CN106026929B - The down-conversion device and down conversion method of broadband Ka frequency range - Google Patents
The down-conversion device and down conversion method of broadband Ka frequency range Download PDFInfo
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- CN106026929B CN106026929B CN201610308397.XA CN201610308397A CN106026929B CN 106026929 B CN106026929 B CN 106026929B CN 201610308397 A CN201610308397 A CN 201610308397A CN 106026929 B CN106026929 B CN 106026929B
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Abstract
The present invention provides the down-conversion device and its down conversion method of a kind of broadband Ka frequency range, and device therein includes Ka-X frequency range low-converter and X frequency range low-converter；Wherein, Ka-X frequency range low-converter is used to obtain the radiofrequency signal of the Ka frequency range through the amplification of the first low-noise amplifier, and exports after downconverting to X frequency range to X frequency range low-converter；X frequency range low-converter is used to downconvert to the radiofrequency signal of the X frequency range received the intermediate-freuqncy signal of 1.2GHz ± 500MHz.Using the down-conversion device and down conversion method of Ka frequency range in broadband provided by the invention, the signal of the Ka frequency range of 25~27.5GHz bandwidth can be downconverted to the intermediate-freuqncy signal of 1.2GHz ± 500MHz, while meet X frequency range down coversion link compliance.
Description
Technical field
The present invention relates to satellite data ground receiving system device link technical fields to be more specifically related to a kind of width
Down-conversion device and down conversion method with Ka frequency range.
Background technique
With the increasingly increase of earth observation satellite-ground link volume of transmitted data, information code rate is higher and higher, signal bandwidth
It is more and more wider, be not able to satisfy big data quantity transmission with existing satellite-ground link and form contradiction, star data transmission from traditional X
It is following trend that frequency range, which is adjusted to Ka frequency range,.
In the downlink signal link of earth observation satellite data ground receiving system, the signal of antenna feed reception channel is passed through
After crossing low-noise amplifier amplification, by low-converter by frequency translation to lower frequency range, after optical transmitter and receiver transmits, using
Satellite initial data is obtained after the processing such as demodulator demodulation, decoding, frame synchronization.Low-converter is as satellite ground data receiver system
The key equipment of system downlink, the quality of performance directly influence the performance indicator of downlink.
It is passed under S/X frequency range currently, earth observation satellite data generally use, and corresponding ground receiving system also base
It is built in S/X frequency range.In order to solve the contradiction between remote sensing information and the data transmission capabilities of satellite-ground link, Current Domestic
Outer space mission is also changed from present S/X frequency range to Ka frequency range.Therefore, if to be carried out under satellite data using Ka frequency range
It passes, the equipment to its corresponding ground receiving system is needed to upgrade.It builds and upgrades in remote sensing satellite data receiving system
In, technical requirements that are higher, updating are proposed to the development of the low-converter of downlink.
Summary of the invention
In view of the above problems, the object of the present invention is to provide a kind of down-conversion device of broadband Ka frequency range and down coversion sides
The radiofrequency signal of the Ka frequency range of 1GHz bandwidth is downconverted to the intermediate-freuqncy signal of 1.2GHz ± 500MHz by method, to realize Ka frequency range
The down coversion of remote sensing satellite receives link high bandwidth.
The present invention provides a kind of down-conversion device of broadband Ka frequency range, comprising: becomes under Ka-X frequency range low-converter and X frequency range
Frequency device；Wherein, Ka-X frequency range low-converter, for obtaining the radiofrequency signal of the Ka frequency range through the amplification of the first low-noise amplifier,
And it exports after downconverting to X frequency range to the X frequency range low-converter；X frequency range low-converter, X frequency range for will receive
Radiofrequency signal downconverts to the intermediate-freuqncy signal of 1.2GHz ± 500MHz.
The present invention also provides a kind of down conversion methods of broadband Ka frequency range, comprising:
Step 1:Ka-X frequency range low-converter obtains the radiofrequency signal for the Ka frequency range amplified through the first low-noise amplifier, and
The radiofrequency signal that will acquire exports after downconverting to X frequency range to X frequency range low-converter；
The radiofrequency signal of the X frequency range received is downconverted to 1.2GHz ± 500MHz's by step 2:X frequency range low-converter
Intermediate-freuqncy signal.
Using the down-conversion device and down conversion method of Ka frequency range in broadband provided by the invention, it can satisfy earth observation and defend
In sing data ground receiving system downlink to the mirror image inhibition of Ka down coversion link, Out-of-band rejection, noise coefficient, input/
The key technical indexes such as output VSWR, 1db compression point, group delay, amplitude flatness, local oscillator noise and reliability
It is required that.
In order to realize upload and related purpose, one or more aspects of the present invention include be particularly described below and
The feature particularly pointed out in claim.Certain illustrative aspects of the invention is described in detail in the following description and the annexed drawings.
However, these aspects indicate only usable some of the various ways in the principles of the present invention.In addition, of the invention
It is intended to include all such aspects and their equivalent.
Detailed description of the invention
By reference to the following description in conjunction with the accompanying drawings and the contents of the claims, and with to it is of the invention more comprehensively
Understand, other objects and results of the present invention will be more clearly understood and understood.In the accompanying drawings:
Fig. 1 is the link structure schematic diagram according to the down-conversion device of the broadband Ka frequency range of the embodiment of the present invention；
Fig. 2 is the logical construction schematic diagram according to the Ka-X frequency range low-converter of the embodiment of the present invention；
Fig. 3 is the link structure schematic diagram according to the Ka-X frequency range low-converter of the embodiment of the present invention；
Fig. 4 is the local oscillator theory structure schematic diagram according to the local oscillator unit of the embodiment of the present invention；
Fig. 5 is the link structure schematic diagram according to the X frequency range low-converter of the embodiment of the present invention；
Fig. 6 is the local oscillator theory structure schematic diagram according to the local oscillator module of the embodiment of the present invention；
Fig. 7 is the flow chart according to the down conversion method of the broadband Ka frequency range of the embodiment of the present invention.
Identical label indicates similar or corresponding feature or function in all the appended drawings.
Specific embodiment
Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Fig. 1 shows the link structure of Ka frequency range down-conversion device in broadband according to an embodiment of the present invention.
As shown in Figure 1, the down-conversion device of Ka frequency range in broadband provided by the invention, including Ka-X frequency range low-converter 2 and X
Frequency range low-converter 3；Wherein, Ka-X frequency range low-converter 2 docks the first low-noise amplifier 1, and Ka-X frequency range low-converter 2 is used
The radiofrequency signal of the 25GHz~27.5GHz Ka frequency range formed after the amplification of the first low-noise amplifier 1 is downconverted to
The radiofrequency signal of 7.5GHz~8.5GHz X frequency range, and export to X frequency range low-converter 3；X frequency range low-converter 3 and demodulator 4
Docking, X frequency range low-converter 3 are used to the radiofrequency signal of 7.5GHz~8.5GHz X frequency range downconverting to 1.2GHz ± 500MHz
Intermediate-freuqncy signal export to demodulator 4, realize the frequency down-conversion function of Ka band satellite signal.
As shown in Fig. 2, Ka-X frequency range low-converter 2 includes: input signal processing unit 21, output signal processing unit
22, local oscillator unit 23, the first frequency mixer 24 and network controller 25, the input terminal of the first frequency mixer 24 is respectively and at input signal
Unit 21, the connection of local oscillator unit 23 are managed, and the output end of the first frequency mixer 24 is connect with output signal processing unit 22, network control
Device 25 processed is connect with input signal processing unit 21, local oscillator unit 23 respectively；Wherein, input signal processing unit 21 is for external
It is defeated after the radiofrequency signal of 25GHz~27.5GHz Ka frequency range of portion's input carries out Isolation, amplification, decaying and isolation processing
Out to the first frequency mixer 24；Local oscillator unit 23 is included for equipment and external video source inputs two ways to 24 frequency conversion of the first frequency mixer
Local oscillation signal needed for frequency range；First frequency mixer 24 is for providing the radiofrequency signal of the Ka frequency range received with local oscillator unit 23
Local oscillation signal be mixed, export 7.5GHz~8.5GHz X frequency range radiofrequency signal；Output signal processing unit, being used for will
After the radiofrequency signal of 7.5GHz~8.5GHz X frequency range of first frequency mixer output carries out Isolation, amplification and attenuation processing,
It exports to X frequency range low-converter 3；Network controller 25 for receive network control signal and to input signal processing unit 21,
The decaying of output signal processing unit 22 and the frequency range of local oscillation signal are set.
As shown in figure 3, input signal processing unit includes sequentially connected first isolator 211, level-one radio-frequency filter
212, the second low-noise amplifier 213, the first attenuator 214 and the second isolator 215；Wherein, the first isolator 211 for pair
The radiofrequency signal of 25GHz~27.5GHz Ka frequency range carries out input isolation；Level-one radio-frequency filter 212 is used for after input isolation
The radiofrequency signal of Ka frequency range be filtered；Second low-noise amplifier 213 is used for the radiofrequency signal to filtered Ka frequency range
It amplifies；First attenuator 214 is for decaying to the radiofrequency signal of amplified Ka frequency range；Second isolator 215 is used
Output isolation is carried out in the radiofrequency signal to the Ka frequency range after decaying, and output to the first frequency mixer 24, network controller 25 can be with
The signal pad value of the first attenuator 214 is controlled according to network configuration instruction.
It should be noted that the radiofrequency signal of 25~27.5GHz Ka frequency range is first through the first isolator 211, it is ensured that good
Input standing wave.Then it filters out through level-one radio-frequency filter 212 with outer unrelated interruptions, and ensures that image frequency inhibits and intermediate frequency inhibition refers to
Mark, while filtering out the back leakage of local oscillator unit 23.The link image frequency is 9~11.5GHz, suppression of the filter to the frequency range
It is formed with 75dBc or more, meets index request.There is the inhibition of 75dBc or more to 7.5~8.5GHz of intermediate-frequency band simultaneously, satisfaction refers to
Mark requires.In addition the level-one radio-frequency filter 212 has the inhibition of 75dBc or more to local frequency, adds the first frequency mixer 24
The 35dBc of itself inhibits, and the local oscillator leakage of input port can guarantee below -80dBm.
The signal exported from level-one radio-frequency filter 212 is again to the second low-noise amplifier 213, second low noise amplification
Device 213 has the low-noise factor of 1.3dB and the high-gain of 24dB, it can be ensured that chain noise factor index is met the requirements, from
Decaying of the signal of two low-noise amplifiers 213 output again through the first attenuator 214 enters the second isolator 215, mixed to first
The standing wave of frequency device 24 does certain improvement, and matching effect guarantees the indexs such as inband flatness.Other devices selected by link exist simultaneously
There is good flatness index in corresponding band, additionally by meticulous debugging, the available guarantee of the index of inband flatness.
First frequency mixer 24 selects double balanced mixer, and spuious to even combination have good inhibitory effect.
First attenuator, 214 numerical-control attenuator is used for adjust gain, and attenuation range is ± 30dB, and stepping 1dB in this way may be used
Junior's link is avoided to be saturated so that link gain is adjusted flexibly.
The group delay characteristic of Ka-X frequency conversion link is mainly determined by the filter in channel.The group delay characteristic master of filter
There are much relations with the attenuation change at its order, passband and stop-band transition.There is level-one radio-frequency filter in the frequency conversion channel
212 and first second level intermediate-frequency filter 222 and the second second level intermediate-frequency filter 227, the Group Delay Ripple of entire channel be better than
0.3ns+1ns × 2=2.3ns.
The key technical indexes that Ka-X frequency range low-converter 2 is realized is as follows: input frequency: 25GHz~27.5GHz；Output
Frequency: 7.5GHz~8.5GHz；Gain controllable range: 0~30dB, 1dB stepping；Mirror image inhibition >=60dBc；Out-of-band rejection >=
55dBc；Noise coefficient≤13dB；Input/output standing-wave ratio: 1.5:1；Third order intermodulation≤- 45dBc；Harmonics restraint >=-55dBc；
Intermediate frequency inhibition >=60dB；1dB compression point >=+7dBm；Group delay≤1.5ns (f0 ± 200MHz) ,≤3ns (f0 ± 500MHz)；
Amplitude flatness≤± 1.0dB (1GHz) ,≤± 0.75dB (700MHz) ,≤± 0.5dB (any 50MHz)；Local vibration source phase
Noise≤- 80dBc/Hz@100Hz or≤- 88dBc/Hz@1KHz or≤- 90dBc/Hz@10KHz or≤- 97dBc/Hz@
100KHz or≤- 112dBc/Hz@1MHz.
Output signal processing unit includes sequentially connected third isolator 221, the first second level intermediate-frequency filter 222,
One π type resistor network 223, third low-noise amplifier 224, the second attenuator 225, the 4th low-noise amplifier 226 and second
Second level intermediate-frequency filter 227；Wherein, the radiofrequency signal for the X frequency range that third isolator 221 is used to export the first frequency mixer 24 into
Row input isolation；First second level intermediate-frequency filter 222 is used to be filtered the radiofrequency signal of the X frequency range after input isolation；The
One π type resistor network 223 is used to carry out the decaying of π type to the radiofrequency signal of filtered X frequency range；Third low-noise amplifier 224
It is amplified for the radiofrequency signal to the X frequency range after the decaying of π type；Second attenuator 225 is used for the X frequency range by amplification
Radiofrequency signal decays；4th low-noise amplifier 226 is used to carry out the radiofrequency signal of the X frequency range through overdamping output to put
Greatly；Second second level intermediate-frequency filter 227 is used to carry out output filtering to the radiofrequency signal for exporting amplified X frequency range.
It should be noted that the output of the first frequency mixer 24 terminates third isolator 221, it is to do good matching, really
Protect the indexs such as flatness；It is spuious that first second level intermediate-frequency filter 222 can filter out radio frequency leakage, local oscillator leakage and the combination of each rank.
The Out-of-band rejection degree of the first second level intermediate-frequency filter 222 can satisfy index request in 70dBc or more.4th low noise is put
Big device 226 selects high-gain, Gao Sanjie, high output P-1dB amplifier, and has good gain flatness in the application band
Characteristic.By link simulation it can be seen that output of products P-1dB is+15dBm；The second last second level intermediate-frequency filter 227, it is main
Filter out harmonic wave, it is ensured that harmonics restraint index meets the requirement of 55dBc, and ensures good output standing wave.
Network controller 25 can be instructed according to network configuration and be controlled the signal pad value of the second attenuator 225,
To realize gain ranging adjustment to signal；It can also be realized by external video source synchronous with the clock of external equipment.
In addition, being set respectively in the front end of input signal processing unit 21, the first frequency mixer 24, output signal processing unit 22
It is equipped with isolator, it is therefore intended that realize the isolation of signal reflex.
It can also be seen that local oscillator unit 23 is connect with a bandpass filter 231 from Fig. 3, bandpass filter 231 and one
A isolator 232 connects, and isolator 232 is connect with the first frequency mixer 24；Network controller 25 can be instructed according to network configuration
Selected control is carried out to the local oscillator point frequency of local oscillator unit 23.
The principle of local oscillator unit 23 is as shown in figure 4, when local vibration source 41 uses 100MHz constant-temperature crystal oscillator to make reference for phaselocked loop
Clock realizes that the adjusting range of local frequency is 17.5GHz~19GHz by the way of being mixed locking phase；Wherein local vibration source 41 can be with
External outer frequency vibration source is used as local oscillator clock after frequency multiplication, locking phase.
Specifically, local vibration source 41 uses 100MHz constant-temperature crystal oscillator to make reference clock, fractional frequency division, with 100MHz for phaselocked loop
It for phase demodulation frequency, is mixed in ring using the PDRO sampling phase-looked of 15GHz and phaselocked loop first, generates 2.5GHz~4GHz and return
Ring signal exports 17.5GHz~19GHz signal into phase discriminator (PhaseDetector abbreviation PD) 42 phase demodulations.Sampling phase-looked medium
The phase noise of oscillator (SAMPLINGPHASE LOCKED OSCILLATOR OF MEDIUM, abbreviation PDRO) 46 is stringent
It mutually makes an uproar according to crystal oscillator and deteriorates 3+20logN, so the phase noise of PDRO46 is far superior to require index.So local vibration source 41
Phase noise depend primarily on phaselocked loop.Locking phase chip uses the phase discriminator 42 of HITTITE, and the normalization of phase discriminator 42 is made an uproar bottom
For -230dBc/Hz.First phaselocked loop is Broadband emission, selected voltage controlled oscillator (Voltage Controlled
Oscillator, abbreviation VCO) 44 have the characteristics that broadband, low phase noise.Loop filter 43 is put using low noise operational
Big device AD797 constitutes active loop filter, can be very good to reduce deterioration of the amplifier to phase noise.
According to theory of PLL, the selection of optimal loop bandwidth is the phase noise specifications according to reference crystal oscillator and VCO45
Come what is determined.The project optimal loop bandwidth selection is 500kHz.
Local vibration source 41 uses twin nuclei, and main ring is by phase discriminator 42, the first frequency mixer 24, loop filter 43, VCO45 structure
At subring is made of local vibration source 41, phase discriminator 42, the first frequency mixer 24 and PDRO46, and point of main ring is reduced by subring
Frequency device, so as to improve phase noise performance.In-band phase noise can estimate by formula PN=PNtot+10logFpfd+20logN,
Circuit is considered that 1MHz is in except loop bandwidth by 5dB to the deterioration of phase noise in practical application, and mutually making an uproar for VCO45 is taken to subtract
Go penalty value.By calculating, local vibration source phase noise actual value can reach: -82dBc/Hz@100Hz, -93dBc/Hz@1kHz, -
95dBc/Hz@10kHz, -102dBc/Hz@100kHz, -115dBc/Hz@1MHz.
When radio frequency input is 25~26GHz, corresponding X frequency range is 7.5~8.5GHz, and local frequency mutually should be at this time
17.5GHz；3 ranks combine spuious 2*LO-RF=35GHz- (25~26GHz)=9~10GHz, the passband of 7.5~8.5GHz of distance
Recently, there is 500MHz distance, by the inhibition of frequency mixer and filter, this is spuious better than 70dBc.
When radio frequency input is 25.5~26.5GHz, corresponding X frequency range is 7.5~8.5GHz, and local frequency mutually should be at this time
18GHz；3 ranks combine spuious 2*LO-RF=36GHz- (25.5~26.5GHz)=9.5~10.5GHz, 7.5~8.5GHz of distance
Passband it is nearest, have 1GHz distance, by the inhibition of frequency mixer and filter, this is spuious to be better than 75dBc.
When radio frequency input is 26~27GHz, corresponding X frequency range is 7.5~8.5GHz, and local frequency mutually should be at this time
18.5GHz；3 ranks combine spuious 2*LO-RF=37GHz- (26~27GHz)=10~11GHz, apart from passband have 1.5GHz away from
From by the inhibition of frequency mixer and filter, this is spuious better than 75dBc.
When radio frequency input is 26.5~27.5GHz, when corresponding X frequency range is 7.5~8.5GHz, local frequency is corresponded at this time
For 19GHz；3 ranks combine miscellaneous 2*LO-RF=38GHz- (26.5~27.5GHz)=10.5~11.5GHz, combine spuious separate
Used band, spurious reduction index can be better than 75dBc.
The link structure of Ka-X frequency range low-converter is described in detail in above content, and giving below will be to X frequency range low-converter
Link structure be illustrated.X frequency range low-converter will mainly be changed under 7.5~9.0GHzX frequency range radiofrequency signal 1200MHz ±
The intermediate-freuqncy signal of 500MHz, channel gain 30dB, 1dB stepping.In the present invention, the bandwidth of X frequency range low-converter is 1.5GHz,
Frequency band covers existing 7.9~8.9GHz X frequency range down coversion 1GHz bandwidth demand, realizes compatibility.
Fig. 5 shows the link structure of X frequency range low-converter according to an embodiment of the present invention.
As shown in figure 5, X frequency range low-converter includes: input signal processing module, frequency mixing module and output signal processing mould
Block, the input terminal of frequency mixing module are connect with input signal processing module, frequency mixing module respectively, and output end and the output signal
Processing module connection；Wherein, input signal processing module be used to carry out the radiofrequency signal of the X frequency range received Isolation,
After amplification, output to frequency mixing module；Frequency mixing module includes the second frequency mixer 501 and local vibration source 502, and the second frequency mixer 501 will be defeated
The radiofrequency signal for entering the X frequency range of signal processing module output is mixed into intermediate-freuqncy signal with the local oscillation signal of local vibration source 502；Output letter
Number processing module exports the intermediate-freuqncy signal of 1.2GHz ± 500MHz after being decayed to intermediate-freuqncy signal, filtering, amplify.
Input signal processing module includes that sequentially connected 4th isolator 503, radio frequency input filter the 504, the 5th are low
Noise amplifier 505 and the 5th isolator 506；Wherein, the 4th isolator 503 is used for the radiofrequency signal to the X frequency range received
Carry out input isolation；Radio frequency input filter 504 is used to be filtered the radiofrequency signal of the X frequency range by isolation；5th is low
Noise amplifier 505 is for amplifying the radiofrequency signal of filtered X frequency range；5th isolator 506 is used for process
The radiofrequency signal of the X frequency range of amplification carries out output isolation.
Output signal processing module includes sequentially connected 2nd π type resistor network 507, the first intermediate-frequency filter 508,
Six low-noise amplifiers 509, third attenuator 510, the 7th low-noise amplifier 511, the second intermediate-frequency filter 512 and the 3rd π
Type resistor network 513；Wherein, the 2nd π type resistor network 507 is used to carry out π type to the radiofrequency signal of the X frequency range received to decline
Subtract；First intermediate-frequency filter 508 is used to be filtered the radiofrequency signal of the X frequency range by the decaying of π type；6th low noise amplification
Device 509 is for amplifying the radiofrequency signal of filtered X frequency range；Third attenuator 510 is used for the X frequency by amplification
The radiofrequency signal of section decays；The radiofrequency signal of 7th X frequency range of 511 pairs of the low-noise amplifier through overdamping amplifies；
Second intermediate-frequency filter 512 is used to be filtered the radiofrequency signal of the X frequency range by amplification；3rd π type resistor network 513 is used
The decaying of π type is carried out in the radiofrequency signal to filtered X frequency range.
Local vibration source 502 and the connection of phaselocked loop (Phase Locked Loop, abbreviation PLL) 514, phaselocked loop 514 and a filter
Wave device 515 connects, which connect with isolator 516, and isolator 516 is connect with the second frequency mixer 501.
It should be noted that the input terminal of input signal processing module is the 4th isolator, product can be effectively ensured and stay
Wave requirement, the output of the 4th isolator terminate radio frequency input filter 504, and the standing wave of radio frequency input filter 504 requires to be less than
1.3, and connecting resistance π type match circuit, it is ensured that output of products standing wave is less than 1.5.
Selected other devices on channel have good flatness index, between each device in used frequency range
Good matching has also been made.Pass through meticulous debugging simultaneously, it can be ensured that gain flatness meets index request.
504 passband of radio frequency input filter of X frequency range low-converter 3 is 7.5~9.0GHz, it is needed to image frequency
And the leakage of local oscillator back is inhibited.Image frequency is 5100~6600MHz in the project, and filter can in the inhibition of the frequency range
To reach 70dBc or more, meets mirror image and inhibit the requirement for being greater than 60dBc.
Band stray inhibition is mainly guaranteed by the first intermediate-frequency filter 508 and the second intermediate-frequency filter 512.The filter of second intermediate frequency
The effect of wave device 512 is to filter out the local oscillator noise product using single-conversion.Radio frequency and local frequency do not have all far from intermediate-frequency band
There is combination is spuious to fall in interior and band edge, can satisfy band stray and inhibit to require.
Second frequency mixer has the LO-RF of 20dB to be isolated, and all low-noise amplifiers have 35dB in X frequency range low-converter 3
Reverse isolation, the 4th isolator 503 and the 5th isolator 506 share the isolation of 50dB, can calculate rf inputs
Local oscillator leakage level is below -80dBm.
The spuious emulation 2RF-2LO of most important combination is fallen in band, i.e., harmonic wave is fallen in band, but inhibition reach 55dBc with
On, it can satisfy requirement.Remaining combination is smaller, or far from used band
Fig. 6 shows the local oscillator theory structure of local oscillator module according to an embodiment of the present invention.
As shown in fig. 6, the X frequency range low-converter local frequency is 6300~7800MHz, realized using phase-locked loop manner.
100MHz constant-temperature crystal oscillator is used to make reference clock for phaselocked loop, using 100MHz as phase demodulation frequency, fractional-N divide locking phase exports local oscillator
Frequency.For phase discriminator (PD) 61 using the HMC704 of HITTITE, normalizing bottom of making an uproar is -230dBc/Hz.Loop filter 63 is adopted
Active loop filter is constituted with low noise operational amplifier AD797, can be very good to reduce deterioration of the amplifier to phase noise.
Voltage controlled oscillator (VCO) 62 selects HMC507, it has the characteristics that broadband, low phase noise, and frequency can cover 6300~
7800MHz, phase noise can reach -115dBc/Hz at 100kHz.One low-noise amplifier 64 of VCO62 connection, low noise
Amplifier 64 is connect with the filter 515 in Fig. 5.
According to theory of PLL, the selection of optimal loop bandwidth is the phase noise specifications according to reference crystal oscillator and VCO62
Come what is determined.The present invention has selected the super Low phase noise constant-temperature crystal oscillator of 100MHz, phase noise specifications are as follows: -153dBc/Hz
1kHz,-160dBc/Hz@10kHz,-165dBc/Hz@100kHz,-165dBc/Hz@1MHz.Since output frequency is
7800MHz deteriorates 20log (7800/100)=38dB with interior crystal oscillator phase noise, and crystal oscillator index is -115dBc/Hz@after deterioration
1kHz,-122dBc/Hz@10kHz,-127dBc/Hz@100kHz,-127dBc/Hz@1MHz.The phase noise specifications of VCO are as follows:-
60dBc/Hz@1kHz,-90dBc/Hz@10kHz,-115dBc/Hz@100kHz,-135dBc/Hz@1MHz.Crystal oscillator phase noise
The intersection point of curve and VCO phase noise curve is at 400kHz, i.e., optimal loop bandwidth selection is 400kHz.
In-band phase noise can estimate by formula PN=PNtot+10logFpfd+20logN, i.e. PN=-230+10log
(100 × 106)+20log (7800/100)=- 112dBc/Hz@10kHz, circuit presses the deterioration of phase noise in practical application
5dB considers, then mutually making an uproar for final output local oscillation signal can achieve -107dBc/Hz@10kHz, -110dBc/Hz@100kHz.
1MHz is in except loop bandwidth, takes mutually making an uproar for VCO to subtract penalty value, about -130dBc/Hz@1MHz.
Down-conversion device with above-mentioned broadband Ka frequency range is relative to the present invention also provides a kind of down coversions of broadband Ka frequency range
Method.
As shown in fig. 7, the down conversion method of Ka frequency range in broadband provided by the invention, comprising:
Step S1:Ka-X frequency range low-converter obtains the radiofrequency signal for the Ka frequency range amplified through the first low-noise amplifier,
And the radiofrequency signal that will acquire downconverts to after X frequency range output to X frequency range low-converter；
The radiofrequency signal of the X frequency range received is downconverted to 1.2GHz ± 500MHz's by step S2:X frequency range low-converter
Intermediate-freuqncy signal.
Specifically, step S1 includes:
Step S11: by the input signal processing unit in Ka-X frequency range low-converter to the Ka frequency range by amplification
After radiofrequency signal carries out Isolation, amplification, decaying and isolation processing, output to the first frequency mixer；
The local oscillation signal that the S12: the first frequency mixer of step provides the radiofrequency signal of the Ka frequency range received and local oscillator unit
It is mixed, exports output signal processing unit of the radiofrequency signal of X frequency range into the Ka-X frequency range low-converter；
Step S13: the radiofrequency signal for the X frequency range that the first frequency mixer exports is isolated, is filtered by output signal processing unit
After wave, amplification and attenuation processing, output to X frequency range low-converter；
Step S2 includes:
Input signal processing module in step S21:X frequency range low-converter to the radiofrequency signal of the X frequency range received into
After row Isolation, amplification, the frequency mixing module into X frequency range low-converter is exported.
Step S22: the radiofrequency signal for the X frequency range that the second frequency mixer in frequency mixing module exports input signal processing module
It is mixed into intermediate-freuqncy signal with the local oscillation signal of the local vibration source in frequency mixing module, exports at the output signal in X frequency range low-converter
Manage module.
Step S23: after output signal processing module decays to intermediate-freuqncy signal, is filtered, being amplified, output 1.2GHz ±
The intermediate-freuqncy signal of 500MHz.
More specifically, step S11 includes:
Step S111: the radio frequency of the first isolator in input signal processing unit to 25GHz~27.5GHz Ka frequency range
Signal carries out input isolation
Step S112: the level-one radio-frequency filter in input signal processing unit is to the radio frequency for inputting the Ka frequency range after being isolated
Signal is filtered.
Step S113: the second low-noise amplifier in input signal processing unit believes the radio frequency of filtered Ka frequency range
It number amplifies.
Step S114: the first attenuator in input signal processing unit carries out the radiofrequency signal of amplified Ka frequency range
Decaying.
Step S115: the second isolator in input signal processing unit carries out the radiofrequency signal of the Ka frequency range after decaying
Output isolation, output to the first frequency mixer.
Step S13 includes:
Step S131: the radio frequency for the X frequency range that the third isolator in output signal processing unit exports the first frequency mixer
Signal carries out input isolation；
Step S132: the first second level intermediate-frequency filter in output signal processing unit is to the X frequency range after input isolation
Radiofrequency signal is filtered.
Step S133: the radiofrequency signal of the first π type resistor network in output signal processing unit to filtered X frequency range
Carry out the decaying of π type.
The radio frequency of third low-noise amplifier in step S134 output signal processing unit to the X frequency range after the decaying of π type
Signal amplifies.
Step S135: the second attenuator in output signal processing unit to the radiofrequency signal of the X frequency range by amplification into
Row decaying.
Step S136: the radio frequency of the 4th low-noise amplifier in output signal processing unit to the X frequency range through overdamping
Signal carries out output amplification.
Step S137: the second second level intermediate-frequency filter in output signal processing unit is to the amplified X frequency range of output
Radiofrequency signal carries out output filtering.
Step S21 includes:
Step S211: the 4th isolator in input signal processing module carries out the radiofrequency signal of the X frequency range received
Input isolation.
Step S212: the radio frequency input filter in input signal processing module believes the radio frequency of the X frequency range by isolation
It number is filtered.
Step S213: the radio frequency of the 5th low-noise amplifier in input signal processing module to filtered X frequency range
Signal amplifies.
Step S214: the radiofrequency signal of X frequency range of the 5th isolator by amplification in input signal processing module carries out
Output isolation.
Step S23 includes:
Step S231: the radiofrequency signal of the 2nd π type resistor network in output signal processing module to the X frequency range received
Carry out the decaying of π type.
Step S232: radio frequency of first intermediate-frequency filter to the X frequency range to decay by π type in output signal processing module
Signal is filtered.
Step S233: the radio frequency of the 6th low-noise amplifier in output signal processing module to filtered X frequency range
Signal amplifies.
Step S234: third attenuator in output signal processing module to the radiofrequency signal of the X frequency range by amplification into
Row decaying.
Step S235: the radio frequency of the 7th low-noise amplifier in output signal processing module to the X frequency range through overdamping
Signal amplifies.
Step S236: the second intermediate-frequency filter in output signal processing module believes the radio frequency of the X frequency range by amplification
It number is filtered.
Step S237: the 3rd π type resistor network in output signal processing module believes the radio frequency of filtered X frequency range
Number carry out the decaying of π type.
In conclusion the invention enables the mirror image inhibition of Ka down coversion link, Out-of-band rejection, noise coefficients, input/output
The key technical indexes such as standing-wave ratio, 1db compression point, group delay, amplitude flatness, local oscillator noise and reliability satisfaction pair
The design requirement of ground observation satellite data ground receiving system downlink.
Describe Ka frequency range down coversion link according to the present invention in an illustrative manner above with reference to attached drawing.But ability
Field technique personnel should be appreciated that Ka-X the and X frequency range low-converter proposed for aforementioned present invention can also not depart from this
Various improvement are made on the basis of summary of the invention.Therefore, protection scope of the present invention should be by appended claims
Hold and determines.
Claims (1)
1. a kind of down conversion method of broadband Ka frequency range, by the radiofrequency signal of the Ka frequency range of 1GHz bandwidth downconvert to 1.2GHz ±
The intermediate-freuqncy signal of 500MHz, which comprises
Step 1:Ka-X frequency range low-converter obtains the radio frequency of the Ka frequency range through the first low-noise amplifier amplification 1GHz bandwidth
Signal, and the radiofrequency signal that will acquire downconverts to after X frequency range output to X frequency range low-converter；Wherein, under the Ka-X frequency range
Frequency converter includes: input signal processing unit, output signal processing unit, local oscillator unit, the first frequency mixer and network controller,
The input terminal of first frequency mixer is connect with the input signal processing unit, the local oscillator unit respectively, and output end with
Output signal processing unit connection, the network controller respectively with the input signal processing unit, the local oscillator list
Member connection；
The step 1 includes:
Step 11: passing through the penetrating to the Ka frequency range by amplification of the input signal processing unit in the Ka-X frequency range low-converter
After frequency signal carries out Isolation, amplification, decaying and isolation processing, output to the first frequency mixer；The input signal processing is single
Member includes: the first isolator being sequentially connected, level-one radio-frequency filter, the second low-noise amplifier, the first attenuator and second
Isolator；
Step 12: the local oscillation signal that first frequency mixer provides the radiofrequency signal of the Ka frequency range received and local oscillator unit into
Row mixing exports output signal processing unit of the radiofrequency signal of X frequency range into the Ka-X frequency range low-converter；
Step 13: the output signal processing unit is isolated by the radiofrequency signal for the X frequency range that first frequency mixer exports,
Filtering, amplification are exported with after attenuation processing to the X frequency range low-converter；The output signal processing unit includes: successively phase
Third isolator even, the first second level intermediate-frequency filter, the first π type resistor network, third low-noise amplifier, the second decaying
Device, the 4th low-noise amplifier and the second second level intermediate-frequency filter；
Wherein,
The step 11 includes:
Step 111: the first isolator in input signal processing unit to the radiofrequency signal of 25GHz~27.5GHz Ka frequency range into
Row input isolation；
Step 112: the level-one radio-frequency filter in input signal processing unit is to the radiofrequency signal for inputting the Ka frequency range after being isolated
It is filtered；
Step 113: the second low-noise amplifier in input signal processing unit to the radiofrequency signal of filtered Ka frequency range into
Row amplification；
Step 114: the first attenuator in input signal processing unit decays to the radiofrequency signal of amplified Ka frequency range；
Step 115: the second isolator in input signal processing unit exports the radiofrequency signal of the Ka frequency range after decaying
Isolation, output to the first frequency mixer, first frequency mixer select double balanced mixer；
The step 13 includes:
Step 131: the radiofrequency signal for the X frequency range that third isolator in output signal processing unit exports the first frequency mixer into
Row input isolation；
Step 132: the first second level intermediate-frequency filter in output signal processing unit believes the radio frequency of the X frequency range after input isolation
It number is filtered；
Step 133: the first π type resistor network in output signal processing unit carries out π to the radiofrequency signal of filtered X frequency range
Type decaying；
Step 134: the radiofrequency signal of third low-noise amplifier in output signal processing unit to the X frequency range after the decaying of π type
It amplifies；
Step 135: the second attenuator in output signal processing unit declines to the radiofrequency signal of the X frequency range by amplification
Subtract；
Step 136: the 4th low-noise amplifier in output signal processing unit to the radiofrequency signal of the X frequency range through overdamping into
Row output amplification；
Step 137: the second second level intermediate-frequency filter in output signal processing unit believes the radio frequency for exporting amplified X frequency range
Number carry out output filtering；
The radiofrequency signal of the X frequency range received is downconverted to the intermediate frequency of 1.2GHz ± 500MHz by step 2:X frequency range low-converter
Signal；Wherein,
The step 2 includes:
Step 21: the input signal processing module in the X frequency range low-converter carries out the radiofrequency signal of the X frequency range received
After Isolation, amplification, the frequency mixing module into the X frequency range low-converter is exported；
Step 22: the radio frequency for the X frequency range that the second frequency mixer in the frequency mixing module exports the input signal processing module
Signal is mixed into intermediate-freuqncy signal with the local oscillation signal of the local vibration source in the frequency mixing module, exports in the X frequency range low-converter
Output signal processing module；
Step 23: after the output signal processing module decays to the intermediate-freuqncy signal, filters, amplifying, exporting 1.2GHz
The intermediate-freuqncy signal of ± 500MHz.
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| CN109286373B (en) * | 2018-09-25 | 2022-08-16 | 安徽华东光电技术研究所有限公司 | Ku frequency band down converter |
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