High-precision accelerometer temperature compensation method

Abstract

The invention discloses a high-precision accelerometer temperature compensation method, and belongs to the field of inertial measurement. The quartz flexible accelerometer is composed of a gauge outfit assembly and a servo circuit assembly. The change of the ambient temperature enables the physical parameters of various materials in the quartz flexible accelerometer to change, thereby generating an influence on the output of the accelerometer. According to the marble tool single-meter-level two-way variable temperature modeling method, the influence of deformation of a strapdown inertial navigation combination body and a test tool on the precision of an accelerometer in the previous temperature modeling process is eliminated, and the precision that the zero-bias stability 3sigma of the accelerometer is smaller than or equal to 0.05 mg under the full-temperature condition is achieved.

Description

technical field [0001] The invention relates to an accelerometer temperature compensation method for high-precision and small-volume strapdown inertial navigation used for navigation and guidance, which belongs to the field of inertial measurement. Background technique [0002] The quartz flexible accelerometer is one of the core sensitive elements of the strapdown inertial navigation system, and its accuracy directly affects the attitude, speed and positioning accuracy of the navigation system. Factors such as ambient temperature, vibration, magnetic field, and air pressure will all affect the accuracy of the accelerometer, and the impact of ambient temperature is particularly important. Therefore, the influence of ambient temperature needs to be considered when designing the inertial navigation system. At present, domestic measures to improve the influence of temperature on accelerometers are mainly temperature control or temperature compensation. The temperature control...

AI Technical Summary

Problems solved by technology

[0003] To achieve accurate temperature compensation, an accurate temperature error model of the accelerometer must be established. The influence of temperature on the output of the accelerometer components in the inertial navigation system is mainly manifested in two aspects: On the one hand, when the system is working normally, the internal temperature change of the system causes The scale factor and zero bias of the accelerometer itself change, which leads to inaccurate measurement of the accelerometer components; Causes changes in installation errors and affects the measurement accuracy of accelerometer components

For medium and low-precision inertial navigation systems, the effect of temperature compensation on zero offset and scale factor is the best, and the accuracy can also meet the requirements. However, for high-precision inertial navigation systems, if the test equipment produces a deformation of 2 arc seconds , which is equivalent to the accelerometer introducing 1*10 -5 g error, therefore, the deformation of the installation caused by the deformation of the structure body and the test tool cannot be ignored, but it is impossible to quantitatively measure these deformations in practice, which requires the design of a high-precision temperature compensation method. Eliminate errors caused by installation deformation

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