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Delay orthogonal digital intermediate-frequency phase discrimination method for detecting phase difference accurately

A digital intermediate frequency and quadrature digital technology, applied in the field of phase difference measurement, can solve the problems of low measurement accuracy, high hardware cost, and slow measurement speed of measurement methods

Active Publication Date: 2011-09-28
中航空管系统装备有限公司
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Problems solved by technology

[0006] Existing measurement methods require complex hardware support and high hardware costs; at the same time, the existing measurement methods have slow measurement speed and low measurement accuracy, which cannot meet the rapidly developing fields of industrial automation, intelligent control, and communication electronics.

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  • Delay orthogonal digital intermediate-frequency phase discrimination method for detecting phase difference accurately
  • Delay orthogonal digital intermediate-frequency phase discrimination method for detecting phase difference accurately

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Embodiment Construction

[0020] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.

[0021] see figure 1 , the present invention measures the phase difference between two input signals with the same frequency , the present invention provides a new phase detection method, i.e. delayed quadrature digital intermediate frequency phase detection method, the method comprises the following steps:

[0022] In the first step, the frequency of the two channels is f and the amplitude is U respectively. A and U B , the phase difference is RF signal , U B cos(2πft) performs band-pass sampling and band-pass filtering respectively, and then performs digital down-conversion to obtain two intermediate frequency frequencies f I Digital IF bandpass signal. in

[0023] When performing bandpass sampling in this step, it is necessary to se...

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Abstract

The invention discloses a delay orthogonal digital intermediate-frequency phase discrimination method for detecting phase difference accurately. The method comprises the flowing steps of: 1, firstly performing band-pass sampling and band-pass filtering on two radio frequency signals with the same frequency respectively to realize digital frequency down conversion so as to obtain corresponding digital intermediate-frequency band-pass signals; 2, obtaining the sine component and the cosine component of the phase difference of the two paths of signals synchronously; and 3, comparing the sine component with the cosine component, eliminating amplitude influence to obtain the tangent value of the phase difference, and finally accurately calculating the phase difference according to the tangent value of the phase difference and the symbols of the sine component and the cosine component of the phase difference. According to the method for detecting phase difference, hardware cost can be reduced greatly, and phase discrimination performance can be improved.

Description

technical field [0001] The invention relates to an electrical measurement technology, and specifically designs a phase difference measurement technology. Background technique [0002] Amplitude, phase, and frequency are the three elements of a sine wave, and the phase difference is an important parameter to study the relationship between two signals of the same frequency. [0003] The difference between the phases of two alternating currents with the same frequency is called phase difference, or phase difference. These two alternating currents with the same frequency can be two alternating currents, two alternating voltages, two alternating electromotive forces, or any two of these three quantities. The phase difference of two sinusoidal quantities with the same frequency is equal to the initial phase difference. It is a constant that does not change with time. [0004] The measurement of phase difference is a basic content of electrical measurement, and its meaning is to ...

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Application Information

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IPC IPC(8): G01R25/00
Inventor 张俊强张海辉吴鑫炜郭鸿滨
Owner 中航空管系统装备有限公司
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