Design Of Wireless Data Acquisition System Based On LoRa

In the process of oil field mining today,it usually involves many people need to understand the data information,which requires the data to be collected and transmitted.However,the oilfields are usually distributed in a swamp desert area.Due to the inconvenience of communication and the scattered distribution of wells,it is difficult and costly to transmit data by laying cables.Therefore,building a wireless data acquisition system is necessary.Wireless Ad Hoc Network is a self-organizing wireless network that does not depend on fixed infrastructures.Its networking is convenient,fast and free from time and space constraints.Based on the above,this thesis developed a wireless data acquisition system based on LoRa technology.Focus on the wireless ad hoc network MAC protocol and routing protocols,and in a mesh topology Ad Hoc network to achieve these two protocols.The main research work of this thesis is as follows:(1)Studied the MAC protocol of Ad Hoc network,and analyzed the challenges of MAC protocol in wireless network.The principle of DCF mode in CSMA/CA protocol is analyzed,and the detailed process of DCF mode and the related backoff algorithm are expounded.(2)A more in-depth study of Ad Hoc network routing protocol.The characteristics of two typical on-demand Ad Hoc routing protocols,which are DSR protocol and AODV protocol,are analyzed.For a mesh topology Ad Hoc network,the traditional DSR protocol has been properly improved,an improved routing protocol X-DSR is proposed,and the effectiveness of the improved scheme is verified in a mesh-like wireless ad hoc network.(3)Design and implement a data acquisition system based on wireless self-organizing network.Using RF chip SX1278 based on LoRa technology,we design the RF module of the terminal and the master node,and implement the 802.11 DCF access protocol in the RF module and the X-DSR protocol in the network layer.(4)The RF module bit error rate,communication distance and power performance were tested,the RF module performance parameters.The collector and concentrator together form a small mesh Ad Hoc network,the network delay,communication time and bit error rate were tested to get Ad Hoc network performance parameters.The feasibility of data acquisition through Ad Hoc network is verified through experiments.