Design And Implementation Of Point-to-point Low Power Consumption Wireless Device In Nature Reserve

The traditional protection of nature reserves mainly rely on patrolling inspection by forest ranger,along with inefficiency and enormous consumption on manpower and resources.By deploying customized wireless transmission system in traditional nature reserve,current situation can be improved significantly.It can make progress on the transmission flexibility of information(text,image,video,etc.),as well as reduce the frequency of forest rangers’regular maintenance.Individual nature reserves has its unique environments and demands,network erection schemes can be adopted according to local conditions.For nature reserve with matching power supply,cables and central engine,wired video transmission systems can be deployed.For nature reserve with only power supply,Embedded wireless sensor systems can serve as a solution.Further,as for those nature reserve without public network or regular power supply,and yet has the requirement of wireless data transmission system in reserve scenarios,this thesis designs a low power wireless device which serves point-to-point transmission with chain topology,that is,it provides an effective hardware solution.Specifically,it mainly includes the following two aspects:1.Implement hardware circuit.The point-to-point low-power wireless transmission device designed in this thesis is connected to the nature reserve chain-relay transmission network as the RF sub-node,which uses a ARM Cortex-M4 architecture based chip EZR32WG330F256R69 as the core.Also,device is consisted of dual power supply module,clock module,interface module,and RF transceiver module,process at a working frequency band of 434 MHz,transmission peak power of 16d Bm with 55m A current consumption,26m A receiving current consumption,4m A standby current consumption,maximal 500 Kbps air rate,receiving sensitivity of-133d Bm.This device can satisfy the wireless and power indicators with controlled PCB size at 24cm~2,within which thermal performance are also optimized.2.Configure the driver program.On the basis of completing the requirements of chain-relay transmission network,this thesis provides a device driver optimization design combine with the characteristics of high efficiency,low power consumption,and convenient deployment.The driver provides abundant communication interface for data transmission,and realizes a complete radio state machine carrying wireless protocol,combine with a flexible interface for debug and control.the upper computer can directly set the wireless transmission parameters(such as transceiver working frequency,power amplifier gain,air speed,etc.)of the device by sending preset commands,which degrades the complexity of the whole system and ensure the completeness of function.