Wide and narrow beam cooperative satellite-borne AIS message real-time receiving and processing system

Abstract

The invention provides a wide and narrow beam cooperative satellite-borne AIS message real-time receiving and processing system, which comprises: a wide and narrow beam cooperative module, wherein a plurality of VHF frequency-band antennas form an antenna array, multiple wave beams form a network to enabling the antenna array to form a plurality of wide and narrow beams to receive AIS signals; anda multi-channel parallel processing module which adopts a multi-channel AIS receiver, wherein each channel processes the AIS signal received by a single wave beam, filtering, amplification and sampling of the signal, demodulation of a message and extraction of important information of a ship are completed, and meanwhile, the multi-channel parallel processing module has a signal time slot conflictresolution capability. By means of simultaneous receiving of wide and narrow beams, multichannel parallel processing, on-board extraction of important information, synchronization of message second information and satellite time and the like, the system has the advantages of comprehensively improving the ship target detection rate, extracting ship simplification information, obtaining accurate timestamps of messages and the like.

Description

technical field [0001] The invention relates to the technical field of aerospace vehicles. Specifically, it relates to a system for receiving and processing space-borne AIS messages in real time with coordinated wide and narrow beams. Background technique [0002] Automatic Identification System (AIS system for short) refers to a new type of navigation aid system applied to maritime safety and communication between ship and shore, ship and ship. Adopt GMSK modulation, automatically and continuously send static data, navigation-related information and safety information, etc. in the VHF frequency band at sea in SOTDMA communication mode, and at the same time automatically receive these information from surrounding ships, and exchange information with coastal base stations. The SOTDMA protocol stipulates that each SOTDMA communication cell is limited to a range of about 20 nautical miles. In the same cell, the communication time slots between users do not overlap, so there wi...

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Problems solved by technology

However, its antenna beam coverage is fixed, and its adaptability to areas with different ship densities is not strong. At the same time, it does not have the ability to extract key information from messages, and its intelligence is low.

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