FPGA (field programmable gate array)-based minisatellite-borne AIS (automatic identification system) signal acquisition system

Abstract

The invention provides an FPGA (field programmable gate array)-based minisatellite-borne AIS (automatic identification system) signal acquisition system. Ship AIS signals received by a VHF (very high frequency) antenna are subjected to narrow-band filtering and amplification through a front-end radio-frequency processing module and then sent to an A / D (analog / digital) conversion circuit for analog-digital conversion to obtain medium-frequency digital signals, the medium-frequency digital signals are sent to an FPGA master control processing module for down conversion, filter extraction, zero-frequency adjustment, frequency mixing, decimation filtering and threshold setup, and extracted AIS digital signals are outputted after data coding. The FPGA-based minisatellite-borne AIS signal acquisition system has the advantages of high stability, high radiation resistance, stability in operation and simplicity in circuit design.

Description

technical field [0001] The invention belongs to the field of aerospace applications, and relates to a design of a small satellite carrier functional module. Background technique [0002] With the rapid development of aviation and aerospace technology, especially small satellites, the realization of AIS based on small satellites is of great significance. The spaceborne AIS system can obtain information about ships equipped with AIS equipment on a large scale or even globally in near real time, such as the current position of the ship, voyage, operating status, ship size, draft, and even nationality, ship number, etc. . With the advantages of all-day, all-weather, large-scale, long-distance, multi-parameter, and low-orbit small satellite launch without nationality restrictions, AIS has unique advantages in the field of marine supervision. [0003] At this stage, most of the foreign small satellite-borne AIS systems are realized by using FPGA, and the domestic research starte...

AI Technical Summary

Problems solved by technology

[0006] At present, the common ship-borne, shore-based and airborne AIS is a land-sea base station system working in the VHF band. Due to the limitation of antenna height and other conditions, its maximum operating distance generally does not exceed the range of 50 nautical miles apart, which leads to AIS does not fully reflect its important role and status in large-scale or even global oceans

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