CN108169720A - X-band low phase noise navigation frequency modulated continuous wave radar emission system - Google Patents
X-band low phase noise navigation frequency modulated continuous wave radar emission system Download PDFInfo
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- CN108169720A CN108169720A CN201810127637.5A CN201810127637A CN108169720A CN 108169720 A CN108169720 A CN 108169720A CN 201810127637 A CN201810127637 A CN 201810127637A CN 108169720 A CN108169720 A CN 108169720A
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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
- G01S7/28—Details of pulse systems
- G01S7/282—Transmitters
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- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
X-band low phase noise navigation frequency modulated continuous wave radar emission system of the present invention, is made of linear frequency modulation module, mixing type phase-locked loop module, high stable local oscillator module and double frequency power amplification module；Linear frequency modulation module contains the first oscillator, DDS, the first bandpass filter and microprocessor；Mixing type phase-locked loop module is sequentially connected and is formed by phase discriminator, loop filter, voltage controlled oscillator, frequency mixer and the second bandpass filter；High stable local oscillator module is made of the second oscillator and the connection of the first frequency multiplier, and the output terminal of the first frequency multiplier is connect with the frequency mixer of mixing type phase-locked loop module；Double frequency power amplification module is mainly sequentially connected by the second frequency multiplier, radio-frequency filter and power amplifier and formed, the input terminal of second frequency multiplier is connect with another output terminal of the voltage controlled oscillator of mixing type phase-locked loop module, power amplifier output X-band linear FM signal.The advantages that present invention tool improves phase noise performance and reduces cost.
Description
Technical field
The invention belongs to pathfinder emission system technical field, more particularly, to X-band peculiar to vessel navigation CW with frequency modulation
Radar emission system.
Background technology
Marine navigation radar is mainly used for the Detection And Tracking of naval target, and auxiliary ship station navigation collision prevention ensures navigation peace
Entirely.
Traditional marine navigation radar is based on non-coherent pulse magnetron system, but is limited in itself by its system, deposits
In following limitation：1st, magnetron generally requires the preheating time of 3 minutes, can not directly use；2nd, magnetron radar
The limitation of the modulated pulse width of distance resolution, when remote, distance resolution is poor；3rd, due to magnetron missing pulse
It influences, minimum range is restricted；4th, magnetron needs high-voltage modulation, reduces the reliability of entire radar；5th, magnetic control
Pipe needs replacing after a period of use, increases the cost of maintenance.
With the development of science and technology, having used the solid-state pathfinder of linear frequency modulation technology, advantage is to use solid-state devices,
Good reliability, without preheating time, range resolution is good, and minimum range is small, and transmission power is small, the radiationless wound to human body
Evil, it is cheap the advantages that, still, due to Modulation Continuous Wave Radar using solid-state oscillator generate transmitting linear frequency modulation
Signal, final low frequency signal can directly be generated by emitting after signal is mixed with the echo-signal coherent received, and radar emission
The phase noise of system can then directly influence detectivity of the radar system to Small object, this is one and still unsolved asks
Topic, is the research emphasis in this field and subject urgently to be resolved hurrily so how to reduce the phase noise of entire emission system.
Invention content
The object of the present invention is to overcome the X-band low phase noise navigation frequency modulated continuous wave radar transmitting system of the prior art
Phase noise existing for system directly influence radar system to the detectivity of Small object and it is at high price the defects of, provide one
Kind can reduce design and manufacture cost, optimize the X-band low phase noise navigation frequency modulated continuous wave radar transmitting system of noise coefficient
System.
The purpose of the present invention is what is be achieved through the following technical solutions.
A kind of X-band low phase noise navigation frequency modulated continuous wave radar emission system, it is characterized in that, system is mainly by linear
FM module, mixing type phase-locked loop module, high stable local oscillator module and double frequency power amplification module composition；Linear frequency modulation module packet
Include the first oscillator, DDS (direct digital synthesiser), the first bandpass filter and microprocessor, the input terminal connection first of DDS
Oscillator, the output terminal of DDS connect the first bandpass filter, and DDS is controlled by the microprocessor being connected electrically；Mixing type locks phase
Ring moulds block is in turn connected into closed loop institute group by phase discriminator, loop filter, voltage controlled oscillator, frequency mixer and the second bandpass filter
Into phase discriminator is connect with the output terminal of the first bandpass filter of the linear frequency modulation module；High stable local oscillator module is by second
Oscillator and the first frequency multiplier connection composition, the output terminal of the first frequency multiplier are connect with the frequency mixer of mixing type phase-locked loop module；
Double frequency power amplification module is mainly sequentially connected by the second frequency multiplier, radio-frequency filter and power amplifier and formed, the second frequency multiplication
The input terminal of device is connect with another output terminal of the voltage controlled oscillator of mixing type phase-locked loop module, power amplifier output X-band
Linear FM signal.
DDS, reference clock of first oscillator as DDS are outputed signal to by the first vibration source of linear frequency modulation module.
DDS is controlled by microprocessor, can directly generate linear FM signal, modulation linearity degree is good, and phase noise is small；DDS is exported
Linear FM signal through the first band-pass filter, then the linear FM signal enters the mirror of mixing type phase-locked loop module
Frequency device and loop filter input voltage controlled oscillator again, and voltage controlled oscillator has two-way output, wherein being delivered to times of system all the way
Frequency power amplifier module, another way add in feedback signal transmission to frequency mixer；At the same time, by the second of high stable local oscillator module
Relatively more low-frequency local oscillation signal occurs for oscillator, and mixing is input to after the first frequency multiplier frequency multiplication of high stable local oscillator module
The frequency mixer of formula phase-locked loop module, with generating intermediate-freuqncy signal after carrying out the another way signal mixing of voltage controlled oscillator output,
The intermediate-freuqncy signal likewise enters phase discriminator formation closed loop phase lock by being used as feedback signal after the second bandpass filter；Work as mixing type
After phaselocked loop PGC demodulation, the feedback signal can be consistent with the phase of the output reference signal of linear frequency modulation module.It is mixed
Frequency formula phase-locked loop module output signal is transmitted to the second frequency multiplier of double frequency power amplification module, the second frequency multiplication by voltage controlled oscillator
The signal of device output amplifies after radio-frequency filter filters through power amplifier again, final output X-band linear FM signal.
The invention is characterized in that using phaselocked loop more low-frequency than X-band (PLL) design is operated in, reuse again
Signal frequency conversion to X-band, some system complexities are slightly increased although doing so for frequency mode, the larger reduction system of energy
System design and cost and the larger optimization noise coefficient of manufacture.
Preferred embodiment, the first oscillator use SAW oscillator, reference clock of first oscillator as DDS,
Working frequency is in 868MHz；The Frequency Locking of mixing type phase-locked loop module is in 4.3GHz or so.
The design is designed using the mixing type phase-locked loop module of 4.3GHz or so, compared to X-band allocation in 8-
12GHz, the frequency are less than the frequency of X-band, you can, can be significantly using price more cheap voltage controlled oscillator and frequency mixer
Save design and manufacture cost.The linear FM signal exported by mixing type phase-locked loop module, into double frequency power amplification module, warp
After crossing frequency multiplication, X-band radio frequency is changed to.
The prior art be it is direct generate X-band, structure it is of high cost, be particularly due to make in phaselocked loop closed loop
With N times of frequency divider, finally the phase noise of signal can be in the base of DDS reference signal phase noises in loop filter bandwidth
Deteriorate 20log (N) dB on plinth, and the invention avoids this deficiencies.
Preferred embodiment, DDS select the AD9957 chips of ADI companies, in one 8 rank of AD9557 delivery outlets connection, passband
Chebishev (Chebyshev) bandpass filter that 1dB ripples rise and fall.
One 8 rank of design, the Chebishev bandpass filters that 1dB texts wave rises and falls in passband after AD9557 outputs, can be with
Obtain the intermediate frequency (IF) Linear FM signal of high quality.
Preferred embodiment, phase discriminator use the ADF4002 chips of ADI companies, and ADF4002 is by a low noise digital phase demodulation
Device, one accurately current pump, a programmable N times of frequency divider and the reference count of one 14 form.
That voltage controlled oscillator is selected is the ROS_4725_119 of Mini Circuits companies, and function admirable, anharmonic wave is miscellaneous
Scattered degree of suppression can reach 90dBc.
Preferred embodiment, loop filter use a 3 rank passive loop filters, loop filter bandwidth 15MHz.
Preferred embodiment, the delivery outlet of voltage controlled oscillator are connected to one using the BFP640 triodes realization of company of Infineon
Linear amplifier.
This is not only used to the output power of amplification voltage controlled oscillator, it is often more important that reduces the traction effect of voltage controlled oscillator
Should, improve the frequency stability that voltage controlled oscillator exports.
Preferred embodiment, high stable local oscillator module design are the SAW oscillators based on a high stable, then again
It is exported after 5 frequency multiplication of output frequency of oscillator, the signal of 5 frequency multiplication output and the signal of voltage controlled oscillator output are mixed in frequency mixer
Generate intermediate frequency feedback signal after frequency, then intermediate frequency feedback signal by the second bandpass filtering after, inhibit fundamental wave and other be no
Harmonic component only retains 5 order harmonic components.
SAW oscillator is equally realized using colpitts respective outer side edges surface acoustic wave resonances body, in order to preferably carry
The phase noise performance of high SAW oscillator, surface wave resonant body select the RO3164D-3 of RFM companies.
Preferred embodiment, the second frequency multiplier uses Infineon's BFP640 triodes, is biased in B classes amplification region, using putting
Big device it is non-linear, the output frequency frequency multiplication of voltage controlled oscillator to X-band；The Butterworth of 4 ranks is connected in its output terminal
Bandpass filter.
The beneficial effects of the invention are as follows：
1st, the Fractional-N frequency device in the phaselocked loop closed loop of the prior art has been evaded, so as to improve the 20log of whole system
(N) phase noise performance of dB；
2nd, using more low-frequency PLL designs are operated in, frequency multiplication mode is reused, the technology of signal frequency conversion to X-band
Scheme reduces system design cost well；
3rd, avoid the prior art by voltage directly control X-band voltage controlled oscillator generate linear FM signal and
The defects of modulation linearity degree of the linear FM signal of generation is bad especially overcomes and is produced by DDS, frequency mixer and oscillator
The deficiency of phase noise and high cost existing for raw X-band FM signal；
4th, phase noise performance improves detectivity of the radar system to Small object；
5th, one 8 rank of design, the Chebishev bandpass filters that 1dB ripples rise and fall in passband after AD9557 outputs, carry
Degree of suppression anharmonic wave noise restraint outside high band can reach 90dBc.
6th, the output terminal of voltage controlled oscillator is connected to one and is linearly put using what company of Infineon BFP640 triodes were realized
Big device, this is not only used to the output power of amplification voltage controlled oscillator, it is often more important that reduces the pulling effect of voltage controlled oscillator, carries
The frequency stability of high voltage controlled oscillator output.
7th, using a 3 rank passive loop filters, when overcoming the loop filter of low bandwidth reduces phase lock loop locks
Between deficiency, loop filter bandwidth 15MHz.
Description of the drawings
Fig. 1 is a kind of structure block diagram of embodiment of the present invention；
Fig. 2 is the block diagram that prior art voltage control voltage controlled oscillator generates X-band FM signal；
Fig. 3 is that the prior art directly generates X-band FM signal block diagram by DDS, frequency mixer and oscillator；
Fig. 4 is that prior art one kind generates X-band FM signal block diagram by DDS and N times of phaselocked loop；
Fig. 5 is the X-band low phase noise of an embodiment of the present invention navigation frequency modulated continuous wave radar emission system peculiar to vessel
Emit the actual measurement schematic diagram of linear FM signal frequency.
In figure, linear frequency modulation module 1；First oscillator 11；DDS12；First bandpass filter 13；Microprocessor 14；It is mixed
Frequency formula phase-locked loop module 2；Phase discriminator 21；Loop filter 22；Voltage controlled oscillator 23；Frequency mixer 24；Second bandpass filter 25；
High stable local oscillator module 3；Second oscillator 31；First frequency multiplier 32；Double frequency power amplification module 4；Second frequency multiplier 41；Radio frequency
Wave filter 42；Power amplifier 43.
Specific embodiment
It elaborates below in conjunction with the accompanying drawings to the embodiment of the present invention：The present embodiment using technical solution of the present invention before
It puts and is implemented, give detailed embodiment and specific operating process, but protection scope of the present invention is not limited to down
The embodiment stated.
Embodiment：As shown in Figure 1, a kind of X-band low phase noise navigation frequency modulated continuous wave radar emission system, system master
It to be made of linear frequency modulation module 1, mixing type phase-locked loop module 2, high stable local oscillator module 3 and double frequency power amplification module 4；Line
Property FM module 1 include the first oscillator 11, the 12, first bandpass filters 13 of DDS (direct digital synthesiser) and microprocessor
14, DDS12 input terminal connects the first oscillator 11, and the output terminal of DDS12 connects the first bandpass filter 13, DDS12 by with
Its microprocessor 14 being electrically connected controls；Mixing type phase-locked loop module 2 is by phase discriminator 21, loop filter 22, voltage controlled oscillator
23rd, 24 and second bandpass filter 25 of frequency mixer is in turn connected into closed loop and is formed, phase discriminator 21 and the linear frequency modulation module 1
The first bandpass filter 13 output terminal connection；High stable local oscillator module 3 is connected by the second oscillator 31 and the first frequency multiplier 32
Composition is connect, the output terminal of the first frequency multiplier 32 is connect with the frequency mixer 24 of mixing type phase-locked loop module 2；Double frequency power amplification module
4 are mainly sequentially connected and are formed by the second frequency multiplier 41, radio-frequency filter 42 and power amplifier 43, the input of the second frequency multiplier 41
End is connect with another output terminal of the voltage controlled oscillator 23 of mixing type phase-locked loop module 2, and it is linear that power amplifier 43 exports X-band
FM signal.
In Linear Frequency Modulation module 1, generated since the phase noise of DDS12 reference clocks can directly influence DDS12
The phase noise of frequency signal, so the first oscillator 11 in Linear Frequency Modulation module 1 is based on colpitts respective outer side edges sound
Surface wave resonant body realizes that surface acoustic wave resonance body uses the RO3164D-3, resonant frequency 868.35MHz of RFM companies.
First oscillator 11 generates clock reference of the stable 868.35MHz frequencies of oscillation as AD9957DDS12 chips.Microprocessor
14 use the STM32F103 of ST companies to pass through 14 digital control AD9957 of microprocessor as micro-chip processor and generate intermediate frequency line
Property FM signal, particular by serial line interface control AD9957 chips CS, SCLK and SDI/O pin, generate 290MHz extremely
The linear FM signal that 310MHz, i.e. intermediate frequency are 300MHz, bandwidth is 20MHz.Pass through the Chebishev first of 8 ranks again
Bandpass filter 13, the bandwidth of the first bandpass filter 13 is 20MHz, centre frequency 300MHz, is 1dB with interior rise and fall, this
Sample has effectively filtered out band stray signal caused by DDS12 digital signal synthesis.Due to 8 rank Chebishev bandpass filterings
Device uses lumped parameter design, and the attenuation in entire band is larger, and 1 final output of linear frequency modulation module is to mixing type phaselocked loop mould
For ADF4002 phase discriminators 21 in block 2 as with reference to signal, ADF4002 has the input range of reference signal certain requirement, institute
After 8 rank Chebishev bandpass filters, amplitude amplification has been carried out to generated linear FM signal.Here English is used
The BFR193 wideband low noises triode of Fei Ling companies is as amplifier tube, using based on by two low noise triode BFR193 structures
Into Wall overflow circuit as low noise amplifier circuit, the input of amplifier in can be effectively reduced by overflowing circuit using Wall
The Miller effect that capacitance dramatically increases improves the bandwidth of low-noise amplifier.
The voltage controlled oscillator that X-band is directly controlled by voltage that technical scheme of the present invention avoids the prior art generates
Linear FM signal and the defects of the bad modulation linearity degree of linear FM signal that generates, referring to Fig. 2, Fig. 3.
Technical scheme of the present invention, which is also overcomed, to be generated by DDS, frequency mixer and oscillator existing for X-band FM signal
The deficiency of phase noise and high cost, referring to Fig. 4.
Linear FM signal is after amplification, into the REFIN of the ADF4002 phase discriminators 21 of mixing type phase-locked loop module 2
Pin.Microprocessor 14 controls phase discriminator also by LE, CLK and DATA pin of serial line interface connection ADF4002 phase discriminators 21
21, setting loop divide N value are 1.The backfeed loop pin RFINA of ADF4002 phase discriminators 21, which is received, carrys out voltage controlled oscillator 23
With generated closed feedback loop signal after the signal mixing of high stable local oscillator module 3.Mixing type is locked used by the design
Phase ring moulds block 2 eliminates N times of frequency divider of conventional phase locked loops on closed loop, is mixed using with another local oscillator F1
Mode the frequency of voltage controlled oscillator Fvco to IF signal frequency Fvco-F1, since frequency mixer 24 can generate
Undesire frequency is spuious, so the signal after mixing carries out phase by entering back into phase discriminator 21 after second bandpass filter 25 again
Bit comparison, after phase lock loop locks, the output frequency of the first oscillator 11 is Fvco=F1+Fref.The advantages of the design is,
The output phase noise of Fvco will not be degraded 20log (N) dB.This also just effectively raises output phase noiseproof feature.
Phase discriminator 21 is using the ADF4002 chips of ADI companies in the design, and ADF4002 is by a low noise digital phase demodulation
Device, one accurately current pump, a programmable N times of frequency divider and the reference count of one 14 form.Voltage controlled oscillation
That device 23 is selected is the ROS_4725_119 of Mini Circuits companies.Its function admirable, anharmonic wave noise restraint can reach
90dBc。
Most important design and the difficult point of design are loop filter 22, the property of loop filter 22 in PLL designs
Can to output frequency locking time of entire phaselocked loop, signal frequency is spuious, phase noise and stability have important influence.One
The loop filter 22 of a low bandwidth can enhance spuious and phase noise performance, but can reduce phase lock loop locks when
Between.A 3 rank passive loop filters are used in the design.Loop filter bandwidth is 15MHz.
Have after the output of voltage controlled oscillator 23 and be connected to one using the linear of company of Infineon BFP640 triodes realization
Amplifier, this is not only used to the output power of amplification voltage controlled oscillator, while more importantly reduces leading for voltage controlled oscillator 23
Draw effect, improve the frequency stability that voltage controlled oscillator 23 exports.
It is generated after the frequency mixing that exported due to the signal of high stable local oscillator module 3 with voltage controlled oscillator 23 and enters phase demodulation
The intermediate frequency feedback signal of device 21, so the phase noise performance of high stable local oscillator module 3 directly influences whether intermediate frequency feedback signal
Phase noise performance, for this defect, the surface acoustic wave based on a high stable is designed using by high stable local oscillator module 3
Oscillator, then being exported, then output frequency is passed through the second bandpass filter after 5 frequency multiplication of output frequency of the second oscillator 31
After 25, inhibit fundamental wave and other no harmonic components, only retain 5 order harmonic components, finally 5 order harmonic components are amplified defeated
Go out, can so overcome the phase noise of high stable local oscillator module 3 to the phase noise performance shadow of the intermediate frequency feedback signal after mixing
It rings.SAW oscillator equally uses colpitts respective outer side edges surface acoustic wave resonances body to realize, in order to better improve sound
The phase noise performance of surface-wave oscillator, surface wave resonant body select the RO3164D-3 of RFM companies.This surface wave resonance
The working frequency of body be 868.35MHz, unloaded quality factor be 24000,50 ohm have load quality factor be 4000, frequency temperature
Coefficient is only 0.032ppm/ degrees Celsius.5 frequency multipliers use the MGA86563 Low-noise GaAs mmic amplifiers of Agilent companies
It realizes, the working frequency of MGA86563, which can work to 6GHz, MGA86563, to be biased in B classes amplification region, utilize MGA86563
It is non-linear, generate 5 order harmonic components, after being filtered by the second bandpass filter 25, recycle Infineon company BFP640 tri-
868.35MHz is passed through 5 times by pole pipe (BFP640 is biased in A classes linear amplification region), 5 subfrequency component of Linear Amplifer
The signal of 4.341GHz is generated after frequency.
Double frequency power amplification module 4 is mainly by the second frequency multiplier 41, micro-strip band logical (radio frequency) wave filter 42 and power amplification
Device 43 forms.Second frequency multiplier 41 is biased in B classes amplification region, is utilized amplifier using Infineon's BFP640 triodes
Non-linear, the output frequency frequency multiplication of voltage controlled oscillator 23 to X-band, i.e., centre frequency is 9.282GHz, bandwidth is 40MHz's
Linear FM signal.Since the second frequency multiplier can introduce other harmonic components, so being irrigated in the Bart that its output devises 4 ranks
This bandpass filter, Butterworth filter inband flatness is good, in this way will not be to the power of the linear FM signal after frequency multiplication
Amplitude has an impact, and due to being operated in X-band, realizes the design of entire wave filter using microstrip line here.The Butterworth of 4 ranks
The bandwidth of bandpass filter is 1.5GHz, insertion loss 0.5dB.After signal is by radio-frequency filter 42, ingoing power amplification
Circuit.In order to save design cost, simultaneously expensive single-chip X-band power amplifier chip is not used in the design, but uses string
Connection and the mode in parallel combined, design entire power amplification circuit.Power amplifier is by 2 grades of series connection amplification driving circuits and 1 grade
Amplifying circuit composition in parallel.The 1st grade of amplifying circuit designed by use by BFP64 triodes of series connection amplification driving circuit, the 2nd
Grade is by using the amplifying circuit designed by NLB-400 chips, and then signal is divided into two-way by micro-strip power distributing circuit, respectively
Carry out power amplification again, the power that 2 road signals after power distribution are designed each by NLB-400 chips and BFP650 triodes
Amplifying circuit series connection amplification, after the signal that two-way amplifies again further filters signal by a radio-frequency filter 43, through micro-
It carries out power combing with power synthesis circuit and passes through SMA interfaces to export.The gain of entire power amplifier is 21dB, final defeated
The peak power for going out signal is 20dBm.
X-band low phase noise navigation frequency modulated continuous wave radar emission system peculiar to vessel is equipped with two pieces of power modules, power supply mould
Block provides required operating voltage and electric current to modules.Linear frequency modulation module 1 locks phase by SMA cable connections to mixing type
Ring moulds block 2, high stable local oscillator module 3 are connected to 2 left side of mixing type phase-locked loop module, mixing type lock phase also by SMA connectors
The output of ring moulds block 2 is connected to double frequency power amplification module 4 by SMA connectors again, and last RF linear FM signal passes through
Delivery outlet exports.
Fig. 5 is actually to measure the navigation frequency modulated continuous wave radar emission system transmitting peculiar to vessel of obtained X-band low phase noise
Linear FM signal frequency diagram.As seen from the figure, the center frequency point of FM signal is 9.28GHz, bandwidth 40MHz, defeated
Go out power for 19.24dBm.According to measurement, when output signal is 9.28GHz, phase noise during frequency deviation 1kHz is only-
115dBc/Hz.The performance of this phase noise is fine, is entirely capable of meeting navigation frequency modulated continuous wave radar peculiar to vessel to phase noise
Demand.
A kind of X-band low phase noise navigation frequency modulated continuous wave radar emission system of the present invention, has and improves whole system
Phase noise performance and reduce system design cost the advantages that.It should be understood by those skilled in the art that the present invention is not by upper
The limitation of embodiment is stated, the above embodiments and description only illustrate the principle of the present invention, is not departing from the present invention
Under the premise of spirit and scope, various changes and improvements may be made to the invention, these changes and improvements both fall within claimed
In the scope of the invention.The scope of the present invention is defined by the appended claims and its equivalents.
Claims (8)
- The frequency modulated continuous wave radar emission system 1. a kind of X-band low phase noise navigates, it is characterized in that, system is mainly by linearly adjusting Frequency module, mixing type phase-locked loop module, high stable local oscillator module and double frequency power amplification module composition；Linear frequency modulation module includes First oscillator, DDS (direct digital synthesiser), the first bandpass filter and microprocessor, the input terminal connection first of DDS are shaken Device is swung, the output terminal of DDS connects the first bandpass filter, and DDS is controlled by the microprocessor being connected electrically；Mixing type phaselocked loop Module is in turn connected into closed loop institute group by phase discriminator, loop filter, voltage controlled oscillator, frequency mixer and the second bandpass filter Into phase discriminator is connect with the output terminal of the first bandpass filter of the linear frequency modulation module；High stable local oscillator module is by second Oscillator and the first frequency multiplier connection composition, the output terminal of the first frequency multiplier are connect with the frequency mixer of mixing type phase-locked loop module； Double frequency power amplification module is mainly sequentially connected by the second frequency multiplier, radio-frequency filter and power amplifier and formed, the second frequency multiplication The input terminal of device is connect with another output terminal of the voltage controlled oscillator of mixing type phase-locked loop module, power amplifier output X-band Linear FM signal.
- The frequency modulated continuous wave radar emission system 2. X-band low phase noise according to claim 1 navigates, it is characterized in that, First oscillator uses SAW oscillator, and reference clock of first oscillator as DDS, working frequency is in 868MHz； The Frequency Locking of mixing type phase-locked loop module is in 4.3GHz or so.
- The frequency modulated continuous wave radar emission system 3. X-band low phase noise according to claim 2 navigates, it is characterized in that, DDS selects the AD9957 chips of ADI companies, and 1dB ripples rise and fall in one 8 rank of AD9557 delivery outlets connection, passband Chebishev (Chebyshev) bandpass filter.
- 4. the X-band low phase noise navigation frequency modulated continuous wave radar emission system according to claim 1,2 or 3, special Sign is that phase discriminator uses the ADF4002 chips of ADI companies, and ADF4002 is by a low noise digital phase discriminator, and one accurately Current pump, a programmable N times of frequency divider and the composition of the reference count of one 14.
- The frequency modulated continuous wave radar emission system 5. X-band low phase noise according to claim 4 navigates, it is characterized in that, Loop filter uses a 3 rank passive loop filters, loop filter bandwidth 15MHz.
- The frequency modulated continuous wave radar emission system 6. X-band low phase noise according to claim 5 navigates, it is characterized in that, The delivery outlet of voltage controlled oscillator is connected to a linear amplifier realized using company of Infineon BFP640 triodes.
- The frequency modulated continuous wave radar emission system 7. X-band low phase noise according to claim 6 navigates, it is characterized in that, High stable local oscillator module design is the SAW oscillator based on a high stable, then again the output frequency of oscillator 5 It is exported after frequency multiplication, the signal of 5 frequency multiplication output and the signal of voltage controlled oscillator output the generation intermediate frequency feedback after frequency mixer mixing Signal, then intermediate frequency feedback signal by the second bandpass filtering after, inhibit fundamental wave and other no harmonic components, only retain 5 Order harmonic components.
- The frequency modulated continuous wave radar emission system 8. X-band low phase noise according to claim 7 navigates, it is characterized in that, Second frequency multiplier uses Infineon's BFP640 triodes, is biased in B classes amplification region, using amplifier nonlinearity, pressure The output frequency frequency multiplication of oscillator is controlled to X-band；The Butterworth bandpass filter of 4 ranks is connected in its output terminal.
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| CN201810127637.5A CN108169720B (en) | 2018-02-08 | 2018-02-08 | X-band low-phase noise navigation frequency modulation continuous wave radar transmitting system |
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