CN103018724B - Active transponder for broadband - Google Patents
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- CN103018724B CN103018724B CN201110280836.8A CN201110280836A CN103018724B CN 103018724 B CN103018724 B CN 103018724B CN 201110280836 A CN201110280836 A CN 201110280836A CN 103018724 B CN103018724 B CN 103018724B
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Abstract
The invention discloses an active transponder for a broadband, and relates to the microwave remote sensing technology. The active transponder comprises a transmitting-receiving unit and a control unit, wherein the transmitting-receiving unit is mainly used for receiving a pulse signal transmitted by a radar, performing filtering, amplifying, delaying, modulating and the like on the signal, transmitting the signal to the radar, and coupling, detecting and sampling the signal simultaneously; the controlling unit is mainly used for controlling working parameters of the transmitting-receiving unit, monitoring the working status of the transmitting-receiving unit, and receiving and recording sampling data transmitted by the transmitting-receiving unit; and the transmitting-receiving unit and the control unit are connected through an electric cable and a monitoring cable. The active transponder for the broadband, disclosed by the invention, is applicable to radiometric calibration of a high-resolution synthetic aperture radar (SAR).
Description
Technical field
The present invention relates to microwave remote sensing technique field, be particularly applied to a kind of broadband active transponder of high resolution synthetic aperture radar radiation calibration.
Background technology
Synthetic-aperture radar (SAR) is a kind of advanced person's microwave remote sensing instrument, it has the ability of round-the-clock, round-the-clock, high resolving power, large area remotely sensed image, and its view data has been brought into play great function in fields such as geology, agricultural, the hydrology, forestry, ocean, Cartography, military surveillance and target identification and information extractions.Early stage SAR application mainly concentrates on qualitative remote sensing aspect, be Main Basis be the information such as position, shape and echo power that SAR image provides, yet at aspects such as clutter statistical characteristics research, soil humidity measuring, crop precise classification, sea fact finding, target identifications, qualitative remote sensing application is greatly limited, in fact in these application processes, need to set up the quantitative relationship between radar image and target cross section or scattering coefficient.Determining of this quantitative relationship, is completed by SAR radiation calibration.SAR radiation calibration is exactly that the radar cross section (RCS) of this resolution element of the gray-scale value representative of each pixel in radar image is carried out to accurate and correct mensuration.International SAR system, as ERS-1, SIR-C, X-SAR and RADARSAT etc., adopted radiation calibration technology.
Along with the continuous progress of technology, the resolution of SAR is more and more higher.At present, the resolution of external satellite-borne SAR reaches 1m left and right, and the resolution of external carried SAR has reached 0.1m.Domestic also very fast in the development in SAR field in recent years, some scientific research institutions have succeeded in developing respectively SAR system separately, the image that to have obtained resolution be 3-0.5m.
SAR is carried out to the targeting device that radiation calibration need to be used known radar sectional area, and the dimensional requirement of targeting device can not be greater than a resolution element, and traditional way is to adopt passive corrner reflector.But along with improving constantly of SAR resolution, passive corrner reflector is subject to the restriction of size, and enough large RCS can not be provided.In addition, the background ground clutter of calibration field is easy to infiltrate in rate-aided signal, and radiation calibration precision is reduced greatly.By contrast, active transponder is by receiving SAR signal, amplify, forwarding, Area Objects in analog, and its RCS is no longer dependent on physical size, but only relevant with the gain of amplifying link.In addition, active transponder can also carry out the signal receiving the processing such as time delay, modulation, makes rate-aided signal and background clutter signal depart from correlativity, thereby improves the precision of radiation calibration, meets the radiation calibration requirement of high resolution synthetic aperture radar.
Summary of the invention
The object of this invention is to provide a kind of broadband active transponder, overcome the deficiency of passive targeting device in high resolution synthetic aperture radar radiation calibration, by receiving, amplify, forward SAR signal, carry out Area Objects in analog, thereby realize larger and accurate, adjustable radar cross section; Before forwarding, can carry out time delay and sine amplitude modulation to signal, make rate-aided signal and background clutter signal eliminate correlativity, improve the precision of radiation calibration; Can carry out to the received signal amplitude detection, and rectified signal is sampled and record, contribute to SAR antenna radiation pattern to analyze.In addition, a kind of broadband active transponder of the present invention also have power supply mode flexibly, the feature such as be easy to carry, adapt to the outfield radiation calibration requirement of high-resolution SAR.
For achieving the above object, technical solution of the present invention is:
A broadband active transponder, it comprises Transmit-Receive Unit and control module, and Transmit-Receive Unit monitor-interface is connected with control module monitor-interface by monitoring cable, and Transmit-Receive Unit power supply interface is connected with control module power supply interface by power cable; The major function of Transmit-Receive Unit is signal to be carried out to the processing such as filtering, amplification, delay, modulation, and then signal is transmitted to radar, simultaneously to signal be coupled, detection and sampling; Control module major function is that the running parameter of Transmit-Receive Unit is controlled, and the duty of monitoring Transmit-Receive Unit, receives and record the sampled data that Transmit-Receive Unit is sent.
Described broadband active transponder, described in it, Transmit-Receive Unit comprises receiving antenna, signal processing module, emitting antenna, and receiving antenna is electrically connected to signal processing module input end, and emitting antenna is electrically connected to signal processing module output terminal;
Receiving antenna, receives the pulse signal that SAR launches;
Signal processing module, carries out filtering, amplification, delay, modulation treatment to the received signal, simultaneously to signal be coupled, detection and sampling;
Emitting antenna, is transmitted to SAR by the signal after processing.
Described broadband active transponder, receiving antenna, emitting antenna described in it, be Ku wave band standard-gain horn antenna.
Described broadband active transponder, signal processing module described in it, comprises that input isolator, bandpass filter, directional coupler, low noise amplifier, coaxial delay line, amplitude equalizer, small signal amplifier, large stepping numerical-control attenuator, amplitude modulation(PAM) module, small step enter numerical-control attenuator, power amplifier, output isolator, logarithmic detector amplifier, A/D sampling and control panel;
Input isolator, bandpass filter, directional coupler, low noise amplifier, coaxial delay line, amplitude equalizer, small signal amplifier, large stepping numerical-control attenuator, amplitude modulation(PAM) module, small step are entered numerical-control attenuator, power amplifier, output isolator and are sequentially connected in series successively;
The coupled end of directional coupler is electrically connected to the pulse signal input terminal of A/D sampling and control panel through logarithmic detector amplifier, the control end that the control end of A/D sampling and control panel enters numerical-control attenuator with large stepping numerical-control attenuator, amplitude modulation(PAM) module, small step is respectively electrically connected to, and both-way communication; The data terminal of A/D sampling and control panel is connected with control module through monitoring cable.
Described broadband active transponder, control module described in it, comprises microcomputer system, high-speed data acquisition card, solid-state electronic dish, keyboard, display; Microcomputer system, is electrically connected to high-speed data acquisition card, solid-state electronic dish, keyboard, display respectively, and both-way communication;
In microcomputer system, copy broadband active transponder and controlled software;
The RS422 serial ports of microcomputer system, the interface of high-speed data acquisition card are electrically connected to the data terminal of A/D sampling and control panel through monitoring cable respectively, and both-way communication.
Described broadband active transponder, microcomputer system described in it, is PC104 industrial computer.
Described broadband active transponder, its flow process is:
A) receiving antenna, receives the pulse signal that SAR launches, and through input isolator, is transferred to signal processing module;
B) signal processing module is done following flow process:
Bandpass filter filtering receives the outer clutter of band of signal; Directional coupler directly passes through most of signal, and sub-fraction power coupling output is used for to detection below; Low noise amplifier carries out first order low noise amplification by the signal receiving; Coaxial delay line is carried out time delay by the signal receiving; The amplitude distortion that amplitude equalizer causes coaxial delay line compensates; Small signal amplifier, carries out second level amplification by the signal receiving, the decay that compensating coaxial lag line causes; Large stepping numerical-control attenuator carries out larger quantitative decay to signal, adjustment System gain; Amplitude modulation(PAM) module is carried out sine amplitude modulation to the received signal, ambient temperature information is sent to A/D sampling and control panel simultaneously; Small step is entered numerical-control attenuator system-gain is carried out to trace adjustment, the system-gain variation that compensation causes because of variation of ambient temperature, the stability of keeping system gain; Logarithmic detector amplifier carries out amplitude detection to the signal of directional coupler coupling output; The SAR pulse envelope signal that A/D sampling and control panel go out detection carries out A/D sampling, and gives control module by sampling data transmitting, completes the control that large stepping numerical-control attenuator, amplitude modulation(PAM) module, small step are entered to numerical-control attenuator simultaneously;
C) on PC104 industrial computer, move broadband active transponder and control software, whole active transponder is controlled and monitored;
D) during running software, by keyboard input control parameter, to PC104 industrial computer, computing machine sends to A/D sampling and control panel by RS422 serial communication by instruction, and receives the monitoring information that A/D sampling and control panel transmit;
E) display shows broadband active transponder control software interface, facilitates man-machine interaction;
F) high-speed data acquisition card, carries out buffer memory, processing the sampled data that A/D samples and control panel passes over, and send PC104 industrial computer, and be stored to solid-state electronic dish by pci bus;
G) power amplifier carries out after final stage power amplification the signal of handling well, through output isolator, by emitting antenna, is transmitted to radar.
Described broadband active transponder, small signal amplifier described in it, is the amplifier of peak power output 10dBm; Large stepping numerical-control attenuator is 3db stepping numerical-control attenuator; Numerical-control attenuator is entered in small step, is 0.2db stepping numerical-control attenuator.
Good effect of the present invention is:
1) after adopting amplifier to amplify to the received signal, forward again, can the in the situation that of transponder constancy of volume, realize larger RCS.
2) owing to adopting numerical-control attenuator to regulate system-gain, can realize multiple different RCS.
3) owing to adopting small step to enter numerical-control attenuator, according to system environments temperature variation, in real time system-gain is compensated to decay with keeping system gain stabilization, improved the degree of accuracy of broadband active transponder RCS.
4) owing to having adopted time delay and amplitude modulation technique, make to be forwarded signal and the background clutter signal disengaging correlativity that device forwards, adopt the effectively Background suppression noise jamming of corresponding rate-aided signal disposal route, improve radiation calibration precision.
5) due to the SAR pulse signal receiving is carried out to envelope detection sample record, thereby can to SAR antenna bearingt, to directional diagram, analyze by the data of recording.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of broadband active transponder of the present invention; Wherein, 1 is Transmit-Receive Unit, and 2 is control module.
Fig. 2 is the structural principle block diagram of broadband active transponder of the present invention;
Fig. 3 is the structural principle block diagram of the Transmit-Receive Unit that relates in the present invention; Wherein, 201 is receiving antenna, and 202 is input isolator, 203 is bandpass filter, and 204 is directional coupler, and 205 is low noise amplifier, 206 is coaxial delay line, and 207 is amplitude equalizer, and 208 is small signal amplifier, 209 is large step attenuator, and 210 is amplitude modulation(PAM) module, and 211 enter numerical-control attenuator for small step, 212 is power amplifier, and 213 is output isolator, and 214 is emitting antenna, 215 is logarithmic detector, and 216 is A/D sampling and control module.
Fig. 4 is the structural principle block diagram of the control module that relates in the present invention; Wherein, 31 is PC104 industrial computer, and 32 is high-speed data acquisition card, and 33 is solid-state electronic dish, and 34 is keyboard, and 35 is display.
Embodiment
A kind of broadband active transponder of the present invention, as shown in Figure 1, its structural principle block diagram as shown in Figure 2 for its structured flowchart.Fig. 1 comprises: Transmit-Receive Unit 1, control module 2.Wherein, the monitor-interface of Transmit-Receive Unit 1 is connected with the monitor-interface of control module 2 by monitoring cable; The power supply interface of Transmit-Receive Unit 1 is connected with the power supply interface of control module 2 by power cable.The major function of Transmit-Receive Unit 1 is signal to be carried out to the processing such as filtering, amplification, delay, modulation, and then signal is transmitted to radar, simultaneously to signal be coupled, detection and sampling; Control module 2 major functions are that the running parameter of Transmit-Receive Unit is controlled, and the duty of monitoring Transmit-Receive Unit, receives and record the sampled data that Transmit-Receive Unit is sent.
As shown in Figure 3, figure comprises the structural principle block diagram of the Transmit-Receive Unit 1 of broadband active transponder of the present invention:
Be interconnected as successively receiving antenna 201, input isolator 202, bandpass filter 203, directional coupler 204, low noise amplifier 205, coaxial delay line 206, amplitude equalizer 207, small signal amplifier 208, large stepping numerical-control attenuator 209, amplitude modulation(PAM) module 210, little step attenuator 211, power amplifier 212, output isolator 213, emitting antenna 214, also have in addition logarithmic detector amplifier 215, A/D sampling and control panel 216.Wherein the coupling output terminal of directional coupler 204 is connected with the input end of logarithmic detector amplifier 215; The output terminal of logarithmic detector amplifier 215 is connected with the pulse signal input terminal of A/D sampling and control panel 216; The control end of A/D sampling and control panel 216 is connected with the control end that numerical-control attenuator 211 is entered in large stepping numerical-control attenuator 209, amplitude modulation(PAM) module 210 and small step, and data terminal is connected with control module 2 through monitoring cable.
Receiving antenna 201 receives from SAR radar transmitted pulse linear FM signal, and signal exports the input end of bandpass filter 203 to after input isolator 202 improves matching properties;
Bandpass filter 203 filterings receive the outer clutter of band of signal, and export the input end of directional coupler 204 to;
Directional coupler 204 make most signals directly by and export the input end of low noise amplifier 205 to, be coupled out in addition sub-fraction signal and by coupled end, export the input end of logarithmic detector amplifier 215 to;
Low noise amplifier 205 carries out first order low noise amplification by the signal receiving, and exports the input end of coaxial delay line 206 to;
Coaxial delay line 206 is carried out time delay by signal, and exports the input end of amplitude equalizer 207 to;
207 pairs of signals of amplitude equalizer are proofreaied and correct because of the amplitude distortion that time delay causes, and export the input end of small signal amplifier 208 to;
Small signal amplifier 208 carries out second level amplification by signal, compensates the signal power decay causing because of time delay, and exports the input end of large stepping numerical-control attenuator 209 to;
Large stepping numerical-control attenuator 209 carries out the quantitative decay of large stepping according to the numerical control value that A/D samples and control panel 216 is sent to signal, and exports the input end of amplitude modulation(PAM) module 210 to;
The frequency control word that amplitude modulation(PAM) module 210 is sent according to A/D sampling and control panel 216 produces voltage-controlled waveform, and voltage-controlled Waveform Control voltage controlled attenuator carries out corresponding sine amplitude modulation to signal, and exports small step to and enter numerical-control attenuator 211; In addition, amplitude modulation(PAM) module 210 is also responsible for monitoring system environment temperature, and temperature value is sent to A/D sampling and control panel 216.
Small step is entered numerical-control attenuator 211, according to the numerical control value that A/D samples and control panel 216 is sent, signal is carried out to corresponding trace decay, the change in gain causing because of variation of ambient temperature with bucking-out system, keeping system gain stabilization, and signal is exported to the input end of power amplifier 212;
Power amplifier 212 exports emitting antenna 214 to after signal is carried out to final stage power amplification and improves matching properties by output isolator 213, and by emitting antenna 214, signal is transmitted to SAR;
The signal that 215 pairs of directional couplers 204 of logarithmic detector amplifier are coupled out carries out amplitude detection, and the pulse envelope signal after detection is exported to the pulse signal input terminal of A/D sampling and control panel 216;
The pulse envelope signal that A/D sampling and control panel 216 are sent logarithmic detector amplifier 215 carries out A/D sampling, and sampled data is sent to control module 2 by monitoring cable; By serial communication, receive digital control signal, the modulation frequency signal from control module 2, after signal is changed, by control end, signal is entered to numerical-control attenuator 211 to large stepping numerical-control attenuator 209, amplitude modulation(PAM) module 210 and small step respectively and control.
As shown in Figure 4, figure comprises the structural principle block diagram of the control module 2 of broadband active transponder of the present invention:
PC104 industrial computer 31, high-speed data acquisition card 32, solid-state electronic dish 33, keyboard 34 and display 35, wherein, solid-state electronic dish 33, keyboard 34 and display 35 are connected respectively to standard interface corresponding on PC104 industrial computer 31; The pci bus interface of high-speed data acquisition card 32 is connected with the pci bus interface of PC104 industrial computer 31; The RS422 serial ports of PC104 industrial computer 31 and the data-interface of high-speed data acquisition card 32 are connected with the data terminal of A/D sampling and control panel 216 by monitoring cable.
The core controller that PC104 industrial computer 31 is whole system, by keyboard 34 input control parameters, PC104 industrial computer 31 sends to A/D sampling and control panel 216 by input parameter by RS422 serial ports, receives the Monitoring Data that A/D sampling and control panel 216 are sent simultaneously; A/D sampling and control panel 216 convert input parameter to corresponding controlled quentity controlled variable numerical-control attenuator, amplitude modulation(PAM) module are controlled.All controlled quentity controlled variables and monitoring variable export display 35 to by PC104 industrial computer 31 and show.
High-speed data acquisition card 32 receives the sampled data from A/D sampling and control panel 216 by differential data line, will after data buffer storage, packing, by pci bus, be sent to PC104 industrial computer 31 and is finally stored to solid-state electronic dish 33.
Below by specific embodiment, principle of work of the present invention is elaborated.
Broadband active repeater operation frequency range of the present invention is Ku wave band, centre frequency 14.8GHz, and bandwidth 3.2GHz, attainable maximum RCS is 40dBsm.
The present invention mainly consists of two parts, as shown in Figure 1, comprises Transmit-Receive Unit 1 and control module 2.Transmit-Receive Unit 1 mainly completes reception, amplification, modulation, coupling, detection, sampling, the forwarding to signal, and control module completes the power supply of Transmit-Receive Unit and parameter monitoring by power cable and monitoring cable.
The inner theory diagram of above-mentioned Transmit-Receive Unit as shown in Figure 3, wherein: receiving antenna 201 and emitting antenna 214 all adopt Ku wave band standard-gain horn antenna, antenna gain 20dBi, E face and H face 3dB beam angle are respectively 14 ° and 16 °; Input isolator 202 and output isolator 213 all adopt Ku band broadband isolator; Bandpass filter 203 is selected the cavity band-pass filter of centre frequency 14.8GHz, passband width 3.3GHz; Directional coupler 204 adopts the degrees of coupling to be-braodband directional coupler of 6dB; Low noise amplifier 205 adopts gain 40dB, the Ku band broadband low noise amplifier of noise figure 2.5dB; Coaxial delay line 206 is selected total delay amount 150ns; Equilibrium degree 12dB in amplitude equalizer 207 select tapes; Small signal amplifier 208 is selected gain 45dB, peak power output 10dBm; 4 of large stepping numerical-control attenuator 209 control bits; Amplitude modulation(PAM) module 210 modulating frequency 0-1000Hz; 7 of numerical-control attenuator 211 control bits are entered in small step; Power amplifier 212 is selected peak power output 25dBm; Logarithmic detector amplifier 215 is selected log slope 20mV/dR, maximum output pulse amplitude 2V.
During a kind of broadband active repeater operation of the present invention, first move broadband active transponder control program, display 35 display routine operation interfaces, by keyboard 34 input RCS settings, modulating frequency value, PC104 industrial computer 31 sends to A/D sampling and control panel 216 by input quantity by RS422 serial ports, A/D sampling and control panel 216 convert input quantity to control word numerical-control attenuator 209 and amplitude modulation(PAM) module 210 are controlled, simultaneously, constantly read the ambient temperature information that amplitude modulation(PAM) module 210 sends, and temperature is sent to PC104 industrial computer 31 by serial ports, control program sends the numerical control amount of numerical-control attenuator 211 according to the corresponding table of the temperature keeping in advance-damping capacity from trend A/D sampling and control panel 216, and sampled and 216 pairs of numerical-control attenuators 211 of control panel are controlled by A/D, thereby system-gain is constantly finely tuned with variation of ambient temperature, the stability that keeps full gain.After setting completed, broadband active transponder enters waiting status to parameter.When SAR flies over, broadband active transponder amplifies the signal receiving, postpone, decay, modulate and forwards on the one hand, by braodband directional coupler, signal coupling is gone out to a part of power on the other hand and carry out detection, the pulse envelope signal that detection goes out is delivered to A/D sampling and control panel 216 carries out A/D sampling, sampled data is sent to high-speed data acquisition card 32 by differential data line and carries out buffer memory, packing, by pci bus, transfer to PC104 industrial computer 31 again, data store in solid-state electronic dish 33 the most at last.
The power pack of a kind of broadband active transponder of the present invention is placed in control module, and power supply mode has 3 kinds:
1. carry storage battery power supply.Power pack is equipped with two groups of spirally wound lead acid batteries, every group of 12V, and two groups of series connection provide 24V direct current supply voltage, can maintain system works more than 2 hours.In addition, spirally wound lead acid battery has that volume is little, anti-vibration, high-low temperature resistant, the feature of can any direction placing, and is applicable to very much external field environment and uses.
2. outside direct current supply.External dc power input interface is provided, can directly with external dc power, have powered.
3. Alternating Current Power Supply.Power pack is equipped with AC/DC converter, can convert external communication 220 inputs to direct current 30V output, for whole system provides direct current supply, also can charge for accumulator simultaneously.
Above-mentioned three kinds of power supply modes are selected by switch, and 24V or 30V supply voltage change 12V and 5V DC voltage into again for system modules is powered by wide input range DC/DC module.
The structural design of a kind of broadband active transponder of the present invention is considered portability, and control module adopts the medium-sized portable sealed case of PELICAN1520, and display is installed on upper cover plate inner side, and keyboard, switch, pilot lamp and various interface are all installed on cabinet panel.PC104 industrial computer, high-speed data acquisition card and power pack are placed in cabinet inside, can be portable after cabinet closing lid.Transmit-Receive Unit all modules except dual-mode antenna are placed in shielding box, antenna is fixed through box body, fixed form can be that horizontal polarization can be also vertical polarization, and is connected with the radio frequency interface of box body by rigid coaxial cable, and box surface covers Ku wave band absorbing material.Shielding box is placed on turntable, to adjust antenna direction.Turntable can leveling, and orientation is to can 360 degree rotations, and pitching is 80 degree to adjustable angle scope.Transmit-Receive Unit packing adopts PELICAN0340 seal box, and this case band pulley and pull bar, conveniently transport and carry.
Claims (6)
1. a broadband active transponder, is characterized in that, comprises Transmit-Receive Unit and control module, and Transmit-Receive Unit monitor-interface is connected with control module monitor-interface by monitoring cable, and Transmit-Receive Unit power supply interface is connected with control module power supply interface by power cable; Transmit-Receive Unit is for carrying out filtering, amplification, delay and modulation treatment by signal, and then signal is transmitted to radar, simultaneously to signal be coupled, detection and sampling; Control module is for the running parameter of Transmit-Receive Unit is controlled, and the duty of monitoring Transmit-Receive Unit, receives and record the sampled data that Transmit-Receive Unit is sent;
Wherein, described Transmit-Receive Unit comprises receiving antenna, signal processing module and emitting antenna, and receiving antenna is electrically connected to signal processing module input end, and emitting antenna is electrically connected to signal processing module output terminal; Receiving antenna is for receiving the pulse signal of SAR transmitting; Signal processing module is for carrying out to the received signal filtering, amplification, delay and modulation treatment, simultaneously to signal be coupled, detection and sampling; Emitting antenna is for being transmitted to SAR by the signal after processing;
Described signal processing module comprises input isolator, bandpass filter, directional coupler, low noise amplifier, coaxial delay line, amplitude equalizer, small signal amplifier, numerical-control attenuator, power amplifier, output isolator, logarithmic detector amplifier, A/D sampling and control panel are entered in stepping numerical-control attenuator, amplitude modulation(PAM) module, small step greatly; Wherein, input isolator, bandpass filter, directional coupler, low noise amplifier, coaxial delay line, amplitude equalizer, small signal amplifier, large stepping numerical-control attenuator, amplitude modulation(PAM) module, small step are entered numerical-control attenuator, power amplifier and output isolator and are sequentially connected in series successively; The coupled end of directional coupler is electrically connected to the pulse signal input terminal of A/D sampling and control panel through logarithmic detector amplifier, the control end that the control end of A/D sampling and control panel enters numerical-control attenuator with large stepping numerical-control attenuator, amplitude modulation(PAM) module, small step is respectively electrically connected to, and both-way communication; The data terminal of A/D sampling and control panel is connected with control module through monitoring cable.
2. broadband active transponder as claimed in claim 1, is characterized in that, described receiving antenna, emitting antenna are Ku wave band standard-gain horn antenna.
3. broadband active transponder as claimed in claim 1, is characterized in that, described control module comprises microcomputer system, high-speed data acquisition card, solid-state electronic dish, keyboard, display; Microcomputer system, is electrically connected to high-speed data acquisition card, solid-state electronic dish, keyboard, display respectively, and both-way communication;
In microcomputer system, copy broadband active transponder and controlled software;
The RS422 serial ports of microcomputer system, the interface of high-speed data acquisition card are electrically connected to the data terminal of A/D sampling and control panel through monitoring cable respectively, and both-way communication.
4. broadband active transponder as claimed in claim 3, is characterized in that, described microcomputer system is PC104 industrial computer.
5. the broadband active transponder as described in claim 1,3 or 4, is characterized in that, its workflow is:
A) receiving antenna receives the pulse signal of SAR transmitting, through input isolator, is transferred to signal processing module;
B) signal processing module is done following flow process:
Bandpass filter filtering receives the outer clutter of band of signal; Directional coupler directly passes through most of signal, and sub-fraction power coupling output is used for to detection below; Low noise amplifier carries out first order low noise amplification by the signal receiving; Coaxial delay line is carried out time delay by the signal receiving; The amplitude distortion that amplitude equalizer causes coaxial delay line compensates; Small signal amplifier, carries out second level amplification by the signal receiving, the decay that compensating coaxial lag line causes; Large stepping numerical-control attenuator carries out larger quantitative decay to signal, adjustment System gain; Amplitude modulation(PAM) module is carried out sine amplitude modulation to the received signal, ambient temperature information is sent to A/D sampling and control panel simultaneously; Small step is entered numerical-control attenuator system-gain is carried out to trace adjustment, the system-gain variation that compensation causes because of variation of ambient temperature, the stability of keeping system gain; Logarithmic detector amplifier carries out amplitude detection to the signal of directional coupler coupling output; The SAR pulse envelope signal that A/D sampling and control panel go out detection carries out A/D sampling, and gives control module by sampling data transmitting, completes the control that large stepping numerical-control attenuator, amplitude modulation(PAM) module, small step are entered to numerical-control attenuator simultaneously;
C) on PC104 industrial computer, move broadband active transponder and control software, whole active transponder is controlled and monitored;
D) during running software, by keyboard input control parameter, to PC104 industrial computer, computing machine sends to A/D sampling and control panel by RS422 serial communication by instruction, and receives the monitoring information that A/D sampling and control panel transmit;
E) display shows broadband active transponder control software interface, facilitates man-machine interaction;
F) high-speed data acquisition card, carries out buffer memory, processing the sampled data that A/D samples and control panel passes over, and send PC104 industrial computer, and be stored to solid-state electronic dish by pci bus;
G) power amplifier carries out after final stage power amplification the signal of handling well, through output isolator, by emitting antenna, is transmitted to radar.
6. broadband active transponder as claimed in claim 1, is characterized in that, described small signal amplifier is the amplifier of peak power output 10dBm; Large stepping numerical-control attenuator is 3dB stepping numerical-control attenuator; It is 0.2dB stepping numerical-control attenuator that numerical-control attenuator is entered in small step.
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| WO2020103153A1 (en) * | 2018-11-23 | 2020-05-28 | 华普特科技（深圳）股份有限公司 | Radio signal transfer method and transfer apparatus |
| CN109756691B (en) * | 2018-11-30 | 2020-12-29 | 宁波环球广电科技有限公司 | General high-precision electronic control balance compensation device |
| CN110794376B (en) * | 2019-12-16 | 2021-11-05 | 北京宏动科技有限公司 | Ultra-wideband impulse radar receiver sensitivity measuring technology |
| CN111273242B (en) * | 2020-03-05 | 2022-05-03 | 北京环境特性研究所 | Unmanned helicopter-mounted electromagnetic active calibration equipment, system and method |
| CN111664740B (en) * | 2020-05-28 | 2023-01-17 | 中国人民解放军32181部队 | Passive microwave communication adapter and system |
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| CN103018724A (en) | 2013-04-03 |
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