Road traffic information acquisition sensor network node device and data transmission method thereof

Abstract

The invention provides a network node device for a traffic information acquisition sensor, comprising a digital signal processor DSP, a network communication controller, a CAN communication controller and / or a signal conditioning circuit and / or a serial communication circuit, wherein, the network communication controller is used for large capacity data communication between the DSP and the communication network; the CAN communication controller is used for digital communication of high real time with a CAN interface; the signal conditioning circuit is used for exchanging input signals of an analogue quantity sensor, a switching value sensor and an impulse sequence sensor so as to satisfy the requirements of the DSP on the input signals; the serial communication circuit is used for short distance data communication and for maintaining and conditioning the node device. The device can be connected with various sensors, ensures that the prior traffic information acquisition sensors form a network, has the functions of a fieldbus and the Ethernet data communication, changes the deployment and the operation way of the prior traffic information collecting sensors and can obtain integrated traffic information.

Description

technical field [0001] The invention relates to the application of network technology, in particular to a sensor network node device for collecting road traffic state information and a data transmission method thereof. Background technique [0002] The physical basis of road traffic information collection is physical sensors. At present, in the road traffic system, there are many types of sensors used, such as loop coil sensors, video image sensors, microwave sensors, infrared sensors, ultrasonic sensors and so on. [0003] The use of sensors is also an important factor in accurately obtaining road traffic conditions. The use of existing sensors is characterized by: [0004] ● Multiple sensors serve one application and one sensor serves multiple applications. For example, coil sensors, microwave sensors, ultrasonic sensors, etc. are used in traffic management; at the same time, the data of coil sensors is not only used for traffic control, but also for applications such a...

AI Technical Summary

Problems solved by technology

[0009] ●The mass data generated by the existing sensor deployment method has extremely high requirements on the processing capacity of the background system and leads to the increasing complexity of integration for global comprehensive applications;

[0010] ●Existing sensors lack online processing capabilities, and traffic status information required by various applications of intelligent transportation systems cannot be obtained online, in real time, and accurately

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