CN101674141A - Method and device for detecting radio frequency feed line loss - Google Patents
Method and device for detecting radio frequency feed line loss Download PDFInfo
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- CN101674141A CN101674141A CN200810222238A CN200810222238A CN101674141A CN 101674141 A CN101674141 A CN 101674141A CN 200810222238 A CN200810222238 A CN 200810222238A CN 200810222238 A CN200810222238 A CN 200810222238A CN 101674141 A CN101674141 A CN 101674141A
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Abstract
The invention discloses method and device for detecting radio frequency feed line loss, which are mainly applied to the mobile communication filed. The detecting method of the invention comprises thefollowing steps: in a radio frequency remote unit RRU, switching a transmitting channel to a detecting channel to detecte the output power of the transmitting channel; in the RRU, switching the transmitting channel to a calibrating channel to calibrate the transmitting channel; and according to the detecting result and the calibrating result, calculating the radio frequency feed line loss betweenthe RRU and an antenna. The method and the device for detecting the radio frequency feed line loss organically combine the detection of the output power of the transmitting channel and the calibrationof the transmitting channel through a radio frequency switch, and effectively improve the detection accuracy of the radio frequency feed line loss.
Description
Technical field
The present invention relates to detect in a kind of moving communicating field the method and apparatus of radio frequency feed line loss, particularly a kind of method and apparatus that detects radio frequency feed line loss between RRU and antenna.
Background technology
As the TD-SCDMA technology of one of Global 3G mobile communication mainstream standard, beginning in 2008 tries commercialization on a large scale in 8 cities of China.Concerning the novel antenna-feedback system of TD-SCDMA, the cable loss between test RRU (Ridio Remote Unit, Remote Radio Unit) and antenna has very big influence to the coverage and the network optimization of base station.Need test out this loss with some means, and in system, compensate, to guarantee keeping a fixing power level at the descending power of antenna inlet.At present, make usually in two ways this loss measured:
Mode 1: at engineering site, adopt RF instrumentation that feeder line is measured, measure the cable loss, the line item of going forward side by side inputs to the base station by the debugging software window with this value then when opening the base station, after the base station obtains this value, compensate by specific program.Instrumentation is tested, though the ratio of precision of test is higher, but owing to be manually to test, just test value is carried out interim record, then blotter is handed to base station debugging and open personnel, incorrect posting and the situation of losing often appear in the centre, have had a strong impact on the efficient of opening base station; In case this loss of data and cable has installed will be tested again again, instrument need be moved to above the iron tower, very inconvenient.
Mode 2: carry out the detection of power output in the RRU side with the radio-frequency power wave detector, use the radio-frequency power wave detector to carry out input power at antenna side radio frequency feed line inlet and detect.Antenna sends detected input power value to RRU by specific transmission means, and the processor controls of RRU is by subtracting each other these two values, thereby calculates the loss of radio frequency feed line.This metering system is finished automatically by the base station in opening base station, has reduced the mistake that may bring owing to manually participate in, has improved the reliability of work; But need to use two wave detectors to detect respectively, the detection error of each wave detector be+/-1dB, the detection error that such two wave detectors brought then for+/-2dB, reduced the accuracy of detection; This mode also needs antenna to cooperate RRU to carry out the transmission of test data simultaneously, and needing increases agreement and hardware cost, has also increased the fault point of antenna side.
Summary of the invention
The purpose of this invention is to provide a kind of method and apparatus that detects radio frequency feed line loss, lose easily to solve in the prior art manual testing's data, test error problem of higher automatically.
In order to realize above purpose, the invention discloses a kind of method that detects radio frequency feed line loss, comprise the following steps: in radio frequency remote unit RRU, transmission channel to be switched to sense channel, the power output of transmission channel is detected; In radio frequency remote unit RRU, transmission channel is switched to calibrated channel, transmission channel is calibrated; According to testing result and calibration result, calculate the radio frequency feed line loss between RRU and antenna.
In the technique scheme, the transmission channel power output detected specifically comprise: radiofrequency signal is passed through circulator, the directional coupler of RRU successively, from the prevention at radio-frequency port output of RRU; Close out the part radiofrequency signal from the directional coupler lotus root, the receive path that enters RRU through radio-frequency (RF) switch detects.
In the technique scheme, transmission channel calibrated specifically comprise: radiofrequency signal is passed through circulator, the directional coupler of RRU successively, from the prevention at radio-frequency port output radiofrequency signal of RRU through the antenna coupling dish of radio frequency feed line to antenna inside; Close back the part radio-frequency power from the output of antenna coupling mouth by antenna coupling dish lotus root, after process radio frequency feed line and power close the branch device, pass through radio-frequency (RF) switch again, enter receive path and calibrate.
In the technique scheme, calculate the radio frequency feed line loss between RRU and antenna, for: D=(D4+D2-D1-D3)/2 wherein: D is a radio frequency feed line loss between RRU and antenna; D1 is the passive loss of antenna coupling dish; D2 is in the process that the transmission channel power output is detected, the loss from the directional coupler to the radio-frequency (RF) switch; D3 is in the process that transmission channel is calibrated, the loss from the antenna coupling mouth to radio-frequency (RF) switch; Twice process computing unit detection signal difference power that D4 detects and calibrates for the transmission channel power output.
In the technique scheme, the power output of transmission channel detected also comprise: the power output of transmission channel is carried out repeated detection average, obtain final radio frequency feed line loss value.
The present invention also provides a kind of device that detects radio frequency feed line loss, comprises RRU and antenna, also comprises radio-frequency (RF) switch and computing unit: radio-frequency (RF) switch, be used for the switching of control detection passage and calibrated channel, and realize the function of power detection and calibration; Computing unit is used for acquisition testing result and calibration result, calculates the radio frequency feed line loss between RRU and antenna.
In the technique scheme, sense channel comprises power amplifier unit, circulator, directional coupler and the radio-frequency (RF) switch of the RRU that is in turn connected to form a loop, power amplifier unit links to each other with the computing unit of RRU by the transmission channel of RRU, and radio-frequency (RF) switch links to each other with described computing unit by the receive path of RRU.
In the technique scheme, calibrated channel comprises that power amplifier unit, circulator, directional coupler, the power of the RRU that is in turn connected to form a loop close branch device and radio-frequency (RF) switch, power amplifier unit links to each other with the computing unit of RRU by the transmission channel of RRU, and radio-frequency (RF) switch links to each other with computing unit by the receive path of RRU.
The method and apparatus of detection radio frequency feed line loss of the present invention organically combines the detection of transmission channel power output and the calibration of transmission channel by radio-frequency (RF) switch, has avoided the inconvenience of manual detection; Reduce hardware circuit and agreement, simplified design, effectively improved the precision that radio frequency feed line loss detects.
Description of drawings
Fig. 1 is the method flow diagram that the present invention detects radio frequency feed line loss;
Fig. 2 is the device schematic diagram that the present invention detects radio frequency feed line loss.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
As depicted in figs. 1 and 2, the invention discloses a kind of method that detects radio frequency feed line loss, specifically may further comprise the steps:
Step S102, utilize radio-frequency (RF) switch that the transmission channel of RRU is switched to sense channel, when the power output of transmission channel is detected, with the circulator among the radiofrequency signal process RRU, again through the directional coupler among the RRU, from the prevention at radio-frequency port output of RRU, to close out a part of radiofrequency signal from the directional coupler lotus root and detect through the receive path that radio-frequency (RF) switch enters RRU, the flow process of signal in Fig. 2 is 4,5,1,3,6.
Step S104, utilize radio-frequency (RF) switch that the transmission channel of RRU is switched to calibrated channel, when transmission channel is calibrated, with radiofrequency signal process circulator, again through a directional coupler, prevention at radio-frequency port output radiofrequency signal process radio frequency feed line from RRU, close back a part of radio-frequency power closes dish from lotus root antenna coupling mouth output through the antenna coupling dish lotus root of antenna inside again, after process radio frequency feed line and power close the branch device, pass through radio-frequency (RF) switch again, enter receive path and calibrate, the flow process of signal in Fig. 2 is 4,5,2,3,6.
Step S106 according to the testing result of step S102 and the calibration result of step S104, calculates the radio frequency feed line loss between RRU and antenna.
In the specific embodiment of the present invention, the TD-SCDMA antenna-feedback system is the composition form of 8+1 transmission channel, can be successively respectively to wherein between 8 different transmission channels and antenna the loss of radio frequency feed line detect, the length of these 9 feeder lines is almost completely consistent during practical application, therefore can take multiple measurements identical or different transmission channel and draw radio frequency feed line loss mean value, obtain the radio frequency feed line loss of finally determining.
Derive the computing formula of radio frequency feed line loss as follows below:
Test condition: carry out signal at computing unit and initiate and input; The initial value of above-mentioned detection, calibration process computing unit is identical.
Parameter-definition is as follows:
Radio frequency feed line loss between RRU and the antenna element is D; The passive loss that lotus root is closed dish is D1; Directional coupler in the transmitting power sense channel is D2 to the loss of radio-frequency (RF) switch; The antenna coupling mouth is D3 to the loss of radio-frequency (RF) switch; Twice process computing unit detection signal difference power of above-mentioned power detection and calibration is D4.
Preferably, the computing formula of the radio frequency feed line loss between RRU and the antenna element: D=(D4+D2-D1-D3)/2
Below this computing formula is carried out simple error analysis:
Overall error is by the error decision of D1, D2, D3 and D4; As shown in Figure 2, transmitting power detection signal and transmission channel calibrating signal are all passed through path shown in the solid line, and in the process that detects and calibrate, the error of this section can be offset fully by subtracting each other.Because signal level detection is carried out in computing unit, so the error of D4 can be ignored; 5 paths by directional coupler to 3 are that passive lotus root is closed passage, and Insertion Loss is a fixed value, and different interchannel consistency is fine, the error of D2 is+and/-0.3; The error of D3 is mainly closed the decision of branch device by power, be generally+/-0.3; The error that dish is closed in the error decision that the error of D1 is closed dish by lotus root, lotus root generally+/-0.5;
Total error is+/-1.1, consider repeatedly to measure, and to average, error reduces half, for+/-0.55.
The method of detection radio frequency feed line loss disclosed by the invention, utilize the characteristics of the transceiver passage of RRU equipment self, by radio-frequency (RF) switch the detection of transmission channel power output and the calibration of transmission channel are organically combined, hardware circuit and agreement have been reduced, simplify design, effectively improved the precision that radio frequency feed line loss detects.
As shown in Figure 2, the invention also discloses a kind of device that detects radio frequency feed line loss, comprise RRU and antenna, RRU comprises radio-frequency (RF) switch and computing unit: radio-frequency (RF) switch, be used for the switching of control detection passage and calibrated channel, realize the function of power detection and calibration; Computing unit is used for acquisition testing result and calibration result, calculates the radio frequency feed line loss between RRU and antenna.
Sense channel comprises power amplifier unit, circulator, directional coupler and the radio-frequency (RF) switch of the RRU that is in turn connected to form a loop, the transmission channel of power amplifier unit by RRU links to each other with computing unit in the RRU, and the receive path that radio-frequency (RF) switch is passed through RRU links to each other with computing unit.
Calibrated channel comprises that the power amplifier unit, circulator, directional coupler, the power that belong to RRU close branch device and radio-frequency (RF) switch.Wherein, power amplifier unit, circulator, directional coupler form first path of calibrated channel, and first path, one end links to each other with computing unit by transmission channel, and the other end links to each other with the antenna coupling dish of antenna by radio frequency feed line; Power closes the alternate path of branch device, radio-frequency (RF) switch formation calibrated channel, and alternate path one end links to each other with computing unit by the receive path of RRU, and the other end links to each other with the antenna coupling dish by antenna coupling mouth, radio frequency feed line.
By above-mentioned description to sense channel and calibrated channel as can be seen, the shared transmission channel of sense channel and calibrated channel, power amplifier unit, circulator, directional coupler, radio-frequency (RF) switch and receive path are shown in solid line among Fig. 2.When sense channel was done the transmitting power detection, radiofrequency signal was closed out the part radiofrequency signal from the directional coupler lotus root and is entered radio-frequency (RF) switch, shown in long dotted line among Fig. 2 through directional coupler; When calibrated channel is done the transmission channel calibration, the radiofrequency signal of directional coupler output is through radio frequency feed line, enter the antenna coupling dish, antenna coupling dish lotus root is closed back the part radio-frequency power and exports from the antenna coupling mouth, after process radio frequency feed line and power close the branch device, enter radio-frequency (RF) switch, shown in short dash line among Fig. 2.
Wherein, the important device of sense channel and calibrated channel is a radio-frequency (RF) switch, by the switching that radio-frequency (RF) switch is come control detection passage and calibrated channel, realizes the function of power detection and calibration.
The device of radio frequency feed line loss between detection RRU disclosed by the invention and antenna, this device can independently be finished automatically by RRU, has reduced link cost, and accuracy of detection is improved.
More than disclosed only be several specific embodiment of the present invention, still, the present invention is not limited thereto, any those skilled in the art can think variation all should fall into protection scope of the present invention.
Claims (8)
1, a kind of method that detects radio frequency feed line loss is characterized in that, comprises the following steps:
In radio frequency remote unit RRU, transmission channel is switched to sense channel, the power output of described transmission channel is detected;
In RRU, transmission channel is switched to calibrated channel, described transmission channel is calibrated;
According to described testing result and calibration result, calculate the radio frequency feed line loss between described RRU and antenna.
According to the method for the described detection radio frequency feed line loss of claim 1, it is characterized in that 2, the described transmission channel power output is detected specifically comprises:
Radiofrequency signal is passed through circulator, the directional coupler of described RRU successively, from the prevention at radio-frequency port output of described RRU;
Close out the part radiofrequency signal from the directional coupler lotus root, the receive path that enters RRU through radio-frequency (RF) switch detects.
According to the method for the described detection radio frequency feed line loss of claim 1, it is characterized in that 3, described transmission channel is calibrated specifically comprises:
Radiofrequency signal is passed through circulator, the directional coupler of described RRU successively, from the prevention at radio-frequency port output radiofrequency signal of described RRU through the antenna coupling dish of radio frequency feed line to antenna inside;
Close back the part radio-frequency power from the output of antenna coupling mouth by described antenna coupling dish lotus root, after process radio frequency feed line and power close the branch device, pass through radio-frequency (RF) switch again, enter receive path and calibrate.
4, according to the method for claim 2 or 3 described detection radio frequency feed line loss, it is characterized in that, the radio frequency feed line loss between described calculating RRU and antenna, for:
D＝(D4+D2-D1-D3)/2
Wherein:
D is a radio frequency feed line loss between described RRU and antenna;
D1 is the passive loss of described antenna coupling dish;
D2 is in the described process that the transmission channel power output is detected, the loss from described directional coupler to described radio-frequency (RF) switch;
D3 is in the described process that transmission channel is calibrated, the loss from the antenna coupling mouth to described radio-frequency (RF) switch;
D4 is twice process computing unit detection signal difference power that described transmission channel power output detects and calibrates.
According to the method for any described detection radio frequency feed line loss in the claim 1 to 3, it is characterized in that 5, described power output to transmission channel detects also and comprises:
The power output of described transmission channel is carried out repeated detection average, obtain final radio frequency feed line loss value.
6, a kind of device that detects radio frequency feed line loss comprises RRU and antenna, it is characterized in that, described RRU comprises radio-frequency (RF) switch and computing unit:
Described radio-frequency (RF) switch is used for the switching of control detection passage and calibrated channel, realizes the function of power detection and calibration;
Described computing unit is used for acquisition testing result and calibration result, calculates the radio frequency feed line loss between RRU and antenna.
7, according to the device of the described detection radio frequency feed line loss of claim 6, it is characterized in that, described sense channel comprises power amplifier unit, circulator, directional coupler and the radio-frequency (RF) switch of the described RRU that is in turn connected to form a loop, described power amplifier unit links to each other with the computing unit of RRU by the transmission channel of RRU, and radio-frequency (RF) switch links to each other with described computing unit by the receive path of RRU.
8, according to the device of the described detection radio frequency feed line loss of claim 6, it is characterized in that, described calibrated channel comprises that power amplifier unit, circulator, directional coupler, the power of the described RRU that is in turn connected to form a loop close branch device and radio-frequency (RF) switch, described power amplifier unit links to each other with the computing unit of RRU by the transmission channel of RRU, and described radio-frequency (RF) switch links to each other with described computing unit by the receive path of RRU.
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| CN102123422A (en) * | 2011-03-21 | 2011-07-13 | 大唐移动通信设备有限公司 | Method and equipment for detecting fault in communication channel |
| CN102497223A (en) * | 2011-12-05 | 2012-06-13 | 北京北方烽火科技有限公司 | Method and device for calibrating time division-long term evolution (TD-LTE) antenna array |
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| US5548820A (en) * | 1994-07-26 | 1996-08-20 | Telefonaktiebolaget Lm Ericsson | Antenna and feeder cable tester |
| US6151482A (en) * | 1997-09-30 | 2000-11-21 | Telefonaktiebolaget Lm (Publ) | Operation and maintenance link for antenna equipment |
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| CN102123422B (en) * | 2011-03-21 | 2014-06-04 | 大唐移动通信设备有限公司 | Method and equipment for detecting fault in communication channel |
| CN102497223A (en) * | 2011-12-05 | 2012-06-13 | 北京北方烽火科技有限公司 | Method and device for calibrating time division-long term evolution (TD-LTE) antenna array |
| CN102497223B (en) * | 2011-12-05 | 2014-01-15 | 北京北方烽火科技有限公司 | Method and device for calibrating time division-long term evolution (TD-LTE) antenna array |
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| CN103944654A (en) * | 2014-04-10 | 2014-07-23 | 大唐移动通信设备有限公司 | Feeder compensation method and device |
| CN104535299A (en) * | 2014-12-16 | 2015-04-22 | 深圳市共进电子股份有限公司 | Line loss detecting method and device |
| CN111372306A (en) * | 2020-02-25 | 2020-07-03 | 中国电信股份有限公司 | Method for determining signal power, related device and computer readable storage medium |
| CN111372306B (en) * | 2020-02-25 | 2020-12-25 | 中国电信股份有限公司 | Method for determining signal power, related device and computer readable storage medium |
| CN113872705A (en) * | 2021-10-27 | 2021-12-31 | 上海移远通信技术股份有限公司 | Terminal test line loss detection method, device, system, terminal and medium |
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