An Anti-Jamming Navigation Warning Receiver System

Abstract

The invention discloses an anti-interference NAVTEX receiver system. The anti-interference NAVTEX receiver system comprises an orthogonal antenna sub-system and an information terminal sub-system; theorthogonal antenna sub-system is connected to the information terminal sub-system; the orthogonal antenna sub-system comprises an orthogonal directional magnetic field antenna unit, four digital-to-analogue conversion units, a digital intermediate-frequency processing unit and a serial port sending unit; and the information terminal sub-system comprises a serial port receiving unit, a baseband signal processing judgement unit and a display control unit, wherein the orthogonal antenna sub-system and the information terminal sub-system are connected through a serial port differential twisted pair. According to the anti-interference NAVTEX receiver system disclosed by the invention, effective signals from a space are simultaneously received by adoption of orthogonal directional antennas, which are vertical to each other; interference receiving can be weakened; therefore, the receiving signal to noise ratio is increased; the receiving sensitivity is improved; the twisted pair is used fortransmitting baseband low-speed digital signals, and has the advantages of being long in transmission distance, free from transmission loss, high in anti-interference capability, low in cost and the like; flexible wiring can be realized; and environmental interference on the receiver system can be avoided to the most extent.

Description

technical field [0001] The invention relates to the technical field of ship communication and navigation, in particular to an anti-interference navigation warning receiver system. Background technique [0002] The navigational warning receiver (NAVTEX) system is a dedicated broadcasting system for broadcasting navigational warnings, weather warnings, weather forecasts and other emergency information for ships navigating at sea. It is an important component of the Global Maritime Distress and Safety System (GMDSS). Security plays a very important role. The special frequency used by the NAVTEX system is 518KHZ. It uses the FEC method of narrowband direct printing (NBDP) to broadcast standard and English information to ships sailing along the coast. In addition to standard English, various countries are allowed to use other frequencies to broadcast their own languages, such as China. Broadcast Chinese information at 486KHZ or 4209.5MHZ. [0003] The defects of the existing na...

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Problems solved by technology

[0008] The technical problem to be solved by the present invention is that the sensitivity of the existing navigation warning receiver system is low, which affects the safety of navigation, and the traditional omnidirectional antenna has poor anti-interference ability, which affects the received signal.

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