CN104297732B - A kind of method and device producing MIMO radar signal based on frequency hopping - Google Patents

A kind of method and device producing MIMO radar signal based on frequency hopping Download PDF

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CN104297732B
CN104297732B CN201410626289.8A CN201410626289A CN104297732B CN 104297732 B CN104297732 B CN 104297732B CN 201410626289 A CN201410626289 A CN 201410626289A CN 104297732 B CN104297732 B CN 104297732B
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original frequency
signal
amplitude
value
module
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CN104297732A (en
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王文钦
程胜娟
邵怀宗
陈慧
杨帆
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University of Electronic Science and Technology of China
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/28—Details of pulse systems
    • G01S7/282—Transmitters

Abstract

The present invention relates to a kind of method and device producing MIMO radar signal based on frequency hopping, the method includes: produce the linear FM signal that multiple amplitude is not completely equivalent and original frequency is not completely equivalent；And to produce MIMO radar signal in the Hop duration section that linear FM signal is applied in the array element of MIMO radar.

Description

A kind of method and device producing MIMO radar signal based on frequency hopping
Technical field
The present invention relates to MIMO radar technical field, particularly relate to a kind of based on frequency hopping generation MIMO The method and device of radar signal.
Background technology
MIMO (multiple-input and multiple-output) radar can improve systematic function, therefore, is closed more and more Note.
One good MIMO radar signal demand meets big time-bandwidth product, low peak average ratio, good obscuring Characteristic and correlated performance.The method of existing generation MIMO radar signal mainly has: utilizes and launches signal Correlation matrix makes energy be transmitted into the signal generating method of preferable range angle；Consider all modelled signals simultaneously Characteristic and the correlation matrix method that produces signal；Optimization MIMO radar ambiguity function produces letter Number method.
The way of the signal that these methods existing can produce is less, typically can only produce two paths of signals, when When signal way increases, correlated performance drastically declines with fuzzy behaviour, it is impossible to meet the requirement in reality application.
Summary of the invention
It is an object of the invention to provide a kind of method and dress producing MIMO radar signal based on frequency hopping Put, it is possible to without producing multichannel MIMO radar signal in the case of supposing any prior information.
An embodiment provides a kind of side producing MIMO radar signal based on frequency hopping Method, including: produce the linear FM signal that multiple amplitude is not completely equivalent and original frequency is not completely equivalent； And to produce in the Hop duration section that linear FM signal is applied in the array element of MIMO radar MIMO radar signal.
An alternative embodiment of the invention provides a kind of dress producing MIMO radar signal based on frequency hopping Put, including: linear FM signal generation module, it is used for producing multiple amplitude and is not completely equivalent and original frequency The linear FM signal being not completely equivalent；And Signal averaging module, for linear FM signal is applied to To produce MIMO radar signal in Hop duration section in the array element of MIMO radar.
Accompanying drawing explanation
By combining accompanying drawing, embodiments of the invention are described, the present invention be may be better understood, In the accompanying drawings:
Fig. 1 show an enforcement of the method producing MIMO radar signal based on frequency hopping of the present invention The overall procedure schematic diagram of example；
The schematic flow sheet of one embodiment of the generation linear FM signal that Fig. 2 show in the inventive method；
What Fig. 3 showed in the inventive method chooses the flow process signal of an embodiment of original frequency and amplitude Figure；
What Fig. 4 showed in the inventive method chooses the schematic flow sheet of an embodiment of original frequency；
Fig. 5 is shown as an embodiment of the device producing MIMO radar signal based on frequency hopping of the present invention Schematic diagram.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearer, specifically real below in conjunction with the present invention Execute example and technical solution of the present invention is clearly and completely described by corresponding accompanying drawing.Obviously, described Embodiment is only a part of embodiment of the present invention rather than whole embodiments.Based on the enforcement in the present invention Example, the every other enforcement that those of ordinary skill in the art are obtained under not making creative work premise Example, broadly falls into the scope of protection of the invention.
The method producing MIMO radar signal based on frequency hopping of the present invention it is shown with reference to Fig. 1, Fig. 1 The overall procedure schematic diagram of one embodiment of 100.Method 100 can comprise the steps of 101 to 102.
In a step 101, the linear tune that multiple amplitude is not completely equivalent and original frequency is not completely equivalent is produced Frequently signal.
In one embodiment of the invention, the number of the linear FM signal of generation can be equal to MIMO thunder The product of the number of the Hop duration section on the element number of array reached and array element.That is: can be for each Each Hop duration section of array element produces a linear FM signal.
In one embodiment of the invention, step 101 may further include following sub-step 201 to 203. The schematic flow sheet of an embodiment of the step 101 in the inventive method it is shown with reference to Fig. 2, Fig. 2.
In sub-step 201, choose wheel number according to set in advance, carry out taking turns to original frequency and amplitude Choose.
Specifically, after original frequency and amplitude chosen all completing, be considered as having carried out one take turns right Choosing of original frequency and amplitude.
In one embodiment of the invention, sub-step 201 can comprise further following sub-step 301 to 302.The flow process of one embodiment of the sub-step 201 that reference Fig. 3, Fig. 3 show in the inventive method is shown It is intended to.
In sub-step 301, on the premise of supposing that described amplitude is equal, choose original frequency.
In one embodiment of the invention, can first suppose that the range value of all linear FM signals is 1.
In one embodiment of the invention, sub-step 301 can include following sub-step 401 to 415.Ginseng Examine the schematic flow sheet of an embodiment of the sub-step 301 that Fig. 4, Fig. 4 show in the inventive method.
In sub-step 401, initialize original frequency matrix.
Original frequency matrix may be used for record and produces the original frequency required for linear FM signal.
In one embodiment of the invention, initialized method can be to set one to have MTRow, Q row Empty matrix, wherein, MTRepresenting the element number of array in MIMO radar, Q represents the frequency hopping in an array element The number of persistent period section.
In sub-step 402, from parameter set set in advance, randomly select number many equal to array element number The original frequency of multiple array elements that the individual value composition being not mutually equal is applied in current Hop duration section to Amount.
In one embodiment of the invention, can from a parameter set set in advance 0,1 ..., and in G-1} with Choose M machineTThe individual value being not mutually equal, thus composition original frequency vector may be used for a frequency hopping continue time Between in section, the original frequency of the linear FM signal that each array element produces.
In sub-step 403, original frequency vector is placed in the relevant position of original frequency matrix.
In one embodiment of the invention, the original frequency vector obtained in sub-step 402 can with row to The mode of amount, is placed in the relevant position of original frequency matrix.Such as, if sub-step 402 obtained Original frequency vector is the linear FM signal in q-th Hop duration section, then by this original frequency Vector is placed in the q row of original frequency matrix.
In sub-step 404, the number of the identical element in every a line of calculating original frequency matrix.
Can be respectively to the every a line in original frequency matrix, the number of the identical element in this row of counting statistics.
In sub-step 405, it is judged that whether the maximum of the number of identical element exceedes in identical element number Limit value.
Identical element number higher limit can preset.The initial value of identical element number higher limit can set It is set to 1, it may be assumed that require that every a line of original frequency matrix does not has identical element.In follow-up sub-step 408 In, can be tuned up.
In sub-step 406, when the maximum of number of identical element is not less than identical element number higher limit Time, the original frequency vector chosen in sub-step 402 is stored in the relevant position of original frequency matrix and turns To sub-step 409.
Such as, if the original frequency vector obtained in sub-step 402 is for q-th Hop duration section Interior linear FM signal, then store the q row of original frequency matrix by this original frequency vector.
In sub-step 407, when the maximum of the number of identical element meets or exceeds in identical element number During limit value, determine whether whether the number of times again randomly selected exceedes set in advance randomly selecting on number of times Limit value.
The so-called number of times again randomly selected, refers to sub-paragraphs 402 to sub-step 409 original frequency square During battle array completely fills out, carry out the random choosing to original frequency vector in how many times sub-step 402 Take.
If the number of times again randomly selected randomly selects number of times higher limit not less than set in advance, do not deposit Store up this original frequency vector, but retain the element value in original frequency matrix and return step 402, again select Take original frequency vector.
In sub-step 408, randomly select on number of times when the number of times again randomly selected reaches set in advance During limit value, identical element number higher limit is tuned up and deletes all elements value in original frequency matrix, so Rear return step 402, restarts to choose original frequency vector to form original frequency matrix.
By sub-step 408, just relax the requirement to identical element number.
In sub-step 409, it may be judged whether completed the multiple array elements in all Hop duration sections The storage of original frequency vector.
Specifically, it is simply that judge whether to be arranged by the Q in original frequency matrix to completely fill out.If all Fill up, then enter step 410, otherwise return step 402, continue to randomly select original frequency vector and insert In original frequency matrix.
In sub-step 410, in calculating original frequency matrix, same original frequency repeats number.
Can M in original frequency matrixTIn × Q element value, statistics have repetition element value repeat Existing number.
In sub-step 411, it is judged that whether repeat number more than repetition number higher limit set in advance.
If not less than repetition number higher limit set in advance, then enter sub-step 412, otherwise forward sub-step to Rapid 413.
In sub-step 412, export original frequency matrix.
By output original frequency matrix, just complete the step choosing original frequency described by sub-step 301 Suddenly.
In sub-step 413, delete all elements value in original frequency matrix.
It practice, exactly original frequency matrix to be reverted to initial empty matrix state.
In sub-step 414, it is judged that whether the calculation times repeating number is exceeded meter set in advance Calculate number of times higher limit.
So-called to repeating the calculation times of number, refer in the process performing a sub-step 301 In, the number of times that sub-step 410 is performed.It also will be understood that become during performing a sub-step 301, Generated how many complete original frequency matrixes.
If the calculation times repeating number to have been exceeded calculation times higher limit set in advance, then enter Enter sub-step 415；Otherwise return sub-step 402, restart to come by the way of choosing original frequency vector Generate original frequency matrix.
In sub-step 415, number higher limit will be repeated and tune up.
By sub-step 415, just relax the requirement repeating number.
In sub-step 302, choose amplitude according to original frequency genetic algorithm.
In one embodiment of the invention, it is possible to use existing genetic algorithm, sub-step 301 is completed After, the amplitude of amplitude linearity FM signal is chosen.
In one embodiment of the invention, the step of following genetic algorithm can be used to choose amplitude.
1) coding.Can be in the way of using serial code, using overall for each potential solution amplitude collection as a dye Colour solid, will be cascaded one total dyeing of formation by the daughter chromosome of N number of amplitude concentrated of each amplitude Body.Specific coding mode is as follows:
B = 0.1 0.5 0.3 0.2 0.4 0.6 0.1 0.8 1 ⇒ 000011 010000 001001 000110 001100 010011 000011 011001 100000 ⇒ [ 000011 010000 001001 000110 001100 010011 000011 011001 100000 ]
2) producing random initial population, population scale is M.
3) fitness calculates.Fitness function can be:
E ( U ) = ω 1 Σ i = 0 M T max | τ | ≥ 1 / B | A ( u i , τ ) | + ω 2 Σ i = 0 M T - 1 Σ i ′ = i + 1 M T max τ | C ( u i , u i ′ , τ ) |
Wherein, C (ui,ui', τ) and it is the signal u on two array elements i and i'iAnd ui'Between cross-correlation function, A (ui,τ) For the signal u in array element iiAuto-correlation function, ω1, ω2For weighting coefficient values, MTFor in MIMO radar Array element sum, τ is time delay, B for launch signal uiThe bandwidth of (t), i=1,2 ..., MT。
4) select.According to fitness function, wheel disc stake method can be used to carry out selecting operation, with big probability Retain defect individual, can be so that the little individuality of fitness function.
5) intersect.Single-point crossover operator can be selected to carry out intersection operation.
6) variation.Some gene individual in population can be changed with a certain relatively small probability, produce new individual.
7) migrate.Population can be divided into some sub-populations, and each population is independently evolved, certain when arriving Between sub-population, individual migration is carried out during genetic algebra.
8) when reaching to preset maximum genetic algebra, algorithm terminates, the range value that output is chosen.
In sub-step 202, calculate corresponding to the original frequency and amplitude that a polling obtains in each battle array The autocorrelation sidelobe peak value of the signal in unit and the cross-correlation peak value of the signal in different array elements and value.
In one embodiment of the invention, above-mentioned and value can be calculated by equation below:
E ( U ) = ω 1 Σ i = 0 M T max | τ | ≥ 1 / B | A ( u i , τ ) | + ω 2 Σ i = 0 M T - 1 Σ i ′ = i + 1 M T max τ | C ( u i , u i ′ , τ ) |
Wherein, C (ui,ui', τ) and it is the signal u on two array elements i and i'iAnd ui'Between cross-correlation function, A (ui,τ) For the signal u in array element iiAuto-correlation function, ω1, ω2For weighting coefficient values, MTFor in MIMO radar Array element sum, τ is time delay, B for launch signal uiThe bandwidth of (t), i=1,2 ..., MT。
In sub-step 203, take turns according to minimum with value one and choose or with value less than threshold value set in advance One take turns and choose obtained original frequency and amplitude and produce linear FM signal.
In one embodiment of the invention, can by original frequency and amplitude are carried out choose more in sum The one of value minimum takes turns and chooses obtained original frequency and amplitude to produce linear FM signal.The present invention's In another embodiment, it is also possible to during many wheels are chosen, take turns that choose and value be less than in advance when a certain During the threshold value set, take turns with this and choose obtained original frequency and amplitude produces linear FM signal.
In one embodiment of the invention, linear FM signal can be produced by equation below
v i , q ( t ) = b i , q e j 2 πc i , q Δ f t + jπk r t 2
Wherein, i, q represent this linear FM signal vi,qT () can be used for the q-th frequency hopping in i-th array element In persistent period section, bi,qRepresent and value is minimum one take turns choose or and value be less than the one of threshold value set in advance Wheel chooses obtained amplitude, ci,qRepresent and value is minimum one take turns choose or and value be less than thresholding set in advance The one of value takes turns and chooses obtained original frequency, krFor the slope of this linear FM signal, Δ f is that this is linearly adjusted Frequently the bandwidth of signal.
In one embodiment of the invention, to the multiple lines in the same array element in MIMO radar For property FM signal, can be designed in time domain mutually orthogonal.In one embodiment of the present of invention In, Δ f can be arranged toWherein k can be any positive integer, and Δ t is Hop duration section Duration, with guarantee the multiple linear FM signals in the same array element in MIMO radar be time On territory mutually orthogonal.
In a step 102, when frequency hopping linear FM signal being applied in the array element of MIMO radar continues Between in section to produce MIMO radar signal.
Multiple linear FM signals v that will produce in step 101i,qT () applies the corresponding jumping of the array element in its correspondence Frequently in persistent period section, it is possible to produce MIMO radar signal.
In one embodiment of the invention, for any one array element in MIMO radar, can be by such as Lower formula, by superimposed to produce the transmitting signal of this array element for the linear FM signal produced in step 101:
u i ( t ) = Σ q = 0 Q - 1 v i , q ( t ) . s ( t - q . Δ t )
Wherein, Q represents total number of Hop duration section,
After the transmitting signal in all array elements in MIMO radar all produces according to above-mentioned formula, just The transmitting signal of MIMO radar can be obtained.
The side producing MIMO radar signal based on frequency hopping according to embodiments of the present invention described so far Method.The method can reduce autocorrelation sidelobe peak value and the cross-correlation peak value of multiple signals, obscuring mutually of signal Functional value has declined.Therefore, the MIMO radar signal produced by the inventive method can produced While multichannel orthogonal signalling so that correlated performance and the fuzzy behaviour of the signal of generation are more preferable.
The embodiment of the present invention further discloses the device producing MIMO radar signal based on frequency hopping.With reference to figure One enforcement of 5, Fig. 5 devices 500 producing MIMO radar signal based on frequency hopping being shown as the present invention The schematic diagram of example.Device 500 may include that linear FM signal generation module 501, is used for producing multiple width The linear FM signal that degree is not completely equivalent and original frequency is not completely equivalent；And Signal averaging module 502, To produce in the Hop duration section that linear FM signal is applied in the array element of MIMO radar MIMO radar signal.
In one embodiment of the invention, linear FM signal generation module 501 may further include: Original frequency and amplitude choose module, for choosing wheel number according to set in advance, to original frequency and amplitude Carry out taking turns choosing；Correlation value calculation module, for calculating original frequency and the amplitude institute that a polling obtains The autocorrelation sidelobe peak value of the corresponding signal in each array element and the cross-correlation of the signal in different array elements Peak value and value；And for basis and value minimum one take turns choose or and value be less than threshold value set in advance One take turns and choose obtained original frequency and amplitude and produce the module of linear FM signal.
In one embodiment of the invention, original frequency and amplitude are chosen module and be may further include: just Beginning frequency selection purposes module, for, on the premise of supposing that described amplitude is equal, choosing original frequency；And width Degree chooses module, for choosing amplitude according to original frequency genetic algorithm.
In one embodiment of the invention, original frequency is chosen module and be may further include: matrix is initial Change module, be used for initializing original frequency matrix；Original frequency vector chooses module, for from presetting Parameter set in randomly select the values composition that number is not mutually equal equal to array element number multiple and be applied to work as front jumping Frequently the original frequency vector of the multiple array elements in persistent period section；Matrix generation module, for original frequency to Amount is placed in the relevant position of original frequency matrix；The number computing module of identical element, is used for calculating initial frequency The number of the identical element in every a line of rate matrix；The availability deciding module of original frequency vector, is used for When the maximum of number of identical element is not less than identical element number higher limit, current frequency hopping will be applied to The original frequency vector of the multiple array elements in persistent period section is stored in the relevant position of original frequency matrix, directly To the storage completing the vector of the original frequency to the multiple array elements in all Hop duration sections；Original frequency Vector chooses module again, for when the number of identical element exceedes identical element number higher limit, in ginseng Manifold randomly selects original frequency vector again；And first choose module again, for ought be the most random The number of times chosen exceedes set in advance when randomly selecting number of times higher limit, identical element number higher limit is adjusted Again original frequency vector is randomly selected after all elements value greatly and in deleting original frequency matrix.
In one embodiment of the invention, original frequency is chosen module and be may further include: repeat Number computing module, repeats number for calculate same original frequency in original frequency matrix；Second Again module is chosen, for when repeating number more than repetition number higher limit set in advance and to repetition When the calculation times of appearance number is not less than calculation times higher limit set in advance, deleting original frequency square Again original frequency vector is chosen after all elements value in Zhen；And the 3rd choose module again, for working as Repeat number more than repetition number higher limit set in advance and the calculation times repeating number to be reached During to calculation times higher limit set in advance, number higher limit will be repeated and tune up and deleting initial frequency Again original frequency vector is randomly selected after all elements value in rate matrix.
The dress producing MIMO radar signal based on frequency hopping according to embodiments of the present invention described so far Put.Similar with above-mentioned method, this device can reduce autocorrelation sidelobe peak value and the cross-correlation of multiple signals Peak value, the cross ambiguity function value of signal has declined.Therefore, the MIMO produced by apparatus of the present invention Radar signal is while can producing multichannel orthogonal signalling so that the correlated performance of the signal of generation is with fuzzy Characteristic is more preferable.
The foregoing is only embodiments of the invention, be not limited to the present invention, for this area For technical staff, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, Any modification, equivalent substitution and improvement etc. made, within should be included in scope of the presently claimed invention.

Claims (2)

1. the method producing MIMO radar signal based on frequency hopping, is characterized in that, including:
Produce the linear FM signal that multiple amplitude is not completely equivalent and original frequency is not completely equivalent；And
It is applied to described linear FM signal in the Hop duration section in the array element of described MIMO radar produce described MIMO radar signal；
The step of the linear FM signal that the multiple amplitude of described generation is not completely equivalent and original frequency is not completely equivalent farther includes:
Choose wheel number according to set in advance, carry out taking turns choosing to described original frequency and described amplitude；
Calculate the autocorrelation sidelobe peak value of the signal in each described array element corresponding to described original frequency and described amplitude that a polling obtains and the cross-correlation peak value of the signal in different array elements and value；And
According to minimum one the taking turns and choose or described and value is less than the one of threshold value set in advance and takes turns and choose obtained described original frequency and the described amplitude described linear FM signal of generation of described and value；
Described choose wheel number according to set in advance, described original frequency and described amplitude carried out taking turns the step chosen and farther includes:
On the premise of supposing that described amplitude is equal, choose described original frequency；And
Described amplitude is chosen according to described original frequency genetic algorithm；
Described on the premise of supposing that described amplitude is equal, the step choosing described original frequency farther includes:
Initialize original frequency matrix；
The original frequency vector of multiple array elements that number is applied in current Hop duration section is randomly selected equal to multiple value compositions being not mutually equal of described array element number from parameter set set in advance；
Described original frequency vector is placed in the way of column vector the relevant position of described original frequency matrix；
Calculate the number of identical element in every a line of described original frequency matrix；
When the maximum of number of described identical element is not less than identical element number higher limit, the original frequency vector of the described multiple array elements being applied in current Hop duration section is stored in the relevant position of described original frequency matrix, until completing the storage of the vector of the original frequency to the multiple array elements in all Hop duration sections；
When the maximum of the number of described identical element meets or exceeds identical element number higher limit, described parameter set randomly selects described original frequency vector again；And
When the described number of times again randomly selected reach set in advance randomly select number of times higher limit time, described identical element number higher limit is tuned up and after all elements value deleted in described original frequency matrix, again randomly selects described original frequency vector.
2. produce a device for MIMO radar signal based on frequency hopping, it is characterized in that, including:
Linear FM signal generation module, for producing the linear FM signal that multiple amplitude is not completely equivalent and original frequency is not completely equivalent；And
Signal averaging module, for being applied in the Hop duration section in the array element of described MIMO radar produce described MIMO radar signal by described linear FM signal；
Wherein, described linear FM signal generation module farther includes:
Original frequency and amplitude choose module, for choosing wheel number according to set in advance, carry out taking turns choosing to described original frequency and described amplitude；
Correlation value calculation module, for the autocorrelation sidelobe peak value from the signal in different array elements that calculate the signal in each described array element corresponding to the described original frequency that obtains of a polling and described amplitude cross-correlation peak value and value；And
Take turns for according to described and value minimum one and choose or described and value is less than the one of threshold value set in advance and takes turns and choose obtained described original frequency and the module of the described amplitude described linear FM signal of generation；
Described original frequency and amplitude are chosen module and are farther included:
Original frequency chooses module, for, on the premise of supposing that described amplitude is equal, choosing described original frequency；And
Amplitude chooses module, for choosing described amplitude according to described original frequency genetic algorithm；
Described original frequency is chosen module and is farther included:
Matrix initialisation module, is used for initializing original frequency matrix；
Original frequency vector chooses module, for randomly selecting the original frequency vector of multiple array elements that number is applied in current Hop duration section equal to multiple value compositions being not mutually equal of described array element number from parameter set set in advance；
Matrix generation module, for being placed in the relevant position of described original frequency matrix in the way of column vector by described original frequency vector；
The number computing module of identical element, the number of the identical element in the every a line calculating described original frequency matrix；
The availability deciding module of original frequency vector, for the maximum of the number when described identical element not less than identical element number higher limit time, the original frequency vector of the described multiple array elements being applied in current Hop duration section is stored in the relevant position of described original frequency matrix, until completing the storage of the vector of the original frequency to the multiple array elements in all Hop duration sections；
Original frequency vector chooses module again, for when the maximum of the number of described identical element meets or exceeds identical element number higher limit, again randomly selects described original frequency vector in described parameter set；And
First chooses module again, for when the described number of times again randomly selected reach set in advance randomly select number of times higher limit time, described identical element number higher limit is tuned up and after all elements value deleted in described original frequency matrix, again randomly selects described original frequency vector.
CN201410626289.8A 2014-06-26 2014-11-09 A kind of method and device producing MIMO radar signal based on frequency hopping Expired - Fee Related CN104297732B (en)

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