Design Of Ultrasonic Wind Velocity Measurement System Based On ARM

Wind velocity is an important factor in meteorological area. There are many advantages when ultrasonic is used to measure wind velocity. The ultrasonic velocity, affected by the wind, is different when it transmits in the direction of forward flow or in the direction of opposite flow. An ultrasonic anemometer based on the theory was developed, and it had the superiorities of high precision, high dependability and high integration. It has been widely used because of its proficient technique. The key parameter of the anemometer is precision.ARM is a 32 bit microprocessor with abundant on-chip resources, and its handling capacity is up to 60M with low power consumption. It is suitable to make up an intelligent instrumentation. In the thesis, correlative researches of key technology were done, and ultrasonic wind velocity measurement system based on LPC2132 with ARM7TDMI-S core is designed. It can measure wind velocity, display, modulate precision and communicate with PC by serial interface. The system hardware includes ARM7 microprocessor, peripheral analog and digital circuits. Modular design was adopted, and because of it, the complexity of complicacy system hardware design was predigested, and the system stabilization and reliability were enhanced. System software controls the transmission and receiving of ultrasonic signal and recognizes the arrival time.This thesis is divided into six chapters. The first chapter is a prolegomenon, mainly introduced the development and status of the ultrasonic wind meter, target and meaning of the thesis, my work and primary innovation, etc. The second chapter describes the theory of ultrasonic wind velocity measurement. The third chapter introduces the hardware design of the measurement system. The fourth chapter introduces the software design. The fifth chapter gives the system error analysis. The sixth chapter sums up the thesis and expects the next work.