multi-antenna space-based ais receiver

Abstract

The invention discloses a multi-antenna space-based AIC receiver, and the receiver comprises an antenna array, a radio frequency front end, and a digital processing unit. The antenna array comprises a plurality of monopole antennas, and receives an AIS signal of a marine ship. The radio frequency front end comprises a plurality of radio frequency receiving channels, and completes the amplification filtering and frequency conversion of a radio frequency signal. The digital processing unit employs a blind separation and differential demodulation method to complete the separation and demodulation of multi-time-slot collision signals. The receiver is advantageous in that the number of multi-time-slot collision signals is large; the demodulation method is simple; the receiver can effectively monitor a high-ship-density sea area; the receiver exerts no special requirements for the array shape and aperture, and is especially suitable for a small-satellite platform.

Description

Technical field [0001] The invention belongs to the field of satellite communication, and particularly relates to a multi-antenna space-based AIS receiver. Background technique [0002] The Automatic Identification System (AIS) is a maritime traffic control system that has been vigorously promoted by the International Maritime Organization in recent years. It is used to realize the traffic management communication between ships and shores and to avoid ship collision accidents. However, the ground propagation of AIS signals is limited by the line of sight (typical communication distance is about 20 nautical miles), and the ground cannot achieve large-scale and long-distance reception, and the satellite covers a wide area, which can realize long-distance AIS signal reception, and master the large-scale sea area and even the global area. Maritime traffic conditions. [0003] Due to the characteristics of high-speed movement and large-scale observation of satellites, the reception and...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a multi-antenna space-based AIS receiver, which overcomes the shortcomings of high carrier-to-interference ratio requirements and weak ability to solve time slot collisions of a single-antenna space-based AIS receiver, and realizes strong co-frequency in a large airspace Separation and demodulation of multiple AIS signals in the interference environment to meet the rapid growth of maritime transportation and ocean trade for large-area, all-weather, high-probability surveillance needs of maritime traffic

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