CN103018724A - Active transponder for broadband - Google Patents
Active transponder for broadband Download PDFInfo
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- CN103018724A CN103018724A CN2011102808368A CN201110280836A CN103018724A CN 103018724 A CN103018724 A CN 103018724A CN 2011102808368 A CN2011102808368 A CN 2011102808368A CN 201110280836 A CN201110280836 A CN 201110280836A CN 103018724 A CN103018724 A CN 103018724A
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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 the microwave remote sensing technique field, particularly be 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 tracts of land remotely sensed image, and its view data has been brought into play great function in geology, agricultural, the hydrology, forestry, ocean, Cartography, military surveillance and the fields such as target identification and information extraction.Early stage SAR uses and mainly concentrates on qualitative remote sensing aspect, be Main Basis be the information such as position, shape and echo power that the 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 the scattering coefficient.Determining of this quantitative relationship finished by the SAR radiation calibration.The SAR radiation calibration is exactly that radar cross section (RCS) to this resolution element of the gray-scale value representative of each pixel in the radar image carries out accurate and correct mensuration.International SAR system, such as ERS-1, SIR-C, X-SAR and RADARSAT etc. have adopted the 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 about 1m, 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, and having obtained resolution is the image of 3-0.5m.
SAR is carried out the targeting device that radiation calibration need to be used the 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 the rate-aided signal, so that the radiation calibration precision reduces greatly.By contrast, active transponder is simulated terrain object by the SAR signal is received, amplifies, transmits, and its RCS is no longer dependent on physical size, but only relevant with the gain of amplifying link.In addition, the processing such as active transponder can also be delayed time the signal that receives, modulation so that rate-aided signal and background clutter signal break away from correlativity, thereby improve the precision of radiation calibration, satisfy the radiation calibration requirement of high resolution synthetic aperture radar.
Summary of the invention
The purpose of this invention is to provide a kind of broadband active transponder, overcome the deficiency of passive targeting device in the high resolution synthetic aperture radar radiation calibration, simulate terrain object by receiving, amplify, transmit the SAR signal, thereby realize larger and accurate, adjustable radar cross section; Before transmitting, can delay time and the sine amplitude modulation to signal, so that rate-aided signal and background clutter signal are eliminated correlativity, improve the precision of radiation calibration; Can carry out to the received signal amplitude detection, and rectified signal is sampled and record, help the SAR antenna radiation pattern is analyzed.In addition, a kind of broadband active transponder of the present invention also have power supply mode flexibly, the characteristics 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 kind of broadband active transponder, it comprises Transmit-Receive Unit and control module, and the Transmit-Receive Unit monitor-interface is connected with the control module monitor-interface by the monitoring cable, and the Transmit-Receive Unit power supply interface is connected with the control module power supply interface by power cable; The major function of Transmit-Receive Unit is signal to be carried out the processing such as filtering, amplification, delay, modulation, and then signal is transmitted to radar, simultaneously to signal be coupled, detection and sampling; The 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, its described Transmit-Receive Unit comprises receiving antenna, signal processing module, emitting antenna, and receiving antenna is electrically connected with the signal processing module input end, and emitting antenna is electrically connected with the 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 with the signal after processing.
Described broadband active transponder, its described receiving antenna, emitting antenna are Ku wave band standard-gain horn antenna.
Described broadband active transponder, its described signal processing module 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 advance 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 advanced numerical-control attenuator, power amplifier, output isolator and sequentially are connected in series successively;
The coupled end of directional coupler is electrically connected through the pulse signal input terminal of logarithmic detector amplifier with A/D sampling and control panel, the control end of A/D sampling and control panel is electrically connected with the control end that numerical-control attenuator is advanced in large stepping numerical-control attenuator, amplitude modulation(PAM) module, small step respectively, and both-way communication; The data terminal of A/D sampling and control panel links to each other with control module through the monitoring cable.
Described broadband active transponder, its described control module comprises microcomputer system, high-speed data acquisition card, solid-state electronic dish, keyboard, display; Microcomputer system is electrically connected with high-speed data acquisition card, solid-state electronic dish, keyboard, display respectively, and both-way communication;
Copied broadband active transponder control software in the microcomputer system;
The RS422 serial ports of microcomputer system, the interface of high-speed data acquisition card are electrically connected through the data terminal of monitoring cable with A/D sampling and control panel respectively, and both-way communication.
Described broadband active transponder, its described microcomputer system is the PC104 industrial computer.
Described broadband active transponder, its flow process is:
A) receiving antenna receives the pulse signal that SAR launches, and is transferred to signal processing module through input isolator;
B) signal processing module is done following flow process:
The bandpass filter filtering receives the outer clutter of band of signal; Directional coupler directly passes through most of signal, sub-fraction power coupling output is used for the detection of back; Low noise amplifier carries out first order low noise amplification with the signal that receives; Coaxial delay line is delayed time the signal that receives; Amplitude equalizer compensates the amplitude distortion that coaxial delay line causes; Small signal amplifier carries out the second level with the signal that receives and amplifies the decay that the compensating coaxial lag line causes; Large stepping numerical-control attenuator carries out larger quantitative decay to signal, the Adjustment System gain; The amplitude modulation(PAM) module is carried out the sine amplitude modulation to the received signal, simultaneously ambient temperature information is sent to A/D sampling and control panel; Small step is advanced numerical-control attenuator system-gain is carried out trace adjustment, and compensation changes because of the system-gain that variation of ambient temperature causes, the stability of keeping system gain; The 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 the A/D sampling, and gives control module with sampling data transmitting, finishes simultaneously the control that numerical-control attenuator is advanced in large stepping numerical-control attenuator, amplitude modulation(PAM) module, small step;
C) at PC104 industrial computer operation broadband active transponder control software, whole active transponder is controlled and monitored;
D) during running software, to the PC104 industrial computer, computing machine sends to A/D sampling and control panel by the RS422 serial communication with instruction by keyboard input control parameter, and receives the monitoring information that A/D sampling and control panel transmit;
E) display shows broadband active transponder control software interface, makes things convenient for man-machine interaction;
F) high-speed data acquisition card carries out buffer memory, processing to the sampled data that A/D samples and control panel passes over, and send the PC104 industrial computer by pci bus, and is stored to the solid-state electronic dish;
G) after power amplifier carries out the final stage power amplification to the signal of handling well, through the output isolator, be transmitted to radar by emitting antenna.
Described broadband active transponder, its described small signal amplifier is the amplifier of peak power output 10dBm; Large stepping numerical-control attenuator is 3db stepping numerical-control attenuator; Numerical-control attenuator is advanced in small step, is 0.2db stepping numerical-control attenuator.
Good effect of the present invention is:
1) owing to transmit again after adopting amplifier to amplify to the received signal, can in the situation of transponder constancy of volume, realize larger RCS.
2) owing to adopt numerical-control attenuator that system-gain is regulated, can realize multiple different RCS.
3) in real time system-gain is compensated decay with the keeping system gain stabilization owing to adopt small step to advance numerical-control attenuator according to the system environments temperature variation, improved the degree of accuracy of broadband active transponder RCS.
4) owing to adopted time-delay and amplitude modulation technique, so that be forwarded signal and background clutter signal disengaging correlativity that device is transmitted, adopt corresponding rate-aided signal disposal route to disturb by the establishment background clutter, improve the radiation calibration precision.
5) because the SAR pulse signal that receives is carried out envelope detection and sample record, thereby can analyze to directional diagram SAR antenna bearingt by the data of recording.
Description of drawings
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 among 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 the amplitude modulation(PAM) module, and 211 advance numerical-control attenuator for small step, 212 is power amplifier, and 213 are the output isolator, and 214 is emitting antenna, 215 is logarithmic detector, and 216 are A/D sampling and control module.
Fig. 4 is the structural principle block diagram of the control module that relates among the present invention; Wherein, 31 is the PC104 industrial computer, and 32 is high-speed data acquisition card, and 33 is the solid-state electronic dish, and 34 is keyboard, and 35 is display.
Embodiment
A kind of broadband active transponder of the present invention, its structured flowchart as shown in Figure 1, its structural principle block diagram is as shown in Figure 2.Comprise among Fig. 1: Transmit-Receive Unit 1, control module 2.Wherein, the monitor-interface of Transmit-Receive Unit 1 passes through the monitor-interface connection that the monitoring cable is connected with control module; The power supply interface of Transmit-Receive Unit 1 is connected by the power supply interface of power cable with control module 2.The major function of Transmit-Receive Unit 1 is signal to be carried out 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.
The structural principle block diagram of the Transmit-Receive Unit 1 of broadband active transponder of the present invention comprises among the figure as shown in Figure 3:
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 advanced 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 the 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;
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;
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 advance numerical-control attenuator 211; In addition, amplitude modulation(PAM) module 210 also is responsible for the monitoring system environment temperature, and temperature value is sent to A/D sampling and control panel 216.
Small step is advanced numerical-control attenuator 211 and according to the numerical control value that A/D samples and control panel 216 is sent signal is carried out corresponding trace decay, the change in gain that causes because of variation of ambient temperature with bucking-out system, the keeping system gain stabilization, and signal is exported to the input end of power amplifier 212;
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 the 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 the A/D sampling, and sampled data is sent to control module 2 by the monitoring cable; Receive digital control signal, modulation frequency signal from control module 2 by serial communication, by control end signal is advanced numerical-control attenuator 211 to large stepping numerical-control attenuator 209, amplitude modulation(PAM) module 210 and small step respectively after signal is changed and control.
The structural principle block diagram of the control module 2 of broadband active transponder of the present invention comprises among the figure as shown in Figure 4:
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 the 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 by the data terminal of monitoring cable with A/D sampling and control panel 216.
PC104 industrial computer 31 is the core controller of whole system, by keyboard 34 input control parameters, PC104 industrial computer 31 sends to A/D sampling and control panel 216 with input parameter by the RS422 serial ports, receives simultaneously the Monitoring Data that A/D sampling and control panel 216 are sent; 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 sampled data from A/D sampling and control panel 216 by differential data line, will data buffer storage, send to PC104 industrial computer 31 and finally be stored to solid-state electronic dish 33 by pci bus after the packing.
Below by specific embodiment principle of work of the present invention is elaborated.
Broadband active repeater operation frequency range of the present invention is the Ku wave band, centre frequency 14.8GHz, and bandwidth 3.2GHz, attainable maximum RCS is 40dBsm.
The present invention mainly is made of two parts, as shown in Figure 1, comprises Transmit-Receive Unit 1 and control module 2.Transmit-Receive Unit 1 is mainly finished reception, amplification, modulation, coupling, detection, sampling, the forwarding to signal, and control module is finished power supply and parameter monitoring to Transmit-Receive Unit 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 advanced 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, at first move broadband active transponder control program, display 35 display routine operation interfaces, by keyboard 34 input RCS settings, the modulating frequency value, PC104 industrial computer 31 sends to A/D sampling and control panel 216 with input quantity by the 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 sent to PC104 industrial computer 31 by serial ports, control program sends the numerical control amount of numerical-control attenuator 211 from trend A/D sampling and control panel 216 according to the corresponding table of the temperature that keeps in advance-damping capacity, and controlled by A/D sampling and 216 pairs of numerical-control attenuators 211 of control panel, thereby so that system-gain is constantly finely tuned with variation of ambient temperature, keep the stability of full gain.Parameter after setting completed, the broadband active transponder enters waiting status.When SAR flies over, the broadband active transponder amplifies the signal that receives, postpone, decay, modulate and transmits on the one hand, by braodband directional coupler signal coupling is gone out a part of power on the other hand and carry out detection, the pulse envelope signal that detection goes out delivers to the A/D sampling and control panel 216 carries out the A/D sampling, sampled data is sent to high-speed data acquisition card 32 by differential data line and carries out buffer memory, packing, transfer to PC104 industrial computer 31 by pci bus again, data store in the solid-state electronic dish 33 the most at last.
The power pack of a kind of broadband active transponder of the present invention places 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 keep system works more than 2 hours.In addition, but the characteristics that spirally wound lead acid battery has that volume is little, anti-vibration, high-low temperature resistant any direction are placed are fit to external field environment and use very much.
2. outside direct current supply.The external dc power input interface is provided, can have directly powered with external dc power.
3. Alternating Current Power Supply.Power pack is equipped with the 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 into by wide input range DC/DC module and the 5V DC voltage is powered for system's modules again.
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 the upper cover plate inboard, and keyboard, switch, pilot lamp and various interface all are installed on the cabinet panel.PC104 industrial computer, high-speed data acquisition card and power pack place cabinet inside, can be portable after the cabinet closing lid.Transmit-Receive Unit all modules except dual-mode antenna place shielding box, antenna passes box body and fixes, fixed form can be that horizontal polarization also can be 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 places on the turntable, in order to adjust antenna direction.Turntable can leveling, and the orientation is to can 360 degree rotations, and pitching is 80 degree to the adjustable angle scope.The Transmit-Receive Unit packing adopts the PELICAN0340 seal box, and this case band pulley and pull bar conveniently transport and carry.
Claims (8)
1. a broadband active transponder is characterized in that, comprises Transmit-Receive Unit and control module, and the Transmit-Receive Unit monitor-interface is connected with the control module monitor-interface by the monitoring cable, and the Transmit-Receive Unit power supply interface is connected with the control module power supply interface by power cable; The major function of Transmit-Receive Unit is signal to be carried out the processing such as filtering, amplification, delay, modulation, and then signal is transmitted to radar, simultaneously to signal be coupled, detection and sampling; The 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.
2. broadband active transponder as claimed in claim 1, it is characterized in that, described Transmit-Receive Unit comprises receiving antenna, signal processing module, emitting antenna, and receiving antenna is electrically connected with the signal processing module input end, and emitting antenna is electrically connected with the 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 with the signal after processing.
3. broadband active transponder as claimed in claim 2 is characterized in that, described receiving antenna, emitting antenna are Ku wave band standard-gain horn antenna.
4. broadband active transponder as claimed in claim 2, it is characterized in that, described signal processing module 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 advance 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 advanced numerical-control attenuator, power amplifier, output isolator and sequentially are connected in series successively;
The coupled end of directional coupler is electrically connected through the pulse signal input terminal of logarithmic detector amplifier with A/D sampling and control panel, the control end of A/D sampling and control panel is electrically connected with the control end that numerical-control attenuator is advanced in large stepping numerical-control attenuator, amplitude modulation(PAM) module, small step respectively, and both-way communication; The data terminal of A/D sampling and control panel links to each other with control module through the monitoring cable.
5. such as claim 1 or 4 described broadband active transponders, it 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 with high-speed data acquisition card, solid-state electronic dish, keyboard, display respectively, and both-way communication;
Copied broadband active transponder control software in the microcomputer system;
The RS422 serial ports of microcomputer system, the interface of high-speed data acquisition card are electrically connected through the data terminal of monitoring cable with A/D sampling and control panel respectively, and both-way communication.
6. broadband active transponder as claimed in claim 5 is characterized in that, described microcomputer system is the PC104 industrial computer.
7. such as claim 4,5 or 6 described broadband active transponders, it is characterized in that its workflow is:
A) receiving antenna receives the pulse signal that SAR launches, and is transferred to signal processing module through input isolator;
B) signal processing module is done following flow process:
The bandpass filter filtering receives the outer clutter of band of signal; Directional coupler directly passes through most of signal, sub-fraction power coupling output is used for the detection of back; Low noise amplifier carries out first order low noise amplification with the signal that receives; Coaxial delay line is delayed time the signal that receives; Amplitude equalizer compensates the amplitude distortion that coaxial delay line causes; Small signal amplifier carries out the second level with the signal that receives and amplifies the decay that the compensating coaxial lag line causes; Large stepping numerical-control attenuator carries out larger quantitative decay to signal, the Adjustment System gain; The amplitude modulation(PAM) module is carried out the sine amplitude modulation to the received signal, simultaneously ambient temperature information is sent to A/D sampling and control panel; Small step is advanced numerical-control attenuator system-gain is carried out trace adjustment, and compensation changes because of the system-gain that variation of ambient temperature causes, the stability of keeping system gain; The 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 the A/D sampling, and gives control module with sampling data transmitting, finishes simultaneously the control that numerical-control attenuator is advanced in large stepping numerical-control attenuator, amplitude modulation(PAM) module, small step;
C) at PC104 industrial computer operation broadband active transponder control software, whole active transponder is controlled and monitored;
D) during running software, to the PC104 industrial computer, computing machine sends to A/D sampling and control panel by the RS422 serial communication with instruction by keyboard input control parameter, and receives the monitoring information that A/D sampling and control panel transmit;
E) display shows broadband active transponder control software interface, makes things convenient for man-machine interaction;
F) high-speed data acquisition card carries out buffer memory, processing to the sampled data that A/D samples and control panel passes over, and send the PC104 industrial computer by pci bus, and is stored to the solid-state electronic dish;
G) after power amplifier carries out the final stage power amplification to the signal of handling well, through the output isolator, be transmitted to radar by emitting antenna.
8. broadband active transponder as claimed in claim 4 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; Numerical-control attenuator is advanced in small step, is 0.2dB stepping numerical-control attenuator.
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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 |
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| CN111664740A (en) * | 2020-05-28 | 2020-09-15 | 中国人民解放军32181部队 | Passive microwave communication adapter and system |
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| CN109782237B (en) * | 2017-11-10 | 2022-05-06 | 北京航天万源科技有限公司 | Radar simulated echo and interference signal measuring device |
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| CN109756691A (en) * | 2018-11-30 | 2019-05-14 | 宁波环球广电科技有限公司 | A kind of automatically controlled equalization compensation device of general purpose type high accuracy |
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| CN110794376A (en) * | 2019-12-16 | 2020-02-14 | 北京宏动科技有限公司 | Ultra-wideband impulse radar receiver sensitivity measuring technology |
| CN111273242A (en) * | 2020-03-05 | 2020-06-12 | 北京环境特性研究所 | Unmanned helicopter-mounted electromagnetic active calibration equipment, system and method |
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| CN111664740A (en) * | 2020-05-28 | 2020-09-15 | 中国人民解放军32181部队 | Passive microwave communication adapter and system |
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