KR20170006124A - Microwave Imaging Apparatus and Method for Improving Measurement Quality - Google Patents

Microwave Imaging Apparatus and Method for Improving Measurement Quality Download PDF

Info

Publication number
KR20170006124A
KR20170006124A KR1020150096598A KR20150096598A KR20170006124A KR 20170006124 A KR20170006124 A KR 20170006124A KR 1020150096598 A KR1020150096598 A KR 1020150096598A KR 20150096598 A KR20150096598 A KR 20150096598A KR 20170006124 A KR20170006124 A KR 20170006124A
Authority
KR
South Korea
Prior art keywords
transmission
reception
signal
frequency
frequency signal
Prior art date
Application number
KR1020150096598A
Other languages
Korean (ko)
Inventor
김혁제
이종문
손성호
전순익
Original Assignee
한국전자통신연구원
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 한국전자통신연구원 filed Critical 한국전자통신연구원
Priority to KR1020150096598A priority Critical patent/KR20170006124A/en
Publication of KR20170006124A publication Critical patent/KR20170006124A/en

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N22/00—Investigating or analysing materials by the use of microwaves or radio waves, i.e. electromagnetic waves with a wavelength of one millimetre or more
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N22/00—Investigating or analysing materials by the use of microwaves or radio waves, i.e. electromagnetic waves with a wavelength of one millimetre or more
    • G01N22/02—Investigating the presence of flaws

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Radar Systems Or Details Thereof (AREA)

Abstract

The present invention relates to a microwave imaging apparatus and a method capable of restoring an internal image of an object to be measured with a nondestructive method using microwaves; increasing accuracy of measured data without impacts on direct offset caused by interference between transmitting and receiving microwaves, and leaking electromagnetic waves; and improving a quality of a restored image. To this end, a microwave transmission and reception apparatus for microwave imaging comprises a plurality of transmission and reception modules of which any one selected in order in accordance with a set value is operated in a transmission mode, and the other operated in a reception module.

Description

TECHNICAL FIELD The present invention relates to a microwave imaging apparatus and a microwave imaging apparatus,

The present invention relates to a microwave imaging apparatus and method, and more particularly, to a microwave imaging apparatus and method capable of acquiring measurement data of improved quality for restoring an internal image of a measurement object in a non-destructive manner using microwaves.

There is a technique for acquiring an image using microwaves to identify the interior of an arbitrary material by non-destruction. Microwave imaging technology is a technique to obtain the distribution of electrical characteristics inside the object, that is, the dielectric constant or conductivity distribution image, by transmitting and receiving microwaves using a microwave transceiver and an antenna and analyzing the amplitude and phase of the received scattering microwaves.

In a conventional microwave imaging technique, a microwave transceiver connected to a plurality of antennas and having a multi-channel microwave transmitting and receiving function uses a multi-channel transmission signal switch for multi-channel transmission and also uses LO Oscillator, local oscillator) to each channel using a frequency divider.

However, in such a conventional microwave imaging technology, when the isolation characteristics between the switch ports of the multi-channel transmission signal switch are not excellent, interference occurs between the transmission microwave and the reception microwave of the reception channel. As a result, the received microwaves interfere with each other and the amplitude and phase of the accurate scattered waves can not be measured. In addition, according to the related art, the LO frequency divider is used to supply the LO frequency to all the channels, and there is a problem that a DC offset occurs in the receiving channel due to leakage propagation of the LO frequency divider. There is a problem that the performance of the receiver is deteriorated.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a method and apparatus for recovering an internal image of a measurement object using a microwave in a non-destructive manner, And an object of the present invention is to provide a microwave imaging apparatus and method capable of enhancing the accuracy of measurement data without any influence and improving the quality of a restored image.

The technical problems of the present invention are not limited to the above-mentioned technical problems, and other technical problems which are not mentioned can be understood by those skilled in the art from the following description.

According to another aspect of the present invention, there is provided a microwave transceiver for microwave imaging, wherein one of the sequentially selected microwave transceivers operates in a transmission mode, Each module of the plurality of transmission / reception modules independently mounted separately generates a transmission frequency signal in the transmission mode using the reference frequency signal, and transmits the transmission frequency signal to the antenna And detects an amplitude and a phase of a scattered RF (Radio Frequency) signal received through the antenna using a local oscillator (LO) frequency signal generated in the reception mode.

The microwave transceiver includes a reference frequency generator; And a reference frequency divider for distributing the reference frequency signal generated in the reference frequency generator to the plurality of transmission / reception modules.

Wherein each of the plurality of transmitting and receiving modules includes a controller for storing data for one or more measured frequency indexes, and in the transmitting and receiving module of the transmitting mode, under control of the controller, And detect the amplitude and phase of each of the scattered RF signals received for each of the transmit frequency signals in the transmit and receive module of the receive mode.

Wherein each of the plurality of transmission / reception modules includes a controller for storing data on a transmission channel index and a reception channel index, wherein, in accordance with the control of the controller, And selecting the reception mode according to the reception channel index among the plurality of transmission / reception modules.

Wherein each of the plurality of transmission / reception modules comprises: a controller for controlling the transmission mode and the reception mode; And a frequency synthesizer for generating the transmission frequency signal in the transmission mode and generating the LO frequency signal in the reception mode under the control of the controller.

Wherein each of the plurality of transmitting and receiving modules comprises: a low noise amplifier for performing noise elimination and amplification on the received scattered RF signal; A mixer for synthesizing the LO frequency signal and the output of the low noise amplifier to generate an intermediate frequency signal; An AD converter for converting the intermediate frequency signal into a digital signal; And a controller for detecting the amplitude and phase of the received scattered RF signal from the digital signal.

According to another aspect of the present invention, there is provided a microwave transmitting / receiving method for microwave imaging, comprising: operating one of sequentially selected ones of a plurality of transmitting / receiving modules in a transmission mode; Generating a transmission frequency signal using the reference frequency signal and transmitting the generated transmission frequency signal to an antenna in each of the plurality of transmission / reception modules when operating in the transmission mode; And a plurality of transmitting and receiving modules, each of which receives a radio frequency (RF) signal received through the antenna using a local oscillator (LO) frequency signal generated using the reference frequency signal, And detecting the amplitude and the phase, wherein the plurality of transmission / reception modules are separately mounted and operated in the system.

The microwave transmitting / receiving method includes: a reference frequency generating step; And distributing the reference frequency signal generated in the reference frequency generation step to the plurality of transmission / reception modules.

Receiving module in the transmission mode according to the control of the controller by using a controller that stores data for one or more measurement frequency indexes in each of the plurality of transmission / reception modules, And detect the amplitude and phase of each of the scattered RF signals received for each of the transmit frequency signals in the transmit and receive module of the receive mode.

Receiving a plurality of transmission / reception modules, each of the plurality of transmission / reception modules, using a controller that stores data for a transmission channel index and a reception channel index, And selecting the reception mode according to the reception channel index among the plurality of transmission / reception modules.

In each of the plurality of transmission / reception modules, a frequency synthesizer that generates the transmission frequency signal in the transmission mode and generates the LO frequency signal in the reception mode under the control of the controller may be used.

Detecting the amplitude and phase comprises: performing noise cancellation and amplification on the received scattered RF signal; Synthesizing the LO frequency signal and the output of the low noise amplifier to generate an intermediate frequency signal; Converting the intermediate frequency signal into a digital signal; And detecting the amplitude and phase of the received scattered RF signal from the digital signal.

According to the microwave imaging apparatus and method of the present invention, since the microwave transmitting and receiving modules connected to the plurality of antennas are independently separated, assembled and operated, interference of the transmission and reception microwaves and measurement data By improving the accuracy, it is possible to improve the quality of the restored image based on the permittivity or conductivity distribution of the measured object in a non-destructive manner.

1 is a view for explaining a microwave imaging apparatus according to an embodiment of the present invention.
2 is a view for explaining a microwave transceiver of a microwave imaging apparatus according to an embodiment of the present invention.
3 is a flowchart illustrating an operation of a microwave transceiver of a microwave imaging apparatus according to an exemplary embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference numerals whenever possible, even if they are shown in different drawings. In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the difference that the embodiments of the present invention are not conclusive.

In describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. Also, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the relevant art and are to be interpreted in an ideal or overly formal sense unless explicitly defined in the present application Do not.

1 is a view for explaining a microwave imaging apparatus 100 according to an embodiment of the present invention.

Referring to FIG. 1, a microwave imaging apparatus 100 according to an embodiment of the present invention includes a plurality of antennas 10A, 10B, ..., 10N disposed around a measured object 11. As shown in FIG.

The microwave imaging apparatus 100 also transmits microwaves to one channel (e.g., 10A) of the plurality of antennas 10A, 10B, ..., 10N and receives microwaves from the remaining channels (e.g., 10B, ..., 10N) The microwave transceiver 13 includes a microwave transceiver 13 for receiving scattered microwaves so that each of the plurality of antennas 10A, 10B, ..., 10N sequentially becomes a transmission channel and the remaining channels become reception channels The microwave is transmitted and received, and the amplitude and the phase of the microwave scattered by the measured object 11 are detected.

The microwave imaging apparatus 100 includes an analysis module 14 that analyzes the amplitude and phase information of the received scattered microwave detected by the microwave transceiver 13 using a predetermined restoration algorithm, Based on the analysis of the amplitude and phase information of the received scattering microwave, the reconstructed image 15 based on the dielectric constant or the conductivity distribution based on the measured object 11. As shown in FIG. 1, when a substance 12 having an electrical property different from that of the substance 12 (for example, a part affected by a cancer in a patient) is contained in the object 11, . The analysis module 14 may be in the form of a dedicated device or may be a computer such as a PC (Personal Computer). When the analysis module 14 is implemented by a computer, the analysis module 14 may be implemented as a hardware such as a semiconductor processor, software in the form of a predetermined application program, or a combination thereof.

In particular, in the present invention, the microwave transceiver 13 does not use a multi-channel transmission signal switch for multi-channel transmission as in the prior art, and does not use a local oscillator (LO) frequency divider for multi- 50B, ..., and 50N) connected to the plurality of antennas 10A, 10B, ..., 10N are individually and separately assembled into a housing or a board such that the microwave transmitting / The accuracy of the measured data can be increased without affecting the DC offset due to the interference between the transmitting and receiving microwaves and the leakage propagation and the quality of the reconstructed image based on the permittivity or conductivity distribution of the measured object can be obtained in a non-destructive manner .

2 is a view for explaining a microwave transceiver 13 of a microwave imaging apparatus 100 according to an embodiment of the present invention.

Referring to FIG. 2, a microwave transceiver 13 for microwave imaging according to an embodiment of the present invention includes a processor 20, a reference frequency generator 30, a reference frequency distributor 40, and antennas 10A and 10B , ..., 10N, and includes transmission / reception modules 50A, 50B, ..., 50N connected to the antennas one by one.

The processor 20 controls the overall operation of each component of the microwave transceiver 13 and controls the operation of each of the transceiver modules 50A, 50B, ..., 50N and controls the operation of each of the transceiver modules 50A, 50B, ..., 50N) and stores the collected amplitude and phase data in a predetermined memory, and transmits the collected amplitude and phase data to an external analysis module 14 such as a computer.

The reference frequency f ref generated in the reference frequency generator 30 is input to the reference frequency divider 40 through the connection cable 31. The reference frequency divider 40 splits the reference frequency f ref 50B, ..., 50N through the cables 41A, 41B, ..., 41N. A reference frequency generator 30 may be a frequency of the OCXO (oven-controlled crystal oscillator), a reference frequency (f ref) can cause a signal, and the reference frequency (f ref) signal using the number to several tens MHz. The reference frequency divider 40 is implemented by a power divider, a clock distributor, or the like, and separately generates a reference frequency f ref signal having the same power to generate a plurality of transmission / reception modules 50A, 50B, ... , 50N). The reference frequency f ref signals supplied to the plurality of transmission / reception modules 50A, 50B, ..., 50N have the same phase, and the plurality of transmission / reception modules 50A, 50B, ..., (F RF ) signal and an LO frequency (f LO ) signal having the same phase.

Each of the plurality of transmission / reception modules 50A, 50B, ..., 50N that generates a transmission frequency (f RF ) signal and an LO frequency (f LO ) signal in each module to transmit and receive microwaves is connected to the antennas 10A, 10B And 50N are connected to the respective antennas through connection cables 58A, 58B, ..., 58N. The transmission / reception modules 50A, 50B, ..., 50N are connected to the antennas.

Each of the plurality of transmission and reception modules 50A to 50N includes a frequency synthesizer 51, an RF-LO path switch 59, an RF amplifier 52, a transmission-reception path switch 53, a low noise amplifier 54 A mixer 55, an analog-to-digital (AD) converter 56, and a controller 57. The controller 57 of each module under the control of the processor 20 may be a semiconductor control device such as an FPGA (Field Programmable Gate Array) type and may be connected to the transmission / reception modules 50A, 50B, ..., 50N to control the operation of each of the above components to cause each module to operate in a transmit mode or a receive mode.

The frequency synthesizer 51 receives the reference frequency f ref and generates a transmission frequency f RF signal according to a control value preset in the controller 57 or a LO frequency f LO signal . The frequency difference between the transmit frequency (f RF ) signal and the LO frequency (f LO ) signal is the intermediate frequency (f IF ).

When one module (for example, 50A) of the transmission / reception modules 50A, 50B, ..., 50N performs a transmission function, other modules (for example, 50B, ..., 50N) perform a reception function. In this case, a module (for example, 50A) that performs a transmission function generates the transmission frequency (f RF ) signal, transmits through the corresponding antenna, and the remaining modules (for example, 50B, ..., 50N) (f LO ) signal and detects the amplitude and phase from the signals received from the corresponding antennas. Since the transmission / reception modules 50A, 50B, ..., and 50N are separately assembled and mounted, interference between radio frequency ( RF ) frequencies and leakage of an LO frequency (f LO ) between modules does not occur.

For example, the transceiver module when the (e. G. 50A) is the transmission mode, a frequency synthesizer (51A) is the transmission frequency (f RF) occurs, and the generated transmission frequency (f RF) signals in accordance with the control of the controller (57A) The signal is transmitted to the RF amplifier 52A by switching to the RF path of the RF-LO path switch 59A under the control of the controller 57A. The RF amplifier 52A amplifies the transmission frequency f RF to a transmission power and under the control of the controller 57A the transmission-reception path switch 53A amplifies the transmission frequency f RF ) signal to be transmitted to the corresponding antenna, and the amplified transmission frequency (f RF ) signal is transmitted through the corresponding antenna.

Further, the transceiver module when the (e. G. 50B) the receiving mode, the frequency synthesizer (51B) includes a LO frequency (f LO) signal generates an LO frequency (f LO) signal in response to a control, and generation of the controller (57B) is LO switch of the RF-LO path switch 59B under the control of the controller 57B and inputted to the mixer 55B.

On the other hand, the antenna connected to the transmission / reception module (for example, 50B) in the reception mode receives the RF signal after the transmission frequency (f RF ) signal is scattered in the measured object 11, and the scattered RF signal received from the antenna Under the control of the controller 57B, to the low noise amplifier 54B through the receive path in the switching of the transmit-receive path switch 53B. The low noise amplifier 54B removes the noise of the received scattered RF signal, amplifies it, and inputs it to the mixer 55B.

Accordingly, the mixer 55B combines the input LO frequency (f LO ) signal with the received scattered RF signal to generate an intermediate frequency (f IF ) signal, and outputs the intermediate frequency (f IF ) signal. The AD converter 56B converts an intermediate frequency (f IF ) signal from the mixer 55B into a digital signal and the controller 57B performs Fast Fourier Transform (FFT) or the like on the digital signal to generate a received scattered RF signal It is possible to detect the amplitude and the phase of the signal. The phase may be a difference in phase angle compared to a predetermined reference signal or a transmit frequency (f RF ) signal.

3 is a flowchart illustrating an operation of the microwave transceiver 13 of the microwave imaging apparatus 100 according to an embodiment of the present invention.

First, one or more measurement frequency indexes are set in the plurality of transmission / reception modules 50A, 50B, ..., 50N, and a measurement channel index, that is, a transmission channel index and a reception channel index are set (60). Such a setting can be made by storing predetermined data in a semiconductor control device such as FPGA (Field Programmable Gate Array) type which is the controller 57 of each module. According to such a setting, measurements can be made for one or a plurality of transmission frequencies as described below, and all of the plurality of antennas 10A, 10B, ..., 10N or a part of channels according to the set channel index are transmitted or received Channel.

When the operation is started after such setting, the transmission / reception module corresponding to the channel is selected in accordance with the transmission channel index value, and is selected and operated in the transmission mode, and all remaining transmission / reception modules set in the reception mode (61).

Accordingly, the frequency synthesizer 51 of the transmission / reception module selected in the transmission mode generates the transmission frequency (f RF ) signal, and the frequency synthesizer 51 of the transmission / reception module set to the remaining reception mode generates the LO frequency (f LO ) (62). The transmission frequency (f RF ) signal generated in the transmission mode is transmitted through the corresponding antenna via the RF-LO path switch 59, the RF amplifier 52, and the transmission-reception path switch 53 in the corresponding module, The LO frequency (f LO ) signal generated in the mode is input to the mixer 55B via the RF-LO path switch 59 in the corresponding module and used for synthesis with the received scattered RF signal (63).

That is, the mixer 55B further receives the received scattered RF signal input via the transmission-reception path switch 53 and the low-noise amplifier 54. [ The mixer 55 generates an intermediate frequency f IF signal by combining the LO frequency f LO signal with the received scattered RF signal and the AD converter 56 converts the intermediate frequency f IF ) Signal to a digital signal, and the controller 57 can perform an FFT (Fast Fourier Transform) or the like on the digital signal to detect the amplitude and phase of the received scattered RF signal (64).

In accordance with steps 62 through 64, the next transmission frequency f RF is selected according to the control of the controller 57 of the corresponding module for all the measurement frequency indexes set in step 60, (65, 68) until the measurements at the frequencies for the first and second frequencies are completed.

When the detection of the amplitudes and phases of the received scattered RF signals is completed for all the measurement frequency indices set in step 60, the above steps 61 to 64 are repeated for the measurement channel index set in step 60, According to the control of the controller 57 of the module, the transmission / reception module corresponding to the corresponding channel of the next index is selected to operate in the transmission mode, all the remaining transmission / reception modules are selected to operate in the reception mode, It is done repeatedly until it is completed (66, 67).

As described above, the microwave transceiver 13 for microwave imaging according to the present invention is configured such that each of the microwave transmitting and receiving modules 50A, 50B, ..., 50N connected to the multiple antennas 10A, 10B, ..., By improving the accuracy of measured data without interference of DC offset due to interference between the transmitting and receiving microwaves and the transmission and reception microwave, it is possible to improve the quality of the reconstructed image based on the permittivity or conductivity distribution of the measured object in a non-destructive manner .

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention.

Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

The antennas 10A, 10B, ..., 10N,
Microwave transceiver (13)
Analysis module (14)
The processor 20,
The reference frequency generator 30,
The reference frequency distributor (40)
The transmission / reception modules 50A, 50B, ..., 50N,
Frequency synthesizer (51)
The RF-LO path switch (59)
RF Amplifier 52
The transmit-receive path switch 53,
Low Noise Amplifier (54)
The mixer (55)
An analog-to-digital (AD) converter 56,
The controller 57,

Claims (12)

A microwave transceiver for microwave imaging,
And a plurality of transmission / reception modules operated in a transmission mode, one of which is sequentially selected according to a set value, and the other operates in a reception mode,
Each module of the plurality of transmitting and receiving modules independently mounted separately generates a transmission frequency signal in the transmission mode using a reference frequency signal and transmits the transmission frequency signal to an antenna, and a local oscillator (LO) And detects the amplitude and the phase of the scattered RF signal received through the antenna using the frequency signal. The method according to claim 1,
A reference frequency generator; And
A reference frequency distributor for distributing the reference frequency signal generated by the reference frequency generator to the plurality of transmission /
And a microwave transceiver coupled to the microwave transceiver. The method according to claim 1,
Wherein each of the plurality of transmitting /
And a controller for storing data for one or more measured frequency indexes,
Wherein the control unit controls the transmission and reception module of the transmission mode to generate the respective transmission frequency signals for all of the measurement frequency indexes, and in the transmission and reception module of the reception mode, And detects the amplitude and phase for each of the RF signals. The method according to claim 1,
Wherein each of the plurality of transmitting /
And a controller for storing data for a transmission channel index and a reception channel index,
Wherein the controller is configured to sequentially select the transmission mode according to the transmission channel index among the plurality of transmission / reception modules and to select the reception mode according to the reception channel index among the plurality of transmission / reception modules. Transceiver. The method according to claim 1,
Wherein each of the plurality of transmitting /
A controller for controlling the transmission mode and the reception mode; And
A frequency synthesizer for generating the transmission frequency signal in the transmission mode and generating the LO frequency signal in the reception mode under the control of the controller;
And a microwave transceiver. The method according to claim 1,
Wherein each of the plurality of transmitting /
A low noise amplifier for performing noise removal and amplification on the received scattered RF signal;
A mixer for synthesizing the LO frequency signal and the output of the low noise amplifier to generate an intermediate frequency signal;
An AD converter for converting the intermediate frequency signal into a digital signal;
A controller for detecting the amplitude and phase of the received scattered RF signal from the digital signal;
And a microwave transceiver. A microwave transmitting / receiving method for microwave imaging,
Operating one of the plurality of transmission / reception modules sequentially selected according to a set value in a transmission mode and operating the remaining one in a reception mode;
Generating a transmission frequency signal using the reference frequency signal and transmitting the generated transmission frequency signal to an antenna in each of the plurality of transmission / reception modules when operating in the transmission mode; And
(RF) signal received through the antenna using an LO (Local Oscillator) frequency signal generated using the reference frequency signal when operating in the reception mode in each of the plurality of transmission / reception modules, And detecting a phase,
Wherein the plurality of transmitting and receiving modules are separately and independently mounted in the system. 8. The method of claim 7,
A reference frequency generating step; And
And distributing the reference frequency signal generated in the reference frequency generation step to the plurality of transmission / reception modules
Further comprising the steps of: 8. The method of claim 7,
In each of the plurality of transmitting / receiving modules,
Using a controller that stores data for one or more measured frequency indexes,
Wherein the control unit controls the transmission and reception module of the transmission mode to generate the respective transmission frequency signals for all of the measurement frequency indexes, and in the transmission and reception module of the reception mode, And detects the amplitude and phase of each of the RF signals. 8. The method of claim 7,
In each of the plurality of transmitting / receiving modules,
Using a controller that stores data for a transmit channel index and a receive channel index,
Wherein the controller is configured to sequentially select the transmission mode according to the transmission channel index among the plurality of transmission / reception modules and to select the reception mode according to the reception channel index among the plurality of transmission / reception modules. Transmitting / receiving method. 8. The method of claim 7,
In each of the plurality of transmitting / receiving modules,
And a frequency synthesizer for generating the transmission frequency signal in the transmission mode and generating the LO frequency signal in the reception mode under the control of the controller. 8. The method of claim 7,
Wherein the step of detecting the amplitude and phase comprises:
Performing noise cancellation and amplification on the received scattered RF signal;
Synthesizing the LO frequency signal and the output of the low noise amplifier to generate an intermediate frequency signal;
Converting the intermediate frequency signal into a digital signal;
Detecting an amplitude and a phase of the received scattered RF signal from the digital signal
Wherein the microwave transmission / reception method comprises the steps of:
KR1020150096598A 2015-07-07 2015-07-07 Microwave Imaging Apparatus and Method for Improving Measurement Quality KR20170006124A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020150096598A KR20170006124A (en) 2015-07-07 2015-07-07 Microwave Imaging Apparatus and Method for Improving Measurement Quality

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020150096598A KR20170006124A (en) 2015-07-07 2015-07-07 Microwave Imaging Apparatus and Method for Improving Measurement Quality

Publications (1)

Publication Number Publication Date
KR20170006124A true KR20170006124A (en) 2017-01-17

Family

ID=57990115

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020150096598A KR20170006124A (en) 2015-07-07 2015-07-07 Microwave Imaging Apparatus and Method for Improving Measurement Quality

Country Status (1)

Country Link
KR (1) KR20170006124A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102263142B1 (en) 2020-10-19 2021-06-10 앤스코 주식회사 Non-destructive automatic inspection fixture using micro wave transceiver module and scanner having the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102263142B1 (en) 2020-10-19 2021-06-10 앤스코 주식회사 Non-destructive automatic inspection fixture using micro wave transceiver module and scanner having the same

Similar Documents

Publication Publication Date Title
KR102085255B1 (en) System and method for measuring a plurality of rf signal paths
CN106841828B (en) Near field antenna test system and method based on frequency division
US9325433B2 (en) High dynamic range transceiver
US9210598B1 (en) Systems and methods for measuring passive intermodulation (PIM) and return loss
US9548806B2 (en) Radio measurement method and radio measurement apparatus using multi-antenna channel multiplex
EP3327961B1 (en) Receiver testing
CN103119845A (en) Method and apparatus for locating faults in communications networks
JPWO2019234946A1 (en) Radar device, failure detection method of radar device, and operation method of radar device
JP6389210B2 (en) Field strength distribution measuring apparatus and field strength distribution measuring method
JP2017181070A (en) Electric field intensity distribution measurement device and electric field intensity distribution measurement method
US11303366B2 (en) Passive harmonic test system and method
EP4066005A1 (en) Multiplexing radar beat signals
JP2006258644A (en) Phased-array antenna radar and transmitting chirp signal acquisition method for calibration
CN113132025B (en) Method for testing phase difference between antenna array elements of terminal, method for correcting phase difference between antenna array elements of terminal and testing equipment
KR101003509B1 (en) Apparatus and Method for Cancer Detection Using Electromagnetic wave
Vidotto et al. Software defined radio for vector network analysis: Configuration, characterization and calibration
CN114839608A (en) Electronic device with spatial ranging calibration capability
KR20170006124A (en) Microwave Imaging Apparatus and Method for Improving Measurement Quality
KR102090530B1 (en) Method and Apparatus for Cancelling Transmission Leakage Signal
KR101324172B1 (en) Method and device for toa calibration of multi-channel digital receiver
KR20200080592A (en) Multiple antenna system for calibration of signal amplitude and phase with high-resolution in the RF millimeter-wave
KR101724207B1 (en) Signal processing apparatus using electromagnetic wave and control method using thereof
Martens On MM-wave quasi-linear over-the-air modulated measurements and coupling effects
KR20150081537A (en) Apparatus for microwave frequency transmitting and receiving for microwave imaging
KR101905434B1 (en) Apparatus for measuring passive intermodulation distortion signal and method for using the same