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按照宇宙开发计划,航空宇宙技术研究所对陀螺及加速度计进行了研究。随着数字技术的发展,在高精度航空仪表中多希望采用数字处理型式。因此要求惯性传感器(陀螺、加速度计等)的输出是数字量。如果传感器的输出采用模拟量,就必须有模拟—数字转换装置,会给仪表增加重量和降低速度与精度。所以迫切需要一种可以直接输出数字信号的加速度计。它可以按一定时间间隔检测摆的位置,按照正负方向,以负正脉冲力矩反馈到摆上,控制摆总在零位左右。在单位时间内,反馈脉冲或者其正负脉冲之差与输入加速度成比例.如果每个输出脉冲为速度增量△V,对此进行积分便可得出速度。即将随时间连续变化的速度波形,按一定时间间隔,用仅有+△V或-△V振幅变化的阶梯波形近似,这在通讯领域中称为△调制方式。
In accordance with the space development plan, the Institute of Aeronautics and Astronautics studied gyros and accelerometers. With the development of digital technology, the digital processing type is expected to be more and more popular among high-precision aviation instruments. Therefore, the output of inertial sensors (gyroscopes, accelerometers, etc.) is required to be digital. If the output of the sensor is analog, an analog-to-digital converter must be provided that adds weight and reduces speed and accuracy to the meter. Therefore, there is an urgent need for an accelerometer that can directly output digital signals. It can detect the position of the pendulum at a certain time interval. According to the positive and negative directions, it is fed back to the pendulum with a negative positive pulse moment, and the pendulum control is always at or near zero. The difference between the feedback pulse and its positive and negative pulses is proportional to the input acceleration per unit of time, and if each output pulse is a speed increment of ΔV, integrating this gives the velocity. The velocity waveforms to be continuously changed over time are approximated by staircase waveforms with amplitude variations of + ΔV or - ΔV at regular time intervals, which is called delta modulation in the communications field.