CN100391123C - Repeater for automatic testing of antenna isolation and test method thereof - Google Patents
Repeater for automatic testing of antenna isolation and test method thereof Download PDFInfo
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- CN100391123C CN100391123C CNB2004100340423A CN200410034042A CN100391123C CN 100391123 C CN100391123 C CN 100391123C CN B2004100340423 A CNB2004100340423 A CN B2004100340423A CN 200410034042 A CN200410034042 A CN 200410034042A CN 100391123 C CN100391123 C CN 100391123C
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- 238000002955 isolation Methods 0.000 title claims abstract description 52
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- 238000010998 test method Methods 0.000 title claims abstract description 5
- 238000001514 detection method Methods 0.000 claims abstract description 15
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 13
- 238000003786 synthesis reaction Methods 0.000 claims abstract description 13
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 9
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- 238000012545 processing Methods 0.000 description 4
- 238000010295 mobile communication Methods 0.000 description 3
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- 238000005516 engineering process Methods 0.000 description 2
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- 238000003199 nucleic acid amplification method Methods 0.000 description 2
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Abstract
The present invention discloses a repeater station for automatically testing antenna isolation degrees and a test method thereof. The repeater station comprises a donor antenna, a repeat antenna and a main link for connecting the donor antenna and the repeat antenna, wherein an auxiliary circuit for testing antenna isolation degrees is arranged on the main chain, the auxiliary circuit comprises a signal synthesis circuit and a signal detection circuit, the signal synthesis circuit is composed of a radio frequency switch and a programmable crystal circuit, and the signal detection circuit is composed of a power detection circuit and an analog-to-digital converter. Intermediate frequency signals which are provided by the signal synthesis circuit are changed into radio frequency (RF) transmitting signals through the frequency conversion of a frequency mixer at one side of the down link or the uplink main link, and the signals are sent out through the antenna during the isolation degree test. The transmitting signals are received by the antenna on the other side of the uplink or the down link main link, the received signals are sent to the signal detection circuit by the uplink or the down link main link, detected power levels are converted by the analog-to-digital converter, and the isolation degree test is completed. The present invention conveniently tests the isolation degrees between antennae by adding the simple auxiliary circuit.
Description
[technical field]
The present invention relates to the mobile communication technology field, relate to a kind of wireless transmission repeater of test antenna isolation automatically and the method for test antenna isolation thereof or rather.
[background technology]
Developing rapidly of mobile communication need be set up a large amount of base stations and be covered, but the overlay area of which kind of radio communication all can produce weak signal area or blind area; On the other hand, for some remote districts or the few area of number of users, it is higher to set up the base station cost, and infrastructure is also quite complicated.Be head it off, a kind of cost is lower, set up simple but have the small base station function equipment--arise at the historic moment in the repeater, and used on a large scale gradually, the repeater has become the cost-effective means that solve blind area, outlying mountain area's mobile communication at present.
The basic function of repeater is exactly a radiofrequency signal power intensifier.The repeater by donor antenna pickoff signals in existing overlay area,, is transmitted into the signal of filtering once more after power amplifier amplifies and treats the overlay area carrying out fabulous isolation with logical outer signal by band pass filter in down link.In up link, the signal of the mobile station terminal in the overlay area is transmitted into corresponding base station with same working method after by up amplification link processing, thereby reaches the signal transmission between base station and the terminal.It is isolation between donor antenna and the retransmitting antenna that the repeater provides strict restraining factors of Available Gain, and promptly donor antenna and retransmitting antenna are arbitrary is reflected to the signal attenuation degree of another one aerial signal output when the signal input is arranged.For guaranteeing the direct discharging station operate as normal, isolation between its donor antenna and the retransmitting antenna must be greater than the descending gain and the up gain of repeater, if isolate not enough, then cause link oscillation easily, may cause the repeater cisco unity malfunction, even cause obstruction to source base station, so donor antenna and retransmitting antenna isolation problem become the matter of utmost importance that the repeater project installation should be noted that.
The method of test antenna isolating level of direct amplifying station with antenna commonly used is to rely on signal source and frequency spectrograph test now, as shown in Figure 1 in the accompanying drawing, at first, be provided with signal source at the donor antenna oral-lateral, its input signal is Pin, and the signal that receives by frequency spectrograph at the retransmitting antenna mouth is Pout; In the step 2, frequency spectrograph is placed the donor antenna side, the signal P that donor antenna receives when measuring the signal source input signal and being Pin, then isolation between antennas can by calculating transmit and received signal between intensity difference obtain for (Pout-Pin)-(P-Pin), promptly isolation between antennas is Pout-P.Signal source can certainly be located at the retransmitting antenna side, utilize identical method test isolation.Although said method can comparatively accurately be tested the isolation between antennas of repeater, when need or safeguarding at commencement of works, it takes test instrumentation to engineering site, seem very inconvenient; On the other hand, frequency spectrograph belongs to comparatively expensive tester, adopts said method also to be unfavorable for the reduction of engineering cost from economic implications.
In order to address the above problem, Chinese invention patent application 02115593.3 has proposed a kind of method of automatic detection isolation, shown in Figure 2 as accompanying drawing, it is integrated into a detection module with signal source and spectrum analyzer, with this independently detection module be built in the repeater, realize the above-mentioned signal source and the basic test function of spectrum analyzer by this detection module.Above-mentioned patent application can realize detecting automatically the purpose of isolation, can make equipment management personnel monitor the isolation between antennas of repeater in real time.
In the above-mentioned patent application, from repeater primary link structure, it belongs to broad band repeater, being used for of its increase realizes that the detection module of isolation between antennas test compares more complex with its primary link, wherein the signal in the isolation between antennas detection module is synthetic finishes by frequency synthesizer, power detection in the isolation between antennas detection module, also more complicated.Compare with primary link, the antenna detection module has accounted for sizable component, and the cost in the engineering practical application is too big.
Therefore, the method for testing of antenna isolating level of direct amplifying station with antenna of the present invention is improved the method for testing of antenna isolating level of direct amplifying station with antenna and device at the characteristics of self, to overcome the deficiencies in the prior art.
[summary of the invention]
The objective of the invention is to increases easy auxiliary circuit and control circuit when the design repeater, thereby tests the isolation between repeater donor antenna and the retransmitting antenna rationally, easily.
For achieving the above object, technical solution of the present invention is such: the repeater of the automatic test antenna isolation of the present invention comprises donor antenna, retransmitting antenna and connects the primary link of donor antenna and retransmitting antenna, be provided with the auxiliary circuit that is used for testing donor antenna and retransmitting antenna isolation on primary link, this auxiliary circuit comprises signal synthesis circuit of being made up of radio-frequency (RF) switch and programmable crystal circuit and the signal deteching circuit of being made up of radio-frequency (RF) switch, power-sensing circuit and analog to digital converter.
The repeater is when the test antenna isolation according to the present invention, provide intermediate-freuqncy signal by signal synthesis circuit, this intermediate-freuqncy signal becomes RF to transmit by the frequency mixer frequency conversion of descending (or up) primary link one side to launch by antenna, and the antenna of up (or descending) primary link opposite side receives above-mentioned transmitting, this received signal reaches signal deteching circuit through up (or descending) primary link, detected power level is changed through analog to digital converter, be presented at the isolation between antennas result by control circuit control, finish the test of isolation between antennas.
Compared with prior art, the invention provides to increase when designing and be used to provide the synthetic auxiliary circuit with input of signal, not only reach the purpose of test antenna isolating level of direct amplifying station with antenna rationally, easily in the repeater; On the other hand, made full use of the partial circuit that itself exists in the primary link of repeater with signal deteching circuit, greatly reduced equipment cost, more possessed the value of practical application on the engineering because the signal that increases is synthetic.
[description of drawings]
Fig. 1 is a kind of isolation between antennas method of testing schematic diagram of existing repeater;
Fig. 2 is another existing antenna isolating level of direct amplifying station with antenna testing apparatus schematic diagram;
Fig. 3 A is general repeater down link design frame chart;
Fig. 3 B is general direct end uplink link design block diagram;
Fig. 4 A is a kind of design frame chart of the down link of repeater of the present invention;
Fig. 4 B is a kind of design frame chart of the up link of repeater of the present invention;
Fig. 5 A is another design frame chart of down link of repeater of the present invention;
Fig. 5 B is another design frame chart of up link of repeater of the present invention;
[embodiment]
The present invention mainly is used in the project installation of intra-frequency repeater or the test of the isolation between donor antenna and retransmitting antenna when safeguarding, by increasing simple auxiliary circuit and correspondent control circuits when the circuit design of repeater, relevant control and processing when finishing isolation degree test, thus a kind of method of testing antenna isolating level of direct amplifying station with antenna reasonably, easily is provided.
See also shown in Fig. 3 A, it has provided general repeater down link operation principle block diagram.The repeater receives base station signals by donor antenna 10, through duplexer 12 signal is sent into down link.After the 12 preliminary election filtering of downstream signal process duplexer, carrying out first order RF by low noise amplifier (LNA) 14 amplifies, filter 16 carries out first order RF filtering (being mirror image filtering), after this deliver to frequency mixer 18 and be mixed down intermediate-freuqncy signal with the local oscillation signal LO that Tx frequency synthesizer 46 produces, this intermediate-freuqncy signal is carried out first order intermediate frequency filtering through filter 20, amplifier 22 carries out first order intermediate frequency and amplifies, filter 24 carries out second level intermediate frequency filtering, amplifier 26 carries out second level intermediate frequency and amplifies, after this deliver to frequency mixer 28 again and be mixed down radiofrequency signal with the local oscillation signal LO that Tx frequency synthesizer 46 produces, this radiofrequency signal is carried out second level RF filtering through filter 30, after amplifier 32 carries out second level RF amplification (promptly drive and amplify), be amplified to certain transmitting power by power amplifier (PA) 34, deliver to retransmitting antenna 40 through duplexer 36, to area of coverage radiation.Wherein, the power supply of each active device is provided by power supply circuits 42, and related relevant control and demonstration are finished by LCD (LCD)+control circuit 44.
Fig. 3 B provides intra-frequency repeater up link design frame chart, retransmitting antenna 40 receives after the upward signal of portable terminal, this signal sends into up link and its processing mode and aforementioned down link in up link is basic identical, just the working band difference is not described in detail herein.
The present invention realizes testing automatically the isolation of 40 of donor antenna 10 and retransmitting antenna by increasing auxiliary circuit in the repeater, please consults Fig. 4 A and Fig. 4 B respectively.Signal when the auxiliary circuit that increases is used for respectively producing the isolation between antennas test synthesizes the purpose with input, comprise auxiliary circuit A and auxiliary circuit B, wherein auxiliary circuit A is made up of programmable crystal source circuit 52 and single-pole double throw RF switch (SPDT) 50, and the low-frequency signals (intermediate-freuqncy signal) that programmable crystal source 52 produces utilizes the frequency mixer 28 of primary link to produce radio frequency (RF) signal (being detailed later) that is suitable for retransmitting antenna 40 emissions by up-conversion; Auxiliary circuit B is provided with the single-pole double throw RF switch 60 identical with auxiliary circuit A equally, and in addition, it includes power-sensing circuit 62 and analog-to-digital conversion (ADC) circuit 64 is formed.
After having increased auxiliary circuit A and auxiliary circuit B, when testing the isolation of 40 of donor antenna 10 and retransmitting antenna, single-pole double throw RF switch 50 in the down link among the auxiliary circuit A with the radio frequency operation link switchover to programmable crystal source circuit 52 1 sides (be about to descending primary link disconnect), make the circuit of the intermediate frequency source signal of its generation through the switch rear end, promptly by amplifier 26 through frequency mixer 28 up-conversions, launch by retransmitting antenna 40 at last; Single-pole double throw RF switch 60 in the up link among the auxiliary circuit B with the radio frequency operation link switchover to power-sensing circuit 62 1 sides (be about to up primary link disconnect), transmitting of the retransmitting antenna 40 of switch front-end circuit after frequency mixer 18 down-converted received by donor antenna 10, send into power-sensing circuit 62 at last, result after the power detection converts digital signal to by analog to digital converter (ADC) 64, and this digital signal is presented on the LCD (LCD) by correspondent control circuits module 44.
More than having described repeater of the present invention has increased the principle of test antenna isolation behind auxiliary circuit A, the B, for operational convenience, when the Circuit Design of repeater, utilize above-mentioned principle can be aided with the corresponding control interfaces circuit usually, relevant control and processing when finishing isolation degree test; In addition, when writing repeater Operation and Maintenance Control Software, can be together with the control merger relevant with isolation degree test, submenu of independent one-tenth in the Control-Menu of repeater, for example can be referred to as the isolation engineering mode, so that the concrete operations of engineering site.
Below in conjunction with a specific embodiment, describe the method for testing of antenna isolating level of direct amplifying station with antenna of the present invention in detail.
1. the debugging of dispatching from the factory has increased the debugging in advance as follows before dispatching from the factory of the repeater behind the auxiliary circuit according to the present invention:
Step M, control circuit by the repeater switches to programmable crystal source circuit 52 1 sides with radio-frequency (RF) switch 50, being about to descending primary link disconnects, the intermediate-freuqncy signal that the circuit that makes the radio-frequency (RF) switch rear end produces programmable crystal source 52 is up-converted into RF through frequency mixer 28 and transmits, and makes its power output reach the rated output power of repeater by adjusting;
Step N, rate of doing work detection level conversion table (being the AD table).Add in retransmitting antenna 40 input ports of up link an input signal (40～-100dBm), control circuit by the repeater switches to power-sensing circuit 62 1 sides with radio-frequency (RF) switch 60, the every increase of input signal 1dB, control circuit control AD once sampling, make 61 grades power detection AD table one to one at last, rated output power according to the repeater down link calculates isolation between donor antenna 10 and the retransmitting antenna 40 again, shows intuitively by the LCD (LCD) that links to each other with control circuit 44.
For example, a rated output power is the intra-frequency repeater of 40dBm, if the signal that adds is-60dBm that then this moment, corresponding isolation was: 40dBm-(60dBm)=and 100dB, so can show directly that at LCD isolation is 100dB.
2 engineerings are used, and the engineering staff can finish the test of isolation by the isolation engineering mode Control-Menu of operation repeater, reads the isolation between donor antenna 10 and the retransmitting antenna 40 in LCD (LCD), and concrete grammar is as follows:
Step O, signal is synthetic.The control circuit that utilizes the repeater switches to the isolation engineering mode with the operating state of repeater, the radio-frequency (RF) switch 50 of down link switches to programmable crystal source circuit 52 1 sides, the radio-frequency (RF) switch 60 of up link is switched to power-sensing circuit 62 1 sides, the intermediate-freuqncy signal that the circuit of radio-frequency (RF) switch 50 rear ends of down link is produced programmable crystal source 52 is up-converted into RF through frequency mixer 28 and transmits, and is launched by retransmitting antenna 40;
Step P, power detection.Because the coupling in space, donor antenna 10 1 sides can receive the signal that retransmitting antenna 40 is sent in the above-mentioned steps 0, signal amplification, frequency conversion, amplification that the circuit of up link radio-frequency (RF) switch 60 front ends receives donor antenna 10 are again delivered to power-sensing circuit 62 and are detected;
Step Q, the result shows.Power-sensing circuit 62 detected power levels are by analog to digital converter 64 (AD) sampling among the step P, the AD table that step N obtains in the value that the AD sampling obtains and the debugging of dispatching from the factory compares from the greatest level to the minimum level successively, till equal or close, can read the isolation numerical value between donor antenna 10 and the retransmitting antenna 40 in LCD this moment (LCD), thereby finish the test of isolation between antennas.
In the above-described embodiments, the test of donor antenna 10 and 40 isolations of retransmitting antenna is finished by increase auxiliary circuit B (Fig. 4 B) in design auxiliary circuit A (Fig. 4 A) and the up link in the down link of repeater, when the purpose of this kind design is to avoid isolation degree test main equipment is formed interference, because this moment is the transmitting antenna during as isolation degree test with retransmitting antenna 40, its towards blind area then, zone for needing to cover; In addition, the power of descending power amplifier is bigger than up power amplifier power, when auxiliary circuit A designs in down link, can obtain the transmitting power of higher isolation degree test.But, those skilled in the art can obviously learn with reference to above-mentioned principle, auxiliary circuit A also can design in up link, auxiliary circuit B correspondingly is located in the down link, can also finish the isolation degree test of repeater donor antenna 10 and retransmitting antenna 40 based on identical principle this moment, and the circuit design block diagram sees also shown in Fig. 5 A and Fig. 5 B.
Adopt same principle with previous embodiment, during isolation degree test, shown in Fig. 5 A, single-pole double throw RF switch 50 in the up link among the auxiliary circuit A to programmable crystal source circuit 52 1 sides (being about to up primary link disconnects), makes the intermediate frequency source signal of its generation be launched by donor antenna 10 by the circuit up-conversion of switch rear end the radio frequency operation link switchover; In Fig. 5 B, single-pole double throw RF switch 60 in the down link among the auxiliary circuit B with the radio frequency operation link switchover to power-sensing circuit 62 1 sides (be about to descending primary link disconnect), transmitting of donor antenna 10 after the switch front-end circuit down-converted received by retransmitting antenna 40, carry out power-sensing circuit 62 at last, by converting digital signal to behind the analog to digital converter 64, again through behind the control circuit 44 result being presented on the LCD (LCD).
It should be noted, though described invention by above-mentioned embodiment, those of ordinary skills know, the present invention has many distortion or variation and does not break away from spirit of the present invention, any spirit according to invention, distortion that essence is done or change and all should be included among the accompanying Claim.
Claims (9)
1. the repeater of an automatic test antenna isolation, the primary link that comprises donor antenna, retransmitting antenna and connection donor antenna and retransmitting antenna, it is characterized in that: described primary link is provided with the auxiliary circuit that is used for testing donor antenna and retransmitting antenna isolation, and this auxiliary circuit comprises signal synthesis circuit of being made up of radio-frequency (RF) switch and programmable crystal source circuit and the signal deteching circuit of being made up of radio-frequency (RF) switch, power-sensing circuit and analog to digital converter.
2. the repeater of automatic test antenna isolation as claimed in claim 1, it is characterized in that: described primary link comprises that donor antenna receives the descending down link of retransmitting antenna side emission and the up up link that reaches the donor antenna side of terminal signaling that retransmitting antenna receives of reaching behind the wireless signal of base station, described signal synthesis circuit is located on the above-mentioned down link, and signal deteching circuit then is located on the up link.
3. the repeater of automatic test antenna isolation as claimed in claim 1, it is characterized in that: the primary link of described repeater comprises that donor antenna receives the descending down link of retransmitting antenna side emission and the up up link that reaches the donor antenna side of terminal signaling that retransmitting antenna receives of reaching behind the wireless signal of base station, described signal synthesis circuit is located on the above-mentioned up link, and signal deteching circuit then is located on the down link.
4. as the repeater of the described automatic test antenna isolation of one of claim 1 to 3, it is characterized in that: the primary link of described repeater is provided with control interface circuit, and the primary link of described repeater links to each other with described signal synthesis circuit and signal deteching circuit.
5. the method for testing of the isolation between antennas of a repeater as claimed in claim 1, it is characterized in that: this method comprises the steps:
Step O, the described signal synthesis circuit of being made up of radio-frequency (RF) switch and programmable crystal source circuit provides intermediate-freuqncy signal, and this intermediate-freuqncy signal is launched by the antenna of primary link one side through described primary link;
Step P, after the antenna reception of the signal of launching among the step O by the primary link opposite side, the signal of reception reaches the signal deteching circuit of being made up of radio-frequency (RF) switch, power-sensing circuit and analog to digital converter through primary link;
Step Q, the testing result of signal deteching circuit is handled through control circuit, finishes the test of isolation between antennas.
6. the method for test antenna isolation as claimed in claim 5, it is characterized in that: among the described step O, radio-frequency (RF) switch in the signal synthesis circuit switches to signal synthesis circuit one side, and the intermediate-freuqncy signal that the circuit of radio-frequency (RF) switch rear end produces the programmable crystal circuit in the primary link becomes to transmit through the primary link frequency conversion and launched by the antenna of primary link one side.
7. the method for test antenna isolation as claimed in claim 6, it is characterized in that: among the described step P, because the coupling in space, the antenna of primary link opposite side receives transmitting among the described step O, this signal is delivered to power-sensing circuit by the switching of the radio-frequency (RF) switch in the signal deteching circuit and is detected behind primary link.
8. the method for test antenna isolation as claimed in claim 7 is characterized in that: described method of testing further comprises the debugging step of repeater, and this debugging step comprises:
Step M, the radio-frequency (RF) switch of signal synthesis circuit switches to programmable crystal circuit one side, and the intermediate-freuqncy signal that the programmable crystal circuit produces for transmitting, makes its power output reach the rated output power of repeater by adjusting through the primary link frequency conversion;
Step N, rate of doing work detection level conversion table AD is at input signal of antenna adding of primary link opposite side, the radio-frequency (RF) switch of signal deteching circuit switches to power-sensing circuit one side, 1 unit of the every increase of input signal, control circuit control analog to digital converter once sampling is finished the AD table.
9. the method for test antenna isolation as claimed in claim 8, it is characterized in that: described step Q comprises: the detected power level of the power-sensing circuit among the step P is sampled by analog to digital converter, the AD table that step N obtains in value that the analog to digital converter sampling obtains and the debugging step compares from the greatest level to the minimum level successively, till equal or close, thereby obtain isolation between antennas numerical value.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2004100340423A CN100391123C (en) | 2004-04-23 | 2004-04-23 | Repeater for automatic testing of antenna isolation and test method thereof |
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| CNB2004100340423A CN100391123C (en) | 2004-04-23 | 2004-04-23 | Repeater for automatic testing of antenna isolation and test method thereof |
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| CN100391123C true CN100391123C (en) | 2008-05-28 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101615958B (en) * | 2008-06-27 | 2012-07-18 | 京信通信系统（中国）有限公司 | Method for detecting isolation between antennas for digital radio repeater system |
| CN102478620B (en) * | 2010-11-25 | 2013-09-11 | 上海华虹Nec电子有限公司 | Method for characterizing radio frequency isolation in radio frequency process |
| CN102547828B (en) * | 2010-12-31 | 2016-04-27 | 中国移动通信集团江苏有限公司 | A kind of device and method testing mobile communication network performance |
| CN102761382A (en) * | 2012-06-07 | 2012-10-31 | 哈尔滨海能达科技有限公司 | Method, system and correlated device for determining isolation between antennae |
| TWI601388B (en) * | 2016-11-17 | 2017-10-01 | 翌勤通訊股份有限公司 | Symmetric repeater and method for measuring antenna isolation |
| CN111148141B (en) * | 2019-12-27 | 2023-05-16 | 京信网络系统股份有限公司 | LTE base station, LTE base station testing system and LTE base station testing method |
| CN113238100B (en) * | 2021-04-23 | 2022-07-19 | 南京熊猫汉达科技有限公司 | Antenna testing device and method based on satellite communication antenna back lobe signal |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1283008A (en) * | 1999-07-29 | 2001-02-07 | 厦门华侨电子企业有限公司 | Direct amplifying station for mobile communication at 350 MH2 band and its antenna installation method |
| CN1368828A (en) * | 2002-03-12 | 2002-09-11 | 武汉邮电科学研究院 | Automatic measuring technique for antenna isolating level of direct amplifying station with antenna transmission |
| JP2003110354A (en) * | 2001-09-27 | 2003-04-11 | Furukawa Electric Co Ltd:The | Relay station, and transmitting and receiving antennas used for the same relay station |
| US20030153316A1 (en) * | 2002-02-12 | 2003-08-14 | Noll John R. | Method for improving RF spectrum efficiency with repeater backhauls |
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2004
- 2004-04-23 CN CNB2004100340423A patent/CN100391123C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1283008A (en) * | 1999-07-29 | 2001-02-07 | 厦门华侨电子企业有限公司 | Direct amplifying station for mobile communication at 350 MH2 band and its antenna installation method |
| JP2003110354A (en) * | 2001-09-27 | 2003-04-11 | Furukawa Electric Co Ltd:The | Relay station, and transmitting and receiving antennas used for the same relay station |
| US20030153316A1 (en) * | 2002-02-12 | 2003-08-14 | Noll John R. | Method for improving RF spectrum efficiency with repeater backhauls |
| CN1368828A (en) * | 2002-03-12 | 2002-09-11 | 武汉邮电科学研究院 | Automatic measuring technique for antenna isolating level of direct amplifying station with antenna transmission |
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