CN210075198U - Ka frequency band broadband linear frequency sweep source - Google Patents
Ka frequency band broadband linear frequency sweep source Download PDFInfo
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- CN210075198U CN210075198U CN201921015106.3U CN201921015106U CN210075198U CN 210075198 U CN210075198 U CN 210075198U CN 201921015106 U CN201921015106 U CN 201921015106U CN 210075198 U CN210075198 U CN 210075198U
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Abstract
The utility model discloses a Ka frequency range broadband linear sweep frequency source, which comprises a frequency synthesis unit, a power divider, a drive amplifier A, a drive amplifier B, a digital synthesis unit, a frequency mixer, a signal conditioning unit and a frequency doubling output unit; the utility model discloses a signal output is realized to FPGA digital synthesis + mixing + doubling of frequency mode, has the advantage that output signal phase noise is good, the clutter suppression is high for in step-by-step radar transmitter of broadband, radar receiver local oscillator signal, millimeter wave imaging system, frequency signal bandwidth and resolution ratio can greatly improve.
Description
Technical Field
The utility model belongs to the technical field of the frequency synthesis source, especially, relate to a linear sweep frequency source of Ka frequency channel broadband.
Background
The broadband linear frequency sweeping source is the core of modern electronic equipment such as radio frequency, communication and the like, is a basic component of all microwave systems (such as radar, communication, navigation and the like), and is concerned more and more with the development of electronic technologies such as radio frequency communication and the like.
At present, the Ka frequency band broadband linear frequency sweeping source is mainly realized by adopting a DDS + PLL or a digital baseband + quadrature modulation mode, and because the digital baseband or the DDS is limited by the frequency of a system reference clock, the frequency broadband of an output signal is narrower and the clutter suppression is poorer.
SUMMERY OF THE UTILITY MODEL
The present invention aims to solve the above problems and provide a Ka band wideband linear frequency sweeping source, which comprises a frequency synthesizing unit, a power divider, a driving amplifier a, a driving amplifier B, a digital synthesizing unit, a mixer, a signal conditioning unit and a frequency doubling output unit; the output end of the frequency synthesizer is connected with the input end of the power divider; the output end of the power divider is connected with the input end of the digital synthesis unit through a drive amplifier A; the output end of the digital synthesis unit is connected with the first input end of the frequency mixer; the output end of the power divider is connected with the second input end of the frequency mixer through a driving amplifier B; and the output end of the frequency mixer, the signal conditioning unit and the frequency doubling output unit are sequentially connected.
The beneficial effects of the utility model reside in that: the utility model discloses a signal output is realized to FPGA digital synthesis + mixing + doubling of frequency mode, has the advantage that output signal phase noise is good, the clutter suppression is high for in step-by-step radar transmitter of broadband, radar receiver local oscillator signal, millimeter wave imaging system, frequency signal bandwidth and resolution ratio can greatly improve.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention;
fig. 2 is a schematic diagram of an embodiment of the present invention;
fig. 3 is a schematic view of the working principle of the present invention.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings:
as shown in fig. 1, the utility model relates to a Ka frequency band broadband linear sweep frequency source, which comprises a frequency synthesis unit, a power divider, a driving amplifier a, a driving amplifier B, a digital synthesis unit, a mixer, a signal conditioning unit and a frequency doubling output unit; the output end of the frequency synthesizer is connected with the input end of the power divider; the output end of the power divider is connected with the input end of the digital synthesis unit through a drive amplifier A; the output end of the digital synthesis unit is connected with the first input end of the frequency mixer; the output end of the power divider is connected with the second input end of the frequency mixer through a driving amplifier B; and the output end of the frequency mixer, the signal conditioning unit and the frequency doubling output unit are sequentially connected.
Further, the frequency synthesis unit comprises a frequency synthesizer, a control unit and a crystal oscillator; the input end of the frequency synthesizer is connected with the output end of the crystal oscillator; the enabling input end of the frequency synthesizer is connected with the output end of the control unit; and the output end of the frequency synthesizer is connected with the input end of the power divider.
Further, the digital synthesis unit comprises an FPGA module, a height DA and a low-pass filter; the FPGA module is connected with the high-speed DA; the output end of the drive amplifier A is connected with the high-speed DA input end; and the high-speed DA output end is connected with the frequency mixer through the low-pass filter.
Further, the signal conditioning unit comprises a band-pass filter A, a radio frequency amplifier and a band-pass filter B; the frequency mixer, the band-pass filter A, the radio frequency amplifier, the band-pass filter B and the frequency multiplier are connected in sequence.
Further, the frequency multiplication output unit comprises a frequency multiplier and a band-pass filter C; and the output end of the signal conditioning unit is connected with the input end of the band-pass filter C through a frequency doubling output unit.
The utility model discloses can realize: output of linear sweep signal frequency: 32 GHz-40 GHz; the frequency modulation nonlinear error of the broadband frequency modulation signal is less than or equal to 0.1 percent; the output amplitude is greater than or equal to 10 dBm; spurious suppression is greater than or equal to 45 dBc; the waveform parameters are configurable.
As shown in fig. 3, the working principle of the present invention is schematically illustrated, the output signal of the broadband linear frequency sweeping source is divided into two paths, one path of signal is used as the excitation signal of the Ka band radar transmitter, and is amplified by the transmitter and then transmitted through the antenna; and the other path of signal is used as a receiver local oscillation signal of the orthogonal mixer, orthogonal mixing is carried out on the receiver local oscillation signal and a detection target echo signal which is a receiver radio frequency signal, and IQ signals are sampled, so that detected target information is obtained.
The utility model discloses a signal output is realized to FPGA digital synthesis + mixing + doubling of frequency mode, has the advantage that output signal phase noise is good, the clutter suppression is high for in step-by-step radar transmitter of broadband, radar receiver local oscillator signal, millimeter wave imaging system, frequency signal bandwidth and resolution ratio can greatly improve.
The technical scheme of the utility model is not limited to the restriction of above-mentioned specific embodiment, all according to the utility model discloses a technical scheme makes technical deformation, all falls into within the protection scope of the utility model.
Claims (5)
1. A Ka frequency band broadband linear sweep frequency source is characterized by comprising a frequency synthesis unit, a power divider, a driving amplifier A, a driving amplifier B, a digital synthesis unit, a frequency mixer, a signal conditioning unit and a frequency multiplication output unit; the output end of the frequency synthesizer is connected with the input end of the power divider; the output end of the power divider is connected with the input end of the digital synthesis unit through a drive amplifier A; the output end of the digital synthesis unit is connected with the first input end of the frequency mixer; the output end of the power divider is connected with the second input end of the frequency mixer through a driving amplifier B; and the output end of the frequency mixer, the signal conditioning unit and the frequency doubling output unit are sequentially connected.
2. The Ka-band broadband linear sweep source of claim 1, wherein the frequency synthesis unit comprises a frequency synthesizer, a control unit and a crystal oscillator; the input end of the frequency synthesizer is connected with the output end of the crystal oscillator; the enabling input end of the frequency synthesizer is connected with the output end of the control unit; and the output end of the frequency synthesizer is connected with the input end of the power divider.
3. The Ka-band broadband linear sweep source of claim 1, wherein the digital synthesis unit comprises an FPGA module, an altitude DA, a low pass filter; the FPGA module is connected with the high-speed DA; the output end of the drive amplifier A is connected with the high-speed DA input end; and the high-speed DA output end is connected with the frequency mixer through the low-pass filter.
4. The Ka-band broadband linear sweep source of claim 1, wherein the signal conditioning unit comprises a band-pass filter A, a radio frequency amplifier, a band-pass filter B; the frequency mixer, the band-pass filter A, the radio frequency amplifier, the band-pass filter B and the frequency multiplier are connected in sequence.
5. The Ka-band broadband linear sweep source of claim 1, wherein the frequency doubling output unit comprises a frequency multiplier and a band-pass filter C; and the output end of the signal conditioning unit is connected with the input end of the band-pass filter C through a frequency doubling output unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921015106.3U CN210075198U (en) | 2019-07-02 | 2019-07-02 | Ka frequency band broadband linear frequency sweep source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921015106.3U CN210075198U (en) | 2019-07-02 | 2019-07-02 | Ka frequency band broadband linear frequency sweep source |
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| Publication Number | Publication Date |
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| CN210075198U true CN210075198U (en) | 2020-02-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921015106.3U Active CN210075198U (en) | 2019-07-02 | 2019-07-02 | Ka frequency band broadband linear frequency sweep source |
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| CN (1) | CN210075198U (en) |
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2019
- 2019-07-02 CN CN201921015106.3U patent/CN210075198U/en active Active
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