CN215344503U - W-waveband broadband frequency agility device - Google Patents
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Abstract
The utility model discloses a W-band broadband frequency agility device, which comprises: the system comprises a time sequence control unit, a DDS unit, an LC filter, a mirror image rejection mixer, a filtering frequency multiplication amplifying unit and a receiving and transmitting integrated multifunctional chip which are sequentially connected; an S-band reference phase-locked source connected with the DDS unit; the C-band local oscillator phase-locked source is connected with the image rejection mixer; the filtering frequency multiplication amplifying unit is used for performing filtering processing and frequency multiplication amplifying processing on the mixing signal, generating a K-waveband frequency agile frequency signal and outputting the K-waveband frequency agile frequency signal; the receiving and transmitting integrated multifunctional chip is used for carrying out frequency doubling on the K wave band frequency agile frequency signals, generating W wave band broadband frequency agile frequency signals and outputting the W wave band broadband frequency agile frequency signals. The W-band frequency agile signal generated by the W-band broadband frequency agile device has the characteristics of large bandwidth, low stray, high phase noise, short wavelength and the like, and can effectively improve the imaging quality and resolution when applied to a security inspection imaging system.
Description
Technical Field
The utility model belongs to the technical field of electronics, and particularly relates to a W-band broadband frequency agility device.
Background
At present, with frequent public safety events, the human body security inspection imaging technology is greatly concerned and promoted. The millimeter wave imaging security inspection instrument becomes the mainstream development direction due to the characteristics of harmlessness to human bodies, high resolution and the like. The millimeter wave imaging technology is divided into an active type and a passive type. Compared with a passive imaging mode, the active millimeter wave security check instrument is high in resolution and strong in environmental adaptability, and therefore the active millimeter wave security check instrument receives more attention. The microwave part mainly comprises an antenna feeder component, a broadband transceiving channel and a broadband agile frequency source. The broadband frequency agility source provides Linear Frequency Modulation (LFM) signals for the active security inspection system, and the LFM signals serve as signal output and frequency conversion local oscillators of the security inspection system, and the quality of the spectral purity and the phase noise directly affect the imaging quality and the final security inspection effect.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a W-band broadband frequency agility device, which aims to solve the problem of low imaging resolution of a security inspection system in the prior art.
The embodiment of the utility model provides a W-band broadband frequency agility device, which comprises: the system comprises a time sequence control unit, a Direct Digital Synthesis (DDS), an LC filter, a mirror image rejection mixer, a filtering frequency multiplication amplifying unit, a receiving and transmitting integrated multifunctional chip, an S-band reference phase-locked source and a C-band local oscillator phase-locked source;
the time sequence control unit, the DDS unit, the LC filter, the image rejection mixer, the filtering frequency multiplication amplifying unit and the receiving and transmitting integrated multifunctional chip are connected in sequence; the S-band reference phase-locked source is connected with the DDS unit; the C-band local oscillation phase-locked source is connected with the image rejection mixer;
the time sequence control unit is used for generating and outputting a time sequence control signal;
the S-band reference phase-locked source is used for generating and outputting a reference signal;
the DDS unit is used for working according to the time sequence control signal, generating a linear frequency modulation LFM signal based on the reference signal and outputting the LFM signal;
the LC filter is used for filtering the LFM signal and outputting the LFM signal after filtering;
the C-band local oscillator phase-locked source is used for generating and outputting a local oscillator signal;
the image rejection mixer is used for mixing the LFM signal after filtering processing with the local oscillator signal to generate a mixed signal with sideband rejection;
the filtering frequency multiplication amplifying unit is used for performing filtering processing and frequency multiplication amplifying processing on the mixing signal to generate a K-waveband frequency agile signal and outputting the K-waveband frequency agile signal;
the receiving and transmitting integrated multifunctional chip is used for frequency doubling of the K wave band frequency agile frequency signals, generating W wave band broadband frequency agile frequency signals and outputting the W wave band broadband frequency agile frequency signals.
Compared with the prior art, the embodiment of the utility model has the following beneficial effects:
the W-band broadband frequency agility device provided by the embodiment of the utility model is provided with a power supply and time sequence control unit, a DDS unit, an LC filter, an image rejection mixer, a filtering frequency multiplication amplifying unit, a receiving and transmitting integrated multifunctional chip, an S-band reference phase-locked source and a C-band local oscillator phase-locked source. The power supply and time sequence control unit controls the DDS unit to generate an LFM signal based on a reference signal provided by the S-band reference phase-locked source, the image rejection frequency mixer mixes the LFM signal after filtering processing with a local oscillator signal generated by the C-band local oscillator phase-locked source to generate a frequency mixing signal with sideband rejection, the filtering frequency multiplication amplifying unit filters and multiplies the frequency of the frequency mixing signal to a K band, and the receiving and transmitting integrated multifunctional chip multiplies the frequency of the input K band signal and generates a W band broadband frequency agile signal. The W-band frequency agile signal generated by the W-band broadband frequency agile device in this embodiment has the characteristics of large bandwidth, low stray, high phase noise, short wavelength, and the like, and when applied to a security inspection imaging system, can effectively improve imaging quality and resolution.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a W-band broadband frequency agility device according to an embodiment of the present invention;
FIG. 2 is a spurious distribution curve of a signal generated by the DDS unit;
fig. 3 is a schematic structural diagram of a W-band broadband frequency agility device according to another embodiment of the present invention;
fig. 4 is a schematic structural diagram of a W-band broadband frequency agility device according to another embodiment of the present invention;
reference numerals:
101. a timing control unit; 102. a DDS unit; 103. an LC filter; 104. an image rejection mixer; 105. a filtering frequency multiplication amplifying unit; 106. an S-band reference phase-locked source; 107. a C-band local oscillator phase-locked source; 108. a 90 ° electrical bridge; 109. a clock reference unit; 110. receive and dispatch integrative multi-functional chip.
Detailed Description
In order to make the technical solution better understood by those skilled in the art, the technical solution in the embodiment of the present invention will be clearly described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is a part of the embodiment of the present invention, and not a whole embodiment. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present disclosure without any creative effort shall fall within the protection scope of the present disclosure.
The terms "include" and any other variations in the description and claims of this document and the above-described figures, mean "include but not limited to", and are intended to cover non-exclusive inclusions and not limited to the examples listed herein. Furthermore, the terms "first" and "second," etc. are used to distinguish between different objects and are not used to describe a particular order.
With the improvement of public safety requirements and the development of millimeter wave security check instruments, millimeter wave security check instruments are widely applied to stations, airports, stadiums, scenic spots and the like. The broadband agile frequency source is an important component of the millimeter wave detector and is also a key factor influencing the imaging effect. The synthesis mode is divided, and the agile frequency source is divided into a phase-locked mode and a direct digital synthesis mode. The phase-locked frequency synthesis technology has long frequency hopping time and is difficult to meet the system requirements. While the direct digital synthesis approach can provide frequency hopping times on the order of nanometers as well as frequency resolution on the order of Hz. However, the output frequency is low in upper limit, the in-band spurious is large, the band can not be filtered by a filter, and the effective bandwidth meeting the requirement can be obtained only by multiple times of frequency multiplication. Most of the security check instrument products on the market are applied to the Ka waveband, a large number of radio frequency switches, low-noise amplifiers and the like are needed in a rear-stage link of a system, the system is complex in structure, and the use cost is greatly increased. The W-band broadband frequency agility device disclosed by the utility model outputs the LFM signal of the W band, is mainly applied to a security inspection imaging system, and has higher imaging resolution compared with a security inspection imaging system adopting a Ka band.
The following detailed description of implementations of the utility model refers to the accompanying drawings in which:
fig. 1 is a schematic structural diagram of a W-band broadband agility device according to an embodiment of the present invention, where the W-band broadband agility device includes: the device comprises a time sequence control unit (101), a DDS unit (102), an LC filter (103), an image rejection mixer (104), a filtering frequency multiplication amplifying unit (105), an S-band reference phase-locked source (106), a C-band local oscillation phase-locked source (107) and a receiving and transmitting integrated multifunctional chip (110).
The device comprises a time sequence control unit (101), a DDS unit (102), an LC filter (103), an image rejection mixer (104), a filtering frequency multiplication amplifying unit (105) and a receiving and transmitting integrated multifunctional chip (110), wherein the time sequence control unit, the DDS unit (102), the LC filter (103), the image rejection mixer, the filtering frequency multiplication amplifying unit and the receiving and transmitting integrated multifunctional chip are sequentially connected; an S-band reference phase-locked source (106) connected to the DDS unit (102); and the C-band local oscillation phase-locked source (107) is connected with the image rejection mixer (105).
And the timing control unit (101) is used for generating and outputting the timing control signal. The timing control signal is used to control the operating state of the DDS unit (102).
And the S-band reference phase locked source is used for generating and outputting a reference signal.
And a DDS unit (102) for operating according to the timing control signal, generating the LFM signal based on the reference signal, and outputting the LFM signal.
Wherein the reference signal is a DDS reference clock signal. Optionally, the frequency of the DDS reference clock signal is 3.5 GHz.
And an LC filter (103) for performing filtering processing on the LFM signal and outputting the LFM signal after the filtering processing.
And the C-band local oscillation phase locking source (107) is used for generating and outputting a local oscillation signal. And the image rejection mixer (104) is used for mixing the LFM signal after the filtering processing with the local oscillator signal to generate a mixed signal with sideband rejection.
And the filtering frequency multiplication amplifying unit (105) is used for carrying out filtering processing and frequency multiplication amplifying processing on the mixing frequency signal, generating a K-waveband frequency agile signal and outputting the K-waveband frequency agile signal.
And the receiving and transmitting integrated multifunctional chip (110) is used for frequency doubling the input K wave band frequency agile frequency signals, generating W wave band broadband frequency agile frequency signals and outputting the W wave band broadband frequency agile frequency signals.
In some embodiments, the filtering frequency multiplication amplifying unit (105) includes: the filter and the frequency multiplication amplifying module.
And a filter connected to the image rejection mixer (104) for filtering the mixed signal and outputting the filtered mixed signal.
And the frequency doubling amplification module is connected with the filter and used for performing frequency doubling amplification processing on the filtered mixing signal to generate a K-waveband frequency agile signal.
Optionally, the filter in the filtering frequency doubling amplification unit (109) is designed by a microstrip line, so that the performance index of the W-band broadband frequency agility device is met, and compared with a cavity or other filters, the size of the W-band broadband frequency agility device is reduced, and the research and development cost is reduced.
In the embodiment, the signals generated by the DDS unit (102) are two paths of I/Q signals with a phase difference of 90 degrees, and on the basis, when the image rejection mixer (104) mixes the LFM signals subjected to filtering processing with the local oscillator signals generated by the C-band local oscillator phase-locked source (107), the two paths of I/Q signals with a phase difference of 90 degrees and the local oscillator signals are mixed.
In some embodiments, the LFM signal generated by the DDS unit (102) has a frequency of 550MHz to 862.5 MHz. For example, fig. 2 is a stray distribution curve of the output signal of the DDS unit, it can be seen from the graph that the stray amplitude of the signal is less than-60 dBc in the operating frequency range, and therefore, a signal source which meets the use bandwidth and has a low stray amplitude is provided for the W-band broadband frequency agile device, thereby improving the imaging quality.
Optionally, the frequency of the LFM signal generated by the DDS unit (102) is 580MHz to 630MHz, 650MHz to 750MHz, 770MHz to 810 MHz.
The W-band broadband frequency agility device provided by the embodiment of the utility model is provided with a time sequence control unit (101), a DDS unit (102), an LC filter (103), an image rejection mixer (104), a filtering frequency multiplication amplifying unit (105), an S-band reference phase-locked source (106), a C-band local oscillation phase-locked source (107) and a receiving and transmitting integrated multifunctional chip (110). The timing control unit (101) controls the DDS unit (102) to generate an LFM signal based on a reference signal provided by an S-band reference phase-locked source (106), the image rejection mixer (104) mixes the LFM signal after filtering processing with a local oscillator signal generated by a C-band local oscillator phase-locked source (107) to generate a mixed signal with sideband rejection, the filtering frequency multiplication amplifying unit (105) filters and multiplies the frequency of the mixed signal to a K band, and the receiving and transmitting integrated multifunctional chip (110) multiplies the frequency of the input K band signal and generates a W-band broadband frequency agile signal. The W-band frequency agile signal generated by the W-band broadband frequency agile device in this embodiment has the characteristics of large bandwidth, low stray, high phase noise, short wavelength, and the like, and when applied to a security inspection imaging system, can effectively improve imaging quality and resolution.
Fig. 3 is a schematic structural diagram of a W-band broadband agility device according to an embodiment of the present invention, where the W-band broadband agility device includes: the device comprises a time sequence control unit (101), a DDS unit (102), an LC filter (103), an image rejection mixer (104), a filtering frequency multiplication amplifying unit (105), an S-band reference phase-locked source (106), a C-band local oscillation phase-locked source (107), a 90-degree electric bridge (108) and a receiving-transmitting integrated multifunctional chip (110). For convenience of explanation, only the portions different from the above-described embodiments will be explained.
In this embodiment, the signal generated by the DDS unit (102) is an LFM signal. And a 90 DEG bridge (108) which is provided between the LC filter (103) and the image rejection mixer (104) and divides the LFM signal subjected to the filtering process into I/Q signals having a phase difference of 90 deg.
And the image rejection mixer (105) is used for mixing the I/Q signal with the phase difference of 90 degrees with the local oscillator signal generated by the C-band local oscillator phase-locked source (107) to generate a mixed signal with sideband rejection, and mixing to generate the mixed signal, so that lower sideband spurious is effectively rejected, the pressure of a post-stage filter is reduced, and the signal-to-noise ratio of a transmitting signal is improved.
In some embodiments, the LFM signal generated by the DDS unit (102) has a frequency of 550MHz to 862.5 MHz. Fig. 2 is a stray distribution curve of a signal generated by the DDS unit, and it can be seen from the graph that the operating frequency range is a low stray frequency range of the signal, which provides a low stray signal source for the W-band broadband frequency agile device and improves the imaging quality.
Optionally, the frequency of the LFM signal generated by the DDS unit (102) is 580MHz to 630MHz, 650MHz to 750MHz, 770MHz to 810 MHz.
In the embodiment, the DDS unit (102) generates a signal with high spurious suppression, the lower sideband spurious is effectively suppressed through the combination of the 90-degree electric bridge (108) and the image suppression mixer (105), the pressure of a post-stage filter is reduced, and the signal-to-noise ratio of a transmitting signal is improved.
The W-band broadband frequency agility device provided by the embodiment comprises a time sequence control unit (101), a DDS unit (102), an LC filter (103), an image rejection mixer (104), a filtering frequency multiplication amplifying unit (105), an S-band reference phase-locked source (106), a C-band local oscillation phase-locked source (107), a 90-degree electric bridge (108) and a transceiving integrated multifunctional chip (110). The timing control unit (101) controls a DDS unit (102) to generate an LFM signal based on a reference signal provided by an S-band reference phase-locked source (106), a 90-degree electric bridge (108) divides the LFM signal filtered by an LC filter (103) into I/Q signals with a phase difference of 90 degrees, an image rejection mixer (104) mixes the I/Q signals with a local oscillator signal generated by a C-band local oscillator phase-locked source (107) to generate a mixed signal with sideband rejection, a filtering frequency multiplication amplifying unit (105) filters and frequency multiplication amplifies the mixed signal to obtain a K-band frequency-division converted signal, and a receiving and transmitting integrated multifunctional chip (110) multiplies the frequency of the K-band frequency-division converted signal to a W-band. The lower sideband spurs are effectively restrained by the combination of the 90-degree electric bridge (108) and the image restraining mixer (105), the pressure of a post-stage filter is reduced, the signal-to-noise ratio of a transmitting signal is improved, a broadband W-waveband broadband frequency agile signal generated by the W-waveband broadband frequency agile device has the characteristics of large bandwidth, low spurs, high phase noise, short wavelength and the like, and the imaging quality and the resolution can be effectively improved when the W-waveband broadband frequency agile signal is applied to a security inspection imaging system.
In some embodiments, based on the foregoing embodiments, the W-band wideband frequency agility apparatus further includes: a clock reference unit (109).
Fig. 4 is a schematic structural diagram of a W-band wideband frequency agility apparatus according to another embodiment of the present invention, where the W-band wideband frequency agility apparatus includes: the device comprises a time sequence control unit (101), a DDS unit (102), an LC filter (103), an image rejection mixer (104), a filtering frequency multiplication amplifying unit (105), an S-band reference phase-locked source (106), a C-band local oscillation phase-locked source (107), a 90-degree electric bridge (108), a clock reference unit (109) and a transceiving integrated multifunctional chip (110). For convenience of explanation, a portion different from the above-described embodiment will be explained.
The W-band wideband frequency agility device shown in fig. 4 is based on the W-band wideband frequency agility device shown in fig. 3 with a clock reference unit (109). In some embodiments, a W-band wideband frequency agility device comprises: the device comprises a time sequence control unit (101), a DDS unit (102), an LC filter (103), an image rejection mixer (104), a filtering frequency multiplication amplifying unit (105), an S-band reference phase-locked source (106), a C-band local oscillation phase-locked source (107), a clock reference unit (109) and a receiving-transmitting integrated multifunctional chip (110). For convenience of explanation, only the portions different from the above-described embodiments will be explained.
The clock reference unit (109) is respectively connected with the timing control unit (101), the S-band reference phase-locked source (106) and the C-band local oscillation phase-locked source (107), and is used for generating and outputting three paths of clock signals, so that the reference clock signals are provided for the timing control unit (101), the S-band reference phase-locked source (106) and the C-band local oscillation phase-locked source (107), and the coherence of the whole W-band broadband frequency agile device is ensured.
And the timing control unit (101) generates and outputs a timing control signal based on one path of clock signal generated by the clock reference unit (109).
And the S-band reference phase-locked source (106) generates and outputs a reference signal based on one path of clock signals generated by the clock reference unit (109).
And the C-band local oscillation phase-locked source (107) generates and outputs a local oscillation signal based on one path of clock signal generated by the clock reference unit (109).
Optionally, the clock reference unit (109) is a constant temperature crystal oscillator unit.
In some embodiments, the frequency of the reference clock signal provided by the clock reference unit (108) is 40 MHz.
The W-band broadband frequency agility device provided by the embodiment comprises a time sequence control unit (101), a DDS unit (102), an LC filter (103), an image rejection mixer (104), a filtering frequency multiplication amplifying unit (105), an S-band reference phase-locked source (106), a C-band local oscillation phase-locked source (107), a 90-degree electric bridge (108), a clock reference unit (109) and a transceiving integrated multifunctional chip (110). The clock reference unit (109) provides reference clock signals for the time sequence control unit (101), the S-band reference phase-locked source (106) and the C-band local oscillation phase-locked source (107) respectively, and accordingly phase coherence of the system is guaranteed. The timing control unit (101) controls a DDS unit (102) to generate an LFM signal based on a reference signal provided by an S-band reference phase-locked source (106), a 90-degree electric bridge (108) divides the LFM signal filtered by an LC filter (103) into I/Q signals with a phase difference of 90 degrees, an image rejection mixer (104) mixes the I/Q signals with a local oscillator signal generated by a C-band local oscillator phase-locked source (107) to generate a mixed signal with sideband rejection, a filtering frequency multiplication amplifying unit (105) filters and frequency multiplication amplifies the mixed signal to obtain a K-band frequency-division converted signal, and a receiving and transmitting integrated multifunctional chip (110) multiplies the frequency of the K-band frequency-division converted signal to a W-band. The lower sideband spurs are effectively restrained by the combination of the 90-degree electric bridge (108) and the image restraining mixer (105), the pressure of a post-stage filter is reduced, the signal-to-noise ratio of a transmitting signal is improved, a broadband W-waveband broadband frequency agile signal generated by the W-waveband broadband frequency agile device has the characteristics of large bandwidth, low spurs, high phase noise, short wavelength and the like, and the imaging quality and the resolution can be effectively improved when the W-waveband broadband frequency agile signal is applied to a security inspection imaging system.
On the basis of any one of the previous embodiments, the transceiver-integrated multifunctional chip (110) comprises: the frequency-doubling amplifying switch module and the frequency-mixing receiving module.
And the frequency doubling amplification switch module is connected with the filtering frequency doubling amplification unit (105) and is used for carrying out secondary frequency doubling amplification on the K wave band frequency agile frequency signals, generating W wave band broadband frequency agile frequency signals and outputting the W wave band broadband frequency agile frequency signals. And the frequency doubling amplification switch module is also used for controlling the working state of the security inspection system when the W-band broadband frequency agile device is used for the security inspection system.
Optionally, the amplification factor of the frequency doubling amplification switch module is equal to the amplification factor of the frequency doubling amplification module in the filtering frequency doubling amplification unit (105). Optionally, the frequency doubling amplification module is a 4 frequency doubling amplification unit, and the frequency doubling amplification switch module is a 4 frequency doubling amplification unit.
And the frequency mixing receiving module is used for connecting the W-band broadband frequency agility device with the security inspection system data processing module when the W-band broadband frequency agility device is used for a security inspection system, receiving the intermediate frequency signal, and processing the intermediate frequency signal to finish imaging display. The intermediate frequency signal is obtained by mixing the echo by an internal amplification mixing link.
In this embodiment, the W-band broadband frequency agility device adopts a multifunctional chip integrating functions of frequency multiplication, switching, frequency mixing and the like, so that the complexity and design difficulty of a link are greatly simplified, and the hardware cost is reduced. And the frequency doubling amplification module is used for carrying out frequency doubling amplification on the K-waveband frequency agile frequency signals obtained by filtering and frequency doubling amplification processing to finally obtain W-waveband broadband frequency agile frequency signals. The wavelength of the W-band signal is shorter, and the image resolution can be improved by more than one time in theory compared with that of a K-band imaging system.
Compared with other schemes, the W-band broadband frequency agility device comprises a filtering frequency doubling amplification unit (105) and a receiving-transmitting integrated multifunctional chip (110), wherein the two-stage frequency doubling is performed for 16 times, the frequency doubling times in a radio frequency link are not increased while the transmitting frequency is improved, namely the phase noise of a transmitting signal is not further deteriorated compared with the stray; and before the filtering frequency multiplication amplifying unit (105), the LFM signal after filtering processing and the local oscillation signal generated by the C-band local oscillation phase locking source (107) are subjected to frequency mixing through the image rejection frequency mixer (104) to generate a frequency mixing signal with sideband rejection, so that the signal-to-noise ratio of a transmitting signal is improved, and when the W-band broadband frequency agile device is applied to a security inspection imaging system, the imaging quality and the resolution can be effectively improved.
The embodiment of the utility model also discloses a security inspection system which comprises the W-band broadband frequency agile device provided by any one of the embodiments.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. A W-band broadband frequency agility device, comprising: the system comprises a time sequence control unit, a direct digital frequency synthesis (DDS) unit, an LC filter, a mirror image rejection mixer, a filtering frequency multiplication amplifying unit, a receiving and transmitting integrated multifunctional chip, an S-band reference phase-locked source and a C-band local oscillator phase-locked source;
the time sequence control unit, the DDS unit, the LC filter, the image rejection mixer, the filtering frequency multiplication amplifying unit and the receiving and transmitting integrated multifunctional chip are connected in sequence; the S-band reference phase-locked source is connected with the DDS unit; the C-band local oscillation phase-locked source is connected with the image rejection mixer;
the time sequence control unit is used for generating and outputting a time sequence control signal;
the S-band reference phase-locked source is used for generating and outputting a reference signal;
the DDS unit is used for working according to the time sequence control signal, generating a linear frequency modulation LFM signal based on the reference signal and outputting the LFM signal;
the LC filter is used for filtering the LFM signal and outputting the LFM signal after filtering;
the C-band local oscillator phase-locked source is used for generating and outputting a local oscillator signal;
the image rejection mixer is used for mixing the LFM signal after filtering processing with the local oscillator signal to generate a mixed signal with sideband rejection;
the filtering frequency multiplication amplifying unit is used for performing filtering processing and frequency multiplication amplifying processing on the mixing signal to generate a K-waveband frequency agile signal and outputting the K-waveband frequency agile signal;
the receiving and transmitting integrated multifunctional chip is used for frequency doubling of the K wave band frequency agile frequency signals, generating W wave band broadband frequency agile frequency signals and outputting the W wave band broadband frequency agile frequency signals.
2. The W-band wideband frequency agility device according to claim 1 wherein the frequency of the LFM signal generated by the DDS unit is 550 MHz-862.5 MHz.
3. The W-band wideband frequency agility device according to claim 1, wherein the W-band wideband frequency agility device further comprises: a 90 ° electrical bridge;
the 90-degree electric bridge is arranged between the LC filter and the image rejection mixer and is used for dividing the LFM signals after filtering processing into I/Q signals with the phase difference of 90 degrees;
the image rejection mixer is used for mixing the I/Q signal with the local oscillator signal to generate a mixed signal with sideband rejection and outputting the mixed signal.
4. The W-band wideband frequency agility device according to claim 3, wherein the filtering frequency doubling amplification unit comprises: the filter and the frequency multiplication amplifying module;
the filter is connected with the image rejection mixer and used for filtering the mixed signal and outputting the filtered mixed signal;
and the frequency doubling amplification module is connected with the filter and used for performing frequency doubling amplification processing on the filtered mixing signal to generate a K-waveband frequency agile signal.
5. The W-band broadband agility device according to claim 4 wherein the filter is a microstrip filter.
6. The W-band broadband agility device according to any one of claims 1 to 5, wherein the W-band broadband agility device further comprises: a clock reference unit;
the clock reference unit is respectively connected with the time sequence control unit, the S-band reference phase-locked source and the C-band local oscillator phase-locked source, and is used for providing reference clock signals for the time sequence control unit, the S-band reference phase-locked source and the C-band local oscillator phase-locked source.
7. The W-band wideband frequency agility device according to claim 6 wherein the frequency of the reference clock signal is 40 MHz.
8. The W-band broadband agility device according to claim 1, wherein the transceiver integrated multifunctional chip comprises: the frequency multiplication amplifying switch module and the frequency mixing receiving module;
the frequency doubling amplification switch module is connected with the filtering frequency doubling amplification unit and is used for carrying out secondary frequency doubling amplification on the K wave band frequency agile frequency signals to generate W wave band broadband frequency agile frequency signals and outputting the W wave band broadband frequency agile frequency signals;
and the frequency mixing receiving module is used for receiving the intermediate frequency signal after the echo frequency mixing and processing the intermediate frequency signal.
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| CN (1) | CN215344503U (en) |
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2021
- 2021-05-10 CN CN202120988350.9U patent/CN215344503U/en active Active
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