CN208285298U - A kind of S-band surveys the analog receiver module of unrestrained radar - Google Patents
A kind of S-band surveys the analog receiver module of unrestrained radar Download PDFInfo
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- CN208285298U CN208285298U CN201820370033.9U CN201820370033U CN208285298U CN 208285298 U CN208285298 U CN 208285298U CN 201820370033 U CN201820370033 U CN 201820370033U CN 208285298 U CN208285298 U CN 208285298U
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- local oscillator
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Abstract
The utility model provides a kind of analog receiver module of unrestrained radar of S-band survey, can be realized and exports signal caused by the unrestrained radar frequency synthesizer of S-band survey for stable intermediate-freuqncy signal.The utility model includes analog receiver circuit, matched aluminium alloy shielding cavity two parts.Analog receiver circuit includes RF preselection amplification module, first time down coversion and intermediate frequency amplification module, second of down coversion and intermediate frequency amplification module, the first local oscillator module and the second local oscillator module.Wherein RF preselection amplification module, the first local oscillator module and the second local oscillator module are controlled by signal TP, so that output signal changes between intermediate-freuqncy signal and white noise are straight.Aluminium alloy shielding cavity is divided into the main structure of U-shaped, SMA mounting plate, upper cover plate and the SMA connector of two sides.There is partition, partition is customized according to the relative position of radio frequency analog receiver circuit modules, to realize the isolation of each circuit part inside the main structure of shielding cavity U-shaped.
Description
Technical field
The utility model belongs to microwave Doppler Radar Technology field, and the simulation for being related to a kind of unrestrained radar of S-band survey receives
Machine module.
Background technique
China coastline is long, and ocean area is extensive, therefore observation to wave and research are in science, national defence, economy etc.
Aspect has extensive actual demand.The conventional method for obtaining ocean dynamics parameter mainly uses buoy, seat bottom type pressure
The tools such as sensor, subsurface buoy, current meter are flowed or one-point measurement on the spot on oceanographic research ship, offshore platform and other places.This
A little methods are influenced by weather, there is operations it is difficult, at high cost, measurement area is small the problems such as, it is difficult to satisfaction is actually needed.It is micro-
Wave Doppler's Doppler radar is a kind of based on doppler principle, by continuously measuring the orbital velocity of all directions water particle and returning
Intensity of wave obtains ocean wave spectrum using linear ocean wave theory and then derives the New Type Radar of ocean wave parameter.The measurement of such radar
Precision is high, antenna volume is small, measurement area is big, and the round-the-clock real-time measurement of wave may be implemented.Meanwhile how general microwave Doppler is
Strangle radar resolution ratio with higher and sample rate, can accurately and real-time reflect sea detailed information, to ocean environment observation,
Oceanographic survey and scientific research of seas have important value, are with a wide range of applications.Microwave S-band survey unrestrained radar system by
Multiple component compositions, in hardware system, receiver is its important component part.Radar receiver is faced with high work frequency
The challenge such as rate, high integration and low-power consumption, and rf analog front-end circuit is responsible for receiving all sea return information, directly certainly
The sensitivity and dynamic range for having determined receiver are core and key modules in receiver.The structure of radio frequency analog receiver
Generally there are super-heterodyne architecture, Direct-conversion (zero intermediate frequency) structure, image frequency to inhibit structure and low intermediate frequency structure etc..These types
Mechanism is required to carry out received echo-signal the frequency conversion of once or more, and radiofrequency signal is become baseband signal or frequency
The lower signal of rate, then by bandpass sampling, be sent into DSP and carry out digital processing.In super-heterodyne architecture, in order to improve receiver
Selectivity, generally will use multiple high q-factor bandpass filter, the width phase distortion of system is larger, influences the matter of subsequent processing
Amount, the analog device used is more, and circuit structure is complicated, and inconvenience is integrated, and system stability is poor, although and zero intermediate frequency scheme
Structure is simple, be easily integrated, adaptability is good, but there is also many masty problems, such as direct current offset, even-order harmonic is lost
Very, the problems such as I/Q channel imbalance, flicker noise.Image frequency inhibits structure and low intermediate frequency structure, and there is also filters to be difficult to
The disadvantages of realization, poor anti jamming capability.It is higher additionally, due to the frequency of S-band, for the local oscillation signal being mixed power again compared with
Greatly, it is easy to interfere the work of other various pieces circuits, or even be generated after being mixed with other frequencies in output end serious miscellaneous
Scattered signal.Therefore how to inhibit the mutual crosstalk of each signal in radio frequency analog receiver circuit to be also one very important to ask
Topic.
Utility model content
Technical problem to be solved in the utility model is to overcome the deficiencies of the prior art and provide a kind of unrestrained thunder of S-band survey
The analog receiver module reached.
In order to solve the above technical problems, the utility model adopts the following technical solution.
A kind of S-band surveys the analog front-end module of unrestrained radar, including analog receiver circuit, matched aluminium alloy shielding cavity
Body two parts.Analog receiver circuit includes RF preselection amplification module, first time down coversion and intermediate frequency amplification module, second
Down coversion and intermediate frequency amplification module, the first local oscillator module and the second local oscillator module.Wherein the RF preselection amplification module, the
The control of one local oscillator module and the second local oscillator module by external control signal TP.TP is square wave of the duty ratio close to 50%.When
When TP is high level, the RF switch in RF preselection amplification module, the first local oscillator module and the second local oscillator module is both turned on, mould
Block output is intermediate-freuqncy signal；When TP is low level, in RF preselection amplification module, the first local oscillator module and the second local oscillator module
Switch be turned off, module output be white noise.Aluminum shielding cavity includes internal partition and bottom plate, side SMA connector peace
Loading board, cavity cover and SMA connector.
RF preselection amplification module in the analog receiver circuit is mixed with first time down coversion and intermediate frequency amplification
Module is connected；First time down coversion and intermediate frequency amplification module are put with the first local oscillator module, second of down coversion and intermediate frequency respectively
Big module, RF preselection amplification module are connected；Second of down coversion and intermediate frequency amplification module respectively with the second local oscillator module,
Down coversion and intermediate frequency amplification module are connected.Above-mentioned all module surroundings have mounting hole, by screw and shielding cavity
Screw hole is tightly fastened.
Moreover, RF preselection amplification module includes a radio frequency limiting amplifier, a RF switch, a RF preselection
Filter and a radio frequency amplifier；Radio frequency limiting amplifier, RF switch, RF preselection filter, radio frequency amplifier are successively
Connection.
The mixing of first time down coversion and intermediate frequency amplification module include a frequency mixer, two impedance matchings attenuation network,
One amplifier and a broadband band-pass filter；The attenuation network of first impedance matching, frequency mixer, bandpass filter, amplification
Device, the first impedance matching attenuation network be sequentially connected.
Second of down coversion and intermediate frequency amplification module include a frequency mixer, two amplifiers, two narrow-band bandpass filtering
Device, three π type impedance matchings filter network and a numerical-control attenuator；Frequency mixer, the first narrow band filter, the first π
The filter network of type impedance matching, the first amplifier, the 2nd π type impedance matching filter network, numerical-control attenuator, the 3rd π type
The filter network of impedance matching, the second amplifier, the second narrow band filter are sequentially connected.
First local oscillator module includes a RF switch, the attenuation network of impedance matching, an amplifier and one
Bandpass filter；RF switch, the attenuation network of impedance matching, amplifier, bandpass filter are sequentially connected.
Second local oscillator module includes a RF switch, the attenuation network of impedance matching, an amplifier and one
Bandpass filter；RF switch, the attenuation network of impedance matching, amplifier, bandpass filter are sequentially connected.
The aluminium alloy shielding cavity is mainly made of five parts, is the main structure of U-shaped, the SMA of two sides respectively
It is cuboid that mounting plate, upper cover plate and SMA connector, which are a sealing by screw connection between five parts,.Shielding cavity U
There is partition, partition is determined according to the relative position of radio frequency analog receiver circuit modules inside the main structure of font
System, to realize the isolation of each circuit part.Believed according to the input and output of radio frequency analog receiver circuit the left and right sides of cavity
Radio frequency SMA connector is installed in number position aperture.
The S-band surveys the input of the analog receiver circuit of unrestrained radar and surveys unrestrained radar frequency synthesizer institute for S-band
2 local oscillation signals generated and 1 radiofrequency signal.Wherein the first local oscillation signal LO1 is single frequency sinusoidal wave signal, and frequency is
2.17-2.37GHz, power are+7dBm, are input to the first local oscillator module；Second local oscillation signal LO2 is linear frequency modulation continuous wave letter
Number FMCW, frequency 538.6MHz, power are+7dBm, are input to the second local oscillator module；Radiofrequency signal RF is linear frequency modulation interruption
Continuous wave signal FMICW, frequency 2.75-2.95GHz are input to RF preselection amplification module.Three input signals are by this
Circuit exports the intermediate-freuqncy signal for being 41.4MHz for a frequency, is handled for following digital receiver.
The signal lead of the entire PCB of the utility model is all made of the form of coplanar ground connection waveguide, and characteristic impedance and each
Component input and output impedance matches, and is 50 ohm.And it covers copper to all layers of circuit board at two frequency mixers to dig
It removes, and all signal wires and power supply line avoid frequency mixer to realize the high-isolation of local oscillator and intermediate-freuqncy signal.
The utility model uses the structure of down coversion twice on the basis of superhet, and cooperates RF preselection
Filter effectively avoids the signal of other frequencies in space so that the image-frequency rejection ratio of receiver can achieve 130dBc
Interference to radar echo signal.Meanwhile RF preselection amplification module, the first local oscillator module are controlled simultaneously using TP pulse signal
With the on-off of the second local oscillator module, the high degree of isolation of receiving and transmitting signal is realized, the dynamic range of AFE(analog front end) is expanded, improves
The sensitivity of receiver.And it is designed by suitable structure and parts selection, so that the noise coefficient of receiver is smaller, thus
Finally sensitivity is made to reach -130dBm.Have benefited from higher sensitivity simultaneously, the linear dynamic range of receiver is finally reached
90dB.
Compared with prior art, the utility model has the following advantages and beneficial effects:
1, the three dB bandwidth of the utility model is 2600MHz to 3100MHz, therefore is suitable in 2.6GHz to 3.1GHz
Rf signal reception, especially suitable for S-band Doppler Lidar System.Receiver is total to increase using 5V and 12 pair of single supply power supply
Benefit is 30-60dB digit control, and receiver is anti-to burn maximum radio frequency input power+30dBm.The machine has integrated level height, performance good,
The features such as at low cost.
2, the utility model uses wideband filtered in RF preselection amplification module, the first mixing and intermediate frequency amplification module
Device, reduces the delay of signal, and the phase distortion of rf echo signal is small.And it can be real by replacement RF preselection filter
The change of existing a certain range of bandwidth frequency, module versatility are good.
3, the utility model combines anti-burn of clipping with signal pre-amplification in RF preselection amplification module, so that receiving
With certain burn-out resistance while machine is with good sensitivity.
4, the utility model uses the structure of down coversion twice on the basis of superhet, and cooperates radio frequency pre-
Selecting filter effectively avoids the letter of other frequencies in space so that the image-frequency rejection ratio of receiver can achieve 130dBc
Interference number to radar echo signal.
5, the utility model controls RF preselection amplification module, the first local oscillator module and second using TP pulse signal simultaneously
The on-off of local oscillator module realizes the high degree of isolation of receiving and transmitting signal, expands the dynamic range of AFE(analog front end), improves receiver
Sensitivity.And it is designed by suitable structure and parts selection, so that the noise coefficient of receiver is smaller, to finally make
It obtains sensitivity and reaches -130dBm.Have benefited from higher sensitivity simultaneously, the linear dynamic range of receiver is finally reached
90dB。
6, the various pieces of circuit are isolated by reasonably separating in aluminium alloy shielding cavity for the utility model, are kept away
Exempt from high-frequency local oscillation signal to interfere other circuit modules of radio frequency analog receiver by space radiation.And use π
Type network carries out low-pass filtering on the signal path of the second intermediate frequency, has suppressed each spuious width in output signal well
Degree, so that the signal to noise ratio of receiver reaches 70dBc.On the other hand, due to the effect of shielding cavity, radio frequency analog receiver is to outside
The interference of other systems module is also suppressed.
7, the utility model by impedance control, impedance matching, cover copper hollow out, with reference to the technologies such as be isolated, to entire mould
The circuit part of quasi- receiver module carried out radio frequency in terms of design optimization, improve the performance indexes of receiver.
Detailed description of the invention
Fig. 1 is the circuit block diagram of the utility model embodiment.
Fig. 2 is the RF preselection amplification module block diagram in the utility model embodiment.
Fig. 3 is first time down coversion and intermediate frequency amplification module block diagram in the utility model embodiment.
Fig. 4 is second of down coversion and intermediate frequency amplification module block diagram in the utility model embodiment.
Fig. 5 is the first local oscillator module frame chart in the utility model embodiment.
Fig. 6 is the second local oscillator module frame chart in the utility model embodiment.
Fig. 7 is the structural schematic diagram of the aluminium alloy shielding cavity in the utility model embodiment.
1-SMA connector, 2-left side SMA connector mounting plates, 3-right side SMA connector mounting plates, 4-U-shaped
Main structure, 5-upper cover plates, 6-interior separations.
Specific embodiment
The utility model is described in further detail for embodiment shown in reference to the accompanying drawing.
As shown in Fig. 1, the radio frequency analog receiver circuit in the utility model includes RF preselection amplification module, first
Secondary down coversion and intermediate frequency amplification module, second of down coversion and intermediate frequency amplification module, the first local oscillator module and the second local oscillator module.
The wherein control of RF preselection amplification module, the first local oscillator module and the second local oscillator module by transmitting pulse TP.
The RF preselection amplification module is mixed with first and intermediate frequency amplification module is connected；First mixing and intermediate frequency are put
Big module is mixed respectively with the first local oscillator module, second and intermediate frequency amplification module, RF preselection amplification module are connected；Second is mixed
Frequently and intermediate frequency amplification module is mixed respectively with the second local oscillator module, first and intermediate frequency amplification module is connected.The signal of entire PCB
Cabling is all made of the form of coplanar ground connection waveguide, and characteristic impedance matches with each component input and output impedance, is 50 Europe
Nurse.
As shown in Fig. 2, in this example RF preselection amplification module include a limiting amplifier, a RF switch,
One radio frequency amplifier and a broadband band-pass filter.Wherein limiting amplifier device is using WanTcom company
WHM1045LE, gain >=26dB, noise coefficient≤1.25dB, standing-wave ratio≤1.5, maximal input 30dBm；Radio frequency is opened
It closes and uses SKY13286-359LF, insertion loss≤1.2dB, isolation >=58dB, the on-off switch time is less than 50ns, control
Level is Transistor-Transistor Logic level, high level conducting；One broadband band-pass filter all uses the BFCN-2850 of Mini-Circuits company
+, free transmission range 2750-2950MHz, loss≤4dB, stopband attenuation >=20dB；Radio frequency amplifier is public using Mini-Circuits
The Gali-39+ of department, gain >=17.7dB, noise coefficient are less than 2.4dB, export third order intermodulation point >=22.9dBm.
As shown in Fig. 3, the first mixing and intermediate frequency amplification module include a frequency mixer, two impedances in this example
Attenuation network, an amplifier and the broadband band-pass filter matched.Wherein the attenuation network of impedance matching is used to adjust most
Whole gain ranging.Frequency mixer uses MCA-35H+, radio-frequency head frequency range 500-3500MHz, local oscillator end frequency range 500-
3500MHz, output end frequency range 10-1500MHz, conversion loss≤7dB, isolation >=20dB；Broadband band-pass filter is adopted
With BPF-A580+, free transmission range 520-640MHz, loss≤2dB, stopband attenuation >=30dB；Amplifier uses GALI-74+, increases
Benefit >=22dB, noise coefficient≤2.7dB export third order intermodulation point >=37dB.Two impedance matching networks are adjusted to be input to
The signal of rear class frequency mixer is far smaller than this amplitude.In the lower section of frequency mixer, all layers of circuit of the copper that covers all is cut out, and
And all signal wires, power supply line are avoided immediately below frequency mixer, to reduce the first local oscillator and its being mixed with various signals
Component interferes circuit other parts.
As shown in Fig. 4, in this example second mixing and intermediate frequency amplification module include a frequency mixer, two amplifiers,
Two narrow band filters, three impedance matchings filter network and a numerical-control attenuator.Wherein frequency mixer uses ADE-4
+, radio-frequency head and local oscillator end frequency range 200-1000MHz, output end frequency range DC-800MHz, conversion loss≤7dB, every
From degree >=30dB；Two amplifiers all use GALI-74+, gain >=22dB of each amplifier, and noise coefficient≤2.7dB is defeated
3 rank sections >=37dB out；Two narrow band filters all use SAW filter SF0457, centre frequency 41.4MHz,
1dB bandwidth >=1.06MHz, loss≤4.1dB, passband fluctuation≤0.0dB, Out-of-band rejection >=25dB；Numerical-control attenuator uses
DAT-31R5-PP+, attenuation range 31.5dB, minimal attenuation stepping 0.5dB, control mode are 6 controls, and control level is TTL
Level.The filter network of impedance matching is used to further suppress other frequency components other than the second intermediate frequency, to realize that high letter is miscellaneous
Than.Likewise, carrying out hollowing out processing to all layers of the copper that covers below frequency mixer, signal wire, power supply line get around frequency mixer, to keep away
Exempt from various interference.Meanwhile being furnished with L-type impedance matching network in the input/output terminal of two narrow band filters, to the defeated of filter
The impedance for entering output port is matched, and is allowed to close to 50 ohm, to reduce the loss that signal reflex is brought.
As shown in Fig. 5, in this example the first local oscillator module include a RF switch, impedance matching attenuation network
Network, an amplifier and a bandpass filter.Wherein RF switch use SKY13286-359LF, insertion loss≤
1.2dB, isolation >=58dB, on-off switch time are less than 50ns, and control level is Transistor-Transistor Logic level, high level conducting；Amplifier is adopted
With GALI-84+, gain >=18dB, noise coefficient≤4.4 export third order intermodulation point >=38dB；Bandpass filter uses
The BFCN-2275+ of Mini-Circuits company, free transmission range 2170-2380MHz, loss≤2dB, stopband attenuation >=30dB；
Adjustment attenuation network makes the output power of this module be 17dBm.
As shown in Fig. 6, the second local oscillator module includes a RF switch, a Π type resistors match net in this example
Network, an amplifier and a bandpass filter.Wherein RF switch use SKY13286-359LF, insertion loss≤
1.2dB, isolation >=58dB, on-off switch time are less than 50ns, and control level is Transistor-Transistor Logic level, high level conducting；Amplifier is adopted
With GALI-59+, gain >=20dB, noise coefficient≤4.3 export third order intermodulation point >=33dB；Bandpass filter uses
The SXBP-507+ of Mini-Circuits company, free transmission range 460-560MHz, loss≤2dB, stopband attenuation >=20dB；Adjustment
Attenuation network makes the output power of this module be 7dBm.
In this example, when TP pulse is high level, RF preselection amplification module, the first local oscillator module and the second local oscillator mould
Switch in block is turned off, and the 41.4MHz intermediate-freuqncy signal of the second mixing and the output of intermediate frequency amplification module is noise.It is in TP pulse
When low level, the switch in RF preselection amplification module, the first local oscillator module and the second local oscillator module is both turned on.First local oscillator mould
The 2.17-2.37GHz simple signal of input is amplified to+17dBm by block, and the second local oscillator module linearly adjusts the 538.6MHz of input
Frequency FMCW signal is amplified to+7dBm, and the 2.75-2.95GHz echo-signal of input is amplified and filtered by RF preselection amplification module
Wave is mixed with the first local oscillation signal in the first mixing and intermediate frequency amplification module, amplifies, filters in the linear frequency modulation for becoming 580MHz
Frequency signal is mixed with the second local oscillation signal in the second mixing and intermediate frequency amplification module later, amplifies, filtering and become 41.4MHz's
Intermediate-freuqncy signal, for the processing of following digital receiver.
As shown in Fig. 7, the aluminium alloy shielding cavity in this example is mainly made of five parts, is respectively 1 according to number:
SMA connector, 2: left side SMA connector mounting plate, 3: right side SMA connector mounting plate, 4:U font main structure, 5: cavity
Lid.It is a sealing by screw connection between five parts is cuboid.Have inside the main structure of shielding cavity U-shaped every
Disconnected, partition is customized according to the relative position of radio frequency analog receiver circuit modules, to realize each circuit part
Isolation.Input/output signal position aperture of the left and right sides of cavity according to radio frequency analog receiver circuit, installation radio frequency SMA company
Connector.Appearance is a square after the equipment of shielding cavity, and surface is provided with fixed screw holes and is used to for shielding cavity to be fixed on S-band survey
Inside unrestrained radar.
Claims (6)
1. the analog receiver module that a kind of S-band surveys unrestrained radar, it is characterised in that: including analog receiver circuit and aluminium alloy
Shielding cavity；Wherein analog receiver circuit includes RF preselection amplification module, first time down coversion and intermediate frequency amplification module, second
Secondary down coversion and intermediate frequency amplification module, the first local oscillator module and the second local oscillator module；Aluminium alloy shielding cavity includes the main body of U-shaped
It is length that structure, the SMA mounting plate of two sides, upper cover plate and SMA connector, which are a sealing by screw connection between five parts,
The main structure inside of cube, shielding cavity U-shaped has partition, separates the phase according to radio frequency analog receiver circuit modules
Position is customized, to realize the isolation of each circuit part；The left and right sides of cavity is according to radio frequency analog receiver circuit
The aperture of input/output signal position, install radio frequency SMA connector；
RF preselection amplification module is mixed with first and intermediate frequency amplification module is connected；First mixing and intermediate frequency amplification module difference
It is mixed with the first local oscillator module, second and intermediate frequency amplification module, RF preselection amplification module is connected；Second mixing and intermediate frequency are put
Big module is mixed respectively with the second local oscillator module, first and intermediate frequency amplification module is connected；Above-mentioned all module surroundings are with peace
Hole is filled, is tightly fastened by screw and shielding cavity female screw hole.
2. the analog receiver module that a kind of S-band according to claim 1 surveys unrestrained radar, it is characterised in that: described to penetrate
Frequency pre-selection amplification module is penetrated including a radio frequency limiting amplifier, a RF switch, a RF preselection filter and one
Audio amplifier；Radio frequency limiting amplifier, RF switch, RF preselection filter, radio frequency amplifier are sequentially connected.
3. the analog receiver module that a kind of S-band according to claim 1 surveys unrestrained radar, it is characterised in that: described the
The mixing of down coversion and intermediate frequency amplification module include the attenuation network, an amplifier of a frequency mixer, two impedance matchings
With a broadband band-pass filter；The attenuation network of first impedance matching, frequency mixer, bandpass filter, amplifier, the first impedance
Matched attenuation network is sequentially connected.
4. the analog receiver module that a kind of S-band according to claim 1 surveys unrestrained radar, it is characterised in that: described the
Secondary down coversion and intermediate frequency amplification module include a frequency mixer, two amplifiers, two narrow band filters, three π types
The filter network of impedance matching and a numerical-control attenuator；Frequency mixer, the first narrow band filter, the first π type impedance matching
Filter network, the first amplifier, the filter network of the 2nd π type impedance matching, numerical-control attenuator, the 3rd π type impedance matching
Filter network, the second amplifier, the second narrow band filter are sequentially connected.
5. the analog receiver module that a kind of S-band according to claim 1 surveys unrestrained radar, it is characterised in that: described the
One local oscillator module includes the attenuation network, an amplifier and a bandpass filter of a RF switch, impedance matching；
RF switch, the attenuation network of impedance matching, amplifier, bandpass filter are sequentially connected.
6. the analog receiver module that a kind of S-band according to claim 1 surveys unrestrained radar, it is characterised in that: described the
Two local oscillator modules include the attenuation network, an amplifier and a bandpass filter of a RF switch, impedance matching；
RF switch, the attenuation network of impedance matching, amplifier, bandpass filter are sequentially connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820370033.9U CN208285298U (en) | 2018-03-19 | 2018-03-19 | A kind of S-band surveys the analog receiver module of unrestrained radar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820370033.9U CN208285298U (en) | 2018-03-19 | 2018-03-19 | A kind of S-band surveys the analog receiver module of unrestrained radar |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111007469A (en) * | 2019-12-25 | 2020-04-14 | 上海铭剑电子科技有限公司 | Receiver of radar simulator |
| CN111833687A (en) * | 2020-06-30 | 2020-10-27 | 武汉海华信通科技有限公司 | Radar receiving and dispatching experiment system |
-
2018
- 2018-03-19 CN CN201820370033.9U patent/CN208285298U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111007469A (en) * | 2019-12-25 | 2020-04-14 | 上海铭剑电子科技有限公司 | Receiver of radar simulator |
| CN111833687A (en) * | 2020-06-30 | 2020-10-27 | 武汉海华信通科技有限公司 | Radar receiving and dispatching experiment system |
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