AIS Baseband Transceiver Design Of CSTDMA Standard

In recent years, with the intelligent development of shipping equipment, in order to improve maritime safety and prevent the collision. more and more mobile berth AIS equipment achieve the communication between the slipways, the name of AIS is Automatic identification System, which is divided into two standard Class A and Class B. AIS class A is made use of SOTDMA (Self-Organized Time Division Multiple Address) standard sending data, while the B type of equipment incude two formats of communication, the SOTDMA and the CSTDMA.In this paper refer to CSTDMA stsandard. analysising the functional requirements of baseband transceiver based on AIS CSTDMA standard, using high-frequency electronic technology to complete the design of the baseband modulation and demodulation circuit, using embedded systems and multi-mission to design software, and testing the functional of AIS equipment, the result of test show that the system design had completed.The main innovation of this article:(1) Using baseband modem chip CMX7042combine with embedded to complete the data modulation and demodulation;(2) Proposing and completing the circuit design of RF power detector,achieve to detect the power value of emission and the reflecte, not only to provide a basis for automatic adjustment of the transmit power and channel switch, but also to monitor the work of the transceiver circuit all the time;(3) Using PWM correction techniques to improve the traditional slot, making use of the GPS UTC time synchronize AIS slot correctly, which make slot synchronization to be more stable, reliable;(4) The use of mathematical induction and software testing to handle the channel switching technology, which can improve the efficiency of the system;...