In order to obtain the acceleration information of the three directions in the projectile coordinate system more conveniently and quickly

a method of converting the output voltage value of the three-axis accelerometer into the quantized output of the acceleration value is proposed. The algorithm of traditional calibration coefficient matrix to convert voltage value into acceleration is simplified and optimized. Field programmable gate array（ FPGA） is used for data calculation

which effectively improves the speed of data conversion

while flexibly adapting to the sampling precision and quantization range of the acceleration value. Finally

simulation is performed by inputting real engineering data and a three-axis turntable is used for experimental verification. The results show that the realization of the digital accelerometer is real and effective.