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Effective Design and Implementation of Satellite Automatic Identification System (AIS) Receiver

Naderi Darbaghshahi, Navid | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57586 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Shabany, Mahdi
  7. Abstract:
  8. The Automatic Identification System (AIS) is designed to enhance maritime security and can be installed on ships, ground stations, and satellites. This system is used to transmit essential information from ships across four communication bands (two terrestrial bands and two satellite bands). The primary goal of this research is to receive all four communication bands through a satellite in a Low Earth Orbit (LEO). This goal faces two major challenges: the Doppler effect caused by the relative speed of the satellite to the ships and the significant distance of the satellite, which results in temporal signal interference due to the reception of a large volume of signals from ships. To address these challenges, we first explored message detection algorithms capable of receiving messages despite the frequency shifts caused by Doppler. To tackle the second challenge, a two-layer reception approach with a message compensator was employed. Each frequency band has a dedicated receiver block, and after receiving information from each band, the messages are extracted from the main signal with high accuracy and minimal error. The reconstructed signal thus has the least possible time and frequency error relative to the transmitter. Subsequently, the main message is extracted, and the second-layer receiver retrieves the information. In total, eight receiver blocks are required. Given that the AIS system uses GMSK modulation, which is nonlinear, we opted for non-coherent receivers for optimal implementation. To achieve high processing power and limited power consumption in the satellite environment, this implementation was carried out on the Zynq-7000 series FPGA. The results of this research demonstrate that using this method, the messages transmitted by ships along the satellite's orbit can be accurately received and analyzed
  9. Keywords:
  10. Non-Coherent Gaussian Minimum Shift Keying (GMSK)Receiver ; Temporal Signal Interference Reception ; Satellite Automatic Identification System (AIS)Receiver ; Satellite Non-Coherent Receiver ; Communication Block Efficient Implementation ; Automatic Identification ; Low Earth Orbit (LEO)Satellite ; Digital Implementation on Field Programmable Gate Array (FPGA)

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