High-precision measuring system and method for mechanical environment parameter of aircraft

Abstract

The invention discloses a high-precision measuring system and method for the mechanical environment parameter of an aircraft in order to achieve high-precision measuring of the mechanical environment parameter of the aircraft. The method includes the steps that input signals are conditioned first, a Sigma Delta type AD converter is selected to be used for conducting oversampling and noise shaping on the conditioned signals, high-frequency noise can be filtered out by FIR digital filtering, at last, the data output rate requirement is guaranteed through an extracting technology, and high-precision measuring of the mechanical environment parameter of the aircraft is achieved.

Description

technical field [0001] The invention relates to a system and method for high-precision measurement of mechanical environment parameters of an aircraft, and belongs to the technical field of signal acquisition and processing. Background technique [0002] Measurement accuracy is one of the most important indicators pursued by the aircraft measurement system (hereinafter referred to as the measurement system), so how to improve the accuracy under limited conditions is the focus of the measurement system design. There are many signal transmission links in the measurement system, and the final measurement accuracy is affected by many factors, among which the AD converter is a very important link. [0003] During the design process of the measurement system, the continuous signal generated by the sensor must be converted into a digital signal to be transmitted through the current wireless channel. Any conversion from analog to digital will inevitably cause signal distortion. How...

AI Technical Summary

Problems solved by technology

The sampling rate of traditional Nyquist-type AD converters is limited, and it is often difficult to meet the requirements of the sampling theorem for mechanical environmental parameters with high signal frequencies, and the signals appear to be aliased. Therefore, the mechanical parameter acquisition part of the existing measurement system is usually before the AD converter. Add anti-aliasing filter for low-pass filtering

The anti-aliasing filter is an analog low-pass filter, limited by the precision of analog components, its stop-band attenuation is difficult to achieve very high, and the signal will still appear a certain degree of aliasing

[0005] Theoretical analysis and previous measurement data show that the combination of traditional Nyquist type AD and anti-aliasing filter can no longer meet the requirements of aircraft measurement system for high-precision measurement of mechanical environment parameters

Images