CN208026861U - L-band Low phase noise frequency source - Google Patents
L-band Low phase noise frequency source Download PDFInfo
- Publication number
- CN208026861U CN208026861U CN201721920576.5U CN201721920576U CN208026861U CN 208026861 U CN208026861 U CN 208026861U CN 201721920576 U CN201721920576 U CN 201721920576U CN 208026861 U CN208026861 U CN 208026861U
- Authority
- CN
- China
- Prior art keywords
- circuit
- frequency
- signal
- module
- signals
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Radar Systems Or Details Thereof (AREA)
Abstract
The utility model discloses a kind of L-band Low phase noise frequency sources, including with reference to source module, clock signal module, local oscillation signal module, control circuit module；It is described to be exported respectively to clock signal module, local oscillation signal module, control circuit module with reference to source module generation 80MHz reference source signals；The clock signal module generates the 20MHz clock signals and power detection signal of radar system for realizing four frequency dividings of reference source signal；The control circuit module includes mainly FPGA control circuit, for controlling local oscillation signal module output frequency signal and receiving reference source signal, power detection signal for judging system failure information.The utility model uses the frequency synthesis mode that direct analog synthesis and direct digital synthesizers are combined, so that frequency source has lower phase noise, higher output spectrum purity, Hopping time interval short, good Spurious suppression performance, higher frequency resolution.
Description
Technical field
The utility model is related to radar system fields, more particularly to a kind of L-band Low phase noise frequency source.
Background technology
L-band low altitude radar in order to obtain the processing gain of coherent signal, the rejection ability and anti-interference ability of strong clutter,
The effective detection for realizing low altitude small target under clutter background, when being converted to the phase noise of frequency source, the purity of frequency spectrum and frequency hopping
Between equal performance there is high requirement.This requires radar system designs to select rational frequency synthesis mode, main at present
Frequency synthesis mode has direct analog synthesis technology, Direct Digital and indirect frequency synthesis technique.
Direct analog synthesis technology (DAS) by frequency dividing, frequency multiplication, is mixed on the basis of the frequency that stabilized oscillator generates
Frequency and filtering, generate required various frequencies, have many advantages, such as that phase noise is low and frequency switching time is short, there are system designs
Complicated, the shortcomings of purity of frequency spectrum is not high, excessive spurious components.
Direct Digital (DDS) is directly to carry out digital sample to reference clock, is passed through with digital processing technology
Digital-to-analogue conversion generates high-resolution frequency signal in real time with continuous phase conversion frequency, has frequency resolution high, becomes
The advantages that frequency time is fast, output phase is continuous, flexible structure, but since higher phase itself is made an uproar, the upper limit of output frequency is low, limit
Use scope is made.
Indirect frequency synthesis technique (PLL) is to utilize the characteristic of phaselocked loop on the basis of the frequency that stabilized oscillator generates
Or phase locking frequency multiplying generates required frequency, has extremely wide frequency range, good Spurious suppression performance, output spectrum purity
Height, it is small the advantages that, but the shortcomings of that there are frequency switching times is longer, and frequency resolution is limited.
Above frequency source synthesis mode cannot fully meet the requirement of L-band low altitude radar system, therefore urgently
A kind of novel L-band Low phase noise frequency source need to be provided to solve the above problems.
Utility model content
That the technical problem to be solved by the utility model is to provide a kind of phase noises is low, spurious reduction is good, frequency hopping when
Between be spaced short L-band Low phase noise frequency source.
In order to solve the above technical problems, the technical solution that the utility model uses is：A kind of L-band Low phase noise is provided
Frequency source, main includes with reference to source module, clock signal module, local oscillation signal module, control circuit module；
It is described with reference to source module generate 80MHz reference source signals export respectively to clock signal module, local oscillation signal module,
Control circuit module；
The clock signal module includes mainly the divide by four circuit being sequentially connected, filter circuit, termination power, power inspection
Slowdown monitoring circuit generates the 20MHz clock signals and power detection signal of radar system for realizing four frequency dividings of reference source signal；
The local oscillation signal module includes a local oscillation signal module, two local oscillation signal modules；The one local oscillation signal module
Include mainly thin frequency marking modular circuit, thick frequency marking modular circuit, mixing amplifying circuit, postpositive disposal circuit, thick frequency marking module electricity
Road output all the way sampled clock signal to thin frequency marking modular circuit and all the way thick frequency standard signal to being mixed amplifying circuit, thin frequency marking mould
The output end of block circuit is connected with the input terminal for being mixed amplifying circuit, is mixed the output end and postpositive disposal circuit phase of amplifying circuit
Even, one local oscillation signal of postpositive disposal circuit output and power detection signal；The two local oscillation signals module is by believing reference source
Number, the mixing of clock signal, frequency dividing, frequency multiplication generate two local oscillation signals and power detection signal；
The control circuit module includes mainly FPGA control circuit, for controlling local oscillation signal module output frequency signal
And reference source signal, power detection signal are received for judging system failure information.
In one preferred embodiment of the utility model, the reference source module includes mainly crystal oscillation signal source and crystal oscillator
The connected power splitter of signal source, crystal oscillation signal source generate 80MHz reference source signals and realize four road work(point by power splitter.
Further, the crystal oscillation signal source uses the antivibration Low phase noise constant-temperature crystal oscillator OXK581D of 80MHz, tool
There is ultralow phase noise, it can be down to -165dBc@1KHz.
In one preferred embodiment of the utility model, the thick frequency marking modular circuit mainly include pectination frequency multiplier circuit,
The first switch filter circuit being connected with pectination frequency multiplier circuit, first switch filter circuit export 1520MHz, 1600MHz and
The DDS sampled clock signals of 1680MHz tri- thick frequency standard signal and 960MHz.The pectination frequency multiplier circuit to reference source signal into
The efficient frequency multiplication of row generates serial frequency spectrum, aforementioned four signal is selected by first switch filter circuit group.
In one preferred embodiment of the utility model, the thin frequency marking modular circuit mainly directly synthesizes electricity including frequency
The input terminal of road, the second switch filter circuit being connected with the direct combiner circuit of frequency, the direct combiner circuit of frequency inputs 80MHz
The DDS sampled clock signals of reference source signal and 960MHz, second switch filter circuit export the thin frequency marking letters of 250~325MHz
Number.
Further, the direct combiner circuit of the frequency uses Direct Digital Frequency Synthesizers DDS.DDS output signals
Frequency is controlled by FPGA control circuit.
In one preferred embodiment of the utility model, the mixing amplifying circuit includes mainly the mixing being connected with each other
Device, amplifier.Be mixed amplifying circuit to thick frequency standard signals of 1520MHz, 1600MHz and 1680MHz tri- of input and 250~
The thin frequency standard signals of 325MHz are mixed and are amplified, and are sent to the processing that postpositive disposal circuit carries out mixed signal.
In one preferred embodiment of the utility model, the postpositive disposal circuit mainly include power-sensing circuit, according to
Secondary connected third switched filter circuit, termination power, power amplification circuit, the output end and power-sensing circuit of termination power
It is connected.Postpositive disposal circuit is filtered to the mixed signal of input and power amplification, output 1775MHz~1975MHz's
One local oscillation signal is to radar system.In addition, filtered mixed frequency signal through overcoupled circuits export all the way signal to power detection
Circuit exports detection signal to FPGA control circuit by power detection.
In one preferred embodiment of the utility model, the two local oscillation signals module includes mainly divide by four circuit, five
Frequency multiplier circuit, the first mixting circuit, the second mixting circuit, third mixting circuit, the 4th mixting circuit, filter amplification circuit, coupling
Close circuit, power-sensing circuit；
The first mixting circuit input 80MHz reference source signals and 20MHz clock signals, output 100MHz first are mixed
Signal is to the second mixting circuit, third mixting circuit；
Second mixting circuit input 80MHz reference source signals and the first mixed frequency signals of 100MHz, output 180MHz the
One mixed frequency signal to divide by four circuit, divide by four circuit exports 45MHz fractional frequency signals；
Third mixting circuit input first mixed frequency signals of 100MHz and 45MHz fractional frequency signals, output 145MHz thirds
Mixed frequency signal；
The fifth harmonic circuit input 80MHz reference source signals, output 400MHz frequency-doubled signals to the 4th mixting circuit, the
Output frequency is two local oscillation signals of 545MHz after the filtered amplifying circuit of output signal and termination power of four mixting circuits,
Termination power exports the power detection that two local oscillation signals all the way carry out signal to power-sensing circuit simultaneously.
The utility model has the beneficial effects that：
(1) the utility model uses the frequency synthesis mode that direct analog synthesis and direct digital synthesizers are combined, comprehensive
The advantages of the two so that frequency source has lower phase noise, higher output spectrum purity, Hopping time interval short, good
The advantages that good Spurious suppression performance, higher frequency resolution, provides the signal of low phase noise for radar, improves radar system
The improvement factor of system promotes the low altitude small target detectivity of radar；
(2) the utility model uses modularized design, and system structure is relatively easy, improves system reliability；
(3) the utility model uses signal self-test survey technology, and output clock, local oscillator can be realized by FPGA control circuit
The monitoring of signal power effectively judges the fault message of system, reduces the maintenance difficulty of system.
Description of the drawings
Fig. 1 is the functional block diagram of one preferred embodiment of the utility model L-band Low phase noise frequency source；
Fig. 2 is the structure diagram of the L-band Low phase noise frequency source.
Specific implementation mode
The preferred embodiment of the utility model is described in detail below in conjunction with the accompanying drawings, so that the advantages of the utility model
It can be easier to be readily appreciated by one skilled in the art with feature, it is apparent clear to be made to the scope of protection of the utility model
Define.
It please refers to Fig.1 and Fig. 2, the utility model embodiment includes：
A kind of L-band Low phase noise frequency source, main includes with reference to source module, clock signal module, local oscillation signal module, control
Circuit module processed.
The reference source module includes mainly crystal oscillation signal source, power splitter, and crystal oscillation signal source generates 80MHz reference source signals
Four road work(point are realized by power splitter, are exported respectively to clock signal module, local oscillation signal module, control circuit module, are generated
The 20MHz clock signals of radar system, the sampling clock of local oscillation signal and control module.
Preferably, the crystal oscillation signal source uses the antivibration Low phase noise constant-temperature crystal oscillator OXK581D of 80MHz, has
Ultralow phase noise, can be down to -165dBc@1KHz.
The clock signal module includes mainly divide by four circuit, filter circuit, termination power, power-sensing circuit, ginseng
It examines source signal and carries out four frequency dividings by divide by four circuit, export two paths of signals, exported all the way to two local oscillators for 20MHz clock signals
Signaling module, the filtered circuit of four fractional frequency signal of another way are filtered, and two paths of signals is generated using termination power, wherein
Signal detects signal through power-sensing circuit output power all the way, and another way generates the 20MHz clock signals of radar system.
The local oscillation signal module includes a local oscillation signal module, two local oscillation signal modules.
The one local oscillation signal module mainly include thin frequency marking modular circuit, thick frequency marking modular circuit, mixing amplifying circuit,
Postpositive disposal circuit, thick frequency marking modular circuit output sampled clock signal to thin frequency marking modular circuit and all the way thick frequency marking letter all the way
Number it is connected to mixing amplifying circuit, the output end of thin frequency marking modular circuit and the input terminal for be mixed amplifying circuit, mixing is amplified electric
The output end on road is connected with postpositive disposal circuit, one local oscillation signal of postpositive disposal circuit output and power detection signal.Described one
Local oscillation signal module generates thin frequency standard signal and thick frequency standard signal respectively by direct digital synthesizers and direct analog synthesis, passes through
It is mixed mixing and amplification of the amplifying circuit to thin frequency standard signal and thick frequency standard signal, using the filtering of postpositive disposal module, coupling
It closes, power amplification, output local oscillation signal is sent to radar system, and the Up/Down Conversion for the transmitting receiving channel of radar provides a local oscillator
Signal, while output power detects signal to control circuit module.
Each circuit structure and principle of the local oscillation signal module are described in detail below.
The first switch filter that the thick frequency marking modular circuit mainly includes pectination frequency multiplier circuit, is connected with pectination frequency multiplier circuit
Wave circuit.First switch filter circuit exports the thick frequency standard signals of 1520MHz, 1600MHz and 1680MHz tri- to mixing amplification electricity
The DDS sampled clock signals of road and 960MHz are to DDS.The pectination frequency multiplier circuit using snap-off diode to reference source signal into
The efficient frequency multiplication of row generates serial frequency spectrum, aforementioned four signal is selected by first switch filter circuit group.
The thin frequency marking modular circuit mainly include the direct combiner circuit of frequency, be connected with the direct combiner circuit of frequency the
Two switched filter circuits.The DDS sampled clock signals of the direct combiner circuit input 80MHz reference source signals of frequency and 960MHz,
According to the signal that FPGA control circuit exports, the direct combiner circuit of control frequency generates the thin frequency standard signal of corresponding frequencies, passes through
The thin frequency standard signals of 250~325MHz are exported after second switch filter circuit.
Further, the direct combiner circuit of the frequency uses Direct Digital Frequency Synthesizers DDS, specifically uses model
The DDS of AD9912, is 14 Direct Digital Frequency Synthesizers, and output frequency can reach 400MHz, support 48bit's
Frequency word, frequency resolution has the characteristics that high-precision, Low phase noise up to 4 μ Hz, for exporting the frequency signal of 275MHz,
It mutually makes an uproar and is better than -133dBc@1KHz.
The mixing amplifying circuit includes mainly the frequency mixer being connected with each other, amplifier.Amplifying circuit is mixed to input
The thick frequency standard signals of 1520MHz, 1600MHz and 1680MHz tri- and the thin frequency standard signals of 250~325MHz are mixed and are amplified,
And it is sent to the processing that postpositive disposal circuit carries out mixed signal.
The postpositive disposal circuit is mainly including power-sensing circuit, the third switched filter circuit being sequentially connected, coupling
The output end of circuit, power amplification circuit, termination power is connected with power-sensing circuit.Mixing of the postpositive disposal circuit to input
Signal is filtered and power amplification afterwards, exports a local oscillation signal of 1775MHz~1975MHz to radar system.In addition, filtering
Mixed frequency signal afterwards exports signal all the way through overcoupled circuits and exports detection signal extremely by power detection to power-sensing circuit
FPGA control circuit.
By above-mentioned analysis, thick frequency standard signal maximum frequency multiplication number is 1680MHz/80MHz=21, reference source signal noise
About 20log21=26.5dB considers that the additional noise of link is about 5dB, obtain thick frequency standard signal phase noise about-
133.5dBc@1KHz；The phase noise of thin frequency standard signal is about -133dBc@1KHz；Thick frequency standard signal and the mixing of thin frequency standard signal
A local oscillation signal is formed, mixing synthesizes the superposition of the two signal, considers the additional noise (about 5dB) of circuit, exports a local oscillator
The phase noise of signal is less than -125dBc@1KHz.
The two local oscillation signals module to the mixing of reference source signal, clock signal, frequency dividing, frequency multiplication by generating two local oscillators
Signal, and detect signal through overcoupled circuits, power-sensing circuit output power.
Specifically, the two local oscillation signals module mainly include divide by four circuit, fifth harmonic circuit, the first mixting circuit,
Second mixting circuit, third mixting circuit, the 4th mixting circuit, filter amplification circuit.First mixting circuit inputs 80MHz
Reference source signal and 20MHz clock signals, output the first mixed frequency signals of 100MHz to the second mixting circuit, third mixting circuit；
The second mixting circuit input 80MHz reference source signals and the first mixed frequency signals of 100MHz, the output mixing letters of 180MHz first
Number to divide by four circuit, divide by four circuit exports 45MHz fractional frequency signals；The third mixting circuit input 100MHz first is mixed
Signal and 45MHz fractional frequency signals, output 145MHz third mixed frequency signals；The fifth harmonic circuit input 80MHz reference source signals,
400MHz frequency-doubled signals are exported to the 4th mixting circuit, the filtered amplifying circuit of output signal of the 4th mixting circuit carries out letter
After number filtering and power amplification, output frequency is two local oscillation signals of 545MHz to radar system, be radar transmitting receive it is logical
The Up/Down Conversion in road provides local oscillation signal, and termination power exports two local oscillation signals all the way and carries out signal to power-sensing circuit simultaneously
Power detection.
The control circuit module includes mainly FPGA control circuit, and the sampling clock of FPGA control circuit is 80MHz, and
It receives and controls signal from the aobvious FREQUENCY CONTROL controlled of radar terminal, frequency agility, control DDS generates the thin frequency marking letter of corresponding frequencies
Number, while by the power detection signal of communication interface reception clock signal module, local oscillator module, can effectively judge system
Fault message, and output switch control signal is to first switch filter circuit, second switch filter circuit, third switch filtering
Device controls the frequency-selecting output of switch filter.
Above-mentioned each circuit is custom circuit, and particular circuit configurations repeat no more.
Radar Waveform Generator output frequency is the intermediate-freuqncy signal of 30MHz, is generated with the L-band Low phase noise frequency source
Two local oscillation signals are mixed to 575MHz, then be mixed with a local oscillation signal of 1775MHz~1975MHz generate 1200MHz~
The L-band radar radiofrequency signal of 1400MHz.
The technical indicator that the L-band Low phase noise frequency source of the utility model reaches is as follows：
One local oscillation signal：L-band 1775MHz~1975MHz；
Two local oscillation signals：545MHz；
Clock signal：20MHz；
Frequency interval：41；
Hopping time interval：2μs；
Mutually make an uproar：Better than -125dBc@1KHz；
Spurious reduction：≥70dBc；
Harmonics restraint：≥50dBc.
The utility model uses the frequency synthesis mode that direct analog synthesis and direct digital synthesizers are combined, both comprehensive
The advantages of so that frequency source has lower phase noise, higher output spectrum purity, Hopping time interval short, good
The advantages that Spurious suppression performance, higher frequency resolution, provides the signal of low phase noise for radar, improves radar system
Improvement factor promotes the low altitude small target detectivity of radar；Using modularized design, system structure is relatively easy, improves
System reliability；In addition the utility model use signal self-test survey technology, by FPGA control circuit can realize output clock,
The monitoring of local oscillation signal effectively judges the failure of system, reduces system maintenance difficulty.
The above description is only the embodiments of the present invention, and it does not limit the scope of the patent of the present invention, every
Equivalent structure or equivalent flow shift made based on the specification and figures of the utility model, is applied directly or indirectly in
Other related technical areas are equally included in the patent within the scope of the utility model.
Claims (9)
1. a kind of L-band Low phase noise frequency source, which is characterized in that main includes with reference to source module, clock signal module, local oscillator letter
Number module, control circuit module；
It is described to be exported respectively to clock signal module, local oscillation signal module, control with reference to source module generation 80MHz reference source signals
Circuit module；
The clock signal module includes mainly the divide by four circuit being sequentially connected, filter circuit, termination power, power detection electricity
Road generates the 20MHz clock signals and power detection signal of radar system for realizing four frequency dividings of reference source signal；
The local oscillation signal module includes a local oscillation signal module, two local oscillation signal modules；The one local oscillation signal module is main
Including thin frequency marking modular circuit, thick frequency marking modular circuit, mixing amplifying circuit, postpositive disposal circuit, thick frequency marking modular circuit is defeated
Go out all the way sampled clock signal to thin frequency marking modular circuit and all the way thick frequency standard signal to being mixed amplifying circuit, thin frequency marking module electricity
The output end on road is connected with the input terminal for being mixed amplifying circuit, and the output end for being mixed amplifying circuit is connected with postpositive disposal circuit,
One local oscillation signal of postpositive disposal circuit output and power detection signal；The two local oscillation signals module by reference source signal,
The mixing of clock signal, frequency dividing, frequency multiplication generate two local oscillation signals and power detection signal；
The control circuit module includes mainly FPGA control circuit, for controlling local oscillation signal module output frequency signal and connecing
Reference source signal, power detection signal are received for judging system failure information.
2. L-band Low phase noise frequency source according to claim 1, which is characterized in that described to include mainly with reference to source module
Crystal oscillation signal source, the power splitter being connected with crystal oscillation signal source, it is real by power splitter that crystal oscillation signal source generates 80MHz reference source signals
Existing four road work(point.
3. L-band Low phase noise frequency source according to claim 2, which is characterized in that the crystal oscillation signal source uses 80MHz
Antivibration Low phase noise constant-temperature crystal oscillator OXK581D.
4. L-band Low phase noise frequency source according to claim 1, which is characterized in that the thick frequency marking modular circuit is main
Including pectination frequency multiplier circuit, the first switch filter circuit being connected with pectination frequency multiplier circuit, the output of first switch filter circuit
The DDS sampled clock signals of 1520MHz, 1600MHz and 1680MHz tri- thick frequency standard signal and 960MHz.
5. L-band Low phase noise frequency source according to claim 1, which is characterized in that the thin frequency marking modular circuit is main
Including the direct combiner circuit of frequency, the second switch filter circuit being connected with the direct combiner circuit of frequency, frequency directly synthesizes electricity
The input terminal input 80MHz reference source signals on road and the DDS sampled clock signals of 960MHz, the output of second switch filter circuit
The thin frequency standard signals of 250~325MHz.
6. L-band Low phase noise frequency source according to claim 5, which is characterized in that the direct combiner circuit of frequency is adopted
With Direct Digital Frequency Synthesizers DDS.
7. L-band Low phase noise frequency source according to claim 1, which is characterized in that the mixing amplifying circuit mainly wraps
Include frequency mixer, the amplifier of interconnection.
8. L-band Low phase noise frequency source according to claim 1, which is characterized in that the postpositive disposal circuit mainly wraps
Third switched filter circuit, termination power, the power amplification circuit for including power-sensing circuit, being sequentially connected, termination power it is defeated
Outlet is connected with power-sensing circuit.
9. L-band Low phase noise frequency source according to claim 1, which is characterized in that the two local oscillation signals module is main
Including divide by four circuit, fifth harmonic circuit, the first mixting circuit, the second mixting circuit, third mixting circuit, the 4th mixing electricity
Road, filter amplification circuit, termination power, power-sensing circuit；
The first mixting circuit input 80MHz reference source signals and 20MHz clock signals, output the first mixed frequency signals of 100MHz
To the second mixting circuit, third mixting circuit；
The second mixting circuit input 80MHz reference source signals and the first mixed frequency signals of 100MHz, output 180MHz first are mixed
Frequency signal to divide by four circuit, divide by four circuit exports 45MHz fractional frequency signals；
Third mixting circuit input first mixed frequency signals of 100MHz and 45MHz fractional frequency signals, output 145MHz thirds mixing
Signal；
The fifth harmonic circuit input 80MHz reference source signals, output 400MHz frequency-doubled signals to the 4th mixting circuit, the 4th is mixed
Output frequency is two local oscillation signals of 545MHz, coupling after the filtered amplifying circuit of output signal and termination power of frequency circuit
Circuit exports the detection that two local oscillation signals all the way carry out signal to the power-sensing circuit simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721920576.5U CN208026861U (en) | 2017-12-29 | 2017-12-29 | L-band Low phase noise frequency source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721920576.5U CN208026861U (en) | 2017-12-29 | 2017-12-29 | L-band Low phase noise frequency source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208026861U true CN208026861U (en) | 2018-10-30 |
Family
ID=63901630
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721920576.5U Expired - Fee Related CN208026861U (en) | 2017-12-29 | 2017-12-29 | L-band Low phase noise frequency source |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208026861U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107976653A (en) * | 2017-12-29 | 2018-05-01 | 皖西学院 | L-band Low phase noise frequency source |
| CN109407057A (en) * | 2018-11-29 | 2019-03-01 | 武汉大学 | A kind of signal source of S-band wave observation radar |
-
2017
- 2017-12-29 CN CN201721920576.5U patent/CN208026861U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107976653A (en) * | 2017-12-29 | 2018-05-01 | 皖西学院 | L-band Low phase noise frequency source |
| CN107976653B (en) * | 2017-12-29 | 2023-08-08 | 皖西学院 | L-band low-phase noise frequency source |
| CN109407057A (en) * | 2018-11-29 | 2019-03-01 | 武汉大学 | A kind of signal source of S-band wave observation radar |
| CN109407057B (en) * | 2018-11-29 | 2023-08-29 | 武汉大学 | Signal source of S-band wave-measuring radar |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107976653A (en) | L-band Low phase noise frequency source | |
| CN105187060B (en) | The phase-locked loop circuit and its implementation of a kind of low phase noise | |
| CN208026861U (en) | L-band Low phase noise frequency source | |
| CN108333958B (en) | Multiplexing general aviation simulator | |
| US6081226A (en) | Multi-mode radar exciter | |
| CN109286373B (en) | Ku frequency band down converter | |
| CN106772292A (en) | One kind test calibration measure equipment calibration source | |
| CN106888015B (en) | Broadband frequency agility millimeter wave frequency synthesizer | |
| CN209105177U (en) | A kind of number TR component | |
| CN209765036U (en) | Complex radar signal simulator | |
| CN109412591B (en) | X-waveband fine-stepping frequency synthesis generation method and system | |
| CN215818135U (en) | Frequency hopping frequency source and communication device | |
| CN103297044B (en) | Microwave signal source and method for producing microwave signal | |
| CN202334495U (en) | X frequency range small step forward frequency synthesizer for aerospace measurement and control | |
| CN211239828U (en) | X-waveband 10Hz stepping low-stray-frequency source | |
| CN205176262U (en) | S wave band radar system frequency source | |
| CN107017879B (en) | System and method for subcarrier decoding of high-frequency signal with subcarrier modulation | |
| CN212905421U (en) | Portable target simulator microwave system | |
| CN209030193U (en) | A kind of microwave source and solid state transmitter component | |
| CN216959886U (en) | Interference source generating device and microwave interference source | |
| CN211606515U (en) | Digital frequency synthesizer | |
| CN105334500B (en) | A kind of S-band radar system frequency source | |
| CN202535309U (en) | Small airborne frequency up-conversion system frequency conversion channel circuit | |
| CN113740809A (en) | Multi-channel extensible broadband excitation generation device and method | |
| CN215601287U (en) | Broadband low-stray millimeter wave direct synthesis source circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20181030 Termination date: 20191229 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |