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Conflicting signal processing method applicable to satellite-borne AIS (automatic identification system)

A signal and single-channel signal technology, applied in the field of aerospace and marine communications, can solve the problems of AIS signal collision, large detection signal area, errors, etc., and achieve the effect of flexible configuration and expansion of detection area

Inactive Publication Date: 2014-08-06
SHANGHAI SPACEFLIGHT ELECTRONICS & COMM EQUIP RES INST
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  • Application Information

AI Technical Summary

Problems solved by technology

The collision mechanism of AIS signals is divided into two categories: one is that because the receiving area contains multiple ad hoc areas, ships in different organizational areas may send AIS information in the same time slot and arrive at the spaceborne receiver at the same time , resulting in AIS signal collisions; the other type is due to the large area where the spaceborne receiver can detect signals. Although the ships in the monitoring area send AIS information in different time slots, when the distance between the ships is far enough, due to The influence of signal transmission delay can also produce the phenomenon that AIS signals arrive at the same time
When encountering the AIS signal collision phenomenon caused by the above two situations, using the traditional method to receive AIS information will cause errors

Method used

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  • Conflicting signal processing method applicable to satellite-borne AIS (automatic identification system)
  • Conflicting signal processing method applicable to satellite-borne AIS (automatic identification system)
  • Conflicting signal processing method applicable to satellite-borne AIS (automatic identification system)

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Embodiment

[0031] like figure 1 As shown, the known information in the frame structure includes: a training sequence serving as a frame synchronization header, a frame start flag, a data segment, a check sequence, a frame end flag, and a final buffer sequence.

[0032] AIS uses a bit-oriented protocol based on the High-Level Data Link Control (HDLC) specified in ISO / IEC 3309:1993.

[0033] The training sequence consists of alternating 0s and 1s (010101...) for a total of 24 bits.

[0034] The length of the frame start marker and the frame end marker are both 8 bits, which are composed of standard HDLC markers, and their functions are to identify the beginning and end of a frame.

[0035] The length of the data segment in a standard data packet shall be 168 bits.

[0036] The Frame Check Sequence (FCS) uses a Cyclic Redundancy Check (CRC) 16-bit polynomial to calculate the check. Only the data portion that includes bit stuffing should be included in the CRC calculation.

[0037] The b...

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Abstract

The invention discloses a method for processing a conflicting signal of a satellite-borne AIS (automatic identification system). The method comprises the following steps: estimating synchronism and signal channel of a received AIS signal according to known information in a frame structure, detecting the received signal, and acquiring a detection result which is a single channel signal; reconfiguring the single channel signal to obtain a reconfiguration signal by utilizing the detection result; subtracting the reconfiguration signal from the received AIS signal to obtain a surplus signal; re-estimating the synchronism and signal channel of the surplus signal, and re-detecting the single channel signal; and repeating the steps for multiple times until no signal is detected. By adopting the method, a multi-channel transmission signal can be effectively detected from the signal-channel received signals.

Description

technical field [0001] The invention belongs to the technical field of aerospace and navigation communications, and in particular relates to a conflict signal separation method that can be used in a spaceborne AIS system. Background technique [0002] When multiple signal sending ends send signals to the same signal receiving end, the signal receiving end receives multiple signals at the same time, and the signal collision phenomenon occurs, and the traditional signal processing method cannot obtain the correct sending signal. [0003] In the field of navigation, the Automatic Identification System (AIS) is an automatic ship automatic identification system jointly promoted by the International Maritime Organization (IMO), the International Association of Navigational Aids (IALA) and the International Telecommunication Union (ITU-R) in 2000. New navigation aids electronic system for identification, communication and navigation functions. The slipway installed with the AIS sy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L7/00H04B7/185
Inventor 方诗峰刘婧张喆李洪星
Owner SHANGHAI SPACEFLIGHT ELECTRONICS & COMM EQUIP RES INST
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