CN108400785A - A kind of miniaturization microwave broadband victory frequency Up/Down Conversion system and calibration method - Google Patents
A kind of miniaturization microwave broadband victory frequency Up/Down Conversion system and calibration method Download PDFInfo
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/08—Details of the phase-locked loop
- H03L7/085—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/08—Details of the phase-locked loop
- H03L7/085—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
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- H—ELECTRICITY
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- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
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Abstract
The invention discloses a kind of miniaturization microwave broadband victory frequency Up/Down Conversion system and calibration method, which includes the up-conversion passage and down coversion channel using identical local oscillation signal；Further include that redundancy calibration all the way is mixed channel, the redundancy calibration mixing channel is mixed using the up-conversion passage local oscillation signal that either down coversion channel uses using in directional coupler and switching network access up-conversion passage and the Up/Down Conversion system of down coversion channel composition and realizes up-conversion or down coversion.This method, by detecting offset together, calculates using redundancy calibration mixing channel and obtains the phase pushing figure of up-converter circuit and lower frequency changer circuit under current state.Present invention incremental redundancy calibration mixing channel in Ku band broadband frequency agility Up/Down Conversion systems, may be implemented Up/Down Conversion self-calibration function.
Description
Technical field
The present invention relates to communication frequency conversion system field, more particularly to a kind of one miniaturization microwave broadband victory frequency Up/Down Conversion system
System and calibration method.
Background technology
Ku band broadband frequency agility Up/Down Conversion systems are a kind of Up/Down Conversion devices, for penetrating intermediate-freuqncy signal and Ku wave bands
Frequency signal carries out frequency conversion, and since conversion time is short, (it is micro- that typical time period is less than 100 to agile frequency source (local oscillator)
Second), thus effectively anti-can intercept and capture, anti-interference deception, there is outstanding electronic warfare performance.Up/Down Conversion device is radar detection
With the core equipment in satellite communication system, performance directly affects the tactical qualities performance of system.
It is level-one frequency conversion that typical Up/Down Conversion device, which uses superhet conversion architecture, simplest superhet frequency conversion, even if
With a local oscillator (fLO) it is used as frequency source, the intermediate-freuqncy signal of low frequency is moved to the radio frequency band of high frequency, rf frequency
fRF=fLO+fIF(low local oscillator pattern) or fRF=fLO-fIF(high local oscillator pattern).Radio frequency is inserted into the suitable position of signal link to drive
Dynamic amplifier and filter, it is ensured that the amplitude and quality of signal and the inhibition to out of band signal.In more complicated frequency conversion application
In (such as broad band radio frequency applications), frequently with double conversion as shown in Figure 1, or more high order variable mode.Have two in Fig. 1
A local oscillator, the f that local frequency isLO1Local oscillator 1 and the local frequency f that isLO2Local oscillator 2, if being all made of low local oscillator
Pattern, an IF frequency are expressed as：fIF1=fLO1+fIF, rf frequency is expressed as：fRF=fLO1+fLO2+fIF.Due to an intermediate frequency
(fIF1) compared to IF frequency (fIF) higher, in the local oscillator leakage f that double conversion generatesLO2With image frequency frequency distance fmir=
fLO2-fIF1Apart from radiofrequency signal fRFFarther out, thus be conducive to filter out using radio-frequency filter.The low-noise amplifier of receives link
Placement forward as possible is answered, receiver total noise of centrifuge coefficient is advantageously reduced.For reduce system debug difficulty and development ＆ production at
This, under the premise of not influencing noise coefficient, gain should be configured as possible in an intermediate frequency or intermediate-frequency band.Link median filter should be able to
Effectively filter out out-of-band interference signal, such as image frequency frequency, local oscillator leakage and nature or jam signal.
Local oscillator (frequency source) is the core component of Up/Down Conversion device, and good frequency source should have higher frequency
Stability, low spuious, low harmonic emissions and low phase noise, agile frequency source also require shorter conversion time.Frequently
There are mainly three types of synthesis modes in rate source：Direct synthesis mode, direct digital synthesizers (DDS) and indirect synthesis mode (phaselocked loop
PLL).Direct synthesis mode has optimal phase noise and spurious performance, but circuit realization is complex, has higher body
Product, power consumption and cost, frequency conversion speed is quickly but frequency resolution is insufficient.Direct Digital Synthesis-DDS frequency conversion speed same time-frequency quickly
Rate resolution ratio is very high (typical case can reach the even more fine frequency resolution of 1Hz magnitudes), the disadvantage is that its spurious performance is bad,
Simultaneously because digital circuit performance limits exportable frequency, not high (DDS for the maximum clock frequency that industry can input at present is
AD9914, for clock frequency up to 3.5GHz, exportable highest frequency is 1.4GHz), the local oscillator even higher to generate X-band
Signal source needs to carry out frequency spectrum shift using frequency conversion or frequency multiplication mode.Indirect synthesis mode is synthesized using locking phase, loop filtering
Device can inhibit the reference source outside band spuious, thus have lower spurious performance, since phase discriminator and loop are made an uproar bottom and sudden strain of a muscle
The bright higher influence in bottom of making an uproar causes its phase noise poor in loop bandwidth, while cycle of phase-locked loop locking time usually exists
100 musec orders cannot be satisfied the frequency hopping speed of agile frequency source.
The prior art does not have Up/Down Conversion self-calibration function, to because of temperature change or the circuit aging amplitude offset brought
The system performance variation brought with phase offset is helpless, can only safeguard completion system calibration by regularly going back to factory.
Invention content
Do not have Up/Down Conversion self-calibration function for existing technologies, to because of temperature change or the circuit aging amplitude brought
The system performance variation that offset and phase offset are brought is helpless, can only safeguard completion system calibration institute by regularly going back to factory
The deficiency brought provides a kind of miniaturization Ku band broadbands frequency agility Up/Down Conversion system and calibration method.
The present invention be realize above technology require and the technical solution adopted is that：A kind of prompt frequency of miniaturization microwave broadband is upper and lower
Frequency conversion system, including use up-conversion passage and the down coversion channel of identical local oscillation signal；Further include that redundancy calibration all the way is mixed
Frequency channel, redundancy calibration mixing channel are logical using directional coupler and switching network access up-conversion passage and down coversion
In the Up/Down Conversion system of road composition, it is mixed using the local oscillation signal that the up-conversion passage or down coversion channel use real
Existing up-conversion or down coversion.
Present invention incremental redundancy calibration mixing channel in Ku band broadband frequency agility Up/Down Conversion systems, may be implemented
Down coversion self-calibration function.
Further, in above-mentioned miniaturization microwave broadband victory frequency Up/Down Conversion system：The up-conversion passage is under
Frequency conversion channel is double superheterodyne frequency conversion channel, and redundancy calibration mixing channel is to use the up-conversion passage
The two-stage of two local oscillation signals used with down coversion channel is mixed channel.
Further, in above-mentioned miniaturization microwave broadband victory frequency Up/Down Conversion system：The redundancy calibration mixing is logical
In road, it is additionally provided with the bandpass filter of the frequency centered on IF signal frequency.
Further, in above-mentioned miniaturization microwave broadband victory frequency Up/Down Conversion system：In the down coversion channel, connect
Enter low noise filter after receiving radiofrequency signal, the low noise device is the gallium nitride low-noise amplifier of adjustable gain.
Further, in above-mentioned miniaturization microwave broadband victory frequency Up/Down Conversion system：In the down coversion channel, connect
Enter low noise filter after receiving radiofrequency signal, the low noise device is large dynamic range low-noise amplifier；The Larger Dynamic
Range low-noise amplifier includes rf diode wave detector and gain-adjustable low-noise amplifier.
Further, in above-mentioned miniaturization microwave broadband victory frequency Up/Down Conversion system：The frequency source packet of the local oscillator
Include snap-off diode harmonic oscillator, DDS direct digital synthesisers and mixing and filtering network；
The output of the crystal oscillator of 100MHz connects the input terminal of snap-off diode harmonic oscillator, snap-off diode harmonic oscillator
The bandpass filter that centre frequency is 2.4GHz, 13.7GHz, 14.2GHz, 14.7GHz, 15.2GHz, center are passed through in output respectively
Frequency is that the output of the bandpass filter of 2.4GHz connects DDS direct digital synthesisers, and the output of DDS direct digital synthesisers is passed through
300-800MHz bounce frequency filters filtering after with respectively with centre frequency be 13.7GHz, 14.2GHz, 14.7GHz, 15.2GHz
The output of bandpass filter be mixed to form mixing and filtering network.
The present invention also provides a kind of calibration method according to above-mentioned miniaturization microwave broadband victory frequency Up/Down Conversion system, packets
Include following steps：
1) up-conversion passage and redundancy calibration mixing channel are enabled, and RF switch network settings are formed for proper states
Intermediate frequency circuit can be tested to obtain the phase pushing figure in the circuit using processing circuitry of intermediate frequency：
WhereinFor 1 phase pushing figure of calibration steps,For up-conversion passage phase pushing figure,For calibration
Channel phases deviant；
2) up-conversion passage and down coversion channel are enabled, and is that proper states form intermediate frequency time by RF switch network settings
Road can be tested to obtain the phase pushing figure in the circuit using processing circuitry of intermediate frequency：
WhereinFor 2 phase pushing figure of calibration steps,For down coversion channel phases deviant；
3) calibrated channel and down coversion channel are enabled, and is that proper states form intermediate frequency time by RF switch network settings
Road can be tested to obtain the phase pushing figure in the circuit using processing circuitry of intermediate frequency：
WhereinFor 3 phase pushing figure of calibration steps；
4) (1) is solved equation, (2), (3) can calculateWithObtain up-converter circuit under current state
With the phase pushing figure of lower frequency changer circuit.
Below with reference to drawings and examples, the present invention is described in detail.
Description of the drawings
Fig. 1 is miniaturization microwave broadband victory frequency Up/Down Conversion service system in the prior art.
Fig. 2 is that the embodiment of the present invention 1 minimizes Ku band broadband frequency agility Up/Down Conversion systems.
Fig. 3 is that the embodiment of the present invention 1 minimizes Larger Dynamic model in Ku band broadband frequency agility Up/Down Conversion system embodiments
Enclose low-noise amplifier design frame chart.
Fig. 4 is that the embodiment of the present invention 1 minimizes Ku wave bands victory in Ku band broadband frequency agility Up/Down Conversion system embodiments
Frequency source design frame chart.
Fig. 5 is that the embodiment of the present invention 1 minimizes Ku band broadband frequency agility Up/Down Conversion system standards school first step signal
Flow chart.
Fig. 6 is that the embodiment of the present invention 1 minimizes Ku band broadband frequency agility Up/Down Conversion system standards school second step signal
Flow chart.
Fig. 7 is that the embodiment of the present invention 1 minimizes Ku band broadband frequency agility Up/Down Conversion system standards school three step signal
Flow chart.
Specific implementation mode
The present embodiment is to increase redundancy calibration mixing channel all the way on the basis of a kind of conventional superhet variable-frequency solutions, should
Channel using passive frequency mixer implement double conversion, do not have directionality, both can with up-conversion can also down coversion, using orientation
Coupler and switching network access in the mixing channel in former frequency changer circuit, as shown in Figure 2.It is with Ku wave bands in the present embodiment
Example, is a kind of miniaturization Ku band broadbands frequency agility Up/Down Conversion system, but in practice, the microwave frequency conversion system of other wave bands
In also all samples can be practical, such as S-band, pattern-band etc..
In the present embodiment, the superhet up-conversion passage one of up-conversion passage and the double conversion of the prior art in Fig. 1
Cause, as shown in Figure 2 by emission medium-frequency, after intermediate-frequency filter, carry out with local oscillator 1 being the level-one up-conversion of mixing frequencies
After, it needs after an intermediate-frequency filter filters, after amplifying using intermediate frequency driving amplifier, enters two level upconverter
It after frequency conversion, then is filtered by radio-frequency filter, followed by power amplifier is amplified signal, after the first RF switch, output.Lower change
Frequency channel is also consistent with the superhet down coversion channel of current double conversion, as shown in Fig. 2, from the radiofrequency signal received
It after the first RF switch, after being amplified by low noise amplifier, is filtered by radio-frequency filter, then by being mixed, filtering and amplifying twice
Intermediate-freuqncy signal is formed afterwards to receive.
Unlike the prior art, in the present embodiment, redundancy calibration mixing channel all the way is increased, 4 radio frequencies are utilized
Redundancy is calibrated mixing channel and is added to the superhet of double conversion as shown in Figure 1 or more by switch and two RF couplers
In frequency conversion system.
Redundancy calibration mixing channel is also double conversion as upper and lower frequency conversion channel, that is, logical using upper and lower frequency conversion
Identical local oscillation signal is mixed twice in road.Double conversion is implemented in the channel using passive frequency mixer, does not have directionality,
Both can with up-conversion can also down coversion, which is accessed by former frequency changer circuit using directional coupler and switching network
In.
The design key of Larger Dynamic range receiver is that its processing mode and tolerance to big signal, big signal are defeated
It is fashionable distortion to be generated by compression, low-noise amplifier can not be lost.The present embodiment selects the gallium nitride of adjustable gain low
Noise amplifier, the amplifier gain are continuously adjusted within the scope of -30~20dB, and output 1dB compression points are 15dBm, low gain
When tolerable 30dBm radio-frequency powers do not damage, noise coefficient 2dB, it is the amplifier in the case of -110dBm that minimum, which receives signal,
Dynamic range be up to 140dB, remote super industry conventional levels.
Large dynamic range low-noise Amplifier Design is as shown in figure 3, Primary Component is rf diode wave detector and gain
Adjustable low-noise amplifier.Diode monitors current radio frequency input power, output detecting circuit (and appropriately processed rear) in real time
For controlling amplifier gain.The present invention uses feedforward gain control mode, detection and Gain tuning reaction time to be less than 10ns,
Big signal will not damage amplifier.Signal as shown in Figure 3 is inputted from left end, and part energy is sent to detection through coupler
Device, main channel signal amplifies through amplifier to be exported.Wave detector detects the DC voltage proportional to signal power, the DC voltage
The gain of output DC voltage control amplifier is handled through gain control module, therefore generates the gain control to main channel signal
System.
The present embodiment combines two kinds of frequency combining methods of directly synthesis and digit synthesis and realizes Ku wave band 2GHz bandwidth
Agile frequency source.As shown in figure 4, frequency source core is by snap-off diode harmonic oscillator, DDS direct digital synthesizers and mixing
Filter network three parts form.
Snap-off diode harmonic oscillator can generate each harmonic with reference to crystal oscillator, be filtered using suitable narrow-band bandpass
Device can take out the frequency of needs, reference frequency sources of the 2.4GHz that the present invention takes out as DDS, taking-up
13.7GHz, 14.2GHz, 14.7GHz, 15.2GHz are not shown in block diagrams as mixing local oscillator, the devices such as amplitude amplification.
DDS direct digital synthesizers generate 300MHz~800MHz Sweep Source, due to DDS band spurious very well (about-
90dBc) and band stray is poor (- 50dBc), therefore the present invention is in order to ensure in certain bandwidth to have good spuious level
(- 80dBc) inserts narrowband bounce frequency filter (about 3MHz bandwidth) in DDS output ends, to band outside it is spuious inhibit, can
Ensure spuious horizontal less than -80dBc within the scope of 300MHz~800MHz.The mixing of rear class and amplifying circuit and switching network
The spuious level of signal will not be deteriorated, therefore the spuious of local oscillator output of final Ku wave bands can also reach -80dBc.
It mutually makes an uproar on reachable -165dBc@1kHz, the 15.2GHz Harmonic Theory of mutually making an uproar of 100MHz crystal oscillators and deteriorates 44dB, consider rank
Jump diode itself deteriorates 2dB to mutually making an uproar, and 15.2GHz phases are made an uproar reachable -119dBc@1kHz.The phase noise of DDS outputs depends on
The last phase of chip itself is made an uproar, and the last phase of AD9915 is made an uproar about -128dBc@1kHz, therefore the local oscillator after being mixed with 15.2GHz
2 phase noise depends on the poor side that mutually makes an uproar, i.e. -119dBc@1kHz.
The fast switching speed of frequency source depends on the fast switching speed of DDS, and AD9915 switching times are less than 100ns.Frequency source frequency
Rate resolution ratio depends on the frequency resolution of DDS, and AD9915 frequency resolutions are 135pHz.
The prior art does not have Up/Down Conversion self-calibration function, to because of temperature change or the circuit aging amplitude offset brought
The system performance variation brought with phase offset is helpless, can only safeguard completion system calibration by regularly going back to factory.And this
Redundancy calibrated channel is added in embodiment, can be calibrated in real time to the amplitude offset of system and phase offset, to because of temperature and
The circuit aging amplitude offset brought and phase offset can greatly ensure the property of time system life-cycle with real-time compensation
Energy.
The prior art mostly uses the low-noise amplifier of height output 1dB compression points or automatic gain control amplifier is realized greatly
Dynamic range receiver, but the former power consumption is often larger, is unfavorable for reducing Overall Power Consumption and system radiating, and the latter does not often have
Have low-noise performance, the small signal for influencing reception system receives, while automatic growth control belongs to feedback control, the reaction time compared with
Long, the typical feedback time is 10 microseconds, it is difficult to be made a response in time to current signal magnitude.And the present embodiment this partly be use
Wave detector feedforward control low-noise amplifier realizes have very high dynamic range and big signal reaction speed, can meet communication
With a wide range of dynamic range requirement of radar system.
The indices for the frequency source that the prior art is realized, such as phase noise, spuious, frequency resolution and frequency conversion speed
It usually holds each other back, it is difficult to which design obtains all very excellent frequency source of indices.The present invention directly synthesized using frequency and
Digital direct is bonded into the mode being combined, direct using the low phase noise and low spurious advantage and number of direct synthesis mode
The advantages of agile and high frequency resolution of synthesis mode, obtains phase noise, spuious, frequency resolution and frequency conversion speed equal ten
Divide excellent wide-band microwave frequency source.
The calibration process of miniaturization Ku band broadband frequency agility Up/Down Conversion systems in the present embodiment is as follows：
System worked well state, not enabled redundancy calibration mixing channel, the normal up-conversion transmitting of system or down coversion
It receives.Implement to calibrate using three-step approach when calibration：
1) up-conversion passage and calibrated channel are enabled, as shown in figure 5, and being proper states shape by RF switch network settings
At intermediate frequency circuit, can test to obtain the phase pushing figure in the circuit using processing circuitry of intermediate frequency：
WhereinFor 1 phase pushing figure of calibration steps,For up-conversion passage phase pushing figure,For calibration
Channel phases deviant.
2) up-conversion passage and down coversion channel are enabled, as shown in fig. 6, and being proper states by RF switch network settings
Intermediate frequency circuit is formed, can test to obtain the phase pushing figure in the circuit using processing circuitry of intermediate frequency：
WhereinFor 2 phase pushing figure of calibration steps,For down coversion channel phases deviant.
3) calibrated channel and down coversion channel are enabled, as shown in fig. 7, and being proper states shape by RF switch network settings
At intermediate frequency circuit, can test to obtain the phase pushing figure in the circuit using processing circuitry of intermediate frequency：
WhereinFor 3 phase pushing figure of calibration steps.
WithIt is real-time test data, can be calculated by equation (1), (2), (3)WithObtain the phase offset of up-converter circuit and lower frequency changer circuit under current state (certain time or certain temperature)
Value.System calibration degree of freedom is high, not by environmental restrictions, can calibrate at any time, ensures system job stability and accuracy.
Claims (7)
1. a kind of miniaturization microwave broadband victory frequency Up/Down Conversion system, including use identical local oscillation signal up-conversion passage and
Down coversion channel；It is characterized in that：Further include that redundancy calibration mixing channel, redundancy calibration all the way are mixed channel using fixed
In the Up/Down Conversion system formed to coupler and switching network access up-conversion passage and down coversion channel, using described upper
Up-conversion or down coversion are realized in the mixing of the frequency conversion channel local oscillation signal that either down coversion channel uses.
2. miniaturization microwave broadband victory frequency Up/Down Conversion system according to claim 1, it is characterised in that：The upper change
Frequency channel and down coversion channel are double superheterodyne frequency conversion channel, and redundancy calibration mixing channel is using described
The two-stage for two local oscillation signals that up-conversion passage and down coversion channel use is mixed channel.
3. miniaturization microwave broadband victory frequency Up/Down Conversion system according to claim 1, it is characterised in that：The redundancy
In calibration mixing channel, it is additionally provided with the bandpass filter of the frequency centered on IF signal frequency.
4. miniaturization microwave broadband victory frequency Up/Down Conversion system according to claim 1, it is characterised in that：The lower change
In frequency channel, enter low noise filter after receiving radiofrequency signal, the low noise device is that the gallium nitride low noise of adjustable gain is put
Big device.
5. miniaturization microwave broadband victory frequency Up/Down Conversion system according to claim 1, it is characterised in that：The lower change
In frequency channel, enter low noise filter after receiving radiofrequency signal, the low noise device is large dynamic range low-noise amplifier；Institute
The large dynamic range low-noise amplifier stated includes rf diode wave detector and gain-adjustable low-noise amplifier.
6. according to any miniaturization microwave broadband victory frequency Up/Down Conversion system in claim 1 to 5, it is characterised in that：
The frequency source of the local oscillator includes snap-off diode harmonic oscillator, DDS direct digital synthesisers and mixing and filtering network；
The output of the crystal oscillator of 100MHz connects the input terminal of snap-off diode harmonic oscillator, the output of snap-off diode harmonic oscillator
Pass through the bandpass filter that centre frequency is 2.4GHz, 13.7GHz, 14.2GHz, 14.7GHz, 15.2GHz, centre frequency respectively
DDS direct digital synthesisers are connect for the output of the bandpass filter of 2.4GHz, the output of DDS direct digital synthesisers is passed through
300-800MHz bounce frequency filters filtering after with respectively with centre frequency be 13.7GHz, 14.2GHz, 14.7GHz, 15.2GHz
The output of bandpass filter be mixed to form mixing and filtering network.
7. a kind of calibration method of miniaturization microwave broadband victory frequency Up/Down Conversion system according to claim 1, feature
It is：Include the following steps：
1) up-conversion passage and redundancy calibration mixing channel are enabled, and is that proper states form intermediate frequency by RF switch network settings
Circuit can be tested to obtain the phase pushing figure in the circuit using processing circuitry of intermediate frequency：
WhereinFor 1 phase pushing figure of calibration steps,For up-conversion passage phase pushing figure,For calibrated channel
Phase pushing figure；
2) up-conversion passage and down coversion channel are enabled, and is that proper states form intermediate frequency circuit by RF switch network settings,
It can test to obtain the phase pushing figure in the circuit using processing circuitry of intermediate frequency：
WhereinFor 2 phase pushing figure of calibration steps,For down coversion channel phases deviant；
3) calibrated channel and down coversion channel are enabled, and is that proper states form intermediate frequency circuit, profit by RF switch network settings
It can be tested to obtain the phase pushing figure in the circuit with processing circuitry of intermediate frequency：
WhereinFor 3 phase pushing figure of calibration steps；
4) (1) is solved equation, (2), (3) can calculateWithObtain under current state up-converter circuit and under
The phase pushing figure of frequency changer circuit.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108761502A (en) * | 2018-08-31 | 2018-11-06 | 广东圣大电子有限公司 | A kind of multimode GNSS test receivers with precise phase center |
| CN110233638A (en) * | 2019-06-24 | 2019-09-13 | 上海航天测控通信研究所 | A kind of VHF frequency range landing search Radio Beacon |
| CN112564628A (en) * | 2020-12-08 | 2021-03-26 | 东南大学 | Modulator with wide frequency band and high intrinsic vibration suppression degree |
| CN113259021A (en) * | 2021-04-30 | 2021-08-13 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Automatic receiving and dispatching testing device for portable aviation radio station |
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| CN112564628A (en) * | 2020-12-08 | 2021-03-26 | 东南大学 | Modulator with wide frequency band and high intrinsic vibration suppression degree |
| CN112564628B (en) * | 2020-12-08 | 2023-08-08 | 东南大学 | Modulator with wide frequency band high local oscillation inhibition degree |
| CN113259021A (en) * | 2021-04-30 | 2021-08-13 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Automatic receiving and dispatching testing device for portable aviation radio station |
| CN113259021B (en) * | 2021-04-30 | 2023-06-02 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Portable automatic receiving and transmitting testing device for aviation radio station |
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