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Antenna state detection circuit for ship automatic identification system terminal

A technology for automatic identification of ships and antenna status, which is applied in the direction of measuring electricity, measuring electrical variables, and measuring devices. It can solve problems such as abnormal antennas and no alarm prompts, and achieve the effect of detecting and realizing abnormal situations

Active Publication Date: 2013-01-23
FUJIAN NORMAL UNIV
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Problems solved by technology

[0003] The purpose of the present invention is to provide an antenna state detection circuit for a ship automatic identification system terminal, which overcomes the problem that the existing ship-borne AIS terminal antenna is abnormal and has no alarm prompt

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  • Antenna state detection circuit for ship automatic identification system terminal

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Embodiment Construction

[0017] The following will be combined with figure 1 , describe the specific structure and embodiment of the present invention in detail.

[0018] figure 1 Among them, U1A and U1B are operational amplifiers, L1 is a coupling inductor, L2 and L3 are inductors, D1 and D2 are diodes, C1~C6 are capacitors, and R1~R6 are resistors.

[0019] Pin 1 of the coupled inductor L1 is connected to the power amplifier and a pin of the capacitor C1; pin 2 of the coupled inductor L1 is connected to the antenna and a pin of the capacitor C2. The cathode of the diode D1 is connected to the other pin of the capacitor C1, one pin of the capacitor C3, and one pin of the inductor L2; the anode of the diode D1 is connected to the pin 4 of the coupling inductor L1 and one pin of the resistor R1. The cathode of the diode D2 is connected to the other pin of the capacitor C2, one pin of the capacitor C4, and one pin of the inductor L3; the anode of the diode D2 is connected to the pin 3 of the coupling ...

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Abstract

The invention relates to an antenna state detection circuit for a ship automatic identification system terminal. The circuit is composed of operational amplifiers U1A and U1B, a coupling inductor L1, inductors L2 and L3, diodes D1 and D2, capacitors C1-C6 and resistors R1-R6. The antenna state detection circuit is mounted between a power amplifier and an antenna in the ship-mounted AIS terminal; the pin 1 of the operational amplifier U1A and the pin 7 of the operational amplifier U1B are connected to the analogue-to-digital conversion (ADC) IO port of a microprocessor in the ship-mounted AIS (Automatic Identification System) terminal. During signal transmission, the ADC is initiated and unusual states of the antenna and the power amplifier are determined according to the results of two paths of ADC (Analog to Digital Converter). If unusual states are found, alarm information is displayed on the liquid crystal display screen of the ship-mounted AIS terminal and a promoting voice is provided to remind the working personnel to take appropriate measures immediately; and therefore, heavy potential safety hazards caused by equipment failures due to the problem of the antenna or the power amplifier are eliminated.

Description

technical field [0001] The invention relates to an antenna state detection circuit, in particular to an antenna state detection circuit used for a ship automatic identification system terminal. Background technique [0002] Automatic Identification System (AIS for short) is a new type of digital navigation aid system, which integrates modern communication technology, network technology, computer technology and electronic information technology, realizes the navigation aid function of the ship's all-weather navigation, overcomes the human Limitations of eye vision. AIS is composed of AIS base station on shore, ship-borne AIS terminal and AIS navigation aids, and wireless broadcasting and communication are carried out through the very high frequency (VHF) segment. When installing the ship-borne AIS terminal, the VHF antenna should be installed on the roof of the ship, and connected to the AIS terminal in the cab through a cable. The cable of the VHF antenna is several meters...

Claims

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Application Information

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IPC IPC(8): G01R31/00G01R31/02
Inventor 苏伟达吴允平蔡声镇肖晨李汪彪郑俊周佳铭
Owner FUJIAN NORMAL UNIV
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