CN101296469B - GSM signal frequency point detection method and device thereof - Google Patents
GSM signal frequency point detection method and device thereof Download PDFInfo
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- CN101296469B CN101296469B CN2008100675707A CN200810067570A CN101296469B CN 101296469 B CN101296469 B CN 101296469B CN 2008100675707 A CN2008100675707 A CN 2008100675707A CN 200810067570 A CN200810067570 A CN 200810067570A CN 101296469 B CN101296469 B CN 101296469B
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Abstract
The invention discloses a method for detecting GSM signal frequency points, which comprises the following steps: the frequency of a frequency generator is set by a control calculation unit in a stepping way based on a fixed offset within a set scanning frequency range, the GSM signal detected is mixed with the frequency signal of the generator when the frequency is changed for once, and then an intermediate frequency signal is generated and sent into an intermediate frequency filter for filtration; the insertion loss for once of the intermediate frequency filter is detected by a power detecting unit, all the obtained insertion loss values of the intermediate frequency filter are sequenced, a minimum insertion loss value and the frequency corresponding to the minimum insertion loss value are found out, and then the center frequency of the intermediate frequency filter is deducted from or added to the frequency corresponding to the minimum insertion loss value so as to obtain the frequency point of the GSM signal detected. The GSM signal is mixed with a variable frequency signal and the insertion loss of the intermediate frequency filter is skillfully used for detecting the frequency of the GSM signal, having no influence of the variation of the power of the GSM signal as time passes by, thereby guaranteeing the accuracy and speed of detection.
Description
Technical field
The invention belongs to the detection technique field of the signal frequency point of gsm communication system, particularly a kind of GSM signal frequency point detection method and checkout gear are applicable to quick, the accurately detection of BTS (base transceiver station) ancillary equipment to the input signal frequency.
Background technology
At present, mostly BTS ancillary equipment all is to obtain the frequency point information of its signal by communicating by letter with BTS, just need relate to physical interface and communication protocol and communicate by letter with BTS, makes the flexibility of ancillary equipment and compatibility be subjected to certain restriction, and the increase cost.
Along with the gsm communication technology rapid development, accurately and fast detecting of its signal frequency point is absolutely necessary.With the frequency signal mixing that GSM signal and changes, utilize the insertion loss of intermediate-frequency filter to detect the scheme of the frequency of GSM signal again, do not see that at present relevant document discloses.
Summary of the invention
In view of obtaining or above-mentioned defective that detection technique exists of existing gsm system intermediate-frequeney point, the invention provides a kind of detection method of GSM signal frequency point and the checkout gear of GSM signal frequency point, to realize quick, the accurately detection of GSM signal frequency point, satisfy the gsm communication system demand.
GSM signal frequency point detection method of the present invention may further comprise the steps:
A, in setting range of scanned frequencies, control computation unit is provided with the frequency of a frequency generator with step-by-step system by the constant offset amount, the frequency of a frequency generator of every change, with the frequency signal of tested GSM signal and frequency generator input mixing unit mixing, produce an intermediate-freuqncy signal and send into intermediate-frequency filter and carry out narrow-band filtering; And then by being connected in the Insertion Loss (promptly inserting loss) of forward and backward this intermediate-frequency filter of power detecting unit detection computations of this intermediate-frequency filter, and be recorded in the memory;
The frequency of wherein minimum Insertion Loss value and corresponding frequency generator thereof is found out in the Insertion Loss value ordering of b, a series of intermediate-frequency filters that step a is obtained, and this frequency deducts or add that the centre frequency of intermediate-frequency filter is the frequency of tested GSM signal.
Among the above-mentioned steps a, the lower frequency limit of the range of scanned frequencies of described setting is the centre frequency that first frequency of GSM adds intermediate-frequency filter, and upper limiting frequency is the centre frequency that last frequency of GSM adds intermediate-frequency filter.Among the step b, the frequency that the frequency of the frequency generator of described minimum Insertion Loss value correspondence deducts intermediate-frequency filter is the frequency of tested GSM signal.
Among the above-mentioned steps a, the lower frequency limit of the range of scanned frequencies of described setting also can deduct the centre frequency of intermediate-frequency filter for first frequency of GSM, and upper limiting frequency also can deduct the centre frequency of intermediate-frequency filter for last frequency of GSM.Among the step b, the frequency of the frequency generator of described minimum Insertion Loss value correspondence adds that the frequency of intermediate-frequency filter is the frequency of tested GSM signal.
When changing the frequency of frequency generator from low to high, at first, control computation unit control frequency generator generates the signal that frequency is described lower frequency limit, increases frequency according to the stepping of constant offset amount, till described upper limiting frequency.
When changing the frequency of frequency generator from high to low, at first, control computation unit control frequency generator generates the signal that frequency is described upper limiting frequency, reduces frequency according to the stepping of constant offset amount, till described lower frequency limit.
The constant offset amount that above-mentioned control computation unit changes the frequency of frequency generator is 200KHz.
In DCS1800M and EGSM900M frequency range, the GSM frequency interval is 200KHz, the three dB bandwidth of described intermediate-frequency filter can be designed to the frequency interval of 70-130%GSM, i.e. 140-260KHz, and the centre frequency of intermediate-frequency filter can be 180MHz, 211MHz, 240MHz or 336MHz etc.
Realize a kind of GSM signal frequency point checkout gear of said method, comprising:
One frequency generator is used to produce the frequency signal of single-tone;
One mixing unit, its input connects described frequency generator, with the GSM signal of input with from the monotony frequency signal mixing of described frequency generator, produces an intermediate-freuqncy signal;
One intermediate-frequency filter, described intermediate-frequency filter is a narrow band filter, is connected in described mixing unit output;
First, second two power detecting unit, both are connected to the input and the output of described intermediate-frequency filter; And,
One control computation unit, two inputs of this control computation unit connect described first respectively, the second power detecting unit output, control end connects described frequency generator, in the range of scanned frequencies of setting, press the frequency of constant offset amount with step-by-step system change frequency generator, the frequency of a frequency generator of every change, detect the Insertion Loss of an intermediate-frequency filter by described two power detecting unit, make the Insertion Loss value ordering of a series of intermediate-frequency filters of acquisition, find out the frequency of the frequency generator of wherein minimum Insertion Loss value and correspondence thereof, this frequency deducts or adds that the centre frequency of intermediate-frequency filter is the frequency of GSM signal.
The present invention is with a tested GSM signal and a frequency signal mixing that changes, utilize the insertion loss of intermediate-frequency filter to detect the frequency of GSM signal dexterously, be not subjected in testing process that the GSM signal power is time dependent to be influenced, guaranteed the accuracy and the speed that detect.
The present invention can be widely used in the existing BTS ancillary equipment, realizes the automatic fast detecting of the frequency point information of GSM signal, improves the flexibility and the compatibility of equipment greatly.
Description of drawings
Fig. 1 is the basic block diagram of GSM signal frequency point checkout gear of the present invention.
Embodiment
Below in conjunction with drawings and Examples the present invention is described in detail.
With reference to Fig. 1, GSM signal frequency point checkout gear comprises frequency generator, mixing unit, intermediate-frequency filter, first power detecting unit, second power detecting unit and control computation unit etc.
The frequency of frequency generator is regulated with step-by-step system by control computation unit.The GSM signal of input and frequency generator output connect an input of mixing unit respectively, GSM signal and produce intermediate-freuqncy signal through the mixing of mixing unit from the frequency signal of frequency generator.Intermediate-frequency filter is connected in described mixing unit output, and intermediate-frequency filter is a narrow band filter, and is inhibited for the signal of overcenter frequency certain limit.First power detecting unit is connected between intermediate-frequency filter input and the control computation unit, second power detecting unit is connected between intermediate-frequency filter output and the control computation unit, the performance number that control computation unit detects according to both is determined the insertion loss of intermediate-frequency filter, and then find out wherein minimum Insertion Loss value from the insertion loss value of a series of intermediate-frequency filters of obtaining, deduct or add that by the frequency of the frequency generator of this minimum Insertion Loss value correspondence the centre frequency of intermediate-frequency filter obtains the frequency of the GSM signal of input.
The lower frequency limit of above-mentioned setting range of scanned frequencies is the centre frequency that first frequency of GSM added or deducted intermediate-frequency filter, and upper limiting frequency is the centre frequency that last frequency of GSM added or deducted intermediate-frequency filter.
Described control computation unit changes the frequency of described frequency generator with the stepping of constant offset amount, and wherein the constant offset amount is 200KHz.
In DCS1800M and EGSM900M frequency range, the GSM frequency interval is 200KHz, the three dB bandwidth of described intermediate-frequency filter can be designed to the frequency interval of 70-130%GSM, i.e. 140-260KHz, and the centre frequency of intermediate-frequency filter can be 180MHz, 211MHz, 240MHz or 336MHz etc.
The detection of embodiment 1:DCS1800M downstream signal frequency
According to the gsm protocol requirement, first frequency of DCS1800M downstream signal is 1805.2MHz, and last frequency is 1879,8MHz, and other frequency is: 1805.2+N*0.2MHz, wherein N is the integer between the 1-374.Because the GSM frequency interval is 200KHz, so the three dB bandwidth of intermediate-frequency filter is designed to 200KHz or 250KHz, the centre frequency f of intermediate-frequency filter
InCan be designed as 180MHz, 240MHz etc., therein frequency of heart f
In± 200KHZ place requires to have certain inhibition index.Therefore,
The lower frequency limit of setting range of scanned frequencies is: 1805.2+f
In(MHz of unit)
The upper limiting frequency of setting range of scanned frequencies is: 1879.8+f
In(MHz of unit)
Testing process based on the DCS1800M downstream signal frequency of Fig. 1 device is as follows:
1), control computation unit changes the frequency of frequency generator from high to low, at first, it is that above-mentioned upper limiting frequency (is 1879.8MHz+f that control computation unit control frequency generator generates a frequency
InMHz) signal makes frequency generator reduce frequency according to constant offset amount 200KHz stepping, (is 1805.2MHz+f up to above-mentioned lower frequency limit
InMHz) till;
The frequency of a frequency generator of every change with the frequency signal input mixing unit mixing of tested GSM signal and the output of this frequency generator, produces an intermediate-freuqncy signal and sends into intermediate-frequency filter and carry out narrow-band filtering; And then by the forward and backward once insertion loss of this intermediate-frequency filter of power detecting unit detection computations of this intermediate-frequency filter, and be recorded in the memory;
2), control computation unit is carried out big minispread to the insertion loss value of all intermediate-frequency filters of noting, find out minimum insertion loss value, because the frequency of the frequency generator of the insertion loss value correspondence of this minimum is known, deducts the centre frequency f of intermediate-frequency filter with this frequency
InIt is exactly the frequency of GSM signal.
The detection of embodiment 2:EGSM900M downstream signal frequency
According to the gsm protocol requirement, first frequency of EGSM900M downstream signal is 925.2MHz, and last frequency is 959,8MHz, and other frequency is: 925.2+N*0.2MHZ, wherein N is the integer between the 1-174.Because the GSM frequency interval is 200KHZ, so the three dB bandwidth of our intermediate-frequency filter can be designed to 180KHz, 200KHz or 220KHz, the centre frequency f of intermediate-frequency filter
InCan be designed as 180MHz, 211MHz, 336MHz etc., therein frequency of heart f
In± 200KHz place requires to have certain inhibition index.Therefore,
The lower frequency limit of setting range of scanned frequencies is: 925.2+f
In(MHz of unit)
The upper limiting frequency of setting range of scanned frequencies is: 959.8+f
In(MHz of unit)
Below the testing process of the EGSM900M downstream signal frequency of embodiment 2:
1), control computation unit changes the frequency of frequency generator from low to high, at first, it is that above-mentioned lower frequency limit (is 925.2MHz+f that control computation unit control frequency generator generates a frequency
InMHz) signal makes frequency generator increase frequency according to constant offset amount 200KHz stepping, (is 959.8MHz+f up to above-mentioned upper limiting frequency
InMHz) till;
The frequency of a frequency generator of every change with the frequency signal input mixing unit mixing of tested GSM signal and the output of this frequency generator, produces an intermediate-freuqncy signal and sends into intermediate-frequency filter and carry out narrow-band filtering; And then by the forward and backward once insertion loss of this intermediate-frequency filter of power detecting unit detection of this intermediate-frequency filter, and be recorded in the memory;
2), control computation unit is carried out big minispread to the insertion loss value of all intermediate-frequency filters of noting, find out minimum insertion loss value, because the frequency of the frequency generator of the insertion loss value correspondence of this minimum is known, the centre frequency that deducts intermediate-frequency filter with this frequency is exactly the frequency of GSM signal.
Frequency mixer all adopts the up-conversion mode in the foregoing description 1,2, and it also is to realize of the present inventionly that frequency mixer adopts the down-conversion mode, followingly further specifies with embodiment 3.
The detection of embodiment 3:EGSM900M downstream signal frequency
According to the gsm protocol requirement, first frequency of EGSM900M downstream signal is 925.2MHz, and last frequency is 959,8MHz, and other frequency is: 925.2+N*0.2MHZ, wherein N is the integer between the 1-174.Because the GSM frequency interval is 200KHz, so the three dB bandwidth of our intermediate-frequency filter can be 200KHz or 140KHz etc., the centre frequency f of intermediate-frequency filter
InCan be designed as 180MHz, 211MHz, 336MHz etc., therein frequency of heart f
In± 200KHz place requires to have certain inhibition index.Because of the frequency mixer employing down-conversion mode of embodiment 3, therefore,
The lower frequency limit of setting range of scanned frequencies is: 925.2-f
In(MHz of unit)
The upper limiting frequency of setting range of scanned frequencies is: 959.8-f
In(MHz of unit)
Below the testing process of the EGSM900M downstream signal frequency of present embodiment:
1), control computation unit changes the frequency of frequency generator from low to high, at first, it is that above-mentioned lower frequency limit (is 925.2MHz-f that control computation unit control frequency generator generates a frequency
InMHz) signal makes frequency generator increase frequency according to constant offset amount 200KHZ stepping, (is 959.8MHz-f up to above-mentioned upper limiting frequency
InMHz) till;
The frequency of a frequency generator of every change with the frequency signal input mixing unit mixing of tested GSM signal and the output of this frequency generator, produces an intermediate-freuqncy signal and sends into intermediate-frequency filter and carry out narrow-band filtering; And then detect the insertion loss of this intermediate-frequency filter, and be recorded in the memory by the forward and backward power detecting unit of this intermediate-frequency filter;
2), control computation unit is carried out big minispread to the insertion loss value of all intermediate-frequency filters of noting, find out minimum insertion loss value, because the frequency of the frequency generator of the insertion loss value correspondence of this minimum is known, adds that with this frequency the centre frequency of intermediate-frequency filter is exactly the frequency of GSM signal.
In device provided by the invention and method, utilize the insertion loss of intermediate-frequency filter to detect the frequency of GSM signal cleverly, be not subjected in testing process like this that the GSM signal power is time dependent to be influenced, guaranteed the accuracy and the speed that detect.
Above-described only is better embodiment of the present invention, and it describes comparatively concrete and detailed, can not therefore be interpreted as the restriction to claim of the present invention.Should be understood that; for the person of ordinary skill of the art, without departing from the inventive concept of the premise, in the present invention program's scope; utilize the technology contents of above-mentioned announcement to make some changes or be modified to the equivalent embodiment of equivalent variations, these all belong to protection scope of the present invention.
Claims (10)
1. GSM signal frequency point detection method is characterized in that may further comprise the steps:
A, in setting range of scanned frequencies, control computation unit is pressed the constant offset amount changes a frequency generator with step-by-step system frequency, the frequency of a frequency generator of every change, with the frequency signal input mixing unit mixing of tested GSM signal and the output of this frequency generator, produce an intermediate-freuqncy signal and send into intermediate-frequency filter and carry out narrow-band filtering; And then detect the Insertion Loss of this intermediate-frequency filter, and be recorded in the memory by being connected in the forward and backward power detecting unit of this intermediate-frequency filter;
The frequency of wherein minimum Insertion Loss value and corresponding frequency generator thereof is found out in the Insertion Loss value ordering of b, a series of intermediate-frequency filters that step a is obtained, and this frequency deducts or add that the centre frequency of intermediate-frequency filter is the frequency of tested GSM signal.
2. GSM signal frequency point detection method as claimed in claim 1, it is characterized in that: among the step a, the lower frequency limit of described setting range of scanned frequencies is the centre frequency that first frequency of GSM adds intermediate-frequency filter, and upper limiting frequency is the centre frequency that last frequency of GSM adds intermediate-frequency filter; Among the step b, the frequency that the frequency of the frequency generator of described minimum Insertion Loss value correspondence deducts intermediate-frequency filter is the frequency of tested GSM signal.
3. GSM signal frequency point detection method as claimed in claim 1, it is characterized in that: among the step a, the lower frequency limit of described setting range of scanned frequencies is the centre frequency that first frequency of GSM deducts intermediate-frequency filter, and upper limiting frequency is the centre frequency that last frequency of GSM deducts intermediate-frequency filter; Among the step b, the frequency of the frequency generator of described minimum Insertion Loss value correspondence adds that the frequency of intermediate-frequency filter is the frequency of tested GSM signal.
4. as the GSM signal frequency point detection method of claim 2 or 3, it is characterized in that: when changing the frequency of frequency generator from low to high, at first, control computation unit control frequency generator generates the signal that frequency is described lower frequency limit, increase frequency according to the stepping of constant offset amount, till described upper limiting frequency.
5. as the GSM signal frequency point detection method of claim 2 or 3, it is characterized in that: when changing the frequency of frequency generator from high to low, at first, control computation unit control frequency generator generates the signal that frequency is described upper limiting frequency, reduce frequency according to the stepping of constant offset amount, till described lower frequency limit.
6. as the GSM signal frequency point detection method of claim 1 or 2 or 3, it is characterized in that: the constant offset amount that described control computation unit changes the frequency of frequency generator is 200KHz.
7. as the GSM signal frequency point detection method of claim 1 or 2 or 3, it is characterized in that: in DCS1800M and EGSM900M frequency range, the three dB bandwidth of described intermediate-frequency filter is the frequency interval of 70-130%GSM, and the centre frequency of intermediate-frequency filter is 180MHz, 211MHz, 240MHz or 336MHz.
8. realize the GSM signal frequency point checkout gear of each method of claim 1-7, it is characterized in that comprising:
One frequency generator is used to produce the frequency signal of single-tone;
One mixing unit, its input connects described frequency generator, with the GSM signal of input with from the monotony frequency signal mixing of described frequency generator, produces an intermediate-freuqncy signal;
One intermediate-frequency filter, described intermediate-frequency filter is a narrow band filter, is connected in described mixing unit output;
First, second two power detecting unit, both are connected to the input and the output of described intermediate-frequency filter; And,
One control computation unit, two inputs of this control computation unit connect described first respectively, the second power detecting unit output, control end connects described frequency generator, in setting range of scanned frequencies, press the frequency of constant offset amount with step-by-step system change frequency generator, the frequency of a frequency generator of every change, Insertion Loss by an intermediate-frequency filter of described two power detecting unit detection computations, make the Insertion Loss value ordering of a series of intermediate-frequency filters of acquisition, find out the frequency of the frequency generator of wherein minimum Insertion Loss value and correspondence thereof, this frequency deducts or adds that the centre frequency of intermediate-frequency filter is the frequency of the GSM signal of input.
9. GSM signal frequency point checkout gear as claimed in claim 8, it is characterized in that: the lower frequency limit of described setting range of scanned frequencies is the centre frequency that first frequency of GSM added or deducted intermediate-frequency filter, and upper limiting frequency is the centre frequency that last frequency of GSM added or deducted intermediate-frequency filter; Described control computation unit is with the frequency of the described frequency generator of constant offset amount 200KHz stepping the change.
10. as the GSM signal frequency point checkout gear of claim 8 or 9, it is characterized in that: in DCS1800M and EGSM900M frequency range, the three dB bandwidth of described intermediate-frequency filter is the frequency interval of 70-130%GSM, and the centre frequency of intermediate-frequency filter is 180MHz, 211MHz, 240MHz or 336MHz.
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| CN105743589A (en) * | 2016-04-06 | 2016-07-06 | 西安澳通电讯技术股份有限公司 | Online detection method for insertion losses and standing waves of radio frequency device and feeder |
| CN110113111A (en) * | 2019-05-07 | 2019-08-09 | 深圳市国人射频通信有限公司 | PDT/DMR signal frequency point detection method and its detection device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1514655A (en) * | 2002-12-31 | 2004-07-21 | 深圳市中兴通讯股份有限公司 | PHS system frequency point distribution method |
| CN1567796A (en) * | 2003-06-24 | 2005-01-19 | 华为技术有限公司 | A multi-user detecting method in CDMA communication system |
| CN101056453A (en) * | 2006-04-11 | 2007-10-17 | 中兴通讯股份有限公司 | Base station frequency point scanning and selection method of the radio city phone system |
| CN101150325A (en) * | 2006-09-19 | 2008-03-26 | 深圳市朗科科技有限公司 | Method for automatically searching best frequency modulation transmission frequency point |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1514655A (en) * | 2002-12-31 | 2004-07-21 | 深圳市中兴通讯股份有限公司 | PHS system frequency point distribution method |
| CN1567796A (en) * | 2003-06-24 | 2005-01-19 | 华为技术有限公司 | A multi-user detecting method in CDMA communication system |
| CN101056453A (en) * | 2006-04-11 | 2007-10-17 | 中兴通讯股份有限公司 | Base station frequency point scanning and selection method of the radio city phone system |
| CN101150325A (en) * | 2006-09-19 | 2008-03-26 | 深圳市朗科科技有限公司 | Method for automatically searching best frequency modulation transmission frequency point |
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