CN209560074U - A kind of imaging radar device - Google Patents
A kind of imaging radar device Download PDFInfo
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- CN209560074U CN209560074U CN201822068969.9U CN201822068969U CN209560074U CN 209560074 U CN209560074 U CN 209560074U CN 201822068969 U CN201822068969 U CN 201822068969U CN 209560074 U CN209560074 U CN 209560074U
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Abstract
The utility model discloses a kind of imaging radar devices, and wherein imaging radar device includes transmitting subsystem and receiving subsystem, and transmitting subsystem is that multichannel phased array emits subsystem, and receiving subsystem is multipath reception digital multi-beam steering array subsystem；It includes multichannel Direct Digital Frequency Synthesizers module, multichannel millimeter wave transmitting front-end module and transmitting antenna radiating element that multichannel phased array, which emits subsystem,；Multipath reception digital multi-beam steering array subsystem includes multichannel millimeter wave receiving front-end module, multichannel intermediate frequency amplification module and receiving antenna radiating element；The transmitting antenna radiating element with the receiving antenna radiating element is perpendicular intersects arrangement.The utility model proposes radar installations emitting portion use phased array, the advantages such as receiving portion uses digital multiple beam array, has total transmission power big, and Baseband processing algorithm is simple.
Description
Technical field
The utility model relates to the fields such as electronics, microwave radio, radar more particularly to a kind of imaging radar devices.
Background technique
Status
With the continuous development of millimeter-wave technology, millimetre-wave radar becomes research hotspot in recent years.Mm-wave imaging thunder
Up to since it is with two dimensional beam scan characteristic, it is particularly subject to the concern of domestic and foreign scholars.
Imaging radar needs to realize the scanning of two dimensional beam, and most traditional scheme is followed by using high-gain passive array
Two-dimensional scanning is realized by mechanical rotable antenna battle array in single radio frequency channel.Although channel is few at low cost, mechanical rotation speed
Too slowly, two-dimensional scanning overlong time is realized, image taking speed is by severely restricts.In order to realize the quickly imaging of high quality
Radar, existing technical solution mainly have: 1) using single transmission channel, receiving portion arranges n in total using n row n2A receive is led to
The phased array in road realizes being switched fast for wave beam using electronically controlled phase shifter.2) single transmission channel is used, receiving portion uses n
Row n arranges n in total2The digital multi-beam steering array of a receiving channel can generate multiple reception wave beams the same time and in numeric field reality
The scanning and synthesis of existing two dimensional beam.3) multiple-input and multiple-output (MIMO) radar scheme is used, by launching antenna array and receives day
Linear array is put into T-type.It is equivalent at a n with n receiver of n transmitter by the working condition of switching different transmitters
The virtual bore of row n column realizes the scanning of two dimensional beam.
The shortcomings that prior art
For imaging radar practical application request, current several technologies have disadvantages associated: scheme one is using phased
Battle array realizes the quick scanning of two dimensional beam, the disadvantage is that each channel is required to be equipped with expensive radio-frequency phase shifter.And phased array
The same time can only generate a wave beam, scan through a face scene, still need pencil type beam switching at least n2It is secondary.When need
When the pixel wanted is higher, required beam switchover number is greatly increased.Scheme two arranges n in total using using n row n2A reception
The digital multi-beam steering array in channel, can generate same time multiple reception wave beams, the program it is maximum the disadvantage is that base band pressure
It is too big.n2A digital multi-beam receiving channel needs connect an analog-digital converter (AD) behind each channel, amount to n2It is a
AD, the signal processing difficulty of base band has been significantly greatly increased in this.Scheme one, two realize that two-dimensional wave beam is swept by different technical solutions
Retouch, but have the shortcomings that one it is common be using port number it is too many, system cost of implementation is excessively high.Due to imaging radar resolution ratio
It is directly related with antenna array beam width.Such as to realize the imaging of better quality, port number needed for system can be in geometrical factor
Increase, it is excessively much to be difficult to realize so as to cause cost, power consumption.
Compared with the first two scheme, scheme three is obviously more excellent.Using virtual bore and MIMO radar correlation theory, merely with
The virtual bore of equivalent n row n column is realized to realize the scanning of two dimensional beam in 2n channel, and radio-frequency channel number greatly reduces.It lacks
Point is to need to switch using millimeter wave to toggle between different transmitters, this can be introduced into biggish Insertion Loss.And it utilizes
Switch switches over, and the same time, only one transmitter worked, and total transmission power is lower.In addition to this, this Working mould
Formula is higher for the processing requirement of Baseband algorithms, because n-channel transmitter does not work at the same time, baseband portion needs to carry out complicated
It is synchronous be aligned work and could successfully be equivalent to two-dimentional bore array.In digital baseband part, it is still necessary to two dimensions into
Row digital bea mforming this higher requirement is proposed for the processing capacity of base band.
Summary of the invention
The technical problem to be solved by the utility model is to proposing a kind of imaging radar device, it is able to use less lead to
Road number realizes the scanning of two dimensional beam, while can dramatically increase total transmission power, mitigates the difficulty of baseband signal processing unit point.
In order to solve the above-mentioned technical problem, the technical solution adopted in the utility model is:
A kind of imaging radar device, including transmitting subsystem and receiving subsystem, it is characterised in that: the transmitting subsystem
Emit subsystem for multichannel (road M) phased array, the receiving subsystem is that multichannel (road N) receives digital multi-beam steering array subsystem；
It includes multichannel Direct Digital Frequency Synthesizers module, multichannel millimeter wave transmitting front-end module and hair that multichannel phased array, which emits subsystem,
Antenna radiation unit is penetrated, Direct Digital Frequency Synthesizers module and millimeter wave transmitting front-end module are corresponded, directly counted all the way
The intermediate-freuqncy signal of word frequency Senthesizer module output is sent to millimeter wave transmitting front-end module all the way；Millimeter wave transmitting front-end module is defeated
Signal out is radiate by antenna radiation unit；Multipath reception digital multi-beam steering array subsystem includes that multichannel millimeter wave receives
Front-end module, multichannel intermediate frequency amplification module and receiving antenna radiating element, the receiving antenna radiating element every will connect all the way
The collection of letters number collects, and the reception signal that receiving antenna radiating element acquires is mixed by the millimeter wave receiving front-end module
Processing；The intermediate frequency amplification module amplifies the reception signal through Frequency mixing processing and filters；The transmitting antenna radiating element and institute
State the perpendicular intersection arrangement of receiving antenna radiating element.
Multipath reception digital multi-beam steering array subsystem includes multichannel millimeter wave receiving front-end module, multichannel intermediate frequency amplification mould
Block and antenna radiation unit.It will be got off first per signal acquisition is received all the way by receiving antenna radiating element, and pass through millimeter
High-frequency signal is mixed to Frequency by wave receiving front-end module.Amplify by intermediate frequency amplification module and receive signal and filter, most
It is sent into the base band signal process that digital analog converter (AD) carries out sampling and later period afterwards.
The utility model radar imaging method, comprising the following steps:
Step 1: entirely emit phased array subsystem in dark room calibration, the wave beam that can be realized vertical dimensions (pitching) is swept
It retouches.
Step 2: digital multi-beam steering array subsystem is entirely received in dark room calibration, can be realized horizontal dimensions (orientation)
Beam scanning.
Step 3: after the angular range for determining imaging, phased array beam will be emitted and be directed toward a certain of vertical dimensions (pitching)
A angle, the data for acquiring multichannel receiver carry out the digital beam scanning in horizontal dimensions (orientation), and this completes hang down
Lateral one-dimensional image result under straight dimension (pitching) some angle.
Step 4: transmitting phased array beats the different angle to vertical dimensions (pitching), and repeats step 3.Difference (is bowed
Face upward) the lateral one-dimensional image result under angle is stitched together, that is, it may make up a width complete imaging result.
Compared with prior art one or two, the imaging radar framework that the utility model provides is equivalent using M*N channel
Realize two dimensional beam scanning, significantly radio-frequency channel.Compared with scheme three, without introducing RF switch, additional Insertion Loss is not introduced.This
The radar installations that utility model proposes, firstly, difference, the utility model thunder cannot be worked at the same time with traditional MIMO radar transmitter
It can be worked at the same time up to device in all transmission channels of synchronization, this dramatically increases total transmission powers；Secondly, traditional
The Beam synthesis of MIMO radar vertical dimensions needs to go to synthesize by numeric field.However, in the Beam synthesis process of vertical dimensions
In, due to vertical dimensions, each transmitter is not to work at the same time, and the time delay of different transmitters is needed to take into account simultaneously
It is calibrated out, can just smoothly complete the Beam synthesis of vertical dimensions.The utility model proposes radar installations, the wave beam of vertical dimensions
Synthesis using phased array analog domain synthesis finish, baseband portion only need for horizontal dimensions receiving channel signal into
The one-dimensional digital bea mforming of row, alleviates the difficulty of base band signal process, while it is true not need complicated synchronization and alignment algorithm
The accuracy for protecting pitching (vertical) dimension Beam synthesis, for needing the higher scene of signal-to-noise ratio requirement to be obviously improved effect.
Detailed description of the invention
Fig. 1 be the utility model relates to Imager Architecture aerial array placing structure schematic diagram；
Fig. 2 be the utility model relates to Imager Architecture in Direct Digital Frequency Synthesizers modular structure schematic diagram；
Fig. 3 be the utility model relates to Imager Architecture in multichannel millimeter wave transmitting front-end module structural schematic diagram；
Fig. 4 be the utility model relates to Imager Architecture in multi-channel digital multi-beam a period of time system structure diagram；
Fig. 5 be the utility model relates to Imager Architecture in emit phased array subsystem beam scanning test result；
Fig. 6 be the utility model relates to Imager Architecture in multi-channel digital multi-beam array beam sweep test result；
Fig. 7 be the utility model relates to imaging radar in darkroom to single corner reflector imaging results figure；
Fig. 8 be the utility model relates to imaging radar in darkroom to two corner reflector imaging results figures (two angles
Reflector height is identical)；
Fig. 9 be the utility model relates to imaging radar in darkroom to two corner reflector imaging results figures (two angles
Reflector height is different).
Specific embodiment
It is described in further detail to the utility model with reference to the accompanying drawing:
As shown in Figure 1, the utility model imaging radar framework, including multichannel (road M) phased array emit subsystem 1, multichannel
(road N) receives digital multi-beam steering array subsystem 2, wherein M is greater than, is less than or equal to N；Emitting phased array antenna radiating element is in
Vertical configuration arrangement, reception digital multi-beam steering array radiating element is horizontally arranged, overall emission aerial array and receiving antenna array
Arrange T-shaped distribution.Wherein, multichannel phased array transmitting subsystem includes multichannel Direct Digital Frequency Synthesizers module, multichannel millimeter
Wave transmitting front-end module and antenna radiation unit；Multipath reception digital multi-beam steering array subsystem includes multichannel millimeter wave receiving front-end
Module, multichannel intermediate frequency amplification module and antenna radiation unit；In the embodiment of the utility model, transmitting phased array is shared
15 road transmission channels receive digital multi-beam steering array and share 16 tunnel receiving channels.
As shown in Fig. 2, it includes digital frequency synthesizer 3 (DDS) that multichannel Direct Digital Frequency Synthesizers module is every all the way,
The first SAW filter 4 is outputed signal to per DDS all the way, the first SAW filter outputs signal to the first driving amplifier
5, the first driving amplifier outputs signal to the second SAW filter 6, and the second SAW filter outputs signal to the second drive
Dynamic amplifier 7, the second driving amplifier export intermediate-freuqncy signal 8 by RF switch；Direct Digital Frequency Synthesizers module and milli
Decimetric emission front-end module corresponds, and the intermediate-freuqncy signal of Direct Digital Frequency Synthesizers module output is sent to millimeter all the way all the way
Wave transmitting front-end module；The signal of millimeter wave transmitting front-end module output is radiate by antenna radiation unit.Selected chip
Device (digital frequency synthesizer 3, the first SAW filter 4, the first driving amplifier 5, the second SAW filter 6, second
Driving amplifier 7, frequency mixer 9, bandpass filter 10 and driving amplifier 11 etc.) it can be in ADI, TI, MINI
It is selected in the product of circuits, Jia Shuodeng company production and sales.
As shown in figure 3, the multichannel millimeter wave front end of emission will be per the output of Direct Digital Frequency Synthesizers module all the way
Intermediate-freuqncy signal is sent to an input terminal of frequency mixer 9, and local oscillation signal is sent to another input terminal of frequency mixer, frequency mixer output letter
It is spuious number to filter out mirror image to bandpass filter 10, using sending after 11 amplified signal of driving amplifier to antenna radiation unit 12.
The transmitting antenna radiating element is double gradual change slot antenna units, and use 0.254mm dielectric constant for 2.2 it is micro-
Wave plate Taconic TLY-5 is designed and produced.
As shown in figure 4, the multipath reception digital multi-beam steering array subsystem include multichannel millimeter wave receiving front-end module, it is more
Channel intermediate frequency amplification module and antenna radiation unit.Signal acquisition every will be received all the way by receiving antenna radiating element 13 first
Get off, and high-frequency signal is mixed to by Frequency by millimeter wave receiving front-end module 14.Amplify by intermediate frequency amplification module
It receives signal and filters 15-19, be finally sent into the base band signal process that digital analog converter (AD) 20 carries out sampling and later period.
In order to verify the utility model proposes imaging radar structure and imaging method validity, based on the above method with
Structure devises based on transmitting phased array, receives the imaging radar system of digital multi-beam steering array.Wherein, transmitting phased array is total
15 channels receive digital multi-beam steering array and share 16 channels.
Explained below with reference to actual system example the utility model proposes imaging method.
Step 1: entirely emit phased array subsystem in dark room calibration, the wave beam that can be realized vertical dimensions (pitching) is swept
It retouches.15 channel emission phased array beam scan patterns of actual test are as shown in figure 5, wave beam can be in positive and negative 40 degree of angles
It is scanned.
Step 2: digital multi-beam steering array subsystem is entirely received in dark room calibration, can be realized horizontal dimensions (orientation)
Beam scanning.As shown in fig. 6, the reception digital multi-beam steering array beam scanning figure of test achieves the desired results, wave beam can be just
It is scanned in minus 40 degree.
Step 3: after the angular range for determining imaging, phased array beam will be emitted and be directed toward a certain of vertical dimensions (pitching)
A angle, the data for acquiring multichannel receiver carry out the digital beam scanning in horizontal dimensions (orientation), and this completes hang down
Lateral one-dimensional image result under straight dimension (pitching) some angle.
Step 4: transmitting phased array beats the different angle to vertical dimensions (pitching), and repeats step 3.Difference (is bowed
Face upward) the lateral one-dimensional image result under angle is stitched together, that is, it may make up a width complete imaging result.
In the test case in darkroom, angular range to be tested is tentatively predetermined to be in horizontal positive and negative 40 degree, vertically positive and negative
In 40 degree.- 40 degree of phased array beam direction vertical dimensions will be emitted first, horizontal dimensions receive battle array using digital multiple beam
Column carry out one-dimensional image, and this completes the horizontal one-dimensional imaging results under -40 degree vertical dimensions.Then phase will successively be emitted
It controls array beam to be directed toward on -39, -38 ..., 39,40 degree of position of vertical dimensions, and by transverse direction one-dimensional image knot under each angle
Fruit preserves, the image for being successively combined to the end.In darkroom for single corner reflector, two height same angulars are anti-
Emitter and the different corner reflector of two height carry out imaging experiment, imaging results such as Fig. 7, shown in 8,9, in test scene
Single corner reflector is placed at a distance in darkroom, and ambient background is absorbing material.Imaging results are as shown in fig. 7, be rendered as a list
One target point.Identical two corner reflectors of placing height separated by a distance in test scene, in corresponding imaging results (Fig. 8)
It is rendered as two target points at a distance.It placed two different corner reflectors of height, corresponding imaging in darkroom
As a result two target points equally separated in two horizontally separated height are illustrated in figure 9.To sum up, imaging results and actual imaging
Test scene more meets.
Compared with prior art one or two, imaging radar framework that the utility model provides using 15 transmission channels and
The Receiver aperture of 16 receiving channel equivalent implementation 15*16 realizes two dimensional beam scanning, greatly reduces radio-frequency channel number
Amount.Compared with scheme three, without introducing millimeter wave switch, additional Insertion Loss is not introduced.The utility model proposes framework with for the moment
It carves all transmission channels all to work at the same time, this not only significantly increases total transmission power, but also baseband portion does not need complexity
The synchronous accuracy for ensuring pitching dimension Beam synthesis with alignment algorithm.For needing the higher scene of signal-to-noise ratio requirement to have significantly
Castering action.Since the utility model emitting portion uses phased array, the wave beam of pitching dimension is carried out in analog domain
Synthesis.It only needs to carry out one-dimensional digital bea mforming for horizontal dimensions receiving channel signal in baseband portion, significantly reduce
The difficulty of base band signal process.
Above embodiments are only to illustrate the technical idea of the utility model, and the protection model of the utility model cannot be limited with this
Enclose, it is all according to the utility model proposes technical idea, any changes made on the basis of the technical scheme each falls within this reality
Within the scope of novel protected.
Claims (7)
1. a kind of imaging radar device, including transmitting subsystem and receiving subsystem, it is characterised in that: the transmitting subsystem is
Multichannel phased array emits subsystem, and the receiving subsystem is multipath reception digital multi-beam steering array subsystem；The phased paroxysm of multichannel
Penetrating subsystem includes that multichannel Direct Digital Frequency Synthesizers module, multichannel millimeter wave transmitting front-end module and transmitting antenna radiation are single
Member, Direct Digital Frequency Synthesizers module and millimeter wave transmitting front-end module correspond, all the way Direct Digital Frequency Synthesizers
The intermediate-freuqncy signal of module output is sent to millimeter wave transmitting front-end module all the way；The signal of millimeter wave transmitting front-end module output passes through
Antenna radiation unit is radiate；Multipath reception digital multi-beam steering array subsystem includes multichannel millimeter wave receiving front-end module, more
Channel intermediate frequency amplification module and receiving antenna radiating element, the receiving antenna radiating element will be per under reception signal acquisitions all the way
Come, the reception signal that the millimeter wave receiving front-end module acquires receiving antenna radiating element carries out Frequency mixing processing；In described
Frequency amplification module reception signal of the amplification through Frequency mixing processing simultaneously filters；The transmitting antenna radiating element and the receiving antenna spoke
Penetrate the perpendicular intersection arrangement of unit.
2. imaging radar device according to claim 1, it is characterised in that: the multichannel Direct Digital Frequency Synthesizers mould
Block is per all the way including digital frequency synthesizer, filtering and amplifying unit and RF switch；The digital frequency synthesizer is defeated
To the filtering and amplifying unit, the output signal of the filtering and amplifying unit is exported to the RF switch signal out.
3. imaging radar device according to claim 2, it is characterised in that: the filtering and amplifying unit include the first sound
Surface wave filter, the first driving amplifier, the second SAW filter and the second driving amplifier, per the number frequency all the way
Rate synthesizer outputs signal to the first SAW filter, and the first SAW filter outputs signal to the first driving amplifier,
First driving amplifier outputs signal to the second SAW filter, and the second SAW filter outputs signal to the second driving and puts
Big device, the second driving amplifier export intermediate-freuqncy signal by RF switch.
4. imaging radar device according to claim 1 to 3, it is characterised in that: the millimeter wave transmitting front-end module
Including frequency mixer, bandpass filter and third driving amplifier；Per the Direct Digital Frequency Synthesizers module output all the way
Intermediate-freuqncy signal send to an input terminal of frequency mixer, local oscillation signal is sent to another input terminal of frequency mixer, frequency mixer output
It is spuious that signal to bandpass filter filters out mirror image, using sending after third driving amplifier amplified signal to antenna radiation unit.
5. imaging radar device according to claim 4, it is characterised in that: the transmitting antenna radiating element is double gradual changes
Slot antenna unit, and using microwave board making of the loss angle tangent less than 15/10000ths at working frequency.
6. imaging radar device according to claim 5, it is characterised in that: the microwave plate is that 0.254mm dielectric is normal
The Taconic TLY-5 that number is 2.2.
7. imaging radar device according to claim 1 to 3, it is characterised in that: overall emission antenna radiation unit
The array that the array of formation and whole receiving antenna radiating element are formed is T-shaped, L-type, cross or inverted T shaped distribution.
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| CN201822068969.9U CN209560074U (en) | 2018-12-11 | 2018-12-11 | A kind of imaging radar device |
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| CN201822068969.9U CN209560074U (en) | 2018-12-11 | 2018-12-11 | A kind of imaging radar device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109407092A (en) * | 2018-12-11 | 2019-03-01 | 东南大学 | A kind of imaging radar device and imaging method |
| CN111157989A (en) * | 2019-12-24 | 2020-05-15 | 北京华研微波科技有限公司 | Millimeter wave processing device and millimeter wave scanning system |
| CN111983584A (en) * | 2020-07-17 | 2020-11-24 | 中国工程物理研究院应用电子学研究所 | MEMS galvanometer scanning control system of multi-shot mirror laser radar |
-
2018
- 2018-12-11 CN CN201822068969.9U patent/CN209560074U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109407092A (en) * | 2018-12-11 | 2019-03-01 | 东南大学 | A kind of imaging radar device and imaging method |
| CN109407092B (en) * | 2018-12-11 | 2024-05-14 | 东南大学 | Imaging radar device and imaging method |
| CN111157989A (en) * | 2019-12-24 | 2020-05-15 | 北京华研微波科技有限公司 | Millimeter wave processing device and millimeter wave scanning system |
| CN111983584A (en) * | 2020-07-17 | 2020-11-24 | 中国工程物理研究院应用电子学研究所 | MEMS galvanometer scanning control system of multi-shot mirror laser radar |
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