The Application Design Of Ship Navigation Based On The Positioning And Communication Module Of The Beidou

As land resource has dried up, people will look to the vast ocean, it provides basic water, fish, salt to human. Besides rich undersea oil, coal and natural gas and other one-time energy, there is more iron ore, barite ore, manganese nodule, potash and other submarine treasure. Our country also has a vast sea, so navigation and communication is an indispensable part of offshore. Usually offshore still has GPRS signal, but once the ship is far away from the land, it also basically lost contact with the outside world.then contact method usually is through satellite communication. The ocean’s sitiuation is more extreme, unpredictable, and land monitoring platform needs the real-time understanding of ships in the case of the above, including conventional ships position, the daily report and non notification emergency event routine. At the same time, the vessel should also learned that the current geographic location, their real-time speed, and keep in touch with the land, when faced with an emergency can timely reflect, such as tsunamis, hurricanes and other natural disasters, the vessel damage, interpersonal conflicts, and unknown foreign enemy inbreak and other unexpected events. Mistakenly sailed to other country without permission field all need timely contact with the main monitoring, to seek help.Therefore, this thesis presents a design scheme for the Beidou satellite navigation system developed independently by our country. Beidou I and II for positioning, navigation and communication module, can be displayed on the touch LCD screen in real time. When the ship is sailing on the sea, every other period of time, it can receive the Beidou Positioning Data, and then the main control module through the short message of Beidou I sent positioning data to land, at the same time the location data display on the LCD. In addition, when the ship encountered anomalies, the system start the emergency alarm processing mode, transmitting alarm information, opening the alarm lamp and high alarm horn, showing events on the LCD. The SD card preserve the navigation recorded during routine localization, time data and other including temperature, humidity and so on. The system itself also has a leakage detection, low voltage detection and obstacle distance detection. Land communicate with the ship through the short message of Beidou I.This thesis mainly completed the following several parts:Beidou I module design, the low noise amplifier of Beidou I design, navigation and application design of periphery hardware circuit design, real-time operating system software platform and application software design and system debugging.Design of Beidou I module includes the BM3005 baseband chip, RX1003C2 as RF chip, BN161P as the power amplifier chip to together complete the Beidou I of baseband signal modulation and demodulation process and using ATF54143 and SGL0622Z as the core amplifiers, through the two stage cascade way to complete the low noise amplifier meeting with high gain and low noise design requirements.Peripheral hardware of ship navigation regards the STM32 as the main controller, including the serial circuit design, power management module, SD card storage circuit design, LCD touch screen interface, Beidou Ⅰ interface circuit, Beidou Ⅱ positioning module design, the water leakage monitoring circuit interface, indicator light and a high pitched alarm circuit.Real-time operating system based on uCOS-Ⅱ real-time operating system monitoring platform system, which manage each application interaction event. The real-time operating system monitors system status, position, and immediately gives feedback to the land monitoring center and acceptance monitoring center command.First design Beidou Ⅰ module, low noise amplifier of Beidou Ⅰ, ship navigation. finally in the laboratory debug each module and the whole that is combined with software and hardware together, demonstrate the ship navigation application design meeting the requirement of the expected design.At the end of this thesis, review and summarize the work have be done in this topic, also point out deficiencies that still exist at present and later still should be improved and perfected.