CN105301568B - The method, apparatus and FDA radars of point-like wave beam are produced by FDA radars - Google Patents
The method, apparatus and FDA radars of point-like wave beam are produced by FDA radars Download PDFInfo
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- CN105301568B CN105301568B CN201510770119.1A CN201510770119A CN105301568B CN 105301568 B CN105301568 B CN 105301568B CN 201510770119 A CN201510770119 A CN 201510770119A CN 105301568 B CN105301568 B CN 105301568B
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- array element
- frequency
- increment
- frequency increment
- logarithm
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Classifications
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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 invention discloses the method, apparatus and FDA radars that point-like wave beam is produced by FDA radars, the FDA radars include the array element of multiple arrangements point-blank, and this method includes：Setting procedure；First frequency incremental computations step；Second frequency incremental computations step；Carrier frequency calculation procedure and transmission signal superposition step.
Description
Technical field
The present invention relates to FDA Radar Technology field, more particularly to the method, apparatus by FDA radars generation point-like wave beam
And FDA radars.
Background technology
Frequency diversity array radar (FDA, Frequency Diverse Radar) is in the same time in different array elements
Transmission signal is applied with different difference on the frequencies, i.e.,：The centre frequency for the signal that each array element is launched differs.These transmittings
The signal gone out spatially is overlapped mutually, can make FDA radar beams spatially show it is some on angle position plus
By force, other characteristics weakened on angle position.
The arrangement mode of the array element of FDA radars can arrange multiple array elements point-blank, i.e.,：In a manner of linear array
Arrangement.
Existing FDA radars linear array is when producing transmission signal, by positioned at the transmission signal frequency of the first of one end array element
Rate is set as reference frequency f0, the emission signal frequency from n-th of the array element of the array element successively to the right or to the left is f0+ n Δ f,
Δ f represents difference on the frequency, and Δ f is generally much less than f0.The transmission signal beam patterns of thus obtained FDA radars is as shown in figure 1, from figure
1 as can be seen that the position that existing FDA radar emissions signal beam is strengthened is in banding, and the transmission signal wave beam of this pattern is determined
FDA radars are determined and interdependency occur when judging the distance and angle of target, i.e.,：If it is not known that apart from size with regard to nothing
Method estimates the size of angle, equally, it is not known that the size of angle is also unable to estimate out the size of distance.Therefore, existing FDA
Radar also needs to add a set of special method to solve the sex chromosome mosaicism that interdepends of distance and angle.
The content of the invention
It is an object of the invention to provide it is a kind of by FDA radars produce point-like wave beam method, apparatus and FDA radars,
To solve the problems, such as that above-mentioned distance and angle present in prior art interdepend.
An embodiment provides a kind of method that point-like wave beam is produced by FDA radars, FDA radars include
The array element of multiple arrangements point-blank, this method include：Setting procedure：Set reference frequency, fundamental frequency increment and list
The variable number of individual array element, variable number are no less than two；First frequency incremental computations step：According to fundamental frequency increment and often
One array element calculates the first of each array element turned left from central array element to the distance of central array element in a manner of logarithm is incremental
Frequency increment, and the first frequency increment for each array element turned right from central array element is calculated in a manner of logarithm is incremental；Second
Frequency increment calculation procedure：According to fundamental frequency increment and the variable number of single array element, calculated in a manner of logarithm is incremental same
The second frequency increment of multiple carrier waves of one array element；Carrier frequency calculation procedure：By reference frequency, first frequency increment and
Two frequency increments are superimposed to obtain multiple carrier frequencies of each array element；And transmission signal superposition step：According to multiple carrier waves
Frequency produces transmission signal in corresponding array element and produces point-like wave beam after being superimposed.
An alternative embodiment of the invention provides a kind of device that point-like wave beam is produced by FDA radars, FDA radar bags
Array element containing multiple arrangements point-blank, the device include：Setting module, for setting reference frequency, fundamental frequency increases
The variable number of amount and single array element, variable number are no less than two；First frequency incremental computations module, for according to basic frequency
Rate increment and each array element calculate each turned left from central array element to the distance of central array element in a manner of logarithm is incremental
The first frequency increment of array element, and the first frequency for each array element turned right from central array element is calculated in a manner of logarithm is incremental
Increment；Second frequency incremental computations module, for the variable number according to fundamental frequency increment and single array element, is incremented by with logarithm
Mode calculate same array element multiple carrier waves second frequency increment；Carrier frequency computing module, for by reference frequency,
First frequency increment and second frequency increment is superimposed obtains multiple carrier frequencies of each array element；And transmission signal superposition mould
Block, for producing point-like wave beam after producing transmission signal and superposition in corresponding array element according to multiple carrier frequencies.
Another bright embodiment of this law provides a kind of FDA radars, comprising multiple arrangement array elements point-blank,
The transmission signal of array element has multiple carrier frequencies, and each carrier frequency is by first frequency increment, second frequency increment and sets in advance
Fixed reference frequency is superimposed to be obtained；Wherein, first frequency increment is according to the distance of each array element to central array element and in advance
The fundamental frequency increment of setting, it is incremented by and is incremented by from central array element logarithm of turning right from central array element logarithm of turning left；Second frequency increases
The number according to carrier frequency and fundamental frequency increment set in advance are measured, logarithm is incremented by with carrier index increase.
Brief description of the drawings
By reading the detailed description of hereafter preferred embodiment, it is various other the advantages of and benefit it is common for this area
Technical staff will be clear understanding.Accompanying drawing is only used for showing the purpose of preferred embodiment, and is not considered as to the present invention
Limitation.And in whole accompanying drawing, identical part is denoted by the same reference numerals.Wherein in the accompanying drawings, reference numeral
Alphabetic flag afterwards indicates multiple identical parts, when referring to these parts, will omit its last alphabetic flag.Attached
In figure：
Fig. 1 is launching beam schematic diagram caused by existing FDA radars；
Fig. 2 is the flow chart of one embodiment of the method that point-like wave beam is produced by FDA radars of the present invention；
Fig. 3 is the schematic block diagram of device one embodiment that point-like wave beam is produced by FDA radars of the present invention；
Fig. 4 is the schematic diagram of one embodiment of the FDA radars of the present invention；
Fig. 5 is the schematic diagram of another embodiment of the FDA radars of the present invention；
Fig. 6 is FDA radar emissions signal beam figure caused by technical solution of the present invention.
In the accompanying drawings, same or similar element is referred to using same or similar label.
Embodiment
The illustrative embodiments of the present invention are described in detail referring now to accompanying drawing.It should be appreciated that shown in accompanying drawing and
What the embodiment of description was merely exemplary, it is intended that explain the principle and spirit of the present invention, and not limit the model of the present invention
Enclose.
Generally, FDA radars can include multiple arrangement array elements point-blank, and the spacing between array element can phase
Deng.
With reference to figure 2, Fig. 2 is the stream of one embodiment 200 of the method that point-like wave beam is produced by FDA radars of the present invention
Cheng Tu.Embodiment 200 shown in Fig. 2 can comprise the following steps 201 to 205.
Step 201 is setting procedure：Set the variable number of reference frequency, fundamental frequency increment and single array element, carrier wave
Number is no less than two.
Generally, reference frequency f0Fundamental frequency increment Delta f can be much larger than.If for example, reference frequency is arranged to f0=
10GHz, then fundamental frequency increment can be arranged to Δ f=2kHz.Variable number in single array element is more, then spot beam
Side lobe levels (difference of main lobe energy and side-lobe energy) are bigger, and still, excessive variable number can increase the complexity of system.Cause
This, the selection of variable number needs to take into account the factor of these two aspects.In one embodiment of the invention, variable number can be
8。
Step 202 is first frequency incremental computations step：According to fundamental frequency increment and each array element to central array element
Distance, the first frequency increment of each array element turned left from central array element is calculated in a manner of logarithm is incremental, and with logarithm
Incremental mode calculates the first frequency increment for each array element turned right from central array element.
For linear array, central array element refers to array element in an intermediate position.When the sum of array element has odd number (2N
+ 1) when, central array element can be the N+1 array element from either end toward mediant；When the sum of array element has even number (2N
It is individual) when, central array element can be the n-th and the N+1 array element from either end toward mediant.
In one embodiment of the invention, can be according to the logarithm value and base of each array element to the distance of central array element
The product of this frequency increment obtains first frequency increment.Such as in case of array element sum is odd number, can be by as follows
The first frequency increment for the array element that the distance that formula (1) calculates central array element is i.
Δfi=Δ f log (| i |+1) (1)
Distance mentioned here, can be the space-number between some array element and central array element, such as：It is past from central array element
The right side, the distance between each array element and central array element i can be 1,2,3,4 etc. successively；Turned left from central array element, each array element with
The distance between central array element i can be -1, -2, -3, -4 etc. successively.And the distance i=0 of central array element itself.
Step 203 is second frequency incremental computations step：According to fundamental frequency increment and the variable number of single array element, with
The incremental mode of logarithm calculates the second frequency increment of same array element.
In one embodiment of the invention, can be obtained according to the logarithm value and the product of fundamental frequency increment of carrier index
To second frequency increment.Carrier index mentioned here, if referring to the variable number that is set in step 201 as M+1,
This M+1 carrier wave can be from 0 to M number consecutivelies.That is, multiple carrier waves in each array element can be from 0 to M successively
Numbering.Therefore, second frequency increment can be calculated by equation below (2).
Δfj=Δ f log (j+1) (2)
Wherein, j represents carrier index, and its span can be from 0 to M.
Step 204 is carrier frequency calculation procedure：Reference frequency, first frequency increment and second frequency increment is superimposed
Obtain multiple carrier frequencies of each array element.
In one embodiment of the invention, j-th of carrier frequency f of the array element for being i with the distance of central array elementi,jCan
To be obtained by equation below (3).
fi,j=f0+Δfi+Δfj (3)
Step 205 is transmission signal superposition step：According to multiple carrier frequencies transmission signal is produced in corresponding array element
And point-like wave beam is produced after being superimposed.
That is, caused transmission signal is multiple-frequency signal in each array element, its multiple carrier frequency value comes from
The result of calculation of step 204.
In one embodiment of the invention, choosing can also be optimized to the weighted value of each carrier wave in multiple-frequency signal
Take, to obtain more preferable point-like beam pattern.Specifically, the method for convex optimization can be used to search for one group of weighted value so that FDA
For the launching beam of radar in the case where the signal intensity of target area is certain, the signal intensity in nontarget area is minimum.
So far the method according to embodiments of the present invention that point-like wave beam is produced by FDA radars is described.With reference to figure 6 and right
Than Fig. 1 as can be seen that FDA radar emissions signal beam is in point-like according to caused by the inventive method, its energy can be focused
In desired target location, can overcome radar emission wave beam caused by existing method apart from angle interdepend the problem of.
Similar with this method, present invention also offers the device for producing point-like wave beam by FDA radars accordingly.
Fig. 3 show the schematic frame of device one embodiment 300 that point-like wave beam is produced by FDA radars of the present invention
Figure.FDA radars can include multiple arrangement array elements point-blank, and the spacing between these array elements can be with equal.
As shown in figure 3, device 300 can include：Setting module, for setting reference frequency, fundamental frequency increment and list
The variable number of individual array element, variable number are no less than two；First frequency incremental computations module, for according to fundamental frequency increment
Distance with each array element to central array element, each array element for being turned left from central array element is calculated in a manner of logarithm is incremental
First frequency increment, and the first frequency increment for each array element turned right from central array element is calculated in a manner of logarithm is incremental；
Second frequency incremental computations module, for the variable number according to fundamental frequency increment and single array element, with the incremental side of logarithm
Formula calculates the second frequency increment of multiple carrier waves of same array element；Carrier frequency computing module, for by reference frequency, first
Frequency increment and second frequency increment is superimposed obtains multiple carrier frequencies of each array element；And transmission signal laminating module,
For producing point-like wave beam after producing transmission signal and superposition in corresponding array element according to multiple carrier frequencies.
In one embodiment of the invention, first frequency incremental computations module may further include：For according to away from
From the product of logarithm value and fundamental frequency increment obtain the module of first frequency increment.
In one embodiment of the invention, second frequency incremental computations module may further include：For according to load
The logarithm value and the product of fundamental frequency increment of ripple numbering obtain the module of second frequency increment.
So far the device according to embodiments of the present invention that point-like wave beam is produced by FDA radars is described.With reference to figure 6 and right
Than Fig. 1 as can be seen that FDA radar emissions signal beam is in point-like according to caused by apparatus of the present invention, its energy can be focused
In desired target location, can overcome radar emission wave beam caused by existing apparatus apart from angle interdepend the problem of.
Present invention also offers a kind of FDA radars.
With reference to figure 4, Fig. 4 is the schematic diagram of one embodiment 400 of the FDA radars of the present invention.In the embodiment shown in Fig. 4
In, FDA radars 400 can include odd number arrangement array element point-blank, and the spacing between these array elements can be with equal.
The transmission signal of each array element of FDA radars 400 can have multiple carrier frequencies, and each carrier frequency is by the first frequency
Rate increment, second frequency increment and reference frequency set in advance is superimposed obtains.
Wherein, first frequency increment can be according to each array element to central array element A0Distance and set in advance basic
Frequency increment, it is incremented by and is incremented by from central array element logarithm of turning right from central array element logarithm of turning left.Second frequency increment can basis
The number of carrier frequency and fundamental frequency increment set in advance, with carrier index increase, logarithm is incremented by.
In one embodiment of the invention, first frequency increment can be equal to each array element to the distance of central array element
Logarithm value and fundamental frequency increment product.
In one embodiment of the invention, second frequency increment can be equal to the logarithm value and fundamental frequency of carrier index
The product of increment.
In one embodiment of the invention, j-th of carrier frequency f of the array element for being i with the distance of central array elementi,jCan
To be calculated by above-mentioned formula (1) to (3).For central array element A0The calculating of the multiple carrier frequencies of itself, also may be used
To arrive (3) using above-mentioned formula (1), only distance i therein can be set to 0.
With reference to figure 5, Fig. 5 is the schematic diagram of another embodiment 500 of the FDA radars of the present invention.In the implementation shown in Fig. 5
In example, FDA radars 500 can include even number arrangement array element point-blank, and the spacing between these array elements can phase
Deng.
In these array elements, two array element A positioned at middle position1And A-1Central array element can be considered as.
The transmission signal of each array element of FDA radars 500 can have multiple carrier frequencies, and each carrier frequency is by the first frequency
Rate increment, second frequency increment and reference frequency set in advance is superimposed obtains.
Wherein, the distance and basic frequency set in advance that first frequency increment can be according to each array element to central array element
Rate increment, from central array element A-1Logarithm of turning left is incremented by and from central array element A1Logarithm of turning right is incremented by.Second frequency increment can root
Number and fundamental frequency increment set in advance according to carrier frequency, with carrier index increase, logarithm is incremented by.
In one embodiment of the invention, first frequency increment can be equal to each array element to the distance of central array element
Logarithm value and fundamental frequency increment product.
In one embodiment of the invention, second frequency increment can be equal to the logarithm value and fundamental frequency of carrier index
The product of increment.
In one embodiment of the invention, j-th of carrier frequency f of the array element for being i with the distance of central array elementi,jCan
To be calculated by above-mentioned formula (1) to (3).For central array element A1And A-1Multiple carrier frequencies calculating, also may be used
To arrive (3) using above-mentioned formula (1), only distance i therein can be set to 1.
So far FDA radars according to embodiments of the present invention are described.
With reference to figure 6 and comparison diagram 1 as can be seen that the FDA radars of the present invention can be produced with good point-type beam pattern
The transmission signal of shape, there is preferably fixed point scan characteristic, therefore can remove apart from angle compared with existing signal beam
Dependence, improve the estimated accuracy of positioning.
Claims (6)
1. a kind of method that point-like wave beam is produced by FDA radars, the FDA radars include multiple arrange point-blank
Array element, it is characterized in that, methods described includes：
Setting procedure：The variable number of reference frequency, fundamental frequency increment and single array element is set, the variable number is no less than
Two；
First frequency incremental computations step：According to the distance of the fundamental frequency increment and each array element to central array element, with
The incremental mode of logarithm calculates the first frequency increment for each array element turned left from central array element, and in a manner of logarithm is incremental
Calculate the first frequency increment for each array element turned right from central array element；
Second frequency incremental computations step：According to the fundamental frequency increment and the variable number of single array element, it is incremented by with logarithm
Mode calculate same array element multiple carrier waves second frequency increment；
Carrier frequency calculation procedure：The reference frequency, the first frequency increment and the second frequency increment is superimposed
Obtain multiple carrier frequencies of each array element；And
Transmission signal is superimposed step：Transmission signal is produced in corresponding array element according to the multiple carrier frequency and produced after being superimposed
The raw point-like wave beam；
Wherein, the second frequency incremental computations step further comprises：
The second frequency increment is obtained according to the product of the logarithm value of carrier index and fundamental frequency increment.
2. according to the method for claim 1, it is characterized in that, the first frequency incremental computations step further comprises：
The first frequency increment is obtained according to the product of the logarithm value of the distance and fundamental frequency increment.
3. a kind of device that point-like wave beam is produced by FDA radars, the FDA radars include multiple arrange point-blank
Array element, it is characterized in that, described device includes：
Setting module, for setting the variable number of reference frequency, fundamental frequency increment and single array element, the variable number is not
Less than two；
First frequency incremental computations module, for according to the fundamental frequency increment and each array element to central array element away from
From calculating the first frequency increment for each array element turned left from central array element in a manner of logarithm is incremental, and be incremented by with logarithm
Mode calculate the first frequency increment of each array element turned right from central array element；
Second frequency incremental computations module, for the variable number according to the fundamental frequency increment and single array element, with logarithm
Incremental mode calculates the second frequency increment of multiple carrier waves of same array element；
Carrier frequency computing module, for by the reference frequency, the first frequency increment and the second frequency increment phase
Superposition obtains multiple carrier frequencies of each array element；And
Transmission signal laminating module, for producing transmission signal in corresponding array element according to the multiple carrier frequency and being superimposed
After produce the point-like wave beam；
Wherein, the second frequency incremental computations module further comprises for the logarithm value and fundamental frequency according to carrier index
The product of increment obtains the module of the second frequency increment.
4. device according to claim 3, it is characterized in that, the first frequency incremental computations module further comprises：
Product for the logarithm value according to the distance and fundamental frequency increment obtains the module of the first frequency increment.
5. a kind of FDA radars, comprising the array element multiple arrangements point-blank, it is characterized in that：The transmission signal of the array element
There are multiple carrier frequencies, each carrier frequency is by first frequency increment, second frequency increment and reference frequency phase set in advance
Superposition obtains；
Wherein, the first frequency increment increases according to the distance of each array element to central array element and fundamental frequency set in advance
Amount, it is incremented by and is incremented by from central array element logarithm of turning right from central array element logarithm of turning left；
Number and set in advance fundamental frequency increment of the second frequency increment according to carrier frequency, as carrier index increases
Add and logarithm is incremented by；
Wherein, the second frequency increment is equal to the logarithm value of carrier index and the product of fundamental frequency increment.
6. FDA radars according to claim 5, it is characterized in that：The first frequency increment is equal to the logarithm of the distance
Value and the product of fundamental frequency increment.
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2015577A1 (en) * | 1990-04-27 | 2008-12-22 | Plessey Overseas Limited | Improvements relating to radar systems |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10240497A1 (en) * | 2002-09-03 | 2004-03-11 | Robert Bosch Gmbh | Radar measuring device and method for operating a radar measuring device |
| US7151483B2 (en) * | 2004-05-03 | 2006-12-19 | Raytheon Company | System and method for concurrent operation of multiple radar or active sonar systems on a common frequency |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2015577A1 (en) * | 1990-04-27 | 2008-12-22 | Plessey Overseas Limited | Improvements relating to radar systems |
Non-Patent Citations (2)
| Title |
|---|
| Frequency Diverse Array Radar With Logarithmically Increasing Frequency Offset;Waseem Khan等;《IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS》;20141110;第14卷;第499-502页 * |
| 基于稀疏表示的频控阵MIMO雷达多目标定位;陈慧等;《雷达科学与技术》;20150630;第13卷(第3期);第259-264页 * |
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