CN105974374A - Frequency synthesizer for generating Ka-waveband FM linear continuous wave and operating method thereof - Google Patents
Frequency synthesizer for generating Ka-waveband FM linear continuous wave and operating method thereof Download PDFInfo
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- 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
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Abstract
The invention discloses a frequency synthesizer for generating a Ka-waveband FM linear continuous wave and an operating method thereof, wherein a millimeter wave FMCWSAR echo receiving system of the frequency synthesizer is adopted. The frequency synthesizer comprises the components of a crystal oscillator, a direct digital frequency synthesizing unit, a PDRO, a first power divider, a second power divider, a first-stage up conversion unit, a second-stage up conversion unit and a frequency multiplication unit. The crystal oscillator is connected with the first power divider. The output end of the first power divider is connected with the input end of the direct digital frequency synthesizing unit and the input end of the PDRO. The output end of the PDRO is connected with the input end of the second power divider. The output end of the second power divider is connected with the input end of the frequency multiplication unit and the input end of the first-stage up conversion unit. The output end of the frequency multiplication unit is connected with the input end of the second-stage up conversion unit. The output end of the direct digital frequency synthesizing unit is connected with the input end of the first-stage up conversion unit. The output end of the first-stage up conversion unit is connected with the input end of the second-stage up conversion unit.
Description
Technical field
The present invention relates to UAV system millimeter wave FMCWSAR, particularly to producing Ka wave band FM linear continuous wave signal
Frequency synthesizer and method of work, use the milli of the frequency synthesizer of described generation Ka wave band FM linear continuous wave signal
Metric wave FMCWSAR echo reception system.
Background technology
Due to system, pulse regime SAR system equipment complexity, Heavy Weight, volume are big, involve great expense, and are not suitable for
It is installed on SUAV.Continuous Wave with frequency modulation SAR(FMCWSAR) special system determines and need not use bigger transmitting
Peak power, system equipment is simple, uses de-tuned mode to receive echo-signal so that data processing amount greatly drops simultaneously
Low, reduce further complexity and the power consumption levels of system.But the non-linear meeting of frequency sweep of Continuous Wave with frequency modulation SAR signal is to imaging
Dimension resolution causes and has a strong impact on.
Under de-tuned reception pattern, Continuous Wave with frequency modulation frequency sweep nonlinear problem makes the backward energy of same target very
Internal diffusion on a large scale, thus directly contribute the decline of distance dimension resolution, and, target range is the most remote, the time of signal echo
Postponing the biggest, the non-linear impact caused is the biggest.In signals transmission, the non-ideal characteristic due to device also can introduce
Frequency non-linear error, also result in target range compression after main lobe broadening, sidelobe level raise, even cause secondary lobe to produce
Asymmetrical distortion.Therefore those skilled in the art need to improve the linear of Continuous Wave with frequency modulation.
Prior art use VCO technology produce Continuous Wave with frequency modulation.Application No. CN201510632296.3,
The Chinese patent application of CN201410238478.8 provides utilize VCO technology produce Continuous Wave with frequency modulation method, but line
Property degree is bad.Application No. CN201020697829.9, CN201510632296.3, CN201310038806.5,
The method providing the raising Continuous Wave with frequency modulation linearity in the Chinese patent application of CN201410740245.8, but these methods
It is all that efficiency is not in systems by carrying out closed-loop corrected process to non-linear after processing the rough estimate of frequency sweep nonlinearity erron
Enough height.
Summary of the invention
The problem that the present invention solves is in prior art, and the linearity of Continuous Wave with frequency modulation SAR signal is low；Ask described in solving
Topic, the present invention provides a kind of frequency synthesizer producing Ka wave band FM linear continuous wave signal and method of work thereof, uses institute
State the millimeter wave FMCWSAR echo reception system of the frequency synthesizer producing Ka wave band FM linear continuous wave signal.
The frequency synthesizer of generation Ka wave band FM linear continuous wave signal provided by the present invention includes: crystal oscillator, directly
Digital Frequency Synthesize unit, PDRO, the first merit are divided, the second merit is divided, first order upconverting unit, second level upconverting unit, times
Frequently unit；Described crystal oscillator and the first merit divide input to connect, and the outfan that described first merit is divided connects direct digital synthesis technique
The input of unit, the input of PDRO, the input that the outfan of PDRO and the second merit are divided connects, the outfan that the second merit is divided
Connecting input and the input of first order upconverting unit of multiplier unit, the outfan of multiplier unit connects change on the second level
Frequently the input of unit, the input of the outfan connection first order upconverting unit of direct digital synthesis technique unit, first
The outfan of level upconverting unit connects the input of second level upconverting unit.
Further, the steady frequency stability of the length of described crystal oscillator is 510-8/ s, short steady frequency stability is 810-10/ s, brilliant
The phase noise shaken: be not more than-132.3dBc/Hz@100Hz, is not more than-152.3dBc/Hz@1kHz；The rated voltage of crystal oscillator
For 5V.
Further, described direct digital synthesis technique unit uses AD9914 model, and internal clock speed is 3.5GSPS,
Frequency tuning resolution is 190pHz, uses 32 bit parallel data path interfaces, and broadband clutter recognition is not less than 55dBc, power supply
Employing+1.8V/3.3V.
Further, described direct digital synthesis technique unit produces linear FM signal, in described linear FM signal
Frequency of heart is 1250MHz, carries a width of 300MHz.
The present invention provides the work side of the frequency synthesizer of described generation Ka band broadband frequency modulation alignment consistency ripple signal
Method, including: step one, crystal oscillator output signal are after the first merit is divided, and a road is as the clock of direct digital synthesis technique unit, separately
An outer road is as the clock of PDRO；Step 2, Direct Digital Frequency Synthesizers produce linear FM signal；Step 3, described line
Property the point-frequency signal that produces of FM signal and PDRO carry out first order up-conversion；Step 4, first order up-conversion signal and PDRO
4 frequency-doubled signals of the signal produced carry out second level up-conversion, and the second level up-conversion signal of formation is Ka band signal.
The present invention also provides for using the milli of the frequency synthesizer of described generation Ka band broadband frequency modulation alignment consistency ripple signal
Metric wave FMCWSAR echo reception system, described millimeter wave FMCWSAR echo reception system is with described frequency synthesizer as signal
Source.
The beneficial effect comprise that
The present invention uses the way that high stability crystal oscillator, direct digital synthesis technique and two-stage up-conversion combine, and passes through Direct Digital
Frequency synthesis unit produces the signal quality big wideband correlation of comparatively ideal 300MHz, and uses in point-frequency signal generation
Circuit realiration frequency multiplication is to the mode of Ka wave band, it is to avoid the non-linear penalties of the linear FM signal brought in frequency multiplication link, real
The generation and the full coherent reception that have showed Ka wave band high linearity broadband Continuous Wave with frequency modulation signal process.Have and design simple, realization
Readily advantage.
The linearity of linear FM signal can produce impact to SAR imaging, and the linearity is excessive, can make signal main lobe after compression
Highly decline, negative lobe height raises, main lobe width broadening, causes range imaging to obscure, and resolution declines, and affects frequency modulation continuous
The precision of ripple SAR range imaging.The Ka wave band Continuous Wave with frequency modulation signal 300MHz bandwidth range internal linear of this receiver output
Degree is not more than 3 ‰.In conjunction with the gamma correction in data acquisition process unit, it is achieved that imaging in high precision.
Accompanying drawing explanation
The structural representation of the millimeter wave FMCWSAR echo reception system that Fig. 1 provides for the embodiment of the present invention；
The structural representation of the frequency synthesizer of the generation Ka wave band FM linear continuous wave signal that Fig. 2 provides for the embodiment of the present invention
Figure.
Detailed description of the invention
Hereinafter, the present invention is further elaborated in conjunction with the accompanying drawings and embodiments.
As in figure 2 it is shown, the frequency synthesizer of generation Ka wave band FM linear continuous wave signal provided by the present invention includes:
Crystal oscillator 1, direct digital synthesis technique unit 2, PDRO4, the first merit divide the 3, second merit to divide 5, first order upconverting unit 6, second
Level upconverting unit 7, multiplier unit 9；Described crystal oscillator 1 divides 3 inputs to be connected with the first merit, and described first merit divides the outfan of 3
Connect the input of direct digital synthesis technique unit 2, the input of PDRO4, the outfan of PDRO4 and the second merit divide 5 defeated
Entering end to connect, the second merit divides the outfan of 5 to connect input and the input of first order upconverting unit 6 of multiplier unit 9, times
Frequently the outfan of unit 9 connects the input of second level upconverting unit 7, and the outfan of direct digital synthesis technique unit 2 is even
Connecing the input of first order upconverting unit 6, the outfan of first order upconverting unit 6 connects second level upconverting unit 7
Input.It is 1250MHz that described direct digital synthesis technique unit 2 produces mid frequency, with the linear frequency modulation of a width of 300MHz
Signal, described linear FM signal carries out second level up-conversion with 4 frequency-doubled signals of the signal that PDRO4 produces, and the second level becomes
Frequently the outfan of unit 7 exports Ka wave band height fm linearity wideband correlation to bonder 8.
Described crystal oscillator uses high stability crystal oscillator, for the reference source of millimeter wave FMCWSAR echo reception system.The long frequency stabilization of crystal oscillator
Rate degree of stability is 510-8/ s, short steady frequency stability is 810-10/ s, the phase noise of crystal oscillator: be not more than-132.3dBc/
Hz@100Hz, is not more than-152.3dBc/Hz@1kHz；The rated voltage of crystal oscillator is 5V.
Described direct digital synthesis technique unit uses AD9914 model, and internal clock speed is 3.5GSPS, frequency tuning
Resolution is 190pHz, uses 32 bit parallel data path interfaces, broadband clutter recognition be not less than 55dBc, power supply use+
1.8V/3.3V.Described crystal oscillator output signal is after the first merit is divided, and a road is as the clock of direct digital synthesis technique unit, separately
One tunnel is as the clock of PDRO, and it is 1250MHz that Direct Digital Frequency Synthesizers produces mid frequency, with the big band of a width of 300MHz
Wide linear FM signal, after carrying out first order up-conversion with the point-frequency signal that frequency is 7400MHz of PDRO generation, then with
4 frequency-doubled signals of the signal that PDRO produces carry out second level up-conversion, it is achieved Ka wave band height fm linearity wide-band LFM
Signal.
The Ka wave band Continuous Wave with frequency modulation signal 300MHz bandwidth range internal linear degree produced is not more than 3 ‰.Phase at 100Hz
Position noise be not more than-75dBc/Hz, 1kHz place phase noise be not more than at-95dBc/Hz, 10kHz phase noise no more than-
In 110dBc/Hz, 300MHz bandwidth range, clutter recognition is higher than 55dBc.
The present invention provides the work side of the frequency synthesizer of described generation Ka band broadband frequency modulation alignment consistency ripple signal
Method, including: step one, crystal oscillator output signal are after the first merit is divided, and a road is as the clock of direct digital synthesis technique unit, separately
An outer road is as the clock of PDRO；Step 2, Direct Digital Frequency Synthesizers produce linear FM signal；Step 3, described line
Property the point-frequency signal that produces of FM signal and PDRO carry out first order up-conversion；Step 4, first order up-conversion signal and PDRO
4 frequency-doubled signals of the signal produced carry out second level up-conversion, and the second level up-conversion signal of formation is Ka band signal.
Fig. 2 show the millimeter wave FMCWSAR echo reception system of the frequency synthesizer using the embodiment of the present invention to provide
Schematic diagram.
Although the present invention is open as above with preferred embodiment, but it is not for limiting the present invention, any this area
Technical staff without departing from the spirit and scope of the present invention, may be by the method for the disclosure above and technology contents to this
Bright technical scheme makes possible variation and amendment, therefore, every content without departing from technical solution of the present invention, according to the present invention
Technical spirit any simple modification, equivalent variations and modification that above example is made, belong to technical solution of the present invention
Protection domain.
Claims (6)
1. produce the frequency synthesizer of Ka wave band FM linear continuous wave signal, it is characterised in that including: crystal oscillator, Direct Digital
Frequency synthesis unit, PDRO, the first merit are divided, the second merit is divided, first order upconverting unit, second level upconverting unit, frequency multiplication list
Unit；Described crystal oscillator and the first merit divide input to connect, and the outfan that described first merit is divided connects direct digital synthesis technique unit
Input, the input of PDRO, input that the outfan of PDRO and the second merit are divided connects, and the outfan that the second merit is divided connects
The input of multiplier unit and the input of first order upconverting unit, the outfan of multiplier unit connects second level up-conversion list
The input of unit, the outfan of direct digital synthesis technique unit connects the input of first order upconverting unit, in the first order
The outfan of converter unit connects the input of second level upconverting unit.
2. according to the frequency synthesizer of the generation Ka wave band FM linear continuous wave signal described in claim 1, it is characterised in that
The steady frequency stability of length of described crystal oscillator is 510-8/ s, short steady frequency stability is 810-10/ s, the phase noise of crystal oscillator:
It is not more than-132.3dBc/Hz@100Hz, is not more than-152.3dBc/Hz@1kHz；The rated voltage of crystal oscillator is 5V.
3. according to the frequency synthesizer of the generation Ka wave band FM linear continuous wave signal described in claim 1, it is characterised in that
Described direct digital synthesis technique unit uses AD9914 model, and internal clock speed is 3.5GSPS, and frequency tuning resolution is
190pHz, uses 32 bit parallel data path interfaces, and broadband clutter recognition is not less than 55dBc, power supply employing+1.8V/3.3V.
4. according to the frequency synthesizer of the generation Ka wave band FM linear continuous wave signal described in claim 1, it is characterised in that
Described direct digital synthesis technique unit produces linear FM signal, and the mid frequency of described linear FM signal is 1250MHz,
Carry a width of 300MHz.
5. the frequency synthesizer of the generation Ka wave band FM linear continuous wave signal that in Claims 1-4, any one is provided
Method of work, it is characterised in that including: step one, crystal oscillator output signal after the first merit is divided, a road as Direct Digital frequency
The clock of rate synthesis unit, an other road is as the clock of PDRO；Step 2, Direct Digital Frequency Synthesizers produce linear frequency modulation
Signal；The point-frequency signal that step 3, described linear FM signal produce with PDRO carries out first order up-conversion；Step 4, first
4 frequency-doubled signals of the signal that level up-conversion signal produces with PDRO carry out second level up-conversion, the second level up-conversion letter of formation
Number it is Ka band signal.
6. use the frequency of the generation Ka wave band FM linear continuous wave signal that any one is provided in Claims 1-4 to close
The millimeter wave FMCWSAR echo reception system grown up to be a useful person, it is characterised in that with described frequency synthesizer as signal source.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018090687A1 (en) * | 2016-11-16 | 2018-05-24 | 深圳市华讯方舟卫星通信有限公司 | Ka-band transmitter |
| CN109975768A (en) * | 2019-05-15 | 2019-07-05 | 成都锦江电子***工程有限公司 | The Ka audio range frequency synthesizer used based on radar |
| CN110830060A (en) * | 2019-11-26 | 2020-02-21 | 北京无线电测量研究所 | Radio frequency signal generating device and method |
| CN110995260A (en) * | 2019-12-17 | 2020-04-10 | 陕西长岭电子科技有限责任公司 | Frequency deviation error control system based on linear frequency modulation signal |
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| CN102497208A (en) * | 2011-12-23 | 2012-06-13 | 无锡华测电子***有限公司 | Broadband X-band direct frequency synthesizer and signal generation method |
| CN103675780A (en) * | 2013-12-26 | 2014-03-26 | 北京航天测控技术有限公司 | Ku (K-under) wave band fully-coherent radar target simulator |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018090687A1 (en) * | 2016-11-16 | 2018-05-24 | 深圳市华讯方舟卫星通信有限公司 | Ka-band transmitter |
| CN109975768A (en) * | 2019-05-15 | 2019-07-05 | 成都锦江电子***工程有限公司 | The Ka audio range frequency synthesizer used based on radar |
| CN109975768B (en) * | 2019-05-15 | 2024-04-09 | 成都锦江电子***工程有限公司 | Ka wave band frequency synthesizer based on radar |
| CN110830060A (en) * | 2019-11-26 | 2020-02-21 | 北京无线电测量研究所 | Radio frequency signal generating device and method |
| CN110995260A (en) * | 2019-12-17 | 2020-04-10 | 陕西长岭电子科技有限责任公司 | Frequency deviation error control system based on linear frequency modulation signal |
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