CN102938904B - A kind of standing-wave ratio detecting method, device and base station - Google Patents

Abstract

The invention discloses a kind of standing-wave ratio detecting method, device and base station, belong to moving communicating field.The method comprises determining that equivalent parameters value S of one group of antenna for base station mouth at the frequency interested of base station；Obtain the power P of the forward signal of antenna for base station mouth_FWD, the power P of reverse signal_REV, and now phase contrast between forward signal and the phase place of reverse signalAccording to described S, P_FWD、P_REVWithDetermine standing-wave ratio.Pass through the present invention, on the basis of the amplitude information of base station forward and backward signal, three different loads are utilized to calibrate out by the phase information affecting standing-wave ratio, recycling amplitude and phase information obtain the standing-wave ratio of base station, improve the precision of standing-wave ratio, thus improve the accuracy of detection antenna-feedback system connection status.

Description

A kind of standing-wave ratio detecting method, device and base station

Technical field

The present invention relates to moving communicating field, particularly relate to detection method and the device of a kind of base station standing-wave ratio.

Background technology

Mobile communication base station needs to launch radiofrequency signal by antenna.But when antenna-feedback system (feeder line And antenna) when go wrong, downstream signal power can not effectively by aerial radiation to space. This is accomplished by base station and has the function that detection antenna-feedback system the most normally works, and the method generally detected is The standing-wave ratio of detection antenna for base station mouth reflects that antenna-feedback system the most normally works.

At present, the circuit structure of the standing-wave ratio of detection antenna for base station mouth mainly has following two: the first is as schemed The front reverse signal indirectly being obtained antenna for base station mouth by the bonder between power amplifier and duplexer shown in 1 Circuit structure；It two is being obtained by duplexer bonder at antenna for base station mouth as shown in Figure 2 The circuit structure of the front reverse signal of antenna for base station mouth.

If base station is able to detect that the front reverse signal of antenna for base station mouth, then when calculating standing wave, as long as knowing The power of reverse signal before road.But, according to the circuit structure shown in current Fig. 1, Fig. 2, actual It is difficult to accomplish directly to detect the power of the front reverse signal of antenna for base station mouth, between bonder and antenna for base station mouth At least existence of duplexer adaptor.Signal owing to detecting is not the signal of antenna for base station mouth, and Only the amplitude of detection signal and do not use the phase information of signal to seek standing-wave ratio, cause tried to achieve standing wave The trueness error of ratio is relatively big, and then causes the state of antenna feed system detected inaccurate.

Summary of the invention

The technical problem to be solved in the present invention is to provide one and amplitude and phase information can be utilized to detect standing wave The method of ratio, device and base station, solve not use phase information during traditional detection antenna for base station mouth standing-wave ratio And error is relatively big, thus the state of antenna feed system caused detects inaccurate problem.

In order to solve above-mentioned technical problem, according to an aspect of the present invention, the invention provides a kind of standing wave Ratio detection method, specifically includes:

Step one, determine equivalent parameters value S of one group of antenna for base station mouth at the frequency interested of base station；

Step 2, obtain the power P of forward signal of antenna for base station mouth_FWD, the power P of reverse signal_REV、 And now phase difference value between forward signal and the phase place of reverse signal

Step 3, according to S, P_FWD、P_REVWith Determine standing-wave ratio.

In order to solve above-mentioned technical problem, according to another aspect of the present invention, present invention also offers one Standing wave ration detection device, including:

Equivalent parameters acquisition module, for obtaining the equivalence of one group of antenna for base station mouth at the frequency interested of base station Parameter value S；

Power acquisition module, for obtaining the power P of the forward signal of antenna for base station mouth_FWDWith reverse signal Power P_REV；

Phase contrast acquisition module, for determining the phase contrast between described forward signal and the phase place of reverse signal

Standing-wave ratio determines module, for according to described S, P_FWD、P_REVWith Determine standing-wave ratio.

In order to solve above-mentioned technical problem, according to a further aspect of the invention, present invention also offers one Standing-wave ratio detection base station, including the standing wave ration detection device in technique scheme.

Use embodiments of the invention, compared with prior art, at base station forward signal and the width of reverse signal On the basis of degree information, three different loads are utilized to calibrate out by the phase information affecting standing-wave ratio, then Utilize amplitude and phase information to calculate standing-wave ratio, improve the precision of standing-wave ratio, thus improve detection antenna feeder The accuracy of system connection status.

Accompanying drawing explanation

Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes of the present invention Point, the schematic description and description of the present invention is used for explaining the present invention, is not intended that to the present invention not Work as restriction.In the accompanying drawings:

Fig. 1 is a kind of standing-wave ratio testing circuit structural representation of the prior art；

Fig. 2 is another standing-wave ratio testing circuit structural representation of prior art；

Fig. 3 is the equivalent structure schematic diagram of the standing-wave ratio testing circuit structure of prior art；

Fig. 4 is the equivalent parameters model schematic of the circuit structure of Fig. 3；

Fig. 5 is the flow chart of a kind of standing-wave ratio detecting method that the embodiment of the present invention one provides；

Fig. 6 is the structured flowchart of a kind of standing wave ration detection device that the embodiment of the present invention two provides.

Detailed description of the invention

In order to make the technical problem to be solved, technical scheme and beneficial effect clearer, bright In vain, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that herein Described specific embodiment, only in order to explain the present invention, is not intended to limit the present invention.

Embodiment one

It is the equivalent structure schematic diagram of the standing-wave ratio testing circuit structure of prior art as shown in Figure 3；Figure 4 is the equivalent parameters model schematic of the circuit structure of Fig. 3；If Fig. 5 is that the embodiment of the present invention one carries A kind of flow chart of the standing-wave ratio detecting method of confession.This is introduced below in conjunction with Fig. 3, Fig. 4 and Fig. 5 The method of bright embodiment, including:

Step S502, determine equivalent parameters value S of one group of antenna for base station mouth at the frequency interested of base station；

No matter it is the circuit structure shown in Fig. 1 or Fig. 2, can be with the equivalence of circuit structure as shown in Figure 3 Replace, can show that the equivalent parameters model such as Fig. 4 is tied according to the standing-wave ratio testing circuit structure shown in Fig. 3 Structure schematic diagram, will calculate base station standing-wave ratio accurately, needs Γ accurately_L。

Relational expression (1) can be obtained from the equivalent parameters model structure figure of Fig. 4:

${\mathrm{\Γ}}_{\mathrm{IN}}=S_{11}+\frac{S_{21}\×S_{12}\×{\mathrm{\Γ}}_L}{1-S_{22}\×{\mathrm{\Γ}}_L}---\left(1\right)$

Relational expression (2) can be obtained by relational expression (1)

${\mathrm{\Γ}}_L=\frac{{\mathrm{\Γ}}_{\mathrm{IN}}-S_{11}}{S_{12}\×S_{21}-S_{11}\×S_{22}+{\mathrm{\Γ}}_{\mathrm{IN}}{S}_{22}}---\left(2\right)$

Wherein, Γ_INFor from the radio-frequency module left side to the reflection coefficient in terms of right-hand member, Γ_LFor antenna for base station mouth Reflection coefficient, the two parameter is all vector, including amplitude and phase information.

Wherein, S₁₁、S₂₂、S₁₂×S₂₁It is equivalent parameters value S of one group of antenna for base station mouth, in Fig. 4 Being the S parameter of the network of 4 ports, S parameter is defined by the ratio of two plural numbers, including amplitude and phase place Information.S11 is port 2 reflection coefficient of port 1 when mating；S22 is port 1 port 2 when mating Reflection coefficient；S12 be port 1 when mating port 2 to the reverse transfer coefficient of port 1；S21 When mating for port 2, port 1 is to the forward transmission coefficient of port 2.It should be noted that these parameters It is all vector, does not comprise only the amplitude information of OFF signal, also include phase information, and base station is once fixed After type, S₁₁、S₂₂、S₁₂×S₂₁It is changeless.

And according to the definition of voltage reflection coefficient, have an equation below (3):

${\mathrm{\Γ}}_{\mathrm{IN}}=\frac{V_r}{V_i}=\sqrt{\frac{P_{\mathrm{REV}}}{P_{\mathrm{FWD}}}}\∠\mathrm{\φ}---\left(3\right)$

Wherein, V_iAnd V_rThe incident voltage on the difference representation module left side and reflected voltage, P_FWDBelieve for forward direction Forward signal power value at number coupling, P_REVFor the reverse signal power value at reverse signal coupling, For forward signal and the phase contrast of reverse signal.

Due in existing method in order to seek Γ_LTime, S parameter (is included S₁₁、S₂₂、S₁₂×S₂₁) make By approximately equal, and seeking Γ_INTime only used the power magnitude information of front reverse signal and do not used Phase information, therefore by Γ_LThere is bigger error in the base station standing-wave ratio obtained.Therefore, this step makes With the load of three known reflection coefficient base station calibrated the one group of S ginseng trying to achieve band phase information accurately Number (includes S₁₁、S₂₂、S₁₂×S₂₁), particularly as follows:

Antenna for base station mouth connects the load 1 of known S parameter, and the reflection coefficient of this load is Γ_L1.Base Transmitter The signal of frequency interested, utilizes two-way analog-digital converter directly to gather front reverse signal and obtains correspondence P_FWD1And P_REV1, then try to achieve the angle value ∠ V of reverse signal_REV1Angle value with forward signal ∠V_FWD1Phase contrast Γ is obtained further according to (3) formula_IN1。

Ibid, antenna for base station mouth connecing the load 2 of known S parameter, the reflection coefficient of this load is Γ_L2, The signal of Base Transmitter frequency interested, obtains the P of correspondence_FWD2、P_REV2And phase contrast Root again Γ is obtained according to (3) formula_IN2.It should be noted that Γ_L2It is not equal to Γ_L1。

Ibid, antenna for base station mouth connecing the load 3 of known S parameter, the reflection coefficient of this load is Γ_L3。 The signal of Base Transmitter frequency interested, obtains the P of correspondence_FWD3、P_REV3And phase contrast Root again Γ is obtained according to (3) formula_IN3.It should be noted that Γ_L3It is not equal to Γ_L1, also it is not equal to Γ_L2。

In above-mentioned steps, the selection of frequency interested is relevant to the band information of base station, such as this type Number RRU support 2110-2170MHz frequency range, then frequency interested is exactly 2110-2170MHz, Therefore have only to determine the S value of this frequency range.And the RRU of another one model supports 925-960MHz Frequency range, then just have only to obtain the S value of 925-960MHz frequency range.

The Γ tried to achieve by above three steps_IN1、Γ_IN2、Γ_IN3And known Γ_L1、Γ_L2、Γ_L3, generation respectively Enter in (2) formula, obtain 3 equations.Three unknown number: S are solved with these 3 equations₁₁、S₂₂、 S₁₂×S₂₁.Then can obtain one group of equivalent parameters value S at the frequency interested of base station and (include S₁₁、 S₂₂、S₁₂×S₂₁), it is saved as a table about the S information of frequency interested.

Step S504, obtain the power P of forward signal of antenna for base station mouth_FWD, the power of reverse signal P_REV, and the phase difference value of now forward signal and reverse signal

During base station operation, when needing to detect base station standing-wave ratio when antenna for base station mouth connects arbitrary load, pass through Two-way analog-digital converter sampling forward signal and reverse signal try to achieve the forward power PFWD of now antenna for base station mouth With backward power P_REV, then try to achieve now forward signal and the phase difference value of reverse signal Further according to (3) formula obtains the Γ being mentioned above_IN, thus not only use the power magnitude information of front reverse signal, and And use phase information, draw Γ more accurately_IN。

In this step, Can be obtained by two ways: obtain the phase place of described forward signal and described The phase place of reverse signal, determines that the difference of the phase place of described forward signal and the phase place of described reverse signal isOr obtain the first phase difference between phase place and the phase place of baseband signal of described forward signal, institute State the second phase difference between the phase place of reverse signal and the phase place of baseband signal, determine described first phase Difference between difference and described second phase difference is

Step S506, use S, P_FWD、P_REVWith Calculate standing-wave ratio.

Standing-wave ratio and the relational expression (4) of reflection coefficient:

$\mathrm{VSWR}=\frac{1+\left|{\mathrm{\Γ}}_L\right|}{1-\left|{\mathrm{\Γ}}_L\right|}---\left(4\right)$

The standing-wave ratio of now antenna for base station mouth can be tried to achieve in conjunction with formula (2), (3) and (4).

Preferably, after step S506, also include the step utilizing standing-wave ratio to determine state of antenna feed system.

The embodiment of the present invention uses the load of three known reflection coefficient base station is carried out calibration to try to achieve accurately Γ with phase information_L, thus obtain the standing-wave ratio of the higher antenna for base station mouth of degree of accuracy.

Embodiment two

If Fig. 6 is the structured flowchart of a kind of standing wave ration detection device that the embodiment of the present invention two provides, bag Include:

Equivalent parameters acquisition module 602, for obtaining one group of antenna for base station mouth at the frequency interested of base station Equivalent parameters value S；

Preferably, equivalent parameters acquisition module 602 specifically for: different in three connections of antenna for base station mouth Known reflection coefficient Γ_LiLoad, the signal of Base Transmitter frequency interested, obtain correspondence forward signal Power P_FWDi, the power P of reverse signal_REVi, and now phase between forward signal with reverse signal Potential difference Formula (3) is utilized to obtain Γ_INi；Wherein i=1,2,3；By Γ_INiAnd Γ_LiSubstitute into respectively Formula (2) obtains three equations, utilizes these three equation solution to obtain vector S₁₁、S₂₂And S₁₂×S₂₁ Value.

Power acquisition module 604, for obtaining the power P of the forward signal of antenna for base station mouth_FWDWith reversely letter Number power P_REV；The sampled value that specifically can use two-way analog-digital converter obtains P_FWDAnd P_REV。

Phase contrast acquisition module 606, for determining the phase contrast between forward signal and the phase place of reverse signal

Preferably, Determination can be: obtain phase place and the phase of described reverse signal of described forward signal Position, determines that the difference of the phase place of described forward signal and the phase place of described reverse signal is Or obtain institute State the first phase difference between the phase place of forward signal and the phase place of baseband signal, the phase of described reverse signal Second phase difference between position and the phase place of baseband signal, determines described first phase difference and described second Difference between phase difference value is

Standing-wave ratio determines module 608, for according to S, P_FWD、P_REVWith Determine standing-wave ratio.

This module is specifically for determining standing-wave ratio according to formula (2) (3) and (4).

Preferably, in order to make full use of the standing-wave ratio of present invention detection, this device also includes state of antenna feed system Determine module, for determining the state of antenna-feedback system according to standing-wave ratio.

The device of the embodiment of the present invention uses the load of three known reflection coefficient that base station is carried out calibration and tries to achieve standard The Γ of true band phase information_L, thus obtain the standing-wave ratio of the higher antenna for base station mouth of degree of accuracy.

Additionally, present invention also offers standing-wave ratio detection base station, a kind of base station, including above-mentioned detection device.With Sample, the technical scheme of embodiment one and embodiment two all can be suitable in this base station, the most no longer repeat.

Described above illustrate and describes the preferred embodiments of the present invention, but as previously mentioned, it should be understood that this Bright it is not limited to form disclosed herein, is not to be taken as the eliminating to other embodiments, and can be used for Other combinations various, amendment and environment, and can be in invention contemplated scope described herein, by above-mentioned religion Lead or the technology of association area or knowledge are modified.And the change that those skilled in the art are carried out and change do not take off From the spirit and scope of the present invention, the most all should be in the protection domain of claims of the present invention.

Claims (10)

1. a standing-wave ratio detecting method, it is characterised in that including:

Step one, determine equivalent parameters value S of one group of antenna for base station mouth at the frequency interested of base station；

Step 2, obtain the power P of forward signal of antenna for base station mouth_FWD, the power P of reverse signal_REV、 And now phase difference value between forward signal and the phase place of reverse signal

Step 3, according to described S, P_FWD、P_REVWithDetermine standing-wave ratio；

Wherein, described step one includes:

Different known reflection coefficient Γ is connected three times at antenna for base station mouth_LiLoad, Base Transmitter is interested The signal of frequency, obtains the power P of the forward signal of correspondence_FWDi, the power P of reverse signal_REViAnd this Time forward signal and reverse signal between phase contrastUtilize formulaRespectively To Γ_INi；Wherein i=1,2,3；Γ_INiFor connecing when i-th loads from the forward signal input of radio-frequency module See the reflection coefficient to antenna direction, Γ_LiFor connecing reflection coefficient during i-th load；

By Γ_INiAnd Γ_LiSubstitute into formula respectively:

${\mathrm{\Γ}}_L=\frac{{\mathrm{\Γ}}_{IN}-S_{11}}{S_{12}\×S_{21}-S_{11}\×S_{22}+{\mathrm{\Γ}}_{IN}{S}_{22}}$

Obtain three equations, utilize these three equation solution to obtain S₁₁、S₂₂And S₁₂×S₂₁Value, S₁₁ The reflection coefficient of port 1 when mating for port 2；S₂₂The reflection system of port 2 when mating for port 1 Number；S₁₂When mating for port 1, port 2 is to the reverse transfer coefficient of port 1；S₂₁Mate for port 2 Time port 1 to the forward transmission coefficient of port 2.

Method the most according to claim 1, it is characterised in that also include after described step 3:

Step 4, determine the state of antenna-feedback system according to described standing-wave ratio.

Method the most according to claim 1, it is characterised in that described step 2 includes:

The sampled value using analog-digital converter obtains described forward power and described backward power；

Phase place and the phase of described reverse signal of described forward signal is obtained by the sampled value of analog-digital converter Position, determines that the difference of the phase place of described forward signal and the phase place of described reverse signal isOr obtain institute State the first phase difference between the phase place of forward signal and the phase place of baseband signal, the phase of described reverse signal Second phase difference between position and the phase place of baseband signal, determines described first phase difference and described second Difference between phase difference value is

4. according to the method described in any one of claims 1 to 3, it is characterised in that described step three guarantees Include: according toDetermine standing-wave ratio, wherein,

And

Γ_LFor the reflection coefficient of antenna for base station mouth, Γ_INFor in terms of the forward signal input of radio-frequency module to sky The reflection coefficient in line direction.

5. a standing wave ration detection device, it is characterised in that including:

Equivalent parameters acquisition module, for obtaining the equivalence of one group of antenna for base station mouth at the frequency interested of base station Parameter value S；

Power acquisition module, for obtaining the power P of the forward signal of antenna for base station mouth_FWDWith reverse signal Power P_REV；

Phase contrast acquisition module, for determining the phase contrast between described forward signal and the phase place of reverse signal

Standing-wave ratio determines module, for according to described S, P_FWD、P_REVWithDetermine standing-wave ratio；

Described equivalent parameters acquisition module specifically for: connect different known reflections in antenna for base station mouth three times Coefficient Γ_LiLoad i, the signal of Base Transmitter frequency interested, obtain the power of forward signal of correspondence P_FWDi, the power P of reverse signal_REViAnd now phase contrast between forward signal and reverse signalUtilize formulaRespectively obtain Γ_INi；Wherein i=1,2,3；Γ_INiFor connecing To the reflection coefficient of antenna direction, Γ in terms of the forward signal input of radio-frequency module during i load_LiFor connecing Reflection coefficient during i load；

By Γ_INiAnd Γ_LiSubstitute into formula respectively:

${\mathrm{\Γ}}_L=\frac{{\mathrm{\Γ}}_{IN}-S_{11}}{S_{12}\×S_{21}-S_{11}\×S_{22}+{\mathrm{\Γ}}_{IN}{S}_{22}}$

Obtain three equations, utilize these three equation solution to obtain S₁₁、S₂₂And S₁₂×S₂₁Value, S₁₁ The reflection coefficient of port 1 when mating for port 2；S₂₂The reflection system of port 2 when mating for port 1 Number；S₁₂When mating for port 1, port 2 is to the reverse transfer coefficient of port 1；S₂₁Mate for port 2 Time port 1 to the forward transmission coefficient of port 2.

Device the most according to claim 5, it is characterised in that described device also includes: antenna feeder system System state determining module, for determining the state of antenna-feedback system according to described standing-wave ratio.

Device the most according to claim 5, it is characterised in that

Described power acquisition module, for using the sampled value of analog-digital converter to obtain described P_FWDWith P_REV。

Device the most according to claim 5, it is characterised in that described phase contrast acquisition module is specifically used In:

Obtain phase place and the phase place of described reverse signal of described forward signal, determine the phase of described forward signal The difference of the phase place of position and described reverse signal isOr obtain phase place and the base band letter of described forward signal Number phase place between first phase difference, between phase place and the phase place of baseband signal of described reverse signal Second phase difference, determines that the difference between described first phase difference and described second phase difference is

9. according to the device according to any one of claim 5 to 8, it is characterised in that described standing-wave ratio is true Cover half block specifically for:

According toDetermine standing-wave ratio, wherein,

And

Γ_LFor the reflection coefficient of antenna for base station mouth, Γ_INFor in terms of the forward signal input of radio-frequency module to sky The reflection coefficient in line direction.

10. a standing-wave ratio detection base station, it is characterised in that described base station includes that claim 5 to 9 is arbitrary A kind of standing wave ration detection device described in Xiang.