CN107329127A - A kind of phase linearity analysis method and system for radar system DBF Function detections - Google Patents
A kind of phase linearity analysis method and system for radar system DBF Function detections Download PDFInfo
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- CN107329127A CN107329127A CN201710623021.2A CN201710623021A CN107329127A CN 107329127 A CN107329127 A CN 107329127A CN 201710623021 A CN201710623021 A CN 201710623021A CN 107329127 A CN107329127 A CN 107329127A
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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 method and system for radar system DBF Function detections, this method and system are divided into some data segments by each road baseband digital signal to radio-frequency transmitter；Data segment after segmentation is converted into corresponding complex signal, the phase sequence of complex signal in each data segment is estimated；It is compared by phase sequence in each data segment with reference channel, draws relative phase sequence in each data segment of each passage, and calculate the average value of the relative phase sequence of each data segment；The sequence of the relative phase average value composition of each data segment in each passage is subjected to linearity estimation, the slope of curve of each sequence is tried to achieve, and acquisition DBF Function detection results are compared by the slope of curve to each passage.Above-mentioned phase linearity analysis method and system eliminate the influence of each passage proper phase, improve the precision of DBF Function detections, simplify the circuit structure of radar system by the analysis to each passage relative phase linearity.
Description
Technical field
The present invention relates to radar remote sensing technology field, and in particular to a kind of phase for radar system DBF Function detections
Linear analysis method and system.
Background technology
DBF (Digital Beam Forming) is digital beam forming technology, and its general principle is by each aerial array
The rf echo signal that unit is received, is transformed into intermediate-freuqncy signal, then be transformed into number through high-speed figure collection through radio-frequency transmitter
Word signal, then carries out amplitude-phase weighting processing in digital signal processing unit, the reception wave beam required for being formed.DBF
The advantages of technology has scanning fast and flexible, high resolution, anti-interference and clutter function admirable.DBF technologies are 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
The AESA that technology is realized, DBF technologies have a clear superiority in terms of system accuracy, flexibility, stability, defended
By growing interest in the application of star radar system.DBF technical principles are as shown in Figure 1.
Radar system antenna is made up of N number of bay, for the incoming signal of a direction (α angles), by by
Phase difference is mended caused by the different caused propagation differences (n Δ d, n=1,2 ... N) in reception antenna locus
Repay, then the complex signal after compensation is superimposed in the same direction, realize the Wave beam forming of the direction, the final maximum for obtaining the direction
Energy acceptance.D B F basic mathematical relational expressions are as follows：
(1) in formula, N is receiving channel number, CnFor n-th of receiving channel real signal through quadrature frequency conversion and width mutually school
The complex signal just obtained afterwards；WβnFor the weight coefficient in β directions, can further it be written as：
(2) in formula, d is bay interval；λ is signal wavelength；β is synthesis beam pointing-angle.
Complex signal CnCan further it 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.
θnCan further it be written as：
(4) in formula,The inherent delay of signal is received for the proper phase of n-th of receiving channel, namely the road, is depended on
In the hardware circuit characteristic of each receiving channel.(4) formula is substituted into (3) formula, complex signal C is further obtainednExpression formula：
From above-mentioned relation formula, the signal path phase introduced by each element position differenceIt can pass through
With weight coefficient WβnMultiplication is eliminated, and synthesis peak signal energy on α directions is may be implemented in as β=α.
According to above-mentioned relation formula, in order to test the reception DBF performances of a radar system, it is necessary to eliminate each receiving channel
Due to part characteristic it is inconsistent caused by proper phaseInfluence.In the prior art generally using school in receiving channel
The mode of accurate or total system external calibration.
Internal calibration mode from each receiving channel front end injection internal calibration signal of radar, is obtained after being handled through back end signal
The proper phase of each receiving channel.Internal calibration mode needs to increase internal calibration signal source, on the one hand adds system complex
Degree, simultaneously because internal calibration signal causes what is do not introduced in the channel phases obtained comprising antenna element without antenna element
Phase deviation, so that calibration accuracy is reduced.
External calibration mode, as an entirety, receiving channel is carried out using rotating electric field vector method generally using radar system
Proper phase is corrected.This calibration method complex operation, it is very high to measuring apparatus precision prescribed, and need to measure institute one by one
There is array element, correction time is longer.
The content of the invention
It is an object of the present invention to for solve existing radar system DBF method for testing performance exist calibration accuracy it is low,
There is provided a kind of phase linearity analysis method and system for radar system DBF Function detections for the technical problem of complex operation；
Using the system and method for the present invention, it is capable of the DBF functions of the test radar system of accurate quick, and receive without calibration
The influence of passage proper phase, it is adaptable to radar system DBF Function detection under far field condition.
To solve the above problems, a kind of phase linearity for radar system DBF Function detections that the present invention is provided is analyzed
Method, this method includes：
Step 1) intermediate-freuqncy signal that exports each radio-frequency transmitter carries out sample quantization respectively, the intermediate frequency after quantization believed
Number Digital Down Convert is carried out, obtain each road baseband digital signal；
Step 2) inter-channel synchronization sequential differentiation is carried out to each road baseband digital signal, synchronous sequence relation will be met
The baseband digital signal of each passage is divided into some data segments；
Step 3) data segment after segmentation is converted into corresponding complex signal, estimate the phase of complex signal in each data segment
Bit sequence；
Step 4) any passage is set as reference channel, phase sequence in each data segment of each passage is logical with reference
Phase sequence is compared in each data segment in road, draws relative phase sequence in each data segment of each passage, and calculate each
The average value of the relative phase sequence of data segment；
Step 5) sequence of the relative phase average value composition of each data segment in each passage is subjected to linearity estimation,
Try to achieve the slope of curve of each sequence；
Step 6) to the slope of curve progress arithmetic progression Relationship Comparison of each passage in addition to reference channel, if curve
Slope is unsatisfactory for arithmetic progression relation, then is judged to not meeting DBF functional requirements by its corresponding passage, otherwise, it is determined that being symbol
Close DBF functional requirements.
Present invention also offers a kind of phase linearity analysis system for radar system DBF Function detections, the system bag
Include：ADC converting units, Digital Down Converter Module, phase linearity analysis module, clock synchronization unit, anglec of rotation synchronous recording
Device and DBF function detection modules；
Described ADC converting units, the intermediate-freuqncy signal for each radio-frequency transmitter to be exported carries out sample quantization；
Described Digital Down Converter Module, for the intermediate-freuqncy signal after the quantization of ADC converting units to be carried out, numeral is lower to be become
Frequently, each road baseband digital signal is obtained, and baseband digital signal is exported to phase linearity analysis module；
Described phase linearity analysis module, for carrying out inter-channel synchronization sequential differentiation to each road baseband digital signal,
The baseband digital signal that each passage of synchronous sequence relation will be met is divided into some data segments；By the data segment after segmentation
Corresponding complex signal is converted to, the phase sequence of complex signal in each data segment is estimated；Any passage is set as reference channel,
Phase sequence in each data segment of phase sequence and reference channel in each data segment of each passage is compared, drawn every
Relative phase sequence in each data segment of one passage, and calculate the average value of the relative phase sequence of each data segment；Will be each logical
The sequence of the relative phase average value composition of each data segment carries out linearity estimation in road, tries to achieve the slope of curve of each sequence；It is right
The slope of curve of each passage in addition to reference channel carries out arithmetic progression Relationship Comparison, and comparative result is exported to DBF functions and examined
Survey module；
Described DBF function detection modules, are divided the slope of curve comparative result that phase linearity analysis module is exported
Analysis, and combine the DBF functions that the aerial array anglec of rotation of anglec of rotation synchronous recording device output detects radar system；
Described clock synchronization unit, for producing ADC converting units, Digital Down Converter Module, phase linearity analysis mould
Clock sync signal needed for block and anglec of rotation synchronous recording device；
Described anglec of rotation synchronous recording device, the rotation angle value for recording aerial array in real time, the anglec of rotation
Retention time synchronous corresponding relation between value receives data radar.
As the further improvement of above-mentioned technical proposal, described ADC converting units include：Amplifier, wave filter and
ADC modular converters；Described amplifier and wave filter be respectively used to radio-frequency transmitter export intermediate-freuqncy signal be amplified and
Filtering process；Described ADC modular converters are used to carry out digital collection to the intermediate-freuqncy signal after amplification and filtering process.
As the further improvement of above-mentioned technical proposal, described Digital Down Converter Module includes：It is digital controlled oscillator, mixed
Frequency device and sampling filter；Described digital oscillator is used to provide local oscillation signal for system；Described frequency mixer is used for number
The intermediate-freuqncy signal of word collection is transformed into low frequency signal；Described sampling filter is used for the sampled data rate for lowering low frequency signal.
The present invention is a kind of to be for the phase linearity analysis method of radar system DBF Function detections and the advantage of system：
(1) the complexity that radar system receives DBF Function detections is simplified, the testing time is reduced, test effect is improved
Rate.Existing DBF test needs to correct the influence of each passage proper phase, needed for this using high-precision measuring instrument and
Complicated means of testing, causes complex operation, the testing time is longer, and error is larger.A kind of radar that is used for of the invention receives system
The digital phase linear analysis device for DBF Function detections of uniting need not be using complicated special calibration instrument equipment, without complexity
Operating procedure；Data handling procedure is simple, calculates quick, the reception DBF functions of radar system can be detected in a short time.
(2), by the analysis to each passage relative phase linearity, the influence of each passage proper phase is eliminated, further
Improve the precision of DBF Function detections.And due to not influenceed by each passage proper phase, so radar system need not be set
The special internal calibration circuit that passage proper phase is corrected that is used for is put, so as to simplify the circuit design of radar system.
(3) full digital processing mode makes data sectional, signal complex transformation, linear analysis more flexible, and with higher
Processing signal to noise ratio and calculating speed.It can be sampled according to aerial array anglec of rotation flexible partition data segment, length according to ADC
Speed and quantization digit use different complex signal modes, according to the relative position between aerial array and transmitting antenna
Reference passage is selected, therefore data processing method is very flexible.It can be carried out using FPGA or FPGA+ high-speed dsps at data
Reason, results in higher processing signal to noise ratio and calculating speed, improves the ageing and standard of radar system DBF Function detections
True property.
Brief description of the drawings
Fig. 1 is DBF technical principle schematic diagrames；
Fig. 2 is that radar system receives DBF functional test principle schematics；
Fig. 3 shows for a kind of phase linearity analysis method flow for radar system DBF Function detections that the present invention is provided
It is intended to；
Fig. 4 is a kind of digital phase linear analysis device knot for radar system DBF Function detections that the present invention is provided
Structure schematic diagram；
Fig. 5 is the phase linearity analysis module structural representation in the present invention；
Fig. 6 is to each channel data section segmentation timing diagram using digital phase linear analysis device；
Fig. 7 is the example schematic applied digital phase linear analysis device in radar system DBF Function detections.
Reference
1st, ADC converting units 2, Digital Down Converter Module
3rd, phase linearity analysis module 4, clock synchronization unit
5th, anglec of rotation synchronous recording device 6, DBF function detection modules
31st, interchannel timing synchronization arbiter 32, passage internal data field dispenser
33rd, complex signal device 34, phase estimator in section
35th, phase comparator 36, intersegmental relative phase linearity estimator in passage in interchannel section
37th, inter-channel phase slope of curve comparator 41, the clock sync signal of ADC converting units
42nd, the clock sync signal of Digital Down Converter Module
43rd, the clock sync signal of interchannel timing synchronization arbiter
44th, the clock sync signal of passage internal data field dispenser
45th, the clock sync signal of anglec of rotation synchronous recording device
51st, first angle position signalling
52nd, second angle position signalling
Embodiment
With reference to the accompanying drawings and examples to a kind of numeral for radar system DBF Function detections of the present invention
Formula phase linearity analyzer is described in detail.
For the radar system using DBF systems, radar equipment receiving channel quantity itself is more, and circuit structure is complicated.For
The DBF functions of checking radar system need to eliminate receiving channel proper phaseInfluence,Calibration method is complicated, to surveying
Measure equipment requirement precision high, and the testing time is long.In order to solve this technical problem, the present invention devises a kind of for radar
System receives the digital phase linear analysis device of DBF Function detections, and phase linearity analysis method, can accurate quick
The reception DBF functions of radar system are tested, and receiving channel proper phase need not be calibratedInfluence, it is adaptable to far field bar
DBF Function detection is received under part to radar system.
Radar system receives DBF Function detections and generally carried 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 is λ, then the measuring distance for meeting far field condition is：
Set up radio-frequency signal source and transmitting antenna, make its withAdjust radio-frequency signal source
Pointed to the position of array antenna, aerial array is located in the range of the main beam of radio-frequency transmissions antenna as far as possible, (3dB wave beams are wide
Degree), to obtain larger received signal to noise ratio, the position 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, has array element N number of.
The distance of radio-frequency signal source and transmitting antenna to radar antenna array is R,And R ＞ ＞ l.
Each array element is connected with radio-frequency transmitter, has radio-frequency transmitter N number of.The phase of the intermediate-freuqncy signal of receiver output
Position is expressed asWhereinFor the proper phase of i-th of receiving channel；For due to receiving signal
Transmit the relative phase that path length difference is introduced.According to Fig. 2, the 1st array element by R of range transmission antenna is reference, then phase
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 angles it is smaller (θ≤±
5 °), Δ riCan approximate representation be Δ ri=(i-1) lsin θ, then
It is reference with passage one, then the relative phase of each receiving channel signal is expressed as follows：
In the range of θ angles smaller (θ≤± 5 °), sin θ ≈ θ, order(constant), then (1) formula can further indicate that
For：
It can be seen from (2) formula, in addition to reference channel, the relative phase and angle, θ of each channel signal are linear, and
The relative phase slope of curve of each passage is into arithmetic progression relation.Array day is rotated in orientation low-angle (θ≤± 5 °)
Line, can obtain phase value of each receiving channel at different θ angles；By carrying out digital processing to each channel receiving signal, point
Analyse the reception DBF functions of the i.e. detectable radar system of the linear relationship of its relative phase and angle, θ.
The test complexity of DBF Function detections is received the invention aims 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 invention provides a kind of phase linearity analysis method that DBF Function detections are received for radar system；As shown in figure 3, the party
Method specifically includes following steps：
Step 1) intermediate-freuqncy signal that exports each radio-frequency transmitter carries out sample quantization respectively, the intermediate frequency after quantization believed
Number Digital Down Convert is carried out, obtain each road baseband digital signal；
Step 2) inter-channel synchronization sequential differentiation is carried out to each road baseband digital signal, synchronous sequence relation will be met
The baseband digital signal of each passage is divided into some data segments；
Step 3) data segment after segmentation is converted into corresponding complex signal, estimate the phase of complex signal in each data segment
Bit sequence；
Step 4) any passage is set as reference channel, phase sequence in each data segment of each passage is logical with reference
Phase sequence is compared in each data segment in road, draws relative phase sequence in each data segment of each passage, and calculate each
The average value of the relative phase sequence of data segment；
Step 5) sequence of the relative phase average value composition of each data segment in each passage is subjected to linearity estimation,
Try to achieve the slope of curve of each sequence；
Step 6) to the slope of curve progress arithmetic progression Relationship Comparison of each passage in addition to reference channel, if curve
Slope is unsatisfactory for arithmetic progression relation, then is judged to its corresponding passage not meeting the requirement of DBF Function detections, otherwise, it is determined that
To meet the requirement of DBF Function detections.
Present invention also offers a kind of digital phase linear analysis device that DBF Function detections are received for radar system.
The phase linearity analyzer includes：ADC converting units, Digital Down Converter Module, phase linearity analysis module, clock are synchronous single
Member, anglec of rotation synchronous recording device and DBF function detection modules.
Described ADC converting units and the radio-frequency transmitter of front end are connected, for the intermediate frequency for exporting each radio-frequency transmitter
Signal carries out sample quantization, and each radio-frequency transmitter is connected with an ADC modular converter, if there is N number of penetrate in radar system
Frequency receiver, then have N number of ADC modular converters.There are strict synchronizing clock signals, it is ensured that each logical between each ADC modular converters
The temporal consistency of road sample quantization data.ADC converting units are connected with Digital Down Converter Module simultaneously, by the number after quantization
Word signal output is to Digital Down Converter Module.
Described Digital Down Converter Module is connected with ADC converting units 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 mould
Block.
Described phase linearity analysis module is connected with Digital Down Converter Module and DBF function detection modules.To input
Each road baseband digital signal carries out inter-channel synchronization sequential differentiation, will meet the base band of each passage of synchronous sequence relation
Data signal is divided into some data segments, the real signal data segment after segmentation is converted into corresponding complex signal, then estimate each
The phase sequence of complex signal in data segment；Then any passage is set as reference channel, by phase in each data segment of each passage
Phase sequence is compared in each data segment of bit sequence and reference channel, draws relative phase in each data segment of each passage
Bit sequence, and the average value of the relative phase sequence of each data segment is calculated, then by the relative phase of each data segment of each passage
The sequence of average value composition carries out linearity estimation, tries to achieve a slope of curve of each sequence；To each logical in addition to reference channel
The road slope of curve carries out arithmetic progression relationship analysis and compared, and comparative result is exported to DBF function detection modules.
Described DBF function detection modules are connected with phase linearity analysis module and anglec of rotation synchronous recording device.To phase
The slope of curve comparative result of bit line analysis module input is analyzed, and it is next to combine the input of anglec of rotation synchronous recording device
The aerial array anglec of rotation detect the reception DBF functions of the radar system.
In DBF function detection modules, according to above-mentioned relation formula (2), the relative phase of each receiving channel signal is carried out
Linear fit, abscissa is aerial array anglec of rotation θ, and ordinate is the relative phase of each channel signalIt can then calculateSlope k between θch2, kch3…kch NIf, kch2, kch3…kch NArithmetic progression relation is met, then judges the radar system
DBF functions can be realized, if being unsatisfactory for arithmetic progression relation, judge that the radar system can not realize that DBF functions or DBF are closed
Error into wave beam is larger.
Described clock synchronization unit and ADC converting units, Digital Down Converter Module, phase linearity analysis module and rotation
Gyration synchronous recording device is connected.Clock synchronization unit is used to produce ADC converting units, Digital Down Converter Module, phase linearity
Clock sync signal needed for analysis module and anglec of rotation synchronous recording device, it is ensured that ADC converting units, Digital Down Convert mould
Strict time synchronizing relation between block, phase linearity analysis module and anglec of rotation synchronous recording device.
Described anglec of rotation synchronous recording device is connected with phase linearity analysis module and DBF function detection modules.Rotation
Angle synchronous recording device is used for the orientation angle value of real-time record array antenna, and the angle value and radar are received between data
Keep strict time synchronized corresponding relation.Rotation corner synchronous recording device exports the angle value recorded to phase linearity
Analysis module and DBF function detection modules, the reception DBF functions for aiding in detection radar system.
Phase linearity analysis module based on above-mentioned functions, the phase linearity analysis module can further comprise：Interchannel
Timing synchronization arbiter, passage internal data field dispenser, complex signal device, phase estimator in section, phase in interchannel section
Intersegmental relative phase linearity estimator and interchannel relative phase slope comparator in comparator, passage.
Described interchannel timing synchronization arbiter is used for the synchronized relation for differentiating each passage digital baseband signal after demodulation,
Further subsequent treatment is done for meeting the data signal of synchronized relation.Because the clock of each ADC modular converters keeps synchronous,
Each channel sampled data points uniformity is sentenced so the differentiation of each channel baseband data signal synchronized relation can be converted into
Not, if the data of passage one points are P1, the data of passage two points are P2... passage N data points are PN, work as P1=P2=...=
PNWhen, then judge that the data of each passage meet synchronized relation, further subsequent treatment can be done；
Described passage internal data field dispenser is used to the continuous sampling data of each passage being divided into be adapted at segmentation
Data points in some data segments of reason, each passage corresponding data section are identical.Data points description such as table in the section of each passage
Shown in lattice 1, SP is met11=SP21=...=SPN1, SP12=SP22=...=SPN2... ..., SP1k=SP2k=...=SPNk；
Data points represent list in each channel section of form 1
| Sequence number | Data segment 1 is counted | Data segment 2 is counted | …… | Data segment k counts |
| Passage one | SP11 | SP12 | …… | SP1k |
| Passage two | SP21 | SP22 | …… | SP2k |
| …… | …… | …… | …… | |
| Passage N | SPN1 | SPN2 | …… | SPNk |
It is corresponding complex signal that described complex signal device, which is used for each data segment real signal after division, and
Complex signal after conversion is exported into section phase estimator；
Phase estimator is used for the phase for calculating complex signal in each data segment in described section, that is, calculates each complex data
The phase angle value of sampling point, obtains the phase sequence of each data segment in each passage, as shown in Table 2；
Phase sequence table in each channel section of form 2
| Sequence number | The phase sequence of data segment 1 | The phase sequence of data segment 2 | …… | Data segment k phase sequence |
| Passage one | θ11[...], common SP11Individual element | θ12[...], common SP12Individual element | …… | θ1k[...], common SP1kIndividual element |
| Passage two | θ21[...], common SP21Individual element | θ22[...], common SP22Individual element | …… | θ1k[...], common SP2kIndividual element |
| …… | …… | …… | …… | …… |
| Passage N | θn1[...], common SPN1Individual element | θn2[...], common SPN2Individual element | …… | θNk[...], common SPNkIndividual element |
The phase estimation method of complex signal is specifically included：By real signal by Hilbert transform method migration for letter in reply
Number, complex signal has real component and imaginary, such as：S=a+j*b, the phase of the complex signal can be calculated according to this relational expression
Position：Above calculating process needs the synchronized relation using clock synchronization unit holding between the two,
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 passage relative to any of which passage (the present embodiment in described interchannel section
In be described with passage one for reference channel) section in relative phase, obtain relative phase sequence in section, and calculate this
The average value of the average value of sequence, relative phase sequence and sequence is respectively as shown in form 3 and form 4.
Relative phase sequence in each channel section of form 3
The average of relative phase sequence in each channel section of form 4
Intersegmental relative phase linearity estimator is used for phase comparator output in interchannel section in described passage
The equal value sequence of relative phase of each passage carries out independent linear analysis.The k relative phase average i.e. to each passage is entered
Row linear fit, calculates the slope of each matched curve, such as form 5.
The slope of each passage matched curve of form 5
| Sequence number | The slope of each passage relative phase average matched curve |
| Passage one | kch1=0 |
| Passage two | kch2 |
| Passage three | kch3 |
| …… | …… |
| Passage N-1 | kch N-1 |
| Passage N | kch N |
Described inter-channel phase slope of curve comparator is used to compare intersegmental relative phase linearity estimator in passage
The slope of each passage matched curve of output, judges each passage slope value kch2, kch3... ..., kch NWhether arithmetic progression is met
Relation, and will differentiate that result is exported to DBF function detection modules.I.e. described in the above-mentioned table 5 of comparative result of the slope of curve
Each passage relative phase average matched curve slope kch2, kch3…kch N。
If meeting arithmetic progression relation, judge that the radar system can realize reception DBF functions；If be unsatisfactory for
Arithmetic progression relation, judges that the radar system can not realize that the error for receiving DBF functions or synthesis wave beam is larger, thus can enter
One step carries out hardware fault investigation to the radar system by DBF function detection modules or is to system sequence logic control signal
Whether no normal, clock signal synchronous etc., and performance is detected.
The above-mentioned digital phase linear analysis device and phase linearity analysis method of the present invention is in radar system DBF performances
Applications well has been obtained in detection field trial.Show through actual test result：The digital phase linear analysis device and phase
Linear analysis method operational excellence in the outfield DBF performance tests of radar system, can fast and accurately detect radar system
Reception DBF performances, operating procedure is simple, data processing fast and flexible.
Embodiment one
As shown in figure 4, providing a kind of digital phase that DBF Function detections are received for radar system in this example
Bit line analyzer, including：ADC converting units 1, Digital Down Converter Module 2, phase linearity analysis module 3, clock are synchronous single
Member 4, anglec of rotation synchronous recording device 5 and DBF function detection modules 6.Described ADC converting units 1 and Digital Down Converter Module
2 connections, the analog intermediate frequency signal that radio-frequency transmitter is exported carries out using quantization, and the digital medium-frequency signal after quantization is defeated
Go out to Digital Down Converter Module.ADC converting units 1 are controlled by clock synchronization unit, with Digital Down Converter Module 2, phase linearity
Strict time synchronizing relation is kept between analysis module 3, anglec of rotation synchronous recording device 5.
Described Digital Down Converter Module 2 is connected with ADC converting units 1 and phase linearity analysis module 3, for by ADC
The digital medium-frequency signal that the input of converting unit 1 comes transforms to base band, and output to phase linearity analysis module 3 carries out digital letter
Number processing.
Described phase linearity analysis module 3 is the core parts of the digital phase linear analysis device of the present invention.Its is defeated
Enter end to be connected with Digital Down Converter Module 2, the digital baseband signal of input is handled, including interchannel sequential differentiates, number
Split according to section, in complex signal, section phase estimation, inter-channel phase compare, interchannel relative phase linearity estimate analysis
Operation, its output end is connected with DBF function detection modules, analysis result is exported to DBF function detection modules.
Described clock synchronization unit 4 and ADC converting units 1, Digital Down Converter Module 2, phase linearity analysis module 3,
Anglec of rotation synchronous recording device 5 is connected, and synchronizing clock signals are provided for it, the clock synchronization unit 4 simultaneously with radar system its
The clock signal of his unit module keeps strict time synchronized.
Described anglec of rotation synchronous recording device 5 is connected with phase linearity analysis module 3 and DBF function detection modules 6,
The aerial array rotary angle signal recorded in real time is exported to phase linearity analysis module 3 and DBF function detection modules 6；
Anglec of rotation synchronous recording device 5 is controlled by clock synchronization unit 4, and the rotary angle signal of output has the gomma determined.
Described DBF function detection modules 6 are connected with phase linearity analysis module 3 and anglec of rotation synchronous recording device 5,
The DBF functions of radar system are divided according to each passage relative phase linear relationship and the corresponding aerial array anglec of rotation
Analysis, provides radar system and receives DBF Function detection results.
Described ADC converting units 1 are the analogue-to-digital converters parts of digital phase linear analysis device, and the ADC turns
Unit is changed to specifically include：Amplifier, wave filter and ADC modular converters.Described amplifier and wave filter is respectively used to radio frequency
The intermediate-freuqncy signal of receiver output is amplified and filtering process；Described ADC modular converters are used for amplification and filtering process
Intermediate-freuqncy signal afterwards carries out digital collection.The input of ADC converting units 1 passes through radio-frequency cable and radar radio-frequency transmitter
Intermediate-freuqncy signal output end is connected；Its output end is connected by low-frequency cable with Digital Down Converter Module 2；ADC converting units 1 with
Clock synchronization unit 4 is connected by radio-frequency cable.As shown in figure 5, clock synchronization unit 4 is synchronous by the clock of ADC converting units
Signal 41 is inputted to ADC converting units 1, it is completed analog-digital conversion and pass synchronous with other unit module setup times
System.
Described Digital Down Converter Module 2 includes：Digital controlled oscillator, frequency mixer and sampling filter.Described numeral is shaken
Swinging device is used to provide local oscillation signal for system；Described frequency mixer is used to the intermediate-freuqncy signal of digital collection being transformed into low frequency letter
Number；Described sampling filter is used for the sampled data rate for lowering low frequency signal.The input and ADC of Digital Down Converter Module 2
Converting unit 1 is connected；Its output end is connected by low-frequency cable with phase linearity analysis module 3；Digital Down Converter Module 2 is same
When be connected with clock synchronization unit 4 by radio-frequency cable；As shown in figure 5, clock synchronization unit 4 is by Digital Down Converter Module
Clock sync signal 42 is exported to Digital Down Converter Module 2, it is completed digital intermediate frequency to the conversion of digital baseband signal, number
Word down conversion module 2 keeps the time synchronizing relation with other unit modules.
As shown in figure 5, in the present embodiment, described phase linearity analysis module 3 includes：Interchannel timing synchronization is sentenced
Other device 31, passage internal data field dispenser 32, complex signal device 33, phase estimator 34 in section, phase ratio in interchannel section
Compared with intersegmental relative phase linearity estimator 36, inter-channel phase slope of curve comparator 37 in device 35, passage.Described is logical
Timing synchronization arbiter 31 is connected with Digital Down Converter Module 2 between road, the multi-channel digital inputted to Digital Down Converter Module 2
Baseband signal carries out sequential differentiation, judges whether each channel signal has strict time synchronizing relation, will have strict time
The data signal of synchronized relation is exported to passage internal data field dispenser 32.Interchannel sequential arbiter 31 passes through radio-frequency cable
It is connected with clock synchronization unit 4, receives the clock sync signal of timing synchronization arbiter between the input channel of clock synchronization unit 4
43, it is ensured that accuracy and uniformity that multi-channel data sequential differentiates；The described receiving channel of passage internal data field dispenser 32
Between the multichannel digital signal that inputs of sequential arbiter 31, the data of each passage are divided into some data segments, and keep each
Strict time synchronization between passage corresponding data section, the signal waveform of segmentation is as shown in Figure 6.Passage internal data field dispenser
32 receive the clock sync signal 44 of the input channel internal data field dispenser of clock synchronization unit 4, generate for splitting each passage
The timing control signal of data, the data segment 1 of each passage, data segment 2 ... ... data segment k is kept for strict lock in time
Relation, to ensure that the data points in each passage identical data section are consistent.Passage internal data field dispenser 32 is while and the anglec of rotation
Degree synchronous recording device 5 is connected, and receives the aerial array first angle position signalling 51 of the input of anglec of rotation synchronous recording device 5, root
The data segment, length of segmentation is determined according to the anglec of rotation, that is, determines that data segment splits the control sequential and logic of timing control signal；
Described complex signal device 33 is connected with phase estimator 34 in passage internal data field dispenser 32 and section, in receiving channel
The real signal that data segment dispenser 32 is inputted, converts thereof into corresponding complex signal, and export to phase estimator in section
34；Phase estimator 34 is connected with phase comparator 35 in complex signal device 33 and interchannel section in described section, based on
The phase of all complex signals in each data segment of each passage is calculated, the phase sequence corresponding with data segment is obtained, and export extremely
Phase comparator 35 in interchannel section；Phase comparator 35 and phase estimator 34 and passage in section in described interchannel section
Interior intersegmental relative phase linearity estimator 36 is connected, for calculating each passage relative to relative phase in the section of reference channel,
Relative phase sequence in section is obtained, and calculates the average value of relative phase sequence in section, result of calculation exports to passage intersegmental
Relative phase linearity estimator 36；Intersegmental relative phase linearity estimator 36 and phase in interchannel section in described passage
Bit comparator 35 and inter-channel phase slope of curve comparator 37 are connected, and are put down for the phase to all data segments in each passage
Average carries out linear fit, calculates the slope value of each passage matched curve, result of calculation is exported into oblique to inter-channel phase curve
Rate comparator 37；Described inter-channel phase slope of curve comparator 37 and intersegmental relative phase linearity estimator in passage
36 and DBF function detection modules 6 are connected, and for comparing the numerical relation between each channel plot slope, judge each channel plot
Whether slope meets arithmetic progression, and comparative result is exported to DBF function detection modules 6.
Described clock synchronization unit 4 is used to produce all clock signals needed for digital phase linear analysis device, production
The clock signal of raw other unit modules of clock signal Yu radar system keeps synchronized relation.Clock synchronization unit 4 and ADC
Converting unit 1, Digital Down Converter Module 2, interchannel timing synchronization arbiter 31, passage internal data field dispenser 32 are connected, defeated
Go out synchronizing clock signals, the signal of clock synchronization unit output has the characteristic of high freuqency accuracy and high frequency stability.
Described anglec of rotation synchronous recording device 5 is used for the azimuth angle value for recording radar antenna array in real time, angle value
Strict time synchronizing relation is kept between each channel digital signal.Export to the antenna array of passage internal data field dispenser
Row first angle position signalling 51 is used for the partitioning scheme for determining each channel data section；Export to the day of DBF function detection modules
Linear array second angle position signalling 52 is used for the data input that DBF Function detections are analyzed.
Described DBF function detection modules 6 are connected with phase linearity analysis module 3 and anglec of rotation synchronous recording device 5,
The DBF functions of radar system are divided according to each passage relative phase linear relationship and the corresponding aerial array anglec of rotation
Analysis, provides radar system and receives DBF Function detection results.
As shown in fig. 7, the application example schematic block for digital phase linear analysis device of the invention in radar system
Figure.The digital linear phase analyzer is applied to radar system and received in DBF Function detections, reduces test complexity, carries
High testing efficiency and accuracy of detection；Simultaneously without specially being corrected to each passage inherent delay, operating procedure is simplified；
Signal of change processing is carried out using digital form, the flexibility of signal transacting is considerably increased, results in higher processing
Signal to noise ratio and calculating speed, improve the ageing and accuracy of radar system DBF Function detections.
It should be noted last that, the above embodiments are merely illustrative of the technical solutions of the present invention and it is unrestricted.Although ginseng
The present invention is described in detail according to embodiment, it will be understood by those within the art that, to the technical side of the present invention
Case is modified or equivalent substitution, and without departure from the spirit and scope of technical solution of the present invention, it all should cover in the present invention
Right among.
Claims (4)
1. a kind of phase linearity analysis method for radar system DBF Function detections, it is characterised in that this method includes：
Step 1) intermediate-freuqncy signal that exports each radio-frequency transmitter carries out sample quantization respectively, the intermediate-freuqncy signal after quantization carried out
Digital Down Convert, obtains each road baseband digital signal；
Step 2) inter-channel synchronization sequential differentiation is carried out to each road baseband digital signal, each logical of synchronous sequence relation will be met
The baseband digital signal in road is divided into some data segments；
Step 3) data segment after segmentation is converted into corresponding complex signal, estimate the phase sequence of complex signal in each data segment
Row；
Step 4) any passage is set as reference channel, by each of phase sequence in each data segment of each passage and reference channel
Phase sequence is compared in data segment, draws relative phase sequence in each data segment of each passage, and calculate each data segment
Relative phase sequence average value；
Step 5) sequence of the relative phase average value composition of each data segment in each passage is subjected to linearity estimation, try to achieve each
The slope of curve of sequence；
Step 6) to the slope of curve progress arithmetic progression Relationship Comparison of each passage in addition to reference channel, if the slope of curve is not
Arithmetic progression relation is met, then is judged to not meeting DBF functional requirements by its corresponding passage, otherwise, it is determined that to meet DBF work(
It can require.
2. a kind of phase linearity analysis system for radar system DBF Function detections, it is characterised in that the system includes：ADC
Converting unit (1), Digital Down Converter Module (2), phase linearity analysis module (3), clock synchronization unit (4), the anglec of rotation are same
Walk logger (5) and DBF function detection modules (6)；
Described ADC converting units (1), the intermediate-freuqncy signal for each radio-frequency transmitter to be exported carries out sample quantization；
Described Digital Down Converter Module (2), for the intermediate-freuqncy signal after ADC converting units (1) quantization to be carried out, numeral 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)；
Described phase linearity analysis module (3), will for carrying out inter-channel synchronization sequential differentiation to each road baseband digital signal
The baseband digital signal for meeting each passage of synchronous sequence relation is divided into some 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 passage is set as reference channel, will be each
Phase sequence is compared in each data segment of phase sequence and reference channel in each data segment of passage, draws each passage
Relative phase sequence in each data segment, and calculate the average value of the relative phase sequence of each data segment；By each number in each passage
The sequence constituted according to the relative phase average value of section carries out linearity estimation, tries to achieve the slope of curve of each sequence；To except with reference to logical
The slope of curve of each passage outside road carries out arithmetic progression Relationship Comparison, and comparative result is exported to DBF function detection modules
(6)；
Described DBF function detection modules (6), are carried out to the slope of curve comparative result that phase linearity analysis module (3) is exported
Analysis, and combine the DBF functions that the aerial array anglec of rotation of anglec of rotation synchronous recording device (5) output detects radar system；
Described clock synchronization unit (4), for producing ADC converting units (1), Digital Down Converter Module (2), phase linearity point
Analyse the clock sync signal needed for module (3) and anglec of rotation synchronous recording device (5)；
Described anglec of rotation synchronous recording device (5), the rotation angle value for recording aerial array in real time, the rotation angle value
Retention time synchronous corresponding relation between receiving data radar.
3. the phase linearity analysis system according to claim 2 for radar system DBF Function detections, its feature exists
In described ADC converting units include：Amplifier, wave filter and ADC modular converters；Described amplifier and wave filter difference
For being amplified and filtering process to the intermediate-freuqncy signal that radio-frequency transmitter is exported；Described ADC modular converters are used for amplification
Digital collection is carried out with the intermediate-freuqncy signal after filtering process.
4. the phase linearity analysis system according to claim 3 for radar system DBF Function detections, its feature exists
In described Digital Down Converter Module includes：Digital controlled oscillator, frequency mixer and sampling filter；Described digital oscillator is used
In providing local oscillation signal for system；Described frequency mixer is used to the intermediate-freuqncy signal of digital collection being transformed into low frequency signal；It is described
Sampling filter be used to lower the sampled data rate of low frequency signal.
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