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Electronic Scale Anti Cheat Key Technology Research and System Design

Author: ZhangHongLei
Tutor: LiChunGui
School: Guangxi University of Technology
Course: Control Theory and Control Engineering
Keywords: Electronic truck scale anti- cheating SCM Signal encoding Signal decoding Antenna directivity
CLC: TH715.1
Type: Master's thesis
Year: 2011
Downloads: 25
Quote: 0
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Abstract


Electronic truck scale weighing equipment is indispensable in modern large quantities of supplies transaction process, simple operation, accurate weighing results to modern production, transportation has brought great convenience. Economic growth in advances in technology have made electronic truck scale manufacturing has improved by leaps and bounds. Frequent weighing transactions driven by the interests of the lawless elements using high-tech means to develop a new wireless remote control cheating device, the hidden and real-time, simple operation, short time cheating cheating device characteristics. This article is mainly for such wireless remote control cheating device, design a dual-band point directional interference anti-cheating system. First analysis of the cheating device cheating principle, to arrive at the composition and working principle of the anti-cheat system module. The use of tamper-resistant, high-frequency radio signals directional receiving system detects space whether the presence of high-frequency cheating signal. Characteristics of the signal according to the analysis of high-frequency cheating, cheating to the high-frequency signal intercepted demodulation and decoding, and analysis of the high-frequency the cheating signal carried by the cheating information obtained information is sent in the high-frequency the cheating signal in the format in accordance with the cheating signal characteristics of data formats to generate anti-cheating in high-frequency transmitter signal format and the anti-cheat data, microprocessor control, automatically or manually for targeted interference. The antenna theory rational design of the system antenna, transmitter interference signal has regioselectivity, tamper-resistant, high-frequency signal transmission to further improve the relevance and reduce transmitter power. The system is directed by the microcontroller to control the core, including receiving and decoding part of the high-frequency radio signals, encoding and transmitting part of the high-frequency radio signals, time-division multiplexed dual-band jamming system. Wireless RF transmitter and receiver belong to the analog circuit portion, the microcontroller and its peripheral devices belonging to the digital circuit section, so the present system is a combination of digital and analog high-frequency circuit system, we must analyze the system interference and take the appropriate anti-interference measures . The system internal interference primarily from mutual interference, the mutual interference of the signal receiver and transmitter of the digital part and the analog part as well as from the power supply the printed boards comp traces mutual interference. External interference Usually by radiation or IO port input.

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CLC: > Industrial Technology > Machinery and Instrument Industry > Instruments, meters > Measuring instruments > Quality measuring instruments > Weight measuring instruments
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