Sine and cosine measurement signal correction module and method
A technology of cosine signal and sine signal, which is applied in the direction of sine signal conversion, measuring device, and conversion sensor output, etc., which can solve the problems of difficult real-time signal correction between signal and real signal, increasing the complexity of signal acquisition software and processor burden, etc. Achieve the effect of overcoming real-time amplitude correction, realizing real-time acquisition, and reducing complexity
Active Publication Date: 2017-07-07
HEFEI UNIV OF TECH
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Problems solved by technology
[0003] At present, most literatures and actual measurements use software fitting methods to correct the three types of errors of DC drift, unequal amplitude, and non-orthogonalization in the sine-cosine measurement signal. In theory, it can infinitely approach the real by increasing the sampling rate. The sine wave signal, and use the method of mathematical fitting to obtain and eliminate the three types of errors, but the software correction method increases the complexity of the signal acquisition software and the processor burden, and because the signal acquisition accuracy is limited by A / D conversion Due to factors such as the number of digits and sampling rate, there is still a certain deviation between the signal used for error correction and the real signal, and it is difficult to achieve real-time correction of the signal
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[0038] In this example, if figure 1 As shown, the sine and cosine measurement signal correction module includes: a sine differential amplifier unit, a sine offset DC drift unit, a sine amplitude adjustment unit, a cosine differential amplifier unit, a cosine offset DC drift unit, a cosine amplitude adjustment unit and an orthogonalization unit.
[0039] The sinusoidal differential amplifier unit receives two sinusoidal signals sin+ and sin- with a phase difference of 180° and processes them to obtain a sinusoidal differential amplification signal sin0 and provides it to the sinusoidal DC drift removal unit for processing to obtain a zero DC drift sinusoidal signal sin1. The amplitude of the zero-DC drift sinusoidal signal sin1 is adjusted by the sinusoidal amplitude adjustment unit to obtain the corrected sinusoidal signal sin2, which is provided to the orthogonalization unit;
[0040] The cosine differential amplifier unit receives two cosine signals cos+ and cos- with a pha...
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The invention discloses a sine and cosine measurement signal correction module and method. The sine and cosine measurement signal correction module is characterized by comprising a sine differential amplification unit, a sine DC drift removal unit, a sine amplitude adjustment unit, a cosine differential amplification unit, a cosine DC drift removal unit, a cosine amplitude adjustment unit, and an orthogonalization unit. The sine and cosine measurement signal correction method can be implemented without any software means. The module and method provided by the invention has the advantages that three major errors in sine and cosine measurement signals, i.e., DC drift, unequal amplitudes, and non-orthogonalization, can be corrected in a real-time manner, so that high-quality signals can be provided for subsequent subdivision, direction discernment and counting, which can improve the measurement precision and reduce loads on subsequent software correction.
Description
technical field [0001] The invention is applied to measurement occasions based on orthogonal sine wave measurement signals, such as gratings and laser interferometers, and is specifically a correction module and method for sinusine and cosine measurement signals. Background technique [0002] Measuring tools based on orthogonal sine wave signals such as grating sensors and laser interferometers have been widely used in various measurement occasions. The common signal processing process in industry is: photoelectric signal conversion - preamplification - differential amplification - identification orientation and subdivision. Ideally, two channels of perfect quadrature sine wave signals with zero DC drift, equal amplitude and 90° phase difference should be obtained after differential amplification (see Figure 5 As shown by the dotted line, its Lissajous diagram is an ellipse whose center is at the origin), thus providing accuracy guarantee for subsequent subdivision, directi...
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IPC IPC(8): H03B28/00H03M5/22G01D5/26
CPCG01D5/26G01D5/266H03B28/00H03M5/22
Inventor 卢荣胜穆文娟
Owner HEFEI UNIV OF TECH