Research On Precision Atmospheric Pressure Sensor

In the field of meteorology, atmospheric pressure sensor has been widely used in the surface meteorological stations and radiosonde. The precision of the atmospheric pressure sensor affect the accuracy of weather forecast directly. It is significantly important for improving the design level of the atmospheric pressure sensor. And then, the accuracy of the atmospheric pressure sensor is guaranteed. Thus, a kind of atmospheric pressure sensor is designed for detecting change in atmospheric pressure. In this paper, the signal-to-noise ratio (SNR) of the atmospheric pressure signal is improved by correlation analysis, wavelet transform and ARM system. The measurement of atmospheric pressure is finally realized.Based on the research progress of foreign and domestic atmospheric pressure detection,the general program of atmospheric pressure detection system is designed. The hardware part of atmospheric pressure signal detection system consists of two parts: the atmospheric pressure signal acquisition subsystem, the signal processing and communication subsystem.The atmospheric pressure signal acquisition system adopts Meas1451 as Pressure-Voltage conversion component. Then, based on the principle of self-correlation detection,the self-correlation hardware detection circuit is accomplished. In signal processing and communication system, STM32F107 Microcontroller is selected as the signal processing unit. By the serial port, the signal of the atmospheric pressure acquisition system is sent to the host computer. In the host computer,wavelet filter and FFT transform is used to extract and denoise the signal.Finally, a detection system of the atmospheric pressure sensor is established. The experiment of atmospheric pressure detection is accomplished. According to the experiment the correctness of the project is verified.