CN210129037U - Double-station millimeter wave imaging device - Google Patents
Double-station millimeter wave imaging device Download PDFInfo
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- CN210129037U CN210129037U CN201920546432.0U CN201920546432U CN210129037U CN 210129037 U CN210129037 U CN 210129037U CN 201920546432 U CN201920546432 U CN 201920546432U CN 210129037 U CN210129037 U CN 210129037U
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Abstract
The utility model provides a double-station millimeter wave imaging device, which comprises a one-dimensional array receiving antenna, an electronic switch array, a millimeter wave frequency sweeping source, a frequency mixer, a power divider and a processor, wherein the millimeter wave frequency sweeping source is used for generating a millimeter wave signal of linear frequency modulation and transmitting the millimeter wave signal to the power divider; the one-dimensional array receiving antenna is used for receiving echo signals of a target object, and the electronic switch array can gate each path of the one-dimensional array receiving antenna and transmit the corresponding echo signals to the radio frequency port of the frequency mixer; the intermediate frequency port of the mixer outputs the mixed signal to the processor.
Description
Technical Field
The disclosure relates to the technical field of millimeter wave imaging, in particular to a double-station millimeter wave imaging device.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The millimeter wave with the frequency within the range of 30 GHz-300 GH is particularly suitable for the fields of human body security inspection, nondestructive detection, medical diagnosis and the like by virtue of the excellent characteristics of good penetrability, high imaging resolution, non-ionizing radiation and the like. The related millimeter wave imaging device and method become the current research focus.
In order to reconstruct an image of the object, a planar antenna array needs to be used. The antenna array topology structure comprises a plurality of structures such as single station, double station and multi-station. In the single-station structure, only one pair of transmitting antenna and receiving antenna with the same position works at the same time, and a two-dimensional antenna array is formed by using an electric scanning mode or a mechanical scanning mode. Compared with a single-station structure, the double-station structure antenna can acquire more target information, and the antenna configuration mode is more flexible.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problems, the present disclosure provides a dual-station millimeter wave imaging apparatus, which utilizes structural improvement, only one channel is needed for the transmitting and receiving links, and reduces system complexity and hardware cost.
According to some embodiments, the following technical scheme is adopted in the disclosure:
a double-station millimeter wave imaging device comprises a one-dimensional array receiving antenna, an electronic switch array, a millimeter wave frequency sweeping source, a frequency mixer, a power divider and a processor, wherein the millimeter wave frequency sweeping source is used for generating a linear frequency modulation millimeter wave signal and transmitting the linear frequency modulation millimeter wave signal to the power divider;
the one-dimensional array receiving antenna is used for receiving an echo signal of a target object, and the electronic switch array can gate each path of the one-dimensional array receiving antenna and transmit the corresponding echo signal to a radio frequency port of the frequency mixer;
and the intermediate frequency port of the mixer outputs the mixed signal to the processor.
In the scheme, the two optimized links are utilized, the image processing effect can be ensured, only one channel is needed for the transmitting link and the receiving link, and the system complexity and the hardware cost are reduced.
As an implementation manner, one path of the millimeter wave signal passes through the first amplifier and then is transmitted to the transmitting antenna.
In one embodiment, the echo signal is transmitted to a second amplifier, and the second amplifier amplifies the echo signal and transmits the amplified echo signal to a radio frequency port of a mixer.
The first amplifier is a power amplifier and the second amplifier is a low noise amplifier.
Compared with the prior art, the beneficial effect of this disclosure is:
the dual-station millimeter wave imaging device is formed by utilizing the millimeter wave frequency sweeping source, the power divider, the power amplifier, the transmitting antenna, the one-dimensional array receiving antenna, the electronic switch array, the low noise amplifier, the frequency mixer, the data acquisition module and the data processor, the electronic switch array sequentially gates each path of the one-dimensional array receiving antenna and transmits signals to the low noise amplifier, only one channel is needed for transmitting and receiving links, and the system complexity and the hardware cost are reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and are not to limit the disclosure.
FIG. 1 is a block diagram of an apparatus of the present disclosure;
fig. 2 is a reconstructed image resulting from the present disclosure.
The specific implementation mode is as follows:
the present disclosure is further described with reference to the following drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The method comprises the steps of providing a double-station millimeter wave imaging device, and forming the double-station millimeter wave imaging device by utilizing a millimeter wave frequency sweeping source, a power divider, a power amplifier, a transmitting antenna, a one-dimensional array receiving antenna, an electronic switch array, a low-noise amplifier, a frequency mixer, a data acquisition module and a data processor. Specifically, as shown in fig. 1:
the millimeter wave frequency sweeping source generates a linear frequency-modulated millimeter wave signal and transmits the linear frequency-modulated millimeter wave signal to the power divider;
the power divider divides the millimeter wave signal into 2 paths, one path is transmitted to the power amplifier, and the other path is used as a local oscillation signal and is input to a local oscillation port of the frequency mixer;
and the power amplifier transmits the amplified millimeter wave signal to a transmitting antenna. The transmitting antenna radiates the millimeter wave signal into the space for detection;
the one-dimensional array receiving antenna consists of N independent receiving antennas, receives the echo signal of the target object and transmits the echo signal to the electronic switch array;
the electronic switch array gates each path of the one-dimensional array receiving antenna in turn and transmits signals to the low-noise amplifier.
The low-noise amplifier amplifies the millimeter wave echo signal output by the electronic switch array and transmits the millimeter wave echo signal to a radio frequency port of the mixer.
The mixer outputs intermediate frequency signals to the data acquisition module, converts the intermediate frequency signals into digital signals and transmits the digital signals to the data processor.
The data processor adopts a loss compensation double-station millimeter wave imaging method to image the target object.
In this embodiment, the one-dimensional array receiving antenna is composed of 82 independent receiving antennas, and in other embodiments, the number of the one-dimensional array receiving antennas may be adaptively changed.
As an imaging method, comprising the steps of:
step 1: and establishing an echo model of the target object.
Wherein x isRiRepresents the coordinates of the ith receiving antenna on the horizontal axis; a (x, z) represents the reflection coefficient at the (x, z) target, x represents the horizontal transverse axis, z represents the range-wise coordinate, assuming the antenna of the dual-station configuration is located at the origin of the z-axis;
indicating the distance of the transmitting antenna to the target object,
denotes the distance, y, of the ith receiving antenna to the targetT0And yR0Respectively representing the coordinates of the transmitting antenna and the one-dimensional array receiving antenna on the transverse vertical axis; k is a radical ofrRepresents a wave number, and
ω represents the angular frequency of the millimeter wave signal and c represents the speed of light.
Step 2: and transverse Fourier transform, which transforms the echo signals to a space wave number domain:
wherein k isxRepresenting the spatial wavenumber in the x-direction.
And step 3: and multiplying the two-dimensional space wave number domain echo data by a wave number domain loss compensation factor, and performing loss compensation on the data of each slice in the distance direction.
And 4, step 4: multiplying the data after wave number domain loss compensation by a reference point phase index term
And primarily correcting defocusing caused by range migration of the one-dimensional array receiving antenna. The reference point phase is represented as:
wherein z' represents the distance from the target object to the reference point; z is a radical ofrefThe distance coordinate of the reference point is represented.
And 5: interpolation processing
In the wave number domain data of two-dimensional space, the wave number domain k of the x directionxAre uniformly distributed, and the wavenumber domain k in the z directionrThe effects of range migration due to the receiving antennas at different locations are non-uniformly distributed. Therefore, for the data after compensating for the loss in the wavenumber domain, for krInterpolation processing is carried out on the dimension to enable the data to be at krThe dimension is uniformly distributed to obtain
Where Stolt () represents interpolation.
Step 6: and (4) performing two-dimensional inverse Fourier transform to convert the echo signals back to a space domain.
The interpolated data is subjected to two-dimensional inverse fourier transform to obtain a' (x, z).
And 7: multiplying two-dimensional spatial domain data by a loss compensation factor for the spatial domain
Completing the loss compensation of the reconstructed image data to obtain the reflection coefficient of the target object
In this example, the target is assumed to be a 5 x 5 array of spot targets, with both azimuthal and range spacing of 0.1 m. The millimeter wave parameters used in the imaging process are shown in the following table, and the obtained reconstructed image is shown in fig. 2.
The dual-station millimeter wave imaging device is formed by the millimeter wave frequency sweeping source, the power divider, the power amplifier, the transmitting antenna, the one-dimensional array receiving antenna, the electronic switch array, the low noise amplifier, the frequency mixer, the data acquisition module and the data processor, the electronic switch array sequentially gates each path of the one-dimensional array receiving antenna and transmits signals to the low noise amplifier, only one channel is needed for a transmitting link and a receiving link, the system complexity and the hardware cost are reduced, loss compensation is realized, and the quality of reconstructed images is improved.
Of course, in other embodiments, other imaging methods may be selected.
As will be appreciated by one skilled in the art, embodiments of the present disclosure may be provided as a method, system, or computer program product. Accordingly, the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present disclosure may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and so forth) having computer-usable program code embodied therein.
The present disclosure is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the disclosure. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Although the present disclosure has been described with reference to specific embodiments, it should be understood that the scope of the present disclosure is not limited thereto, and those skilled in the art will appreciate that various modifications and changes can be made without departing from the spirit and scope of the present disclosure.
Claims (4)
1. A kind of double-station millimeter wave image device, its characteristic is: the millimeter wave frequency sweeping device comprises a one-dimensional array receiving antenna, an electronic switch array, a millimeter wave frequency sweeping source, a frequency mixer, a power divider and a processor, wherein the millimeter wave frequency sweeping source is used for generating a linear frequency-modulated millimeter wave signal and transmitting the linear frequency-modulated millimeter wave signal to the power divider;
the one-dimensional array receiving antenna is used for receiving an echo signal of a target object, and the electronic switch array can gate each path of the one-dimensional array receiving antenna and transmit the corresponding echo signal to a radio frequency port of the frequency mixer;
and the intermediate frequency port of the mixer outputs the mixed signal to the processor.
2. A dual-station millimeter wave imaging apparatus according to claim 1, wherein: one path of the millimeter wave signal passes through the first amplifier and then is transmitted to the transmitting antenna.
3. A dual-station millimeter wave imaging apparatus according to claim 1, wherein: and the echo signal is transmitted to a second amplifier, and the second amplifier amplifies the echo signal and transmits the amplified echo signal to a radio frequency port of the mixer.
4. A dual-station millimeter wave imaging apparatus according to claim 3, wherein: the first amplifier is a power amplifier and the second amplifier is a low noise amplifier.
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| CN201920546432.0U CN210129037U (en) | 2019-04-19 | 2019-04-19 | Double-station millimeter wave imaging device |
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