Design And Implementation Of A 2.4GHz Communication Module For Wireless Sensor Network Node

Wireless sensor network(WSN) is a research hotspot in the field of information technology at present. Synthesizing the sensor technology, embedded computation technology, distributed information processing technology and wireless communication technology, WSN is a novel technology in information acquiring, processing and transmitting. It has wide application prospect and great significance in a great deal of fields of military, industry, our daily life, etc..The sensor node is the basic platform for establishing a WSN. It's a micro embedded-system with functions such as signal acquisition, data processing, wireless communication, etc.. It is an ideal solution to utilize communication modules, which are based on single chip wireless transceivers, to transmit data among the nodes of a WSN. Aimed at designing and implementing of communication modules based on single chip wireless transceivers, the following researches are done in the dissertation:1.Based on full investigation of the development of the related field of WSN, we present a design scheme of the communication module of the sensor node upon the 2.4GHz single chip wireless transceiver of nRF24L01 and the 2.4GHz radio frequency power amplifier of UP2206. The scheme includes the framework of the overall hardware design, design of the various functional modules and interconnection among the various functional modules, based on which the PCB is designed, all of the components and the functional modules are soldered on the board and the programs for point-to-point data transmission between two modules are written as well.2.We measure several main parameters of the communication module and present quantitative analysis. The measurement results show that the module can operate well and the transmission distance between the transmitter and the receiver reaches a considerable level, consequently extending the covering range of a WSN to some extent.3.In view of the possible interference caused by the wireless devices working in the 2.4GHz frequency band, we perform an elementary research on anti-jamming performance of the communication module and design a simple frequency agility protocol based on nRF24L01's multi-channel characteristic. The protocol can reduce the module's packet loss rate during data transmission and consequently can improve the reliability of communication in the applications where high data transmission rate isn't seriously required by use of nRF24L01's functions of auto acknowledgement and auto retransmission.