Research On Sonobuoy Positioning Based On Localization Technology Of Wireless Sensor Network

Sonobuoy is mainly used for the detection of underwater target objects of float type sonar underwater acoustic remote sensing detector. The traditional sonobuoy positioning system is mainly composed of buoy on the equipment on the plane multi-channel ultrashort wave buoy signal receiving device, buoy signal processing and display devices and sonobuoy detector, etc. It is commonly used in aviation anti-submarine detection and location system for underwater submarine targets such as monitoring and warning, etc. The position of buoy nodes in the traditional sonobuoy positioning system is usually obtained by GPS, and location accuracy is lower for 20 to 30 m. The traditional sonobuoy positioning is mainly based on single sonobuoy nodes, and target localization accuracy is low in water. Based on these, this paper puts forward a sonar buoy nodes of wireless sensor network by a large number of sonobuoy nodes by wireless communication mode. In the network nodes use sleep-wake up-sleep works, and collect data at a certain period. By means of localization technology of Wireless Sensor Network, Multi-sensor Data Fusion. Information Processing and Embedded Technology, it can realize accurate positioning for sonobuoy node. At the same time it can also realize accurate positioning for targets in water by various sonobuoy node location information. In real ocean environment, current positions of sonobuoy nodes may be changed as the ocean currents. This paper choses a kind of localization technology that it is used in the mobile node localization based on RSSI (received signal strength) ranging algorithm and maximum likelihood estimate measurement method of, and it can realize accurate positioning for sonobuoy node. This paper introduces in detail the algorithm principle and implementation process, and simulation results show that the algorithm in the mobile node localization is effective and high positioning accuracy. After the sonobuoy node is located, by means of various sonobuoy node location information and ultrasonic sphere intersection method, it can realize accurate positioning for targets in water.In order to solve the problem that sonobuoy node position changing which due to the effect of ocean currents is even unable to communicate between nodes, this paper uses sonobuoy nodes locked each other. Each node is connected to each other through the fixed rope. And Considering sonobuoy monitoring node work in much electromagnetic interference, and it is not easy to replace the battery. In addition. the distance between nodes increases as the nodes move and it leads to not communicate between nodes. This paper designes a rectangular microstrip antenna. The antenna is based on CC2430 2.4GHz. with strong anti-interference ability, low energy consumption and long communication distance, etc. Finally, the antenna simulation result shows that communication distance can be up to 80 m, and it meets basically the requirements of the scope of communication between nodes in actual environment. Due to the sonobuoy monitoring nodes using 2.4 GHz ISM band, this paper chooses ZigBee communication protocol between nodes, and it is a kind of low power consumption, low rate and short distance wireless communication protocol. To ensure the normal communication between the sonobuoy gathering node and each node in network, the wireless communication part of sonobuoy gathering node selects CC2430 and front-end rf CC2591. and communication distance can reach above 1000 m. Besides sonobuoy gathering node uses 3G to communicate with the base station. meeting the requirement of the data transmission speed and large amount of information.This paper details analysis of Wireless Sensor Network localization algorithm implementation process and the various algorithms for the simulation analysis of its advantages and disadvantage. For the characteristic of sonobuoy node localization. This paper chooses a kind of positioning methodsrange that it base on RSSI algorithm and maximum likelihood estimate measurement. Using Matlab7.0 on the positioning algorithm simulation, the experimental simulation result shows the node positioning error is about 2.64 m. Relative to the node communication range 20 m, the relative error is about 10% to 15%. and it meets basically the application requirement of actual working environment, and it is higher positioning accuracy. Finally, in view of the sonobuoy nodes positioning for target in water, this paper puts forward to ultrasonic sphere intersection positioning method, introducing positioning principle and process and designing specific positioning implementation circuit in detail.