CN111157990A - Millimeter wave processing device and millimeter wave scanning system - Google Patents
Millimeter wave processing device and millimeter wave scanning system Download PDFInfo
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- CN111157990A CN111157990A CN201911349336.8A CN201911349336A CN111157990A CN 111157990 A CN111157990 A CN 111157990A CN 201911349336 A CN201911349336 A CN 201911349336A CN 111157990 A CN111157990 A CN 111157990A
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- millimeter wave
- signal
- processing apparatus
- wave processing
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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
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/89—Radar or analogous systems specially adapted for specific applications for mapping or imaging
- G01S13/90—Radar or analogous systems specially adapted for specific applications for mapping or imaging using synthetic aperture techniques, e.g. synthetic aperture radar [SAR] techniques
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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
- G01S7/35—Details of non-pulse systems
-
- 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
- G01S7/35—Details of non-pulse systems
- G01S7/352—Receivers
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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
- G01S7/41—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
Abstract
The present invention provides a millimeter wave processing apparatus that processes a transmission signal transmitted to an object to be scanned and processes an echo signal reflected from the object to be scanned, wherein the millimeter wave processing apparatus includes: the millimeter wave signal generating module comprises a broadband millimeter wave frequency source and a filtering unit, wherein the filtering unit is used for filtering and matching millimeter wave broadband signals generated by the broadband millimeter wave frequency source to form millimeter wave local oscillation signals; a transmit module, the transmit module comprising: an image frequency signal suppression section for converting a predetermined input signal into an I/Q signal; a transmitting side mixer for performing up-conversion of the predetermined input signal by mixing the millimeter wave local oscillation signal with the I/Q signal; and a filter for filtering signals having different frequencies from the signals subjected to the up-conversion processing to prevent crosstalk between the signals; and the receiving module is used for processing the echo signal reflected back from the object to be scanned.
Description
Technical Field
The present invention relates to a millimeter wave processing apparatus and a millimeter wave scanning system.
Background
With the development of radar technology, Synthetic Aperture Radar (SAR) has been expanded from the application of the simple military field to the civil field, from the remote detection of outer space to the ground to the detection of human hazardous articles at close range, and from the reconstruction of planar static two-dimensional images to three-dimensional dynamic imaging. The development of the microwave transceiver is inseparable with the progress of the microwave transceiver channel technology, and particularly from the current development of the microwave transceiver channel, the microwave transceiver channel has higher and higher working frequency band, wider and wider working frequency band, higher and higher integration level, better and better electrical property and lower cost.
For a microwave three-dimensional imaging transceiving system, the higher the working frequency band is, the more easily a large absolute bandwidth is obtained under the condition of a certain relative bandwidth, and further the more easily a high distance resolution is obtained; while a higher frequency band makes it easier to obtain a high azimuth and range resolution. Therefore, the working frequency band of the microwave three-dimensional imaging transceiving system has been developed from centimeter waves to 8mm, even 3 mm. Meanwhile, the higher the working frequency band is, the higher the cost of the microwave device and the assembly cost of the components are, so that a proper scheme needs to be selected on the premise that the performance requirement of the transceiving system is met.
At present, the millimeter wave processing device is mainly applied to the fields of aerospace, 5G communication, vehicle-mounted radar and the like, is used for realizing functions of space data communication, high-precision measurement positioning and the like, and generally has narrow working instantaneous bandwidth or is applied in a dot frequency mode.
Millimeter wave three-dimensional imaging is to form three-dimensional imaging geometry by transmitting broadband signals to a pitch dimension, an azimuth dimension and a distance dimension, so as to record the amplitude and phase information of target scattering and reconstruct a three-dimensional complex image of the target, wherein the image contains information such as the shape, the structure and the scattering characteristics of the target. In order to obtain a high-resolution range image and a clearer image quality, a broadband signal form is required. The existing millimeter wave processing device is basically a narrow-band system, so that the application of a three-dimensional imaging system cannot be met.
Moreover, when the operating bandwidth of the millimeter wave system is widened, spurs and interference are more easily caused, and therefore, higher requirements are placed on the transmission low-spurs design and the reception low-noise design of the circuit.
Specifically, in a transmission link of the millimeter wave processing device, up-conversion is performed first, and then the up-conversion is output through the power amplifier, so that two nonlinear working states exist, and meanwhile, a broadband millimeter wave transmission signal needs to be subjected to linear frequency modulation and pulse modulation, so that the introduced signal stray ratio is high. The signal stray directly affects the receiving sensitivity of the system and the final SAR image quality, and if the stray amplitude is high and directly falls into the broadband receiving system, the receiving system cannot filter the stray signal. Therefore, a low spurious scheme design for the transmit channel is needed.
Disclosure of Invention
In view of this, the present invention provides a millimeter wave processing apparatus and a millimeter wave scanning system, which are suitable for an active millimeter wave human body security inspection system, and perform millimeter wave signal transceiving and acquisition on close-range target information, and can realize low stray, low noise, high gain, and high image rejection of the system while adopting broadband receiving signals and transmitting signals.
According to an aspect of the present invention, there is provided a millimeter wave processing apparatus that processes a transmission signal transmitted to an object to be scanned and processes an echo signal reflected from the object to be scanned, wherein the millimeter wave processing apparatus includes: the millimeter wave signal generating module comprises a broadband millimeter wave frequency source and a filtering unit, wherein the filtering unit is used for filtering and matching a millimeter wave broadband signal generated by the broadband millimeter wave frequency source to form a millimeter wave local oscillation signal; a transmit module, the transmit module comprising: an image frequency signal suppression section for converting a predetermined input signal into an I/Q signal; a transmitting side mixer for mixing the millimeter wave local oscillation signal with the I/Q signal to realize up-conversion of the predetermined input signal; and a filter for filtering signals having a frequency different from that of the signals subjected to the up-conversion processing to prevent crosstalk between the signals; and a receiving module for processing echo signals reflected from the object to be scanned.
Preferably, the image frequency signal suppressing section converts a predetermined input signal into an I/Q signal using a 90 ° bridge.
Preferably, the receiving module further includes a low noise amplifier, and the low noise amplifier performs low noise matching on the echo signal received by the millimeter wave processing device.
Preferably, the low noise amplifier is designed using molybdenum copper slides and ground holes.
Preferably, the receiving module further comprises: the receiving side frequency mixer mixes the filtered echo signal with the millimeter wave local oscillation signal, so that the down-conversion of the echo signal is realized; and an image frequency signal suppression section that synthesizes I/Q signals formed by mixing the echo signals, thereby obtaining an intermediate frequency signal.
Preferably, the transmission module further comprises: and the flatness adjusting part on the transmitting side inputs the transmitting signal up-converted by the frequency mixer on the transmitting side into the flatness adjusting part on the transmitting side so as to adjust the flatness in the transmitting power band of the transmitting signal of the transmitting module.
Preferably, the receiving module further comprises: and a flatness adjustment unit on the reception side, which is provided between the low noise amplifier and the reception side mixer, and to which the echo signal subjected to low noise matching via the low noise amplifier is input, so as to adjust flatness in a reception gain band of the echo signal of the reception block.
Preferably, the flatness adjustment sections of the transmission side and the reception side each include: a positive slope amplifier that performs in-band gain compensation on the signal; and an inter-stage adjustable equalizer, wherein the inter-stage adjustable equalizer adjusts the gain slope of the signal.
Preferably, the operating bandwidth of the millimeter wave processing device is 30-40 GHz.
According to another aspect of the present invention, there is provided a millimeter wave scanning system for scanning an object to be scanned, including: the millimeter wave processing apparatus according to the above-described aspect; and a transmitting antenna and a receiving antenna, the millimeter wave processing device radiating a millimeter wave transmitting signal to the object to be scanned via the transmitting antenna and receiving a millimeter wave echo signal reflected from the object to be scanned via the receiving antenna.
Advantageous effects of the invention
The invention provides a millimeter wave processing device and a millimeter wave scanning system, wherein the adopted receiving signal and the adopted transmitting signal are broadband millimeter wave Linear Frequency Modulation (LFM) signals, and the working instantaneous bandwidth is as high as several GHz or even more than 10 GHz. In addition, the millimeter wave processing device and the millimeter wave scanning system have the advantages of low transmission up-conversion stray, moderate power, high image rejection degree, low receiving down-conversion noise, high gain and high image rejection degree.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention.
Fig. 1 is a block diagram of a millimeter wave scanning system according to an embodiment of the present invention.
Fig. 2 is a structural design diagram of a low noise amplifier in the millimeter wave processing apparatus according to the embodiment of the present invention.
Fig. 3 illustrates a frequency response curve of a mixer in the millimeter wave processing apparatus according to the embodiment of the present invention.
Fig. 4 illustrates a gain frequency response curve of a positive slope amplifier in a millimeter wave processing apparatus according to an embodiment of the present invention.
Fig. 5 illustrates an insertion loss frequency response curve of the equalizer in the millimeter wave processing apparatus according to the embodiment of the present invention.
List of reference numerals
100: millimeter wave scanning system
1: millimeter wave processing device
2: transmitting antenna
3: receiving antenna
10: transmitting module
11: image frequency signal suppression unit
12: transmitting side mixer
13: flatness adjustment unit
131: positive slope amplifier
132: interstage adjustable equalizer
20: receiving module
21: image frequency signal suppression unit
22: receiving side mixer
23: flatness adjustment unit
24: low noise amplifier
241: molybdenum copper slide
242: heat dissipation ground hole
243: printed board
244: structural shell
231: positive slope amplifier
232: interstage adjustable equalizer
30: millimeter wave broadband signal generation module
Detailed Description
The present invention will be described below based on examples, but the present invention is not limited to only these examples. In the following detailed description of the present invention, certain specific details are set forth. It will be apparent to one skilled in the art that the present invention may be practiced without these specific details. Well-known methods, procedures, and components have not been described in detail so as not to obscure the present invention.
The millimeter wave scanning system and millimeter wave processing apparatus of the present invention are explained with reference to fig. 1 to 5. Fig. 1 is a block diagram of a millimeter wave scanning system according to an embodiment of the present invention. Fig. 2 is a structural design diagram of a low noise amplifier in the millimeter wave processing apparatus according to the embodiment of the present invention. Fig. 3 illustrates a frequency response curve of a mixer in the millimeter wave processing apparatus according to the embodiment of the present invention. Fig. 4 illustrates a gain frequency response curve of a positive slope amplifier in a millimeter wave processing apparatus according to an embodiment of the present invention. Fig. 5 illustrates an insertion loss frequency response curve of the equalizer in the millimeter wave processing apparatus according to the embodiment of the present invention.
The millimeter wave scanning system and the millimeter wave processing device are applied to a human body security check processing device. The millimeter wave processing apparatus of the present invention processes a transmission signal transmitted to an object to be scanned and processes an echo signal reflected from the object to be scanned.
In one embodiment of the present invention, as shown in fig. 1, a millimeter wave processing apparatus 1 includes: the millimeter wave broadband signal generating module 30, where the millimeter wave broadband signal generating module 30 includes a broadband millimeter wave frequency source and a filtering unit, and the filtering unit performs filtering matching on a millimeter wave broadband signal generated by the broadband millimeter wave frequency source to form a millimeter wave local oscillation signal; a transmission module 10, the transmission module 10 comprising: an image frequency signal suppression section 11, the image frequency signal suppression section 11 being configured to convert a predetermined input signal into an I/Q signal, thereby implementing image frequency signal suppression processing on the predetermined input signal before up-conversion; a transmission-side mixer 12, the transmission-side mixer 12 mixing the millimeter-wave local oscillation signal with the I/Q signal converted by the image frequency signal suppressing section 11 to realize up-conversion of a predetermined input signal; and the filter filters signals with different frequencies from the signals subjected to the up-conversion processing. For example, signals of different frequencies from the rear system, such as high-frequency signals, low-frequency signals, digital signals, analog signals, etc., existing in the circuit portion of the transmitting module are subjected to filtering processing, thereby preventing crosstalk of signals before the frequency conversion of the front stage from leaking to the rear stage system to cause crosstalk between the signals. The millimeter wave processing apparatus 1 further includes a receiving module 20 for processing echo signals reflected back from the object to be scanned.
The millimeter wave processing device realizes the low-spurious design of the transmission channel by the filter matching design of the millimeter wave broadband signal serving as the local oscillation signal, the image frequency signal suppression design of the preset input signal and the filter processing of the circuit signal in the transmission module.
As shown in fig. 1, as an example, the image frequency signal suppression section 11 converts a predetermined input signal into an I/Q signal using a 90 ° bridge. In addition, image frequency signal suppression can be performed by a rational layout of the circuit, particularly by making the electrical lengths of the I-path and the Q-path uniform, in addition to using the 90 ° bridge.
In order to improve the quality of human body imaging images, a receiving channel in the millimeter wave processing device can also amplify weak echo signals of a human body with low noise and high gain so as to improve the signal-to-noise ratio of the system, improve the sensitivity of the system and improve the detection precision of suspicious articles. The receiving channel firstly increases the gain and simultaneously reduces the noise inside the system as much as possible, so that the reduction of the noise coefficient is the key point for improving the sensitivity of the system.
Therefore, in the embodiment of the present invention, as shown in fig. 1, as an example, the receiving module 20 may further include a low noise amplifier 24 for performing low noise matching of the system, and the low noise amplifier 24 performs low noise matching on the echo signal received by the millimeter wave processing apparatus. Preferably, the low noise amplifier 24 has a certain gain to suppress the noise of the later stage, and has a high compression point to maintain the linear region of its gain and the dynamic range of the system.
As an example of the structural design of the low noise amplifier, in the structural design diagram of the low noise amplifier shown in fig. 2, the low noise amplifier 24, the molybdenum-copper carrier plate 241, the printed board 243, and the structural cover 244 are disposed one on another from top to bottom, wherein the heat dissipation ground hole 242 is disposed in the printed board 243, so that the power consumption and the operating temperature of the low noise amplifier can be controlled to suppress the generation of self thermal noise by the design of the molybdenum-copper carrier plate 241 and the heat dissipation ground hole 242.
Further preferably, as shown in fig. 1, the receiving module 20 may further include: a receiving-side mixer 22, where the receiving-side mixer 22 mixes the filtered echo signal with the millimeter wave local oscillation signal generated by the millimeter wave broadband signal generating module 30, so as to implement down-conversion of the echo signal; and an image frequency signal suppression section 21, the image frequency signal suppression section 21 being configured to synthesize the I/Q signals obtained by mixing the echo signals, thereby obtaining an intermediate frequency signal.
As shown in fig. 1, as an example, the image frequency signal suppression section 21 synthesizes I/Q signals obtained by mixing echo signals by using a 90 ° bridge to obtain an intermediate frequency signal.
Furthermore, in the design of the millimeter wave three-dimensional imaging transceiving system, the in-band flatness is also considered, and the in-band flatness is divided into the in-band flatness of the receiving gain and the in-band flatness of the transmitting power. The working bandwidth of the millimeter wave processing device is 30-40GHz, and the in-band flatness of the millimeter wave processing device is designed by considering the frequency response characteristics of the internal passive devices (such as a frequency response curve of a mixer is shown in figure 3) and the negative slope of the microstrip circuit, namely, the in-band flatness of the receiving gain and the in-band flatness of the transmitting power are designed.
In the embodiment of the present invention, the transmitting module 10 preferably further includes a flatness adjusting section 13, and the transmit signal up-converted by the transmit side mixer 12 is input to the flatness adjusting section 13 to adjust the in-band flatness of the transmit power of the transmit signal of the transmitting module 10. Further preferably, the flatness adjusting unit 13 includes a positive slope amplifier 131 and an inter-stage adjustable equalizer 132, and the positive slope amplifier 131 and the inter-stage adjustable equalizer 132 perform in-band gain compensation and gain slope adjustment, respectively, so as to meet the requirement of in-band power flatness. Further, the reception module 20 preferably further includes a flatness adjustment unit 23, the flatness adjustment unit 23 is provided between the low noise amplifier 24 and the reception-side mixer 22, and the echo signal subjected to low noise matching via the low noise amplifier 24 is input to the flatness adjustment unit 23 to adjust the flatness in the reception gain band of the echo signal of the reception module 20. Further preferably, the flatness adjusting unit 23 includes a positive slope amplifier 231 and an inter-stage adjustable equalizer 232, and the positive slope amplifier 231 and the inter-stage adjustable equalizer 232 respectively perform compensation of in-band gain and adjustment of gain slope, thereby achieving the requirement of gain flatness. The frequency response curve of the positive slope amplifier is shown in fig. 4 and the frequency response curve of the equalizer is shown in fig. 5.
Echo signals and transmitting signals in the millimeter wave processing device are broadband millimeter wave Linear Frequency Modulation (LFM) signals, and the working instantaneous bandwidth is up to several GHz and even more than 10 GHz. Preferably, the operating bandwidth of the millimeter wave processing device of the invention is 30-40 GHz.
The millimeter wave scanning system 100 in the embodiment of the present invention is used for scanning an object to be scanned. As shown in fig. 1, millimeter wave scanning system 100 includes: the millimeter wave processing apparatus 1 of the present invention as described above; and a transmitting antenna 2 and a receiving antenna 3. The millimeter wave processing apparatus 1 radiates a millimeter wave transmission signal to an object to be scanned via the transmission antenna 2, and receives a millimeter wave echo signal reflected from the object to be scanned via the reception antenna 3.
According to the characteristics of an active millimeter wave human body security inspection system, the millimeter wave processing device and the millimeter wave scanning system which can meet real-time imaging are invented, have the characteristics of large instantaneous working bandwidth, low noise of a receiving channel and low stray of a transmitting signal, are suitable for batch production and meet civil requirements.
Those skilled in the art will readily appreciate that the above-described preferred embodiments may be freely combined, superimposed, without conflict. The above exemplary embodiments are merely illustrative of the principles of the present invention and are not intended to limit the scope of the invention. Various modifications may be made by those skilled in the art without departing from the spirit and principles of the disclosure without departing from the scope thereof, which is defined by the claims.
Claims (10)
1. A millimeter wave processing apparatus that processes a transmission signal transmitted to an object to be scanned and processes an echo signal reflected from the object to be scanned, wherein the millimeter wave processing apparatus comprises:
the millimeter wave signal generating module comprises a broadband millimeter wave frequency source and a filtering unit, wherein the filtering unit is used for filtering and matching a millimeter wave broadband signal generated by the broadband millimeter wave frequency source to form a millimeter wave local oscillation signal;
a transmit module, the transmit module comprising: an image frequency signal suppression section for converting a predetermined input signal into an I/Q signal; a transmitting side mixer for mixing the millimeter wave local oscillation signal with the I/Q signal to realize up-conversion of the predetermined input signal; and a filter for filtering signals having a frequency different from that of the signals subjected to the up-conversion processing to prevent crosstalk between the signals; and
a receiving module for processing the echo signal reflected from the object to be scanned.
2. The millimeter wave processing device according to claim 1, wherein the image frequency signal suppressing section converts the baseband signal into an I/Q signal using a 90 ° bridge.
3. The millimeter wave processing apparatus according to claim 1 or 2, wherein,
the receiving module further comprises a low noise amplifier, and the low noise amplifier performs low noise matching on the echo signal received by the millimeter wave processing device.
4. The millimeter wave processing apparatus of claim 3, wherein the low noise amplifier is designed using molybdenum copper slides and ground holes.
5. The millimeter wave processing apparatus according to claim 3 or 4, wherein the receiving module further comprises: the receiving side frequency mixer mixes the filtered echo signal with the millimeter wave local oscillation signal, so that the down-conversion of the echo signal is realized; and an image frequency signal suppression section that synthesizes I/Q signals formed by mixing the echo signals, thereby obtaining an intermediate frequency signal.
6. The millimeter wave processing apparatus of any of claims 1 to 5, wherein the transmitting module further comprises:
and the flatness adjusting part on the transmitting side inputs the transmitting signal up-converted by the frequency mixer on the transmitting side into the flatness adjusting part on the transmitting side so as to adjust the flatness in the transmitting power band of the transmitting signal of the transmitting module.
7. The millimeter wave processing apparatus of any of claims 3 to 5, wherein the receiving module further comprises:
and a flatness adjustment unit on the reception side, which is provided between the low noise amplifier and the reception side mixer, and to which the echo signal subjected to low noise matching via the low noise amplifier is input, so as to adjust flatness in a reception gain band of the echo signal of the reception block.
8. The millimeter wave processing apparatus according to claim 6 or 7,
the flatness adjustment sections of the transmission side and the reception side each include: a positive slope amplifier that performs in-band gain compensation on the signal; and an inter-stage adjustable equalizer, wherein the inter-stage adjustable equalizer adjusts the gain slope of the signal.
9. The millimeter wave processing apparatus according to any one of claims 1 to 8, wherein,
the working bandwidth of the millimeter wave processing device is 30-40 GHz.
10. A millimeter wave scanning system for scanning an object to be scanned, comprising:
the millimeter wave processing apparatus of any of claims 1 to 9; and
the millimeter wave processing device radiates a millimeter wave transmitting signal to an object to be scanned via the transmitting antenna, and receives a millimeter wave echo signal reflected from the object to be scanned via the receiving antenna.
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| CN201911349336.8A CN111157990A (en) | 2019-12-24 | 2019-12-24 | Millimeter wave processing device and millimeter wave scanning system |
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| CN201911349336.8A CN111157990A (en) | 2019-12-24 | 2019-12-24 | Millimeter wave processing device and millimeter wave scanning system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112098997A (en) * | 2020-09-18 | 2020-12-18 | 欧必翼太赫兹科技(北京)有限公司 | Three-dimensional holographic imaging security inspection radar image foreign matter detection method |
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| CN101866018A (en) * | 2010-05-27 | 2010-10-20 | 中国科学院上海微系统与信息技术研究所 | Radio frequency receiving and transmitting front end for millimeter wave holographic imaging security check system |
| CN204859174U (en) * | 2015-08-25 | 2015-12-09 | 武汉虹信通信技术有限责任公司 | 38GHzODU front -end design circuit |
| CN108562878A (en) * | 2018-03-29 | 2018-09-21 | 南京长峰航天电子科技有限公司 | A kind of radar signal simulator broadband frequency agility frequency measuring method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101866018A (en) * | 2010-05-27 | 2010-10-20 | 中国科学院上海微系统与信息技术研究所 | Radio frequency receiving and transmitting front end for millimeter wave holographic imaging security check system |
| CN204859174U (en) * | 2015-08-25 | 2015-12-09 | 武汉虹信通信技术有限责任公司 | 38GHzODU front -end design circuit |
| CN108562878A (en) * | 2018-03-29 | 2018-09-21 | 南京长峰航天电子科技有限公司 | A kind of radar signal simulator broadband frequency agility frequency measuring method |
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| CN112098997A (en) * | 2020-09-18 | 2020-12-18 | 欧必翼太赫兹科技(北京)有限公司 | Three-dimensional holographic imaging security inspection radar image foreign matter detection method |
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