Full-digital phase-shift micro-signal phase-lock detection method and equipment

Abstract

The invention belongs to the field of weak signal detection, and relates to an all-digital phase-shifting micro-signal phase-locking detection method, comprising: a mixed signal including a fixed-frequency weak signal to be detected and environmental noise, and phase-locking detection by a digitally phase-shifted reference signal, The single-chip ADC unit collects the phase-locked detection results and sends them to the single-chip input unit; the single-chip signal generation unit generates an excitation signal and a digital phase-shift signal with the same frequency as it. The digital phase-shift signal is multiplied by the mixed signal, and the multiplication result is passed through the The DC component is obtained through the filter, and the continuously changing DC component signal is collected by the ADC unit of the single-chip microcomputer, and the average value of a predetermined number of samples is obtained, and the weak signal is detected and judged according to the average value of the sample. The invention can perform high-precision quality detection on the passive equipment under harsh working environment, and provides a simple and efficient weak signal detection method.

Description

technical field [0001] The invention relates to the field of weak signal detection, in particular to an all-digital phase-shift micro-signal detection method Background technique [0002] With the rapid development and application of mobile communication technology, enterprises have higher and higher requirements for the ability of communication equipment to identify, collect and utilize useful signals in complex and harsh environments. When communication equipment is used in a harsh environment, its useful signal is often very low compared to the environmental noise. In order to ensure the quality of communication, a high-performance weak signal detection method is particularly important. In some application environments with high temperature, high humidity and high noise (such as industrial plants), due to the complexity and uncertainty of the noise, it is more difficult to detect and collect weak signals. Communication in this area cannot be completed normally, so there ...

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Problems solved by technology

[0005] In order to realize the identification, detection and utilization of weak signals with low signal-to-noise ratio in complex environments such as high noise, the existing phase-locking detection method is improved because the phase difference is uncontrollable, which leads to inaccurate detection results, and the analog phase-shifting circuit is susceptible to interference, high power consumption, and High complexity and other disadvantages, to improve the accuracy, practicability and convenience of the detection method, the present invention proposes an all-digital phase-shift micro-signal phase-locked detection method based on a single-chip microcomputer

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