CN103297154B - Method and device for detecting standing-wave ratio - Google Patents
Method and device for detecting standing-wave ratio Download PDFInfo
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- CN103297154B CN103297154B CN201210048496.0A CN201210048496A CN103297154B CN 103297154 B CN103297154 B CN 103297154B CN 201210048496 A CN201210048496 A CN 201210048496A CN 103297154 B CN103297154 B CN 103297154B
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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 (SWR) detection technique.
Background technology
At present, conventional standing-wave ratio (SWR) testing circuit generally adopts circulator or directional coupler to be separated with transmitting by reflected signal.For circulator, work block diagram as shown in Figure 1.Particularly, standing-wave ratio detecting method is: obtain output signal power Pt according to the power of output power check point, obtains reflection signal power Pr according to the power of reflective power check point, according to obtained output signal power Pt and reflection signal power Pr, according to
obtain reflection coefficient Γ, finally, according to
the standing-wave ratio (SWR) VSWR of load can be obtained.
Known from the basic functional principle that above-mentioned conventional standing-wave ratio (SWR) detects, higher standing-wave ratio (SWR) accuracy of detection be expected, real reflection signal power must can be detected.But in actual applications, there is leakage signal problem (as shown in Figure 2) in circulator 1 mouthful to 3 mouthfuls meeting, will cause like this: the signal that reflective power check point detects be actually the upper output signal revealed of reflected signal and circulator 3 mouthfuls with.If very well (can cause reflected signal too small), the power that reflective power check point detects accurately can not reflect the power of reflected signal for circulator isolation poor (can cause leakage signal larger) or load standing-wave ratio (SWR).This just causes final standing-wave ratio (SWR) accuracy of detection poor.Therefore standing-wave ratio (SWR) accuracy of detection depends on the isolation of circulator.
As can be seen here, in actual applications owing to relying on the isolation of circulator, existing standing-wave ratio detecting method is made to there is the problem of accuracy of detection difference.
Summary of the invention
In view of this, fundamental purpose of the present invention is to provide a kind of standing-wave ratio detecting method and device, can improve standing-wave ratio (SWR) accuracy of detection.
In order to achieve the above object, the technical scheme that the present invention proposes is:
A kind of standing-wave ratio detecting method, the method comprises the following steps:
On standing wave detection circuit, a tone signal is sent as the transmission signal being used for testing standing-wave ratio (SWR), make described tone signal work in frequency sweep state, and on each frequency carrying out frequency sweep, the voltage V3 of reflective power check point on 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, sweep interval is default spacing value f3, described f1 is the initial frequency of the working frequency range of the Wireless Telecom Equipment carrying out standing-wave ratio (SWR) detection, and described f2 is the cutoff frequency of the working frequency range of described Wireless Telecom Equipment;
B, from the voltage V3 of all frequencies detected when carrying out described frequency sweep, select maximal value V3max and minimum value V3min, and according to
obtain the real voltage V2 of the reflected signal of reflective power check point on described standing wave detection circuit, according to described real voltage V2, obtain the reflective power Pr of reflective power check point on described standing wave detection circuit;
C, according to described reflective power Pr and described output signal power Pt, obtain corresponding standing-wave ratio (SWR) VSWR.
A kind of standing wave ration detection device, this device comprises:
Reflected voltage detecting unit, for at standing wave detection circuit, a tone signal is sent as the transmission signal being used for testing standing-wave ratio (SWR), described tone signal is made to work in frequency sweep state, and on each frequency carrying out frequency sweep, the voltage V3 of reflective power check point on 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, sweep interval is default spacing value f3, described f1 is the initial frequency of the working frequency range of the Wireless Telecom Equipment carrying out standing-wave ratio (SWR) detection, and described f2 is the cutoff frequency of the working frequency range of described Wireless Telecom Equipment;
Real voltage computing unit, in the voltage V3 from all frequencies detected when carrying out described frequency sweep, selects maximal value V3max and minimum value V3min, and according to
obtain the real voltage V2 of the reflected signal of reflective power check point on described standing wave detection circuit, according to described real voltage V2, obtain the reflective power Pr of reflective power check point on described standing wave detection circuit;
Standing-wave ratio (SWR) computing unit, for according to described reflective power Pr and described output signal power Pt, obtains corresponding standing-wave ratio (SWR) VSWR.
In sum, the standing-wave ratio detecting method that the present invention proposes and device, according to
obtain the real voltage V2 of the reflected signal of reflective power check point; according to this real voltage and then the power P r obtaining reflected signal; the output signal do not revealed by circulator due to this power affects, therefore, it is possible to guarantee the precision of the standing-wave ratio (SWR) detected value obtained based on this power P r.
Accompanying drawing explanation
Fig. 1 is conventional standing-wave ratio (SWR) testing circuit schematic diagram;
Fig. 2 is the output signal leakage schematic diagram in conventional standing-wave ratio (SWR) testing circuit;
Fig. 3 is the standing-wave ratio detecting method process flow diagram of the embodiment of the present invention one;
Fig. 4 is the standing wave ration detection device structural representation of the embodiment of the present invention one.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, the present invention is described in further detail below in conjunction with the accompanying drawings and the specific embodiments.
First, the principle that realizes of the present invention is described:
Suppose that signal (hereinafter referred to as " the leakage signal ") voltage amplitude that power amplifier output signal is leaked to reflective power check point through circulator is V1, reflected signal is V2 at the voltage amplitude of reflective power check point, and the voltage amplitude after each signal syntheses of reflective power check point is V3.
If the phase place of 1 V1 is identical with the phase place of V2, now the voltage V3 of reflective power check point is maximal value V3max, and: V3max=V2+V1---------------is 1.
If the phase place of 2 V1 is contrary with the phase place of V2, now the voltage V3 of reflective power check point is 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 is added with 2. formula, can obtain V3max+V3min=2*V2, therefore
Can obtain the real voltage amplitude of reflected signal at reflective power check point by V3max and V3min, magnitude of voltage can calculate real reflection signal power thus.Can see from above-mentioned analysis, the computation process of above-mentioned real reflection signal power has been broken away from and has been relied on the isolation of circulator.
Based on above-mentioned principle, core concept of the present invention is: use frequency sweep method, obtains maximum voltage and the minimum voltage of reflective power check point, and then obtains real reflection signal power according to both, thus can obtain standing-wave ratio (SWR) detected value accurately.
Fig. 3 is the method flow diagram of the embodiment of the present invention one, and as shown in Figure 3, this standing-wave ratio detecting method comprises the following steps:
Step 301, on standing wave detection circuit, a tone signal is sent as the transmission signal being used for testing standing-wave ratio (SWR), make described tone signal work in frequency sweep state, and on each frequency carrying out frequency sweep, the voltage V3 of reflective power check point on 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, sweep interval is default spacing value f3, described f1 is the initial frequency of the working frequency range of the Wireless Telecom Equipment carrying out standing-wave ratio (SWR) detection, and described f2 is the cutoff frequency of the working frequency range of described Wireless Telecom Equipment.
Here it should be noted that, in frequency sweep process, only need to guarantee that the launching electrical level of described transmission signal on all frequency sweep frequencies is identical, and output signal power Pt on all frequency sweep frequencies is identical, concrete X value only needs in the working range of Wireless Telecom Equipment of carrying out standing-wave ratio (SWR) detection.Like this, when power amplifier phase of output signal is constant, due to the phase shift effect of transmission path upper filter, the phase place of each frequency reflected signal can be different, and the signal that causes reflective power check point to detect (leakage signal and reflected signal and) voltage can change along with the change of test frequency.Usually, to I haven't seen you for ages change 360 degree in the process that reflected signal phase place travels through at frequency, within the scope of 360 degree, always there will be a V3max and V3min, real reflection signal power and standing-wave ratio (SWR) can be calculated accordingly.
In actual applications, sweep interval is the smaller the better, because sweep interval is less, V3max and the V3min error obtained is less, it is also more accurate that standing-wave ratio (SWR) calculates, but the test point of correspondence increases the test duration can be caused elongated, during specific implementation, those skilled in the art can arrange suitable sweep interval value according to actual needs based on above-mentioned rule.
Step 302, from the voltage V3 of all frequencies detected when carrying out described frequency sweep, select maximal value V3max and minimum value V3min, and according to
obtain the real voltage V2 of the reflected signal of reflective power check point on described standing wave detection circuit, according to described real voltage V2, obtain the reflective power Pr of reflective power check point on described standing wave detection circuit.
Here, acquisition due to reflective power Pr obtains based on the real voltage V2 of the reflected signal of reflective power check point, and therefore, the output signal that this reflective power Pr does not reveal by circulator affects, be accurately, thus the accuracy calculating standing-wave ratio (SWR) in subsequent step based on this can be guaranteed.
Particularly, obtain reflective power Pr according to described real voltage V2, those skilled in the art can adopt existing method to realize, and do not repeat them here.
Step 303, according to described reflective power Pr and described output signal power Pt, obtain corresponding standing-wave ratio (SWR) VSWR.
In this step, obtain standing-wave ratio (SWR) VSWR according to described reflective power Pr and described output signal power Pt, those skilled in the art can adopt existing method to realize, and 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:
Reflected voltage detecting unit, for at standing wave detection circuit, a tone signal is sent as the transmission signal being used for testing standing-wave ratio (SWR), described tone signal is made to work in frequency sweep state, and on each frequency carrying out frequency sweep, the voltage V3 of reflective power check point on 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, sweep interval is default spacing value f3, described f1 is the initial frequency of the working frequency range of the Wireless Telecom Equipment carrying out standing-wave ratio (SWR) detection, and described f2 is the cutoff frequency of the working frequency range of described Wireless Telecom Equipment.
Real voltage computing unit, in the voltage V3 from all frequencies detected when carrying out described frequency sweep, selects maximal value V3max and minimum value V3min, and according to
obtain the real voltage V2 of the reflected signal of reflective power check point on described standing wave detection circuit, according to described real voltage V2, obtain the reflective power Pr of reflective power check point on described standing wave detection circuit.
Standing-wave ratio (SWR) computing unit, for according to described reflective power Pr and described output signal power Pt, obtains corresponding standing-wave ratio (SWR) VSWR.
In sum, these are only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any amendment done, equivalent 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, the method comprises the following steps:
A, on standing wave detection circuit, a tone signal is sent as the transmission signal being used for testing standing-wave ratio (SWR), make described tone signal work in frequency sweep state, and on each frequency carrying out frequency sweep, the voltage V3 of reflective power check point on 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, sweep interval is default spacing value f3, described f1 is the initial frequency of the working frequency range of the Wireless Telecom Equipment carrying out standing-wave ratio (SWR) detection, and described f2 is the cutoff frequency of the working frequency range of described Wireless Telecom Equipment;
B, from the voltage V3 of all frequencies detected when carrying out described frequency sweep, select maximal value V3max and minimum value V3min, and according to
obtain the real voltage V2 of the reflected signal of reflective power check point on described standing wave detection circuit, according to described real voltage V2, obtain the reflective power Pr of reflective power check point on described standing wave detection circuit;
C, according to described reflective power Pr and output signal power Pt, obtain corresponding standing-wave ratio (SWR) VSWR.
2. a standing wave ration detection device, is characterized in that, this device comprises:
Reflected voltage detecting unit, for at standing wave detection circuit, a tone signal is sent as the transmission signal being used for testing standing-wave ratio (SWR), described tone signal is made to work in frequency sweep state, and on each frequency carrying out frequency sweep, the voltage V3 of reflective power check point on 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, sweep interval is default spacing value f3, described f1 is the initial frequency of the working frequency range of the Wireless Telecom Equipment carrying out standing-wave ratio (SWR) detection, and described f2 is the cutoff frequency of the working frequency range of described Wireless Telecom Equipment;
Real voltage computing unit, in the voltage V3 from all frequencies detected when carrying out described frequency sweep, selects maximal value V3max and minimum value V3min, and according to
obtain the real voltage V2 of the reflected signal of reflective power check point on described standing wave detection circuit, according to described real voltage V2, obtain the reflective power Pr of reflective power check point on described standing wave detection circuit;
Standing-wave ratio (SWR) computing unit, for according to described reflective power Pr and output signal power Pt, obtains corresponding standing-wave ratio (SWR) VSWR.
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| CN103728502B (en) * | 2013-12-31 | 2017-12-22 | 华为终端（东莞）有限公司 | The method and system and wireless terminal of a kind of antenna measurement |
| CN104243065B (en) * | 2014-09-01 | 2017-07-04 | 大唐移动通信设备有限公司 | The method and apparatus of standing-wave ratio detection |
| CN104198824B (en) * | 2014-09-05 | 2017-05-03 | 中国科学院电子学研究所 | Measurement method for differential antenna |
| CN104270208B (en) * | 2014-10-14 | 2017-01-11 | 大唐移动通信设备有限公司 | Method and device for detecting standing-wave ratio of RRU |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1435522A1 (en) * | 2002-12-30 | 2004-07-07 | Evolium S.A.S. | Measurement of Voltage Standing Wave Ratio with error compensation |
| CN101132240A (en) * | 2007-09-28 | 2008-02-27 | 摩比天线技术（深圳）有限公司 | Standing wave detecting device and method thereof |
| WO2010104308A3 (en) * | 2009-03-09 | 2010-11-25 | Lg Innotek Co., Ltd. | Radio frequency identification transmitting and receiving device |
| CN102307363A (en) * | 2011-09-09 | 2012-01-04 | 京信通信系统（中国）有限公司 | Standing wave detection method and apparatus thereof and base station system |
| CN102325339A (en) * | 2011-07-22 | 2012-01-18 | 京信通信系统（中国）有限公司 | Standing wave detection method and device and radio remote unit |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1435522A1 (en) * | 2002-12-30 | 2004-07-07 | Evolium S.A.S. | Measurement of Voltage Standing Wave Ratio with error compensation |
| CN1512691A (en) * | 2002-12-30 | 2004-07-14 | ��������ķ������ | VSWR measurement with error compensation |
| CN101132240A (en) * | 2007-09-28 | 2008-02-27 | 摩比天线技术（深圳）有限公司 | Standing wave detecting device and method thereof |
| WO2010104308A3 (en) * | 2009-03-09 | 2010-11-25 | Lg Innotek Co., Ltd. | Radio frequency identification transmitting and receiving device |
| CN102325339A (en) * | 2011-07-22 | 2012-01-18 | 京信通信系统（中国）有限公司 | Standing wave detection method and device and radio remote unit |
| CN102307363A (en) * | 2011-09-09 | 2012-01-04 | 京信通信系统（中国）有限公司 | Standing wave detection method and apparatus thereof and base station system |
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