CN106291106B - Multichannel width phase test system - Google Patents
Multichannel width phase test system Download PDFInfo
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- CN106291106B CN106291106B CN201510257414.7A CN201510257414A CN106291106B CN 106291106 B CN106291106 B CN 106291106B CN 201510257414 A CN201510257414 A CN 201510257414A CN 106291106 B CN106291106 B CN 106291106B
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Abstract
The present invention relates to a kind of multichannel width phase test system, belong to microwave signal measurement technical field.Multichannel width phase test system of the present invention can ensure that width phase measurement accuracy is limited solely by receiver internal thermal noise, without being influenceed by multi-access inference, and compatible with frequency, the concurrent testing of non-same frequency wave beam；Virtual multichannel can be formed, receiving channel inconsistency, effectively reduction transmitting terminal self-inspection and verification, the system complexity for receiving measurement are reduced with time-division measurement；Calibration method improves convenient, and the inconsistency of passage agile matrix, power splitter, DAC and wave filter is eliminated by the way of regular off-line calibration and On-line self-diagnosis and compensation；Width distributed mutually is configured and measurement accuracy is high；Measurement range is wide, can measure intermediate frequency and radio frequency beam Amplitude-phase relation；The scalability of number of channels can be realized, need to only increase the port number of the transmission board of signal transacting composite signal sending module and change signal condition network.
Description
Technical field
The present invention relates to a kind of multichannel width phase test system, belong to microwave signal measurement technical field.
Background technology
With the continuous improvement that people are required satellite communication, communication technology of satellite has obtained very big development.Wherein, defend
Star multibeam antenna has turned at present to be improved satellite communication performance, reduces a key technique of system cost.Transmitter
The structure of multichannel, becomes the potential source of digital beamforming antenna system increasing degree and phase error.With multiple days
Multiple transmitter passages that linear array is connected will have a strong impact on number it is necessary to have very high uniformity, the otherwise mismatch of interchannel
The performance of word beamformer system.One of key technology of the exactly spaceborne digital multiple beam antenna of measurement error multichannel.
In actual phased array antenna system, the amplitude and phase error random due to existing, each list on antenna array
The amplitude and phase of the exciting current of member can not possibly be consistent completely.The reason for causing these random amplitude phase errors is a lot, but
It is that, regardless of error caused by reason, can be represented after all with amplitude phase error.Therefore, it is possible to accurately measurement
The equipment for going out width phase information seems most important in antenna system.
Width mutually tests the measurement as amplitude and phase, and it is many that it is widely used in communication, electronics, material, military affairs etc.
Field.In microwave frequency band, width phase test system is used for RCS tests, Microwave Net test, testing of materials, field of antenna, microwave
Imaging etc., just develops towards high accuracy, high-intelligentization direction at present.
Early stage microwave width phase test system has fluting collimation method, reflectometer method, bridge method etc..But their measurement sensitivity,
Measurement accuracy, dynamic range and the real-time of measurement are poor.
In recent years, on the basis of sweep-frequency reflectometer technology, Network Analyzer is gradually developed.Including scalar network
Analyzer (SNA) and vector network analyzer (VNA).Scalar network analyzer can join to network reflections coefficient and transmission coefficient etc.
The modulus value of amount is measured, and vector network analyzer can simultaneously be measured to amplitude and phase, its test frequency scope,
The each side parameter such as power bracket, precision is all evolving.
Nowadays, width phase test system is evolving, and indices far surpass the product before 10 years.In the world in neck
First status is Luo De and the vector network analyzer of Schwartz company and Agilent company.The Agilent company in measurement frequency
The 2 ports arrow net analyzer of PNA-X series can reach 1.05THz, Luo De and the R＆S ZVA67 of Schwartz company are first
Money reaches 67GHz 4 ports arrow net analyzer.In terms of power output, towards domestic typically no more than 20dBm.Surveying
In terms of measuring speed, the N5244PNA-L of Agilent company test speed is that this has been that width is mutually tested in the world within 9 microseconds
The system medium velocity that can consult reference materials is most fast.And the research at home for width phase test system is also fewer, the vector of commercialization
The index of Network Analyzer is differed also with advanced international standard than larger, the NA7000 series arrow net analyses that such as moral power electronics is produced
Instrument, its frequency range only has 300KHz to 3GHz, peak power output 10dBm.
Although the performance in terms of the every measurement index of these current test equipments is all very excellent, cost is there is
The problems such as height, equipment bulky complex.
The content of the invention
It is an object of the invention to test and monitor the performance indications of digital multi beamforming technology of each stage, it is proposed that one
Kind of multichannel width phase test system, for measuring Amplitude-phase relation between wave beam of the beam-forming network on feed battle array end face.
The present invention is achieved by the following technical solutions.
A kind of multichannel width phase test system, including signal transacting composite module, frequency source module, signal condition network and
Power module.Wherein, signal transacting composite module includes signal transmitting module, signal receiving module, PCIe backboards, blade calculating
Machine.
The annexation of above-mentioned part is：Blade computers are connect by PCIe backboards with signal transmitting module, signal
Receive module interconnection；Power module is respectively connecting to signal transacting combination, signal condition network and frequency source module；Signal is sent
Module and signal condition network interconnection；Signal receiving module is connected with signal condition network, signal condition network and measured piece
(DUT) interconnect；Frequency source module is connected with signal processing module.
Blade computers, to sending module, control sending module production by PCIe backboard send configuration information and control instruction
Multibeam signals needed for raw user, send to signal condition network.Multibeam signals are carried out simulation filter by signal condition network
Ripple, enhanced processing obtain sendaisle signal, then input system under test (SUT).Multibeam signals after system under test (SUT), then via
Signal condition network is back to receiving module, obtains receiving signal.Receiving module docks the collection of letters under the control of blade computers
Number handled.Frequency source module is respectively that receiving module and sending module provide homologous clock.
Signal transacting composite module is core of the invention, and wherein sending module and receiving module completes the system
Signal transmitting and receiving task, blade computers complete test system operational control and result show, state instruction, be multichannel width
Phase test system imports the spread spectrum code word and direction graph parameter of each wave beam, configures the Amplitude-phase relation of each wave beam.
Signal transacting composite module completes configuration, generation, transmission, reception and the processing of multi-beam width phase signals.It is described
Multi-beam width phase signals be one by binary phase shift keying (BPSK) modulation DS CDMA (DS-
CDMA) signal, including intermediate frequency multi-beam width phase signals and radio frequency multi-beam width phase signals.
Blade computers provide good man-machine interface, and the state of whole test system can be monitored in real time, and right in real time
Test data is updated.By the upper computer software in blade computers configuration multi-beam width can be needed to believe according to user
Number amplitude, phase information.
Signal transmitting module includes transmission board polylith parallel, sends board and is connected with PCIe backplane interfaces, every piece
Board receives the instruction that blade computers send and completes configuration, can produce and send and meets user and configured in blade computers
Multi-beam width phase signals.
Signal receiving module includes one piece of board, connects multiple receiving channels as input, concentrates and carry out after signal transacting
Export all the way.Signal receiving module receives the instruction of blade computers, and control signal nurses one's health the passage agile device of network, selects it
In a receiving channel as signal receiving module input.Signal receiving module centering frequency multi-channel width phase signals carry out low pass
Sample, bandpass sampling is carried out to radio frequency multichannel width phase signals, then carry out Digital Down Convert, digital matched filtering, spreading code
Phase capturing, despreading, relative power and phase measurement.After being measured, signal receiving module will be surveyed by PCIe backplane interfaces
Amount result passes to blade computers, and is further processed, shows in blade computers.
Frequency source module provides homologous clock for sending/receiving module.Due to requiring very high in multichannel width phase signals frequency
When also reach very high phase accuracy index request, even if trickle clock jitter also results in phase accuracy divergence indicator
It is far.Therefore use the frequency source customized to meet the clock of system requirements to provide.The frequency accuracy in the custom frequencies source and
Frequency stability is ± 0.1ppm, can meet systematic survey demand.
Signal condition network includes multiple sendaisles, receiving channel, calibrated channel and passage agile device, each to send logical
Road includes wave filter, amplification or numerical-control attenuator, power divider.It is connected with accordingly in the input port of each sendaisle
Wave filter, for being filtered processing to signal.The signal connection that signal transacting composite signal generation module is produced is per all the way
The wave filter of input port in sendaisle, the output connection amplification of wave filter or numerical-control attenuator, are realized for signal power
Adjustment.The signal condition network being connected with signal transmitting module (including intermediate frequency multibeam signals and radio frequency multibeam signals) is each
The output end of individual sendaisle all contains one-to-two power divider, and the measurement that is used as all the way of power divider is exported, and connects tested
System, the multiple signals access passage agile device after system under test (SUT), wherein signal enters Measurement channel all the way for selection.Signal
One-level wave filter is first passed through, subsequently into, by second level wave filter, finally entering signal transacting group after amplification or numerical control attenuation
Close signal receiving module.Passage agile device is accessed in another road in signal condition network internal, for doing calibration signal, calibration letter
Number by calibrated channel entering signal handle combination signal receiving module.Signal as calibration is by amplification or numerical control attenuation
Enter wave filter after device, finally enter signal transacting composite signal receiving module.Passage agile device is according to the controls of blade computers
System instructs to allow corresponding sendaisle signal to be multiplexed into signal receiving module by the time-division.
Beneficial effect
Multichannel width phase test system structure of the present invention is simple, cost is low, and measurement accuracy is high；It can ensure that width phase measurement accuracy
Receiver internal thermal noise is limited solely by, without being influenceed by multi-access inference, and it is compatible with frequency, the parallel survey of non-same frequency wave beam
Examination；Virtual multichannel can be formed, receiving channel inconsistency, effectively reduction transmitting terminal self-inspection and school are reduced with time-division measurement
Test, receive the system complexity of measurement；Calibration method improves convenient, using regular off-line calibration and On-line self-diagnosis and the side of compensation
Formula eliminates the inconsistency of passage agile matrix, power splitter, DAC and wave filter；Width distributed mutually is configured and measurement accuracy is high,
It can reach power ± 0.1dB and phase ± 1 °；Measurement range is wide, can measure intermediate frequency and radio frequency beam Amplitude-phase relation；Can be real
The scalability of existing number of channels, need to only increase port number and the change of the transmission board of signal transacting composite signal sending module
Signal condition network, structure and increase processing complexity without changing receiving terminal；DAC fine tunings and signal condition net can be passed through
Network amplifies or two kinds of regulative modes of numerical control attenuation coarse adjustment realize transmission signal high precision, the regulation of Larger Dynamic scope；Directly lead to
The upper computer software crossed in blade computers can just realize a variety of functions, it is easy to operate.
Brief description of the drawings
Fig. 1 is the structural representation of multichannel width phase test system in the present invention；
Fig. 2 is the structural representation of multi channel signals generation module in the present invention；
Fig. 3 is multi-channel signal acquiring and the structural representation of analysis module in the present invention；
Fig. 4 is the structural representation of signal condition network in the present invention；
Fig. 5 is transmission and the calibrated channel of signal condition network in the present invention；
Fig. 6 is the receiving channel of signal condition network in the present invention.
Embodiment
The present invention will be further described with reference to the accompanying drawings and examples and is described in detail.
The invention provides a kind of multichannel width phase test system.The system can be according to user's request in upper computer software
Upper to set and produce the multi channel signals needed for user, multi channel signals access part to be measured after sendaisle, will be by treating
The multi channel signals surveyed after part take back multichannel width phase test system, the signal collection and analysis resume module by test system
Data are delivered into host computer afterwards and are further analyzed processing, width of the beam-forming network on feed battle array end face is completed and mutually surveys
Examination；Signal power can also be monitored in man-machine interface simultaneously, and realizes the functions such as alarm, record and preservation；And to each
Passage cable and itself sensor gain and phase uncertainties are calibrated.
Embodiment
A kind of multichannel width phase test system is provided in one embodiment of the invention.The system includes cabinet and position
In the test subject module in cabinet, it is easy to handling to transport.Referring to Fig. 1, it can be seen that the main body of test system is used from figure
Modularized design, including signal transmitting module, signal condition network, signal receiving module, frequency source module, PCIe backboards and
Blade computers.The upper computer software send configuration information and control instruction operated in blade computers is arrived by PCIe backboards
Up to signal transmitting module, control signal sending module produces the multi-beam width phase signals needed for user.Signal condition network will be believed
Number carry out analog filtering, amplification etc. and handle to obtain sendaisle signal, then input system under test (SUT).Multi-beam width phase signals are passed through
Reception signal is obtained after system under test (SUT) via signal condition network again.Signal receiving module is right under the control of blade computers
The multi-beam width phase signals of the process system under test (SUT) received are handled.Frequency source module is respectively receiving module and sends mould
Block provides homologous clock.Power module is powered for each subsystem of whole system.Under the collaborative work of all modules, this is
System can realize measurement function, function for monitoring, calibration function and software function.
Aforementioned four function is described separately below.
1) function is measured
Amplitude-phase relation for system under test (SUT) in tested end face is tested.
2) function for monitoring
The working condition of Supervisory Test Facility, operational factor, measurement result etc..
3) calibration function
Including off-line calibration (test before calibrate) and on-line calibration, be able to before testing calibrate system and
Real time calibration is carried out to test result when being tested.
4) software function
For above several functions, write corresponding upper computer software and realized.And there is software upgrading and secondary
Development function.
Below to the effect for each chief component for constituting the system, function is introduced respectively.
Signal processing module is core of the invention, and wherein signal transmitting module completes the signal transmitting and receiving of the system
Task, the upper computer software operated in blade computers can complete the operational control of test system and result is shown, state
The tasks such as instruction, such as import the spread spectrum code word and direction graph parameter of each wave beam for test system, configure each each passage of wave beam
Amplitude-phase relation etc..Signal processing module is mainly made up of signal transmitting module, signal receiving module and blade computers.
Upper computer software provides good man-machine interface, using advanced operating system, possesses abundant function, and can
To be updated at any time to test program.
Signal transmitting module, which includes sending, contains multiple high-speed A/D converters (DAC), Ke Yipei on board, every piece of board
Put synchronized transmission multi-beam width phase signals.Signal transmitting module structural representation in the present embodiment is as shown in Fig. 2 main by height
Performance FPGA and multiple high-speed DACs are constituted.The FPGA sent on board is complete by the instruction of PCIe interface reception blade computers
In pairs in each DAC configuration, and transmission meets the multi-beam width phase signals that user configures on host computer.
Signal receiving module includes one piece of board, and the work of all signal transactings is all concentrated on the board.The present embodiment
In signal receiving module structural representation it is as shown in Figure 3.Signal receiving module receives blade computers by PCIe backboards
Control command, control signal is sent to signal condition network, and control signal nurses one's health the passage agile device of network, selects some passage
As data acquisition analog-digital converter (ADC) input, and numerical control attenuation can be controlled so that input signal power processing is closed
Manage scope.Receiving end signal processing module carries out low pass sampling to intermediate-freuqncy signal, carries out bandpass sampling, Ran Houjin to radiofrequency signal
Row Digital Down Convert, digital matched filtering, spread spectrum phase acquisition, despreading and relative power/phase measurement.After being measured,
Test result is passed to blade computers by IF signal processing module by PCIe interface.
Frequency source module provides high-precision homologous clock for sending/receiving module.Due to requiring in multichannel width phase signals
Frequency it is very high when also meet phase accuracy index request, trickle clock jitter also results in phase accuracy divergence indicator
It is far.Therefore use the frequency source of specific customization and meet the clock of system requirements to provide.The frequency accuracy of frequency source and steady
Fixed degree is ± 0.1ppm.
Signal condition network includes multiple wave filters, numerical control attenuation, work(point and passage agile device etc., in the present embodiment
The general structure schematic diagram of signal condition network is as shown in Figure 4.Signal condition network be broadly divided into sendaisle, receiving channel and
Calibrated channel.Wherein send and calibrated channel is as shown in Figure 5.Sendaisle includes the bandpass filtering being connected with signal generator module
Device, amplification afterwards and numerical-control attenuator, second level bandpass filter and power divider.Power divider is 1 point of 2 work(point,
Wherein output connects system under test (SUT) all the way, is used as measurement signal, another road is linked into passage agile device, is used as calibration as shown in Figure 5
Signal.Passage agile device will select a sendaisle access calibrated channel, then access signal receiving module.Passage agile device
Amplification numerical control attenuation and bandpass filter afterwards constitutes calibrated channel.Receiving channel is as shown in Figure 6.System under test (SUT) will be passed through
First order wave filter after the passage agile device of measurement signal input signal conditioning network receiving terminal afterwards, passage agile device, puts
It is big with numerical-control attenuator and second level wave filter group is into receiving channel.Passage agile device selects system under test (SUT) input signal conditioning
The access Measurement channel of signal all the way in network, then accesses signal receiving module.
Upper computer software in blade computers easily control receiver module can nurse one's health network so as to control signal,
The decay of control signal, the switching of passage.Condition that can be as needed on upper computer software in measurement process is flexibly controlled
The corresponding function of signal condition real-time performance processed.
By the combination of modules above, the system can quickly and easily realize measurement function, function for monitoring with
And calibration function.
Described above is presently preferred embodiments of the present invention, and is not the restriction to embodiments of the present invention.It is right
For those of ordinary skill in the art, can also make on the basis of the above description other it is various forms of change and
Change.Here the embodiment having more can not be exhaustive.Every belong to that technical scheme amplifies out aobvious and
Row of the change or variation being clear to still in protection scope of the present invention.
Claims (3)
1. multichannel width phase test system, it is characterised in that：Including signal transacting composite module, frequency source module, signal condition
Network and power module；Wherein, signal transacting composite module includes signal transmitting module, signal receiving module, PCIe backboards, knife
Piece computer；
The annexation of above-mentioned part is：Blade computers receive mould by PCIe backboards and signal transmitting module, signal
Block is interconnected；Power module is respectively connecting to signal transacting combination, signal condition network and frequency source module；Signal transmitting module
With signal condition network interconnection；Signal receiving module is connected with signal condition network, and signal condition network is interconnected with measured piece；Frequently
Rate source module is connected with signal transacting composite module；
Workflow is：Blade computers, to sending module, control hair by PCIe backboard send configuration information and control instruction
Send module to produce the multibeam signals needed for user, send to signal condition network；Signal condition network enters multibeam signals
Row analog filtering, enhanced processing obtain sendaisle signal, then input system under test (SUT)；Multibeam signals pass through system under test (SUT)
Afterwards, then via signal condition network receiving module is back to, obtains receiving signal；Receiving module is under the control of blade computers
The docking collection of letters is handled；Frequency source module is respectively that receiving module and sending module provide homologous clock；
Signal transacting composite module completes configuration, generation, transmission, reception and the processing of multi-beam width phase signals；Described is more
Wave beam width phase signals are a DS CDMA signals modulated by binary phase shift keying, including intermediate frequency is more
Wave beam width phase signals and radio frequency multi-beam width phase signals；
Blade computers provide man-machine interface, the state of whole test system can be monitored in real time, and test data is entered in real time
Row updates；By the upper computer software in blade computers can be needed according to user configure multi-beam width phase signals amplitude,
Phase information；
Signal transmitting module includes transmission board polylith parallel, sends board and is connected with PCIe backplane interfaces, every piece of board
Receive the instruction that blade computers send and complete configuration, can produce and send meet that user configures in blade computers many
Wave beam width phase signals；
Signal receiving module includes one piece of board, connects multiple receiving channels as input, concentrates and carry out after signal transacting all the way
Output；Signal receiving module receives the instruction of blade computers, and control signal nurses one's health the passage agile device of network, selection wherein one
Individual receiving channel as signal receiving module input；Signal receiving module centering frequency multi-channel width phase signals carry out low pass and adopted
Sample, to radio frequency multichannel width phase signals carry out bandpass sampling, then carry out Digital Down Convert, digital matched filtering, spread spectrum code-phase
Position capture, despreading, relative power and phase measurement；After being measured, signal receiving module will be measured by PCIe backplane interfaces
As a result blade computers are passed to, and is further processed, shows in blade computers；
Signal condition network includes multiple sendaisles, receiving channel, calibrated channel and passage agile device, each sendaisle bag
Include wave filter, amplification or numerical-control attenuator, power divider；Corresponding filter is connected with the input port of each sendaisle
Ripple device, for being filtered processing to signal；The signal connection of signal transacting composite signal generation module generation is every to be sent all the way
The wave filter of input port in passage, the output connection amplification of wave filter or numerical-control attenuator, realize the tune for signal power
It is whole；The output end for signal condition network each sendaisle being connected with signal transmitting module all contains one-to-two power distribution
Device, the measurement that is used as all the way of power divider is exported, and connects system under test (SUT), and the multiple signals access passage after system under test (SUT) is prompt
Become device, wherein signal enters Measurement channel all the way for selection；Signal first passes through one-level wave filter, subsequently into amplification or numerical control attenuation
Afterwards by second level wave filter, signal transacting composite signal receiving module is finally entered；Another road is in signal condition network internal
Passage agile device is accessed, for doing calibration signal, the signal that the calibration signal handles combination by calibrated channel entering signal connects
Receive module；Signal as calibration enters wave filter after amplification or numerical-control attenuator, finally enters signal transacting combination letter
Number receiving module；Passage agile device allows corresponding sendaisle signal according to the control instruction of blade computers by time division multiplexing
Entering signal receiving module.
2. multichannel width phase test system according to claim 1, it is characterised in that：The transmission of signal transacting composite module
Module and receiving module complete the signal transmitting and receiving task of the system, and blade computers complete operational control and the knot of test system
Fruit display, state instruction, are spread spectrum code word and direction graph parameter that multichannel width phase test system imports each wave beam, configure each ripple
The Amplitude-phase relation of beam.
3. multichannel width phase test system according to claim 1, it is characterised in that：Using the frequency source of customization, frequency
Accuracy and frequency stability are ± 0.1ppm.
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| CN106896276A (en) * | 2017-02-28 | 2017-06-27 | 成都菲斯洛克电子技术有限公司 | A kind of near field test system |
| CN107480085A (en) * | 2017-07-31 | 2017-12-15 | 成都普诺科技有限公司 | Multiplex roles integrated test system |
| CN107807354A (en) * | 2017-09-28 | 2018-03-16 | 哈尔滨工程大学 | A kind of multipurpose passage consistency measuring system |
| CN108020821B (en) * | 2017-12-27 | 2021-06-08 | 成都锐芯盛通电子科技有限公司 | Phased array radar antenna beam control circuit detection system and implementation method thereof |
| CN108322273B (en) * | 2018-01-10 | 2020-11-10 | 北京哨兵科技有限公司 | Ground test equipment for flight data chain |
| CN110031811B (en) * | 2019-05-13 | 2022-11-18 | 成都天奥技术发展有限公司 | Multichannel broadband signal coherent characteristic rapid calibration system |
| CN111585606B (en) * | 2020-03-25 | 2021-03-26 | 北京理工大学 | Coherent FFH/DS mixed spread spectrum system |
| CN112698137B (en) * | 2020-12-24 | 2024-03-26 | 陕西华达科技股份有限公司 | Method and system for testing consistency of amplitude and phase along with temperature variation |
| CN112804014B (en) * | 2020-12-28 | 2023-01-31 | 上海创远仪器技术股份有限公司 | Method for realizing high-power range precision calibration of port power for vector network analyzer |
| CN113447728A (en) * | 2021-06-01 | 2021-09-28 | 广州中雷电科科技有限公司 | Amplitude-phase adjustable power divider for passive antenna test and control calibration method |
| CN114325156A (en) * | 2021-11-22 | 2022-04-12 | 惠州市德赛西威汽车电子股份有限公司 | System and method for testing multiplex signals sent out by vehicle-mounted instrument |
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