Analog-digital conversion circuit for dynamically tuned gyroscope

Abstract

The invention discloses an analog-digital conversion circuit for a dynamically tuned gyroscope, which comprises a divided circuit, an integrating circuit, a logic control circuit, a switching circuit, a shaping circuit, a constant-current source circuit and an output circuit. The analog-digital conversion circuit has the following advantages: (1) as the resistance-type divided circuit is adopted, an integrator can work in a few milliampere state, and the integral accuracy is improved; (2) the ternary widening logic is utilized for replacing the dual logic, the absolute value of the zero position of a ternary logic convertor is small, and the variation of the zero position is also small; (3) the measuring range of the analog-digital conversion circuit disclosed by the invention meets the great dynamic requirement of -600 degrees / s to 600 degrees / s, the clock signal is increased from 128 KHz to 256 KHz to ensure the resolution ratio of angular velocity measurement, and the degree of linearity in the temperature field of [-40 DEG C, +60 DEG C] is less than 8*10<-4>, so the degree of linearity in the entire temperature field range is ensured, and the accuracy of analog-digital conversion is improved.

Description

technical field [0001] The invention relates to an analog-to-digital conversion circuit, in particular to a large-dynamic, high-precision power-tuning gyroscope analog-to-digital conversion circuit in a strapdown inertial guidance system, which belongs to the technical field of circuit design. Background technique [0002] The strapdown inertial guidance system has three channels of gyroscopes and accelerometers directly installed on the carrier, which can sense information such as the angle, angular velocity and motion acceleration of the carrier on each channel. The above information is sent to the control computer, and after conversion processing, the self-propelled mechanism is automatically operated to control and guide the carrier to reach the destination according to the predetermined rules and routes. The dynamically tuned gyroscope is a two-degree-of-freedom gyroscope that uses a flexible joint to support the rotor and uses the principle of dynamic tuning for tuning...

AI Technical Summary

Problems solved by technology

Although the circuit of binary logic is simple, which is conducive to the improvement of miniaturization and reliability, its fatal weakness is that the zero bit output is large, and it is not easy to control

However, as the measurement range increases to ±600° / s, the resolution will be doubled, which is difficult to meet the requirements of use

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