WO2013037217A1

WO2013037217A1 - Method and apparatus for acquiring standing wave ratio

Info

Publication number: WO2013037217A1
Application number: PCT/CN2012/076044
Authority: WO
Inventors: 李凡龙
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-09-13
Filing date: 2012-05-25
Publication date: 2013-03-21
Also published as: CN102291192B; CN102291192A

Abstract

Disclosed are a method and apparatus for acquiring a standing wave ratio. The method comprises: acquiring vector expressions of physical attribute values of an incident signal and a reflected signal respectively; abstracting a standing wave ratio detection apparatus into a vector model, parameter values of a physical expression corresponding to the vector model comprising the physical attribute value of the incident signal and the physical attribute value of the reflected signal which are expressed by using vectors, a value of an expression corresponding to the vector model being a reflection coefficient, and the reflection coefficient is a vector value; and acquiring a standing wave ratio according to the reflection coefficient. The present invention improves the precision of standing wave ratio detection.

Description

TECHNICAL FIELD The present invention relates to the field of communications, and in particular to a method and apparatus for acquiring a standing wave ratio. BACKGROUND OF THE INVENTION In communication technology, the standing wave ratio is used to measure impedance matching in a signal transmission link. The standing wave ratio is defined by the magnitude of the reflection coefficient. The details are as follows: Assuming that the forward wave (also called the transmitted wave) is ^, the reflected wave, the coefficient of the reflection is defined as:

It should be noted that Γ is a complex vector that describes the amplitude and phase of the reflection. According to the definition of standing wave ratio:

χ -ρ ), where , is the magnitude of the reflection coefficient. According to the definition of the above standing wave ratio, the standing wave ratio is a value greater than 1, and the larger the standing wave ratio, the larger the reflected signal is, and the worse the matching of the signal transmission is. The traditional method of standing wave ratio detection is to calculate the return loss by obtaining the reflected power and the incident power of the signal, and finally calculate the standing wave ratio. This method is called scalar detection. The method is based on the definition of the standing wave ratio. If it is necessary to know the standing wave ratio, the amplitude of the reflection coefficient needs to be obtained, and the conversion is expressed in the form of power, and the return wave loss is further derived by using the return loss. That is, using the conversion relationship between amplitude and power, the expression of the standing wave ratio is re-introduced, which is briefly explained below:

According to the definition, if expressed by power, it can be expressed as:

RL = \0Log^- Return Loss (RL for short) is defined as: ... (4); Combining the above formulas (3) and (4), we can obtain: ( 5 ); Therefore, the scalar detection method of the standing wave ratio calculates the return loss by acquiring the reflected power and the incident power of the signal. Finally, the standing wave ratio is calculated. This method is widely applied to communication systems. However, if you want to ensure the rationality of the above-mentioned standing wave ratio scalar detection method and the accuracy of the obtained standing wave ratio, you need to make the following conditions for the system and its measurement:

(1) The acquisition points of the incident signal and the reflected signal must all come from the point where the matching condition expressed by the standing wave ratio is desired. That is, when it is necessary to detect the standing wave ratio indicating that the point A is matched, the detection point is placed at point B different from the point A.

(2) The detection path through which the incident and reflected signal power is detected must have exactly the same gain characteristics, which are generally measured in terms of amplitude and phase.

(3) Both the incident signal and the reflected signal must be undisturbed by any other signal in the detection link during the detection process. Only when all the above three constraints are satisfied at the same time, the standing wave ratio detected by the standing wave ratio scalar detection method can be correct, and high precision can be obtained. However, it is difficult to ensure that the above three points are completely satisfied in the actual detection system (detection device). For example, the detection of the standing wave ratio in the Radio Remote Uint (RRU) in the wireless communication system, FIG. 1 is a schematic diagram of the standing wave ratio detection in the RRU in the wireless communication according to the related art, below The detection of the standing wave ratio will be described with reference to FIG. As shown in FIG. 1, the signal 1 is a transmission signal (Forward, referred to as FWD, also becomes an incident signal), and the signal 5 is a reflection signal (Reverse, abbreviated as REV). First, in the detection of the standing wave ratio, the point at which the standing wave ratio reaction is desired is the RRU and the antenna system ANT. However, after the detection point of the incident signal is placed after the component power amplifier, the power detection point of the reflected signal is placed before the component filter, so the first rule of the above limitation condition cannot be satisfied; secondly, FWD and REV are selected in 2 Before the switch passes a completely different path, it can not meet the second condition of the above limitation; Third, the detection of REV is also affected by the crosstalk signal 2 of the transmitted signal FWD, the internal signal of the system 3, the reflected interference signal of the Filter 4 Interference, therefore, cannot satisfy the third clause of the above restrictions. Based on the above analysis, the existing scalar detection method results in low accuracy of standing wave ratio detection. In practical applications, it is difficult to obtain a detection value of a higher precision standing wave ratio. SUMMARY OF THE INVENTION The present invention provides a method and apparatus for acquiring a standing wave ratio, which at least solves the problem of low accuracy and inaccuracy of standing wave ratio detection of the above-described conventional scalar standing wave ratio detecting method. According to an aspect of the present invention, a method for acquiring a standing wave ratio is provided, the method comprising: respectively acquiring a vector representation of physical property values of an incident signal and a reflected signal; and abstracting the standing wave ratio detecting device into a vector model, The parameter value of the physical expression corresponding to the vector model includes a physical attribute value of the incident signal represented by a vector and a physical attribute value of the reflected signal, and the value of the expression corresponding to the vector model is a reflection coefficient, wherein The reflection coefficient is a vector value; and the standing wave ratio is obtained according to the reflection coefficient. Preferably, obtaining a vector representation of the physical property values of the incident signal and the reflected signal respectively comprises: obtaining a vector representation of the physical property values of the incident signal and the reflected signal by measurement, respectively. Preferably, respectively obtaining a vector representation of the physical property values of the incident signal and the reflected signal comprises: respectively obtaining two different types of scalar values of the incident signal and the reflected signal by measurement, according to the different types of scalar values Obtaining a vector representation of physical property values of the incident signal and the reflected signal. Preferably, the two different types of scalar values are power values and phase values. Preferably, obtaining the constant value in the vector model comprises: acquiring a vector value of the physical property value of the fixed incident signal and the reflected signal respectively corresponding to the plurality of sets of known fixed loads obtained by using the standing wave ratio detecting device; For example, the standing wave ratio detecting means respectively corresponds to a vector value of a physical value of a fixed incident signal and a reflected signal in the case of an open circuit, a short circuit and a perfect match; and according to the reflection coefficient and the incident signal and the reflection The vector value of the physical property value of the signal results in a constant value in the vector model. Preferably, obtaining the constant value in the vector model comprises: obtaining an amplitude of the reflection coefficient according to the measured power value of the incident signal and the reflected signal, and the incident signal and the reflected signal according to the measurement The phase value obtains a phase value of the reflection coefficient; and a constant value in the vector model is obtained according to a vector value of the plurality of sets of the reflection coefficient and a vector value of the incident signal and a physical property value of the reflected signal. According to another aspect of the present invention, a standing wave ratio obtaining apparatus is further provided, the apparatus comprising: a first acquiring module configured to respectively acquire a vector representation of physical property values of an incident signal and a reflected signal; an abstract module, setting In order to abstract the standing wave ratio detecting device into a vector model, the parameter values of the physical expression corresponding to the vector model include a physical attribute value of the incident signal represented by a vector and a physical attribute value of the reflected signal, The value of the expression corresponding to the vector model is a reflection coefficient, wherein the reflection coefficient is a vector value; and the second acquisition module is configured to acquire the standing wave ratio according to the reflection coefficient. Preferably, the first acquiring module is configured to acquire the vector representation by at least one of: obtaining a vector representation of physical property values of the incident signal and the reflected signal by measurement; respectively, obtaining the incident by measurement Two different types of scalar values of the signal and the reflected signal, a vector representation of the physical property values of the incident signal and the reflected signal is obtained from the different types of scalar values. Preferably, the two different types of scalar values are power values and phase values. Preferably, the abstraction module is configured to acquire a constant value in the vector model according to at least one of the following: obtaining the transmission parameter respectively corresponding to a fixed set of fixed fixed loads obtained by using the standing wave ratio detecting device a vector value of a physical property value of the signal and the reflected signal, for example, the standing wave ratio detecting means respectively corresponds to a vector value of a physical value of the fixed incident signal and the reflected signal in the case of an open circuit, a short circuit, and a perfect match; a reflection coefficient and a vector value of a physical property value of the incident signal and the reflected signal to obtain a constant value in the vector model; acquiring the power value according to the measured incident signal and the reflected signal a magnitude of the reflection coefficient, the phase value of the reflection coefficient is obtained according to the measured phase value of the incident signal and the reflected signal; and the vector value of the plurality of sets of the reflection coefficient and the incident signal and the reflected signal The vector value of the physical property value yields a constant value in the vector model. According to the present invention, the vector detection method is adopted, and the standing wave ratio detecting device is abstracted into a vector model without using the condition limitation, and the reflection coefficient is obtained by using the expression corresponding to the vector model, and the standing wave is obtained. Therefore, the conditional limitation of the standing wave ratio scalar detection method to the standing wave ratio detection system is eliminated, and the problem of low standing wave ratio detection accuracy of the existing scalar standing wave ratio detection method is solved, and the problem of inaccuracy is effectively improved, and the station is effectively improved. The detection accuracy of the wave ratio. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, In the drawings: FIG. 1 is a schematic diagram of standing wave ratio detection in an RRU in wireless communication according to the related art; FIG. 2 is a flowchart of a standing wave ratio acquisition method according to an embodiment of the present invention; FIG. A block diagram of a configuration of a standing wave ratio acquisition device; 4 is a schematic diagram of a standing wave ratio detecting device in a wireless system according to the related art; FIG. 5 is a schematic diagram of an abstract vector model of a standing wave ratio detecting device in a wireless system according to a limited embodiment of the present invention; FIG. 6 is a preferred embodiment according to the present invention. FIG. 7 is a flowchart of a method for acquiring a loop delay according to a preferred embodiment of the present invention; FIG. 8 is a reflection coefficient ¹ ^ according to a preferred embodiment of the present invention; FIG. 9 is a flowchart of a method for acquiring the amplitude of a channel independent reflection coefficient according to a preferred embodiment of the present invention; and FIG. 10 is a reflection coefficient of channel multiplexing according to a preferred embodiment of the present invention. A flow chart of the method of obtaining the magnitude of ^. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. In the prior art, for systems requiring VSWR detection (for example, wireless communication systems), the standing wave ratio scalar detection method is used to detect the standing wave ratio, but the use of the standing wave ratio scalar detection method is used. At least three assumptions are required to be used, but in the actual application environment, it is difficult to satisfy the three assumptions at the same time, and thus the obtained standing wave ratio is low in accuracy and inaccurate. In this embodiment, a VSWR acquisition method is provided, which is suitable for various fields of VSWR detection (for example, wireless field), and FIG. 2 is a flowchart of a VSWR acquisition method according to an embodiment of the present invention. As shown in FIG. 2, the method includes the following steps: Step S202: Acquire a vector representation of physical property values of an incident signal and a reflected signal, respectively. Step S204, abstracting the standing wave ratio detecting device into a vector model, and the parameter values of the physical expression corresponding to the vector model include physical property values of the incident signal represented by the vector and physical property values of the reflected signal, and expressions corresponding to the vector model The value is the reflection coefficient, where the reflection coefficient is a vector value. Step S206, obtaining a standing wave ratio according to the reflection coefficient. Through the above steps of the embodiment, the vector detection method is adopted, and the reflection coefficient is obtained by abstracting the standing wave ratio detecting device into a vector model without using the condition limitation, and using the expression corresponding to the vector model. And the standing wave ratio is obtained, thereby eliminating the conditional limitation of the standing wave ratio scalar detecting method on the standing wave ratio detecting system, and solving the problem that the existing scalar standing wave ratio detecting method has low accuracy and inaccuracy of standing wave ratio detection, and The detection accuracy of the standing wave ratio is effectively improved. For the vector model, there are a variety of vector models in the prior art, and different vector modules can be selected according to different needs, which will be described below in conjunction with the preferred embodiments. The manner of obtaining the vector representation of the physical attribute values of the incident signal and the reflected signal may include a plurality of types, which may be selected according to actual needs. For example, in the case where the measuring device can measure the vector, the vector measuring device can be used to obtain a vector representation of the physical property values of the incident signal and the reflected signal, respectively. This way of obtaining is simple. For another example, in the case that the measuring device can only measure the scalar quantity, the scalar measuring device can be used to respectively obtain two different types of scalar values of the incident signal and the reflected signal, and then obtain according to different types of scalar values. A vector representation of the physical property values of the incident and reflected signals. The medium acquisition method can obtain a vector representation of physical property values of the incident signal and the reflected signal on the basis of the existing scalar measuring device, and is relatively common. Of course, the above two methods can be used alone or in combination with each other to obtain a vector representation of the physical property values of the incident signal and the reflected signal. Preferably, two different types of scalar values are power values and phase values. In the vector model, the corresponding expression contains constant parameters. For a vector model, there may be different numbers of constant values (for example, three), then three sets of reflection coefficients and incident signals and reflections are required. The vector value of the physical property value of the signal constitutes three ways to calculate three different constants. That is, the number of equations corresponding to the number of constants can be constructed. The method for obtaining the constant parameters in the expression can include a plurality of types, and can be selected according to actual needs. For example, a plurality of sets of known fixed loads obtained by using the standing wave ratio detecting means may respectively obtain vector values of physical property values of the fixed incident signal and the reflected signal by acquiring the reflection coefficient, for example, the standing wave ratio detecting means is open, In the case of short circuit and perfect match, respectively, corresponding to the vector values of the physical values of the fixed incident signal and the reflected signal; respectively, and then the constant values in the vector model are obtained from the reflection coefficient and the vector value of the physical property values of the incident signal and the reflected signal. . This way of obtaining through the special values corresponding to the three special cases is general. For another example, the amplitude of the reflection coefficient is obtained according to the measured power values of the incident signal and the reflected signal, and the phase value of the reflection coefficient is obtained according to the measured phase values of the incident signal and the reflected signal; and the vector values according to the plurality of sets of reflection coefficients and The vector values of the physical property values of the incident and reflected signals result in constant values in the vector model. This method is suitable when the device that measures the data can only measure the scalar. Of course, the above methods can be used alone or in combination with each other to obtain constant parameter values in the expression. In this embodiment, a standing wave ratio obtaining device is further provided, which is used to implement the above embodiments and preferred embodiments thereof, and has not been described again, and the following relates to the device. Each module is described. As used hereinafter, the term "module" may implement a combination of software and/or hardware of a predetermined function. Although the systems and methods described in the following embodiments are preferably implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated. 3 is a structural block diagram of a standing wave ratio acquisition apparatus according to an embodiment of the present invention. As shown in FIG. 3, the apparatus includes a first acquisition module 30, an abstraction module 32, and a second acquisition module 34. The module and its functions are described. The first obtaining module 30 is configured to respectively obtain vector representations of physical attribute values of the incident signal and the reflected signal; the abstract module 32 is coupled to the first obtaining module 30, and the abstracting module 32 is configured to abstract the standing wave ratio detecting device into a vector The parameter value of the physical expression corresponding to the model, the physical value of the incident signal represented by the vector and the physical property value of the reflected signal, and the value of the expression corresponding to the vector model is a reflection coefficient, wherein the reflection coefficient is a vector The second acquisition module 34 is coupled to the abstraction module 32, which is arranged to acquire the standing wave ratio based on the reflection coefficient. Preferably, the first obtaining module 30 is configured to obtain a vector representation in a plurality of manners, for example, a vector representation of physical property values of the incident signal and the reflected signal respectively by measurement; and, for example, respectively, the incident signal is obtained by measurement Two different types of scalar values of the reflected signal, according to different types of scalar values to obtain a vector representation of the physical property values of the incident signal and the reflected signal, preferably, two different types of scalar values are power values And phase values. The above two acquisition methods may be applied separately or in combination with each other to obtain a vector representation. Preferably, the abstraction module 32 can obtain the constant values in the vector model in a plurality of different manners, for example, acquiring the transmission parameters in the plurality of sets of known fixed loads obtained by using the standing wave ratio detecting means respectively corresponding to the fixed incident and reflected signals. a vector value of a physical attribute value, for example, the standing wave ratio detecting means respectively corresponds to a vector value of a physical value of a fixed incident signal and a reflected signal in the case of an open circuit, a short circuit, and a perfect match; according to the reflection coefficient and the incident signal and the reflection The vector value of the physical property value of the signal is obtained as a constant value in the vector model; for example, the amplitude of the reflection coefficient is obtained according to the measured power value of the incident signal and the reflected signal, and the phase of the incident signal and the reflected signal are obtained according to the measurement. The value obtains the phase value of the reflection coefficient; the vector value according to the plurality of sets of reflection coefficients And the vector values of the physical property values of the incident signal and the reflected signal are obtained as constant values in the vector model. The above two acquisition methods may be applied separately or in combination with each other to obtain a constant value in the vector model. The following is a description of a preferred embodiment in combination with the above-described embodiments and preferred embodiments thereof. In the preferred embodiment, the standing wave ratio scalar detection method is eliminated by a standing wave ratio vector detection method. The ratio detecting device is abstracted into a vector model, which can be abstracted into different vector models according to components of the standing wave ratio detecting device and their ports, for example, may be a dual port vector model, a three-port vector model, etc., thereby eliminating the pair The condition of the standing wave ratio detection system is limited, thereby improving the detection accuracy of the standing wave ratio. Hereinafter, a standing wave ratio vector detecting device according to a preferred embodiment of the present invention will be described by taking a standing wave ratio dual port detecting device in a wireless system as an example. 4 is a schematic diagram of a standing wave ratio detecting device in a wireless system according to the related art. As shown in FIG. 4, the device includes a signal source generator (also referred to as a signal source generator) 400, a signal transmitting link 402, and a signal amplifier. 404, coupler 406, filter 408, antenna system (ANT) 410, 2-to-1 switch 412, signal detection link 414, and signal detector 416. The various components of the device and their functions are described below. The signal source generator 400 mainly generates a signal source that needs to be transmitted. It should be noted that it may be from another device or a separate signal generator. The signal transmission link 402 is coupled to the signal source generator 400 and is primarily configured to transmit signals that need to be transmitted, which may be constructed of a number of elements. Signal amplifier 404 is coupled to signal transmission link 402 and is primarily configured to perform amplification processing of the signal. Coupler 406 is coupled to signal amplifier 404 and is primarily configured to couple the transmit and reflected signals for detection. The filter 408 is connected to the coupler 406, and is mainly configured to complete the filtering of the signal to ensure the transmission purity of the signal, and may also be set to perform separation of the transmission and reception. The ANT410 is primarily set to transmit signals. The 2-to-1 switch 412 is coupled to the coupler 406 and the filter 408, and is primarily configured to perform a 2-to-1 function of the transmitted and reflected signals. The signal detection link 414 is connected to the 2-to-1 switch 412, which is primarily configured to complete the reception of the transmitted and reflected signals for easy detection. It can be composed of a number of independent elements. Signal detector 416 is coupled to signal detection link 414, primarily to detect the completion of the signal, and can be any device with automatic processing capabilities (eg, conventional CPUs, DSPs, FPGAs, etc.). The VSWR detection device in the wireless system of FIG. 4 is a vector model. Since the device is a two-port network, no matter how many components of the incident signal and the reflected signal are transmitted and each component is a dual port, the final abstraction is A dual port S-parameter model is used to represent. 5 is a schematic diagram of an abstract vector model of a standing wave ratio detecting device in a wireless system according to a limited embodiment of the present invention. As shown in FIG. 5, the vector model of the dual port will be described. As shown in FIG. 5, ^V TMD is a transmission signal, ^V « ^ is a reflection signal, and S11, S12, S21, and S22 are parameters of the model. According to the vector model, an expression of the reflection coefficient can be accurately obtained as follows: Oh,

(6), among them,

Entering the formula (6), we can see that the reflection coefficient can be accurately obtained as long as the "^ ₂₂ ' in the formula (6) can be obtained. Since S11, S12, S21, and S22 are the parameters of the model, and the above parameters Are constant,

S ₂₂ = B, S _T

Can thus be ^{Λ ιι} ²² 'by an amount of three three constants used here instead of ^Λ "in place, wherein, A, B, C is a constant complex number having a three phase and amplitude characteristics. According to the above alternatives, the formula (6) Can be converted to formula (7).

B * S, -A *B + C (7); The calculation steps of the preferred embodiment will be described below according to the formula (7), and there are various methods for solving the constant in the formula (7). Method 1 : Obtain a reflection coefficient corresponding to a vector value in the case where the standing wave ratio detecting device is open, short, and fully matched, wherein the open circuit, the short circuit, and the perfect match respectively correspond to the physical values of the fixed incident signal and the reflected signal. Vector value; Then, a constant value in the vector model is obtained from the reflection coefficient and the vector value of the physical property values of the incident signal and the reflected signal. Step one can be calculated in real time by using the method of solving the phase and amplitude in the second method. Step 2: The three unknowns can be obtained by using ¹ ^ for three known cases without loss of generality. Usually, three special cases are used, namely open circuit, short circuit and matching to obtain three equations. The 1 ^ 1 corresponding to these three cases is divided into three values of 0, -1 and 1, and the phases correspond to 0, 180 and 0, respectively. At the same time, in these three cases, ^κ^-^^ can be calculated separately, where '"- ^Μ ' is the value of the matching case, '"-°, which is the value of the open circuit case, in the case of short circuit The "value, so that the constant number of AACs in equation (7) can be calculated from three sets of known quantities. Step three, through the simultaneous equations can be calculated:

A = S _i „

e _ e C = 2(S,.„—.―

Usually these three sets of values can be obtained in advance and saved in step four. Using the formula (7) and the advance amount obtained in step three can accurately obtain the reflection coefficient.

^Γ Also, since all calculations are calculated using vector values, the resulting reflection coefficient is also a vector value, and all quantities in equation (7) are vectors, and any vector has amplitude and phase information. Thereby the standing wave ratio is accurately obtained. Method 2, obtaining the amplitude of the reflection coefficient according to the measured power values of the incident signal and the reflected signal, and obtaining the phase value of the reflection coefficient according to the measured phase values of the incident signal and the reflected signal; and the vector values according to the plurality of sets of reflection coefficients and The vector values of the physical property values of the incident and reflected signals result in constant values in the vector model. This method is suitable when the device that measures the data can only measure the scalar. Of course, the above methods can be used alone or in combination with each other to obtain constant parameter values in the expression. 6 is a schematic diagram of an abstracted reflected signal detection path and an incident signal detection path according to a preferred embodiment of the present invention. As shown in FIG. 6, it should be noted that, in the standing wave ratio detection system, no matter how much signal transmission has passed. The components can always be abstracted into a reflected signal detection path and an incident signal detection path. Before performing amplitude and phase detection, it is first necessary to obtain the loop delay between the forward signal ΤΧ detection point and the detection point of the incident signal FWD. Only when the delay of the loop is known, the delay is started after detecting the forward signal. The delay time of the road is to detect the transmitted signal and the reflected signal to ensure that the two parts of the signal are generated by the same segment. It is convenient to calculate the phase and amplitude of each signal after acquiring the delay of the loop in advance. FIG. 7 is a flowchart of a method for acquiring a loop delay according to a preferred embodiment of the present invention. As shown in FIG. 7, the method includes the following steps: Step S702, turning on a signal source generator. Step S704, simultaneously acquiring the signal 产生 generated by the signal source and the transmitted incident signal FWD. Step S706, correlating the TX signal and the FWD signal to obtain a correlation peak. In step S708, it is determined whether or not there is a correlation peak. If the determination is yes, the process goes to step S712. If the determination is no, the process proceeds to step S710. In step S710, the sampling length of the FWD signal is increased, and the process goes to step S704. Step S712, acquiring points corresponding to the correlation peaks. Step S714, acquiring a delay of the entire loop. The calculation method and steps of the phase and amplitude of the reflection coefficient will be described below with reference to the abstract schematic diagram of the path detection shown in FIG. 6. FIG. 8 is a flowchart of a method for acquiring a phase of a reflection coefficient ¹ ^ according to a preferred embodiment of the present invention. As shown in FIG. 8, the method includes the following steps: Step S802: determining whether a signal transmitter has a signal, and determining a result If it is no, it is directly terminated. If the determination is YES, step S804 is executed. In step S804, the RF switch is selected to the FWD, and the TX and FWD data of the same length are simultaneously collected and saved while ensuring the start of the acquisition of the signal source TX signal and the start of the acquisition of the transmission signal FWD. In step S806, the RF switch is selected to the REV, and the TX and REV data of the same length are simultaneously acquired and saved in the case of ensuring the start of the acquisition of the signal source TX signal and the start of the acquisition of the reflected signal REV. Step S808: Calculate the sliding correlation process by using the collected TX and FWD data, find the correlation peak, and perform data alignment processing to determine the phase change of the FWD relative to the TX. For example, at a certain time, such as T0, a piece of data of TXO and FWD0 is simultaneously acquired, and then, after the correlation alignment process, the phase change amount ^Δφ() of FWD0 with respect to TX0 can be calculated. Step S810, calculating, by using the collected TX and REV data, performing a sliding correlation process, and after finding the correlation peak, performing data alignment processing to obtain a change value of the phase of the REV relative to the TX. For example, if the detection channels of FWD and REV are independent, then a piece of data of TX0 and REVO at the time of TO is simultaneously acquired while acquiring the forward data, and then the phase change of REVO with respect to TX0 can be calculated by the relevant alignment process. The amount ^ΔΨQ . For another example, if the channels detected by the FWD and the REV are multiplexed, the purpose of ensuring that the link has no phase fluctuation during this period of time is within the time interval of the second generation after the completion of the forward acquisition. For example, at the time T1, a piece of data of TX1 and REV1 is simultaneously acquired, and the phase change amount ΔΨ1 of REV1 with respect to TX1 can also be obtained. Step S812, using the phase difference value of the REV relative to the TX minus the phase difference value of the FWD relative to the TX

The phase difference of REV relative to FWD. S卩, ΔΦ0 and ρ ΔΨ0, or the difference between ΔΦ0 and ΔΨ1 is the corresponding phase. Since the channels of the incident signal and the reflected signal are divided into two cases of independent and multiplexed, in the case of independent channels, the relevant data for calculating the power calculation of the incident signal and the reflected signal can be directly obtained by measurement. However, in the case of channel multiplexing, the related process is more complicated. The manners for obtaining the amplitude of the reflection coefficient ^ in the case of channel independence and multiplexing are separately described below. FIG. 9 is a flowchart of a method for acquiring the amplitude of a channel independent reflection coefficient ^ according to a preferred embodiment of the present invention. As shown in FIG. 9, the method includes the following steps: Step S902: determining whether a signal transmitter has a signal, If the result of the determination is negative, the process is directly terminated. If the determination is YES, step S904 is executed. In step S904, the RF switch is selected to the FWD, and the TX and FWD data of the same length are simultaneously acquired and saved while ensuring the start of the acquisition of the signal source TX signal and the start of the acquisition of the transmission signal FWD. In step S906, the RF switch is selected to the REV, and the TX and REV data of the same length are simultaneously acquired and saved in the case of ensuring the start of the acquisition of the signal source TX signal and the start of the acquisition of the reflected signal REV. Step S908, directly calculating the average power of the incident signal according to the measured data and the calculation formula of the average power. And the average power of the reflected signal. .

Step S910, utilizing

The magnitude of the reflection coefficient can be obtained. FIG. 10 is a flowchart of a method for acquiring the amplitude of a reflection coefficient during channel multiplexing according to a preferred embodiment of the present invention. As shown in FIG. 10, the method includes the following steps: Step S1002: determining whether a signal transmitter has a signal, If the result of the determination is negative, the process is directly terminated. If the determination is YES, step S1004 is executed. In step S1004, the RF switch is selected to the FWD, and the delay of the acquisition of the signal source TX and the start of the acquisition of the transmission signal FWD are simultaneously acquired as the loop delay, and the same length data of the TX and the FWD are simultaneously collected and saved. The correlation alignment can accurately obtain the delay of the link of the forward signal TX and the link of the transmission signal detection point. In step S1006, the RF switch is selected to the REV, and the delay of the start of the acquisition of the signal source TX and the start of the acquisition of the reflected signal REV is the same as the loop delay, and the same length data of the TX and the REV are simultaneously collected and saved, where the power is involved. In the detected system, it is detected that the power of TX0 is detected at the time of detecting the forward direction, such as the TO time. Then the reflection and incident signals are detected at a time delay of ⁷ ^. Step S1008, calculating two average powers by using the collected TX and FWD data and passing Gtx=Pwr

(FWD) -Pwr(TX) acquires the loop gain. Using the TX0 and FW0 data acquired simultaneously for the phase ^Δφ0 , the power of the segment data is calculated, which is generally the mean power, respectively: And ^. With these two powers, the gain of the entire transmission path of the signal can be calculated: ^{G = P} FMX > _ ^P . Step S1010: Calculate two average powers by using the collected TX and REV data, and calculate the FWD corresponding to the REV at the moment by using the loop gain calculated in the previous step, that is, Pwr (FWD)=Pwi<TX)+Gtx. The τχο and REVO data acquired at the same time as the phase ΔΨ0, respectively calculate the power of the segment data, generally the mean power, respectively: ^P w and ⁵ «^. , use χ. And the gain calculated in step S1008, taking into account that the time of the two calculations is short, the gain of the path of the entire transmitted signal is constant, so it can be calculated that the accurate incident signal at the current reflected signal is: P excitation ^{0 = P} Txo + G _TXO . Step S1012, using the obtained FWD and REV powers, the amplitude of the reflection coefficient can be calculated, respectively

I r _L |=

Calculated ^. And ^ρ « ^. The amplitude of the reflection coefficient can be obtained by using ^{p wdo} . In another embodiment, a standing wave ratio acquisition software is also provided, which is used to implement the technical solutions described in the above embodiments and preferred embodiments. In another embodiment, a storage medium is also provided, the software being stored, including but not limited to an optical disk, a floppy disk, a hard disk, a rewritable memory, and the like. Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device so that they may be stored in the storage device by the computing device, or they may be separately fabricated into individual integrated circuit modules, or Multiple modules or steps are made into a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

A method for obtaining a standing wave ratio, comprising:

Obtaining, respectively, a vector representation of physical property values of the incident signal and the reflected signal; abstracting the standing wave ratio detecting device into a vector model, the parameter value of the physical expression corresponding to the vector model including the physicality of the incident signal represented by the vector An attribute value and a physical attribute value of the reflected signal, where the value of the expression corresponding to the vector model is a reflection coefficient, wherein the reflection coefficient is a vector value;

The standing wave ratio is obtained according to the reflection coefficient.

2. The method according to claim 1, wherein the vector representations of the physical property values of the incident signal and the reflected signal are respectively obtained:

A vector representation of the physical property values of the incident and reflected signals is obtained by measurement, respectively.

3. The method according to claim 1 or 2, wherein the vector representations of the physical property values of the incident signal and the reflected signal are respectively obtained:

Two different types of scalar values of the incident signal and the reflected signal are obtained by measurement, respectively, and a vector representation of the physical property values of the incident signal and the reflected signal is obtained according to the different types of scalar values.

4. The method of claim 3, wherein the two different types of scalar values are power values and phase values.

5. The method according to claim 1, wherein obtaining a constant value in the vector model comprises:

Acquiring a vector value of the physical property value of the fixed incident signal and the reflected signal corresponding to the plurality of sets of known fixed loads obtained by using the standing wave ratio detecting device;

A constant value in the vector model is obtained based on the reflection coefficient and a vector value of the incident signal and the physical property value of the reflected signal.

The method according to claim 1 or 5, wherein the obtaining the constant value in the vector model comprises: obtaining the amplitude of the reflection coefficient according to the measured power value of the incident signal and the reflected signal, according to Measuring the phase values of the incident signal and the reflected signal to obtain a phase value of the reflection coefficient; A constant value in the vector model is obtained based on a plurality of sets of vector values of the reflection coefficients and vector values of physical values of the incident signal and the reflected signal.

7. A standing wave ratio acquisition device, comprising:

a first acquiring module, configured to respectively obtain a vector representation of physical property values of the incident signal and the reflected signal;

An abstraction module, configured to abstract the standing wave ratio detecting device into a vector model, wherein the parameter value of the physical expression corresponding to the vector model includes a physical property value of the incident signal represented by a vector and a physical property of the reflected signal a value, the value of the expression corresponding to the vector model is a reflection coefficient, wherein the reflection coefficient is a vector value;

The second obtaining module is configured to acquire the standing wave ratio according to the reflection coefficient.

8. The apparatus according to claim 7, wherein the first obtaining module is configured to acquire the vector representation by at least one of:

Obtaining a vector representation of physical property values of the incident signal and the reflected signal by measurement; respectively obtaining two different types of scalar values of the incident signal and the reflected signal by measurement, according to different types of scalar values Obtaining a vector representation of physical property values of the incident signal and the reflected signal.

9. Apparatus according to claim 8 wherein the two different types of scalar values are power values and phase values.

10. The apparatus of claim 7, wherein the abstraction module is configured to obtain a constant value in the vector model according to at least one of:

Obtaining, by the plurality of sets of known fixed loads obtained by using the standing wave ratio detecting device, the vector values of the physical property values of the incident signal and the reflected signal respectively; according to the reflection coefficient and the incident signal And a vector value of a physical property value of the reflected signal to obtain a constant value in the vector model;

Obtaining an amplitude of the reflection coefficient according to the measured power value of the incident signal and the reflected signal, and obtaining a phase value of the reflection coefficient according to the measured phase values of the incident signal and the reflected signal; A constant value in the vector model is obtained based on a plurality of sets of vector values of the reflection coefficients and vector values of physical values of the incident signal and the reflected signal.