| Wireless sensor networks are a self-organizing network through wireless communication technology which is constituted by a large number of sensor nodes. Wireless sensor networks have been widely studied and used in military and national defense,urban management, environmental monitoring. Build a wireless sensor network test platform, test network communications capabilities, and give the evaluation of network performance, are of great significance for the guidance of network design and improvement of the network operation performance situation.First of all, wireless sensor networks are introduced. Program of building a wireless sensor network test platform based Zigbee and ARM embedded systems is Proposed. And then the design of network performance evaluation and GPS relative positioning algorithm is determined。Secondly, the build of the hardware platform is described in detail, including the STM32 microprocessor, CC2530 wireless transceiver module and GPS module. The performance parameters of each module and hardware are described, and the interfaces between modules are elaborated. The implementation of the system functions is introduced.μC-OSⅡreal-time operating system is used to achieve a multi-task scheduling. The design and implementation of software for network monitoring test system, which is running on the PC, is also introduced.Finally, using the system established in this paper tested localization accuracy, network throughput, packet loss rate, time delay and jitter of a wireless sensor net work and given an accurate assessment of network function. |
