CN114944840A - Multi-channel weak signal multi-frequency positioning digital phase locking method and amplifier system - Google Patents
Multi-channel weak signal multi-frequency positioning digital phase locking method and amplifier system Download PDFInfo
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- H—ELECTRICITY
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- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
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- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/08—Details of the phase-locked loop
- H03L7/085—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
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Abstract
The invention discloses a multi-frequency positioning digital phase-locking method and an amplifier system of a multi-channel weak signal, wherein the system comprises the following steps: the device comprises a signal to be detected input module, a reference signal module, a phase-sensitive detection module and a detection result display module; the phase locking method comprises the following steps: firstly, inputting a multi-channel signal to be detected, summing the multi-channel signal to be detected and combining the multi-channel signal to be detected into a signal; then setting the frequency of a reference signal according to the frequency of the signal to be detected; then inputting the combined to-be-detected signal and different reference signals into a phase-sensitive detector, and calculating the signal obtained by the phase-sensitive detector to obtain the amplitude and the phase of a corresponding frequency signal; and finally, inputting the calculated signal amplitude into a display module to display the result of phase-locked amplification. The method can effectively perform multi-frequency positioning on the multi-channel weak signals, effectively detect the amplitude and the phase of the signals, and has higher calculation efficiency.
Description
Technical Field
The invention belongs to the technical field of multi-frequency weak signal detection equipment, and particularly relates to a multi-channel weak signal multi-frequency positioning digital phase-locked amplifier.
Background
The lock-in amplifier has received much attention from researchers as a weak signal detection means commonly used in the field of weak signals, and has a wide application in the fields of weak signal detection, weak damage detection and the like, and many attempts have been made to improve the lock-in amplifier. The lock-in amplifier cannot achieve a good effect on the detection of the multi-frequency weak signals because the lock-in amplifier is limited by the correlation relationship between signals.
At present, a digital phase-locked amplifier is widely used for detecting a single-frequency weak signal, wherein the dual-channel orthogonal vector type digital phase-locked amplifier is widely applied, for example, a patent applied to the university of geology (wuhan) in china, "a digital phase-locked amplification processing method based on accurate automatic frequency tracking of an FPGA", is applied to the following fields: cn201810717251. x; the patent applied by the Hunan Wuling Power technology Limited and Wuling Power Limited' is a digital phase-locked amplification processing method based on interpolation DFT signal synchronization, and the application number is as follows: CN202111408144.7 and the like; these methods can only detect single frequency weak signals. There are also digital lock-in amplifiers for multiple channels, such as the "synchronous multiple channel digital lock-in amplifier" patent applied by cantonese scientific instruments ltd, application No.: 202010678683.1, adopting multi-channel input, single reference signal to phase-sensitive detect the signals to be detected of multiple channels, although saving the instrument volume and reducing the instrument manufacturing cost, the time cost is greatly increased, which not only reflects the frequency matching of the reference signal, but also reflects the time cost generated when the filter carries out multiple filtering.
Disclosure of Invention
Aiming at the problem that a digital phase-locked amplifier cannot rapidly and efficiently detect the amplitude and the phase of a multichannel weak multifrequency signal, the invention provides a multichannel weak signal multifrequency positioning digital phase-locked amplifier, a digital phase-locked amplification technology is used as a basic method for detecting the weak signal, a multichannel reference signal and a plurality of phase sensitive detectors are used as a multichannel weak multifrequency signal rapid detection method, and an oscilloscope is used as a final display means of the amplitude, the phase and a detection result to ensure that the multichannel weak multifrequency signal can be detected.
In order to realize the purpose, the invention adopts the technical scheme that:
a multi-frequency positioning digital phase-locking method of multi-channel weak signals comprises the following steps:
and 3, after the reference signal and the original signal are processed in the phase-sensitive detector, outputting the result to a display module to observe the detection result of the amplitude and the phase of the signal to be detected.
Further, the step 1 of adding and summing the L signals to be measured and a white noise signal includes the following specific steps:
step 11, synchronously inputting L signals to be detected and a white noise generated randomly into a summator for addition and synthesis to obtain an input signal;
and step 12, dividing the input signal processed by the summator into a plurality of paths of same signals, respectively inputting the signals into the phase-sensitive detector for digital phase-locked amplification, and inputting the signals into the oscilloscope for comparison with a detection result.
Further, the step 2 includes the following processes:
step 21, setting 1 reference signal with amplitude as a unit for each signal to be detected, generating L reference signals, wherein the frequency of each reference signal is the same as that of the corresponding signal to be detected, and constructing two in-phase orthogonal reference signals for each reference signal aiming at the L reference signals with different frequencies;
step 22, inputting the two generated reference signals and the input signal into the same phase-sensitive detector respectively;
step 23, low-pass filtering the two reference signals and the result of the correlation operation of the signal to be detected respectively to obtain two direct current signals;
step 24, respectively squaring and adding the two paths of direct current signals, and squaring the addition result to obtain an amplitude curve of the signal to be detected;
step 25, solving the quotient inverse tangent function value of the two paths of direct current signals to obtain a phase curve of the signal to be measured;
and step 26, multiplying the amplitude detection result by a reference signal to obtain a signal detection result.
Further, after the reference signal and the original signal are processed in the phase sensitive detector in step 3, the result is output to a display module for displaying the amplitude, the phase and the detection result, and the method comprises the following specific steps:
step 31, respectively inputting the obtained L amplitudes and phases of the signal to be detected into an oscilloscope to display results;
and step 32, adding the L signal processing results of the signals to be detected, combining the L signal processing results into a signal, inputting the signal into an oscilloscope, and comparing and displaying the signal with the original signal input into the oscilloscope.
The present application further provides a multi-channel weak signal multi-frequency positioning digital lock-in amplifier system, the amplifier system comprising:
the input signal module adds and sums L signals to be detected and a white noise signal and combines the L signals to be detected and the white noise signal into an input signal;
the reference signal module is used for setting 1 reference signal for each signal to be detected, and the frequency of the reference signal is the same as that of the corresponding signal to be detected;
the phase-sensitive detector module is used for receiving the input signal and the reference signal generation module to obtain detection results of the amplitude and the phase of the signal to be detected;
and the result display module is used for observing the detection results of the amplitude and the phase of the signal to be detected.
Compared with the prior art, the invention has the following beneficial effects:
the multi-channel weak signal detection method and the multi-channel weak signal detection device simultaneously detect multi-channel to-be-detected signals by using multi-channel reference signals, and simultaneously detect the amplitudes and phases of a plurality of frequency components of the multi-frequency signals by using a plurality of phase sensitive detectors and a plurality of low-pass filters, so that the multi-channel weak signal detection efficiency is improved; the signals of multiple channels are added and combined into one signal, so that the number of interfaces of the input phase-locked amplifier is reduced, the phase-locked amplifier is also suitable for weak multi-frequency signals of a single channel, and the application range of the phase-locked amplifier is enlarged. The invention can effectively detect a plurality of frequencies of the multichannel weak signal and effectively detect the amplitude and the phase of each frequency signal.
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FIG. 1 is a schematic block diagram of the principle of the present invention;
FIG. 2 is an amplitude of a frequency corresponding to a mixing signal detected in the present invention;
FIG. 3 is a phase of a mixing signal detected in the present invention with respect to a frequency;
FIG. 4 is a graph comparing the detection result with the original input signal in the present invention;
fig. 5 is a schematic circuit diagram of the phase-sensitive detection module.
Detailed Description
The present invention will be further described with reference to the following examples.
Example 1
The present embodiment is a multi-frequency positioning digital lock-in amplifier system of multi-channel weak signal, as shown in fig. 1, the system includes a signal to be detected input module, a reference signal module, a phase-sensitive detection module and a detection result display module. The amplifier system includes:
the input signal module adds and sums L signals to be detected and a white noise signal and combines the L signals to be detected and the white noise signal into an input signal;
the reference signal module is used for setting 1 reference signal for each signal to be detected, and the frequency of the reference signal is the same as that of the corresponding signal to be detected;
the phase-sensitive detector module is used for receiving the input signal and the reference signal generation module to obtain detection results of the amplitude and the phase of the signal to be detected;
and the result display module is used for observing the detection results of the amplitude and the phase of the signal to be detected.
Example 2
The invention provides a multi-frequency positioning digital phase-locking method of multi-channel weak signals based on the multi-frequency positioning digital phase-locking amplifier system of the multi-channel weak signals, which comprises the following specific steps:
Synchronously inputting L signals to be detected and a white noise generated randomly into a summator for addition and synthesis to obtain a channel signal;
let the mixing signal contain different L kinds of frequency components with frequencies f 1 ＝n 1 ×f、f 2 ＝n 2 ×f、…、f L ＝n L ×f(n 1 ≠n 2 ≠…≠n L ). Amplitude values of A 1 、A 2 、…、A L . Phase is respectively phi 1 、Φ 2 、…、Φ L . Sampling frequency f s ＝N×f(N＞2max(n 1 ,n 2 ,…,n L ) And the number of sampling periods is q, and the total number of sampling points is M ═ nxq.
Let an input signal V s (k) Comprises the following steps:
and 2, setting L reference signals, wherein the frequencies of the reference signals are the same as the frequencies of the original signals, and respectively inputting the L reference signals into the phase sensitive detectors to which the original signals with the corresponding frequencies are input.
Generating L reference signals, wherein the frequency of the L reference signals is respectively the same as that of the L to-be-detected signals, and aiming at L different frequency components, two in-phase orthogonal reference signals are respectively constructed;
inputting the two generated reference signals and the to-be-detected signal with the same frequency into the same phase-sensitive detector;
performing low-pass filtering on the two reference signals and the result of the correlation operation of the to-be-detected signal to obtain two direct current signals;
then V s (k) And
are respectively a cross-correlation function of
V s (k) And
are respectively a cross-correlation function of
…
Respectively squaring and adding the two paths of direct current signals, and squaring the addition result to obtain the amplitude of the signal to be detected; and solving the quotient of the two paths of direct current signals for the inverse tangent function value to obtain the phase of the signal to be detected. The amplitude and phase for each frequency is then:
and multiplying the amplitude detection result by a path of generated reference signal to obtain a signal detection result.
And 3, after the reference signal and the original signal are processed in the phase-sensitive detector, outputting the result to a display module for displaying the amplitude and the detection result.
The L amplitudes and phases of the signal to be detected obtained are respectively input into an oscilloscope to display results, such as the amplitude detection result shown in fig. 2 and the phase detection result shown in fig. 3. In this example, 4-channel weak signals with L being 4, that is, 4-frequency positioning phase-locked amplification is selected as an example, and the amplitudes and phases of 4 weak signals with different frequencies are detected simultaneously;
the L processed signals of the signal to be detected obtained are added and combined into one signal, the signal is input into an oscilloscope and is compared with an original signal input into the oscilloscope for display, as shown in a signal detection result shown in fig. 4, a black line is a signal input into the lock-in amplifier after the original 4 input signals are added with white noise, and a red line is a result detected by the lock-in amplifier.
The above description is only an example of the 4-channel weak signal digital phase-locked amplifier selected by the present invention, and it should be noted that: it will be apparent to those skilled in the art that the method of the present invention can be applied to other similar multi-channel weak signal processing and that several modifications and refinements can be made without departing from the principle of the present invention, and these modifications and refinements should be regarded as the protection scope of the present invention.
Claims (5)
1. A multi-frequency positioning digital phase locking method of a multi-channel weak signal is characterized by comprising the following steps:
step 1, adding and summing L signals to be detected and a white noise signal, combining the L signals to be detected and the white noise signal into an input signal, and respectively inputting the input signal into L phase sensitive detectors;
step 2, setting 1 reference signal for each signal to be detected, wherein the reference signals respectively correspond to the frequency of one signal to be detected, and inputting L reference signals and an input signal into a phase-sensitive detector for detection;
and 3, after the reference signal and the original signal are processed in the phase-sensitive detector, outputting the result to a display module to observe the detection results of the amplitude and the phase of the signal to be detected.
2. The multi-channel weak signal multi-frequency positioning digital phase-locked amplifier according to claim 1, wherein the step 1 of summing the L signals to be measured and a white noise signal comprises the following specific steps:
step 11, synchronously inputting L signals to be detected and a white noise generated randomly into a summator for addition and synthesis to obtain an input signal;
and step 12, dividing the input signal processed by the summator into a plurality of paths of same signals, respectively inputting the signals into the phase-sensitive detector for digital phase-locked amplification, and inputting the signals into the oscilloscope for comparison with a detection result.
3. The multi-channel weak signal multi-frequency positioning digital phase-locked amplifier according to claim 2, wherein the step 2 comprises the following steps:
step 21, setting 1 reference signal with amplitude as one unit for each signal to be detected, generating L reference signals, wherein the frequency of each reference signal is the same as that of the corresponding signal to be detected, and constructing two in-phase orthogonal reference signals for each reference signal aiming at the L reference signals with different frequencies;
step 22, inputting the two generated reference signals and the input signal into the same phase-sensitive detector respectively;
step 23, low-pass filtering the two reference signals and the result of the correlation operation of the signal to be detected respectively to obtain two direct current signals;
24, respectively squaring and adding the two paths of direct current signals, and squaring the addition result to obtain an amplitude curve of the signal to be detected;
step 25, calculating the quotient inverse tangent function value of the two paths of direct current signals to obtain a phase curve of the signal to be measured;
and step 26, multiplying the amplitude detection result by a reference signal to obtain a signal detection result.
4. The multi-channel weak signal multi-frequency positioning digital phase-locked amplifier according to claim 3, wherein the step 3 comprises the following specific steps of processing the reference signal and the original signal in the phase sensitive detector, and outputting the result to the display module for displaying the amplitude, the phase and the detection result:
step 31, respectively inputting the obtained L amplitudes and phases of the signal to be detected into an oscilloscope to display results;
and step 32, adding the L signal processing results of the signals to be detected, combining the L signal processing results into a signal, inputting the signal into an oscilloscope, and comparing and displaying the signal with the original signal input into the oscilloscope.
5. A multi-channel weak signal multi-frequency positioning digital lock-in amplifier system, comprising:
the input signal module adds and sums L signals to be detected and a white noise signal and combines the L signals to be detected and the white noise signal to form an input signal;
the device comprises a reference signal module, a signal processing module and a signal processing module, wherein the reference signal module is used for setting 1 reference signal for each signal to be detected, and the reference signal has the same frequency as the corresponding signal to be detected;
the phase-sensitive detector module is used for receiving the input signal and the reference signal generation module to obtain detection results of the amplitude and the phase of the signal to be detected;
and the result display module is used for observing the detection results of the amplitude and the phase of the signal to be detected.
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| CN115824394A (en) * | 2023-01-06 | 2023-03-21 | 山东省科学院海洋仪器仪表研究所 | Weak signal phase alignment method in noise measurement |
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| CN115824394A (en) * | 2023-01-06 | 2023-03-21 | 山东省科学院海洋仪器仪表研究所 | Weak signal phase alignment method in noise measurement |
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