CN103297154A - Method and device for detecting standing-wave ratio - Google Patents
Method and device for detecting standing-wave ratio Download PDFInfo
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- CN103297154A CN103297154A CN2012100484960A CN201210048496A CN103297154A CN 103297154 A CN103297154 A CN 103297154A CN 2012100484960 A CN2012100484960 A CN 2012100484960A CN 201210048496 A CN201210048496 A CN 201210048496A CN 103297154 A CN103297154 A CN 103297154A
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Abstract
The invention provides a method and device for detecting the standing-wave ratio. The power Pr of reflected signals is obtained according to the actual voltage V2 of the reflected signals of a reflected power detecting point. Due to the fact that the power Pr is not affected by output signals leaked by a circulator, the method and device for detecting the standing-wave ratio can guarantee the detecting accuracy of the standing-wave ratio.
Description
Technical field
The present invention relates to wireless equipment antenna mouth standing-wave ratio detection technique.
Background technology
At present, Chang Gui standing-wave ratio testing circuit generally adopts circulator or directional coupler that reflected signal is separated with transmitting.Be example with the circulator, the work block diagram as shown in Figure 1.Particularly, standing-wave ratio detecting method is: the power according to the power output test point obtains output signal power Pt, obtains reflection signal power Pr according to the power of reflection power test point, according to resulting output signal power Pt and reflection signal power Pr, according to
Obtain reflection coefficient Γ, last, according to
Can obtain the standing-wave ratio VSWR of load.
From the basic functional principle that above-mentioned conventional standing-wave ratio detects, as can be known, higher standing-wave ratio accuracy of detection be expected, must real reflection signal power can be detected.Yet there is leakage signal problem (as shown in Figure 2) in 1 mouthful to 3 mouthfuls meeting of circulator, will cause like this in actual applications: the signal that detects on the reflection power test point be actually reflected signal and circulator go up for 3 mouthfuls the output signals revealed and.If circulator isolation relatively poor (can cause leakage signal bigger) or load standing-wave ratio fine (can cause reflected signal too small), the detected power of reflection power test point can not accurately reflect the power of reflected signal.This just causes final standing-wave ratio accuracy of detection relatively poor.So the standing-wave ratio accuracy of detection depends on the isolation of circulator.
This shows, owing to the isolation to circulator relies on, make existing standing-wave ratio detecting method have the problem of accuracy of detection difference in actual applications.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of standing-wave ratio detecting method and device, can improve the standing-wave ratio accuracy of detection.
In order to achieve the above object, the technical scheme of the present invention's proposition is:
A kind of standing-wave ratio detecting method, this method may further comprise the steps:
On standing wave detection circuit, a tone signal is sent as the transmission signal that is used for the test standing-wave ratio, make described tone signal work in the frequency sweep state, and carrying out on each frequency of frequency sweep, the voltage V3 of reflection power test point on the standing wave detection circuit is detected; Wherein, the launching electrical level of described transmission signal on all frequencies is identical preset value X, the frequency point ranges of described frequency sweep is from f1 to f2, frequency sweep is spaced apart default spacing value f3, described f1 is the initial frequency of carrying out the working frequency range of the Wireless Telecom Equipment that standing-wave ratio detects, and described f2 is the cut-off frequency of the working frequency range of described Wireless Telecom Equipment;
B, the voltage V3 of detected all frequencies, select maximum V3max and minimum value V3min when carrying out described frequency sweep, and according to
Obtain the real voltage V2 of the reflected signal of reflection power test point on the described standing wave detection circuit, according to described real voltage V2, obtain the reflection power Pr of reflection power test point on the described standing wave detection circuit;
C, according to described reflection power Pr and described output signal power Pt, obtain corresponding standing-wave ratio VSWR.
A kind of standing wave ration detection device, this device comprises:
The reflected voltage detecting unit, be used at standing wave detection circuit, a tone signal is sent as the transmission signal that is used for the test standing-wave ratio, make described tone signal work in the frequency sweep state, and carrying out on each frequency of frequency sweep, the voltage V3 of reflection power test point on the standing wave detection circuit is detected; Wherein, the launching electrical level of described transmission signal on all frequencies is identical preset value X, the frequency point ranges of described frequency sweep is from f1 to f2, frequency sweep is spaced apart default spacing value f3, described f1 is the initial frequency of carrying out the working frequency range of the Wireless Telecom Equipment that standing-wave ratio detects, and described f2 is the cut-off frequency of the working frequency range of described Wireless Telecom Equipment;
The real voltage computing unit is used for the voltage V3 of detected all frequencies when carrying out described frequency sweep, selects maximum V3max and minimum value V3min, and according to
Obtain the real voltage V2 of the reflected signal of reflection power test point on the described standing wave detection circuit, according to described real voltage V2, obtain the reflection power Pr of reflection power test point on the described standing wave detection circuit;
Standing-wave ratio is calculated the unit, is used for according to described reflection power Pr and described output signal power Pt, obtains corresponding standing-wave ratio VSWR.
In sum, standing-wave ratio detecting method and device that the present invention proposes, according to
Obtain the real voltage V2 of the reflected signal of reflection power test point; according to this real voltage and then obtain the power P r of reflected signal; because the output signal that this power is not revealed by circulator influences, and therefore, can guarantee the precision based on the resulting standing-wave ratio detected value of this power P r.
Description of drawings
Fig. 1 is conventional standing-wave ratio testing circuit schematic diagram;
Fig. 2 is that the output signal in the conventional standing-wave ratio testing circuit is revealed schematic diagram;
Fig. 3 is the standing-wave ratio detecting method flow chart of the embodiment of the invention one;
Fig. 4 is the standing wave ration detection device structural representation of the embodiment of the invention one.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with the accompanying drawings and the specific embodiments.
At first, realization principle of the present invention is described:
Suppose that the power amplifier output signal is V1 through signal (hereinafter to be referred as " the leakage signal ") voltage amplitude that circulator is leaked to the reflection power test point, reflected signal is V2 at the voltage amplitude of reflection power test point, and the voltage amplitude after each signal of reflection power test point is synthetic is V3.
If the phase place of 1 V1 is identical with the phase place of V2, this moment, the voltage V3 of reflection power test point was maximum V3max, and: V3max=V2+V1---------------is 1.
If the phase place of 2 V1 is opposite with the phase place of V2, this moment, the voltage V3 of reflection power test point was minimum value V3min, and: V3min=V2-V1-----------------is 2.
Under these two kinds of scenes, if the amplitude of V1 and V2 is constant, 1. formula and 2. formula addition can obtain V3max+V3min=2*V2, so
Can obtain reflected signal in the real voltage amplitude of reflection power test point by V3max and V3min, magnitude of voltage can calculate real reflection signal power thus.Can see that from above-mentioned analysis the isolation that the computational process of above-mentioned real reflection signal power has been broken away from circulator relies on.
Based on above-mentioned principle, core concept of the present invention is: use frequency sweep method, obtain maximum voltage and the minimum voltage of reflection power test point, and then obtain real reflection signal power according to both, thereby can obtain standing-wave ratio detected value accurately.
Fig. 3 is the method flow diagram of the embodiment of the invention one, and as shown in Figure 3, this standing-wave ratio detecting method may further comprise the steps:
Wherein, the launching electrical level of described transmission signal on all frequencies is identical preset value X, the frequency point ranges of described frequency sweep is from f1 to f2, frequency sweep is spaced apart default spacing value f3, described f1 is the initial frequency of carrying out the working frequency range of the Wireless Telecom Equipment that standing-wave ratio detects, and described f2 is the cut-off frequency of the working frequency range of described Wireless Telecom Equipment.
Here need to prove, in the frequency sweep process, only need guarantee that the launching electrical level of described transmission signal on all frequency sweep frequencies is identical, and the output signal power Pt on all frequency sweep frequencies is identical, and concrete X value only need get final product in the working range of the Wireless Telecom Equipment that carries out the standing-wave ratio detection.Like this, under the constant situation of power amplifier phase of output signal, because the phase shift effect of filter on the transmission path, the phase place of each frequency reflected signal can be different, cause the detected signal of reflection power test point (leakage signal and reflected signal and) voltage to change along with the change of test frequency.Usually, the reflected signal phase place changes 360 degree to I haven't seen you for ages in the process of frequency traversal, in 360 degree scopes, always a V3max and a V3min occur, can calculate real reflection signal power and standing-wave ratio accordingly.
In actual applications, frequency sweep is the smaller the better at interval, because frequency sweep is more little at interval, the V3max and the V3min error that obtain are more little, standing-wave ratio is calculated also just more accurate, but corresponding test point increases and can cause the testing time elongated, and during specific implementation, those skilled in the art can arrange suitable frequency sweep spacing value according to actual needs based on above-mentioned rule.
Here, the real voltage V2 of the reflected signal of reflection power test point obtains because the acquisition of reflection power Pr is based on, and therefore, the output signal that this reflection power Pr is not revealed by circulator influences, be accurately, thereby can guarantee to calculate based on this in the subsequent step accuracy of standing-wave ratio.
Particularly, obtain reflection power Pr according to described real voltage V2, those skilled in the art can adopt existing method to realize, do not repeat them here.
In this step, obtain standing-wave ratio VSWR according to described reflection power Pr and described output signal power Pt, those skilled in the art can adopt existing method to realize, do not repeat them here.
Fig. 4 is the standing wave ration detection device structural representation corresponding with said method, and as shown in Figure 4, this device comprises:
The reflected voltage detecting unit, be used at standing wave detection circuit, a tone signal is sent as the transmission signal that is used for the test standing-wave ratio, make described tone signal work in the frequency sweep state, and carrying out on each frequency of frequency sweep, the voltage V3 of reflection power test point on the standing wave detection circuit is detected; Wherein, the launching electrical level of described transmission signal on all frequencies is identical preset value X, the frequency point ranges of described frequency sweep is from f1 to f2, frequency sweep is spaced apart default spacing value f3, described f1 is the initial frequency of carrying out the working frequency range of the Wireless Telecom Equipment that standing-wave ratio detects, and described f2 is the cut-off frequency of the working frequency range of described Wireless Telecom Equipment.
The real voltage computing unit is used for the voltage V3 of detected all frequencies when carrying out described frequency sweep, selects maximum V3max and minimum value V3min, and according to
Obtain the real voltage V2 of the reflected signal of reflection power test point on the described standing wave detection circuit, according to described real voltage V2, obtain the reflection power Pr of reflection power test point on the described standing wave detection circuit.
Standing-wave ratio is calculated the unit, is used for according to described reflection power Pr and described output signal power Pt, obtains corresponding standing-wave ratio VSWR.
In sum, more than be preferred embodiment of the present invention only, be not for limiting protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (2)
1. a standing-wave ratio detecting method is characterized in that, this method may further comprise the steps:
A, on standing wave detection circuit, a tone signal is sent as the transmission signal that is used for the test standing-wave ratio, make described tone signal work in the frequency sweep state, and carrying out on each frequency of frequency sweep, the voltage V3 of reflection power test point on the standing wave detection circuit is detected; Wherein, the launching electrical level of described transmission signal on all frequencies is identical preset value X, the frequency point ranges of described frequency sweep is from f1 to f2, frequency sweep is spaced apart default spacing value f3, described f1 is the initial frequency of carrying out the working frequency range of the Wireless Telecom Equipment that standing-wave ratio detects, and described f2 is the cut-off frequency of the working frequency range of described Wireless Telecom Equipment;
B, the voltage V3 of detected all frequencies, select maximum V3max and minimum value V3min when carrying out described frequency sweep, and according to
Obtain the real voltage V2 of the reflected signal of reflection power test point on the described standing wave detection circuit, according to described real voltage V2, obtain the reflection power Pr of reflection power test point on the described standing wave detection circuit;
C, according to described reflection power Pr and described output signal power Pt, obtain corresponding standing-wave ratio VSWR.
2. a standing wave ration detection device is characterized in that, this device comprises:
The reflected voltage detecting unit, be used at standing wave detection circuit, a tone signal is sent as the transmission signal that is used for the test standing-wave ratio, make described tone signal work in the frequency sweep state, and carrying out on each frequency of frequency sweep, the voltage V3 of reflection power test point on the standing wave detection circuit is detected; Wherein, the launching electrical level of described transmission signal on all frequencies is identical preset value X, the frequency point ranges of described frequency sweep is from f1 to f2, frequency sweep is spaced apart default spacing value f3, described f1 is the initial frequency of carrying out the working frequency range of the Wireless Telecom Equipment that standing-wave ratio detects, and described f2 is the cut-off frequency of the working frequency range of described Wireless Telecom Equipment;
The real voltage computing unit is used for the voltage V3 of detected all frequencies when carrying out described frequency sweep, selects maximum V3max and minimum value V3min, and according to
Obtain the real voltage V2 of the reflected signal of reflection power test point on the described standing wave detection circuit, according to described real voltage V2, obtain the reflection power Pr of reflection power test point on the described standing wave detection circuit;
Standing-wave ratio is calculated the unit, is used for according to described reflection power Pr and described output signal power Pt, obtains corresponding standing-wave ratio VSWR.
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Cited By (4)
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| CN103728502A (en) * | 2013-12-31 | 2014-04-16 | 华为终端有限公司 | Antenna test method and system and wireless terminal |
| CN104198824A (en) * | 2014-09-05 | 2014-12-10 | 中国科学院电子学研究所 | Measurement method for differential antenna |
| CN104243065A (en) * | 2014-09-01 | 2014-12-24 | 大唐移动通信设备有限公司 | Method and device for standing-wave ratio detection |
| CN104270208A (en) * | 2014-10-14 | 2015-01-07 | 大唐移动通信设备有限公司 | Method and device for detecting standing-wave ratio of RRU |
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| CN104270208A (en) * | 2014-10-14 | 2015-01-07 | 大唐移动通信设备有限公司 | Method and device for detecting standing-wave ratio of RRU |
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