CN109327229A - The spaceborne receiver jamproof system in broadband - Google Patents
The spaceborne receiver jamproof system in broadband Download PDFInfo
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- CN109327229A CN109327229A CN201811263217.6A CN201811263217A CN109327229A CN 109327229 A CN109327229 A CN 109327229A CN 201811263217 A CN201811263217 A CN 201811263217A CN 109327229 A CN109327229 A CN 109327229A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
- H04B1/0067—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with one or more circuit blocks in common for different bands
- H04B1/0082—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with one or more circuit blocks in common for different bands with a common local oscillator for more than one band
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
- H04B1/1036—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal with automatic suppression of narrow band noise or interference, e.g. by using tuneable notch filters
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
Abstract
The spaceborne receiver jamproof system in a kind of broadband disclosed by the invention, it is desirable to provide one kind has versatility, high stability, high reliability, is able to suppress the jamproof system of a variety of interference performances in spaceborne operation of receiver platform.The technical scheme is that: the spaceborne receiver in broadband is using variable-frequency solutions three times, interference signal of the input terminal by rf frequency sorting circuit, before inhibiting a mixing；One frequency mixer using local frequency up and down penetrate rate fold frequency mixing technique, by one mixing with two be mixed between IF frequency sorting circuit sub-elect an intermediate frequency；The local oscillation signal of one intermediate frequency and second level frequency mixer is mixed to fix two intermediate frequencies out, and function is divided into two-way output, and formation senior middle school's frequency wideband radar, which is detectd, all the way receives channel, and the mixed Low Medium Frequency out of the local oscillator of another way and three-mixer divides filtering unit to export as communication channel through intermediate frequency function.The present invention sorts measure by rf frequency and reinforces AF panel, improves anti-interference ability and reduces the design difficulty of local oscillator and intermediate frequency.
Description
Technical field
The present invention relates to a kind of highly sensitive radio-frequency transmitters that may be directly applied to each platform, broadband receiver interference suppression
System processed.
Background technique
With the raising of development and the user demand of spaceborne receiver technology: working frequency is wide, high sensitivity, dynamic range
Greatly, its realization complexity of receiver itself interference decision；Simultaneously in satellite operation platform equipment become increasingly complex, system function
Function is stronger and stronger, and the interference in satellite operation platform restricts the realization of receiver function.The electricity of the spaceborne receiver in broadband
Magnetic disturbance is divided into the fixed frequency interference of equipment room in satellite operation platform, power supply disturbance (referred to as fixed interference), working frequency range
Strong signal in range interferes (referred to as with interior interference) to the interference of weak signal, combination frequency, receiver internal analogue circuit, number
Interference (abbreviation internal interference) between word circuit, high-frequency circuit, low-frequency channel, no matter which kind of interference all influences to a certain extent
The performance of receiver.Fixed interference in satellite operation platform can pass through optimization receiving antenna, reinforcement receiver front end filtering
It realizes and inhibits；It is realized and is inhibited by the linearity of broadband Asia octave region filtering and raising circuit with interior interference；Internal circuit
Between interference can pass through optimization circuit, reinforce filtering, function division, shielding cavity isolation.Due to by current hardware digital circuit
The limitation of the factors such as operating rate, radar signal very high for frequency directly carry out A/D transformation and signal processing still in radio frequency
There is sizable difficulty in engineering realization.Compared with analog receiver, number is connect for wideband digital receiver and signal processing technology
There is also some disadvantages for receipts machine.Currently, for highly sensitive wide-band detection frequently be superhet and channelized receiver
It realizes, but is limited and high hardware cost factor by the volume and weight of spaceborne product, generally use more heterodyne system.Traditional
Superheterodyne receiver, it is in conversion process, gain dispersion is real on different frequency bands because it passes through high, medium and low multiple mixing
It is existing, it is advantageously implemented the high-gain of weak signal, high stable detects receipts；During broadband rf signal can be become to fixed, low after frequency conversion
Frequently, high squareness factor output signal reduces back end signal processing difficulty；Flexible allocation mixting circuit level at different levels can be passed through simultaneously
Size realizes that the Larger Dynamic of receiver, high sensitivity require.But superhet need to overcome conversion process from compatible design
In in, the combination frequency of image interference, radio frequency and local oscillator interfere, mutually crosstalk, secondary power supply interference etc. between high and low frequency.
Usual superhet broadband receiver uses high first local oscillator in broadband, exports high first intermediate frequency, reduces optical mixing process
It is middle generation with interior combined interference, but when frequency height arrive Ka frequency range after, high frequency, wideband circuit technique realization difficulty increase, circuit
Stability is poor.The cores such as wide-band low-noise amplifier, wide-band frequency mixer, wide-band frequency multiplier, microwave phase discriminator chip simultaneously
The heart and key components are to determine the key factor of performance, development progress and cost of picking, but its availability is poor, there is realization
Risk.So it is directed to the particularity of spaceborne product, while by import high-quality level, the embargo in broadband, high-performance component, with
And the high reliability request of the limitation of domestic aerospace grade component level, satellite borne equipment, it needs to pass through conjunction from overall performance
Manage the optimization design that implementation carries out indices.
At present the spaceborne operation of receiver frequency range in broadband mainly for communication, radar signal than comparatively dense VHF frequency range
It to X frequency range, and is installed in the cabin that narrow space, equipment are intensive, electromagnetic environment is severe, the interference in workbench has: over the ground
Number communication number, measurement and control signal, relaying number communication number between number communication number, star between star, star ground response, signal distribution and relaying observing and controlling letter
Number, high reject signal meeting jamming receiver leads to its disabler, and weak signal interference causes receiver to generate false response and makes
At system erroneous judgement；Broadband, Larger Dynamic are detectd in receipts, and the harmonic component of the strong signal of low frequency end in frequency range is fallen in, and can make to receive
Machine generates false response, causes system erroneous judgement；Superheterodyne receiver intrinsic intermediate frequency interference, image interference and radiofrequency signal
And its combined interference of harmonic component and local frequency and its harmonic component, so that receiver is generated false response, cause be
System erroneous judgement.Under normal conditions, receiver is to carry out customized according to the particularity of system application, is worked according to different application
Platform, for different targets, there are the difference of working frequency, the difference of receiving sensitivity level, signal systems for receiver
Difference, the difference of instant bandwidth, the difference of dynamic range, the difference of gain size, the difference of IF frequency, the difference of interference signal
Different, customization is stronger, while being influenced again by factors such as the cognition of designer, habit, styles, realizes in physical circuit
There are biggish difference, but the Anti-interference Design of receiver, frequency stream in complexity and in performance that final products show
Journey design method, theory are consistent.
Summary of the invention
The purpose of the present invention is place in view of the shortcomings of the prior art and meet the high-quality level device of spaceborne requirement
The limitation of part provides a kind of combination for being able to suppress interference in spaceborne operation of receiver platform, wide band radio-frequency interference, mixing generation
A variety of interference performances such as interference, have versatility, high stability, high reliability, can be realized the width of highly sensitive receive capabilities
With spaceborne receiver jamproof system, it is intended to which the anti-interference ability for solving broadband receiver under the electromagnetic environment of spaceborne complexity is weak
Problem.
Above-mentioned purpose of the invention can be reached by the following measures: a kind of spaceborne receiver jamproof system in broadband,
It include: rf frequency sorting circuit, IF frequency sorting circuit, Low Medium Frequency circuit and local oscillation circuit, it is characterised in that: radio frequency frequency
Rate sorting circuit is passed through the second level and is mixed by first order frequency mixer series connection IF frequency sorting circuit, IF frequency sorting circuit
Device two Low Medium Frequency circuits of series connection, two Low Medium Frequency circuits amplify filtering unit, local oscillation circuit by third level frequency mixer series connection intermediate frequency
Local vibration source is provided to above three frequency mixer respectively；Rf frequency sorting circuit before first order frequency mixer believes wide band radio-frequency
Number be divided into three frequency sub-band carries out interference signal filtering respectively, by the interference signal before a mixing be suppressed to sensitivity level with
Under；The broadband local oscillator frequency that one frequency mixer is provided according to local oscillation circuit folds frequency mixing technique using rate is penetrated up and down, obtains in double one
Frequent rate；Then it is exported by IF frequency sorting circuit to second level frequency mixer, is mixed with the local oscillation signal for entering two frequency mixers
Frequently two IF frequency are fixed in output, and function is divided into two-way, are formed senior middle school's frequency wideband radar all the way and are detectd receipts channel, another way and entrance
Local oscillation signal mixing three IF frequency of output of third level frequency mixer, form two after intermediate frequency function is divided to filtering unit amplification filtering
The signal of communication of road output, which is detectd, receives channel.
The present invention has the advantages that compared with the prior art.
Has versatility.A local oscillator broadband frequency hopping source of the invention is combined using monocycle frequency synthesizer of phase locking with frequency multiplier
Method simplifies circuit design, improves circuit stability.The small stepping frequency hopping local oscillator phase in narrowband is added using the big stepping frequency hopping local oscillator in broadband
In conjunction with design method, wide band radio-frequency frequency is changed into fixed intermediate frequency frequency.One local oscillation circuit of broadband is improved single by frequency multiplier
The output frequency of ring frequency synthesizer of phase locking expands frequency range, keeps the monocycle frequency synthesizer of phase locking of one, two local oscillators general；
Using frequency folding frequency mixing technique, double intermediate frequencies are exported, reaches an IF frequency no more than radio frequency range, makes IF frequency
Sorting circuit and device in rf frequency sorting circuit are general；By reasonable frequency process design, reduce broadband, high frequency,
The demand of high-performance component.Versatility is converted by specificity by component by the above measure, has reached circuit, component
Versatility, reduce the type of component, improve similar component number, and procurement process greatly simplifies, buying hour
Reduce significantly, the problem of it is uncontrolled to avoid quality, purchases minimum quantity of an order, and import component embargos risk, reduce backup type and
Quantity reduces buying, development cost, improves receiver development and production Saving in time costs, economic benefit.Meanwhile for difference
Apply workbench, different frequency, different technologies index request, suitably adjust frequency process, rf frequency sorting, in one
Frequent rate sorting, the design of one local vibration source of broadband constitute new receiver, improve the realisation of product development.
It is anti-interference.
Anti-interference ability improves.Rf frequency sorting circuit is used before the present invention one is mixed, broadband signal is divided into three
Frequency sub-band, and mode is joined using dual stage filter, (communication is counted to the interference signal in workbench counting communication number, star over the ground
Number, measurement and control signal, relaying number communication number between star, star ground response, signal distribution and relaying measurement and control signal) and IF frequency had
Effect inhibits, and an interference signal before mixed is suppressed to sensitivity level or less；The frequency range of each frequency sub-band is controlled in sub- frequency multiplication
Within journey, the big signal with interior low frequency end is avoided by the way that after low-noise amplifier, the harmonic component of generation is fallen into passband, is made
At the defect of receiver false response；The mixing schemes three times for taking a high local oscillator make an image frequency frequency far from rf frequency, one
IF frequency, the amplitude-frequency characteristic of each device itself can realize the higher degree of suppression of image frequency in rf frequency sorting circuit, improve
The anti-interference ability of receiver；A mixing uses high local oscillator mode simultaneously, makes the harmonic frequency of local oscillator far from an IF frequency, prevents
Only the fundamental wave and harmonic wave of local oscillator and radio frequency are fallen in a midband by the low order combined interference that frequency mixer generates；Pass through local oscillator frequency
Rate folds frequency mixing technique, and low radio frequency end and a local oscillation signal is made to fall in firing frequency frequency range by the mixed intermediate frequency out of a frequency mixer
It is interior, and firing frequency end and a local oscillation signal are fallen in low radio frequency frequency range by the mixed intermediate frequency out of a frequency mixer, improve an intermediate frequency
AF panel reduces the realization difficulty of filter.
Sensitivity enhancing.The present invention is using mixing scheme three times, a high local frequency, a high IF frequency, frequency sub-band
It divides, the reasonable distribution for cascading use, level of filter, by what is generated in the interference signal and optical mixing process in workbench
Combined interference is suppressed to sensitivity level or less；It is isolated by the zoning design and individual screen cavity of functional circuit in receiver
Design, is suppressed to sensitivity level or less for interfering with each other between digital-to-analog circuit, height frequency circuit.Actual test result of the present invention
Are as follows: linear dynamic reaches 70dB or more, and sensitivity reaches the design requirement of -125dBm.
Reliable performance, output are stablized.Broadband rf signal is divided into high and low two frequency ranges at the first mixing by the present invention,
With a local frequency by mixed two IF frequency out of a frequency mixer, and an IF frequency is not higher than radio frequency band, a mixing
Device uses frequency folding frequency mixing technique, i.e., one local oscillator of broadband frequency is folded into two frequency ranges of frequency translation above and below, respectively with penetrate
The mixed IF frequency double out of frequent rate, not only compress a local frequency range, while reducing an IF frequency.Thus corresponding two
One local frequency of section forms two sections of component frequency overlapping regions, limits a local oscillator highest frequency, while having compressed local oscillator frequency
Spend range, improve the availabilities of the key components such as phase discriminator, digital frequency divider in monocycle frequency synthesizer of phase locking to
Technique requirement, the design difficulty for reducing a circuit, stablize one local oscillation circuit reliable performance of broadband, output.
Detailed description of the invention
Fig. 1 is the circuit theory schematic diagram of the jamproof system of the spaceborne receiver in broadband of the present invention.
Fig. 2 is the schematic illustration of rf frequency sorting circuit shown in Fig. 1.
Fig. 3 is IF frequency sorting circuit schematic illustration shown in FIG. 1.
Fig. 4 is local oscillation circuit schematic illustration shown in Fig. 1.
Specific embodiment
Refering to fig. 1.In the embodiment described below, a kind of spaceborne receiver jamproof system in broadband includes: radio frequency frequency
Rate sorting circuit, IF frequency sorting circuit, Low Medium Frequency circuit and broadband local oscillator comprising two intermediate-frequency circuits and three intermediate-frequency circuits
Circuit.For rf frequency sorting circuit by first order frequency mixer series connection IF frequency sorting circuit, IF frequency sorting circuit is logical
Second level frequency mixer two intermediate-frequency circuits of series connection are crossed, two intermediate-frequency circuits amplify filtering unit by third level frequency mixer series connection intermediate frequency.
Receiver improves anti-interference ability using mixing schemes three times, and radio circuit is designed using multiple shielding cavities, prevents from doing between road
Disturb influence circuit stability；Working dc power is mutually isolated using filtering, secondary pressure, improves circuit stability.To overcome
Phase discriminator and digital frequency divider technical level limited and that meet spaceborne high quality product class requirement at present, receiver is using big
The design method that stepping broadband frequency jump synthesizer adds small stepping narrowband frequency hopping synthesizer to combine meets while exporting the radar of senior middle school's bandwidth band
Signal detects receipts and Low Medium Frequency narrow band communication signal detects receipts.
Wherein, rf frequency sorting circuit passes through first order frequency mixer series connection IF frequency sorting circuit, IF frequency point
Select circuit by second level frequency mixer two Low Medium Frequency circuits of series connection, two Low Medium Frequency circuits are put by third level frequency mixer series connection intermediate frequency
Big filtering unit, local oscillation circuit provide local vibration source to above three frequency mixer respectively；Rf frequency before first order frequency mixer
Broadband rf signal is divided into three frequency sub-band and carries out interference signal filtering respectively by sorting circuit, by the interference signal before a mixing
It is suppressed to sensitivity level or less；The broadband local oscillator frequency that one frequency mixer is provided according to local oscillation circuit is folded using rate is penetrated up and down
Frequency mixing technique obtains double IF frequency, then exports by IF frequency sorting circuit to second level frequency mixer, and into two
Two IF frequency are fixed in the local oscillation signal mixing output of frequency mixer, and function is divided into two-way, forms senior middle school's frequency wideband radar all the way and detects
Channel is received, another way is mixed three IF frequency of output with the local oscillation signal for entering third level frequency mixer, is formed by intermediate frequency function point
It is formed after filtering unit amplification filtering, the signal of communication of two-way output, which is detectd, receives channel.
According to the frequency process design of receiver, the spaceborne receiver in the present embodiment broadband uses the frequency stream of frequency conversion three times
Broadband signal is divided into three frequency sub-band by journey, and rf frequency sorting, IF frequency sorting, one local frequency of broadband fold
It is mixed three times, three times variable-frequency solutions, wherein a local oscillator output frequency control code and rf frequency are in one-to-one relationship, and root
According to the calculated value of rf frequency and two intermediate frequencies, the wideband frequency of two sections of band segment juxtapositions is obtained；Two local oscillators are two
A point frequency source being fixed as, frequency control code and rf frequency are in corresponding relationship；Three local oscillators be the small stepping frequency hopping synthesizer in narrowband, first
The corresponding local frequency of grade frequency mixer is the big stepping frequency hopping synthesizer in broadband of two sections of component frequency juxtapositions, output frequency with penetrate
Frequent rate is in one-to-one relationship, by believing the intermediate frequency that broadband rf signal is converted to two fixed frequencies after frequency mixer
Number.Frequency mixer corresponding two local frequency in the second level is two fixed frequent rates of point, exports selection and the rf frequency of frequency point
In corresponding relationship, mix two intermediate-freuqncy signals of fixed point frequency；Corresponding three local frequency of third level frequency mixer is the small stepping in narrowband
Frequency hopping synthesizer, the multi-functional demand that the system of adaptation handles signal of communication.
Refering to Fig. 2.Receipts requirement is detectd to meet high sensitivity, rf frequency sorts electricity respectively on three roads Ge Zhi, at every
It is first order filter in sequential series between the first order frequency choosing switch of branch and second level frequency choosing switch, low-noise amplifier, small
The second level filter of stepping adjustable attenuator and postposition, second level filter are one and the first order before low-noise amplifier
The consistent filter of filter is the image-rejection filter that can be substituted in conventional mixting circuit before frequency mixer, the present embodiment
It can be cascaded by dual stage filter and reinforce inhibiting.Wherein, the filter of first order filter is mainly for workbench interference signal
With the inhibition of middle frequency interference signal, it is ensured that low-noise amplifier works in linear zone；Second level filter mainly inhibits low noise
The harmonic component of the amplified interference signal of amplifier and radiofrequency signal is lower than sensitivity level, prevents receiver from generating false ring
It answers.The selection of the noise coefficient and gain size of low-noise amplifier is the noise coefficient for taking into account receiver, dynamic range, linear
The result of degree and low-noise amplifier realizability and high reliability.Big stepping controllable attenuator attenuation is 20dB, default
Work in pass-through state, under strong signal, decaying is started to control, realize communication leg 80dB can widen dynamic requirements, while prevent compared with
Strong radar signal influences the linearity of first order frequency mixer.According to above-mentioned mentality of designing, rf frequency sorting circuit is by two
Frequency choosing switch, 6 filters, 3 low-noise amplifiers, 3 small stepping adjustable attenuator and one big step are controllably into attenuator
Composition.The first order filter of each road, will be generated in the interference signal and optical mixing process in workbench in, image frequency
Signal is suppressed to certain degree, by low-noise amplifier amplified signal through small step adjustable attenuator, then filters through the second level
The interference signal of low-noise amplifier output end is suppressed to corresponding sensitivity level or less by wave device.
Broadband rf signal is divided into three frequency sub-band by rf frequency sorting circuit, is used on each frequency sub-band in sequential series
First order filter, low-noise amplifier, small stepping adjustable attenuator and second level filter, three frequency sub-band constitute three branch
Road, three frequencies select branch circuit parallel connection between two identical frequency choosing switches, and three tributary signals are exported to second level frequency choosing switch
Input terminal, and the second level frequency select output switching terminal connect one inhibit interference big stepping variable attenuator, by walking greatly
It is exported into controllable attenuator, eliminates the gain inequality of three branch roads.
Frequency choosing switch can be single-pole three-throw switch, and switch of the radiofrequency signal through first order single-pole three throw is divided into function one
Three frequencies caused select branch, and it is a frequency sub-band that each frequency, which selects branch, are equipped with the adjustable step of small stepping in three sub- band circuitries
Improved simultaneously into attenuator with the amplitude difference that the amplitude-frequency characteristic between balanced three frequency sub-band due to broadband device itself introduces
Port standing wave when wideband low noise amplifier and filter cascade.
Refering to Fig. 3.Operating frequency range of the invention is related to S, C, X frequency range, and a local oscillator uses high local oscillator mixing schemes,
Improve anti-interference ability.But an intermediate frequency is excessively high, and a local oscillator realizes that difficulty increases, and circuit stability is poor, and high performance device can get
There are risks for property；One intermediate frequency is too low, then a local frequency and rf frequency, IF frequency are separated by relatively close, and local oscillator leakage increasing connects
The design difficulty of receipts machine.So determining a local oscillator output frequency model according to the performance of existing phase discriminator, digital frequency divider, VCO
It encloses.Inhibition of the comprehensive rf frequency to the inhibition, IF frequency of intermediate frequency to radio frequency and local oscillator, using the mixing side of two intermediate frequencies
Formula improves degree of suppression, while simplifying the realization of a local oscillator source circuit.Rf frequency is divided into high and low two at a frequency mixer
Section falls in a high band radio frequency mixed IF frequency out in low-frequency range, and the mixed IF frequency out of low-frequency range radio frequency falls in height
In frequency range, there is the region that partly overlaps in the corresponding local frequency of high and low in this way two radio frequencies, have compressed local oscillator output frequency model
It encloses, reduces circuit and realize difficulty.
Inhibition of the comprehensive rf frequency to the inhibition, IF frequency of intermediate frequency to radio frequency and local oscillator, using two intermediate frequency
The mixing schemes of frequency range rf frequency (IF1-1, IF1-2) simplify a local oscillation circuit and intermediate-frequency circuit design, while improving one
Intermediate-frequency filter efficiency.I.e. rf frequency is divided into high and low two sections at a frequency mixer by IF frequency sorting circuit, and RF-1 is low
Frequency, the frequent rate of a medium-high frequency that RF-2 is high band, make a medium-high frequency frequency RF- of high band radio frequency in the one of frequency range
2 and one local frequency LO1-2 by a frequency mixer go out a medium-high frequency frequency IF1-2 fall in Frequency in the one of low-frequency range
In RF-1, low-frequency range one in a Frequency RF-1 and local frequency LO1-1 by a frequency mixer go out one in low frequency it is frequent
Rate IF1-1 falls in the medium-high frequency frequency RF-2 in high band, the corresponding local frequency (LO1- of high and low in this way two radio bands
1, LO1-2) there is the region that partly overlaps, local oscillator reference frequency output is had compressed, circuit is reduced and realizes difficulty.IF frequency point
The effect for selecting low-pass filter in circuit is to prevent a local oscillation signal by mixer leakage to intermediate-frequency channel, by low-pass filter
Subsequent amplifier pushes away saturation.Attenuator in two branches is small stepping adjustable attenuator, adjusts the width of two intermediate-frequency channels
It is poor to spend.Choosing switch is used in conjunction with intermediate-frequency filter in two branches and realizes IF frequency sorting again and again in two, reinforces combined interference
Inhibit.
Based on above-mentioned mentality of designing, IF frequency sorting circuit includes before receiving rf frequency sorting circuit shown in Fig. 2
Two frequency sub-band rf frequency RF1 and third frequency sub-band rf frequency RF2, it is corresponding to export a local frequency LO1-1 and one
The frequency mixer of vibration frequency LO1-2 and its low-pass filter and amplifier in sequential series, and the intermediate frequency of the connection amplifier
Frequency sorts loop；Wherein, a frequency mixer is connected after connecting with low-pass filter with amplifier, amplifier series connection single-pole three throw
It switchs, attenuators in series is parallel to single-pole three-throw switch again after single-pole three-throw switch two intermediate-frequency filters of parallel connection.
Frequency mixer it is mixed go out one in a Frequency IF1-1 and medium-high frequency frequency IF1-2, high and low frequency signal in two one
IF1-1, IF1-2 are by low-pass filter, after amplifier amplifies, are opened by choosing again and again in first in IF frequency sorting loop
Pass is divided into two-way, is filtered by the first branch and the concatenated filter of second branch, exports Frequency in one respectively
An IF1-1 and medium-high frequency frequency IF1-2, two frequency signals of high and low frequency attenuator decaying through respective branch road respectively in one
Afterwards, then through choosing switch exports according to rf frequency one in IF1-1 or IF1-2 again and again in second.IF frequency sorting circuit
The effect of low-pass filter in two branches is to inhibit the first local oscillation signal, prevents the first local oscillation signal from passing through mixer leakage
To intermediate-frequency channel, the amplifier of low pass filter is pushed away into saturation, influences receiver normal work, the decaying in two branches
Device is small stepping adjustable attenuator, for adjusting the amplitude difference of two intermediate-frequency channels.Choosing switch is model one again and again in two
The single-pole three-throw switch of cause, with two branch intermediate-frequency filters be used in conjunction realize intermediate frequency sorting function, wherein in again and again choosing switch in
Extra port by 50 Ω resistance be connected to ground, and in select again and again switch switching control and a local frequency control code one
It causes.
Refering to Fig. 4.Frequency hopping synthesizer design is brought by the big step width of local oscillator, and local oscillation circuit is by monocycle frequency synthesizer of phase locking, filter
Wave device, amplifier, frequency multiplier, amplifier, filter composition.Output frequency is improved using frequency multiplication mode, widens frequency range, letter
Change phase-locked loop design；It is exported by the way of two sections of component frequency juxtapositions, reduces an IF frequency, improve wideband high-frequency
The realizability of local oscillation circuit and an intermediate-frequency circuit, stability.Amplifier attenuators in series is connected in parallel after three power splitters again
One local oscillation circuit, two local oscillation circuits, three local oscillation circuits.Since monocycle frequency synthesizer of phase locking circuit is simple, technology maturation, performance
Stablize, one local oscillation signal of broadband exports high stability wide interval frequency hopping signal by monocycle frequency synthesizer of phase locking, then passes through frequency multiplication
Mode improves output frequency, widens frequency range；A local oscillator takes frequency up and down folding mode to export simultaneously, and it is defeated to have compressed loop
The output frequency of loop is controlled in the most stable of intermediate region of VCO performance, improves the reliability of circuit by frequency range out.
One local oscillation circuit doubles frequency mode by monocycle and realizes, reduces the design difficulty of loop, improves the steady of circuit
Qualitative and reliability, and improve the phase discriminator for meeting spaceborne product quality grade requirement, number divides the crucial member such as device frequency, VCO
The availability of device.
Two local oscillation circuits export two frequencies using the monocycle frequency synthesizer of phase locking completely the same with a local oscillation circuit can
The fixed point frequency source of control.Three local oscillation circuits add Direct Digital Frequency Synthesizers DDS to realize using monocycle frequency synthesizer of phase locking, ginseng
It examines clock and exports clock signal of the frequent rate LO of fixed point as Direct Digital Frequency Synthesizers DDS by phase-locked loop 3, push
DDS exports the small stepping frequency hopping synthesizer LO3 in narrowband, filters out clock signal through filter, is amplified to suitable level by amplifier, by
The filter of amplifier rear end filters out harmonics frequency component and exports the small stepping frequency hopping synthesizer LO3 in narrowband to third level frequency mixer local oscillator
End.Wherein, the amplifier in circuit before three power splitters adds attenuator effect to be outer for reference to the traction work of circuit in order to be isolated
With improving the anti-interference ability of circuit；The attenuator of three local oscillator branch roads can increase the mutual isolation between three branches, prevent
Only influence each other；The DC power supply that three local oscillation circuits use is isolated using pressure stabilizing measure, and circuit is adopted in topology layout
The mask pattern that small cavity is covered with large cavity improves anti-interference ability to each other, meanwhile, prevent local oscillator from revealing by space,
It influences to receive circuit performance.
Local oscillation circuit includes: the attenuator and its string of the amplifier and cascade amplifier that receive external 50MHz reference clock
Three power splitters of connection, and it is connected in parallel on the attenuator of three roads after three power splitter output ends, the attenuator point of three roads
Not Tong Guo phase-locked loop 1, phase-locked loop 2 be connected with phase-locked loop 3 local oscillation circuit, two local oscillation circuits and three local oscillation circuits；
50MHz reference clock is sent into three power splitter function by attenuator after amplifier amplifies and is divided into three tunnels, respectively through three branch roads
Reference signal after the attenuator decaying of connection as three phaselocked loop local vibration sources of rear class, reference signal are exported through three phaselocked loops
Hold the local oscillation circuit, two local oscillation circuits and three local oscillation circuits that are respectively connected with, export respectively a local oscillation signal LO1-1, LO1-2,
Two local oscillation signal LO2-1, LO2-2 and three local oscillation signal LO3.
Phase-locked loop 1 includes phase discriminator in sequential series, loop filter and voltage controlled oscillator VCO, voltage controlled oscillator VCO
The monocycle frequency synthesizer of phase locking of closed loop is made up of four-divider parallel connection phase discriminator, voltage controlled oscillator VCO is according to frequency
Control code exports local oscillation frequency signal LO1-1', LO1-2' of two broadband frequency hopping sources to a local oscillation circuit.
Phase-locked loop 2 is real using the phase discriminator completely the same with phase-locked loop 1, loop filter and voltage controlled oscillator VCO
Existing monocycle frequency synthesizer of phase locking, reference clock receive frequency control code by phase-locked loop 2, export the frequent rate LO2- of two points
1, LO2-2 is to two local oscillation circuits.
Phase-locked loop 3 and the completely the same phase discriminator in sequential series of phase-locked loop 1, loop filter and voltage controlled oscillator
VCO, voltage controlled oscillator VCO phase discriminator directly in parallel constitute the monocycle frequency synthesizer of phase locking of closed loop, pass through voltage controlled oscillation
Device VCO exports three local oscillation signal LO3.
Reference signal passes through the local oscillator of 1 two broadband frequency hopping sources of output frequency control code LO1-1', LO1-2' of phase-locked loop
Two local oscillation frequency signals of frequency signal, one local oscillation circuit of input sequentially pass through concatenated filter, filter out lock through filter
The a quarter order harmonic components of 1 output frequency of phase loop, then pass through varactor doubler for two local frequencies of LO1-1', LO1-2'
Signal and stepping are extended to frequency multiplication local oscillation signal LO1-1, LO1-2 of two frequency ranges of output after original 2 times, the local oscillator after frequency multiplication
Signal is after post-amplifier saturation amplification, then filter after amplifier filters out all frequency components before frequency multiplication,
Filtering output is sent as local oscillation signal LO1-1, LO1-2 for two frequency ranges to the local oscillator end of first order frequency mixer.
Two local oscillation circuits realize that workflow is such as using the monocycle frequency synthesizer of phase locking completely the same with a local oscillation circuit
Under: reference clock receives frequency control code by phase-locked loop 2, two frequent rates LO2-1, LO2-2 of point is exported, through wave filter
After a quarter order harmonic components for filtering out 2 output frequency of phase ring loop, suitable level is amplified to by amplifier, by rear
The low-pass filter at end filters out local oscillation signal and passes through the harmonic component that amplifier generates, and exports two frequent rates LO2-1, LO2- of point
2 send as two local oscillators to second level frequency mixer local oscillator end.
Three local oscillators add Direct Digital Frequency Synthesizers DDS to realize that workflow is such as using monocycle frequency synthesizer of phase locking
Under: reference clock, which exports the frequent rate LO of fixed point as the clock of Direct Digital Frequency Synthesizers DDS by phase-locked loop 3, to be believed
Number, push DDS to form the small stepping frequency hopping synthesizer in narrowband, three local oscillation signal LO3 of the small stepping frequency hopping synthesizer output output in narrowband are through filtering
Device filters out clock signal, is amplified to suitable level by amplifier, filters out harmonic frequency point by the filter of amplifier rear end
Amount, by three local oscillation signal LO3 to third level frequency mixer local oscillator end.
The foregoing is merely presently preferred embodiments of the present invention, is merely illustrative for the purpose of the present invention, and not restrictive
's.Those skilled in the art understand that it can be carried out in the spirit and scope defined by the claims in the present invention it is many change,
It modifies, is even equivalent, but falling in protection scope of the present invention.
Claims (10)
1. a kind of spaceborne receiver jamproof system in broadband, comprising: rf frequency sorting circuit, IF frequency sorting circuit, low
Intermediate-frequency circuit and local oscillation circuit, it is characterised in that: rf frequency sorting circuit passes through first order frequency mixer series connection IF frequency point
Circuit is selected, IF frequency sorting circuit passes through third by second level frequency mixer two Low Medium Frequency circuits of series connection, two Low Medium Frequency circuits
Grade frequency mixer series connection intermediate frequency amplifies filtering unit, and local oscillation circuit provides local vibration source to above three frequency mixer respectively；The first order is mixed
Broadband rf signal is divided into three frequency sub-band and carries out interference signal filtering respectively by the rf frequency sorting circuit before frequency device, will
Interference signal before one mixing is suppressed to sensitivity level or less；The broadband local oscillator frequency that one frequency mixer is provided according to local oscillation circuit
Rate folds frequency mixing technique using rate is penetrated up and down, obtains double IF frequency；Then it is exported by IF frequency sorting circuit to
Second level frequency mixer is mixed output with the local oscillation signal for entering two frequency mixers and fixes two IF frequency, and function is divided into two-way, all the way shape
It is detectd at senior middle school's frequency wideband radar and receives channel, another way is mixed in output three again and again with the local oscillation signal for entering third level frequency mixer
Rate forms the signal of communication that two-way exports after intermediate frequency function divides filtering unit amplification filtering and detects receipts channel.
2. the spaceborne receiver jamproof system in broadband as described in claim 1, it is characterised in that: first order frequency mixer is corresponding
One local frequency is that the big stepping frequency hopping synthesizer in broadband of two sections of component frequency juxtapositions, output frequency and rf frequency are a pair of in one
It should be related to, broadband rf signal is converted to an intermediate-freuqncy signal of two fixed frequencies by first order frequency mixer；Second level frequency mixer
Corresponding two local frequency is two fixed frequent rates of point, and the selection for exporting frequency point and rf frequency mix in corresponding relationship
Two intermediate-freuqncy signals of fixed point frequency；Corresponding three local frequency of third level frequency mixer is the small stepping frequency hopping synthesizer in narrowband.
3. the spaceborne receiver jamproof system in broadband as described in claim 1, it is characterised in that: rf frequency sorting circuit will
Broadband rf signal is divided into three frequency sub-band, on each frequency sub-band using first order filter in sequential series, low-noise amplifier,
Small stepping adjustable attenuator and second level filter, three frequency sub-band constitute three branches, and three branch circuit parallel connections are identical at two
Frequency choosing switch between, three tributary signals export to the second level frequency choosing switch input terminal, and the second level frequency choosing switch it is defeated
Outlet, which is connected one, inhibits the big stepping variable attenuator interfered, is exported by big stepping controllable attenuator, eliminates three branches
On gain inequality.
4. the spaceborne receiver jamproof system in broadband as claimed in claim 3, it is characterised in that: frequency choosing switch is single-pole three throw
Switch, switch of the radiofrequency signal through first order single-pole three throw are divided into consistent three frequencies of function and select branch, and each frequency selects the branch to be
One frequency sub-band is equipped with small stepping adjustable step attenuator in three sub- band circuitries, between balanced three frequency sub-band due to
The amplitude difference that the amplitude-frequency characteristic of broadband device itself introduces, while improving end when wideband low noise amplifier is cascaded with filter
Mouth standing wave.
5. the spaceborne receiver jamproof system in broadband as described in claim 1, it is characterised in that: IF frequency sorting circuit exists
Rf frequency is divided into high and low two sections at one frequency mixer, RF-1 is Frequency in the one of low-frequency range, RF-2 is high band one
The frequent rate of medium-high frequency, a medium-high frequency frequency RF-2 and a local frequency LO1-2 for high band radio frequency pass through a frequency mixer goes out one
Medium-high frequency frequency IF1-2 is fallen in the one of low-frequency range in Frequency RF-1, low-frequency range one in Frequency RF-1 and one
Vibration frequency LO1-1 by a frequency mixer go out one in the frequent rate IF1-1 of low frequency fall in a medium-high frequency frequency RF-2 of high band,
There is the region that partly overlaps in the corresponding local frequency (LO1-1, LO1-2) of high and low in this way two radio bands, have compressed local oscillator output
Frequency range, wherein the effect of low-pass filter is to prevent a local oscillation signal by mixer leakage to intermediate-frequency channel, by low pass
The subsequent amplifier of filter pushes away saturation.
6. the spaceborne receiver jamproof system in broadband as described in claim 1, it is characterised in that: IF frequency sorting circuit packet
It includes and receives rf frequency sorting circuit the first two frequency sub-band rf frequency RF1 and third frequency sub-band rf frequency RF2, correspondence is defeated
The frequency mixer and its low-pass filter and amplifier in sequential series of an a local frequency LO1-1 and local frequency LO1-2 out,
And the IF frequency of the connection amplifier sorts loop；Wherein, after a frequency mixer is connected with low-pass filter with amplification
Device series connection, amplifier connect single-pole three-throw switch, single-pole three-throw switch parallel connection two intermediate-frequency filters after attenuators in series again
It is parallel to single-pole three-throw switch.
7. the spaceborne receiver jamproof system in broadband as claimed in claim 5, it is characterised in that: frequency mixer mixes low frequency in one
A frequency IF1-1 and medium-high frequency frequency IF1-2, high and low frequency signal IF1-1, IF1-2 pass through low-pass filter, warp in two one
After amplifier amplification, two-way is divided by choosing switch again and again in first in IF frequency sorting loop, passes through the first branch and the
The concatenated filter of two branches is filtered, and exports a Frequency IF1-1 and medium-high frequency frequency IF1-2 in one respectively, in one
Two frequency signals of high and low frequency are respectively after the decaying of the attenuator of respective branch road, then through choosing switch again and again in second according to penetrating
One in frequency rate-adaptive pacemaker IF1-1 or IF1-2.
8. the spaceborne receiver jamproof system in broadband as described in claim 1, which is characterized in that local oscillation circuit includes: to receive
The amplifier of external 50MHz reference clock and the attenuator of cascade amplifier and its concatenated three power splitter, and it is connected in parallel on three
The attenuator of three roads after power splitter output end, the attenuator of three roads pass through phase-locked loop 1, phase-locked loop 2 respectively
Be connected a local oscillation circuit, two local oscillation circuits and three local oscillation circuits with phase-locked loop 3；50MHz reference clock is after amplifier amplifies
Three power splitter function are sent by attenuator and are divided into three tunnels, are used as rear class three after the attenuator decaying of three branch road connections respectively
The reference signal of a phaselocked loop local vibration source, a local oscillation circuit that reference signal is respectively connected with through three phaselocked loop output ends, two
Shake circuit and three local oscillation circuits, exports a local oscillation signal LO1-1, LO1-2, two local oscillation signal LO2-1, LO2-2 and three respectively
Shake signal LO3.
9. the spaceborne receiver jamproof system in broadband as claimed in claim 7, it is characterised in that: reference signal passes through phaselocked loop
The local oscillation frequency signal of 1 two broadband frequency hopping sources of output frequency control code LO1-1', LO1-2' of road, the two of one local oscillation circuit of input
A local oscillation frequency signal sequentially passes through concatenated filter, and a quarter time of 1 output frequency of phase-locked loop is filtered out through filter
Harmonic component, then after two local oscillation frequency signals of LO1-1', LO1-2' and stepping are extended to original 2 times by varactor doubler
Frequency multiplication local oscillation signal LO1-1, LO1-2 of two frequency ranges are exported, the local oscillation signal after frequency multiplication is by post-amplifier saturation amplification
Afterwards, the filter then after amplifier filters out all frequency components before frequency multiplication, and filtering exports one as two frequency ranges
Vibration signal LO1-1, LO1-2 are sent to the local oscillator end of first order frequency mixer.
10. the spaceborne receiver jamproof system in broadband as claimed in claim 7, it is characterised in that: two local oscillation circuits use with
The completely the same monocycle frequency synthesizer of phase locking of one local oscillation circuit realizes that workflow is as follows: reference clock passes through phase-locked loop 2
Receive frequency control code, export two frequent rates LO2-1, LO2-2 of point, filters out 2 output frequency of phase ring loop through wave filter
After a quarter order harmonic components, suitable level is amplified to by amplifier, local oscillator is filtered out by the low-pass filter of rear end
Signal passes through the harmonic component that amplifier generates, and exports two frequent rates LO2-1, LO2-2 of point and send as two local oscillators to the second level
Frequency mixer local oscillator end；Three local oscillators add Direct Digital Frequency Synthesizers DDS to realize using monocycle frequency synthesizer of phase locking, workflow
Journey is as follows: reference clock exports clock of the frequent rate LO of fixed point as Direct Digital Frequency Synthesizers DDS by phase-locked loop 3
Signal pushes DDS to form the small stepping frequency hopping synthesizer in narrowband, and three local oscillation signal LO3 of the small stepping frequency hopping synthesizer output output in narrowband are through filtering
Wave device filters out clock signal, is amplified to suitable level by amplifier, filters out harmonic frequency by the filter of amplifier rear end
Component, by three local oscillation signal LO3 to third level frequency mixer local oscillator end.
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