CN110289920A - A kind of phase alignment of the multi-channel wide with receive-transmit system - Google Patents
A kind of phase alignment of the multi-channel wide with receive-transmit system Download PDFInfo
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- CN110289920A CN110289920A CN201910223595.XA CN201910223595A CN110289920A CN 110289920 A CN110289920 A CN 110289920A CN 201910223595 A CN201910223595 A CN 201910223595A CN 110289920 A CN110289920 A CN 110289920A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/11—Monitoring; Testing of transmitters for calibration
- H04B17/12—Monitoring; Testing of transmitters for calibration of transmit antennas, e.g. of the amplitude or phase
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/21—Monitoring; Testing of receivers for calibration; for correcting measurements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
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Abstract
The present invention provides a kind of phase alignment of the multi-channel wide with receive-transmit system, detailed process are as follows: calibration source, phase alignment module and work mode switcher is arranged in multi-channel wide band receive-transmit system；In the calibration mode, make multi-channel wide with the radiofrequency signal of receive-transmit system reception calibration source by work mode switcher, Receiver Module is transferred to phase alignment module after pre-processing to it；The phase alignment module is handled per reception signal all the way, is calculated the corresponding phase alignment factor of each access and is stored；In the normal mode, multi-channel wide band receive-transmit system is made to receive external radio-frequency signal by work mode switcher, Receiver Module is transferred to phase alignment module after pre-processing to it；The phase alignment module carries out phase compensation using the phase alignment factor pair received signal of storage.The present invention can effectively solve the problem that the inter-channel phase inconsistence problems of radio frequency multichannel transmitting-receiving system.
Description
Technical field
The invention belongs to communicate and Radar Signal Processing Technology field, and in particular to a kind of multi-channel wide band receive-transmit system
Phase alignment.
Background technique
With communication system and radar system functions expanding and performance boost, the transmitting-receiving of multi-channel wide band becomes important front end
Technology is widely used in the application such as MIMO communication, digital bea mforming, phased-array radar.Multi-channel wide band receive-transmit system receiving unit
Divide exemplary block diagram, as shown in Figure 1.
System receives external radio-frequency signal by N number of receiving port, is transferred to data after being acquired by RF transceiver
Receiving module is pre-processed, and carries out corresponding algorithm process by algoritic module later.
RF transceiver usually has following two typical clock input mode, and method one is that reference clock signal is directly defeated
Enter, forms internal local oscillation signal after internal phaselocked loop.Method two is directly external local oscillation signal input.However, both of which
Phase is inconsistent between will cause multichannel, leads to system performance degradation even system dysfunction.One main cause of method is each
PLL frequency locking time difference and divide operation lead to the phase inconsistence problems of local oscillation signal between multichannel inside channel transceiver.
Two main cause of method is that the divide operation of external local oscillation signal leads to phase fuzzy problem between multichannel.
Summary of the invention
In view of this, can effectively be solved the present invention provides a kind of phase alignment of radio frequency multichannel transmitting-receiving system
The certainly inter-channel phase inconsistence problems of radio frequency multichannel transmitting-receiving system.
Realize that technical scheme is as follows:
A kind of phase alignment of the multi-channel wide with receive-transmit system, detailed process are as follows:
Calibration source, phase alignment module and work mode switcher are set in multi-channel wide band receive-transmit system；
In the calibration mode, believed by the radio frequency that work mode switcher makes multi-channel wide receive calibration source with receive-transmit system
Number, Receiver Module is transferred to phase alignment module after pre-processing to it；The phase alignment module connects all the way to every
The collection of letters number is handled, and is calculated the corresponding phase alignment factor of each access and is stored；
In the normal mode, multi-channel wide band receive-transmit system is made to receive external radio-frequency signal by work mode switcher,
Receiver Module is transferred to phase alignment module after pre-processing to it；The phase alignment module utilizes the phase stored
Calibration factor carries out phase compensation to received signal.
Further, the calculating phase alignment factor of the present invention are as follows:, will using the phase of a wherein access as fixed phase
It is poor that the phase of remaining access and the fixed phase are made, using obtained phasometer calculate the phasing of each access because
Son.
Further, phase alignment module of the present invention is handled per reception signal all the way are as follows:
FFT is carried out to it for per signal, phase alignment module all the way, filters out the maximum value of FFT result, by described in most
Frequency point of the big value as calibration source radio-frequency transmissions, the ratio of two frequency components corresponding to the frequency point are negated tangent value, as
Per the phase value for receiving signal all the way.
Further, the present invention when external radio-frequency signal frequency jump or due to other reasons need to carry out it is secondary
When calibration, manual switching operating mode is calibration mode, and changing calibration source is corresponding frequency point.
Beneficial effect
The present invention is based on typical multi-channel wide band receive-transmit systems to optimize, and real using calibration source and phase alignment module
The calibration to multi-channel radio frequency transceiver system receiving phase is showed, to efficiently solve as caused by RF transceiver local oscillator
Phase inconsistence problems, for the harsh phased-array radar of phase requirements, MIMO communicate etc. systems design provide high performance-price ratio,
High integration solution.
Detailed description of the invention
Fig. 1 is multi-channel wide band receive-transmit system receiving portion exemplary block diagram；
Fig. 2 is the calibrating installation block diagram based on typical multi-channel wide with receive-transmit system；
Fig. 3 is that phase alignment module extracts phase information workflow schematic diagram；
Fig. 4 is that 16 channel widebands based on AD9361 receive system block diagram；
Fig. 5 is the not calibrated data time domain waveform in 16 channels；
Fig. 6 is data time domain waveform after the calibration of 16 channels.
Specific embodiment
The following describes the present invention in detail with reference to the accompanying drawings and specific embodiments.
The targeted multi-channel wide band receive-transmit system of the embodiment of the present invention, receiving portion including multichannel as shown in Figure 1, penetrate
Frequency transceiver, external local oscillator, reference clock, data reception module and algoritic module, this method is in multi-channel wide band receive-transmit system
Middle introducing calibration source increases work mode switcher in the input terminal of RF transceiver, for realizing calibration mode and normal work
Hand between operation mode automatically switches；Calibration source is connect by work mode switcher with the end RF transceiver RX, in calibration mode
Under, RX terminates close alignment source radiofrequency signal, and under normal mode of operation, the end RX receives the input of external interface radiofrequency signal；In signal
Increase by a phase alignment module in process flow, for realizing phase alignment, as shown in Figure 2.
In the calibration mode, believed by the radio frequency that work mode switcher makes multi-channel wide receive calibration source with receive-transmit system
Number, Receiver Module is transferred to phase alignment module after pre-processing to it；The phase alignment module connects all the way to every
The collection of letters number is handled, and is calculated the corresponding phase alignment factor of each access and is stored；
In the normal mode, multi-channel wide band receive-transmit system is made to receive external radio-frequency signal by work mode switcher,
Receiver Module is transferred to phase alignment module after pre-processing to it；The phase alignment module utilizes the phase stored
Calibration factor, respectively to received multiple signals carry out phase compensation, then by the signal after calibration be transferred to algoritic module into
Row algorithm process.
As shown in figure 3, one embodiment of the invention, phase alignment module calculates phase alignment module and receives number all the way to every
According to progress Fast Fourier Transform (FFT) calculating (abbreviation FFT), and filter out the maximum value of every road FFT result.Ideally, the value
Frequency point f is sent for calibration source radio frequency, the ratio of two frequency components corresponding to the frequency point is negated tangent value, is obtained per connecing all the way
The phase value of the collection of letters number.Taking first via RF transceiver phase value is fixed phaseCirculation by the road N phase value respectively with
Comparing calculation obtains phase difference.The corresponding phase alignment factor of the paths is calculated using this group of phase difference value, and by N number of phase
Position calibration factor is stored.
With reference to the accompanying drawing and by taking the 16 channel wideband reception systems based on AD9361 as an example, as shown in figure 4, to the present invention
It is described in detail.
Calibration source used in the present invention is that an outside can jump radio frequency, and 16 channel radio frequency receiving portions are by 8 AD9361
RF transceiver composition, every AD9361 RF transceiver possess 2 tunnel receiving channels and 2 road transmission channels, wherein every road receives
All there are three input interface A, B, C in channel.Since two receiving channel of AD9361 shares an internal receipt local oscillator, when calibrating only
It needs to calibrate the channel 1 of every AD9361.Under normal mode of operation, 16 AD9361 receive 1 channel A mouthfuls and reception 2
Channel A mouthfuls of reception external radio frequency input signal under calibration mode, can jump radio frequency source transmitting RF calibration signal, pass through 1 point 8
1 channel B mouthfuls of acquisition is received by every AD9361 after passive power splitter.Operating mode switching is completed by Zynq controller.
Phase calibration process is as follows:
Firstly, system uses outer local oscillator mode, local frequency 2f0.16 AD9361 are configured after powering on uses frequency point f0It adopts
Collection, and it is configured to B interface work.After the completion of configuration, outside can jump radio frequency source and choose frequency point f0Emit a radiofrequency signal, 16
It is pre-processed after the acquisition of AD9361 receiving channel by the end Zynq processor PL, and is sent out data after pretreatment by AXI bus
Give the end PS.The end PS first carries out FFT calculating to 16 groups of data, obtains every road rf data frequency spectrum, and screen by maximum value
To the dominant frequency component on every road, ideally, which is frequency point f0。
Then, arctangent computation is carried out to the vector of two frequency components of 16 groups of frequency points, obtains 16 groups of rf datas
Phase value.Taking first via AD9361 phase value is fixed phaseIt is recycled by for, comparison obtains every road AD9361 respectively
The relatively fixed phase difference of receiving channelIt is ginseng because selection is first via AD9361 phase value
Phase is examined, the phase difference comparedIt should be 0 °.Utilize fixed skewCalculate extract obtain 16 phase alignments because
Son, and be deposited into RAM memory, terminate calibration mode.
Zynq controller receives 1 channel A mouthfuls of work by 8 AD9361 register manipulations, configuring it, and it is logical to receive 2
Road A mouthfuls of work, into normal mode of operation.Under normal mode of operation, 16 receiving channels acquire the received radio frequency of external antenna
Signal, and after being pre-processed by the end Zynq processor PL, rf data is sent to by the end PS by AXI bus, the end PS is at this time
Phase compensation only is carried out to radiofrequency signal, specific method is the phase school that the end PS is calculated under taking-up calibration mode in RAM
16 groups of data are distinguished corresponding phase alignment fac-tor and carry out phase compensation, compensated radio frequency by quasi-divisor, circulation
Signal data is with phase rf data.Rf data after compensation is sent to PL end data by AXI bus and sends mould by the end PS
Data are uploaded to host computer by a network interface by block, data transmission blocks, and according to system concrete application, host computer is to rf data
Carry out its corresponding algorithm process.
It optionally, can be manual when radio frequency signal frequency carries out jump or needs to carry out secondary calibration due to other reasons
Switching working mode is calibration mode, changes the external calibration source that can jump as corresponding frequency point, re-executes the above process.
Using the above method, system can be received for 16 channel widebands based on AD9361 and realized to 16 receiving channels
Phase alignment.It realizes and surveys on certain 16 channel AD9361 radio frequency reception board below based on calibration method provided by the invention
Examination.Board is powered on automatically into calibration mode, extracts calibration factor.After the completion of calibration mode, under normal mode of operation, 16 channels
It is as shown in Figure 5 to receive not calibrated data, it can be seen that there are biggish fixed skews for 16 interchannels.
Time domain waveform after 16 channel AD9361 are received with data progress phase alignment is as shown in Figure 6, it can be seen that eliminates
The inconsistent phenomenon of larger phase of former interchannel, each phase difference between channels are as shown in table 1.
Inter-channel phase difference after table 1 is calibrated
| Channel number | Phase difference | Channel number | Phase difference |
| Channel 1 | 0° | Channel 9 | -2.85° |
| Channel 2 | -4.25° | Channel 10 | 1.77° |
| Channel 3 | -0.87° | Channel 11 | -3.54° |
| Channel 4 | 0.29° | Channel 12 | -3.452° |
| Channel 5 | 0.65° | Channel 13 | -1.03° |
| Channel 6 | 0.53° | Channel 14 | -3.26° |
| Channel 7 | 2.3° | Channel 15 | 3.91° |
| Channel 8 | 4.5° | Channel 16 | 1.47° |
As can be seen from Table 1, school is carried out using 16 channel reception data of the method proposed by the present invention to AD9361
After standard, the fixed skew of 16 interchannels is effectively eliminated, by phase-difference control between system channel within ± 5 °, meets base
In the 16 channel reception system design objectives of AD9361.
In conclusion the above is merely preferred embodiments of the present invention, being not intended to limit the scope of the present invention.
All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in of the invention
Within protection scope.
Claims (4)
1. a kind of phase alignment of multi-channel wide with receive-transmit system, which is characterized in that detailed process are as follows:
Calibration source, phase alignment module and work mode switcher are set in multi-channel wide band receive-transmit system；
In the calibration mode, by work mode switcher make multi-channel wide with receive-transmit system receive calibration source radiofrequency signal,
Receiver Module is transferred to phase alignment module after pre-processing to it；The phase alignment module is believed per reception all the way
It number is handled, calculates the corresponding phase alignment factor of each access and store；
In the normal mode, multi-channel wide band receive-transmit system is made to receive external radio-frequency signal, radio frequency by work mode switcher
Receiving module is transferred to phase alignment module after pre-processing to it；The phase alignment module utilizes the phase alignment stored
Factor pair received signal carries out phase compensation.
2. phase alignment of the multi-channel wide with receive-transmit system according to claim 1, which is characterized in that the calculating phase
Position calibration factor are as follows: using the phase of a wherein access as fixed phase, it is poor that the phase of remaining access and the fixed phase are made,
The phase correction factor of each access is calculated using obtained phasometer.
3. phase alignment of the multi-channel wide with receive-transmit system according to claim 1, which is characterized in that the phase school
Quasi-mode block is handled per reception signal all the way are as follows:
FFT is carried out to it for per signal, phase alignment module all the way, the maximum value of FFT result is filtered out, by the maximum value
As the frequency point of calibration source radio-frequency transmissions, the ratio of two frequency components corresponding to the frequency point is negated tangent value, as each
The phase value of road reception signal.
4. phase alignment of the multi-channel wide with receive-transmit system according to claim 1, which is characterized in that work as external radio frequency
When the frequency of signal jump or need to carry out secondary calibration due to other reasons, manual switching operating mode is calibrating die
Formula, changing calibration source is corresponding frequency point.
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| CN201910223595.XA CN110289920A (en) | 2019-03-22 | 2019-03-22 | A kind of phase alignment of the multi-channel wide with receive-transmit system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114268382A (en) * | 2022-02-28 | 2022-04-01 | 四川鸿创电子科技有限公司 | Method, device and equipment for automatically calibrating AD9361 board card and storage medium |
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| WO2018102671A1 (en) * | 2016-12-02 | 2018-06-07 | National Instruments Corporation | Frequency response calibration of synchronized mimo measurement receivers with local and remote transmitters |
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| EP2290382A1 (en) * | 2009-08-31 | 2011-03-02 | Motorola, Inc. | Scalable self-calibrating and configuring radio frequency head for a wireless communication system |
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| CN114268382A (en) * | 2022-02-28 | 2022-04-01 | 四川鸿创电子科技有限公司 | Method, device and equipment for automatically calibrating AD9361 board card and storage medium |
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