A multi-ais message demodulation method suitable for satellite reception

A technology of satellite reception and demodulation method, which is applied in the field of multiple AIS message demodulation suitable for satellite reception, can solve the problems that the position of the frame head and frame tail is difficult to judge, and weak signals cannot be demodulated, so as to reduce the difficulty of judgment and improve the demodulation process. precise effect

Active Publication Date: 2018-12-21
XIAN INSTITUE OF SPACE RADIO TECH
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Problems solved by technology

[0006] The technical problem solved by the present invention is: aiming at the deficiencies of the prior art, a multiple AIS message demodulation method suitable for satellite reception is provided, and under the condition that there are multiple message collisions in the AIS message received by the satellite, the frame error caused by the message collision is solved. It is difficult to judge the position of the head frame and the tail and the problem that the weak signal cannot be demodulated. Finally, the overlapping multi-channel AIS signals with different strengths are demodulated.

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  • A multi-ais message demodulation method suitable for satellite reception
  • A multi-ais message demodulation method suitable for satellite reception

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Embodiment Construction

[0021] The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0022] Such as figure 1 , 2 Described, a kind of multiple AIS message demodulation method suitable for satellite reception of the present invention is characterized in that the steps are as follows:

[0023] (1) After using the input sample value cache to store enough complex baseband signal samples in the form of I and Q, start sampling values ​​from the initial position A of the sliding window, and take out samples of N symbol times in total for one demodulation, Where N is a positive integer, representing the length of a sliding window;

[0024] (2) For the samples of a total of L symbol times from position A+M to position A+M+L-1, use the joint parameter estimation method to estimate the timing offset and carrier frequency offset, and use the parameter estimation results to estimate the entire sliding The signal in the window performs symbo...

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Abstract

The invention devices a multi-AIS message demodulation method applicable to satellite reception. A demodulation processing method based on a slide window is adopted; the problem that the starting and ending locations of a signal frame are difficult in judgment resulted from multi-AIS message collision is overcome; a normal method of judging a frame header before demodulation is changed into a method of searching the frame header and a frame tail after obtaining a bit sequence through demodulation; therefore, the judgment difficulty of the frame header and the frame tail is greatly reduced; stack architecture assisted multi-demodulation control is adopted; under a condition of multi-AIS message collision, multi-way signals are demodulated successfully; the frames desired to be demodulated are all demodulated; and the demodulation method is low in operation complexity and is applicable to on-satellite real time processing.

Description

technical field [0001] The invention relates to a method for demodulating multiple AIS (Automatic Identification System) messages suitable for satellite reception, in particular to a multiple message demodulation method for low-orbit (LEO) satellites receiving AIS signals, which can be used in simple receivers Antenna in the spaceborne AIS receiving system. Background technique [0002] With the process of global economic integration and the rapid growth of maritime transportation and trade, it is urgent to create a system to realize the monitoring of global sea areas and improve the safety of maritime transportation. The traditional ground / sea AIS system has a short transmission distance and cannot realize long-distance eye surveillance. Satellite coverage is wide, and the space-borne AIS system can realize the monitoring of sea areas around the world, which has attracted the attention of various countries in recent years. [0003] One of the main technical difficulties i...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00H04L27/00H04B7/185
CPCH04B7/18582H04L1/0048H04L27/0014H04L2027/0026
Inventor 王大庆徐烽惠腾飞龚险峰刘明洋
Owner XIAN INSTITUE OF SPACE RADIO TECH
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