CN110031811A - The quickly calibrated system of multi-channel wide band signal coherent characteristic - Google Patents
The quickly calibrated system of multi-channel wide band signal coherent characteristic Download PDFInfo
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- CN110031811A CN110031811A CN201910391423.3A CN201910391423A CN110031811A CN 110031811 A CN110031811 A CN 110031811A CN 201910391423 A CN201910391423 A CN 201910391423A CN 110031811 A CN110031811 A CN 110031811A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
- G01S7/4004—Means for monitoring or calibrating of parts of a radar system
- G01S7/4021—Means for monitoring or calibrating of parts of a radar system of receivers
Abstract
A kind of quick on-line calibration system of multi-channel wide band signal coherent characteristic disclosed by the invention, it is intended to Solving Multichannel, high-precision, the coherent characteristic calibration problem of broadband and Larger Dynamic coherent signal.The technical scheme is that: clock/triggering distribution module adopts & Signal transacting board analysis by frequency dividing/frequency multiplication locking phase for radio-frequency front-end & signal conditioning module, multichannel number and provides down coversion clock, acquisition clock and trigger signal；By the combination of multiple groups RF switch by the quick tested coherent signal timesharing switching output for traversing measurement to radio-frequency front-end & signal conditioning module, to coherent feature measurement after the multiple frequency conversion of radiofrequency signal is decayed or is amplified；The calibration of itself amplitude channels Sensor gain and phase perturbations and reporting for system under test (SUT) coherent feature measurement and calibration value are completed by the state machine that embedded software is realized, binding signal is switched fast access and the assembly line calibration process based on state machine, realizes the online quickly calibrated of multi-channel wide band signal coherent characteristic.
Description
Technical field
The present invention relates to a kind of measurement and calibration devices of Radio Measurements field phase parameter, more specifically, the present invention
Be related to it is a kind of be mainly used for realizing it is quickly calibrated to the coherent characteristic of multichannel, high-precision, broadband and Larger Dynamic coherent signal
System.
Background technique
Under the fast-developing background of the technologies such as communication, radar, especially multichannel communication, multiple-input and multiple-output (MIMO)
In the research and development of the electronic product equipments such as communication, DF and location radar, phased-array radar, production process, to multichannel communication equipment,
The requirement of especially Multi-channel signal generator is higher and higher.Not only need signal source can generate simultaneously multiple channels it is identical or
Different signal types, and require each interchannel of signal source that there is certain phase relation, it is mainly used for test communication, thunder
Up to the performance of the products such as coherent characteristic, test multichannel communication, radar between each channel of equal output of products.And it is above-mentioned this
A little application scenarios, the traditional signal generator are unable to satisfy testing requirement.In order to guarantee that the test of multichannel coherent target simulator is more
The indexs such as direction finding, the positioning of receiver system it is accurate and reliable, be largely used to test multi-receiver system multichannel coherent mesh
The coherent characteristic of simulator, i.e. phase equalization between certain time range internal channel are marked, variation influenced by ambient temperature is bright
It is aobvious, it need to be completed in a short time calibration, coherent characteristic has to pass through calibration and traces to the source.Due to such multichannel coherent target simulation
Device has tens channels output (channel is more), inter-channel phase consistency less than 1 ° (coherent precision is high), highest frequency to 20GHz
(wide frequency range), minimum signal -60dBm (dynamic is big), so that the existing calibration system based on all purpose instrument (all passes through
Oscillograph, net point or number are adopted and are built) cannot achieve lower cost tens channel high-precision coherent characteristics quickly calibrated, and school
Barebone itself can not trace to the source, and chain of tracing to the source is imperfect.And the coherent characteristic calibration system based on oscillograph, due to being limited to ADC
Digit and itself bottom are made an uproar height, and test dynamic range is small, and phase measurement accuracy is low.Test macro based on high-end vector net point
Meet calibration requirements of the inter-channel phase consistency less than 1 °, local oscillator can not be total to by being limited to more arrow nets, can only at most support 4
The calibration of channel coherent target simulator coherent characteristic.Although being adopted based on more number of units, the calibration system of low-converter and intermediate frequency conditioning
System, precision are able to satisfy requirement, stack by instrument and realize that multichannel coherent receives, but with the increasing of target simulator number of channels
Add, system extension is at high cost, volume is big, and calibration system does not carry out measurable design, can only utilize the higher multichannel of precision
Coherent signal generator traces to the source single channel signal progress function point generation coherent signal.
Existing multi-channel high-accuracy coherent characteristic test system, coherent signal generator due to a lack of higher precision and logical
The power splitter in tens good channels of trace consistency, can not measure, and result in tracing to the source for multi-channel high-accuracy coherent characteristic calibration
Chain is imperfect.
Summary of the invention
In place of in view of the shortcomings of the prior art, a kind of precision height, easily extension, cost are provided
Low, calibration is fast, the good quick on-line calibration system of multi-channel wide band signal coherent characteristic of phase equalization, to solve to answer at present
The coherent characteristic calibration of multichannel coherent target simulator for field of radar test multi-receiver system, and can solve other
Associated multi-channel, high-precision, the coherent characteristic calibration problem of broadband and Larger Dynamic coherent signal in field.
Above-mentioned purpose of the invention can be achieved by following technical proposals: a kind of multi-channel wide band signal coherent
The quick on-line calibration system of characteristic, comprising: the radio-frequency switch module and its signal interconnected by Ethernet with industrial personal computer is quickly cut
Change channel, radio-frequency front-end & signal conditioning module, multichannel number adopt & Signal transacting board analysis and clock/triggering distribution module, special
Sign is that it is radio frequency that high stability crystal oscillator is transformed to high steady 10MHz output by frequency dividing/frequency multiplication locking phase by clock/triggering distribution module
Front end & signal conditioning module, multichannel number adopt & Signal transacting board analysis and provide down coversion clock, acquisition clock and trigger signal, real
Now variable frequency clock, acquisition clock are synchronous with triggering；Signal is switched fast the combination by multiple groups RF switch in channel, will
Quickly the tested channel coherent radiofrequency signal timesharing switching output of traversal measurement is to radio-frequency front-end & signal conditioning module, by radio frequency
Signal is repeatedly converted to intermediate frequency, then after intermediate-freuqncy signal is decayed or amplified, and is sent into multichannel number and adopts Signal transacting board analysis pair
Coherent feature measurement；Industrial personal computer completes the school of itself amplitude channels Sensor gain and phase perturbations by the state machine of built-in software realization
Quasi- and system under test (SUT) coherent feature measurement, and reporting for calibration value is completed by Ethernet, binding signal be switched fast access with
Assembly line based on state machine calibrates process, realizes the online quickly calibrated of multi-channel wide band signal coherent characteristic.
The present invention has the following beneficial effects: compared with the prior art
It easily extends, is at low cost.The present invention is switched fast the combination that channel passes through multiple groups RF switch, and tested multichannel coherent is believed
Number timesharing output realizes that the quick traversal of multi channel signals coherent characteristic measures with a small amount of acquisition measurement port, and realization is tested
Signal is switched fast, and reduces measurement cost, and when calibration system needs support the test of more multichannel, only needs to change letter
Number it is switched fast channel, increases the extended capability in channel, extension is easy, and is extended at low cost.Overcoming the prior art will rely on
In the stacking of hardware, defect at high cost.
Phase equalization is good, and calibration is fast, and precision is high.The present invention is total to local oscillator design, down coversion using radio-frequency front-end down coversion
Clock, acquisition clock, which are surveyed with the Synchronization Design of triggering with frequency domain, mutually realizes coherent feature measurement, maintains the coherent of measured signal
Characteristic, to realize that the high-acruracy survey of coherent characteristic provides guarantee；The accountability of use designs, and ensure that chain of tracing to the source is complete
Property.It is designed by radio-frequency front-end & signal conditioning module and multichannel number using channel independent parallel, binding signal is switched fast logical
Road and assembly line based on state machine calibrate process, realize the quickly calibrated of multichannel coherent characteristic, are further coherent characteristic
High-precision calibration provide guarantee；The coherent measurement accuracy of this calibration system is set to be increased to 0.5 °, than existing coherent test macro
Precision is higher (up to 1 °).
Measurable, chain of tracing to the source is complete.The accountability of use designs, and ensure that chain integrality of tracing to the source.It avoids existing
Multi-channel high-accuracy coherent characteristic test system, the higher precision coherent signal generator due to a lack of higher precision are consistent with channel
Property good tens channels power splitter, can not measure, the chain of tracing to the source for resulting in the calibration of multi-channel high-accuracy coherent characteristic is endless
Whole deficiency.The present invention carries out measurable design using the thought that intermediate frequency is traced to the source, and is built in multichannel number and adopts & Signal transacting board analysis
The dismountable phase alignment box based on air line in cabinet is logical by air line in replacement phase alignment box and two, cable
Road measures phase of each access relative to reference path respectively, and each channel phase consistency is traced to the source to the sky of phase alignment box
The phase equalization of the phase equalization of two accesses of gas line and cable, two accesses of air line and cable can trace to the source to national base
Standard, so that tracing to the source for calibration system coherent characteristic is realized, to realize that the chain of completely tracing to the source of multichannel coherent target simulator provides
Guarantee.Solves the coherent characteristic at present applied to the multichannel coherent target simulator of field of radar test multi-receiver system
Calibration, and the coherent characteristic calibration of associated multi-channel in other fields, high-precision, broadband and Larger Dynamic coherent signal can be solved
Problem.
Task of the invention is both daily measurement verification and transmission of quantity value requirements of one's work and system engineering to multi-pass
The important leverage of the general character measurement problem of road coherent characteristic index test.
Detailed description of the invention
This method is further illustrated with reference to the accompanying drawings and examples.
Fig. 1 quick on-line calibration system of multi-channel wide band signal coherent characteristic of the present invention at schematic diagram.
Fig. 2 is that Fig. 1 signal is switched fast channel schematic illustration.
Fig. 3 is the circuit theory schematic diagram of Fig. 1 radio-frequency front-end & signal conditioning module.
Fig. 4 is that frequency domain built in Fig. 1 Signal transacting board analysis surveys phase flow diagram.
Fig. 5 is embodiment schematic diagram of the Fig. 1 to industrial personal computer built-in state machine.
Fig. 6 is the process intention for measuring the quickly calibrated system of multi-channel wide band signal coherent characteristic.
Specific embodiment
Refering to fig. 1.In a most preferred embodiment described below, a kind of multi-channel wide band signal coherent characteristic is quick
On-line calibration system, comprising: before the radio-frequency switch module signal being connected by Ethernet with industrial personal computer is switched fast channel, radio frequency
End & signal conditioning module, multichannel number adopt & Signal transacting board analysis and clock/triggering distribution module, wherein multichannel number adopts & letter
The dismountable phase alignment box based on air line built in number processing board card machine case, phase alignment box is by air line and cable group
At by switching as signal formation two selectable accesses of air line and cable.Pass through the air in replacement phase alignment box
Two accesses of line and cable, measure phase of each access relative to reference path respectively, by each channel phase consistency trace to the source to
The phase equalization of two accesses of air line and cable of phase alignment box.Clock/triggering distribution module passes through frequency dividing/frequency multiplication lock
High stability crystal oscillator is mutually transformed to high steady 10MHz output, adopts & signal-processing board for radio-frequency front-end & signal conditioning module, multichannel number
Card provides down coversion clock, acquisition clock and trigger signal, realizes that down coversion clock, acquisition clock are synchronous with triggering；Signal
It is switched fast the combination that channel passes through multiple groups RF switch, extremely by the tested coherent signal timesharing switching output of quick traversal measurement
Radiofrequency signal is repeatedly converted to intermediate frequency by radio-frequency front-end signal conditioning module, then after intermediate-freuqncy signal is decayed or amplified,
It is sent into multichannel number and adopts & Signal transacting board analysis to coherent feature measurement；Industrial personal computer is complete by the state machine of built-in software realization
Calibration and system under test (SUT) coherent feature measurement at itself amplitude channels Sensor gain and phase perturbations, and calibration value is completed by Ethernet
Report, binding signal be switched fast access and based on state machine assembly line calibration process, realize multi-channel wide band signal
Coherent characteristic it is online quickly calibrated.And accountability design is carried out to calibration system, & Signal transacting board analysis is adopted in multichannel number
The detachable calibration box based on air line and cable of interpolation before channel 1, when calibration, replace the air in phase alignment box respectively
Two accesses of line and cable, then phase of each access relative to reference path is measured, each channel phase consistency is traced to the source to phase
The phase equalization of two accesses of air line and cable of position calibration box, the phase equalization of two accesses of air line and cable can
It traces to the source to National primary standard, to realize tracing to the source for calibration system coherent characteristic.
Tested channel coherent radiofrequency signal is switched fast channel by signal and adopts & Signal transacting board analysis experience to multichannel number
The process that signal behavior, down coversion, conditioning, acquisition, storage, phase equalization measurement, measurement report, by industry control machine platform
The pipeline state machine of realization is controlled by Ethernet and is completed.Down coversion clock, the multichannel of radio-frequency front-end & signal conditioning module
The steady clock signal of height that number adopts the acquisition clock of & Signal transacting board analysis and triggering is generated by clock/triggering distribution module uniformly mentions
For.
Tested coherent signal can be 28 channel coherent radiofrequency signals.
28 tested channel coherent radiofrequency signals through signal are switched fast channel timesharing, and to be converted into 4 channel radio frequency signals defeated
Out, four-way radiofrequency signal inputs to radio-frequency front-end & signal conditioning module, radio-frequency front-end & signal condition by isometric phase-compensated cable
After module is to four-way radiofrequency signal parallel independent down coversion, decaying, amplification conditioning, output level four-way intermediate-freuqncy signal, four
Channel intermediate-freuqncy signal inputs to multichannel number by isometric phase-compensated cable and adopts & Signal transacting board analysis, and multichannel number adopts & signal-processing board
Insertion phase calibration box before card channel 1 inputs.Phase alignment box is inserted in multichannel number and adopts between 1 channel of input, daily test
Phase alignment box uses cable through when use, and when only tracing to the source calibration system, phase alignment box just uses air line
Access.Multichannel number adopts & Signal transacting board analysis and completes the parallel independent acquisition of four-way intermediate-freuqncy signal and realize FFT again after storing
Digital Signal Processing is converted, phase equalization measurement is finally completed.
In the embodiment of Fig. 2 description, it includes: to provide 28 channels to be input to 4 channel outputting cuttings that signal, which is switched fast channel,
Transducing power, the 5 throw switch group of 1-6 hilted broadsword that frequency range is 10MHz~20GHz, wherein input channel 1 is logical for reference signal
The straight-through output in road, remaining 27 input channel signal divide two-stage to complete 3 by 65 throw switches of hilted broadsword under control of the control signal
The selection of a channel signal exports, and 9 switchings for being input to 1 output are realized in 15 throw switch of hilted broadsword and 15 throw switch of hilted broadsword combination
Function realizes 3 group of 9 signal switched path for being input to 1 output altogether.The switching toggle of 65 throw switches of hilted broadsword is by coming from industrial personal computer
Control signal controlled.
In the embodiment of Fig. 3 description, radio-frequency front-end signal conditioning module include: containing local vibration source generation module and
The wideband frequency unit of one point of four power splitter, the converter unit with four-way input and the signal condition with four-way output
Unit, wherein converter unit includes the identical down conversion module of four structures, and signal conditioning unit includes that four structures are identical again
Signal conditioning module.The local vibration source that down coversion clock inputs to wideband frequency unit is generated mould by clock/triggering distribution module
Block, the wideband sine wave signal of reference frequency output 1.3GHz~20GHz after local vibration source generation module, then wideband sine is believed
Number being divided into four road local oscillation signals through one point of four power splitter again exports to converter unit, realizes the total local oscillator of frequency conversion.10MHz~
20GHz, 0dBm~-60dBm four-way input radio frequency signal four down conversion module independent parallels through converter unit respectively
Down coversion, output four road 10MHz~600MHz, 0dBm~-60dBm intermediate-freuqncy signal after frequency conversion, four road 10MHz~
600MHz, 0dBm~-60dBm intermediate-freuqncy signal and four signal conditioning module independent parallel signal tune through signal conditioning unit
The signal output of tetra- road 10MHz~600MHz of Li Cheng, 0dBm.
In the embodiment of Fig. 4 description, Signal transacting board analysis surveys phase algorithm using frequency domain and is multiplied to measured signal；Altogether
Conjugate data truncation, carries out Spectrum Correction after completing FFT transform, by finding spectrum maximum point, extracts the phase of spectrum maximum
Information obtains phase measurement, completes phase measurement.
In the embodiment of Fig. 5 description, multi-channel wideband signal coherent characteristic one channel phase of quickly calibrated systematic survey
Bit integrity measurement procedure is followed successively by down coversion, conditioning, acquisition, storage, measures and report, wherein down coversion, conditioning, acquisition,
Storage is measured and is reported by software realization, time-consuming t by hardware realization.The measurement of 28 channel phase consistencies uses pipeline organization,
The phase equalization in channel 2~28 measures, altogether time-consuming 5t.Firstly, at 0 moment, signal be switched fast channel elder generation selector channel 2,
3,4 and channel 1 export, start Measurement channel 2,3,4 phase equalization；When channel, 2,3,4 phase equalization measurement is entered
When Stored Procedure, signal is switched fast the output of channel selecting channel 5,6,7 and 1, and the phase for starting Measurement channel 5,6,7 is consistent
Property；When channel, 5,6,7 phase equalization measurement enters Stored Procedure, 2,3,4 phase equalization of channel, which is measured, to be reported,
Signal is switched fast the output of channel selecting channel 8,9,10 and 1, starts the phase equalization of Measurement channel 8,9,10；When channel 8,
9, when 10 phase equalization measurements enter Stored Procedure, 5,6,7 phase equalization of channel, which is measured, to be reported, and signal is quickly cut
It changes channel selecting channel 11,12,13 and channel 1 to export, starts the phase equalization of Measurement channel 11,12,13；When channel 11,
12, when 13 phase equalization measurements enter Stored Procedure, 8,9,10 phase equalization of channel, which is measured, to be reported, and 14,15,16
It is exported with channel 1, starts the phase equalization of Measurement channel 14,15,16；Enter when 14,15,16 phase equalization of channel measures
When to Stored Procedure, 11,12,13 phase equalization of channel, which is measured, to be reported, signal be switched fast channel selecting channel 17,
18,19 and channel 1 export, start Measurement channel 17,18,19 phase equalization；When 17,18,19 phase equalization of channel is surveyed
When amount enters Stored Procedure, 14,15,16 phase equalization of channel, which is measured, to be reported, and it is logical that signal is switched fast channel selecting
Road 20,21,22 and channel 1 export, and start the phase equalization of Measurement channel 20,21,22；When channel, 20,21,22 phase is consistent
Property measurement when entering Stored Procedure, 17,18,19 phase equalization of channel, which is measured, to be reported, and signal is switched fast channel choosing
It selects channel 23,24,25 and channel 1 exports, start the phase equalization of Measurement channel 23,24,25；When 23,24,25 phase of channel
When coherence measurement enters Stored Procedure, 20,21,22 phase equalization of channel, which is measured, to be reported, and signal is switched fast logical
Road selector channel 26,27,28 and channel 1 export, and start the phase equalization of Measurement channel 26,27,28；When channel 26,27,28
When phase equalization measurement enters Stored Procedure, 23,24,25 phase equalization of channel, which is measured, to be reported；At the 5t moment, lead to
26,27,28 phase equalization of road, which is measured, to be reported, and 28 channel coherent feature measurements are completed.
Fig. 6 description embodiment in, measure the quickly calibrated system of multi-channel wide band signal coherent characteristic process according to
It is secondary are as follows: step 1-takes out phase alignment box from the cabinet that the multichannel number of calibration system adopts & Signal transacting board analysis, send to
Metering institute, China, the phase difference ΔΦ 0 to air line passage relative to cable passage are traced to the source；After the completion of step 2-is traced to the source
Phase alignment box is accessed multichannel number again to adopt in the cabinet of & Signal transacting board analysis；Step 3-is by the isometric electricity of signal source
Input 1 channel and x, x+1, x+2 channel of the cable through one point four of power splitter access calibration system, x=2, and by phase alignment box
It is placed in cable passage state；Step 4-measures the channel x, x+1, x+2 to the phase Φ i of reference channel 1；Step 5-is by phase school
Quasi- box is placed in air line channel status, phase Φ n of the measurement channel x, x+1, x+2 to reference channel 1；Step 6-compare Φ n with
The difference of Φ i obtains ΔΦ m, and the standard value of ΔΦ m is ΔΦ 0, to realize that x, x+1, x+2 channel phase consistency are traced to the source；Step
Rapid 7-judge x > 28；If step 7 "Yes", process terminate, the quickly calibrated system meters of multi-channel wide band signal coherent characteristic
It traces to the source completion；If step 7 "No", enters step 8-1 channels of holding input and connect constant, x=x+2, replacement is connected to x, x+
1, the channel x+2, x=x+2.Phase alignment box is placed in cable passage state；Step 4 is recycled to after step 8 is complete again.
It is to be understood, however, that embodiments disclosed herein is only typical example of the invention, it can
It is presented as various forms.Therefore, the detail disclosed here is not to be considered as limiting, and is merely possible to claim
Basis and as of the invention for instructing those skilled in the art differently to apply in any appropriate mode in practice
Representative basis, including the feature that may do not disclosed clearly here using various features described herein and combination.?
Under creative ideas of the invention, those skilled in the art can make various changes and improve to above structure and material, including
Here individually disclosure or the combination of claimed technical characteristic, it will be apparent that other combinations including these features.These deformations
And/or combination is each fallen in technical field according to the present invention, and falls into the protection scope of the claims in the present invention.
Claims (10)
1. a kind of quick on-line calibration system of multi-channel wide band signal coherent characteristic, comprising: mutual with industrial personal computer by Ethernet
Radio-frequency switch module signal even is switched fast channel, radio-frequency front-end & signal conditioning module, multichannel number adopt & signal-processing board
Card and clock/triggering distribution module, which is characterized in that clock/triggering distribution module passes through frequency dividing/frequency multiplication locking phase for high stability crystal oscillator
It is transformed to high steady 10MHz output, & Signal transacting board analysis is adopted for radio-frequency front-end & signal conditioning module, multichannel number and down coversion is provided
Clock, acquisition clock and trigger signal realize that down coversion clock, acquisition clock are synchronous with triggering；Signal is switched fast channel
The combination by multiple groups RF switch, will quick traversal measurement tested coherent signal timesharing switching output to radio-frequency front-end &
Radiofrequency signal is repeatedly converted to intermediate frequency by signal conditioning module, then after intermediate-freuqncy signal is decayed or amplified, and is sent into multichannel
Number adopts & Signal transacting board analysis to coherent feature measurement；Industrial personal computer completes itself amplitude by the state machine of built-in software realization
The calibration of channel phases inconsistency and system under test (SUT) coherent feature measurement, and reporting for calibration value is completed by Ethernet, it ties
It closes signal and is switched fast access and the assembly line calibration process based on state machine, realize multi-channel wide band signal coherent characteristic
It is online quickly calibrated.
2. the quick on-line calibration system of multi-channel wide band signal coherent characteristic as described in claim 1, it is characterised in that: quilt
Survey channel coherent radiofrequency signal by signal be switched fast channel to multichannel number adopt & Signal transacting board analysis undergo signal behavior,
The process that down coversion, conditioning, acquisition, storage, phase equalization measurement and measurement report, by the stream realized on industry control machine platform
Waterline state machine is controlled by Ethernet and is completed.
3. the quick on-line calibration system of multi-channel wide band signal coherent characteristic as claimed in claim 2, it is characterised in that: penetrate
Down coversion clock, the multichannel number of frequency front end & signal conditioning module adopt & Signal transacting board analysis acquisition clock and triggering by when
The steady clock signal of the height that clock/triggering distribution module generates is unified to be provided.
4. the quick on-line calibration system of multi-channel wide band signal coherent characteristic as claimed in claim 3, it is characterised in that: quilt
Surveying coherent signal is 28 channel coherent radiofrequency signals, and 28 tested channel coherent radiofrequency signals are switched fast channel timesharing through signal
It is converted into the output of four-way radiofrequency signal, four-way radiofrequency signal inputs to radio-frequency front-end & signal condition by isometric phase-compensated cable
Module.
5. the quick on-line calibration system of multi-channel wide band signal coherent characteristic as claimed in claim 5, it is characterised in that: penetrate
After frequency front end & signal conditioning module is to four-way radiofrequency signal parallel independent down coversion, decaying, amplification conditioning, output level four
Channel intermediate-freuqncy signal, four-way intermediate-freuqncy signal input to multichannel number by isometric phase-compensated cable and adopt & Signal transacting board analysis, multichannel
Number adopts insertion phase calibration box before signal-processing board card channel 1 inputs.
6. the quick on-line calibration system of multi-channel wide band signal coherent characteristic as claimed in claim 6, it is characterised in that: phase
Position calibration box is inserted in multichannel number and adopts between 1 channel of input, and phase alignment box uses cable through when daily test uses, only
Have that when tracing to the source calibration system, phase alignment box just uses air line access.
7. the quick on-line calibration system of multi-channel wide band signal coherent characteristic as described in claim 1, it is characterised in that: more
Port number adopts & Signal transacting board analysis and completes the parallel independent acquisition of four-way intermediate-freuqncy signal and realize that fast Fourier becomes again after storing
FFT transform Digital Signal Processing is changed, phase equalization measurement is finally completed.
8. the quick on-line calibration system of multi-channel wide band signal coherent characteristic as described in claim 1, it is characterised in that: letter
Number being switched fast channel includes: to provide that 28 channels are input to 4 channels output switching capability, frequency range is 10MHz~20GHz
1-6 5 throw switch group of hilted broadsword, wherein input channel 1 is the straight-through output of reference channel signal, remaining 27 input channel signal
It is exported under control of the control signal by the selection that 65 throw switches of hilted broadsword divide two-stage to complete 3 channel signals, 1 hilted broadsword 5 is thrown
9 handoff functionalities for being input to 1 output are realized in switch and 15 throw switch of hilted broadsword combination, realize 3 group of 9 letter for being input to 1 output altogether
Number switched path, and the switching toggle of 65 throw switches of hilted broadsword is controlled by the control signal from industrial personal computer.
9. the quick on-line calibration system of multi-channel wide band signal coherent characteristic as described in claim 1, it is characterised in that:
0 moment, signal are switched fast channel elder generation selector channel 2,3,4 and channel 1 and export, and the phase for starting Measurement channel 2,3,4 is consistent
Property；When channel, 2,3,4 phase equalization measurement enters Stored Procedure, signal is switched fast channel selecting channel 5,6,7 and 1
Output starts the phase equalization of Measurement channel 5,6,7；When channel, 5,6,7 phase equalization measurement enters Stored Procedure,
2,3,4 phase equalization of channel, which is measured, to be reported, and signal is switched fast the output of channel selecting channel 8,9,10 and 1, starts to survey
Measure the phase equalization in channel 8,9,10；When channel, 8,9,10 phase equalization measurement enters Stored Procedure, channel 5,6,7
Phase equalization, which is measured, to be reported, and signal is switched fast channel selecting channel 11,12,13 and channel 1 and exports, and it is logical to start measurement
The phase equalization in road 11,12,13；When channel, 11,12,13 phase equalization measurement enters Stored Procedure, channel 8,9,
10 phase equalizations, which are measured, to be reported, 14,15,16 and channel 1 export, start Measurement channel 14,15,16 phase it is consistent
Property；When channel, 14,15,16 phase equalization measurement enters Stored Procedure, 11,12,13 phase equalization of channel has been measured
At reporting, signal is switched fast channel selecting channel 17,18,19 and channel 1 and exports, and starts the phase of Measurement channel 17,18,19
Consistency；When channel, 17,18,19 phase equalization measurement enters Stored Procedure, 14,15,16 phase equalization of channel is surveyed
Amount is completed to report, and signal is switched fast channel selecting channel 20,21,22 and channel 1 and exports, and starts Measurement channel 20,21,22
Phase equalization；When channel, 20,21,22 phase equalization measurement enters Stored Procedure, 17,18,19 phase of channel is consistent
Property be measured and report, signal is switched fast channel selecting channel 23,24,25 and channel 1 exports, start Measurement channel 23,24,
25 phase equalization；When channel, 23,24,25 phase equalization measurement enters Stored Procedure, 20,21,22 phase of channel
Coherence measurement completion reports, and signal is switched fast channel selecting channel 26,27,28 and channel 1 and exports, and starts Measurement channel
26,27,28 phase equalization；When channel, 26,27,28 phase equalization measurement enters Stored Procedure, channel 23,24,
25 phase equalizations, which are measured, to be reported；At the 5t moment, 26,27,28 phase equalization of channel, which is measured, to be reported, 28 channel phases
Join feature measurement to complete.
10. the quick on-line calibration system of multi-channel wide band signal coherent characteristic as described in claim 1, it is characterised in that:
Input 1 channel and x, x+1, x+2 channel of the signal source through one point four of power splitter access calibration system, x=2, and by phase school
Quasi- box is placed in cable passage state；The channel x, x+1, x+2 is measured to the phase Φ i of reference channel 1；Phase alignment box is placed in air
Line passage state, phase Φ n of the measurement channel x, x+1, x+2 to reference channel 1；The difference for comparing Φ n and Φ i obtains ΔΦ m,
The standard value of ΔΦ m is ΔΦ 0, to realize that x, x+1, x+2 channel phase consistency are traced to the source；Then judge x > 28；If
"Yes", process terminate, and complete metering and trace to the source；If "No", keep input 1 channel connect constant, x=x+2, replacement be connected to x,
Phase alignment box is placed in cable passage state by the channel x+1, x+2, x=x+2；Measurement x, x+1, x+ are recycled to after step 8 is complete again
Phase Φ i of 2 channels to reference channel 1.
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