Research On Fish-finder Data Preprocessing And Display Technology

With the development of the national economy, the demands for Marine resources grow and the development of the fishery resources attracts more and more attention. Fish-finder as a Sonar equipment which helps fishing,is used for fish resource assessment, detecting and locating the fish underwater. There are various errors and environmental disturbances in the collection process of the fish finder depth data, which will affect the quality of the depth data,and so it has great practical significance to choose reasonable means to eliminate all kinds of errors in order to get the accurate measurement results. Display interface provides communications environment for the fishermen communicating with the equipment, which is a very important part of the fish finder. The quality of the display interface design directly determines the performance of the fish finder,and the display system with a high real time capability and a friendly user interface can better play the advantages of the fish finder and more accurate oceanographic information can be displayed in front of the users.The data preprocessing technology is very important for the fish-finder water depth processing and ensures the accuracy of the data display. Fish-finder display software is a key part of the fish-finder. In addition to the data recording and processing, it also includes a large sum of complex display procedures. With the development of the equipment which helps fishing and navigation, there realizes many useful functions gradually,such as the effective fishing, the depth sounding early warning, the ENC locating, the autonomous navigation, the fisheries information and the environment information.This paper researches the data preprocessing technology of the fish-finder water depth and the realization of the data visualization; based on the development environment of the embedded Linux, this paper implements the design and development for the surface of the fish-finder display software, completes the data acquisition, data storage, data display, data processing, and other functions with the development background of the electric navigation chart, and verifies the functions of the software system with the use of the ultrasonic transceiver module.The content includes the following aspects:Firstly, according to the performance requirements of the fish-finder display system, this paper regards the embedded Linux system in the display system as one of the fish finder display system of key technologies,chooses the MagicARM270 experiment development platform, builds the software development environment of the embedded Linux,and uses Qt which is the graphical interface development tool of C++ and can cross platforms as the development tools of the system's interface.Secondly, the data preprocessing method is proposed, including eliminating outliers, data interpolation and extrapolation and data smoothing, which can reduce the human and random errors to the display results. At the same time,a key technical problem is put forward applied for the deep surface plane contour map and figure generation process.Then, with the function analysis of the fish-finder display software, this paper proposes the overall structure of the system software design, and completes the main functions' design of the system software, including communication module, data storage module, display module and the verification of the software system with the use of the ultrasonic transceiver module. The designed display software can provide intuitive, easy and fast operations for users, reflect understandable,simple, and practical basic principles,and express the people-oriented design concept.Finally, on the basis of the software design for the fish-finder display system, this paper completes the implementation of the system human-computer interaction interface, mainly including the fish information display interface, the historical data display interface,the electric navigation chart service interface and the ships environmental information interface.The realization of the system function module mainly includes: The design of the RS-232 serial communication interface and the ultrasonic transceiver module, and the accomplishment of the data collection and transmission; The design of the data storage structure and the realization of the measured data file storage can storage the data read from the serial port, which is useful for the inquiries and repetitions of the data; With the program design of the development environment, the achievement of the real-time dynamic data display and the historical data query functions; The testing for the fish-finder display system developed, which proves the design well.The data preprocessing technology of the fish-finder water depth proposed in this paper is verified by the ultrasonic detecting data with good results,and can provide a reference for the depth of data preprocessing. And this proposed effective method has much room for improvement. The fish-finder display software in this paper based on the electric navigation chart completes the scheduled functional requirements, meets the design principles of the human-computer interaction interface on the interface design, gets the data storage, real-time display and historical data query together, which has a good practicability, and introduces the popular embedded concept to the research and development of the fish finder. And viewed from both the functional confirmation and display interface point, the fish finder display software basically meets the functional requirements and the design of human-computer interaction and has a good market value.