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Application Implementation of Magnetic Sensor in Intelligent Transportation System

Author: YuHe
Tutor: WeiSui
School: Anhui University
Course: Signal and Information Processing
Keywords: Intelligent Transportation Systems Magnetic Sensor Parking algorithm Speed ??decision algorithm Interactive platform
CLC: TP399-C6
Type: Master's thesis
Year: 2011
Downloads: 67
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Abstract


This paper is completed on the basis of participation in key scientific and technological project \ITS (Intelligent Transportation System) Intelligent Transportation Systems, the main use of information technology to pedestrians, vehicles, roads close to each other harmonization, harmony and implementation, in order to establish a large area within the full range of the role of the real-time, efficient, easy to operate traffic unified management systems. With the further rapid development of China's economy, China's urbanization, motorization life into a stage of rapid development, but is lagging behind the public transport facilities lead to traffic congestion and frequent accidents, environmental pollution problems worsening, so the establishment of a domestic the necessity and urgency of intelligent transportation systems. Sensing devices in intelligent transportation systems take many forms, such as the use of video, coils, etc., and the various ways there are pros and cons, magnetic sensor through the demonstration, the project team selection as a signal source, the specific choice of GMR giant magnetic sensor. In this paper, the two sub-problems of the ITS Deployment: magnetic sensors parking detection system and the vehicle speed measurement system. Project work, the completion of the two patents: intelligent detection and wireless Magnetic geomagnetic signal vehicle detection traffic information detection system; Shen two software copyright: serial synchronous data acquisition platform and public sensing data samples Library system. This article is mainly to show the research and development of the following aspects: 1. Magnetic sensor signal analysis. Demonstration program using magnetic sensors as a source of information on the basis of a large number of field data collection, especially for parking with the specific task of the tachometer, to make a specific embodiment. Through analysis of the GMR sensor characteristic resistance of the giant magneto, in the actual situation in the use of the GMR sensor of the X, Y, Z three-axis magnetic sensing changes in the signal, the completion of the first sequence and the right of the respective axes of the signal selected in the system application weight. By extracting the signal acquisition circuit the amplification signal contrast at all levels, to determine the algorithm used source of data combining circuit adjustment algorithm for providing a reliable source of data. 2. The parking vehicles determination algorithm. Design testing program, according to the actual situation of the vehicle is detected in the hallway, into the garage, straighten the vehicle came to a complete stop in the library and process signal; and in these cases, whether the vehicle near the garage, the signal distinction. Analysis of the signal waveform and characteristic quantities, set the signal-to-background value, the use of software to collect the initial background, and double-buffering technology background value correction algorithm for feature semaphore handling determine whether parking car information, and upload Parking bit final judgment. This achievement has been used in the Shanghai World Expo, Pudong Airport Parking, Wuxi Civic Center and other public places. 3 vehicles line speed determination algorithm. Design speed program, according to project requirements carriageway laid sensor devices for different distances between the sensor, vehicle speed, the direction of travel of the vehicle, whether the impact of data collection and analysis, the final selection trial algorithm has been tested and added after error compensation, complete vehicle detection algorithm, the the program upload speed information. Velocimetry method to make up for the shortcomings of radar and video susceptible to interference in the enforcement process, the Multiport Serial data acquisition platform which designed to fill the Industrial Multiport Serial synchronous acquisition applications. The purpose of the intelligent transportation traffic information platform, parking velocimetry system needs a good interactive platform software interaction design storage for the record of the signal acquisition, multi-threaded decomposition of the signal, extract the amount of useful features, embedded algorithms, will ultimately determine the performance results of the image information in the user interface to facilitate monitoring and user observation. This system is stable, easy to operate, and is now used in Pudong and Jiaxing, conducive to the development of intelligent transportation.

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