CN104917556B - A kind of synchronous multibeam signals generation method based on ultrahigh speed DAC - Google Patents
A kind of synchronous multibeam signals generation method based on ultrahigh speed DAC Download PDFInfo
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- CN104917556B CN104917556B CN201510182083.5A CN201510182083A CN104917556B CN 104917556 B CN104917556 B CN 104917556B CN 201510182083 A CN201510182083 A CN 201510182083A CN 104917556 B CN104917556 B CN 104917556B
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- signal
- multibeam signals
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Classifications
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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
- H04B7/0426—Power distribution
- H04B7/043—Power distribution using best eigenmode, e.g. beam forming or beam steering
-
- 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
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
Abstract
The present invention relates to a kind of synchronous multibeam signals generation method based on ultrahigh speed DAC, belong to signal of communication processing technology field.The present invention directly transmits multiple beam signals by ultrahigh speed DAC chip AD9739 to realize, each beam signal is the controllable intermediate frequency or rf modulated signal of frequency, amplitude and phase, and such multibeam signals can be sent respectively per a piece of DAC.With it is traditional carried out with upconverter simulating up-conversion compared with, the problem of greatling save cost, and avoid analog circuit temperature drift, aging；The frequency and phase of beam signal can flexibly, be accurately configured using DDS, particular beam signal can be configured in real time according to user's request, reduces test error.
Description
Technical field
The present invention relates to a kind of synchronous multibeam signals generation method based on ultrahigh speed DAC, belongs to signal of communication processing
Technical field.
Background technology
DBF (digital beam froming) refers to the directional diagram that Automatic Optimal array antenna is played by adjusting the weighted value of antenna
Effect, so as to realize that forming main beam in a particular direction is used for receiving useful signal, and suppress on other directions dry
Disturb signal.DBF technologies can be adaptive generation digital beam, and carry out Nonlinear Processing, can realize that spatial domain is anti-interference, change
The function of kind angular resolution.Meanwhile DBF can generate multiple independent and controllable wave beam in the case where not losing signal to noise ratio,
Beam feature flexibility and changeability；The self-correcting of this antenna and inhibition to secondary lobe are significantly stronger than analog beam and formed.
AD9739 is that a quantization digit is 14bit, and highest sample rate can reach 2.5Gsps ultrahigh speed DAC, this
One distinguishing feature of chip is available with the signal that the mixed mode of itself directly transmits S-band, with conventional up conversion side
Formula improves the reliability of equipment compared to cost is greatlyd save.
The content of the invention
The invention aims to realize to directly transmit multibeam signals by ultrahigh speed DAC chip, it is proposed that a kind of
Synchronous multibeam signals generation method based on ultrahigh speed DAC.By ultrahigh speed DAC chip AD9739 come realize directly transmit it is more
Individual beam signal, each beam signal are the controllable intermediate frequencies or rf modulated signal of frequency, amplitude and phase, per a piece of
DAC can send such multibeam signals respectively.
The present invention is achieved by the following technical solutions.
A kind of synchronous multibeam signals generation method based on ultrahigh speed DAC, its step are as follows：
Step 1: using the information flow of a baseband signal complete 1, the PN code-phases of information flow and 1 group of setting, which multiply, to be spread,
And the data obtained to spread spectrum directly carry out reversal.
Step 2: to improve data rate, the data that step 1 is obtained carry out the operation of interpolation 0, then by after interpolation
Data pass through root raised cosine filter and carry out Wave beam forming.
Step 3: generate frequency with Direct Digital Synthesizer (DDS), phase information configures according to mission requirements
Sine wave carrier, and this carrier wave is multiplied with the data that step 2 obtains, obtain being loaded with the modulated signal of frequency and phase information.
Step 4: the modulated signal obtained by step 3 is multiplied by into an amplitude regulation coefficient, amplitude regulation coefficient is a m
The data of bit, line amplitude adjustment is entered to modulated signal, obtaining one has frequency, the wave beam of phase and amplitude information.
Step 5: changing in step 1 the PN codes set, then repeat step one arrives step 4, and it is right to obtain different PN codes
The wave beam answered.Repeatedly change PN codes, corresponding multiple wave beams are obtained, and obtained multiple wave beams are mixed and are superimposed, obtain one
Multibeam signals.
Step 6: the multibeam signals that step 5 is obtained, which are transmitted into ultrahigh speed DAC chip AD9739, carries out digital-to-analogue turn
Change and be changed into analog signal, then send out analog signal by balun, complete the transmission of a branch of multibeam signals.
Step 6 is arrived, it is more to obtain another way as analog-digital chip, repeat step one Step 7: changing a piece of AD9739
Method of the beam simulation signal, as stated above, n roads multibeam signals are always obtained by n pieces AD9739.Then n pieces AD9739 is entered
The configuration of the SPI synchronous mode registers of row " 1 main n-1 from ", so as to realize that n pieces DAC synchronously sends multibeam signals.
To multibeam signals caused by the inventive method, the measuring method of amplitude and phase information is inside sendaisle：
AD9739 output is transmitted by coaxial cable, and after filtering, amplification and passage switching etc. process pass to receiving terminal.Connect
Receiving end by the synchronous multibeam signals received by quadrature frequency conversion to base band, the signal after down coversion passes through multiphase filtering
Baseband signal is obtained, baseband signal is sent into root raised cosine filter by extracting, and obtained data are respectively fed to multidiameter delay again
Matched filter group, each of which matched filter correspond to the PN codes of a beam component.Then in matched filter
Deferent segment carries out the capture of relevant peaks, and obtained information transfer to host computer is carried out into calculation process and obtains frequency and phase letter
Breath, is then contrasted with transmitting terminal configuration data, completes measurement process.
Beneficial effect
The present invention can directly transmit the ripple of S-band using sample rate up to 2.5Gsps ultrahigh speed DAC chip AD9739
Beam signal, with it is traditional carried out with upconverter simulating up-conversion compared with, greatly save cost, and avoid analog circuit
The problem of temperature drift, aging；The frequency and phase of beam signal can flexibly, be accurately configured using DDS, can be needed according to user
Particular beam signal is configured when realistic；The configuration of n block AD9739 synchronous modes, can be largely between less n pieces AD9739
Because hardware design or plank do not know difference caused by upper electricity every time, reduce corresponding between n pieces AD9739 sendaisle
The amplitude and phase measurement error of wave beam.
Can be to each ripple inside a piece of AD9739 sendaisles using the synchronous multibeam signals generation method of the present invention
The measurement of the amplitude and phase information of beam, can also be to corresponding wave beam between different AD9739 sendaisles (i.e. with same
PN codes configure the wave beam of identical frequency, amplitude and phase information) carry out the measurement of relative amplitude and phase information, measurement result table
The amplitude and phase that bright this method is sent are very accurate, can reach 1 ° of phase and amplitude 0.1dB precision, and different hairs
Send the error between passage very small.
Brief description of the drawings
Fig. 1 is signal generator module basic hardware structural representation in the present invention；
Fig. 2 is the structural representation of synchronous mode in the present invention；
Fig. 3 is the flow chart of the multibeam signals production method of the present invention.
Embodiment
The present invention will be further described with reference to the accompanying drawings and examples and is described in detail.
Fig. 1 is the structural representation of signal generator module synchronous mode.The power supply of signal generator module is provided by backboard, together
When backboard also bear by the amplitude of each wave beam of each passage and phase information be transmitted to FPGA and from FPGA receive feedback information appoint
Business.PROM chips XCF128X connects the program for preserving signal generator module with FPGA.Outside incoming clock enters low jitter
ADCLK954 chips, ADCLK954 chips separate 6 road clocks to be respectively connected to be used as clock in 6 AD9739.FPGA and 6
AD9739 chips, which are connected, to carry out data transmission, each AD9739 output connect balun carry out differential signal be changed into it is single-ended
Signal output.
Fig. 2 is the structural representation of signal generator module synchronous mode.Select the wherein a piece of AD9739 conducts of 6 AD9739
Main leaf, remaining 5 AD9739 are used as from piece, and main leaf provides a DCO clock to FPGA, as FPGA global clock, DCO's
Size provides a DCI clock as AD9739 with road clock for 1/4, FPGA of external clock.Main leaf AD9739 SYNC_
OUT pins access ADCLK846 input pin, and ADCLK846 6 output pins are respectively connected to 6 AD9739 SYNC_IN
In pin, the configuration of 6 AD9739 synchronous modes is thus realized in hardware connection.When ADCLK846 is a low jitter
Clock chip, used herein as the synchronizing chip for 6 DAC.
Fig. 3 is the flow chart of synchronous multibeam signals generation module proposed by the present invention.First by complete 1 baseband signal and
8 groups of preset different PN code-phases, which multiply, to be spread, and obtains 8 groups of spread spectrum datas, and obtained data then are carried out into reversal,
The PN codes of 1 are expanded into the data with sign bit.Then obtained data are carried out with the operation of interpolation 0, interpolation multiple is
64, then data are subjected to beam forming by root raised cosine filter, obtained data are specified with what is directly generated by DDS again
Frequency and the carrier multiplication with phase information, then it is multiplied by an amplitude regulation coefficient to the waveform after modulation again and enters line amplitude
Adjustment, finally by the generation admixed together for sending out, completing multibeam signals of 8 wave beams.
Embodiment
So that transmitting terminal sends S-band signal of the synchronous multi-beam with width phase information as an example, to the specific reality of the present invention
The process of applying illustrates.
The above-mentioned carrier wave frequency range under high s/n ratio is radio frequency, and noise is white Gaussian noise.
Step 1: transmitting terminal uses complete 1 bit stream first, because the purpose of transmitting terminal is to send to believe with specific width
The wave beam of breath, and these base-band informations are not needed, therefore using complete 1 bit stream.By these bit streams directly respectively with 8 groups not
The PN code-phases that same length is 2048, which multiply, to be spread, the information sequence after being spread, and the spreading rate after spread spectrum is
10kHz。
Step 2: one 1 will be filled behind each bit of information sequence after band spectrum modulation, thus by information sequence
It is changed into+1 and -1 signed number, these data is then subjected to 64 times of interpolations, and wave beam is carried out by root raised cosine filter
Shaping.
Step 3: the sine wave carrier of specific frequency and phase is generated using DDS technologies.DDS data depth is 4096,
Bit wide is 8bit, and using 1/4 look-up table, the bit wide of phase accumulator is 48bit, precision 1.65888Gbps/248.Pass through
Any required frequency can be obtained by changing the stepping of phase accumulator, and frequency highest can be set as 2.5GHz, and by more
Required phase can be obtained by changing the address of look-up table, and phase can be with arbitrary disposition between 0 ° -360 °.
Step 4: the data that step 2 obtains are multiplied with the sine wave that step 3 obtains carries out carrier modulation, Ran Houzai
An amplitude regulation coefficient is multiplied by modulated signal to adjust amplitude, and amplitude regulation coefficient is 18bit data, and amplitude can be with
The arbitrary disposition in -25dB-0dB.Finally by 8 beam superpositions to being exported together, be so achieved that frequency, phase and
The generation and transmission for the multibeam signals that amplitude information can all match somebody with somebody.
Step 5: the data processing of four steps above is all realized in FPGA, then by more ripples obtained above
Beam signal is transferred to AD9739 and carries out digital-to-analogue conversion, because data are all difference in FPGA and AD9739, therefore
AD9739 output end connects a difference turn single-ended balun and the differential signal of output is changed into single-ended signal output.Then
Operation is configured according to read-write of the chip handbook to AD9739SPI synchronous mode registers, 6 AD9739 are carried out " 1 master 5 from "
The configuration of synchronous mode, you can it is more with amplitude and phase information with user's assigned frequency to realize that 6 DAC are synchronously sent
Beam signal.
Described above is presently preferred embodiments of the present invention, and the present invention should not be limited to the embodiment and accompanying drawing institute is public
The content opened.It is every not depart from the lower equivalent or modification completed of spirit disclosed in this invention, both fall within the model that the present invention protects
Enclose.
Claims (2)
- A kind of 1. synchronous multibeam signals generation method based on ultrahigh speed DAC, it is characterised in that：Comprise the following steps that：Step 1: using the information flow of a baseband signal complete 1, the PN code-phases of information flow and 1 group of setting, which multiply, to be spread, and right Spread obtained data and directly carry out reversal；Step 2: to improve data rate, the data that step 1 is obtained carry out the operation of interpolation 0, then by the number after interpolation Wave beam forming is carried out according to by a root raised cosine filter；Step 3: carried with the sine wave that Direct Digital Synthesizer generates frequency, phase information configures according to mission requirements Ripple, and this carrier wave is multiplied with the data that step 2 obtains, obtain being loaded with the modulated signal of frequency and phase information；Step 4: the modulated signal obtained by step 3 is multiplied by into an amplitude regulation coefficient, amplitude regulation coefficient is a m bit Data, modulated signal is entered line amplitude adjustment, obtaining one has frequency, the wave beam of phase and amplitude information；Step 5: changing in step 1 the PN codes set, then repeat step one arrives step 4, obtains corresponding to different PN codes Wave beam；Repeatedly change PN codes, corresponding multiple wave beams are obtained, and obtained multiple wave beams are mixed and are superimposed, obtain ripple more than one Beam signal；Step 6: the multibeam signals that step 5 is obtained, which are transmitted into ultrahigh speed DAC chip AD9739, carries out digital-to-analogue conversion turn It is changed into analog signal, then sends out analog signal by balun, completes the transmission of a branch of multibeam signals；Step 6 is arrived, obtains another way multi-beam as analog-digital chip, repeat step one Step 7: changing a piece of AD9739 Analog signal, as stated above, n roads multibeam signals are always obtained by n pieces AD9739；Then n pieces AD9739 is carried out " 1 Main n-1 from " SPI synchronous mode registers configuration, so as to realize n pieces DAC synchronously send multibeam signals.
- 2. a kind of synchronous multibeam signals generation method based on ultrahigh speed DAC according to claim 1, its feature exist In：To caused multibeam signals, the measuring method of amplitude and phase information is inside sendaisle：AD9739 output warp Coaxial cable is crossed to be transmitted, and after filtering, amplification and passage handoff procedure pass to receiving terminal；Receiving terminal is same by what is received Multibeam signals are walked by quadrature frequency conversion to base band, the signal after down coversion obtains baseband signal, base by multiphase filtering Band signal is sent into root raised cosine filter by extracting, and obtained data are respectively fed to multidiameter delay matched filter group again, its In each matched filter correspond to the PN codes of beam component；Then relevant peaks are carried out in the deferent segment of matched filter Capture, then and transmitting terminal and obtained information transfer to host computer is subjected to calculation process and obtains frequency and phase information, Configuration data is contrasted, and completes measurement process.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CA3009761A1 (en) * | 2015-12-29 | 2017-07-06 | Blue Danube Systems, Inc. | Multi-beam crest factor reduction |
| US10084516B2 (en) * | 2016-05-11 | 2018-09-25 | Huawei Technologies Canada Co., Ltd. | Antenna sub-array beam modulation |
| CN108494438A (en) * | 2018-02-11 | 2018-09-04 | 北京理工大学 | A kind of generation method, generating means and the sending device of hybrid spread spectrum signal |
| CN109067439B (en) * | 2018-09-17 | 2021-10-19 | 东南大学 | Testing method adopted by digital multi-beam array transmitting device |
| CN111600605B (en) * | 2020-05-09 | 2024-04-05 | 山东浪潮科学研究院有限公司 | Method and system for realizing DAC output amplitude compensation of measurement and control board card |
| CN113625310B (en) * | 2021-06-18 | 2023-08-29 | 西安空间无线电技术研究所 | Large-range high-linearity orthogonal signal amplitude-frequency dynamic simulation method and simulation system |
| CN116500551B (en) * | 2023-06-21 | 2023-09-12 | 中国科学院空天信息创新研究院 | Frequency modulation signal output method for multiband synthetic aperture radar |
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| CN102368689A (en) * | 2011-10-17 | 2012-03-07 | 北京正唐科技有限责任公司 | Multi-point data transmission system based on wireless spread spectrum communication |
| CN104378125A (en) * | 2014-11-26 | 2015-02-25 | 成都中远信电子科技有限公司 | Land-to-air wideband communication method for unmanned aerial vehicle |
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| US9444534B2 (en) * | 2012-02-06 | 2016-09-13 | Samsung Electronics Co., Ltd. | Apparatus and method for low complexity spatial division multiple access in a millimeter wave mobile communication system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102368689A (en) * | 2011-10-17 | 2012-03-07 | 北京正唐科技有限责任公司 | Multi-point data transmission system based on wireless spread spectrum communication |
| CN104378125A (en) * | 2014-11-26 | 2015-02-25 | 成都中远信电子科技有限公司 | Land-to-air wideband communication method for unmanned aerial vehicle |
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