodiment 2

[0039] The time slot synchronization method of the TDMA / MF-TDMA satellite communication system in this embodiment is different from Embodiment 1 in that further: in step S2, in the initial synchronization stage, the return burst of the remote station is scheduled in a frame as a time unit, The remote station sends a TDMA synchronization frame at a random time in each scheduling period; after the central station receives the TDMA synchronization frame sent by the remote station, it will capture the TOD count value of the TDMA synchronization frame as the central station's reception time Stamp, fill in the TDMA synchronization frame, and transmit back to the remote station through the forward link; after the remote station receives the synchronization frame returned by the central station, the remote station in the TDMA synchronization frame sends the time stamp and the central station. The path delay is calculated from the receiving time, and the time of each burst of the remote...

Embodiment 3

[0041] The time slot synchronization method of the TDMA / MF-TDMA satellite communication system in this embodiment is different from Embodiment 1 and Embodiment 2 in that further: in step S3, in the time slot synchronization maintaining stage, the remote station periodically Periodically send a TDMA synchronization frame on its allocated time slot. The transmission method of the TDMA synchronization frame is similar to the initial time slot synchronization stage, and a new path delay L is obtained. RTT , maintain the local frame number and time slot number according to the updated path delay, so as to solve the change of the path delay caused by the difference of motion and crystal oscillator of the remote station, the central station and the remote station have been maintained in time Synchronize.

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Abstract

The invention discloses a time slot synchronization method for a TDMA / MF-TDMA satellite communication system, and the method comprises the steps: employing a random competition mechanism in an initial synchronization stage, and employing a timing period transmission strategy in a time slot synchronization maintenance stage; the method comprises the following steps: S1, taking the time of a central station as a reference, and enabling the central station to use a forward link to time each far-end station through a TOD frame, so that each far-end station and the central station are kept unified in time; s2, calculating the path time delay of each far-end station in a mode of assisting a closed loop by the central station, and enabling each far-end station to complete burst communication in the time slot distributed by the far-end station; and S3, in a time slot synchronization keeping stage, the far-end station calculates a current frame number and a time slot number according to the local TOD counter value and the path time delay, and carries out service burst communication on the distributed time slot. The time slot synchronization of the system does not depend on the position information of the far-end station, a third-party time service system does not need to carry out time service, the TDMA synchronization frame carries out data communication in a channel associated service mode, and the design complexity of a satellite communication system can be effectively reduced.

Description

technical field [0001] The invention relates to satellite communication technology, in particular to a technology and scheme for time slot synchronization of a TDMA / MF-TDMA satellite communication system. Background technique [0002] Satellite communication is a communication method widely used in military and civilian use. In terms of access methods, the multiple access methods of satellite communication mainly include time division multiple access (TDMA), frequency division multiple access (FDMA), Code Division Multiple Access (CDMA), etc. Among them, TDMA is an important communication system in current satellite communication. TDMA satellite communication system is mainly composed of central station, high-throughput satellite and remote station, such as figure 1 shown. In terms of communication links, TDMA satellite communication systems are generally divided into forward links and return links. The forward link refers to the communication link from the central statio...

Claims

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Application Information

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IPC IPC(8): H04W56/00H04J3/06H04B7/185
CPCH04W56/0015H04W56/0045H04J3/0655H04B7/18515Y02D30/70
Inventor李晓龙秦龙龙闫健康
Owner西安言集傲威信息科技有限公司