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Satellite communication uplink closed-loop timing synchronization method based on synchronization frame

A technology of timing synchronization and satellite communication, which is applied in the field of satellite communication to achieve the effect of reducing the impact

Active Publication Date: 2019-12-20
成都天奥集团有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the uplink timing synchronization problem in the multi-carrier system satellite communication system, the present invention proposes an uplink closed-loop timing synchronization method based on a synchronization frame

Method used

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  • Satellite communication uplink closed-loop timing synchronization method based on synchronization frame

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Embodiment 1

[0035] Step 1: Estimate the transmission delay range of the cell, divide synchronization frames on the basis of downlink transmission frames, and group them in units of N frames. The fixed position in each synchronization frame is filled with the synchronization frame number n, n=1, 2, ..., N, the selection criterion of N: the duration of N synchronization frames is greater than the maximum round-trip transmission delay of terminals in the cell. The gateway station periodically sends a synchronization frame, and the sending time of the synchronization frame numbered 1 is recorded as T 0 ;

[0036] Step 2: Terminal 2 performs downlink synchronization, and in the case of a random access requirement, detects a synchronization signal frame numbered 1 to trigger an uplink random access signal transmission process.

[0037] Step 3: The transmission timing of the gateway station synchronous frame group is as follows Figure 5 As shown, at time T1, the gateway station receives an up...

Embodiment 2

[0051] Implementation example 2: Considering the satellite communication system deployed in our country covering Asia, the ground is in different locations, such as Beijing, Guangzhou, and Lhasa, and three gateway stations are deployed as the ground control nodes of the satellite. Assuming that 60 near-Earth polar satellites are launched, the orbital height is 1175km, and the satellite radial velocity is 6.1km / s to realize the satellite communication system covering Asia. The patent of the present invention will now be described by taking the Beijing gateway station G1 and the cell covered by the beam of the connected satellite S1 as an example. In this example, it includes: the gateway station G1 on the ground, the satellite S1 in space orbit, and the terminal 1 and terminal 2 within the coverage of the satellite beam as examples to illustrate the patent of the invention:

[0052] Step 1: The gateway station establishes a connection with the satellite: 1, and the satellite S1...

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Abstract

The invention discloses a satellite communication uplink closed-loop timing synchronization method based on a synchronization frame, and relates to the field of satellite communication. The method mainly comprises the steps of downlink synchronization frame grouping, uplink transmission time delay calculation, cell public transmission time delay calculation, ephemeris-based uplink data arrival satellite moment prediction, ephemeris-based uplink transmission time delay offset and cell public time delay offset calculation, and uplink transmission time delay adjustment amount calculation and issuing. Compared with the prior art, for a multi-carrier system satellite communication system, the influence of transmission delay on uplink time synchronization can be effectively reduced, and the timing synchronization precision is high; a closed-loop timing synchronization method is adopted and is compatible with a traditional ground mobile communication system uplink timing synchronization method.

Description

technical field [0001] The invention relates to the field of satellite communication, in particular to an uplink closed-loop timing synchronization method based on a synchronization frame. [0002] technical background [0003] The satellite communication system has the characteristics of long-distance transmission and high dynamics, which brings many challenges to the system design. For the satellite communication system using the multi-carrier system, the uplink synchronization tracking problem of the ground terminal in the system needs to be solved. Since the distance between the ground terminal and the satellite is not equal and changes in real time, if different terminals send uplink data at the same time, the time when the gateway station receives the signals of different terminals is different. At this time, according to the distance between the ground terminal and the satellite, it is necessary to adjust the timing advance of the signal transmitted by the ground termi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W56/00
CPCH04W56/0005H04W56/001H04W56/004H04W56/009
Inventor 马松刘田张毅夏斌李成
Owner 成都天奥集团有限公司
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