CN107329127B - A kind of phase linearity analysis method and system for radar system DBF Function detection - Google Patents
A kind of phase linearity analysis method and system for radar system DBF Function detection Download PDFInfo
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- CN107329127B CN107329127B CN201710623021.2A CN201710623021A CN107329127B CN 107329127 B CN107329127 B CN 107329127B CN 201710623021 A CN201710623021 A CN 201710623021A CN 107329127 B CN107329127 B CN 107329127B
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- 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
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Abstract
The present invention relates to a kind of phase linearity analysis methods for radar system DBF Function detection and system, this method and system to be divided into several data segments by each road baseband digital signal to radio-frequency transmitter；Data segment after segmentation is converted into corresponding complex signal, estimates the phase sequence of complex signal in each data segment；It is compared by phase sequence in each data segment with reference channel, obtains relative phase sequence in each data segment in each channel, and calculate the average value of the relative phase sequence of each data segment；The sequence that the relative phase average value of data segment each in each channel is formed carries out linearity estimation, acquires the slope of curve of each sequence, and be compared by the slope of curve to each channel and obtain DBF Function detection result.Above-mentioned phase linearity analysis method and system eliminate the influence of each channel proper phase, improve the precision of DBF Function detection, simplify the circuit structure of radar system by the analysis to each channel relative phase linearity.
Description
Technical field
The present invention relates to radar remote sensing technology fields, and in particular to a kind of phase for radar system DBF Function detection
Linear analysis method and system.
Background technique
DBF (Digital Beam Forming) i.e. digital beam forming technology, the basic principle is that by each aerial array
The rf echo signal that unit receives is transformed into intermediate-freuqncy signal through radio-frequency transmitter, then is transformed into number through high-speed figure acquisition
Then word signal carries out amplitude-phase weighting processing in digital signal processing unit, receive wave beam required for being formed.DBF
Technology has the advantages that scanning fast and flexible, high resolution, anti-interference and clutter function admirable.DBF technology is applied to satellite
On radar, multi-beam antenna can be realized at the earth's surface using the space diversity effect of array antenna.Compared to traditional analog
Technology realize active phased array, DBF technology system accuracy, flexibility, in terms of have a clear superiority, in satellite
By growing interest in radar system application.DBF technical principle is as shown in Figure 1.
Radar system antenna is made of N number of bay, for the incoming signal of a direction (α angle), by by
Phase difference is mended caused by the propagation difference (n Δ d, n=1,2...N) caused by receiving antenna spatial position is different
It repays, then compensated complex signal is superimposed in the same direction, realize the Wave beam forming of the direction, the final maximum energy for obtaining the direction
Amount receives.D B F basic mathematical relational expression is as follows:
(1) in formula, N is receiving channel number, CnFor n-th of receiving channel real signal through quadrature frequency conversion and amplitude and phase correction
The complex signal obtained afterwards；WβnFor the weighting coefficient in the direction β, can further be written as:
(2) in formula, d is bay interval；λ is signal wavelength；β is synthesis beam pointing-angle.
Complex signal CnIt can further be written as:
(3) in formula, AnFor the amplitude of n-th of complex signal；F is signal frequency；θnFor the initial phase of n-th of complex signal.θn
It can further be written as:
(4) in formula,The inherent delay that signal is received for the proper phase of n-th receiving channel namely the road, depends on
In the hardware circuit characteristic of each receiving channel.(4) formula is substituted into (3) formula, further obtains complex signal CnExpression formula:
By above-mentioned relation formula as it can be seen that the signal path phase introduced by each element position differenceCan by with
Weighting coefficient WβnMultiplication is eliminated, and may be implemented in synthesis peak signal energy on the direction α as β=α.
According to above-mentioned relation formula, in order to test the reception DBF performance an of radar system, need to eliminate each receiving channel by
The proper phase caused by part characteristic is inconsistentInfluence.Generally use in the prior art receiving channel internal calibration or
The mode of total system external calibration.
Internal calibration mode injects internal calibration signal from each receiving channel front end of radar, obtains after back end signal is handled every
The proper phase of a receiving channel.Internal calibration mode needs to increase internal calibration signal source, on the one hand increases system complexity, together
When since internal calibration signal is without antenna element, cause in the channel phases obtained the phase not introduced comprising antenna element inclined
Difference, so that calibration accuracy be made to reduce.
External calibration mode usually by radar system as a whole, it is solid to carry out receiving channel using rotating electric field vector method
There is phasing.This calibration method is complicated for operation, very high to measuring device precision prescribed, and needs to measure all battle arrays one by one
Member, correction time are longer.
Summary of the invention
It is an object of the present invention to there are calibration accuracies to solve existing radar system DBF method for testing performance low, behaviour
Make complicated technical problem, a kind of phase linearity analysis method and system for radar system DBF Function detection is provided；It utilizes
System and method of the invention is capable of the DBF function of the test radar system of accurate quick, and solid without calibrating receiving channel
Have the influence of phase, suitable under far field condition to the Function detection of radar system DBF.
To solve the above problems, a kind of phase linearity for radar system DBF Function detection provided by the invention is analyzed
Method, this method comprises:
The intermediate-freuqncy signal that step 1) exports each radio-frequency transmitter carries out sample quantization respectively, by the intermediate-freuqncy signal after quantization
Digital Down Convert is carried out, each road baseband digital signal is obtained；
Step 2) carries out the differentiation of inter-channel synchronization timing to each road baseband digital signal, will meet the every of synchronous sequence relationship
The baseband digital signal in one channel is divided into several data segments；
Data segment after segmentation is converted to corresponding complex signal by step 3), estimates the phase of complex signal in each data segment
Sequence；
Step 4) sets any channel as reference channel, by phase sequence and reference channel in each data segment in each channel
Each data segment in phase sequence be compared, obtain relative phase sequence in each data segment in each channel, and calculate each number
According to the average value of the relative phase sequence of section；
The sequence that step 5) forms the relative phase average value of data segment each in each channel carries out linearity estimation, asks
Obtain the slope of curve of each sequence；
Step 6) carries out arithmetic progression Relationship Comparison to the slope of curve in each channel in addition to reference channel, if curve is oblique
Rate is unsatisfactory for arithmetic progression relationship, then is judged to not meeting DBF functional requirement for its corresponding channel, otherwise, it is determined that meet
DBF functional requirement.
The present invention also provides a kind of phase linearity analysis system for radar system DBF Function detection, the system packets
It includes: ADC converting unit, Digital Down Converter Module, phase linearity analysis module, clock synchronization unit, rotation angle synchronous recording
Device and DBF function detection module；
The ADC converting unit, the intermediate-freuqncy signal for exporting each radio-frequency transmitter carry out sample quantization；
The Digital Down Converter Module, for the intermediate-freuqncy signal after the quantization of ADC converting unit to be carried out Digital Down Convert,
Each road baseband digital signal is obtained, and baseband digital signal is exported to phase linearity analysis module；
The phase linearity analysis module, for carrying out the differentiation of inter-channel synchronization timing to each road baseband digital signal,
The baseband digital signal for meeting each channel of synchronous sequence relationship is divided into several data segments；Data segment after segmentation is turned
It is changed to corresponding complex signal, estimates the phase sequence of complex signal in each data segment；Any channel is set as reference channel, it will be every
Phase sequence is compared with phase sequence in each data segment of reference channel in each data segment in one channel, obtains each channel
Each data segment in relative phase sequence, and calculate the average value of the relative phase sequence of each data segment；It will be each in each channel
The sequence of the relative phase average value composition of data segment carries out linearity estimation, acquires the slope of curve of each sequence；To except reference
The slope of curve in each channel outside channel carries out arithmetic progression Relationship Comparison, and comparison result is exported to DBF function detection module；
The DBF function detection module divides the slope of curve comparison result of phase linearity analysis module output
Analysis, and combine the DBF function of the aerial array rotation angle detection radar system of rotation angle synchronous recording device output；
The clock synchronization unit, for generating ADC converting unit, Digital Down Converter Module, phase linearity analysis mould
Clock sync signal needed for block and rotation angle synchronous recording device；
The rotation angle synchronous recording device, for recording the rotation angle value of aerial array in real time, the rotation angle
Value receives retention time synchronous corresponding relationship between data radar.
As a further improvement of the above technical scheme, the ADC converting unit includes: amplifier, filter and ADC
Conversion module；The amplifier and filter is respectively used to that the intermediate-freuqncy signal that radio-frequency transmitter exports is amplified and filtered
Processing；The ADC conversion module is used to carry out digital collection to the intermediate-freuqncy signal after amplification and filtering processing.
As a further improvement of the above technical scheme, the Digital Down Converter Module includes: digital controlled oscillator, mixing
Device and sampling filter；The digital oscillator is used to provide local oscillation signal for system；The frequency mixer is used for will be digital
The intermediate-freuqncy signal of acquisition is transformed into low frequency signal；The sampling filter is used to lower the sampled data rate of low frequency signal.
A kind of the advantages of phase linearity analysis method and system for radar system DBF Function detection of the invention, is:
(1) the complexity that radar system receives DBF Function detection is simplified, the testing time is reduced, improves test effect
Rate.Existing DBF test needs to correct the influence of each channel proper phase, is needed thus using high-precision measuring instrument and is answered
Miscellaneous means of testing, causes complicated for operation, and the testing time is longer, and error is larger.It is of the invention a kind of for Radar Receiver System
The digital phase linear analysis device of DBF Function detection is without complicated dedicated calibration instrument equipment, without complicated behaviour
Make step；Data handling procedure is simple, calculates fast, can detect the reception DBF function of radar system in a short time.
(2), by the analysis to each channel relative phase linearity, the influence of each channel proper phase is eliminated, further
Improve the precision of DBF Function detection.And due to not influenced by each channel proper phase, so no setting is required for radar system
The special internal calibration circuit for the correction of channel proper phase, to simplify the circuit design of radar system.
(3) full digital processing mode keeps data sectional, signal complex transformation, linear analysis more flexible and with higher
Handle signal-to-noise ratio and calculating speed.Angle flexible partition data segment, length can be rotated according to aerial array, according to ADC sampling rate
Different complex signal modes is used with quantization digit, base is selected according to the relative position between aerial array and transmitting antenna
Quasi- reference channel, therefore data processing method is very flexible.FPGA or FPGA+ high-speed dsp can be used and carry out data processing, it can
Higher processing signal-to-noise ratio and calculating speed are obtained, the timeliness and accuracy of radar system DBF Function detection are improved.
Detailed description of the invention
Fig. 1 is DBF technical principle schematic diagram；
Fig. 2 is that radar system receives DBF functional test schematic illustration；
Fig. 3 is that a kind of phase linearity analysis method process for radar system DBF Function detection provided by the invention is shown
It is intended to；
Fig. 4 is a kind of digital phase linear analysis device knot for radar system DBF Function detection provided by the invention
Structure schematic diagram；
Fig. 5 is the phase linearity analysis module structural schematic diagram in the present invention；
Fig. 6 is to divide timing diagram to each channel data section using digital phase linear analysis device；
Fig. 7 is the example schematic applied digital phase linear analysis device in radar system DBF Function detection.
Appended drawing reference
1, ADC converting unit 2, Digital Down Converter Module
3, phase linearity analysis module 4, clock synchronization unit
5, angle synchronous recording device 6, DBF function detection module are rotated
31, interchannel timing synchronization arbiter 32, channel internal data field divider
33, complex signal device 34, phase estimator in section
35, relative phase linearity estimator between phase comparator 36, channel inner segment in interchannel section
37, inter-channel phase slope of curve comparator 41, ADC converting unit clock sync signal
42, the clock sync signal of Digital Down Converter Module
43, the clock sync signal of interchannel timing synchronization arbiter
44, the clock sync signal of channel internal data field divider
45, the clock sync signal of angle synchronous recording device is rotated
51, first angle position signal
52, second angle position signal
Specific embodiment
With reference to the accompanying drawings and examples to of the present invention a kind of for the digital of radar system DBF Function detection
Phase linearity analyzer is described in detail.
For the radar system using DBF system, radar equipment receiving channel quantity itself is more, and circuit structure is complicated.For
The DBF function of verifying radar system needs to eliminate receiving channel proper phaseInfluence,Calibration method is complicated, to survey
It is high to measure equipment requirement precision, and the testing time is long.In order to solve this technical problem, the present invention devises a kind of for radar system
System receive DBF Function detection digital phase linear analysis device and phase linearity analysis method, can accurate quick test
The reception DBF function of radar system, and without calibrating receiving channel proper phaseInfluence, be suitable for far field condition under it is right
The Function detection of radar system reception DBF.
Radar system receives DBF Function detection and usually carries out under far field condition, and test site is microwave dark room or open
Outfield.If aerial array physical size is a × b, electromagnetic wavelength λ then meets the measuring distance of far field condition are as follows:
Radio-frequency signal source and transmitting antenna are set up, makes it at a distance from aerial arrayAdjust radio-frequency signal source and
The position of array antenna is directed toward, and aerial array is made to be located within the scope of the main beam of radio-frequency transmissions antenna (3dB beam angle) as far as possible,
To obtain biggish received signal to noise ratio, the positional relationship between transmitting antenna and aerial array is as shown in Figure 2.
Aerial array physical size is a × b.
Each array element is l in the physical size perpendicular to incidence wave direction, and it is N number of to share array element.
The distance of radio-frequency signal source and transmitting antenna to radar antenna array is R,And R > > l.
Each array element is connect with radio-frequency transmitter, and it is N number of to share radio-frequency transmitter.The intermediate-freuqncy signal of receiver output
Phase is expressed asI=1,2 ... N, whereinFor the proper phase of i-th of receiving channel；For due to receiving
Signal transmits the relative phase that path length difference introduces.According to Fig.2, using range transmission antenna for R the 1st array element as ginseng
It examines, then the signal transmission path length difference of adjacent array element is Δ r1, Δ r2…Δri..., i=1,2 ... N.Due to R > > l and θ
Angle is smaller (θ≤± 5 °), Δ riCan approximate representation be Δ ri=(i-1) lsin θ, thenI=1,2...N.It is reference, the then opposite phase of each receiving channel signal with channel one
Position is expressed as follows:
Channel N:
In smaller (θ≤± 5 °) range in the angle θ, sin θ ≈ θ is enabled(constant), then (1) formula can further indicate that
Are as follows:
Channel N:
According to (2) formula it is found that in addition to reference channel, the relative phase and angle, θ of each channel signal are linear, and each
The relative phase slope of curve in channel is at arithmetic progression relationship.Array antenna is rotated in orientation low-angle (θ≤± 5 °), it can
Obtain phase value of each receiving channel at the different angles θ；By carrying out digital processing to each channel receiving signal, its phase is analyzed
It can be detected the reception DBF function of the radar system to the linear relationship of phase and angle, θ.
The test complexity of DBF Function detection is received the purpose of the invention is to simplify radar system, when reducing test
Between, and influence of the radar receiving channel proper phase to test result is eliminated, improve accuracy in detection.To achieve the above object,
The present invention provides a kind of phase linearity analysis methods that DBF Function detection is received for radar system；As shown in figure 3, the party
Method specifically includes the following steps:
The intermediate-freuqncy signal that step 1) exports each radio-frequency transmitter carries out sample quantization respectively, by the intermediate-freuqncy signal after quantization
Digital Down Convert is carried out, each road baseband digital signal is obtained；
Step 2) carries out the differentiation of inter-channel synchronization timing to each road baseband digital signal, will meet the every of synchronous sequence relationship
The baseband digital signal in one channel is divided into several data segments；
Data segment after segmentation is converted to corresponding complex signal by step 3), estimates the phase of complex signal in each data segment
Sequence；
Step 4) sets any channel as reference channel, by phase sequence and reference channel in each data segment in each channel
Each data segment in phase sequence be compared, obtain relative phase sequence in each data segment in each channel, and calculate each number
According to the average value of the relative phase sequence of section；
The sequence that step 5) forms the relative phase average value of data segment each in each channel carries out linearity estimation, asks
Obtain the slope of curve of each sequence；
Step 6) carries out arithmetic progression Relationship Comparison to the slope of curve in each channel in addition to reference channel, if curve is oblique
Rate is unsatisfactory for arithmetic progression relationship, then is judged to not meeting the requirement of DBF Function detection for its corresponding channel, otherwise, it is determined that being
Meet the requirement of DBF Function detection.
The present invention also provides a kind of digital phase linear analysis devices that DBF Function detection is received for radar system.
The phase linearity analyzer includes: that ADC converting unit, Digital Down Converter Module, phase linearity analysis module, clock synchronize list
Member, rotation angle synchronous recording device and DBF function detection module.
The radio-frequency transmitter of the ADC converting unit and front end connects, the intermediate frequency for exporting each radio-frequency transmitter
Signal carries out sample quantization, each radio-frequency transmitter is connected with an ADC conversion module, if there is N number of penetrate in radar system
Frequency receiver then has N number of ADC conversion module.There are stringent synchronizing clock signals between each ADC conversion module, guarantee each logical
The temporal consistency of road sample quantization data.ADC converting unit is connect with Digital Down Converter Module simultaneously, by the number after quantization
Signal is exported to Digital Down Converter Module.
The Digital Down Converter Module is connect with ADC converting unit and phase linearity analysis module.In after quantization
Frequency signal carries out Digital Down Convert, is converted into base band, and the baseband digital signal of acquisition is exported to phase linearity analysis module.
The phase linearity analysis module is connect with Digital Down Converter Module and DBF function detection module.To input
Each road baseband digital signal carries out the differentiation of inter-channel synchronization timing, will meet the base band number in each channel of synchronous sequence relationship
Word signal is divided into several data segments, the real signal data segment after segmentation is converted to corresponding complex signal, then estimate each number
According to the phase sequence of complex signal in section；Then any channel is set as reference channel, by phase in each data segment in each channel
Sequence is compared with phase sequence in each data segment of reference channel, obtains relative phase sequence in each data segment in each channel
Column, and the average value of the relative phase sequence of each data segment is calculated, then the relative phase of each data segment in each channel is averaged
The sequence of value composition carries out linearity estimation, acquires a slope of curve of each sequence；It is bent to each channel in addition to reference channel
Line slope carries out arithmetic progression relationship analysis and compares, and comparison result is exported to DBF function detection module.
The DBF function detection module is connect with phase linearity analysis module and rotation angle synchronous recording device.To phase
The slope of curve comparison result of bit line analysis module input is analyzed, and come in conjunction with rotation angle synchronous recording device input
Aerial array rotates angle to detect the reception DBF function of the radar system.
In DBF function detection module, according to above-mentioned relation formula (2), the relative phase of each receiving channel signal is carried out
Linear fit, abscissa are that aerial array rotates angle, θ, and ordinate is the relative phase of each channel signalIt can then calculate
Slope k between θch2, kch3…kchNIf kch2, kch3…kchNMeet arithmetic progression relationship, then determines that the radar system can
It realizes DBF function, if being unsatisfactory for arithmetic progression relationship, determines that the radar system cannot achieve DBF function or DBF synthesis wave beam
Error it is larger.
The clock synchronization unit and ADC converting unit, Digital Down Converter Module, phase linearity analysis module and rotation
The connection of angle synchronous recording device.Clock synchronization unit is for generating ADC converting unit, Digital Down Converter Module, phase linearity point
Analyse module and rotation angle synchronous recording device needed for clock sync signal, guarantee ADC converting unit, Digital Down Converter Module,
Stringent time synchronizing relation between phase linearity analysis module and rotation angle synchronous recording device.
The rotation angle synchronous recording device is connect with phase linearity analysis module and DBF function detection module.Rotation
Angle synchronous recording device is used for the orientation angle value of real-time record array antenna, and the angle value and radar receive to be protected between data
Hold stringent time synchronization corresponding relationship.The angle value recorded is exported to phase linearity and is analyzed by rotation corner synchronous recording device
Module and DBF function detection module, for assisting the reception DBF function of detection radar system.
Phase linearity analysis module based on above-mentioned function, which can further comprise: interchannel
Timing synchronization arbiter, channel internal data field divider, complex signal device, phase estimator in section, phase in interchannel section
Relative phase linearity estimator and interchannel relative phase slope comparator between comparator, channel inner segment.
The interchannel timing synchronization arbiter is used to differentiate the synchronized relation of each channel number word baseband signal after demodulation,
Digital signal for meeting synchronized relation does further subsequent processing.Since the clock of each ADC conversion module keeps synchronizing, institute
It can be converted into the differentiation to each channel sampled data points consistency with the differentiation of each channel baseband digital signal synchronized relation, if
One data of channel points are P1, two data of channel points are P2... N data points in channel are PN, work as P1=P2=...=PNWhen, then
Determine that the data in each channel meet synchronized relation, further subsequent processing can be done；
The channel internal data field divider is adapted at segmentation for being divided into the continuous sampling data in each channel
Several data segments of reason, the data points in each channel corresponding data section are identical.Data points description such as table in the section in each channel
Shown in lattice 1, meet SP11=SP21=...=SPN1, SP12=SP22=...=SPN2... ..., SP1k=SP2k=...=SPNk；
Data points indicate list in each channel section of table 1
| Serial number | Data segment 1 is counted | Data segment 2 is counted | …… | Data segment k points |
| Channel one | SP11 | SP12 | …… | SP1k |
| Channel two | SP21 | SP22 | …… | SP2k |
| …… | …… | …… | …… | |
| Channel N | SPN1 | SPN2 | …… | SPNk |
Each data segment real signal after the complex signal device is used to divide is corresponding complex signal, and will
Transformed complex signal is exported to phase estimator in section；
Phase estimator is used to calculate the phase of complex signal in each data segment in the section, that is, calculates each complex data sample
The phase angle value of point, obtains the phase sequence of each data segment in each channel, as shown in Table 2；
Phase sequence table in each channel section of table 2
| Serial number | The phase sequence of data segment 1 | The phase sequence of data segment 2 | …… | The phase sequence of data segment k |
| Channel one | θ11[...], total SP11A element | θ12[...], total SP12A element | …… | θ1k[...], total SP1kA element |
| Channel two | θ21[...], total SP21A element | θ22[...], total SP22A element | …… | θ1k[...], total SP2kA element |
| …… | …… | …… | …… | …… |
| Channel N | θn1[...], total SPN1A element | θn2[...], total SPN2A element | …… | θNk[...], total SPNkA element |
The phase estimation method of complex signal specifically includes: real signal is write a letter in reply by Hilbert transform method migration
Number, complex signal has real component and imaginary, and such as: s=a+j*b can calculate the phase of the complex signal according to this relational expression
Position:The above calculating process needs to keep synchronized relation between the two using clock synchronization unit,
That is it needs to be determined that the one-to-one relationship determined between signal phase angle value and array antenna azimuth angle value.
Phase comparator is used to calculate each channel relative to any channel (in the present embodiment in the interchannel section
Be described with channel one for reference channel) section in relative phase, obtain relative phase sequence in section, and calculate the sequence
Average value, the average value of relative phase sequence and sequence is respectively as shown in table 3 and table 4.
Relative phase sequence in each channel section of table 3
The mean value of relative phase sequence in each channel section of table 4
Relative phase linearity estimator is used to export phase comparator in interchannel section between the channel inner segment
The equal value sequence of the relative phase in each channel carries out independent linear analysis.I.e. to the k relative phase mean value in each channel into
Row linear fit calculates the slope of each matched curve, such as table 5.
The slope of each channel matched curve of table 5
| Serial number | The slope of each channel relative phase mean value matched curve |
| Channel one | kch1=0 |
| Channel two | kch2 |
| Channel three | kcha |
| …… | …… |
| Channel N-1 | kchN-1 |
| Channel N | kchN |
The inter-channel phase slope of curve comparator is for comparing relative phase linearity estimator between the inner segment of channel
The slope of each channel matched curve of output, judges each channel slope value kch2, kch3... ..., kchNWhether arithmetic progression pass is met
System, and will differentiate that result is exported to DBF function detection module.Described in the comparison result of the slope of curve i.e. above-mentioned table 5
The slope k of each channel relative phase mean value matched curvech2, kch3…kchN。
If meeting arithmetic progression relationship, determines that the radar system can be realized and receive DBF function；If be unsatisfactory for
Difference series relationship determines that the radar system cannot achieve reception DBF function or the error of synthesis wave beam is larger, thus can be further
By DBF function detection module to the radar system carry out hardware fault investigation or to system sequence logic control signal whether just
Often, whether clock signal the performances such as synchronizes and is detected.
Above-mentioned digital phase linear analysis device and phase linearity analysis method of the invention is examined in radar system DBF performance
It surveys in field trial and has obtained applications well.Through actual test the result shows that: the digital phase linear analysis device and phase line
Property analysis method operational excellence in the outfield DBF performance test of radar system, can fast and accurately detect radar system
DBF performance is received, operating procedure is simple, data processing fast and flexible.
Embodiment one
As shown in figure 4, providing a kind of digital phase for receiving DBF Function detection for radar system in this example
Linear analysis device, comprising: ADC converting unit 1, Digital Down Converter Module 2, phase linearity analysis module 3, clock synchronization unit 4,
Rotate angle synchronous recording device 5 and DBF function detection module 6.The ADC converting unit 1 and Digital Down Converter Module 2 connects
It connects, the analog intermediate frequency signal that radio-frequency transmitter exports is carried out using quantization, and the digital medium-frequency signal after quantization is output to
Digital Down Converter Module.ADC converting unit 1 is controlled by clock synchronization unit, analyzes with Digital Down Converter Module 2, phase linearity
Stringent time synchronizing relation is kept between module 3, rotation angle synchronous recording device 5.
The Digital Down Converter Module 2 is connect with ADC converting unit 1 and phase linearity analysis module 3, is used for ADC
The digital medium-frequency signal that the input of converting unit 1 comes transforms to base band, and exports to phase linearity analysis module 3 and carry out digital signal
Processing.
The phase linearity analysis module 3 is the core element of digital phase linear analysis device of the invention.Its is defeated
Enter end to connect with Digital Down Converter Module 2, the digital baseband signal of input is handled, including interchannel timing differentiates, number
Compare according to phase estimation, inter-channel phase in section segmentation, complex signal, section, interchannel relative phase linearity estimate analysis
Operation, output end are connect with DBF function detection module, and analysis result is exported to DBF function detection module.
The clock synchronization unit 4 and ADC converting unit 1, Digital Down Converter Module 2, phase linearity analysis module 3,
Rotate angle synchronous recording device 5 connect, provide synchronizing clock signals for it, the clock synchronization unit 4 simultaneously with radar system its
The clock signal of his unit module keeps stringent time synchronization.
The rotation angle synchronous recording device 5 is connect with phase linearity analysis module 3 and DBF function detection module 6, will
The aerial array rotary angle signal recorded in real time is exported to phase linearity analysis module 3 and DBF function detection module 6；Rotation
Gyration synchronous recording device 5 is controlled by clock synchronization unit 4, and the rotary angle signal of output has determining gomma.
The DBF function detection module 6 is connect with phase linearity analysis module 3 and rotation angle synchronous recording device 5, root
The DBF function of radar system is analyzed according to each channel relative phase linear relationship and corresponding aerial array rotation angle,
It provides radar system and receives DBF Function detection result.
The ADC converting unit 1 is the analogue-to-digital converters part of digital phase linear analysis device, ADC conversion
Unit specifically includes: amplifier, filter and ADC conversion module.The amplifier and filter is respectively used to connect radio frequency
The intermediate-freuqncy signal of receipts machine output is amplified and is filtered；After the ADC conversion module is used for amplification and filtering processing
Intermediate-freuqncy signal carry out digital collection.The input terminal of ADC converting unit 1 passes through the intermediate frequency of radio-frequency cable and radar radio-frequency transmitter
Signal output end connection；Its output end is connect by low-frequency cable with Digital Down Converter Module 2；ADC converting unit 1 and clock are same
Unit 4 is walked to connect by radio-frequency cable.As shown in figure 5, clock synchronization unit 4 is by the clock sync signal 41 of ADC converting unit
Be input to ADC converting unit 1, make its complete analog-digital conversion and with other unit module settling time synchronized relations.
The Digital Down Converter Module 2 includes: digital controlled oscillator, frequency mixer and sampling filter.The number vibration
Device is swung for providing local oscillation signal for system；The frequency mixer is used to for the intermediate-freuqncy signal of digital collection to be transformed into low frequency letter
Number；The sampling filter is used to lower the sampled data rate of low frequency signal.The input terminal and ADC of Digital Down Converter Module 2
Converting unit 1 connects；Its output end is connect by low-frequency cable with phase linearity analysis module 3；Digital Down Converter Module 2 is simultaneously
It is connect with clock synchronization unit 4 by radio-frequency cable；As shown in figure 5, clock synchronization unit 4 is by the clock of Digital Down Converter Module
The output of synchronization signal 42 makes it complete the conversion of digital intermediate frequency to digital baseband signal, number is lower to be become to Digital Down Converter Module 2
Frequency module 2 keeps the time synchronizing relation with other unit modules.
As shown in figure 5, in the present embodiment, the phase linearity analysis module 3 includes: that interchannel timing synchronization differentiates
Device 31, channel internal data field divider 32, complex signal device 33, phase estimator 34 in section, phase bit comparison in interchannel section
Relative phase linearity estimator 36, inter-channel phase slope of curve comparator 37 between device 35, channel inner segment.The interchannel
Timing synchronization arbiter 31 is connect with Digital Down Converter Module 2, is believed the multi-channel digital base band that Digital Down Converter Module 2 inputs
Number carry out timing differentiation, judge whether each channel signal has stringent time synchronizing relation, will have strict time synchronization pass
The digital signal of system is exported to channel internal data field divider 32.Interchannel timing arbiter 31 is same by radio-frequency cable and clock
It walks unit 4 to connect, receives the clock sync signal 43 of timing synchronization arbiter between 4 input channel of clock synchronization unit, guarantee more
The accuracy and consistency that channel data timing differentiates；Timing differentiates between 32 receiving channel of channel internal data field divider
The data in each channel are divided into several data segments, and each channel is kept to correspond to number by the multichannel digital signal that device 31 inputs
According to the strict time synchronization between section, the signal waveform of segmentation is as shown in Figure 6.It is same that channel internal data field divider 32 receives clock
The clock sync signal 44 for walking 4 input channel internal data field divider of unit, generates the timing control for dividing each channel data
Signal processed, the data segment 1 in each channel, data segment 2 ... ... data segment k keep stringent relationship synchronization time, each logical to guarantee
Data points in road identical data section are consistent.Channel internal data field divider 32 connects with rotation angle synchronous recording device 5 simultaneously
It connects, receives the aerial array first angle position signal 51 that rotation angle synchronous recording device 5 inputs, according to determining point of rotation angle
The data segment, length cut determines the control sequential and logic of data segment segmentation timing control signal；The complex signal
Device 33 is connect with phase estimator 34 in channel internal data field divider 32 and section, and receiving channel internal data field divider 32 inputs
Real signal, convert thereof into corresponding complex signal, and export to phase estimator 34 in section；Phase estimation in the section
Device 34 is connect with phase comparator 35 in complex signal device 33 and interchannel section, for calculating institute in each data segment in each channel
There is the phase of complex signal, obtains phase sequence corresponding with data segment, and export to phase comparator 35 in interchannel section；
The relative phase linearity is estimated between phase estimator 34 and channel inner segment in phase comparator 35 and section in the interchannel section
Device 36 connects, and obtains relative phase sequence in section relative to relative phase in the section of reference channel for calculating each channel, and count
The average value of relative phase sequence in section is calculated, calculated result is exported to relative phase linearity estimator 36 between the inner segment of channel；Institute
Relative phase linearity estimator 36 and phase comparator 35 and inter-channel phase curve in interchannel section between the channel inner segment stated
Slope comparator 37 connects, and carries out linear fit for the phase average to all data segments in each channel, calculates each channel
The slope value of matched curve exports calculated result to inter-channel phase slope of curve comparator 37；The inter-channel phase
Relative phase linearity estimator 36 and DBF function detection module 6 connect between slope of curve comparator 37 and channel inner segment, are used for
Compare the numerical relation between each channel plot slope, judge whether each channel plot slope meets arithmetic progression, knot will be compared
Fruit exports to DBF function detection module 6.
The clock synchronization unit 4 is produced for all clock signals needed for generating digital phase linear analysis device
The clock signal of raw clock signal and other unit modules of radar system keeps synchronized relation.Clock synchronization unit 4 and ADC turn
It changes unit 1, Digital Down Converter Module 2, interchannel timing synchronization arbiter 31, channel internal data field divider 32 to connect, output
The signal of synchronizing clock signals, clock synchronization unit output has the characteristic of high freuqency accuracy and high frequency stability.
The rotation angle synchronous recording device 5 for recording the azimuth angle value of radar antenna array, angle value in real time
Stringent time synchronizing relation is kept between each channel digital signal.It exports to the aerial array of channel internal data field divider
First angle position signal 51 is used to determine the partitioning scheme of each channel data section；It exports to the antenna of DBF function detection module
Data input of the array second angle position signal 52 for the analysis of DBF Function detection.
The DBF function detection module 6 is connect with phase linearity analysis module 3 and rotation angle synchronous recording device 5, root
The DBF function of radar system is analyzed according to each channel relative phase linear relationship and corresponding aerial array rotation angle,
It provides radar system and receives DBF Function detection result.
As shown in fig. 7, being the application example schematic block of digital phase linear analysis device of the invention in radar system
Figure.The digital linear phase analyzer is applied to radar system and receives in DBF Function detection, reduces test complexity, mentions
High testing efficiency and detection accuracy；Simultaneously without specially being corrected to each channel inherent delay, operating procedure is simplified；It adopts
Signal calculation processing is carried out with digital form, considerably increases the flexibility of signal processing, higher processing letter can be obtained
Make an uproar than and calculating speed, improve the timeliness and accuracy of radar system DBF Function detection.
It should be noted last that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting.Although ginseng
It is described the invention in detail according to embodiment, those skilled in the art should understand that, to technical side of the invention
Case is modified or replaced equivalently, and without departure from the spirit and scope of technical solution of the present invention, should all be covered in the present invention
Scope of the claims in.
Claims (4)
1. a kind of phase linearity analysis method for radar system DBF Function detection, which is characterized in that this method comprises:
The intermediate-freuqncy signal that step 1) exports each radio-frequency transmitter carries out sample quantization respectively, and the intermediate-freuqncy signal after quantization is carried out
Digital Down Convert obtains each road baseband digital signal；
Step 2) carries out the differentiation of inter-channel synchronization timing to each road baseband digital signal, will meet each logical of synchronous sequence relationship
The baseband digital signal in road is divided into several data segments；
Data segment after segmentation is converted to corresponding complex signal by step 3), estimates the phase sequence of complex signal in each data segment
Column；
Step 4) sets any channel as reference channel, by each of phase sequence in each data segment in each channel and reference channel
Phase sequence is compared in data segment, obtains relative phase sequence in each data segment in each channel, and calculate each data segment
Relative phase sequence average value；
The sequence that step 5) forms the average value of the relative phase sequence of data segment each in each channel carries out linearity estimation,
Acquire the slope of curve of each sequence；
Step 6) carries out arithmetic progression Relationship Comparison to the slope of curve in each channel in addition to reference channel, if the slope of curve is not
Meet arithmetic progression relationship, then its corresponding channel is judged to not meeting DBF functional requirement, otherwise, it is determined that meet DBF function
It can require.
2. a kind of phase linearity analysis system for radar system DBF Function detection, which is characterized in that the system includes: ADC
Converting unit (1), Digital Down Converter Module (2), phase linearity analysis module (3), clock synchronization unit (4), rotation angle are same
Walk logger (5) and DBF function detection module (6)；
The ADC converting unit (1), the intermediate-freuqncy signal for exporting each radio-frequency transmitter carry out sample quantization；
The Digital Down Converter Module (2), for carrying out the intermediate-freuqncy signal after ADC converting unit (1) quantization, number is lower to be become
Frequently, each road baseband digital signal is obtained, and baseband digital signal is exported to phase linearity analysis module (3)；
The phase linearity analysis module (3) will for carrying out the differentiation of inter-channel synchronization timing to each road baseband digital signal
The baseband digital signal for meeting each channel of synchronous sequence relationship is divided into several data segments；By the data segment conversion after segmentation
For corresponding complex signal, the phase sequence of complex signal in each data segment is estimated；Any channel is set as reference channel, it will be each
Phase sequence is compared with phase sequence in each data segment of reference channel in each data segment in channel, obtains each channel
Relative phase sequence in each data segment, and calculate the average value of the relative phase sequence of each data segment；By number each in each channel
Linearity estimation is carried out according to the sequence of the average value composition of the relative phase sequence of section, acquires the slope of curve of each sequence；To removing
The slope of curve in each channel outside reference channel carries out arithmetic progression Relationship Comparison, and comparison result is exported to DBF Function detection
Module (6)；
The DBF function detection module (6) carries out the slope of curve comparison result of phase linearity analysis module (3) output
Analysis, and combine the DBF function of the aerial array rotation angle detection radar system of rotation angle synchronous recording device (5) output；
The clock synchronization unit (4), for generating ADC converting unit (1), Digital Down Converter Module (2), phase linearity point
Clock sync signal needed for analysing module (3) and rotation angle synchronous recording device (5)；
The rotation angle synchronous recording device (5), for recording the rotation angle value of aerial array in real time, the rotation angle value
Retention time synchronous corresponding relationship between data is received radar.
3. the phase linearity analysis system according to claim 2 for radar system DBF Function detection, feature exist
In the ADC converting unit includes: amplifier, filter and ADC conversion module；The amplifier and filter difference
For the intermediate-freuqncy signal that radio-frequency transmitter exports to be amplified and is filtered；The ADC conversion module is used for amplification
Digital collection is carried out with the intermediate-freuqncy signal after filtering processing.
4. the phase linearity analysis system according to claim 3 for radar system DBF Function detection, feature exist
In the Digital Down Converter Module includes: digital controlled oscillator, frequency mixer and sampling filter；The digital oscillator is used
In providing local oscillation signal for system；The frequency mixer is used to the intermediate-freuqncy signal of digital collection being transformed into baseband digital signal；
The sampling filter is used to lower the sampled data rate of baseband digital signal.
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