CN1805415A - Apparatus and method of obtaining correction coefficient of receiver - Google Patents
Apparatus and method of obtaining correction coefficient of receiver Download PDFInfo
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- CN1805415A CN1805415A CN 200510002006 CN200510002006A CN1805415A CN 1805415 A CN1805415 A CN 1805415A CN 200510002006 CN200510002006 CN 200510002006 CN 200510002006 A CN200510002006 A CN 200510002006A CN 1805415 A CN1805415 A CN 1805415A
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- receiver
- noise source
- noise
- correction coefficient
- correction
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Abstract
The invention relates to a device for attaining the correct parameter of receiver, which comprises a receiver, a background computer and a noise resource. Wherein, one end of said noise source is connected to the input port of analogue channel of receiver, while another end is connected to the control unit of receiver to control the noise source; the background computer is connected to the control unit to send the correct request information of noise source while said information comprises the excess noise ratio information of noise source and the correct range of receiver. The invention also provides relative method which comprises: the background sends the correct request information of noise source to the receiver; the receiver controls the noise source and measures the correct parameter of receiver according to said correct request information. The invention uses the general noise source, to reduce the cost, improve the test accuracy and enlarge the test range.
Description
Technical field
The present invention relates to the network communications technology, relate in particular to a kind of apparatus and method that obtain correction coefficient of receiver.
Background technology
In Modern Communication System, people are more and more higher to the requirement of communication quality, thereby the signal strength measurement that receiver received is had very high required precision.Therefore, in order to guarantee that operation of receiver is at different channels, under the different gains situation, its received signal strength measurement can keep less error, usually the correction of receive path is being produced, is opening, all needed to carry out when safeguarding to receiver, promptly the parameter of receive path is proofreaied and correct, and wish to have higher correction accuracy, described correction parameter to generally include gain and noise factor.
Receiver need be known the noise factor and the gain data of reception itself when intensity is measured to the received signal, because receiver can be operated under the different frequency channel, also can be operated under the different gain situations.Under the different operating condition, the gain of receiver and noise factor are not invariable values, it need be through test one by one, and obtain a ideal value tables of data of certain departure is arranged with design, the tables of data of using these gains of testing acquisition and noise factor to form calculates the field intensity of received signal, thereby reduce measure error, improve the precision of calculating the received signal field intensity.
In the prior art, as shown in Figure 1, traditional receiver means for correcting comprises: the receiver that is corrected, need a radio-frequency signal source and a control background computer at least.Background computer goes receiver control and reads the signal that receiver reports by the receiver control interface, and background computer generally is gpib interface or Ethernet network interface by the radio-frequency signal source control interface simultaneously, and radio-frequency signal source is controlled.The action of collaborative radio-frequency signal source of background computer and receiver is proofreaied and correct the gain and the noise factor of receiver channel.
Yet, the coefficient of receiver channel is being tested in the trimming process, because the radiofrequency signal volume source is big, be not easy to carry, during the receiver that particularly is maintained in the base station to be installed, make test proofread and correct very trouble.In addition, because radio-frequency signal source costs an arm and a leg the use cost height.Connect more complicated during test, background computer is not only wanted receiver control, also needs to control radio-frequency signal source.
Summary of the invention
The objective of the invention is shortcoming at above-mentioned prior art, a kind of apparatus and method that obtain correction coefficient of receiver are provided, solved the inconvenience and the high problem of cost of prior art, thereby the testing cost of convenience, reduction is provided and has improved measuring accuracy for test.
The invention provides the device that a kind of receive path is proofreaied and correct, comprise receiver, background computer and noise source, described receiver also comprises receiver analog channel, digital receiver processing unit and receiver control unit, one end of described noise source links to each other with receiver analog channel input port, and the other end links to each other so that receiver is controlled noise source with the receiver control unit; Background computer links to each other with the receiver control unit, issues the correction request information of noise source for receiver.
The present invention also provides a kind of method that obtains correction coefficient of receiver, comprising:
A, background computer issue the correction request information of noise source to receiver;
B, receiver are controlled the state of noise source, the correction coefficient of measuring receiver according to correction request information.
Described correction coefficient comprises noise factor and yield value.
Described correction request information comprises the excess noise ratio information and the receiver correcting range of noise source.
Described step B further comprises:
B1, receiver are according to correction request information configuration working frequency points and receiving gain;
B2, by receipts machine control noise source, make it to be in cold conditions, and the signal strength signal intensity that receives of test;
B3, receiver control noise source, make it to be in hot, and the signal strength signal intensity that receives of test;
B4, receiver analyze the signal strength signal intensity that above-mentioned B2 and the test of B3 step obtain, and obtain correction coefficient.
Described step B4 obtains correction coefficient according to following formula:
T
2＝(T
s ON-Y
2T
s OFF)/(Y
2-1)
G＝N
2 ON/(K*B*(T
2 ON+T
2))
Wherein: T
2The noise factor of receiver
The gain of G receiver
T
s OFFTemperature during the cold conditions of noise source
T
s ONNoise temperature during noise source hot
Y
2＝N
2 ON/N
2 OFF＝T
2 ON/T
2 OFF＝(T
s ON+T
2)/(T
s OFF+T
2)
N
2 ONThe noise source of testing is in hot noise power
N
2 OFFThe noise source of testing is in the noise power of cold conditions
Y Y factor coefficient
The K Boltzmann constant
The B receiver receives bandwidth.
After step B4, also comprise:
B5, receiver judge whether to finish the correction test of all setting ranges, if, execution in step B6 then, otherwise, step B1 returned;
B6, receiver are handled the test data under all working frequency and the receiving gain, obtain receiver receive path correction data table.
Utilize the present invention, the present invention has adopted general noise source, because general noise source is long-pending small and exquisite, therefore, easy to use.In addition, because noise source price used in the present invention is low, thereby reduced the cost of testing.Owing to can carry out regular calibration to general noise source, because of it has retrospective precision; Therefore, concerning the correction of receive path, can obtain excellent precision.Because the noise source frequency coverage is wide, can adapt to the receiver of different communication frequency range, therefore, enlarged the scope of test.
Description of drawings
Fig. 1 shows the channel correction schematic representation of apparatus of prior art;
Fig. 2 illustrates the channel correction schematic representation of apparatus of embodiments of the invention;
Fig. 3 shows the flow chart of channel correction method of the present invention.
Embodiment
Understand and realization the present invention the existing embodiments of the invention of describing in conjunction with the accompanying drawings for the ease of persons skilled in the art.
In order to understand the present invention better, at first simply introduce correction principle of the present invention.
The present invention adopts Y factor method of testing well known to those skilled in the art, and by adding the noise signal of unlike signal intensity for twice, the signal strength signal intensity that receiver test receives is finished the test of noise factor and gain.
Now suppose noise source excess noise ratio (ENR) expression, ENR control information is provided by noise source, at T
0Effective under the=290K condition, and,
T
s OFFThe physical temperature of=noise source (being normally defined 290K),
T
s ONThe noise temperature of=noise source when " ON " state.Then
ENR
dB＝10log
10[(Ts
ON-Ts
OFF)/T
0]
Y
2＝N
2 ON/N
2 OFF＝T
2 ON/T
2 OFF＝(T
s ON+T
2)/(T
s OFF+T
2)
Wherein: the ON noise source is in hot
The OFF noise source is in cold conditions
N
2 ONThe noise power of testing (noise source is in the ON attitude)
N
2 OFFThe noise power of testing (noise source is in the OFF attitude)
Y Y factor coefficient
T
2The noise factor of receiver
T
s ONENR value by noise source calculates
T
s OFFThe physical temperature of noise source
Therefore, the noise factor of receiver is:
T
2＝(T
s ON-Y
2T
s OFF)/(Y
2-1)
The gain of receiver is:
G＝N
2 ON/(K*B*(T
2 ON+T
2))
K Boltzmann constant wherein
The B receiver receives bandwidth
According to the present invention, as shown in Figure 2, channel correction device of the present invention comprises receiver, noise source and background computer.Described receiver comprises receiver analog channel, digital receiver processing unit and receiver control unit.Noise source is a general noise source, for example, can be noise source general in the commercial apparatus, as 346 serial noise sources of Agilent company.The receiver control unit links to each other with noise source, is used for the control to general noise source.Background computer links to each other with receiver, and for receiver provides the scope of excess noise ratio information and correction, the control unit of receiver has built-in Control Software, can carry out correction program, finishes the correction of receiver automatically.
As shown in Figure 3, will introduce bearing calibration of the present invention below.
In step 1, background computer issues the excess noise ratio information of noise source and the scope of this correction to receiver;
In step 2, receiver configuration effort frequency and receiving gain;
In step 3, receiver control noise source makes it to be in cold conditions, the signal strength signal intensity that test receiver receives;
In step 4, receiver control noise source, make it to be in hot, the signal strength signal intensity that test receiver receives;
In step 5, the data analysis calculation that receiver obtains twice test obtains gaining and the actual value of noise factor;
In step 6, obtain the correction data of receiver channel under current working frequency and the gain condition;
In step 7, judge whether receiver finishes the correction test of all setting ranges, if finish, then execution in step 8, otherwise, execution in step 2;
In step 8, receiver is handled all test datas, obtains receiver receive path correction data table.
According to the present invention, utilize the built-in Control Software of receiver, replace the needed background computer of conventional method, simplified the demand of test condition.Use general noise source to replace radio-frequency signal source simultaneously, reduced volume and the cost of test with signal source.Because the control of noise source is very simple, for example (,) the control of 346A noise source only need to add one can switch control the 28V DC power supply get final product, it is also very simple that the use receiver is directly controlled general noise source.And the control of the radio-frequency signal source of conventional method is complicated, is not suitable for controlled function is accomplished in the receiver, must control with background computer, and the controlling party of collaborative simultaneously receiver of background computer and radio-frequency signal source can realize the correction of receiver.
Because general noise source volume is small and exquisite, such as the 346A noise source of Agilent company, the length and width height is about: 140*32*21mm, and therefore, easy to use.
In addition, because noise source price used in the present invention is not as good as 1/10th of radio-frequency signal source, so the present invention has reduced the cost of test.
In addition owing to can carry out regular calibration to general noise source, its its have a retrospective precision; Therefore, concerning the correction of receive path, can obtain excellent precision.
Because the noise source frequency coverage is wide, can adapt to the receiver of different communication frequency range, such as the 346A noise source of Agilent company, frequency covers 10MHz～18GHz.Therefore, enlarged the scope of test
Though described the present invention by embodiment, those of ordinary skills know, without departing from the spirit and substance in the present invention, just can make the present invention that many distortion and variation are arranged, and scope of the present invention is limited to the appended claims.
Claims (7)
1. the device proofreaied and correct of a receive path, it is characterized in that, comprise receiver, background computer and noise source, described receiver also comprises receiver analog channel, digital receiver processing unit and receiver control unit, one end of described noise source links to each other with receiver analog channel input port, and the other end links to each other so that receiver is controlled noise source with the receiver control unit; Background computer links to each other with the receiver control unit, issues the correction request information of noise source for receiver.
2. a method that obtains correction coefficient of receiver is characterized in that, comprising:
A, background computer issue the correction request information of noise source to receiver;
B, receiver are controlled the state of noise source, the correction coefficient of measuring receiver according to correction request information.
3. the method for acquisition correction coefficient of receiver according to claim 2 is characterized in that, described correction coefficient comprises noise factor and yield value.
4. the method for acquisition correction coefficient of receiver according to claim 2 is characterized in that, described correction request information comprises the excess noise ratio information and the receiver correcting range of noise source.
5. the method for acquisition correction coefficient of receiver according to claim 4 is characterized in that, described step B further comprises:
B1, receiver are according to correction request information configuration working frequency points and receiving gain;
B2, by receipts machine control noise source, make it to be in cold conditions, and the signal strength signal intensity that receives of test;
B3, receiver control noise source, make it to be in hot, and the signal strength signal intensity that receives of test;
B4, receiver analyze the signal strength signal intensity that above-mentioned B2 and the test of B3 step obtain, and obtain correction coefficient.
6. the method for acquisition correction coefficient of receiver according to claim 5 is characterized in that, described step B4 obtains correction coefficient according to following formula:
T
2＝(T
s ON-Y
2T
s OFF)/(Y
2-1)
G＝N
2 ON/(K*B*(T
2 ON+T
2))
Wherein: T
2The noise factor of receiver
The gain of G receiver
T
s OFFTemperature during the cold conditions of noise source
T
s ONNoise temperature during noise source hot
Y
2＝N
2 ON/N
2 OFF＝T
2 ON/T
2 OFF＝(T
s ON+T
2)/(T
s OFF+T
2)
N
2 ONThe noise source of testing is in hot noise power
N
2 OFFThe noise source of testing is in the noise power of cold conditions
Y Y factor coefficient
The K Boltzmann constant
The B receiver receives bandwidth.
7. the method for acquisition correction coefficient of receiver according to claim 5 is characterized in that, also comprises after step B4:
B5, receiver judge whether to finish the correction test of all setting ranges, if, execution in step B6 then, otherwise, step B1 returned;
B6, receiver are handled the test data under all working frequency and the receiving gain, obtain receiver receive path correction data table.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100020063A CN100544329C (en) | 2005-01-11 | 2005-01-11 | A kind of apparatus and method that obtain correction coefficient of receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100020063A CN100544329C (en) | 2005-01-11 | 2005-01-11 | A kind of apparatus and method that obtain correction coefficient of receiver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1805415A true CN1805415A (en) | 2006-07-19 |
| CN100544329C CN100544329C (en) | 2009-09-23 |
Family
ID=36867254
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100020063A Expired - Fee Related CN100544329C (en) | 2005-01-11 | 2005-01-11 | A kind of apparatus and method that obtain correction coefficient of receiver |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102221648A (en) * | 2011-03-03 | 2011-10-19 | 中国电子科技集团公司第十研究所 | Automatic calibrating device of K and Ka frequency range noise source |
| CN107340519A (en) * | 2017-07-02 | 2017-11-10 | 中国航空工业集团公司雷华电子技术研究所 | A kind of weather radar rainfall detecting analytic system and method |
| CN108802651A (en) * | 2018-06-08 | 2018-11-13 | 中国电子科技集团公司第四十研究所 | A kind of the on-line amending device and modification method of Noise Factor Analyzer temperature drift |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4742561A (en) * | 1985-09-10 | 1988-05-03 | Home Box Office, Inc. | Apparatus for generating signals useful for testing the sensitivity of microwave receiving equipment |
-
2005
- 2005-01-11 CN CNB2005100020063A patent/CN100544329C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102221648A (en) * | 2011-03-03 | 2011-10-19 | 中国电子科技集团公司第十研究所 | Automatic calibrating device of K and Ka frequency range noise source |
| CN107340519A (en) * | 2017-07-02 | 2017-11-10 | 中国航空工业集团公司雷华电子技术研究所 | A kind of weather radar rainfall detecting analytic system and method |
| CN107340519B (en) * | 2017-07-02 | 2021-02-19 | 中国航空工业集团公司雷华电子技术研究所 | Weather radar rainfall detection analysis system and method |
| CN108802651A (en) * | 2018-06-08 | 2018-11-13 | 中国电子科技集团公司第四十研究所 | A kind of the on-line amending device and modification method of Noise Factor Analyzer temperature drift |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100544329C (en) | 2009-09-23 |
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