| The research content of this subject comes from the research and application of continuous remote mobile video monitoring system based on wireless positioning technology,which was funded by Luzhou science and technology bureau in 2016.The author took part in this project and was mainly responsible for the research and design of ZigBee network transmission.ZigBee technology is a wireless network technology suitable for short-distance,low complexity,low power consumption and low speed applications.ZigBee technology has the advantages of multi-hop relay,good network expansibility,easy deployment,self-organization and self-repair.In ZigBee wireless sensor network application,voice is a common monitoring sensor data.Voice signal needs transmission after its collection and processing,so based on IEEE802.15.4 / ZigBee application environment.In this thesis,ZigBee network technology is therefore proposed to collect and transmit voice and positioning information in video monitoring.As a wireless communication technology,ZigBee's technical benefits mainly include low power consumption,low cost,good reliability,large capacity,small delay,high security,small effective range and strong compatibility.At present,most of the video monitoring signals are transmitted by wire,which is hard to install and high-cost.Therefore,the application of short-range wireless communication technology for video transmission will be a tendency in the future.In this project,the Zigbee hardware module with CC2430 chip is selected to form a wireless sensor network in a general indoor and open environment,which is utilized to transmit data at a distance of about 20 m.The auxiliary data transmission scheme in the video monitoring system coincide with IEEE802.15.4 standard is designed,and the hardware platform is also designed and tested to realize the short distance auxiliary data transmission such as voice and positioning of the video monitoring system.The video monitoring auxiliary data transmission scheme takes benefits of the integrated features of CC2430.ADC and APR9600 built-in in the chip complete the sampling,conversion,storage and playback of voice data.It's no need to add voice codec parts,and the use of peripheral devices is minimized to reduce the cost and power consumption.The system can meet the wireless transmission of short distance real-time voice data well.The transmission power can be less than 0dBm.Delay of voice data transmission is less than 25 ms,and the transmission distance can reach 15 m in general.The received voice quality is tested according to the MOS test standard,and the test score is more than 3.This scheme has simple hardware design,low cost and low power consumption.It can be applicable to indoor kindergartens,nursing homes,fire alarming,mine production,wireless sensor networks,and safety monitoring fields.Finally,ZigBee wireless sensor network is utilized to design and develop a set of intelligent data transmission system suitable for indoor monitoring equipment control and daily life management.In this thesis,the related transmission is studied and designed,and the application management system is developed and tested. |
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