CN107182282B - A kind of multi-channel radio frequency front end method for correcting phase - Google Patents
A kind of multi-channel radio frequency front end method for correcting phaseInfo
- Publication number
- CN107182282B CN107182282B CN201110015627.0A CN201110015627A CN107182282B CN 107182282 B CN107182282 B CN 107182282B CN 201110015627 A CN201110015627 A CN 201110015627A CN 107182282 B CN107182282 B CN 107182282B
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- 238000005070 sampling Methods 0.000 claims description 15
- 239000000969 carrier Substances 0.000 claims description 3
- 230000018109 developmental process Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 abstract description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000000149 penetrating Effects 0.000 description 1
Abstract
The invention belongs to air-fired missile road radio-frequency front-end phasing field, it is related to a kind of multi-channel radio frequency front end method for correcting phase.It is related to the system that an analog-digital converter (A/D) and a fpga chip by several radio-frequency channels and respective numbers is constituted, the radio-frequency channel is connected with analog-digital converter respectively, and the analog-digital converter other end is connected with FPGA respectively.Methods described uses an one-to-two power splitter and two same specification RF cable cables 1 and cable 2, and the absolute phase difference of each passage is drawn respectively, phase compensation is then carried out.The present invention need not write the software receiver of complexity, in the case of expensive vector network analyzer, it is only necessary to an one-to-two power splitter and write simple down coversion program and can complete the fine phase correction to multi-channel radio frequency front end.This method is verified in the development process of certain anti-interference component of model multichannel satellite fix, obtains good effect.
Description
Technical field
The invention belongs to air-fired missile road radio-frequency front-end phasing field, it is related to a kind of multi-channel radio frequency front end phase
Bearing calibration.
Background technology
Bearing calibration at present to multi-channel radio frequency front end phase is all more complicated or needs to use expensive special
Tester, mainly there is two kinds：Carried out by software receiver or vector network analyzer.Software receiver method is led to
Cross and correction signal is implanted sequentially in each passage RF circuits, after the RF circuit transmissions of mismatch, this is believed
After number being de-spread by software receiver compared with reference channel result, phase offset is obtained, correction factor is then calculated.
Vector network analyzer method is tested each passage RF circuits by expensive vector network analyzer hardware,
By compared with reference channel result, obtaining phase offset, then calculating correction factor.Enter using aerial array
During the jamproof product developments of row GPS, the phase equalization of multi-channel radio frequency front end adaptively resists to rear end to be done
The performance for disturbing Digital Signal Processing has a great impact, and larger Sensor gain and phase perturbations result even in algorithm failure.For
This, it is necessary to the phase to multi-channel radio frequency front end is corrected.But or bearing calibration algorithm known today is extremely multiple
Or it is miscellaneous, need to use expensive vector network analyzer, a variety of difficulties are all brought to practical operation.
The content of the invention
The purpose of the present invention is：A kind of multi-channel radio frequency front end method for correcting phase is provided, this method simple possible,
It need not be the purpose that phasing can be achieved using expensive device.
The technical scheme is that：A kind of multi-channel radio frequency front end method for correcting phase, is used a kind of more logical
Road radio-frequency front-end phase correction system, the system by several radio-frequency channels and respective numbers analog-digital converter (A/D)
And a fpga chip is constituted, the radio-frequency channel is connected with analog-digital converter respectively, the analog-digital converter other end point
It is not connected with FPGA；
The radio-frequency channel is used to high-frequency signal being changed into analog if signal；
The analog-digital converter is used to analog if signal being changed into digital medium-frequency signal；
The FPGA is used to digital medium-frequency signal being changed into the lower baseband signal of frequency, for correcting each radio-frequency channel
Between difference；
Also use an one-to-two power splitter, one-to-two power splitter and two same specification RF cable cables 1 and cable
2 connect firmly, and signal source generates the single carrier of radio-frequency channel working frequency, the input of feed-in one-to-two power splitter, its spy
Levy and be, comprise the following steps：
Step 1: absolute phase difference of all radio-frequency channels (2,3 ..., N) relative to radio-frequency channel 1 is calculated, including
Following steps：
(1) cable 1 is connected with radio-frequency channel 2, cable 2 is connected with radio-frequency channel 1, to two-way baseband signal simultaneously
Progress, which is observed, obtains sampled point number N, on the basis of radio-frequency channel 2, according to the load after data transfer rate M and down coversion
Radio-frequency channel 1 is tried to achieve in wave frequency rate F and radio-frequency channel 1 relative to the sampled point number N that radio-frequency channel 2 is deviateed
Relative to the size and symbol of the relative phase difference of radio-frequency channel 2：
θ12=(L2+T1)-(L1+T2)
Symbol is determined by phase relation, advanced for just, backwardness is negative；Wherein, it is described
L1, L2, be respectively cable 1 and cable 2 relative to the phase delay of signal source, T1, T2 are respectively radio-frequency channel
1 and the phase delay brought of radio-frequency channel 2；
(2) passage on the basis of radio-frequency channel 2 is chosen, cable 1 is connected with reference channel；
(3) it is passage to be measured to choose radio-frequency channel 3, and cable 2 is connected with radio-frequency channel 3, radio-frequency channel is drawn
3 relative to radio-frequency channel 2 relative phase difference：
And then draw absolute phase difference of the radio-frequency channel 3 relative to radio-frequency channel 1
(4) it is passage to be measured to choose radio-frequency channel 4, and cable 2 is connected with radio-frequency channel 4, radio-frequency channel is drawn
4 relative to radio-frequency channel 2 phase difference
And then draw absolute phase difference of the radio-frequency channel 4 relative to radio-frequency channel 1
(5) repeat step (3) or (4), until drawing last radio-frequency channel N relative to radio-frequency channel 1
Absolute phase difference
(6) passage on the basis of the Q of radio-frequency channel is chosen, cable 1 and reference channel are connected, cable 2 and radio frequency are led to
Road 1 is connected, and tries to achieve θ1Q=(L2+T1)-(L1+TQ), then cable 2 is connected with radio-frequency channel 2, try to achieve
And then draw absolute phase difference of the radio-frequency channel 2 relative to radio-frequency channel 1
So far, absolute phase difference of all radio-frequency channels (2,3 ..., N) relative to radio-frequency channel 1 is obtained
Step 2: to respective radio-frequency passage carry out phase compensation, according to above-mentioned absolute phase difference AD sampling after to phase
Radio-frequency channel is answered to carry out phase compensation；The baseband signal format of each radio-frequency channel is respectively： Then each radio-frequency channel is multiplied by 1 respectively,Phase can be adjusted
It is whole consistent, complete phasing.
It is an advantage of the invention that：This method need not write the software receiver of complexity, it is not required that expensive
In the case of vector network analyzer, it is only necessary to an one-to-two power splitter and write simple down coversion program
Complete the fine phase correction to multi-channel radio frequency front end.This method is anti-interference in certain model multichannel satellite fix
It is verified in the development process of component, obtains good effect.
Brief description of the drawings
Fig. 1 is the schematic diagram of the embodiment of multi-channel radio frequency front end of the present invention phase correction system one；
Fig. 2 is the company for the embodiment of method one that multi-channel radio frequency front end of the present invention phase system carries out front end phasing
Connect graph of a relation；
Fig. 3 is that one embodiment of the invention signal waveform phase-contrast asks differential to be intended to.
Embodiment
Below in conjunction with the accompanying drawings and example is described in further detail to the present invention.
As shown in figure 1, a kind of multi-channel radio frequency front end phase correction system, by several radio-frequency channels and respective numbers
Analog-digital converter (A/D) and fpga chip composition, the quantity of radio-frequency channel and analog-digital converter is according to day
The quantity of linear array array element determines that the radio-frequency channel is connected by same specification RF cable with analog-digital converter respectively,
The analog-digital converter other end is connected with FPGA respectively；
The radio-frequency channel is used to high-frequency signal being changed into analog if signal；
The analog-digital converter is used to analog if signal being changed into digital medium-frequency signal；
The FPGA is used to digital medium-frequency signal being changed into the lower baseband signal of frequency, for correcting each radio-frequency channel
Between difference.
As shown in Fig. 2 the method that a kind of multi-channel radio frequency front end phase system carries out front end phasing, is used
Multi-channel radio frequency front end phase correction system and an one-to-two power splitter are stated, one-to-two power splitter is penetrated with two same specifications
Frequency cable cable 1 and cable 2 are connected firmly, and signal source generates the single carrier of radio-frequency channel working frequency, feed-in one-to-two work(
Divide the input of device, comprise the following steps：
Step 1: absolute phase difference of all radio-frequency channels (2,3 ..., N) relative to radio-frequency channel 1 is calculated, including
Following steps：
(1) cable 1 is connected with radio-frequency channel 2, cable 2 is connected with radio-frequency channel 1, to two-way baseband signal simultaneously
Progress, which is observed, obtains sampled point number N, on the basis of radio-frequency channel 2, according to the load after data transfer rate M and down coversion
Radio-frequency channel 1 is tried to achieve in wave frequency rate F and radio-frequency channel 1 relative to the sampled point number N that radio-frequency channel 2 is deviateed
Relative to the size and symbol of the relative phase difference of radio-frequency channel 2：
θ12=(L2+T1)-(L1+T2)
Symbol is determined by phase relation, advanced for just, backwardness is negative；Wherein, it is described
L1, L2, be respectively cable 1 and cable 2 relative to the phase delay of signal source, T1, T2 are respectively radio-frequency channel
1 and the phase delay brought of radio-frequency channel 2；Relative phase difference θ12It is to differ uncertain comprising cable 1 and cable 2
, this uncertainty is to be unlikely to be completely isometric by cable 1 and cable 2 to cause；
(2) passage on the basis of radio-frequency channel 2 is chosen, cable 1 is connected with reference channel；
(3) it is passage to be measured to choose radio-frequency channel 3, and cable 2 is connected with radio-frequency channel 3, radio-frequency channel is drawn
3 relative to radio-frequency channel 2 relative phase difference：
And then draw absolute phase difference of the radio-frequency channel 3 relative to radio-frequency channel 1
(4) it is passage to be measured to choose radio-frequency channel 4, and cable 2 is connected with radio-frequency channel 4, radio-frequency channel is drawn
4 relative to radio-frequency channel 2 phase difference
And then draw absolute phase difference of the radio-frequency channel 4 relative to radio-frequency channel 1
(5) repeat step (3) or (4), until drawing last radio-frequency channel N relative to radio-frequency channel 1
Absolute phase difference
(6) passage on the basis of the Q of radio-frequency channel is chosen, cable 1 and reference channel are connected, cable 2 and radio frequency are led to
Road 1 is connected, and tries to achieve θ1Q=(L2+T1)-(L1+TQ), then cable 2 is connected with radio-frequency channel 2, try to achieve
θ2Q=(L2+T2)-(L1+TQ),
θ2Q-θ1Q={ (L2+T2)-(L1+TQ) }-{ (L2+T1)-(L1+TQ) }=T2-T1
And then draw absolute phase difference of the radio-frequency channel 2 relative to radio-frequency channel 1
So far, absolute phase difference of all radio-frequency channels (2,3 ..., N) relative to radio-frequency channel 1 is obtained
Step 2: to respective radio-frequency passage carry out phase compensation, according to above-mentioned absolute phase difference AD sampling after to phase
Radio-frequency channel is answered to carry out phase compensation；The baseband signal format of each radio-frequency channel is respectively： Then each radio-frequency channel is multiplied by 1 respectively,Phase can be adjusted
It is whole consistent, complete phasing.
Example：
As shown in Figures 2 and 3, by taking 4 passage array elements as an example, F=10KHz, M=36MHz, now measurement accuracy
(1) cable 1 is connected with radio-frequency channel 2, cable 2 is connected with radio-frequency channel 1, to two-way baseband signal simultaneously
Progress, which is observed, obtains sampled point number 100, on the basis of radio-frequency channel 2, according to the load after data transfer rate M and down coversion
The sampled point number 100 that wave frequency rate F and the radio-frequency channel 1 measured deviate advanced radio-frequency channel 2, tries to achieve radio frequency and leads to
Road 1 relative to radio-frequency channel 2 phase difference,
(2) passage on the basis of radio-frequency channel 2 is chosen, cable 1 and reference channel are connected；
(3) it is passage to be measured to choose radio-frequency channel 3, and cable 2 is connected with radio-frequency channel 3, and the radio frequency measured leads to
Road 3 falls behind the sampled point number 80 that passage 2 deviates, and draws phase difference of the radio-frequency channel 3 relative to radio-frequency channel 2Draw absolute phase difference of the radio-frequency channel 3 relative to radio-frequency channel 1
(4) it is passage to be measured to choose radio-frequency channel 4, and cable 2 is connected with radio-frequency channel 4, and the radio frequency measured leads to
Road 3 falls behind the sampled point number 150 that radio-frequency channel 2 is deviateed, and draws phase of the radio-frequency channel 3 relative to radio-frequency channel 2
Potential differenceShow that radio-frequency channel 4 is absolute relative to radio-frequency channel 1
Phase difference
(5) passage on the basis of radio-frequency channel 3 is chosen, cable 1 is connected with radio-frequency channel 3, by cable 2 with penetrating
Frequency passage 1 is connected, and it is 190 to measure the sampled point number deviateed the advanced radio-frequency channel 3 in radio-frequency channel 1, draws radio frequency
Phase difference of the passage 1 relative to radio-frequency channel 3Again by cable 2 with
Radio-frequency channel 2 is connected, and it is 100 to measure the sampled point number deviateed the advanced radio-frequency channel 3 in radio-frequency channel 1, obtains outgoing
Phase difference of the frequency passage 2 relative to radio-frequency channel 3Show that radio frequency leads to
Absolute phase difference of the road 2 relative to radio-frequency channel 1
So far, absolute phase difference of all radio-frequency channels relative to radio-frequency channel 1 has been obtained：
The baseband signal format of each radio-frequency channel is respectively：H, H*e-9j, H*e-18j, H*e-25j
Then each radio-frequency channel is multiplied by 1, e respectively9j, e18j, e25j, you can phase adjustment is consistent
Each radio-frequency channel phase is as shown in the table relative to the adjusting offset context of 1 radio-frequency channel：
| Radio-frequency channel | 1 (reference channel) | 2 | 3 | 4 |
| Phase before adjustment | 0 | -9 | -18 | -25 |
| Phase after adjustment | 0 | 0 | 0 | 0 |
Claims (1)
1. a kind of multi-channel radio frequency front end method for correcting phase, uses a kind of multi-channel radio frequency front end phasing system
System, the system by several radio-frequency channels and respective numbers analog-digital converter (A/D) and a fpga chip group
Into the radio-frequency channel is connected with analog-digital converter respectively, and the analog-digital converter other end is connected with FPGA respectively；
The radio-frequency channel is used to high-frequency signal being changed into analog if signal；
The analog-digital converter is used to analog if signal being changed into digital medium-frequency signal；
The FPGA is used to digital medium-frequency signal being changed into the lower baseband signal of frequency, for correcting each radio-frequency channel
Between difference；
Also use an one-to-two power splitter, one-to-two power splitter and two same specification RF cable cables 1 and cable
2 connect firmly, and signal source generates the single carrier of radio-frequency channel working frequency, the input of feed-in one-to-two power splitter, its spy
Levy and be, comprise the following steps：
Step 1: absolute phase difference of all radio-frequency channels (2,3 ..., N) relative to radio-frequency channel 1 is calculated, including
Following steps：
(1) cable 1 is connected with radio-frequency channel 2, cable 2 is connected with radio-frequency channel 1, to two-way baseband signal simultaneously
Progress, which is observed, obtains sampled point number N, on the basis of radio-frequency channel 2, according to the load after data transfer rate M and down coversion
Radio-frequency channel 1 is tried to achieve in wave frequency rate F and radio-frequency channel 1 relative to the sampled point number N that radio-frequency channel 2 is deviateed
Relative to the size and symbol of the relative phase difference of radio-frequency channel 2：
θ12=(L2+T1)-(L1+T2)
Symbol is determined by phase relation, advanced for just, backwardness is negative；Wherein, it is described
L1, L2, be respectively cable 1 and cable 2 relative to the phase delay of signal source, T1, T2 are respectively radio-frequency channel
1 and the phase delay brought of radio-frequency channel 2；
(2) passage on the basis of radio-frequency channel 2 is chosen, cable 1 is connected with reference channel；
(3) it is passage to be measured to choose radio-frequency channel 3, and cable 2 is connected with radio-frequency channel 3, radio-frequency channel is drawn
3 relative to radio-frequency channel 2 relative phase difference：
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Radio-frequency channel is answered to carry out phase compensation；The baseband signal format of each radio-frequency channel is respectively：H, Then each radio-frequency channel is multiplied by 1 respectively,Phase can be adjusted
It is whole consistent, complete phasing.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107182282B true CN107182282B (en) | 2014-12-03 |
Family
ID=
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106341152A (en) * | 2015-07-08 | 2017-01-18 | 中国科学院微电子研究所 | Radio frequency front end, transmitting terminal, receiving terminal and MIMO (Multiple-Input Multiple-Output) communication system |
| CN106973395A (en) * | 2016-01-14 | 2017-07-21 | 中兴通讯股份有限公司 | The method and apparatus and radio frequency feedthrough system of chain calibration |
| CN108449084B (en) * | 2018-02-11 | 2020-06-30 | 中国科学院高能物理研究所 | Method and system for multi-channel phase automatic correction of digital BPM (Business Process management) sampling data |
| CN113098502A (en) * | 2021-04-01 | 2021-07-09 | 中国空空导弹研究院 | Digital down-conversion processing method of multiplication-free architecture |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106341152A (en) * | 2015-07-08 | 2017-01-18 | 中国科学院微电子研究所 | Radio frequency front end, transmitting terminal, receiving terminal and MIMO (Multiple-Input Multiple-Output) communication system |
| CN106341152B (en) * | 2015-07-08 | 2019-02-05 | 中国科学院微电子研究所 | A kind of radio-frequency front-end, transmitting terminal, receiving end and MIMO communication system |
| CN106973395A (en) * | 2016-01-14 | 2017-07-21 | 中兴通讯股份有限公司 | The method and apparatus and radio frequency feedthrough system of chain calibration |
| CN106973395B (en) * | 2016-01-14 | 2021-04-20 | 中兴通讯股份有限公司 | Method and device for link calibration and radio frequency feed-in system |
| CN108449084B (en) * | 2018-02-11 | 2020-06-30 | 中国科学院高能物理研究所 | Method and system for multi-channel phase automatic correction of digital BPM (Business Process management) sampling data |
| CN113098502A (en) * | 2021-04-01 | 2021-07-09 | 中国空空导弹研究院 | Digital down-conversion processing method of multiplication-free architecture |
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