CN105846916B - A kind of time-delay calibration device and method towards coherent vector signal generation system - Google Patents
A kind of time-delay calibration device and method towards coherent vector signal generation system Download PDFInfo
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Abstract
The invention discloses a kind of time-delay calibration device and method towards coherent vector signal generation system, by oscillograph edge to edge time measurement function, obtains the time delay between each coherent signal output channel and reference channel and compensation；Then utilize the phase difference and instantaneous frequency of each coherent linear FM signal beginning and end opening position of oscilloscope measurement, equation is formed using the relation between linear FM signal time delay and phase difference, instantaneous frequency, the precise delay that is calculated between each coherent signal output channel and reference channel simultaneously controls compensation, so as to complete the time-delay calibration of the interchannel of coherent vector signal generation system.
Description
Technical field
The invention belongs to coherent signal generation system collimation technique field, more specifically, is related to a kind of towards coherent
The interchannel time delay accurate calibration device and method of vector signal generation system.
Background technology
Coherent vector signal generation system is a kind of multi-channel radio frequency coherent signal generation system, and the system has multiple penetrate
Frequency signal output channels, can produce multichannel coherent radiofrequency signal, and the frequency of each road signal is consistent, phase coherent, time delay and amplitude
It is controllable；Coherent vector signal generation system can produce various types of coherent signals, such as coherent digital modulated signal, coherent radar
Pulse-modulated signal, even coherent noise signal etc..Coherent vector signal generation system has a wide range of application, available for channel radio
Letter system MIMO technology is tested and phased array radar system receiver performance is assessed etc..
The purpose of coherent vector signal generation system calibration is accurately to measure and compensate the width between multichannel coherent signal
Poor, phase difference and time delay equal error are spent, makes completely the same more of coherent vector signal generation system output frequency, amplitude, phase
Road radio frequency coherent signal.
During coherent vector signal generation system time-delay calibration, the system is often controlled to produce the modulation of multichannel coherent pulse first
Signal, and using the time delay between each road signal of high sampling rate oscillograph amplitude demodulation functional measurement, due to making an uproar in multiple signals
The factors such as uniformity, oscilloscope measurement error between sound, multiple signals, cause the measurement accuracy of this measuring method limited：With
Exemplified by 40GHz high sampling rate oscillographs, when not enabling measurement mean time, its measurement error ＞ 20ps；Even if enable in oscillograph
Average function, and average time ＞ 256 times, its time delay measurement error is still above 5ps.
Alternatively, it is also possible to measure the delay inequality of coherent signal using coherent signal computing cross-correlation, but sampled by oscillograph
Rate etc. limits, by taking 40GHz high sampling rate oscillographs as an example, the measurement error ＞ 12.5ps of this method, and operand is big.
With the growth of coherent signal modulation bandwidth, above-mentioned latency measurement error is to coherent vector signal generation system coherent
The influence of characteristic is increasingly severe, and by taking QPSK signals as an example, when symbol rate is 100MHz, ± 5ps latency measurement error causes
About ± 0.3 ° of coherent angle deviating；And when symbol rate brings up to 1GHz, ± 5ps latency measurement error causes about ± 3 °
Coherent angle deviating, above-mentioned latency measurement error have had a strong impact on high symbol rate, the coherent characteristic of high-bandwidth signals.
The content of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of towards coherent vector signal generation system
Time-delay calibration device and method, it can accurately measure the time delay between coherent vector signal generation system multi-channel rf output signal.
For achieving the above object, a kind of time-delay calibration device towards coherent vector signal generation system of the invention,
It is characterised in that it includes：One high sampling rate oscillograph, a coherent vector signal generation system to be calibrated；
Wherein, the multi-channel rf coherent signal output port 1 of described coherent vector signal generation system connects high sampling rate
The CH1 ports of oscillograph, as reference channel；Remaining multi-channel rf coherent signal output port 2-4 connects high sampling rate and shown successively
The CH2 of ripple device is to CH4 ports；The lock-out pulse output port of coherent vector signal generation system connects high sampling rate oscillograph
AUX IN ports, and as the trigger signal source of high sampling rate oscillograph；
By controlling coherent vector signal generation system output multi-channel coherent linear FM signal, the center of the signal is controlled
Frequency, amplitude, bandwidth, pulse width and repetition period；Using the CH1 of high sampling rate oscillograph as reference channel, sampled using height
The time delay between pulses measurement function of rate oscillograph itself, measure between the coherent signal envelope between CH2, CH3, CH4 and reference channel
Time delay, control coherent vector signal generation system these time delays are modified and again output multi-channel coherent linear frequency modulation letter
Number, utilize high sampling rate the oscillograph starting point (rising edge) in every road coherent linear FM signal and terminal (trailing edge) place respectively
The phase difference between each coherent linear FM signal is measured, then utilizes the pass of phase difference and time delay between coherent linear FM signal
System, is calculated the precise delay between each coherent signal output channel, then control coherent vector signal generation system to each road phase
Time delay between ginseng signal output channels and reference channel compensates, so as to eliminate each road coherent letter of coherent vector signal generation system
Delay inequality between number output channel, realize the target of vector signal generation system time delay accurate calibration.
The present invention also provides a kind of method that time-delay calibration device described in carries out time delay accurate calibration, and its feature exists
In comprising the following steps：
(1), the carrier frequency F of coherent vector signal generation system is setcWith output amplitude Ao, control coherent vector signal
Generation system produces multichannel coherent linear FM signal, sets a width of BW of band of coherent linear FM signallfm, pulse width is
T, repetition period P；
(2) envelope demodulation or the amplitude demodulation function of high sampling rate oscillograph, are enabled, to each road coherent linear FM signal
Do Envelope Demodulation Analysis；
(3), using high sampling rate oscillograph edge to edge time measurement function, each road coherent linear FM signal is measured respectively
The time delay of signal envelope, is designated as D between envelope and reference channelci, i=2,3,4, channel C H2, CH3, CH4 and reference are represented respectively
The time delay of interchannel；
(4), the delay volume D measured by foundation step (3)ci, i=2,3,4, control coherent vector signal generation system is to each
Road coherent signal output channel does delay compensation, and coherent vector signal generation system output multi-channel phase again is controlled after compensation
Join linear FM signal；
(5) high sampling rate oscillograph, is adjusted, the starting point (rising edge) of every road coherent linear FM signal is moved into high sampling
Rate oscillograph time shaft central point, measurement now per the phase difference between road coherent linear FM signal and reference channel, are designated asAnd the instantaneous frequency of now signal in reference channel is measured, it is designated as fstart；
(6) high sampling rate oscillograph, is adjusted, the terminal (trailing edge) of every road coherent linear FM signal is moved into high sampling
Rate oscillograph time shaft central point, measurement now per the phase difference between road coherent linear FM signal and reference channel, are designated asAnd the instantaneous frequency of now signal in reference channel is measured, it is designated as fstop；
(7) each road coherent signal output channel of coherent vector signal generation system, is calculated and with reference to logical according to formula (1)
Time delay between road；
(8), the delay volume measured by foundation step (7), control coherent signal generation system export to each road coherent signal
Passage does delay compensation, completes coherent vector signal generation system time-delay calibration.
The present invention also provides another method that time delay accurate calibration is carried out using above-mentioned time-delay calibration device, and it is special
Sign is that the calibration method can be used with iteration, and its step is as follows：
(1), the carrier frequency F of coherent vector signal generation system is setcWith output amplitude Ao, control coherent vector signal
Generation system produces multichannel coherent linear FM signal, sets a width of BW of band of coherent linear FM signallfm, pulse width is
T, repetition period P；
(2) envelope demodulation or the amplitude demodulation function of high sampling rate oscillograph, are enabled, to each road coherent linear FM signal
Do Envelope Demodulation Analysis；
(3), using high sampling rate oscillograph edge to edge time measurement function, each road coherent linear FM signal is measured respectively
The time delay of signal envelope, is designated as D between envelope and reference channelci, i=2,3,4, channel C H2, CH3, CH4 and reference are represented respectively
The time delay of interchannel, makes Di=Dci, i=2,3,4；
(4), according to time delay DiControl coherent vector signal generation system does time delay benefit to each road coherent signal output channel
Repay, control coherent vector signal generation system to send multichannel coherent linear FM signal again after compensation；
(5) high sampling rate oscillograph, is adjusted, the starting point (rising edge) of every road coherent linear FM signal is moved into high sampling
Rate oscillograph time shaft central point, measurement now per the phase difference between road coherent linear FM signal and reference channel, are designated asAnd the instantaneous frequency of now signal in reference channel is measured, it is designated as fstart；
(6) high sampling rate oscillograph, is adjusted, the terminal (trailing edge) of every road coherent linear FM signal is moved into high sampling
Rate oscillograph time shaft central point, measurement now per the phase difference between road coherent linear FM signal and reference channel, are designated asAnd the instantaneous frequency of now signal in reference channel is measured, it is designated as fstop；
(7), according to formula (2), (3) calculate now each road coherent signal output channel of coherent vector signal generation system and
Residual time delay Δ D between reference channeliAnd time delay Di；
(8), the residual time delay Δ D measured by foundation step (7)i, judge whether inequality (4) is set up, if set up, control
Coherent signal generation system processed does delay compensation to each coherent signal output channel, and calibration terminates；If invalid, step is returned
Suddenly (4) continue next round calibration.
Wherein, DlimitFor default time-delay calibration precision.
What the goal of the invention of the present invention was realized in：
A kind of time-delay calibration device and method towards coherent vector signal generation system of the invention, arrived by oscillograph edge
Along time measurement function, the time delay between each coherent signal output channel and reference channel and compensation are obtained；Then utilize oscillograph
The phase difference and instantaneous frequency of each coherent linear FM signal beginning and end opening position are measured, utilizes linear FM signal time delay
Relation between phase difference, instantaneous frequency forms equation, and the essence between each coherent signal output channel and reference channel is calculated
True time delay simultaneously controls compensation, so as to complete the time-delay calibration of the interchannel of coherent vector signal generation system.
Meanwhile a kind of time-delay calibration device and method towards coherent vector signal generation system of the invention is also with following
Beneficial effect：
(1), the present invention has calibration accuracy high compared with coherent vector signal generation system collimation technique in the prior art
The characteristics of：To use 40GHz high sampling rate oscillographs, exemplified by 2GHz bandwidth linear frequency modulation signals, after the inventive method is calibrated,
Time delay worst error ＜ 1.4ps after calibration, measurement error ＜ 1ps：And use prior art, even across multiple time-delay calibration and
Amendment, its time delay calibration error is still above 5ps；
(2), compared with coherent vector signal generation system collimation technique in the prior art, the present invention need not answer the present invention
The computings such as miscellaneous cross-correlation, FFT, it is only necessary to 3 tests and an arithmetical operation, you can complete time delay accurate calibration, there is school
Quasi velosity is fast, calculates the characteristics of simple.
Brief description of the drawings
Fig. 1 is the time-delay calibration device architecture figure of the present invention towards coherent signal generation system；
Fig. 2 is the flow chart calibrated using time-delay calibration device shown in Fig. 1；
Fig. 3 is flow chart when utilizing time-delay calibration device iterative calibration shown in Fig. 1.
Embodiment
The embodiment of the present invention is described below in conjunction with the accompanying drawings, so as to those skilled in the art preferably
Understand the present invention.Requiring particular attention is that in the following description, when known function and the detailed description of design perhaps
When can desalinate the main contents of the present invention, these descriptions will be ignored herein.
Embodiment
Fig. 1 is the time-delay calibration device architecture figure of the present invention towards coherent signal generation system.
In the present embodiment, as shown in figure 1, a kind of time-delay calibration towards coherent vector signal generation system of the present invention fills
Put, including：High sampling rate oscillograph, coherent vector signal generation system to be calibrated, the output connection of coherent signal radio frequency, synchronization
Trigger line.
In the present embodiment, as shown in figure 1, each coherent signal output port of coherent vector signal generation system is passed through into phase
Ginseng signal RF output connection meets oscillograph CH1 to CH4 signal input ports, and using CH1 as reference channel, coherent vector is believed
The synchronization pulse of number generation system connects oscillograph AUX IN ports.
In the present embodiment, the time-delay calibration device towards coherent vector signal generation system with reference to shown in Fig. 1, is also carried
For two kinds of methods on time-delay calibration, two methods are described in detail in turn below.
The method one of time-delay calibration is carried out using time-delay calibration device, is comprised the following steps：
S1, control coherent vector signal generation system output coherent linear FM signal, and set coherent linear frequency modulation to believe
Number centre frequency fc(such as 1GHz), output amplitude Ao(such as 0dBm), swept frequency range BWlfm(such as 2GHz), pulse width T
The parameter such as (such as 5uS) and repetition period P (such as 20uS), the setting main points of above-mentioned parameter are as follows：
S1.1, due to the time delay between each road coherent signal output channel and the centre frequency of coherent signal generation system, defeated
Go out amplitude, etc. it is unrelated, the setting of above-mentioned parameter is to facilitate oscillograph accurate measurement to be defined；
S1.2, pulse broadband and the setting of repetition period and the time delay of each coherent interchannel of coherent vector signal generation system
It is relevant, it is desirable to which that repetition period P should be greater than the maximum delay D between each road coherent signalmax, i.e. P >=Dmax；
S1.3, the numerical value of swept frequency range parameter are bigger, and latency measurement precision is higher, but the numerical value of swept frequency range parameter should not
More than the maximum bandwidth BW of coherent vector signal generation systemmax, i.e. BWlfm≤BWmax；
S2, the envelope demodulation for enabling high sampling rate oscillograph or amplitude demodulation function, to each road coherent linear FM signal
Envelope Demodulation Analysis is done, detailed operating procedure is as follows：
S2.1, the trigger source of setting high sampling rate oscillograph are AUX IN ports, and triggering mode is that rising edge triggers, adjustment
Triggering level allows oscillograph to stablize triggering；
S2.2, each passage of high sampling rate oscillograph is opened, setting input impedance is 50 Ω, adjusts scope horizontal scale
(time shaft), high sampling rate oscillograph can correctly show the sequencing between each road signal after adjustment；
S2.3, set high sampling rate oscillograph vertical shift position to be 0, adjust high sampling rate oscillograph Vertical surveyors' staff, adjust
High sampling rate oscilloscope display signal amplitude is 80% or so of full scale after whole；
S2.4, each passage envelope demodulation of high sampling rate oscillograph or amplitude demodulation function are enabled, in high sampling rate oscillograph
The upper envelope that can see each road coherent linear FM signal；Meanwhile for convenience of observing, close the waveform of each input channel signal
Display.
S3, function, difference are measured using high sampling rate oscillograph edge to the edge time (Edge to Edge Delta Time)
The time delay of signal envelope between each road coherent linear FM signal envelope and reference channel is measured, is designated as Dci, i=2,3,4, generation respectively
Time delay between table channel C H2, CH3, CH4 and reference channel CH1, concrete operation step are：
S3.1, selected from high sampling rate oscilloscope measurement function and add three edges to along time measurement item, wherein：
A) measurement item 1, is set to measure CH2 signal envelopes rising edge to time delay between CH1 signal envelope rising edges；
B) measurement item 2, is set to measure CH3 signal envelopes rising edge to time delay between CH1 signal envelope rising edges；
C) measurement item 3, is set to measure CH4 signal envelopes rising edge to time delay between CH1 signal envelope rising edges；
S3.2, the average function for enabling high sampling rate oscillograph, average time >=256 time；
S3.3, measurement simultaneously record the average value reading (Mean Value) in above three survey measurements, are designated as Dc2、Dc3、
Dc4, using data as each coherent channel time delay a reference value；
After S3.4, measurement, each passage coherent demodulation function of oscillograph is closed.
S4, the time delay a reference value D measured by according to step S3c2、Dc3、Dc4, control coherent vector signal generation system is to each
Road coherent signal output channel does delay compensation, controls coherent vector signal generation system to export phase again after compensation again
Join linear FM signal；
After above-mentioned measurement, by taking 40GHz sample rate oscillographs as an example, coherent channel C H2, CH3, CH4 coherent signal and logical
The latency measurement precision of road CH1 coherent signals is up to 20ps.
S5, utilize high sampling rate oscilloscope measurement coherent linear FM signal starting (signal rising edge) opening position passage
Phase difference between CH2, CH3, CH4 and channel C H1Measure linear FM signal original position passage
CH1 signal transient frequencies fstart, concrete operation step is：
S5.1, adjustment high sampling rate scope horizontal axle offset amount, by the starting of coherent linear FM signal, (signal rises
Edge) position adjustment is to high sampling rate oscillograph time shaft central point；
S5.2, setting high sampling rate scope horizontal scale are 100ps or smaller, accurately to measure coherent interchannel letter
Number phase difference and instantaneous frequency；
S5.3, the average function for enabling high sampling rate oscillograph, average time >=256 time；
S5.4, selected from high sampling rate oscilloscope measurement function and add three phase difference measurement items, wherein：
A) set measurement item 1 to measure CH2 and CH1 signal phase differences, be designated as
B) set measurement item 2 to measure CH3 and CH1 signal phase differences, be designated as
C) set measurement item 3 to measure CH4 and CH1 signal phase differences, be designated as
S5.5, selected from high sampling rate oscilloscope measurement function and add frequency measurement item, set and Measurement channel 1 is believed
Number instantaneous frequency, reading of averaging is designated as fstart；
S5.6, measurement simultaneously record the average value reading (Mean Value) in above three phase difference measurement reading, are designated as
S6, using (trailing edge) channel C H2 at high sampling rate oscilloscope measurement coherent linear FM signal tail position,
Phase difference between CH3, CH4 and channel C H1Measure channel C H1 signal transients frequency f hereinstop, specific behaviour
It is as step：
S6.1, adjustment high sampling rate scope horizontal axle offset amount, by coherent linear FM signal afterbody (trailing edge) position
Put and adjust to high sampling rate oscillograph time shaft central point；
S6.2, the average function for enabling high sampling rate oscillograph, average time >=256 time；
S6.3, selected from high sampling rate oscilloscope measurement function and add frequency measurement item, simultaneously Measurement channel CH1 is set
The instantaneous frequency of signal, reading of averaging are designated as fstop；
S6.4, selected from high sampling rate oscilloscope measurement function and add three phase difference measurement items, wherein：
A), set measurement item 1 to measure CH2 and CH1 signal phase differences, be designated as
B), set measurement item 2 to measure CH3 and CH1 signal phase differences, be designated as
C), set measurement item 3 to measure CH4 and CH1 signal phase differences, be designated as
Average value reading in S6.5, reading above three phase measurement reading, is designated as respectively
S7, each road coherent signal output channel of coherent vector signal generation system and channel C H1 are calculated according to formula (5)
Between residual time delay；
The compensation rate of time delay before consideration, the time delay between final channel C H2, CH3, CH4 and channel C H1 add up to；
S8, the delay volume measured by according to step S7, control coherent vector signal generation system is to each coherent linear frequency modulation
Signal output channels do delay compensation, complete the calibration of coherent vector signal generation system precise delay.
Wherein, formula (5) is derived according to the special relationship between coherent linear FM signal instantaneous phase and instantaneous frequency
, for simplicity, by taking channel C H2 and channel C H1 coherent linear FM signals as an example, illustrate the derivation of formula (5)：
Because coherent linear FM signal is typical pulse signal in itself, in one pulse period P (repetition period)
Including two periods：Pulse on-time section and pulse off-time section；Pulse off-time section does not have any signal output,
Therefore only consider linear FM signal instantaneous frequency, phase and the relation between the time in pulse on-time section, channel C H1 can be obtained
Coherent linear FM signal instantaneous frequency f1(t) relation with time t is：
Wherein,fcIt is the centre frequency of coherent linear FM signal；
If channel C H2 is relative to the instantaneous frequency f that the channel C H1 time amount of delaying is τ, then channel C H22And time t (t)
Relation be：
According to the integral relation between phase and instantaneous frequency, if during t=0, channel C H1 instantaneous phaseThen t is led to
Road CH1 instantaneous phaseFor：
If t=τ, channel C H2 instantaneous phase isThen channel C H2 instantaneous phasesFor：
Then channel C H2 phases during moment tWith channel C H1 phasesBetween phase difference be：
Convolution (7) and formula (11), take two moment t2 and t1 respectively, and following equation is set up：
It can be obtained according to formula (12)：
Formula (13) illustrates, to measure time delay, can choose two moment t2 and t1 respectively, measures the two of the corresponding moment respectively
The phase difference of road coherent linear FM signal and the instantaneous frequency of reference channel, by calculate can try to achieve between two paths of signals when
Prolong difference.
It was found from formula (13), the instantaneous frequency difference at t1 moment and t2 moment is bigger, and the precision of latency measurement is higher, by
Difference of instantaneous frequency between the monotonicity of coherent linear FM signal, coherent linear FM signal beginning and end moment is most
Greatly, therefore coherent linear FM signal starting point (rising edge) place moment t can be selected respectivelystartWith terminal (trailing edge) place's moment
tstop, the measurement accuracy of coherent interchannel time delay is improved with this.
Below by taking 2GHz bandwidth coherent linear FM signals as an example, with 40GHz high sampling rate oscillographs, in 1GHz centers frequency
Rate point, precision analysis is done to latency measurement：
It can be seen from the technical data of high sampling rate oscillograph, when near 1GHz, the uncertainty of its phase difference measurement
For 0.5 °,Worst error be 1 °, according to formula (13) understand, the maximum error of measuring of delay, τ is：
Due to the delay compensation error of coherent vector signal generation system, measurement error of high sampling rate oscillograph etc. because
Element, calibration accuracy can not meet actual requirement after may result in a coherent vector signal generation system time-delay calibration, now
Can iteration perform above-mentioned measurement process, improve coherent vector signal generation system time-delay calibration precision.Iteration uses this calibration side
During method, measure every time between each channel signal and channel C H1 when delay, just by each coherent channel time delay error compensation enter coherent arrow
Signal generation system is measured, is then again started up next round calibration process, and each time delay remainder error amount measured is added up again
Compensate into coherent vector signal generation system；According to above-mentioned iterative calibration process, after the calibration process of 2 to 3 times, you can reach
To perfect condition.
The method two of time-delay calibration is carried out using time-delay calibration device, is calibrated using the pattern of iteration, this was calibrated
Calibration flow under journey and non-iterative pattern is sufficiently close to, and is repeated no more；The key step of method two is illustrated below, its
Comprise the following steps：
T1, the carrier frequency F that coherent vector signal generation system is setcWith output amplitude Ao, the vector signal production of control coherent
Raw system produces multichannel coherent linear FM signal, sets a width of BW of band of coherent linear FM signallfm, pulse width T,
Repetition period is P；
T2, the envelope demodulation for enabling high sampling rate oscillograph or amplitude demodulation function, to each road coherent linear FM signal
Do Envelope Demodulation Analysis；
T3, function, difference are measured using high sampling rate oscillograph edge to the edge time (Edge to Edge Delta Time)
Each road coherent linear FM signal envelope is measured relative to the delay volume of CH1 channel signal envelopes, is designated as Dci, i=2,3,4, point
The time delay between channel C H2, CH3, CH4 and reference channel is not represented, and makes Di=Dci, i=2,3,4；
T4, foundation time delay DiControl coherent vector signal generation system does delay compensation to each coherent signal output channel,
Vector coherent signal generation system is controlled to send multichannel coherent linear FM signal again after compensation；
T5, adjustment high sampling rate oscillograph, high sampling is moved to by the starting point (rising edge) of every road coherent linear FM signal
Rate oscillograph time shaft central point, the phase difference now per road coherent linear FM signal with CH1 interchannels is measured, is designated asAnd the instantaneous frequency of signal in CH1 is measured, it is designated as fstart；
T6, adjustment high sampling rate oscillograph, high sampling is moved to by the terminal (trailing edge) of every road coherent linear FM signal
Rate oscillograph time shaft central point, measurement now per the phase difference between road coherent linear FM signal and CH1, are designated asAnd the instantaneous frequency of signal in CH1 is measured, it is designated as fstop；
T7, according to formula (15), (16) calculate now each coherent signal output channel of coherent vector signal generation system and
Residual time delay Δ D between channel C H1iAnd time delay Di；
T8, the residual time delay residual delta D measured by according to step T7i, judge whether formula (17) is set up, during establishment, calibration
Terminate；When invalid, return to step T4 continues next round calibration.
Wherein, DlimitFor default time-delay calibration precision.
When the coherent passage of coherent vector signal generation system to be calibrated is more than 4 tunnel, coherent signal is exported first logical
Road 1,2,3,4 is corresponding to be connected to oscillograph CH1, CH2, CH3, CH4 ports, between measurement coherent signal output channel 2,3,4 and passage 1
The delay inequality of signal, realize the time-delay calibration of output coherent signal output channel 1,2,3,4；After calibration, then coherent believed
Number output channel 1,5,6,7 is corresponding to be connected to oscillograph CH1, CH2, CH3, CH4 ports, measurement coherent signal output channel 5,6,7
With the delay inequality of 1 signal of passage, the time-delay calibration of coherent signal output channel 5,6,7 is realized, the like.
Although the illustrative embodiment of the present invention is described above, in order to the technology of the art
Personnel understand the present invention, it should be apparent that the invention is not restricted to the scope of embodiment, to the common of the art
For technical staff, if various change in the spirit and scope of the present invention that appended claim limits and determines, this
A little changes are it will be apparent that all utilize the innovation and creation of present inventive concept in the row of protection.
Claims (4)
- A kind of 1. time-delay calibration device towards coherent vector signal generation system, it is characterised in that including：One high sampling rate shows Ripple device, a coherent vector signal generation system to be calibrated；Wherein, the multi-channel rf coherent signal output port 1 of described coherent vector signal generation system connects high sampling rate oscillography The CH1 ports of device, as reference channel；Remaining multi-channel rf coherent signal output port 2-4 connects high sampling rate oscillograph successively CH2 to CH4 ports；The lock-out pulse output port of coherent vector signal generation system meets the AUX IN of high sampling rate oscillograph Port, and as the trigger signal source of high sampling rate oscillograph；By controlling coherent vector signal generation system output multi-channel coherent linear FM signal, the center frequency of the signal is controlled Rate, amplitude, bandwidth, pulse width and repetition period；Using the CH1 of high sampling rate oscillograph as reference channel, high sampling rate is utilized The time delay between pulses measurement function of oscillograph itself, measure between the coherent signal envelope between CH2, CH3, CH4 and reference channel Time delay, these time delays are modified control coherent vector signal generation system and output multi-channel coherent linear frequency modulation is believed again Number, utilize high sampling rate the oscillograph starting point (rising edge) in every road coherent linear FM signal and terminal (trailing edge) place respectively The phase difference between each coherent linear FM signal is measured, then utilizes the pass of phase difference and time delay between coherent linear FM signal System, is calculated the precise delay between each coherent signal output channel, then control coherent vector signal generation system to each road phase Time delay between ginseng signal output channels and reference channel compensates, so as to eliminate each road coherent letter of coherent vector signal generation system Delay inequality between number output channel, realize the target of vector signal generation system time delay accurate calibration.
- 2. the method for utilizing time-delay calibration device described in claim 1 to carry out time delay accurate calibration, it is characterised in that including with Lower step：(1), the carrier frequency F of coherent vector signal generation system is setcWith output amplitude Ao, the vector signal generation of control coherent System produces multichannel coherent linear FM signal, sets a width of BW of band of coherent linear FM signallfm, pulse width T, weight The multiple cycle is P；(2) envelope demodulation or the amplitude demodulation function of high sampling rate oscillograph, are enabled, each road coherent linear FM signal is wrapped Network demodulation analysis；(3), using high sampling rate oscillograph edge to edge time measurement function, each road coherent linear FM signal envelope is measured respectively The time delay of signal envelope, is designated as D between reference channelci, i=2,3,4, channel C H2, CH3, CH4 and reference channel are represented respectively Between time delay；(4), the delay volume D measured by foundation step (3)ci, i=2,3,4, control coherent vector signal generation system is to each road phase Ginseng signal output channels do delay compensation, and coherent vector signal generation system output multi-channel coherent line again is controlled after compensation Property FM signal；(5) high sampling rate oscillograph, is adjusted, the starting point (rising edge) of every road coherent linear FM signal is moved into high sampling rate and shown Ripple device time shaft central point, measurement now per the phase difference between road coherent linear FM signal and reference channel, are designated asi =2,3,4, and the instantaneous frequency of now signal in reference channel is measured, it is designated as fstart；(6) high sampling rate oscillograph, is adjusted, the terminal (trailing edge) of every road coherent linear FM signal is moved into high sampling rate and shown Ripple device time shaft central point, measurement now per the phase difference between road coherent linear FM signal and reference channel, are designated asi =2,3,4, and the instantaneous frequency of now signal in reference channel is measured, it is designated as fstop；(7), calculated according to formula (1) between each road coherent signal output channel of coherent vector signal generation system and reference channel Time delay；(8), the delay volume measured by foundation step (7), control coherent signal generation system is to each road coherent signal output channel Delay compensation is done, completes coherent vector signal generation system time-delay calibration.
- 3. the method for time delay accurate calibration is carried out using the time-delay calibration device described in claim 1, it is characterised in that the calibration Method can be used with iteration, and its step is as follows：(1), the carrier frequency F of coherent vector signal generation system is setcWith output amplitude Ao, the vector signal generation of control coherent System produces multichannel coherent linear FM signal, sets a width of BW of band of coherent linear FM signallfm, pulse width T, weight The multiple cycle is P；(2) envelope demodulation or the amplitude demodulation function of high sampling rate oscillograph, are enabled, each road coherent linear FM signal is wrapped Network demodulation analysis；(3), using high sampling rate oscillograph edge to edge time measurement function, each road coherent linear FM signal envelope is measured respectively The time delay of signal envelope, is designated as D between reference channelci, i=2,3,4, channel C H2, CH3, CH4 and reference channel are represented respectively Between time delay, make Di=Dci, i=2,3,4；(4), according to time delay DiControl coherent vector signal generation system does delay compensation to each road coherent signal output channel, mends Coherent vector signal generation system is controlled to send multichannel coherent linear FM signal again after repaying；(5) high sampling rate oscillograph, is adjusted, the starting point (rising edge) of every road coherent linear FM signal is moved into high sampling rate and shown Ripple device time shaft central point, measurement now per the phase difference between road coherent linear FM signal and reference channel, are designated asi =2,3,4, and the instantaneous frequency of now signal in reference channel is measured, it is designated as fstart；(6) high sampling rate oscillograph, is adjusted, the terminal (trailing edge) of every road coherent linear FM signal is moved into high sampling rate and shown Ripple device time shaft central point, measurement now per the phase difference between road coherent linear FM signal and reference channel, are designated asi =2,3,4, and the instantaneous frequency of now signal in reference channel is measured, it is designated as fstop；(7), now each road coherent signal output channel of coherent vector signal generation system and reference is calculated according to formula (2), (3) The residual time delay Δ D of interchanneliAnd time delay Di；(8), the residual time delay Δ D measured by foundation step (7)i, judge whether inequality (4) is set up, if set up, control phase Ginseng signal generation system does delay compensation to each coherent signal output channel, and calibration terminates；If invalid, return to step (4) next round calibration is continued；<mrow> <mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <mrow> <msub> <mi>&Delta;D</mi> <mn>2</mn> </msub> <mo>&le;</mo> <msub> <mi>D</mi> <mrow> <mi>lim</mi> <mi>i</mi> <mi>t</mi> </mrow> </msub> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>&Delta;D</mi> <mn>3</mn> </msub> <mo>&le;</mo> <msub> <mi>D</mi> <mrow> <mi>lim</mi> <mi>i</mi> <mi>t</mi> </mrow> </msub> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>&Delta;D</mi> <mn>4</mn> </msub> <mo>&le;</mo> <msub> <mi>D</mi> <mrow> <mi>lim</mi> <mi>i</mi> <mi>t</mi> </mrow> </msub> </mrow> </mtd> </mtr> </mtable> </mfenced> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>4</mn> <mo>)</mo> </mrow> </mrow>Wherein, DlimitFor default time-delay calibration precision.
- 4. time-delay calibration device according to claim 1, it is characterised in that the coherent vector signal to be calibrated produces When the coherent passage of system is more than 4 tunnel, first by coherent signal output channel 1,2,3,4 it is corresponding be connected to oscillograph CH1, CH2, CH3, CH4 port, the delay inequality of signal between measurement coherent signal output channel 2,3,4 and passage 1, realize that output coherent signal is defeated Go out the time-delay calibration of passage 1,2,3,4；After calibration, then coherent signal output channel 1,5,6,7 is corresponded to and is connected to oscillograph CH1, CH2, CH3, CH4 port, the delay inequality of signal between measurement coherent signal output channel 5,6,7 and passage 1, realize that coherent is believed The time-delay calibration of number output channel 5,6,7, the like.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102565764A (en) * | 2011-11-25 | 2012-07-11 | 中国船舶重工集团公司第七二四研究所 | Near-field delay calibration method for channels of broadband thinned array radar |
| CN103501160A (en) * | 2013-09-22 | 2014-01-08 | 北京无线电计量测试研究所 | Phase compensation method for frequency conversion time delay calibration system |
| CN103592660A (en) * | 2013-11-27 | 2014-02-19 | 北京无线电计量测试研究所 | Satellite navigation signal simulator calibration and timing type receiver delay device and method |
| KR20140073250A (en) * | 2012-12-06 | 2014-06-16 | 삼성전기주식회사 | Apparatus and method for phase delay of digital signal, and apparatus for time delay of digital pfc |
-
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102565764A (en) * | 2011-11-25 | 2012-07-11 | 中国船舶重工集团公司第七二四研究所 | Near-field delay calibration method for channels of broadband thinned array radar |
| KR20140073250A (en) * | 2012-12-06 | 2014-06-16 | 삼성전기주식회사 | Apparatus and method for phase delay of digital signal, and apparatus for time delay of digital pfc |
| CN103501160A (en) * | 2013-09-22 | 2014-01-08 | 北京无线电计量测试研究所 | Phase compensation method for frequency conversion time delay calibration system |
| CN103592660A (en) * | 2013-11-27 | 2014-02-19 | 北京无线电计量测试研究所 | Satellite navigation signal simulator calibration and timing type receiver delay device and method |
Non-Patent Citations (1)
| Title |
|---|
| 基于矢量信号处理的射频功放预失真技术研究;曹萍;《中国优秀硕士学位论文全文数据库》;20120427;全文 * |
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