CN115484137A - Receiver system based on phase undersampling and phase demodulation method - Google Patents
Receiver system based on phase undersampling and phase demodulation method Download PDFInfo
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- CN115484137A CN115484137A CN202211109261.8A CN202211109261A CN115484137A CN 115484137 A CN115484137 A CN 115484137A CN 202211109261 A CN202211109261 A CN 202211109261A CN 115484137 A CN115484137 A CN 115484137A
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/38—Demodulator circuits; Receiver circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
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Abstract
The invention provides a receiver system based on phase undersampling and a phase demodulation method based on phase undersampling, wherein the receiver system inputs radio frequency signals to a radio frequency amplification module for signal amplification, a phase demodulation module calculates the phase difference between the amplified radio frequency signals and feedback signals, and a loop filtering module filters and integrates the phase difference signals; the filtered phase difference signal enters an oscillator to generate a feedback signal and a signal to be sampled; the method comprises the steps that an under-sampling module is used for under-sampling a signal to be sampled, and a low-frequency modulation signal is output to a zero-crossing comparison module; converting the low-frequency modulation signal into a square wave signal through a zero-crossing comparison module; the square wave signal enters a frequency discrimination module to be subjected to digital demodulation, and a signal demodulation result of the radio frequency signal is obtained. According to the receiver system and the phase demodulation method based on the phase undersampling, which are provided by the embodiment of the invention, only one path of signal is utilized for signal demodulation, so that the power consumption is saved, the whole system is simple in structure, easy to integrate and good in demodulation effect.
Description
Technical Field
The invention relates to the technical field of signal phase modulation and demodulation, in particular to a receiver system based on phase undersampling and a phase demodulation method.
Background
In the existing low-intermediate frequency receiver system based on IQ quadrature demodulation, a quadrature local oscillator generated by a frequency synthesizer is mixed with an amplified radio frequency signal to obtain a low-intermediate frequency signal, a high frequency component is filtered to obtain two corresponding low-frequency analog signals containing modulation information, and finally the low-frequency analog signals are converted into digital signals to complete digital demodulation of a radio frequency front end of the receiver. However, because the receiver system has IQ two-path signals, the two-path signals not only increase power consumption drastically, but also cause the demodulation result of the two-path signals to be deteriorated because the two-path signals have the inevitable mismatch problem.
Disclosure of Invention
To solve the above problems, embodiments of the present invention provide a receiver system and a phase demodulation method based on phase undersampling.
In a first aspect, an embodiment of the present invention provides a receiver system based on phase undersampling, including: the device comprises a radio frequency amplification module, a phase discrimination module, a loop filtering module, an oscillator module, an under-sampling module, a zero-crossing comparison module and a frequency discrimination module; inputting radio frequency signals to a radio frequency amplification module for signal amplification, and inputting the amplified radio frequency signals to a phase discrimination module; calculating the phase difference between the amplified radio-frequency signal and the feedback signal by using a phase discrimination module, and outputting a phase difference signal to a loop filtering module; filtering the phase difference signal by using a loop filtering module, and integrating the filtered phase difference signal; the filtered phase difference signal enters an oscillator module to generate a feedback signal, the feedback signal is sent to a phase discrimination module, and the phase difference signal passing through the oscillator module is output to an under-sampling module; the phase difference signal output by the oscillator is subjected to undersampling through an undersampling module, and a low-frequency modulation signal is output to a zero-crossing comparison module; converting the low-frequency modulation signal into a square wave signal through a zero-crossing comparison module; the square wave signal enters a frequency discrimination module to be digitally demodulated to obtain a signal demodulation result of the radio frequency signal.
In a second aspect, an embodiment of the present invention further provides a phase demodulation method based on phase undersampling, including: amplifying an input radio frequency signal; calculating the phase difference between the amplified radio frequency signal and the feedback signal, and outputting a phase difference signal; filtering the phase difference signal, integrating the filtered phase difference signal, and generating a feedback signal by using an oscillator module according to the filtered phase difference signal; undersampling the phase difference signal passing through the oscillator module and outputting a low-frequency modulation signal; and converting the low-frequency modulation signal into a square wave signal, and carrying out digital demodulation on the square wave signal to obtain a demodulation result of the radio-frequency signal.
In the solutions provided in the foregoing first aspect and second aspect of the embodiments of the present invention, a radio frequency signal is input to a radio frequency amplification module for signal amplification in a receiver system based on phase undersampling, and the amplified radio frequency signal is input to a phase discrimination module; calculating the phase difference between the amplified radio-frequency signal and the feedback signal by using a phase discrimination module, and outputting a phase difference signal to a loop filtering module; filtering the phase difference signal by using a loop filtering module, and integrating the filtered phase difference signal; the filtered phase difference signal enters an oscillator to generate a feedback signal, the feedback signal is sent to a phase demodulation module, and the phase difference signal passing through the oscillator is output to an under-sampling module; the phase difference signal output by the oscillator is subjected to undersampling through an undersampling module, and a low-frequency modulation signal is output to a zero-crossing comparison module; converting the low-frequency modulation signal into a square wave signal through a zero-crossing comparison module; the square wave signal enters the frequency discrimination module to carry out digital demodulation to obtain a signal demodulation result of the radio frequency signal, and compared with the prior art that IQ two-path signals are adopted to carry out signal demodulation, the receiver provided by the invention has the following advantages: firstly, the receiver system only utilizes a single-path signal, saves power consumption, does not have the problem of demodulation mismatch caused by demodulation of two paths of signals, and has simple structure and easy integration; then, the receiver realizes signal demodulation through the undersampling module, the zero-crossing comparison module and the frequency discrimination module, can use a larger gain oscillator to achieve large bandwidth, eliminates the problem of sensitivity to high-power radio-frequency signals, and has good demodulation effect.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a block diagram of a receiver system based on phase undersampling according to an embodiment of the present invention;
fig. 2 shows a flowchart of a signal demodulation method based on phase undersampling according to an embodiment of the present invention.
Detailed Description
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Currently, a receiver for signal demodulation is a low intermediate frequency receiver based on IQ quadrature demodulation, such as a superheterodyne receiver, a low intermediate frequency receiver, a zero intermediate frequency receiver, and the like. In these structures, the receiver of this type generates an orthogonal local oscillator through a frequency synthesizer, the orthogonal local oscillator mixes the amplified radio frequency signal to obtain a low-intermediate frequency signal, a channel selection module filters a high-frequency component to obtain two corresponding low-frequency analog signals containing modulation information, and the low-frequency analog signals are finally converted into digital signals through an analog-to-digital conversion module, thereby completing digital demodulation of the radio frequency front end of the receiver. The receiver of the type demodulates data based on IQ two paths, and for a Q path, a circuit module of the receiver is a complete copy corresponding to the I path, so that most circuit modules in a receiver system need to be duplicated, and the power consumption of the system is increased. And because the whole system works in an open-loop state, in order to achieve a good suppression effect on blocking signals outside a bandwidth, it is inevitable to design each module on a relatively good linearity to improve the third-order intermodulation performance of the system, and such a module with high linearity is usually at the cost of large power consumption. In addition, in practical circuit implementation, the IQ two-path inevitably introduces amplitude and phase mismatch to deteriorate demodulation performance.
The other type is a phase tracking receiver for demodulating the frequency modulation signal, because the frequency modulation signal in the receiver is a constant envelope signal, and the signal amplitude does not carry modulation information, a mixer can be used as a phase discriminator instead of a frequency converter, and the oscillation frequency of an oscillator is controlled by using the phase discrimination result, so that the tracking of the output signal of the oscillator to the phase of the radio frequency input signal is realized. When the system is normally demodulated, the output of the I-type loop filtering module is the corresponding demodulation output result. Compared with a low intermediate frequency receiver based on IQ orthogonal demodulation, the receiver of the type only utilizes the I path or Q path of signals, and saves half of power consumption compared with a system for demodulating based on IQ two paths of signals; on the other hand, because the whole system is in a closed loop state, only the linearity of the frequency modulation curve of the oscillator influences the demodulation performance of the receiver. However, in this type of receiver, in order to achieve a good target channel demodulation effect, the gain of the oscillator needs to be relatively low, and the loop bandwidth is relatively narrow, so as to obtain a demodulation result with a larger amplitude from the output of the I-loop filtering module. Therefore, the oscillator is easily subjected to frequency pulling of a high-power signal at other frequency points, resulting in deterioration of demodulation performance. In addition, large static phase errors are introduced between the rf signal and the oscillator output due to random fluctuations in the free running frequency of the oscillator module with device, temperature, voltage, etc., which result in misalignment with the rf input signal. Due to the sine phase demodulation characteristic of the phase demodulator module, under the condition of large static phase error, the gain of the phase demodulator is sharply reduced, and the phase tracking capability of the phase tracker on modulation signals is seriously influenced.
Based on the above, the invention provides a receiver system based on phase undersampling, wherein a radio frequency signal is input to a radio frequency amplification module for signal amplification, and the amplified radio frequency signal is input to a phase discrimination module; calculating the phase difference between the amplified radio-frequency signal and the feedback signal by using a phase discrimination module, and outputting a phase difference signal to a loop filtering module; filtering the phase difference signal by using a loop filtering module, and integrating the filtered phase difference signal; the filtered phase difference signal enters an oscillator to generate a feedback signal and a signal to be sampled, the feedback signal is sent to a phase demodulation module, and the signal to be sampled is output to an under-sampling module; the method comprises the following steps that an under-sampling module is used for under-sampling a signal to be sampled output by an oscillator, and a low-frequency modulation signal is output to a zero-crossing comparison module; converting the low-frequency modulation signal into a square wave signal through a zero-crossing comparison module; the square wave signal enters the frequency discrimination module to carry out digital demodulation to obtain a signal demodulation result of the radio frequency signal, and compared with the prior art that IQ two-path signals are adopted to carry out signal demodulation, the receiver provided by the invention has the following advantages: firstly, the receiver system only utilizes a single-path signal, saves power consumption, does not have the problem of demodulation mismatch caused by demodulation of two paths of signals, and has simple structure and easy integration; then, the receiver realizes signal demodulation through an undersampling module, a zero-crossing comparison module and a frequency discrimination module, can use a larger gain oscillator to achieve large bandwidth, and eliminates the problem that a phase tracker is sensitive to high-power radio-frequency signals.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, the present application is described in further detail with reference to the accompanying drawings and the detailed description.
Example 1
Referring to fig. 1, a receiver system based on phase undersampling, the receiver system comprising: the circuit comprises a radio frequency amplification module 10, a phase detection module 20, a loop filtering module 30, an oscillator module 40, an undersampling module 50, a zero-crossing comparison module 60 and a frequency detection module 70.
The output end of the radio frequency amplification module 10 is connected to the input end of the phase discrimination module 20, the output end of the phase discrimination module 20 is connected to the input end of the loop filter module 30, the output end of the loop filter module 30 is connected to the input end of the oscillator module 40, the output end of the oscillator module 40 is connected to the input end of the under-sampling module 50 and the input end of the phase discrimination module 20, the output end of the under-sampling module 50 is connected to the input end of the zero-crossing comparison module 60, and the output end of the zero-crossing comparison module 60 is connected to the input end of the frequency discrimination module 70.
The input radio frequency signal is a voltage signal or a current signal. The rf amplification module 10 is configured to amplify an input rf signal and output an amplified voltage or current signal to the phase discrimination module 20; wherein, the amplitude of the output voltage or current signal and the amplitude of the input radio frequency signal are in a monotone positive correlation. The radio frequency signal from the antenna is amplified by the radio frequency amplification module 10 to the radio frequency signal within the predetermined frequency band bandwidth, so that the contribution of the internal noise of the circuit to the output noise is small, and excessive noise is not introduced.
The phase demodulation module 20 is configured to receive the amplified rf signal output by the rf amplification module 10 and the feedback signal output by the oscillator module 40, and calculate a phase error between the amplified rf signal and the feedback signal, where the phase demodulation signal is a sinusoidal signal of a voltage or a current. The phase detection gain curve obtained by the phase detection module 20 has a sine or cosine characteristic. Optionally, the phase detection module 20 comprises a gilbert mixer or a passive mixer.
The loop filter module 30 is configured to receive the phase error signal output by the phase discrimination module 20, filter the phase difference signal, and integrate the filtered phase error signal. Optionally, the loop filter module 30 is formed by a passive resistor-capacitor network or based on an operational amplifier.
Preferably, the loop filter module 30 is a band pass filter of type ii configuration. The band-pass filter with the type II structure has a pole at the direct current position on the frequency domain, plays an additional integral role, and leads the whole phase tracker loop to be of a type II structure together with the phase domain integral function corresponding to the oscillator. And filtering the phase difference signal by using a band-pass filter with a type II structure, filtering the phase difference signal lower than or higher than a preset frequency band, allowing the phase difference signal in the preset frequency band in the phase difference signal to pass through to obtain the filtered phase difference signal, and performing integration operation on the filtered phase error signal. After the loop filtering module 30 performs an integration operation on the input phase error signal, the phase discrimination module 20 calculates a phase difference between the amplified radio frequency signal and the feedback signal to be 90 °, and the output voltage is 0. When a system loop is stable, the input static phase error of the phase discrimination module is 90 degrees, the static phase error is reduced, the gain of the phase discrimination module cannot be sharply reduced, and the phase tracking capability of a receiver on modulation signals is improved. The loop filter module 30 has attenuation suppression effect on signals outside the limited bandwidth, so as to improve the demodulation performance of the system.
The oscillator module 40 is controlled by the output voltage of the loop filter module 30, and generates a constant signal with a certain frequency, and the oscillator module 40 outputs a feedback signal to the phase discrimination module 20 based on the input filtered phase difference signal, and outputs a signal to be sampled to the under-sampling module 50. The feedback signal and the signal to be sampled output by the oscillator module 40 are both low-frequency voltage or current signals, and the amplitude of the feedback signal and the signal to be sampled output by the oscillator module 40 and the amplitude of the input filtered phase difference signal are in a monotonic positive correlation relationship.
The undersampling module 50 undersamples the phase difference signal output by the oscillator module 40 by using a sampling clock signal with a preset frequency; the predetermined frequency is lower than the frequency of the output signal of the oscillator module 40 and at least higher than twice the frequency of the filtered phase difference signal. Due to the application of the undersampling circuit, the power consumption of the whole receiver system is greatly reduced, and the stability of the frequency of the oscillator during modulation is kept, so that the demodulation performance of the frequency discrimination module is improved.
The zero-crossing comparison module 60 sets the zero-crossing point to a preset threshold level, and converts the input sine or cosine signal into a square wave signal according to the preset threshold level.
The frequency discrimination module 70 is configured to demodulate according to the input signal, and the output signal and the input square wave signal have a monotonic positive correlation. Optionally, the frequency discriminator module performs demodulation by using a quadrocorrelator demodulation method.
The signal demodulation process by the receiver system based on phase undersampling is as follows:
inputting a radio frequency signal to the radio frequency amplification module 10 for signal amplification, and inputting the amplified radio frequency signal to the phase discrimination module 20;
calculating the phase difference between the amplified radio frequency signal and the feedback signal by using the phase discrimination module 20, and outputting a phase difference signal to the loop filtering module 30;
filtering the phase difference signal by using the loop filtering module 30, and integrating the filtered phase difference signal;
the filtered phase difference signal enters the oscillator module 40 to generate a feedback signal and a signal to be sampled, the feedback signal is sent to the phase discrimination module 20, and the signal to be sampled is output to the under-sampling module 50;
the signal to be sampled output by the oscillator module 40 is subjected to undersampling by the undersampling module 50, and a low-frequency modulation signal is output to the zero-crossing comparison module 60;
the low-frequency modulation signal is converted into a square wave signal by the zero-crossing comparison module 60;
the square wave signal enters the frequency discrimination module 20 for digital demodulation to obtain a signal demodulation result of the radio frequency signal.
The zero-crossing comparison module 60 sets the zero-crossing point to a preset threshold level, and converts the input sine or cosine signal into a square wave signal according to the preset threshold level.
The frequency discrimination module 70 is configured to demodulate according to the input signal, and the output signal and the input square wave signal have a monotonic positive correlation.
Fig. 2 is a flowchart of a phase demodulation method based on phase undersampling according to an embodiment of the present application. As shown in fig. 2, the method comprises the steps of:
201: amplifying an input radio frequency signal;
202: calculating the phase difference between the amplified radio frequency signal and the feedback signal, and outputting a phase difference signal;
203: filtering the phase difference signal, integrating the filtered phase difference signal, and generating a feedback signal and a signal to be sampled by using an oscillator according to the filtered phase difference signal;
204: undersampling a signal to be sampled output by the oscillator module, and outputting a low-frequency modulation signal;
205: and converting the low-frequency modulation signal into a square wave signal, and carrying out digital demodulation on the square wave signal to obtain a demodulation result of the radio-frequency signal.
In summary, the present invention provides a receiver system based on phase undersampling and a phase demodulation method based on phase undersampling, where the receiver system or the phase demodulation method inputs a radio frequency signal to a radio frequency amplification module for signal amplification, and the amplified radio frequency signal is input to a phase demodulation module; calculating the phase difference between the amplified radio-frequency signal and the feedback signal by using a phase discrimination module, and outputting a phase difference signal to a loop filtering module; filtering the phase difference signal by using a loop filtering module, and integrating the filtered phase difference signal; the filtered phase difference signal enters an oscillator module to generate a feedback signal and a signal to be sampled, the feedback signal is sent to a phase demodulation module, and the signal to be sampled is output to an under-sampling module; the method comprises the steps that an under-sampling module is used for under-sampling a signal to be sampled, and a low-frequency modulation signal is output to a zero comparison module; converting the low-frequency modulation signal into a square wave signal through a zero-crossing comparison module; the square wave signal enters a frequency discrimination module to carry out digital demodulation to obtain a signal demodulation result of the radio frequency signal. Compared with the IQ two-path signal demodulation in the related technology, the receiver of the invention has the following advantages: firstly, the receiver system only utilizes a single-path signal, saves power consumption, has no demodulation mismatch problem caused by demodulation of two paths of signals, has good demodulation effect, and has simple structure and easy integration; then, the receiver realizes signal demodulation through an undersampling module, a zero-crossing comparison module and a frequency discrimination module, can use a larger gain oscillator to achieve large bandwidth, and eliminates the problem that a phase tracker is sensitive to high-power radio-frequency signals.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A receiver system based on phase undersampling, comprising: the device comprises a radio frequency amplification module, a phase discrimination module, a loop filtering module, an oscillator module, an under-sampling module, a zero-crossing comparison module and a frequency discrimination module;
inputting a radio frequency signal to the radio frequency amplification module for signal amplification, and inputting the amplified radio frequency signal to the phase discrimination module;
calculating the phase difference between the amplified radio-frequency signal and a feedback signal by using the phase discrimination module, and outputting a phase difference signal to the loop filtering module;
filtering the phase difference signal by using the loop filtering module, and integrating the filtered phase difference signal;
the filtered phase difference signal enters the oscillator module to generate a feedback signal and a signal to be sampled, the feedback signal is sent to the phase demodulation module, and the signal to be sampled is output to the under-sampling module;
the signal to be sampled output by the oscillator module is subjected to undersampling through the undersampling module, and a low-frequency modulation signal is output to the zero-crossing comparison module;
converting the low-frequency modulation signal into a square wave signal through the zero-crossing comparison module;
and the square wave signal enters the frequency discrimination module to be digitally demodulated to obtain a signal demodulation result of the radio frequency signal.
2. The phase undersampling-based receiver system according to claim 1, wherein the undersampling the signal to be sampled output by the oscillator module by the undersampling module, and outputting the low-frequency modulation signal to the zero-crossing comparing module, comprises:
the under-sampling module carries out under-sampling on the signal to be sampled output by the oscillator module by using a sampling clock signal with a preset frequency; the preset frequency is lower than the frequency of the signal to be sampled output by the oscillator module and at least higher than the frequency of the phase difference signal after twice filtering.
3. The phase undersampling based receiver system of claim 1, wherein the loop filter module is a band pass filter of type ii architecture;
filtering and integrating the phase difference signal by using the loop filtering module, comprising:
and filtering the phase difference signal by using the band-pass filter with the type II structure, filtering the phase difference signal which is lower than or higher than a preset frequency band, allowing the phase difference signal in the preset frequency band in the phase difference signal to pass through to obtain a filtered phase difference signal, and performing integration operation on the filtered phase error signal.
4. The phase undersampling-based receiver system of claim 3, wherein the phase detection module calculates the phase difference between the amplified radio frequency signal and the feedback signal to be 90 ° and the output voltage to be 0 after integrating the input phase error signal through the loop filter module.
5. The phase undersampling based receiver system according to claim 1, wherein said radio frequency signal is a voltage signal or a current signal;
the inputting the radio frequency signal to the radio frequency amplifying module for signal amplification, and inputting the amplified radio frequency signal to the phase discriminating module, includes:
the radio frequency amplification module is used for amplifying an input radio frequency signal and outputting an amplified voltage or current signal to the phase discrimination module; wherein the amplitude of the output voltage or current signal is in a monotonic positive correlation with the amplitude of the input radio frequency signal.
6. A phase undersampling based receiver system according to any of claims 1-4, characterized in that the phase difference signal generated by the phase detection module is a sinusoidal signal of voltage or current.
7. The phase undersampling-based receiver system of claim 1, wherein the feedback signal and the signal to be sampled output by the oscillator module have a monotonic positive correlation with the amplitude of the input filtered phase difference signal.
8. The phase undersampling based receiver system according to claim 1, wherein the low frequency modulation signal inputted to the zero-crossing comparison module is a sine or cosine signal, and the converting of the low frequency modulation signal into a square wave signal by the zero-crossing comparison module comprises:
the zero-crossing comparison module sets the zero-crossing point as a preset threshold level and converts the input sine or cosine signal into a square wave signal according to the preset threshold level.
9. The phase undersampling-based receiver system according to claim 1, wherein the frequency discrimination module outputs a signal having a monotonic positive correlation with the input square wave signal amplitude.
10. A phase demodulation method based on phase undersampling is characterized by comprising the following steps: amplifying an input radio frequency signal;
calculating the phase difference between the amplified radio frequency signal and a feedback signal, and outputting a phase difference signal;
filtering the phase difference signal, integrating the filtered phase difference signal, and generating a feedback signal and a signal to be sampled by using an oscillator according to the filtered phase difference signal;
undersampling a signal to be sampled output by the oscillator module, and outputting a low-frequency modulation signal;
and converting the low-frequency modulation signal into a square wave signal, and carrying out digital demodulation on the square wave signal to obtain a demodulation result of the radio frequency signal.
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