Automatic identification system switch circuit for ship
An automatic identification system and switching circuit technology, applied in the direction of electronic switches, electrical components, pulse technology, etc., can solve the problems of poor reliability and durability, complex structure, etc., and achieve the effect of fast switching speed, small size, and overcoming complex circuits
Inactive Publication Date: 2009-06-24
NANJING UNIV
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Problems solved by technology
One is the high-frequency relay method, the main disadvantage is poor reliability and durability; the other is the duplexer technology, which is mainly used in occasions where the sending and receiving frequencies are different; the other is the PIN tube technology, which uses dual power supplies for control, and usually has a complex structure
Method used
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Embodiment Construction
[0021] The switch is mainly composed of two parts: transmitting and receiving. The circuit mainly uses multiple PIN tubes working at high frequency, and realizes the frequent switching of sending and receiving under the control of MCU.
[0022] 1. Transmitter switch circuit
[0023] figure 1 Among them, D9, D10, D28 are PIN tubes, and D29 is an ordinary diode. When in the transmitting state, TX0 controlled by the MCU is at high level, so D9, D28 are in the on state, and D10 is in the off state. At this time, the radio frequency signal at the Transmit end output by the power amplifier can directly reach the antenna, and has a small insertion loss. When in the receiving state, TX0 controlled by the MCU is at low level, and RX0 is at high level, so D9 and D28 are in the off state, and D10 is in the on state. Under normal circumstances, the power amplifier has no output at this time. In case of a runaway situation, the RF signal at the Transmit end output by the power amplifier...
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Disclosed is a switching circuit for a ship automatic recognition system, which is used for the connection circuit of high frequency wireless receiving circuit and transmitting circuit, and an antenna; the switching circuit comprises switching circuits which connect the receiving circuit with the transmitting circuit; the output ends of the two switching circuits are connected with an antenna to respectively construct a receiving switching circuit between the receiving circuit and the antenna, and a transmitting switching circuit between the transmitting circuit and the antenna; MCU control signal is connected with the control ends of the receiving switching circuit and the transmitting switching circuit; at least two PIN tubes with the same polarity are connected between the transmitting circuit and the antenna in series; the anodes of the PIN tubes are connected with the antenna; the output control end of MCU is connected with the anodes of the PIN tubes, and connected with a PIN tube with opposite polarity and connected with the receiving circuit; at least two PIN tubes with the same polarity are connected between the receiving circuit and the antenna in series, and the anodes of the PIN tubes are connected with the antenna; the output control end of MCU is connected with the anodes of the PIN tubes; the switching circuit for a ship automatic recognition system is applicable to the switching in wide frequency range and high frequency.
Description
technical field [0001] The invention relates to a switch circuit of a marine automatic identification system (AIS), and is especially suitable for frequent switching occasions of sending and receiving radio frequency signals. Background technique [0002] AIS (Automatic Identification System) is a ship navigation system. It is composed of shore-based (base station) facilities and ship-borne equipment. It is a new type of digital navigation aid system and equipment integrating network technology, modern communication technology, computer technology, and electronic information display technology. In recent years, the International Maritime Organization (IMO), the International Association of Aids to Navigation (IALA), and the International Telecommunication Union (ITU) have jointly studied and selected one of the equipment that must be installed on ships. [0003] In the past, VTS was used for ship navigation. It is a high-tech system integrating radar, communication, navigat...
Claims
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IPC IPC(8): H03K17/94
Inventor 纪圣谋刘先昆徐健健
Owner NANJING UNIV