Altitude and Speed Sensor with Digital Compensation Technique

Pressure measuring is the foundation of sensing and measuring technology of altitude and velocity. This subject is the study on sensing and measuring technology to silicon pizeo-resistance pressure for altitude and velocity measuring. For the error compensation of piezo-resistance sensor, digital compensation substitution of analog compensation is put forward in this research, by which to make the sensor output to be a linear, non-drift and rebuilt analog signal. After compensation its zero temperature drift and sensibility temperature drift are all better than 1 times 10^-4FS/degC, and non-linear error is better than plusmn 0.2%. A high performance altitude/velocity transducer was self-developed for on-board flight test by this study, which could be used in the flight testing.