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Satellite group network time synchronization method based on cross-layer design

A technology of network time and cross-layer design, applied in the field of satellite communication, can solve the problems of inability to meet TDMA precise time synchronization and poor synchronization accuracy, and achieve the effect of solving multi-node synchronization problems, high synchronization accuracy, and avoiding synchronization signal conflicts

Active Publication Date: 2017-02-22
XIAN INSTITUE OF SPACE RADIO TECH
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Problems solved by technology

In the fast-sounding satellite cluster satellite networking project, the typical inter-satellite distance is 10-1300km, and the transmission rate is 128kbps-1kbps. Time synchronization between nodes is performed through frame interaction at the MAC layer. At such a low transmission rate, the synchronization accuracy will become Very poor, about 10us-1000us, which is far from meeting the needs of TDMA precise time synchronization

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  • Satellite group network time synchronization method based on cross-layer design
  • Satellite group network time synchronization method based on cross-layer design
  • Satellite group network time synchronization method based on cross-layer design

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Embodiment Construction

[0048] Such as figure 1 As shown, it is the processing flow of the cross-layer constellation network time synchronization method of the present invention, which specifically includes the following steps:

[0049] (1) Start the time synchronization function after each satellite node is turned on;

[0050] (2) On-orbit listening to the network synchronization status information broadcast by other satellite nodes. The network synchronization status information includes: node ID, reference node ID, clock level, synchronization slot occupancy status, etc.;

[0051] Among them, the node ID refers to the identification number of the own star itself, the reference node ID refers to the identification number of the satellite where the time reference of the whole network is located, and the clock level refers to the position of the own star in the time transfer, that is, the reference node clock level is 0, The clock level of the satellite node connected to him by one hop is 1, and so ...

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Abstract

The invention discloses a satellite group network time synchronization method based on a cross-layer design. A spread spectrum signal mechanism is employed in a physical layer. A clock difference between a son node and a father node is calculated in a semi-two-way inter-satellite distance measurement mode, thereby finishing high-precision time synchronization between the nodes. Network synchronization management is employed in an MAC layer, synchronization state information is broadcasted in a network and synchronization topology management is carried out. A time synchronization father node selection result is provided for the physical layer for inter-node synchronization, thereby finishing time synchronization among the nodes of the whole network. The method provided by the invention is applicable to inter-satellite time synchronization demands of various satellite groups; there is no special demand for a satellite system; the universality is high; the application range is wide; on-satellite processing is simple; and the method has good application prospect.

Description

technical field [0001] The invention belongs to the field of satellite communication, and relates to a satellite network time synchronization method, which can realize the time synchronization of satellite networking in a complex space environment, and is suitable for the application of inter-satellite time synchronization of various constellations. Background technique [0002] Inter-satellite network interconnection can maximize the service capability of the network, expand the service scope of the network, and effectively make up for various deficiencies in single-satellite in-orbit operation, thereby building a space service system with complete functions and stable performance. [0003] Compared with the previous constellations, the formation constellation requires more accurate mutual position measurement between the satellite platforms participating in the formation flight, and a more stable formation configuration. At the same time, due to the information exchange bet...

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Application Information

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IPC IPC(8): H04J3/06H04B7/185
CPCH04B7/18521H04J3/0638
Inventor 徐伟琳薛治纲马伟杜长刚惠蕾放宋桃桃
Owner XIAN INSTITUE OF SPACE RADIO TECH
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