Sinusoidal signal phase difference tracing system and method

Abstract

The invention provides a sinusoidal signal phase difference tracing system and method, and belongs to the field of precision measurement. The sinusoidal signal phase difference tracing system comprises a plurality of same phase shift modules; each phase shift module comprises a signal input terminal and a signal output terminal; the signal input terminal of the first phase shift module is the signal input terminal of the system; a signal output terminal of the first phase shift module is connected with the signal input terminal of the second phase shift module, a signal output terminal of thesecond phase shift module is connected with the signal input terminal of the third phase shift module, and so on, a signal output terminal of the last phase shift module is the signal output terminalof the system. Through cascading of the phase shift modules, the output signal of the last module is enabled to be close to the input signal of the first module in phase. And orthogonal decompositionmeasurement can be carried out by utilizing the zero-degree left and right phases, so that the tracing problem of the non-zero-degree phase difference of the sinusoidal signal is solved, especially the tracing problem of the orthogonal phase is solved, and the tracing of any phase difference is realized.

Description

technical field [0001] The invention belongs to the field of precision measurement, and in particular relates to a sinusoidal signal phase difference traceability system and method. Background technique [0002] Phase difference traceability technology plays an important role in precision measurement. For example, in the field of electricity, traceability of power and loss requires phase difference traceability as support. In the field of length, dimension measurement and spatial positioning also depend on the phase of two signals Poor precise traceability. [0003] The difference measurement technology can be applied to the accurate traceability of the phase difference around 0 degrees. The vector difference of the two signals with similar amplitudes and the reference signal are decomposed orthogonally through a multiplier, and the proportional difference and the phase difference of the two signals can be calculated. [0004] However, for the case of large phase differenc...

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Problems solved by technology

[0004] However, for the case of large phase difference, since the vector difference between the two signals is already large, especially in the case of quadrature phase, the vector difference has exceeded the signal itself, so the above-mentioned difference measurement technology is difficult to guarantee the measurement accuracy of the signal after orthogonal decomposition , so it cannot be used to trace the source of the phase difference

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