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VDES communication method using quick satellite searching and on-satellite frequency offset processing

A communication method and frequency offset technology, applied in radio transmission systems, radio relay systems, active electrical relay systems, etc., can solve the problem of not considering frequency offset estimation errors, reduce frequency offset estimation errors, and ensure real-time the effect of reducing the final frequency offset estimation failure

Pending Publication Date: 2021-11-05
山东星通易航通信科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing literature and research have not considered the possibility of reducing the frequency offset estimation failure in communication and reducing the frequency offset estimation error by relaying on-board processing on low-orbit satellites.

Method used

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  • VDES communication method using quick satellite searching and on-satellite frequency offset processing
  • VDES communication method using quick satellite searching and on-satellite frequency offset processing
  • VDES communication method using quick satellite searching and on-satellite frequency offset processing

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Embodiment 1

[0031] Such as figure 1 As shown, a VDES communication method disclosed by the present invention utilizing fast satellite search and frequency offset processing on the satellite comprises the following steps:

[0032] Step 1: Geosynchronous satellites collect relevant data

[0033] Let the number of low-orbit satellites be M, and the number of ships be N; figure 2As shown, if the ship i among the N ships needs to send data to the ground receiving station, then the ship i needs to use low-orbit satellites to forward the data to the ground receiving station, where i∈{1, 2, ..., N} ; The ship i needs to first send its own position, navigation direction, navigation speed and service requirements information to high-orbit satellites, that is, geosynchronous satellites; all low-orbit satellites need to periodically report themselves to the geosynchronous satellites orbit, speed, and current location; geostationary satellites record and save this information;

[0034] Step 2: The...

Embodiment 2

[0046] Embodiment 2 (experimental example)

[0047] According to a kind of communication method that utilizes fast satellite search and on-board frequency offset processing disclosed by the present invention, a simulation experiment is carried out, and the frequency offset estimation with on-board frequency offset processing is compared with the traditional frequency offset estimation to illustrate the present invention. Feasibility and effectiveness of the inventive method.

[0048] In the simulation, the channel is set to AWGN channel, QPSK modulation, the orbit height of the low-orbit satellite is 600km, the training sequence length is 48bit, and the symbol duration is Seconds, in order to compare the frequency offset estimation with on-board frequency offset processing and the traditional frequency offset estimation, the total frequency offset of uplink and downlink is 500Hz, and the information transmission rate is 9600bit / s.

[0049] Simulation results such as Figure...

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Abstract

The invention relates to a VDES communication method using quick satellite searching and on-satellite frequency offset processing. The method comprises the following steps: a geostationary satellite collects related data; the geostationary satellite calculates the optimal access low-orbit satellite j * of the ship i; the ship i directly searches and accesses a satellite j *; the ship i sends data to the satellite j *, and the satellite j * carries out on-satellite frequency offset processing on the received data and forwards the processed data to the ground receiving station; and the ground receiving station performs frequency offset processing and judgment on the received data. Compared with the existing method for searching the low-orbit satellites in all directions and all elevation angles, the method disclosed by the invention has the advantages that the quick satellite searching of the ship can be realized, the communication access time delay is reduced, and the real-time performance of data transmission is ensured. Compared with the existing method for performing frequency offset estimation and correction only on the ground receiving station, the method disclosed by the invention has the advantages that the on-satellite frequency offset estimation and correction of the low-orbit satellite are added, the possibility of failure of final frequency offset estimation can be reduced, and the frequency offset estimation error can be reduced.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a VDES communication method utilizing fast satellite search and frequency offset processing on the satellite. Background technique [0002] With the prosperity of the maritime transportation industry, the demand for maritime communication is also increasing. The original automatic identification system (Automatic Identification System, AIS) will be congested and cannot meet the needs of diversified information transmission. Therefore, the International Association of Navigation Marks (International Association of Lighthouse Authorities, IALA) proposed VHF Data Exchange System (VHF Data Exchange System, VDES). VDES is a trinity global data exchange system of sea, land and air. Its air part is an air network composed of high-orbit satellites and low-orbit satellites. The high-orbit satellites refer to geosynchronous satellites, and VDES uses geosynchronou...

Claims

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Application Information

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IPC IPC(8): H04B7/185H04B7/19H04L29/08
CPCH04B7/18513H04B7/19H04L67/12Y02D30/70
Inventor 李洪星丁晓光
Owner 山东星通易航通信科技有限公司
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