Carrier signal demodulation method, device and system

Abstract

The present disclosure relates to the technical field of signal demodulation, and discloses a carrier signal demodulation method, device and system, the method comprising: when receiving two subcarrier signals, determining the effective subcarrier signal of each subcarrier signal; determining the effective sampling phase control signal of each effective subcarrier signal; calculating the signal-to-noise ratio of each effective subcarrier signal based on each effective subcarrier signal and its effective sampling phase control signal; obtaining the combined carrier signal of the two effective subcarrier signals according to the combining mode indicated by the comparison result of the signal-to-noise ratio of the two effective subcarrier signals and the signal-to-noise ratio threshold, and sending the combined carrier signal to the signal demodulator for demodulation. The above method realizes more efficient and reliable carrier signal demodulation by identifying the effective subcarrier in advance, dynamically generating the sampling phase control signal, accurately calculating the signal-to-noise ratio and intelligently selecting the combining mode, which significantly improves the overall performance and reduces the bit error rate.

Description

Technical Field

[0001] The present disclosure relates to the technical field of signal demodulation, for example, to a carrier signal demodulation method, device and system. Background Art

[0002] In radar, sonar and communication systems, in order to effectively transmit digital information, phase shift keying (PSK) modulation is often used, among which BPSK (Binary Phase Shift Key) and QPSK (Quadri Phase Shift Keying) are both commonly used phase shift keying modulation methods.

[0003] The demodulation process of the carrier signal in the related art includes: the signal receiver first captures the radio frequency (RF) carrier signal containing information from the antenna. The received carrier signal is sent to the orthogonal demodulator, which decomposes it into two subcarrier signals. The two subcarrier signals in analog form after orthogonal demodulation are then converted into digital form through an analog-to-digital converter. The digitized subcarrier signals are then filtered, and the two subcarrier signals after filtering are processed using a fixed combining algorithm to generate a combined carrier signal. Finally, the obtained combined carrier signal is sent to the signal demodulator, which is responsible for demodulating the combined carrier signal.

[0004] Although the related technology can realize the basic signal reception and demodulation functions, it is impossible to determine the position of the effective subcarrier in advance, and all received signal segments will be processed, which not only increases the unnecessary computational burden, but may also lead to low processing efficiency. Moreover, the combining algorithm does not dynamically select the optimal path according to the specific characteristics of the two subcarrier signals, but instead fixedly selects a certain path or a certain combining mode. This approach easily leads to the selection of a path with a poor signal-to-noise ratio, thereby reducing the overall demodulation performance and increasing the bit error rate. When both signals have a good signal-to-noise ratio, simply selecting one path or a single combining mode fails to fully utilize the advantages of the two signals and fails to maximize the demodulation effect. It can be seen that the related technology, however, cannot identify the effective subcarrier in advance and the fixed combining algorithm is not adaptive, which will lead to problems such as waste of computing resources, low processing efficiency, reduced demodulation performance and increased bit error rate.

[0005] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0006] In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not an extensive review, nor is it intended to identify key / critical components or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

[0007] The embodiments of the present disclosure provide a carrier signal demodulation method, device and system, which can achieve more efficient and reliable carrier signal demodulation, significantly improve overall performance and reduce bit error rate.

[0008] According to a first aspect of the present disclosure, a carrier signal demodulation method is provided, comprising:

[0009] When two subcarrier signals are received, determining a valid subcarrier signal of each subcarrier signal;

[0010] Determine an effective sampling phase control signal for each effective subcarrier signal, wherein the effective sampling phase control signal is used to indicate the phase of the peak and the trough of the effective subcarrier signal;

[0011] Calculate the signal-to-noise ratio of each effective subcarrier signal based on each effective subcarrier signal and its effective sampling phase control signal;

[0012] According to the combining mode indicated by the comparison result of the signal-to-noise ratio of the two effective subcarrier signals and the signal-to-noise ratio threshold, a combined carrier signal of the two effective subcarrier signals is obtained, and the combined carrier signal is sent to the signal demodulator for demodulation.

[0013] In some embodiments, when two subcarrier signals are received, determining a valid subcarrier signal of each subcarrier signal includes:

[0014] When receiving two subcarrier signals, determining a noise threshold value of each subcarrier signal;

[0015] The part of the extreme value in each subcarrier signal whose absolute value is greater than the noise threshold value is determined as the effective subcarrier signal of each subcarrier signal.

[0016] In some embodiments, when two subcarrier signals are received, determining a noise threshold value of each subcarrier signal includes:

[0017] When two subcarrier signals are received, for each subcarrier signal, the previous sampling point data of the subcarrier signal is obtained;

[0018] Divide the previous sampling point data of the subcarrier signal into multiple sub-sampling point data segments, and calculate the maximum value of each sub-sampling point data segment;

[0019] Based on the maximum value of each segment of sub-sampling point data of each channel of sub-carrier signal, the noise threshold value of the effective sub-carrier signal of each channel of sub-carrier signal is determined.

[0020] In some embodiments, determining the portion of the extreme value of each subcarrier signal whose absolute value is greater than the noise threshold value as the valid subcarrier signal of each subcarrier signal includes:

[0021] Obtaining a filtered output signal of each subcarrier signal based on the filter;

[0022] The part of the filtered output signal of each subcarrier signal whose absolute value is greater than the noise threshold value is determined as the effective subcarrier signal of each subcarrier signal.

[0023] In some embodiments, determining the effective sampling phase control signal of each effective subcarrier signal includes:

[0024] For each effective subcarrier signal, detecting the zero crossing point of the effective subcarrier signal;

[0025] According to the number of sampling points in each cycle of the effective subcarrier signal, the numerical cycle range of the sampling phase control signal and the numerical value of the sampling phase control signal at the zero crossing point detected for the first time are configured;

[0026] Detecting the number of matches between the value of the sampling phase control signal at subsequent zero crossings of the effective subcarrier signal and the value of the sampling phase control signal at the first detected zero crossing;

[0027] When the number of matches reaches a matching number threshold, a valid sampling phase control signal that conforms to a valid subcarrier signal is obtained.

[0028] In some embodiments, calculating the signal-to-noise ratio of each effective subcarrier signal based on each effective subcarrier signal and its effective sampling phase control signal includes:

[0029] For each effective subcarrier signal, based on the effective subcarrier signal and its effective sampling phase control signal, a specified number of extreme values ​​of the effective subcarrier signal are obtained, wherein the extreme values ​​of the effective subcarrier signal are peak values ​​and trough values ​​within one period;

[0030] Calculating an average of the absolute values ​​of a specified number of extreme values ​​of the effective subcarrier signal;

[0031] The signal-to-noise ratio of the effective subcarrier signal is calculated based on the noise threshold value of the effective subcarrier signal and the average value of the absolute values ​​of a specified number of extreme values.

[0032] In some embodiments, obtaining a combined carrier signal of two effective subcarrier signals according to a combining mode indicated by a comparison result of the signal-to-noise ratios of the two effective subcarrier signals and a signal-to-noise ratio threshold includes: when the signal-to-noise ratios of the two effective subcarrier signals are both greater than the signal-to-noise ratio threshold, using the effective subcarrier signal with the largest signal-to-noise ratio as the combined carrier signal of the two effective subcarrier signals.

[0033] In some embodiments, obtaining a combined carrier signal of two valid subcarrier signals according to a combining mode indicated by a comparison result of the signal-to-noise ratio of the two valid subcarrier signals with a signal-to-noise ratio threshold includes:

[0034] When the signal-to-noise ratio of at least one valid subcarrier signal is not greater than the signal-to-noise ratio threshold, the number of extreme value pairs of two valid subcarrier signals with the same polarity at the same position is calculated;

[0035] A combined carrier signal of two effective subcarrier signals is obtained according to a combining mode indicated by a comparison result of the number of extreme value pairs with the same polarity and a specified number.

[0036] According to a second aspect of the present disclosure, a carrier signal demodulation device is provided, comprising a processor and a memory storing program instructions, wherein the processor is configured to execute the carrier signal demodulation method provided according to the first aspect of the present disclosure when running the program instructions.

[0037] According to a second aspect of the present disclosure, there is provided a carrier signal demodulation system, comprising a signal receiver, an orthogonal demodulator, a carrier signal demodulation device and a signal demodulator;

[0038] The signal receiver is configured to receive the original carrier signal and send the original carrier signal to the orthogonal demodulator;

[0039] The orthogonal demodulator is configured to demodulate the original carrier signal into two sub-carrier signals and send the two sub-carrier signals to the carrier signal demodulation device;

[0040] The carrier signal demodulation device is configured to perform the carrier signal demodulation method provided according to the first aspect of the present disclosure;

[0041] The signal demodulator is configured to demodulate the combined carrier signal.

[0042] The carrier signal demodulation method, device and system provided by the embodiments of the present disclosure can achieve the following technical effects:

[0043] The carrier signal demodulation method provided by the embodiment of the present disclosure, when receiving two subcarrier signals, first determines the valid subcarrier signal of each channel. This step enables the system to centrally process valid information and avoid unnecessary processing of invalid signal segments, thereby significantly reducing the waste of computing resources and improving processing efficiency. Next, an effective sampling phase control signal is generated for each valid subcarrier signal. These control signals accurately indicate the phases of the peaks and troughs of the valid subcarrier signals, ensuring that subsequent processing is based on the most accurate data, enhancing the adaptability and demodulation accuracy of the system. Subsequently, by accurately locating the peaks and troughs of the valid subcarrier signals, the system can accurately calculate the signal-to-noise ratio of each subcarrier signal. This process provides a reliable basis for further optimization processing. Finally, the optimal combining mode is selected based on the comparison result of the signal-to-noise ratio of the two valid subcarrier signals with the preset threshold. This intelligent combining strategy based on the signal-to-noise ratio ensures that the system always selects the path or combination with the best signal-to-noise ratio, maximizes the demodulation effect, and reduces the bit error rate. In summary, this method achieves more efficient and reliable carrier signal demodulation by identifying effective subcarriers in advance, dynamically generating sampling phase control signals, accurately calculating the signal-to-noise ratio, and intelligently selecting the combining mode, which significantly improves the overall performance and reduces the bit error rate.

[0044] The foregoing general description and the following description are exemplary and explanatory only and are not intended to limit the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] One or more embodiments are exemplarily described by corresponding drawings, which do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements, and the drawings do not constitute a scale limitation, and wherein:

[0046] Figure 1 is a schematic diagram of a carrier signal demodulation system provided by an embodiment of the present disclosure;

[0047] Figure 2 is a schematic diagram of another carrier signal demodulation system provided by an embodiment of the present disclosure;

[0048] Figure 3 It is a flowchart of a carrier signal demodulation method provided by an embodiment of the present disclosure;

[0049] Figure 4 It is a flowchart of another carrier signal demodulation method provided by an embodiment of the present disclosure;

[0050] Figure 5 is a schematic diagram of obtaining a valid subcarrier signal provided by an embodiment of the present disclosure;

[0051] Figure 6It is a flowchart of another carrier signal demodulation method provided by an embodiment of the present disclosure;

[0052] Figure 7 It is a flowchart of another carrier signal demodulation method provided by an embodiment of the present disclosure;

[0053] Figure 8 is an application example diagram of a carrier signal demodulation method provided by an embodiment of the present disclosure;

[0054] Fig. 9 is a timing diagram of various signals during the execution of a carrier signal demodulation method provided by an embodiment of the present disclosure;

[0055] Fig.10 It is a structural diagram of a carrier signal demodulation device provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0056] In order to be able to understand the features and technical contents of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0057] The terms "first", "second", etc. in the specification and claims of the embodiments of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so that the embodiments of the embodiments of the present disclosure described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0058] Unless otherwise stated, the term "plurality" means two or more.

[0059] In the embodiment of the present disclosure, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B indicates: A or B.

[0060] The term "and / or" is a description of the association relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or, A and B.

[0061] The term "correspondence" may refer to an association relationship or a binding relationship. The correspondence between A and B means that there is an association relationship or a binding relationship between A and B.

[0062] The present disclosure provides a carrier signal demodulation system. Figure 1 As shown, the carrier signal demodulation system includes a signal receiver, an orthogonal demodulator, a carrier signal demodulation device and a signal demodulator. The signal receiver, the orthogonal demodulator, the carrier signal demodulation device and the signal demodulator are connected in sequence.

[0063] The signal receiver is a radio frequency (RF) signal receiver, and the signal receiver is configured to receive an original carrier signal and send the original carrier signal to an orthogonal demodulator.

[0064] The orthogonal demodulator is configured to demodulate the original carrier signal into two subcarrier signals and send the two subcarrier signals to the carrier signal demodulation device. In the process of demodulating the original carrier signal into two subcarrier signals, the orthogonal demodulator actually generates two mutually orthogonal baseband signals, which are called in-phase component (In-phase, I) and quadrature component (Quadrature, Q). These two subcarrier signals each carry different information of the original carrier signal, and there is a 90-degree phase difference between them, thereby achieving a comprehensive description of the original signal.

[0065] The carrier signal demodulation device is configured to obtain a combined carrier signal of two effective subcarrier signals, and send the combined carrier signal to a signal demodulator. The signal demodulator is configured to demodulate the combined carrier signal. Specifically, after receiving two subcarrier signals, the carrier signal demodulation device first determines the effective subcarrier signal of each channel. Then, an effective sampling phase control signal is generated for each effective subcarrier signal. Based on the effective subcarrier signal and its effective sampling phase control signal, the device calculates the signal-to-noise ratio of each channel. Subsequently, based on the comparison result of the signal-to-noise ratio of the two effective subcarrier signals with a preset threshold, the device selects an appropriate merging strategy and generates an optimal combined carrier signal based on the merging strategy. Finally, this combined carrier signal is sent to the signal demodulator for demodulation.

[0066] In some embodiments, the carrier signal demodulation system further includes a filter, and a filtered output signal of each subcarrier signal is obtained based on the filter. In the embodiments of the present disclosure, the filter can be a software filter or a hardware filter. When the filter is a software filter, the filter can be deployed in the carrier signal demodulation device; when the filter is a hardware filter, the filter can be combined with the hardware filter. Figure 2 As shown, the filter is connected to the orthogonal demodulator and the carrier signal demodulation device respectively. Based on the filter, a filtered output signal of each subcarrier signal can be obtained, and the carrier signal demodulation device determines the effective subcarrier signal of each subcarrier signal based on the filtered output signal of each subcarrier signal.

[0067] In some embodiments, in combination Figure 1 and Figure 2As shown, the carrier signal demodulation system also includes an antenna, and the signal receiver is connected to the antenna. The antenna can be a radio frequency antenna, and the signal receiver receives the original carrier signal through the antenna.

[0068] In combination with the carrier signal demodulation system provided by the embodiment of the present disclosure, the embodiment of the present disclosure provides a carrier signal demodulation method, the execution subject of the method is a carrier signal demodulation device (hereinafter referred to as the device), such as Figure 3 As shown, the carrier signal demodulation method includes:

[0069] S301, when receiving two subcarrier signals, the device determines a valid subcarrier signal of each subcarrier signal.

[0070] In the disclosed embodiment, the signal receiver is configured to receive the original carrier signal and send the original carrier signal to the orthogonal demodulator. The orthogonal demodulator demodulates the original carrier signal into two subcarrier signals, and sends the two subcarrier signals to the carrier signal demodulation device, which determines the effective subcarrier signal of each subcarrier signal. The two subcarrier signals are two mutually orthogonal baseband signals, respectively referred to as the in-phase component and the orthogonal component. The two subcarrier signals each carry different information of the original carrier signal, and there is a 90-degree phase difference between them, thereby achieving a comprehensive description of the original signal.

[0071] S302, the device determines a valid sampling phase control signal for each valid subcarrier signal.

[0072] In the disclosed embodiment, the effective sampling phase control signal is used to indicate the phase of the peak and trough of the effective subcarrier signal. The peak is the maximum value point of the signal amplitude, which usually corresponds to the "high" level state of the signal. Correctly identifying the peak phase helps to accurately capture the peak information of the signal. The trough is the minimum value point of the signal amplitude, which usually corresponds to the "low" level state of the signal. Based on the effective sampling phase control signal, the device can accurately collect the peak information of the effective subcarrier signal.

[0073] S303, the device calculates the signal-to-noise ratio of each effective subcarrier signal based on each effective subcarrier signal and its effective sampling phase control signal.

[0074] S304, the apparatus obtains a combined carrier signal of two effective subcarrier signals according to a combining mode indicated by a comparison result of the signal-to-noise ratios of the two effective subcarrier signals and a signal-to-noise ratio threshold.

[0075] S305, the device sends the combined carrier signal to the signal demodulator for demodulation.

[0076] The carrier signal demodulation method provided by the embodiment of the present disclosure, when receiving two subcarrier signals, first determines the valid subcarrier signal of each channel. This step enables the system to centrally process valid information and avoid unnecessary processing of invalid signal segments, thereby significantly reducing the waste of computing resources and improving processing efficiency. Next, an effective sampling phase control signal is generated for each valid subcarrier signal. These control signals accurately indicate the phases of the peaks and troughs of the valid subcarrier signals, ensuring that subsequent processing is based on the most accurate data, enhancing the adaptability and demodulation accuracy of the system. Subsequently, by accurately locating the peaks and troughs of the valid subcarrier signals, the system can accurately calculate the signal-to-noise ratio of each subcarrier signal. This process provides a reliable basis for further optimization processing. Finally, the optimal combining mode is selected based on the comparison result of the signal-to-noise ratio of the two valid subcarrier signals with the preset threshold. This intelligent combining strategy based on the signal-to-noise ratio ensures that the system always selects the path or combination with the best signal-to-noise ratio, maximizes the demodulation effect, and reduces the bit error rate. In summary, this method achieves more efficient and reliable carrier signal demodulation by identifying effective subcarriers in advance, dynamically generating sampling phase control signals, accurately calculating the signal-to-noise ratio, and intelligently selecting the combining mode, which significantly improves the overall performance and reduces the bit error rate.

[0077] In some embodiments, when two subcarrier signals are received, determining the effective subcarrier signal of each subcarrier signal includes: when two subcarrier signals are received, determining the noise threshold value of each subcarrier signal; and determining the part of the extreme value in each subcarrier signal whose absolute value is greater than the noise threshold value as the effective subcarrier signal of each subcarrier signal.

[0078] Combination Figure 4 As shown, the embodiment of the present disclosure provides another carrier signal demodulation method, the carrier signal demodulation method comprising:

[0079] S401, when receiving two subcarrier signals, the device determines a noise threshold value of each subcarrier signal.

[0080] In the disclosed embodiment, the noise threshold is used to determine which parts of the received signal are valid signals and which parts are noise or interference. Based on the noise threshold, the device can effectively filter out signal components below the noise threshold to avoid mistaking noise for valid information for processing, thereby improving demodulation accuracy and system performance.

[0081] In the disclosed embodiment, after receiving two subcarrier signals, the device obtains the previous sampling point data, divides it into multiple sub-sampling points, and determines the effective subcarrier signal and the noise threshold value based on the multiple sub-sampling points. Specifically, when receiving two subcarrier signals, the device obtains the previous sampling point data of the subcarrier signal for each subcarrier signal; divides the previous sampling point data of the subcarrier signal into multiple sub-sampling point data, calculates the maximum value in each sub-sampling point data; and determines the noise threshold value of the effective subcarrier signal of each subcarrier signal based on the maximum value in each sub-sampling point data of each subcarrier signal.

[0082] In the embodiment of the present disclosure, the average value of the maximum value of all sub-sampling point data of each wave signal is calculated, and the average value is used as the noise threshold value of the effective sub-carrier signal of each sub-carrier signal. Alternatively, the median of the maximum value of all sub-sampling point data of each wave signal is determined, and the median is used as the noise threshold value of the effective sub-carrier signal of each sub-carrier signal.

[0083] by Figure 5 For example, for each subcarrier signal, N sampling points are taken for the previous data of the subcarrier signal, and the N sampling points are converted into a sub-sampling point data, each of which has m sampling points. It can be understood that N = a × m. The maximum value in each sub-sampling point data is calculated to obtain a maximum value, which can be expressed as {max1, max2, ..., maxa}, where max1 is the maximum value in the first sub-sampling point data, max2 is the maximum value in the second sub-sampling point data, and so on, maxa is the maximum value in the ath sub-sampling point data. It can be understood that the maximum value in the sub-sampling point data is the largest sampling point in the sub-sampling point data. The average value of the a maximum values ​​is calculated, and this average value is used as the noise threshold value of the effective subcarrier signal of each subcarrier signal.

[0084] S402, the device determines the part of the extreme value of each subcarrier signal that is greater than the noise threshold value as the valid subcarrier signal of each subcarrier signal.

[0085] In the embodiment of the present disclosure, the extreme values ​​in the subcarrier signal are defined as the peak value and the trough value within a period. Figure 5 As shown in the figure, the system compares the absolute values ​​of the extreme values ​​from the front to the back in the subcarrier signal with the noise threshold value in sequence. When the absolute values ​​of K consecutive extreme values ​​are all greater than the noise threshold, the subsequent part is considered to be a valid subcarrier signal, and the front part is considered to be noise. In this way, the system can accurately distinguish between noise and valid signals, ensuring that subsequent processing is based on high-quality subcarrier signals, thereby improving demodulation accuracy and reliability.

[0086] In some embodiments, determining a portion of the extreme value in each subcarrier signal whose absolute value is greater than a noise threshold value as a valid subcarrier signal of each subcarrier signal includes: obtaining a filtered output signal of each subcarrier signal based on a filter; and determining a portion of the extreme value in the filtered output signal of each subcarrier signal whose absolute value is greater than a noise threshold value as a valid subcarrier signal of each subcarrier signal.

[0087] The filter can be a software filter or a hardware filter. When the filter is a software filter, the filter can be deployed in the carrier signal demodulation device; when the filter is a hardware filter, it can be combined with Figure 2 As shown, the filter is connected to the orthogonal demodulator and the carrier signal demodulation device respectively. Based on the filter, a filtered output signal of each subcarrier signal can be obtained, and the carrier signal demodulation device determines the effective subcarrier signal of each subcarrier signal based on the filtered output signal of each subcarrier signal.

[0088] S403, the device determines a valid sampling phase control signal for each valid subcarrier signal.

[0089] S404, the device calculates the signal-to-noise ratio of each effective subcarrier signal based on each effective subcarrier signal and its effective sampling phase control signal.

[0090] S405, the apparatus obtains a combined carrier signal of two effective subcarrier signals according to a combining mode indicated by a comparison result of the signal-to-noise ratios of the two effective subcarrier signals and a signal-to-noise ratio threshold.

[0091] S406, the device sends the combined carrier signal to the signal demodulator for demodulation.

[0092] In some embodiments, determining the effective sampling phase control signal for each effective subcarrier signal includes: for each effective subcarrier signal, detecting the zero-crossing point of the effective subcarrier signal; configuring the numerical cycle range of the sampling phase control signal and the numerical value of the sampling phase control signal at the first detected zero-crossing point according to the number of sampling points in each cycle of the effective subcarrier signal; detecting the number of matches between the numerical value of the sampling phase control signal at subsequent zero-crossing points of the effective subcarrier signal and the numerical value of the sampling phase control signal at the first detected zero-crossing point; and obtaining the effective sampling phase control signal that conforms to the effective subcarrier signal when the number of matches reaches a matching number threshold.

[0093] For each valid subcarrier signal, its zero crossing point is detected to determine the change in signal phase. This step ensures that the starting point of subsequent sampling is synchronized with the actual phase of the signal, improving the accuracy of symbol timing recovery. According to the number of sampling points in each cycle, the numerical cycle range of the sampling phase control signal is configured, and its initial value (for example, 0 or 4) is set when the zero crossing point is first detected. This configuration ensures the best selection of the sampling moment and reduces the error caused by phase deviation. The value of the sampling phase control signal at subsequent zero crossings is continuously detected, and the number of matches between these values ​​and the zero crossing value detected for the first time is counted. When the number of matches reaches the preset threshold, the system confirms that a valid sampling phase control signal that conforms to the valid subcarrier signal has been obtained. This method enhances the system's adaptive ability and can automatically adjust the sampling phase under different channel conditions to ensure the best demodulation effect. Through multiple matching verifications, the system can reduce misjudgments caused by noise or other interference and ensure the accuracy of the sampling phase control signal. This not only improves the stability of the system, but also reduces the bit error rate and enhances the overall demodulation performance.

[0094] Combination Figure 6 As shown, the embodiment of the present disclosure provides another carrier signal demodulation method, the carrier signal demodulation method comprising:

[0095] S601, when receiving two subcarrier signals, the device determines a valid subcarrier signal of each subcarrier signal.

[0096] S602: The device detects a zero-crossing point of each effective subcarrier signal.

[0097] In the embodiment of the present disclosure, the zero-crossing point refers to the position where the effective subcarrier signal passes through the zero level when crossing from a positive value to a negative value or from a negative value to a positive value.

[0098] S603, the apparatus configures the numerical cycle range of the sampling phase control signal and the numerical value of the sampling phase control signal at the first detected zero-crossing point according to the number of sampling points in each cycle of the effective subcarrier signal.

[0099] Assume that one cycle of each valid subcarrier signal contains 8 sampling points. The system first detects the zero crossing point of the valid subcarrier signal, and initially configures the value of the sampling phase control signal to 0 or 4 depending on whether the zero crossing point is at the rising edge or the falling edge. Subsequently, the value of the sampling phase control signal counts cyclically between 0 and 7 to track the position of the sampling point in each cycle. Specifically, if the zero crossing point is detected to be a rising edge, the value of the sampling phase control signal is initially configured to 0, and the sampling point sequence is: 0, 1, 2, 3, 4, 5, 6, 7. If the zero crossing point is detected to be a falling edge, the value of the sampling phase control signal is initially configured to 4, and the sampling point sequence is: 4, 5, 6, 7, 0, 1, 2, 3.

[0100] S604, the device detects the number of matches between the value of the sampling phase control signal at the subsequent zero-crossing point of the effective subcarrier signal and the value of the sampling phase control signal at the first detected zero-crossing point.

[0101] After the value of the sampling phase control signal is initially configured, the value of the sampling phase control signal at the subsequent zero-crossing point of the effective subcarrier signal is detected, and the matching of the value of the sampling phase control signal at the zero-crossing point detected for the first time is to detect whether the value of the sampling phase control signal at the subsequent zero-crossing point of the effective subcarrier signal meets expectations, that is, 0 corresponds to the rising edge zero-crossing point, and 4 corresponds to the falling edge zero-crossing point. If the value of the sampling phase control signal at the subsequent zero-crossing point of the effective subcarrier signal meets 0 corresponding to the rising edge zero-crossing point or 4 corresponding to the falling edge zero-crossing point, a match is recorded and the total number of matches is counted.

[0102] S605, when the number of matches reaches a threshold number of matches, the device obtains a valid sampling phase control signal that matches a valid subcarrier signal.

[0103] In the disclosed embodiment, the effective sampling phase control signal is used to indicate the phase of the peak and trough of the effective subcarrier signal. The peak is the maximum value point of the signal amplitude, which usually corresponds to the "high" level state of the signal. Correctly identifying the peak phase helps to accurately capture the peak information of the signal. The trough is the minimum value point of the signal amplitude, which usually corresponds to the "low" level state of the signal. Based on the effective sampling phase control signal, the device can accurately collect the peak information of the effective subcarrier signal.

[0104] In the embodiment of the present disclosure, the process of acquiring the effective sampling phase control signal for two effective subcarrier signals is carried out simultaneously. When the effective sampling phase control signal of one effective subcarrier signal is obtained, the process of acquiring the effective sampling phase control signal of the other effective subcarrier signal can be terminated in advance, and the obtained effective sampling phase control signal is used as the common effective sampling phase control signal of the two effective subcarrier signals.

[0105] S606: The device calculates the signal-to-noise ratio of each effective subcarrier signal based on each effective subcarrier signal and its effective sampling phase control signal.

[0106] S607, the apparatus obtains a combined carrier signal of the two effective subcarrier signals according to a combining mode indicated by a comparison result of the signal-to-noise ratios of the two effective subcarrier signals and a signal-to-noise ratio threshold.

[0107] S608, the device sends the combined carrier signal to the signal demodulator for demodulation.

[0108] In an embodiment of the present disclosure, based on each effective subcarrier signal and its effective sampling phase control signal, the signal-to-noise ratio of each effective subcarrier signal is calculated, including: for each effective subcarrier signal, based on the effective subcarrier signal and its effective sampling phase control signal, obtaining a specified number of extreme values ​​of the effective subcarrier signal, wherein the extreme value of the effective subcarrier signal is a peak value and a trough value within a period; calculating the average value of the absolute values ​​of the specified number of extreme values ​​of the effective subcarrier signal; and calculating the signal-to-noise ratio of the effective subcarrier signal based on a noise threshold value of the effective subcarrier signal and the average value of the absolute values ​​of the specified number of extreme values.

[0109] Combination Figure 7 As shown, the embodiment of the present disclosure provides another carrier signal demodulation method, the carrier signal demodulation method comprising:

[0110] S701, when receiving two subcarrier signals, the device determines a valid subcarrier signal of each subcarrier signal.

[0111] S702, the device determines a valid sampling phase control signal for each valid subcarrier signal.

[0112] S703, the apparatus obtains, for each effective subcarrier signal, a specified number of extreme values ​​of the effective subcarrier signal based on the effective subcarrier signal and its effective sampling phase control signal.

[0113] In the disclosed embodiment, the extreme value in the subcarrier signal is defined as the peak value and the trough value within one cycle. As described above, assuming that one cycle of each valid subcarrier signal contains 8 sampling points, when the value of the valid sampling phase control signal is 2 or 6, the extreme value of the valid subcarrier signal can be obtained by sampling the subcarrier signal. The value of the specified number can be determined according to the actual design requirements. When the extreme value of the acquired valid subcarrier signal reaches the specified number, the acquisition of the extreme value of the valid subcarrier signal can be terminated.

[0114] S704, the apparatus calculates an average of the absolute values ​​of a specified number of extreme values ​​of the effective subcarrier signal.

[0115] S705: The apparatus calculates a signal-to-noise ratio of the effective subcarrier signal based on the noise threshold value of the effective subcarrier signal and an average value of the absolute values ​​of a specified number of extreme values.

[0116] In the embodiment of the present disclosure, the average value of the absolute values ​​of the specified number of extreme values ​​of the effective subcarrier signal can be used as an estimate of the signal power, and the noise threshold value of the effective subcarrier signal can be used as an estimate of the noise power. Here, the ratio of the average value of the absolute values ​​of the specified number of extreme values ​​of the effective subcarrier signal to the noise threshold value of the effective subcarrier signal is calculated, and the signal-to-noise ratio of the effective subcarrier signal is calculated based on the ratio.

[0117] S706, the apparatus obtains a combined carrier signal of the two effective subcarrier signals according to a combining mode indicated by a comparison result of the signal-to-noise ratios of the two effective subcarrier signals and a signal-to-noise ratio threshold.

[0118] S707, the device sends the combined carrier signal to the signal demodulator for demodulation.

[0119] In the disclosed embodiment, a signal-to-noise ratio threshold may be preset, and the device compares the signal-to-noise ratio of two effective subcarrier signals with the signal-to-noise ratio threshold, and determines the combining mode of the two effective subcarrier signals according to the comparison result.

[0120] In an embodiment of the present disclosure, obtaining a combined carrier signal of two effective subcarrier signals according to a combining mode indicated by a comparison result of the signal-to-noise ratios of the two effective subcarrier signals with a signal-to-noise ratio threshold includes: when the signal-to-noise ratios of the two effective subcarrier signals are both greater than the signal-to-noise ratio threshold, using the effective subcarrier signal with the largest signal-to-noise ratio as the combined carrier signal of the two effective subcarrier signals.

[0121] When the signal-to-noise ratio of the two effective subcarrier signals is greater than the signal-to-noise ratio threshold, the effective subcarrier signal with the largest signal-to-noise ratio is selected as the combined carrier signal. By selecting the signal path with the highest signal-to-noise ratio, the strongest signal strength and the lowest noise interference are ensured, thereby improving the accuracy of demodulation. In addition, when the signal-to-noise ratio is good, the optimal path is directly selected, which reduces unnecessary complex processing steps and improves the processing efficiency of the system.

[0122] In an embodiment of the present disclosure, obtaining a combined carrier signal of two effective subcarrier signals according to a combining mode indicated by a comparison result of the signal-to-noise ratios of the two effective subcarrier signals with a signal-to-noise ratio threshold includes: calculating the number of extreme value pairs with the same polarity at the same position of the two effective subcarrier signals when the signal-to-noise ratio of at least one effective subcarrier signal is not greater than the signal-to-noise ratio threshold; and obtaining the combined carrier signal of the two effective subcarrier signals according to a combining mode indicated by a comparison result of the number of extreme value pairs with the same polarity with a specified number.

[0123] When the signal-to-noise ratio of at least one valid subcarrier signal is not greater than the signal-to-noise ratio threshold, if the number of extreme value pairs with the same polarity is not greater than the first ratio of the specified number, differential processing (dividing the difference between the two signals by two) is used to reduce the impact of phase differences and avoid signal cancellation. If the number of extreme value pairs with the same polarity is not less than the second ratio of the specified number, sum processing (dividing the sum of the two signals by two) is used to enhance signal strength and improve demodulation performance. If the number of extreme value pairs with the same polarity is between the first and second ratios, the signal path with the largest signal-to-noise ratio is selected to ensure that better quality signals are used in uncertain situations. By dynamically adjusting the combining mode, the system can automatically optimize the processing strategy under different channel conditions, enhancing adaptability and anti-interference capabilities. By accurately selecting the combining mode, bit errors caused by poor signal quality are reduced and the reliability of overall demodulation is improved.

[0124] As shown above, in the process of calculating the signal-to-noise ratio of the effective subcarrier signal, a specified number of extreme values ​​of each effective subcarrier signal has been obtained in advance. If the extreme values ​​of two effective subcarrier signals at the same position are both positive or negative, it is considered that the pair of extreme values ​​have the same polarity. At this time, the number of extreme value pairs with the same polarity of the two effective subcarrier signals at the same position can be increased by 1. The number of extreme value pairs with the same polarity of the two effective subcarrier signals at the same position is calculated by comparing the polarity of the extreme values ​​described above.

[0125] In the embodiment of the present disclosure, different ratios can be set for the specified number, the number of extreme value pairs with the same polarity can be compared with the different ratios of the specified number, the combining mode can be determined based on the comparison result, and then the combined carrier signal of the two effective subcarrier signals can be obtained according to the combining mode.

[0126] In some embodiments, a first ratio and a second ratio may be specified for a specified number, wherein the second ratio is greater than the first ratio. The values ​​of the first ratio and the second ratio may be determined according to actual design requirements, for example, the first ratio is one third and the second ratio is two thirds. When the number of extreme value pairs with the same polarity is not greater than the first ratio of the specified number, the result of dividing the difference between the two effective subcarrier signals by two is used as the combined carrier signal of the two effective subcarrier signals. When the number of extreme value pairs with the same polarity is not less than the second ratio of the specified number, the result of dividing the sum of the two effective subcarrier signals by two is used as the combined carrier signal of the two effective subcarrier signals. When the number of extreme value pairs with the same polarity is greater than the first ratio of the specified number and less than the second ratio of the specified number, the effective subcarrier signal with the largest signal-to-noise ratio is used as the combined carrier signal of the two effective subcarrier signals.

[0127] Combine the following Figure 8 and Fig. 9 The specific process of the carrier signal demodulation method is introduced. Figure 8 This is an application example diagram of the carrier signal demodulation method. Fig. 9 is a timing diagram of each signal during the execution of the carrier signal demodulation method, and the two subcarrier signals are the I subcarrier signal and the Q subcarrier signal. Fig. 9 In the above, ruler represents the effective sampling phase control signal, ruler_rdy represents the ready state of ruler, IQ_adapt_vld indicates whether the current sampling point is valid, I-channel buffer is used to store the extreme values ​​of the effective subcarrier signal of I-channel, Q-channel buffer is used to store the extreme values ​​of the effective subcarrier signal of Q-channel, and cnt represents the number of extreme value pairs with the same polarity at the same position of the I-channel subcarrier signal and the Q-channel subcarrier signal. Sampling phase 0 and sampling phase 1 are two adjacent sampling phases.

[0128] First, input the I-channel subcarrier signal and the Q-channel subcarrier signal into the filter, and the filter outputs the filtered output signal of each subcarrier signal. The part of the filtered output signal of each subcarrier signal whose absolute value is greater than the noise threshold value is determined as the effective subcarrier signal of each subcarrier signal. The effective subcarrier signal dcorr_i of the I-channel subcarrier signal and the effective subcarrier signal dcorr_q of the Q-channel subcarrier signal. Then, the effective sampling phase control signal ruler_i of the effective subcarrier signal dcorr_i is obtained, and the effective sampling phase control signal ruler_q of the effective subcarrier signal dcorr_q is obtained.

[0129] Assuming that one cycle of each effective subcarrier signal contains 8 sampling points, when the effective sampling phase control signal takes the value of 2 or 6, the subcarrier signal can be sampled to obtain the extreme value of the effective subcarrier signal. Here, based on the effective subcarrier signal dcorr_i and its effective sampling phase control signal ruler_i, p extreme values ​​of the effective subcarrier signal dcorr_i are obtained, and these p extreme values ​​can be expressed as {a1, a2, ..., ap}, and the p extreme values ​​of the effective subcarrier signal dcorr_i are stored in the I-way buffer in sequence. Based on the effective subcarrier signal dcorr_q and its effective sampling phase control signal ruler_q, p extreme values ​​of the effective subcarrier signal dcorr_q are obtained, and these p extreme values ​​can be expressed as {b1, b2, ..., bp}, and the p extreme values ​​of the effective subcarrier signal dcorr_q are stored in the Q-way buffer in sequence.

[0130] The ratio of the average value of the absolute values ​​of the p extreme values ​​of the effective subcarrier signal dcorr_i to the noise threshold value of the effective subcarrier signal dcorr_i is calculated, and the signal-to-noise ratio of the effective subcarrier signal dcorr_i is calculated based on the ratio. The ratio of the average value of the absolute values ​​of the p extreme values ​​of the effective subcarrier signal dcorr_q to the noise threshold value of the effective subcarrier signal dcorr_q is calculated, and the signal-to-noise ratio of the effective subcarrier signal dcorr_q is calculated based on the ratio.

[0131] In the embodiment of the present disclosure, a signal-to-noise ratio threshold may be pre-set, and the device compares the signal-to-noise ratio of the I-channel subcarrier signal and the Q-channel subcarrier signal with the signal-to-noise ratio threshold, and determines the combining mode of the two effective subcarrier signals according to the comparison result.

[0132] When the signal-to-noise ratios of the I-channel subcarrier signal and the Q-channel subcarrier signal are both greater than the signal-to-noise ratio threshold, the valid subcarrier signal with the largest signal-to-noise ratio is used as the combined carrier signal of the two valid subcarrier signals. For example, if the signal-to-noise ratio of the I-channel subcarrier signal is greater than the signal-to-noise ratio of the Q-channel subcarrier signal, the I-channel subcarrier signal is used as the combined carrier signal of the two valid subcarrier signals.

[0133] When the signal-to-noise ratio of the I subcarrier signal and / or the Q subcarrier signal is not greater than the signal-to-noise ratio threshold, the number cnt of extreme value pairs of the I subcarrier signal and the Q subcarrier signal with the same polarity at the same position is calculated.

[0134] When the number of extreme value pairs with the same polarity cnt is not greater than q / 3, the result of dividing the difference between the I-channel subcarrier signal and the Q-channel subcarrier signal by two is used as the combined carrier signal. This combining mode is expressed as: when cnt≤q / 3, the combined carrier signal is (IQ) / 2. Among them, I represents the I-channel subcarrier signal, and Q represents the Q-channel subcarrier signal.

[0135] When the number of extreme value pairs with the same polarity cnt is not less than (2 / 3)*q, the sum of the I-channel subcarrier signal and the Q-channel subcarrier signal is divided by two, and the result is used as the combined carrier signal. This combining mode is expressed as: when cnt≥(2 / 3)*q, the combined carrier signal is (I+Q) / 2. Among them, I represents the I-channel subcarrier signal, and Q represents the Q-channel subcarrier signal.

[0136] When the number of extreme value pairs with the same polarity cnt is less than (2 / 3)*q and greater than q / 3, the effective subcarrier signal with the largest signal-to-noise ratio is used as the combined carrier signal of the two effective subcarrier signals. For example, if the signal-to-noise ratio of the I-channel subcarrier signal is greater than the signal-to-noise ratio of the Q-channel subcarrier signal, the I-channel subcarrier signal is used as the combined carrier signal of the two effective subcarrier signals.

[0137] Combination Fig.10As shown, an embodiment of the present disclosure provides a carrier signal demodulation device 1000, which includes a processor (processor) 1001 and a memory (memory) 1002. Optionally, the carrier signal demodulation device 1000 may also include a communication interface (Communication Interface) 1003 and a bus 1004. Among them, the processor 1001, the communication interface 1003, and the memory 1002 can communicate with each other through the bus 1004. The communication interface 1003 can be used for information transmission. The processor 1001 can call the logic instructions in the memory 1002 to execute the carrier signal demodulation method of the above embodiment.

[0138] In addition, the logic instructions in the memory 1002 described above may be implemented in the form of software functional units and when sold or used as independent products, may be stored in a computer-readable storage medium.

[0139] The memory 1002 is a computer-readable storage medium that can be used to store software programs and computer executable programs, such as program instructions / modules corresponding to the method in the embodiment of the present disclosure. The processor 1001 executes the function application and data processing by running the program instructions / modules stored in the memory 1002, that is, the carrier signal demodulation method in the above embodiment is implemented.

[0140] The memory 1002 may include a program storage area and a data storage area, wherein the program storage area may store an operating system and an application required for at least one function; the data storage area may store data created according to the use of the terminal device, etc. In addition, the memory 1002 may include a high-speed random access memory and may also include a non-volatile memory.

[0141] An embodiment of the present disclosure provides a computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are configured to execute the above-mentioned carrier signal demodulation method.

[0142] The technical solution of the embodiment of the present disclosure can be embodied in the form of a software product, which is stored in a storage medium and includes one or more instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in the embodiment of the present disclosure. The aforementioned storage medium may be a non-transient storage medium, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a disk or an optical disk, and other media that can store program codes.

[0143] The above description and the accompanying drawings fully illustrate the embodiments of the present disclosure so that those skilled in the art can practice them. Other embodiments may include structural, logical, electrical, process and other changes. The embodiments represent only possible changes. Unless explicitly required, separate components and functions are optional, and the order of operation may vary. The parts and features of some embodiments may be included in or replace the parts and features of other embodiments. Moreover, the words used in this application are only used to describe the embodiments and are not used to limit the claims. As used in the description of the embodiments and the claims, unless the context clearly indicates, the singular forms of "a", "an" and "the" are intended to include plural forms as well. Similarly, the term "and / or" as used in this application refers to any and all possible combinations of listings containing one or more associated ones. In addition, when used in the present application, the term "comprise" and its variants "comprises" and / or comprising refer to the presence of stated features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or groups thereof. In the absence of further restrictions, the elements defined by the sentence "comprising a ..." do not exclude the presence of other identical elements in the process, method or device comprising the elements. In this article, each embodiment may focus on the differences from other embodiments, and the same and similar parts between the various embodiments may refer to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method part disclosed in the embodiments, then the relevant parts can refer to the description of the method part.

[0144] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software may depend on the specific application and design constraints of the technical solution. The technicians may use different methods for each specific application to implement the described functions, but such implementations should not be considered to exceed the scope of the embodiments of the present disclosure. The technicians may clearly understand that, for the convenience and simplicity of description, the specific working processes of the systems, devices and units described above may refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here.

[0145] In the embodiments disclosed herein, the disclosed methods and products (including but not limited to devices, equipment, etc.) can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units can be only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between each other shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms. The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to implement this embodiment. In addition, each functional unit in the embodiment of the present disclosure may be integrated in a processing unit, or each unit may exist physically alone, or two or more units may be integrated in one unit.

[0146] The flowchart and block diagram in the accompanying drawings show the possible architecture, function and operation of the system, method and computer program product according to the embodiment of the present disclosure. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of the code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. In some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, which can depend on the functions involved. In the description corresponding to the flowchart and the block diagram in the accompanying drawings, the operations or steps corresponding to different boxes can also occur in a different order from the order disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, which can depend on the functions involved. Each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, may be implemented by a dedicated hardware-based system that performs the specified functions or actions, or may be implemented by a combination of dedicated hardware and computer instructions.

Claims

1. A carrier signal demodulation method, characterized in that: include: When two subcarrier signals are received, determining a valid subcarrier signal of each subcarrier signal; Determine an effective sampling phase control signal for each effective subcarrier signal, wherein the effective sampling phase control signal is used to indicate the phase of the peak and the trough of the effective subcarrier signal; Calculate the signal-to-noise ratio of each effective subcarrier signal based on each effective subcarrier signal and its effective sampling phase control signal; According to the combining mode indicated by the comparison result of the signal-to-noise ratio of the two effective subcarrier signals and the signal-to-noise ratio threshold, a combined carrier signal of the two effective subcarrier signals is obtained, and the combined carrier signal is sent to the signal demodulator for demodulation.

2. The carrier signal demodulation method according to claim 1, characterized in that: When two subcarrier signals are received, determining a valid subcarrier signal of each subcarrier signal includes: When receiving two subcarrier signals, determining a noise threshold value of each subcarrier signal; The part of the extreme value in each subcarrier signal whose absolute value is greater than the noise threshold value is determined as the effective subcarrier signal of each subcarrier signal.

3. The carrier signal demodulation method according to claim 2, characterized in that: When two subcarrier signals are received, a noise threshold value of each subcarrier signal is determined, including: When two subcarrier signals are received, for each subcarrier signal, the previous sampling point data of the subcarrier signal is obtained; Divide the previous sampling point data of the subcarrier signal into multiple sub-sampling point data segments, and calculate the maximum value of each sub-sampling point data segment; Based on the maximum value of each segment of sub-sampling point data of each channel of sub-carrier signal, the noise threshold value of the effective sub-carrier signal of each channel of sub-carrier signal is determined.

4. The carrier signal demodulation method according to claim 2, characterized in that: The part of the extreme value of each subcarrier signal whose absolute value is greater than the noise threshold value is determined as the effective subcarrier signal of each subcarrier signal, including: Obtaining a filtered output signal of each subcarrier signal based on the filter; The part of the filtered output signal of each subcarrier signal whose absolute value is greater than the noise threshold value is determined as the effective subcarrier signal of each subcarrier signal.

5. The carrier signal demodulation method according to any one of claims 1 to 4, characterized in that: Determine the effective sampling phase control signal of each effective subcarrier signal, including: For each effective subcarrier signal, detecting the zero crossing point of the effective subcarrier signal; According to the number of sampling points in each cycle of the effective subcarrier signal, the numerical cycle range of the sampling phase control signal and the numerical value of the sampling phase control signal at the zero crossing point detected for the first time are configured; Detecting the number of matches between the value of the sampling phase control signal at subsequent zero crossings of the effective subcarrier signal and the value of the sampling phase control signal at the first detected zero crossing; When the number of matches reaches a matching number threshold, a valid sampling phase control signal that conforms to a valid subcarrier signal is obtained.

6. The carrier signal demodulation method according to any one of claims 1 to 4, characterized in that: Based on each effective subcarrier signal and its effective sampling phase control signal, the signal-to-noise ratio of each effective subcarrier signal is calculated, including: For each effective subcarrier signal, based on the effective subcarrier signal and its effective sampling phase control signal, a specified number of extreme values ​​of the effective subcarrier signal are obtained, wherein the extreme values ​​of the effective subcarrier signal are peak values ​​and trough values ​​within one period; Calculating an average of the absolute values ​​of a specified number of extreme values ​​of the effective subcarrier signal; The signal-to-noise ratio of the effective subcarrier signal is calculated based on the noise threshold value of the effective subcarrier signal and the average value of the absolute values ​​of a specified number of extreme values.

7. The carrier signal demodulation method according to claim 6, characterized in that: Acquiring a combined carrier signal of the two effective subcarrier signals according to a combining mode indicated by a comparison result of the signal-to-noise ratios of the two effective subcarrier signals and a signal-to-noise ratio threshold includes: when the signal-to-noise ratios of the two effective subcarrier signals are both greater than the signal-to-noise ratio threshold, taking the effective subcarrier signal with the largest signal-to-noise ratio as the combined carrier signal of the two effective subcarrier signals.

8. The carrier signal demodulation method according to claim 6, characterized in that: Acquiring a combined carrier signal of the two effective subcarrier signals according to a combining mode indicated by a comparison result of the signal-to-noise ratio of the two effective subcarrier signals with a signal-to-noise ratio threshold, including: When the signal-to-noise ratio of at least one valid subcarrier signal is not greater than the signal-to-noise ratio threshold, the number of extreme value pairs of two valid subcarrier signals with the same polarity at the same position is calculated; A combined carrier signal of two effective subcarrier signals is obtained according to a combining mode indicated by a comparison result of the number of extreme value pairs with the same polarity and a specified number.

9. A carrier signal demodulation device, comprising a processor and a memory storing program instructions, characterized in that: The processor is configured to execute the carrier signal demodulation method according to any one of claims 1 to 8 when running the program instructions.

10. A carrier signal demodulation system, characterized in that: It includes a signal receiver, an orthogonal demodulator, a carrier signal demodulation device and a signal demodulator; The signal receiver is configured to receive the original carrier signal and send the original carrier signal to the orthogonal demodulator; The orthogonal demodulator is configured to demodulate the original carrier signal into two sub-carrier signals and send the two sub-carrier signals to the carrier signal demodulation device; The carrier signal demodulation device is configured to perform the carrier signal demodulation method according to any one of claims 1 to 8; The signal demodulator is configured to demodulate the combined carrier signal.

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