CN201878136U

CN201878136U - CSTDMA-SOTDMA (Carrier Sense Time Division Multiple Access-Self Organizing Time Division Multiple Access) double mode type AIS (Automatic Identification System) transceiver circuit

Info

Publication number: CN201878136U
Application number: CN2010202656281U
Authority: CN
Inventors: 秦嗣波; 张财元; 王涛; 刘冰炎; 李辉辉; 张键; 孟新平
Original assignee: Tianjin 712 Communication and Broadcasting Co Ltd
Current assignee: Tianjin 712 Communication and Broadcasting Co Ltd
Priority date: 2010-07-21
Filing date: 2010-07-21
Publication date: 2011-06-22
Anticipated expiration: 2020-07-21

Abstract

The utility model relates to a CSTDMA-SOTDMA (Carrier Sense Time Division Multiple Access-Self Organizing Time Division Multiple Access) double mode type AIS (Automatic Identification System) transceiver circuit, which comprises a base band control module, an external interface module, a GPS (Global Position System) module, an AIS radio frequency transmission module and a power supply module, wherein the use mode of equipment is automatically switched according to an internal built-in running condition judgment or an external instruction, so that the equipment has the advantages of both the CSTDMA mode and the SOTDMA mode. The CSTDMA mode is used in the sea area with crowd boats, therefore, the interference to a communication channel can be effectively reduced, and the AIS function of a big boat is not affected. In the sea area controlled by an old base station, the mode is switched to the SOTDMA mode through the instruction. Single equipment has the characteristics of two modes, so that the compatibility problem is efficiently solved. The old base station also can be used for monitoring and managing the novel equipment. The CSTDMA-SOTDMA double mode type AIS transceiver circuit has the advantages of novelty, practicability and popularization value.

Description

CSTDMA-SOTDMA double-standard AIS transceiver circuitry

Technical field

The utility model relates to automatic identification system (AIS) field, relates in particular to a kind of CSTDMA-SOTDMA double-standard AIS transceiver circuitry that is fit to be applied to the CLASS_B type that small-sized non-SOLAS pact ship uses.

Background technology

In present marine vessel security fields, AIS is an of paramount importance ring.The AIS equipment of existing market adopts a kind of among single access way: CSTDMA or the SOTDMA basically, both in use have their own characteristics each, SOTDMA inserts accuracy and have greater advantage aspect AIS application program compatible at time slot, and CSTDMA has fabulous CG channel-guard characteristic, its running is to the minimum that influences of big ship in the channel, at the crowded occasion degree of safety height of ship, extremely be fit to national conditions.

As make AIS equipment can have the advantage that CSTDMA inserts standard and SOTDMA access standard concurrently, use the CSTDMA access way in the crowded marine site of ship, then can effectively reduce interference to channel, do not influence big ship AIS function, in old type tube base stations control marine site, switch to the SOTDMA mode by instruction, an equipment can have the characteristics of two kinds of standards simultaneously, can effectively solve compatibility issue, and at present domesticly still not have this kind equipment and be applied to this technical field.

Summary of the invention

In view of above problem, the purpose of this utility model just provides a kind of design, CSTDMA is inserted standard and SOTDMA to be inserted standard and applies in the same AIS equipment, can make same AIS equipment work in SOTDMA state or CSTDMA state as required, by the judgement of the built-in running environment in inside or according to external command, automatic switching apparatus uses standard.

For achieving the above object, the technical scheme that the utility model adopted is: CSTDMA-SOTDMA double-standard AIS transceiver circuitry, it is characterized in that, circuit is made of base band control module, external interface module, GPS module, AIS radio frequency transmission module and power module, and described base band control module is mainly by main control chip TMS320VC5502, constitute as the RAM and the flash of its related peripheral circuit; Base band control module external interface comprises at least one RS232 interface and a RS485 interface; Base band control module connection external interface module and the host computer communication interface that comprises by the external interface module, AIS graphic display terminal interface are communicated by letter with host computer; The GPS module adopts integration module, and links to each other by serial ports between the base band control module; AIS radio frequency transmission module comprises 2 road TDMA receivers and 1 road TDMA transmitter; The TDMA receiver connects RF antenna and TDMA decoding circuit respectively, and the TDMA decoding circuit connects base band control module input port, and base band control module output port connects the TDMA coding circuit, and the TDMA transmitter does not connect TDMA coding circuit and RF antenna.

The beneficial effects of the utility model are, same AIS equipment can work in SOTDMA standard state or CSTDMA standard state, by the judgement of the built-in running environment in inside or according to external command, automatic switching apparatus uses standard, make equipment can have the advantage that CSTDMA inserts standard and SOTDMA access standard concurrently, use the CSTDMA access way in the crowded marine site of ship, can effectively reduce interference to channel, do not influence big ship AIS function, in old type tube base stations control marine site, switch to the SOTDMA mode by instruction, an equipment can have the characteristics of two kinds of standards simultaneously, can effectively solve compatibility issue, allows old base station also can carry out monitoring management to new model equipment, therefore, the utlity model has novelty, practicality and promotional value.

Description of drawings

Fig. 1, CSTDMA-SOTDMA double-standard AIS transceiver circuitry structure chart;

Embodiment

Understand the utility model for clearer, describe the utility model in conjunction with the accompanying drawings and embodiments in detail:

As shown in Figure 1, equipment has the software and hardware structure that meets IEC-62287, directly supports CSTDMA and SOTDMA to insert standard for two kinds, after the device power-up, default according to equipment, select a certain standard operation, when receiving base station command or meeting specified conditions, switch to another kind of standard.

CSTDMA-SOTDMA double-standard AIS transceiver circuitry, circuit is made of base band control module, external interface module, GPS module, AIS radio frequency transmission module and power module, and the base band control module is mainly by main control chip TMS320VC5502, constitute as the RAM and the flash of its related peripheral circuit; Base band control module external interface comprises at least one RS232 interface and a RS485 interface; Base band control module connection external interface module and the host computer communication interface that comprises by the external interface module, AIS graphic display terminal interface are communicated by letter with host computer; The GPS module adopts integration module, and links to each other by serial ports between the base band control module; AIS radio frequency transmission module comprises 2 road TDMA receivers and 1 road TDMA transmitter; The TDMA receiver connects RF antenna and TDMA decoding circuit respectively, and the TDMA decoding circuit connects base band control module input port, and base band control module output port connects the TDMA coding circuit, and the TDMA transmitter does not connect TDMA coding circuit and RF antenna.

GNSS is that Global Navigation Satellite System (GLONASS (Global Navigation Satellite System)) is a kind of of GPS among Fig. 1, the GPS module is responsible for obtaining current location information, and be transferred to the base band control module, AIS radio frequency transmission module is responsible for changing aerial wireless ais signal into baseband signal, pass to the base band control module and accept the control of base band control module, and to the ais signal of aerial transmission oneself.

Base band control module internal operation AIS protocol stack is responsible for the AIS that receives is handled, and operation external interface and control AIS radio-frequency module outwards send ais signal.

Externally control module is responsible for connecting the communication interface of host computer, AIS graphic display terminal etc.

The GPS module adopts integration module, and links to each other by serial ports between the base band control module; External interface comprises at least one RS232 interface and a RS485 interface.

Base band control module software section is constructed as follows:

This software is with other equipment differences, two protocol stacks that insert standard in equipment, have been realized, other equipment are only realized one of them, in initialization procedure and running the standard of using are adjudicated, and select suitable standard to move the protocol stack of corresponding access way.

The formation of base band control module software section comprises: the control of protocol stack standard, SOTDMA insert the standard protocol stack and CSTDMA inserts the standard protocol stack; Running software AIS protocol stack directly supports CSTDMA and SOTDMA to insert standard for two kinds;

After the device power-up, default according to equipment, select a certain standard operation, when receiving base station command or meet specific redirect condition, switch to another kind of standard;

Base band control module software flow comprises the steps:

Equipment carries out initialization after startup,

Setting according to the device interior storage runs on SOTDMA standard or CSTDMA standard,

In the running, when receiving message, carry out system determination,

Meeting the redirect condition then switches;

System determination redirect condition is: the occupied rate of current channel surpasses 60% and switches to the CSTDMA standard in one minute, is lower than 50% and surpass 3 minutes if the air traffic channel rate takies, and then recovers original default standard.

Initialization procedure, equipment at first read default standard, move the corresponding protocol stack then, are operated under the corresponding standard.

Running: after system moves the protocol stack of corresponding selection, obtain corresponding AIS information and instruction from air traffic channel, submitting to the corresponding mechanism of AIS with the standard irrelevant contents handles, switch the standard instruction if receive, then call and switch to the function of specifying standard, switch AIS and insert standard continuation operation.

In actual hardware of the present utility model was realized, the base band control module was by formations such as the RAM of main control chip (TMS320VC5502) and related peripheral and flash.

According to the above description, can realize scheme of the present utility model in conjunction with art technology.

Claims

1.CSTDMA-SOTDMA double-standard AIS transceiver circuitry, it is characterized in that, circuit is made of base band control module, external interface module, GPS module, AIS radio frequency transmission module and power module, and described base band control module is mainly by main control chip TMS320VC5502, constitute as the RAM and the flash of its related peripheral circuit; Base band control module external interface comprises at least one RS232 interface and a RS485 interface; Base band control module connection external interface module and the host computer communication interface that comprises by the external interface module, AIS graphic display terminal interface are communicated by letter with host computer; The GPS module adopts integration module, and links to each other by serial ports between the base band control module; AIS radio frequency transmission module comprises 2 road TDMA receivers and 1 road TDMA transmitter; The TDMA receiver connects RF antenna and TDMA decoding circuit respectively, and the TDMA decoding circuit connects base band control module input port, and base band control module output port connects the TDMA coding circuit, and the TDMA transmitter does not connect TDMA coding circuit and RF antenna.