CN103018731B - A kind of RF hardware time domain gate circuit based on narrow pulse modulator - Google Patents
A kind of RF hardware time domain gate circuit based on narrow pulse modulator Download PDFInfo
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Abstract
The present invention proposes a kind of RF hardware time domain gate circuit based on narrow pulse modulator, by taking into account the pass-band performance of higher time resolution, preferably time-domain filtering effect and excellence, finally reach and effectively suppress environment noise jamming, improve the object of rcs measurement precision.Based on a RF hardware time domain gate circuit for narrow pulse modulator, comprising: multiplex pulse baseband signal generation module, produce the first baseband signal and the second baseband signal, the second baseband signal is benchmark with the first baseband signal, generates through time delay; First narrow pulse modulator, the continuous wave signal that received RF signal source produces, is modulated by described first baseband signal, exports pulse-modulated signal, and is sent by complete machine emission port; Second narrow pulse modulator, receive the echoed signal through amplifying, its break-make moment is controlled by described second baseband signal, exports target area signal.
Description
Technical field
The present invention relates to Radar Technology field, particularly a kind of RF hardware time domain gate circuit based on narrow pulse modulator.
Background technology
RCS is the physical quantity of quantitatively characterizing target to radar illumination scattering of wave power.Along with the fast development of electronic warfare, the extensive use of Stealth weapons becomes a notable feature of modern war.Stealth technology can effectively reduce the distance that radar finds target, becomes the important means strengthening assault ability or protect self.The Stealth Fighter of target depends primarily on the size of its RCS (RadarCross-Section, RCS), thus reducing radar scattering cross section in various ways, just becomes the main target of research stealth technology.Along with the development of stealth technology, the RCS characteristic of various stealthy equipment also becomes the order of magnitude to decline, this, just for the RCS measuring technology run through in equipment preparation, production and process of the test proposes new challenge, requires that RCS test macro has less RCS power of test, higher measuring accuracy and accuracy.
For low scattering RCS test macro, in space enrironment, the impact of various reflection interference is the key factor causing RCS test error.The time domain distribution situation of each prominent echo received under Figure 1 shows that typical Compact Range test environment, comprises transmitting-receiving leakage signal 15, reflecting surface echoed signal 16, feed echoed signal 17, target echo signal 18 and rear wall reflected signal 19.Can be seen by Fig. 1, for little RCS value target, the strong reflection in place will be more much bigger than target echo signal.In order to accurate receiving target echoed signal, just needing adopts various measures suppresses strongly disturbing impact, and traditional disposal route mainly comprises software time domain gate technique and intermediate frequency hardware time domain gate technique.
Software time domain gate technique is a kind of effective way effectively can removing some undesired signals can separated in distance, its principle is that system carries out swept continuous wave test, by obtaining amplitude and the phase data of frequency domain echo signal under certain frequency span, then carry out the time-domain curve that inverse Fourier transform can obtain receiving echoed signal.Add door for software time domain, be multiplied by a window function in fact exactly in time domain to data, by time domain, we wish that other data obtained outside data are blocked, and only retain the data of software door inside.For software time domain gate technique, its time resolution only homologous ray swept bandwidth is inversely proportional to, and therefore can improve time resolution by increasing swept bandwidth, having good time domain resolving effect, can be used for removing the nearer various undesired signals of distance objective.
As shown in Figure 2, intermediate frequency time domain gate technique is that systems radiate goes out pulse-modulated signal, this signal arrives receiver after target reflection, echoed signal is amplified through amplifier 201 radio frequency door time domain by receiver, again by obtaining intermediate-freuqncy signal after frequency mixer 202 and local oscillation signal 203 mixing, by increasing gate controlled switch 204 in intermediate-freuqncy signal, the break-make moment controlling receiver intermediate-freuqncy signal realizes only allowing useful intermediate-freuqncy signal pass through and suppress undesired signal, and then reaches the object of filtering interference signals in time domain.Because the on-off ratio characteristic of intermediate frequency gate controlled switch is better, therefore good time domain hardware filtering effect can be reached for the various interference that distance objective in time domain is far away.
For software time domain door, what adopt is the artificial intercepting that the method for mathematical operation realizes time domain data, although the method has good time resolution, but this truncation effect by means of only software processes will inevitably cause error, show that frequency domain is exactly gibbs (Gibbs) effect, this effect causes the fluctuation in passband and stopband, has certain ripple exactly corresponding to window function in passband, and the attenuation characteristic simultaneously in stopband is also limited.Particularly when undesired signal is much larger than target echo signal, removal effect is unsatisfactory, will cause comparatively big error to result.
For intermediate frequency hardware time domain door, because gate controlled switch is placed in intermediate frequency path, and IF-FRE is lower, and therefore intermediate-frequency bandwidth is limited, this enough narrow, shortcoming such as time resolution is poor of just causing gate-width degree to arrange.This shortcoming causes the various undesired signals of same target echo close together effectively to remove, and the practicality of technology is not strong.
Summary of the invention
The present invention proposes a kind of RF hardware time domain gate circuit based on narrow pulse modulator, by taking into account the pass-band performance of higher time resolution, preferably time-domain filtering effect and excellence, finally reach and effectively suppress environment noise jamming, improve the object of rcs measurement precision.
Technical scheme of the present invention is achieved in that
Based on a RF hardware time domain gate circuit for narrow pulse modulator, comprising: multiplex pulse baseband signal generation module, produce the first baseband signal and the second baseband signal, the second baseband signal is benchmark with the first baseband signal, generates through time delay; First narrow pulse modulator, the continuous wave signal that received RF signal source produces, is modulated by described first baseband signal, exports pulse-modulated signal, and is sent by complete machine emission port; Second narrow pulse modulator, receive the echoed signal through amplifying, its break-make moment is controlled by described second baseband signal, exports target area signal.
Alternatively, described multiplex pulse baseband signal generation module comprises FPGA circuit and external circuit, and FPGA circuit completes baseband signal cycle, the counting of pulsewidth and minute adjustment, and produces baseband signal, and external circuit completes the Shape correction of pulse along characteristic.
Alternatively, described FPGA circuit comprises: clock module, for all counters and precise regulation circuit provide public reference clock; First counter, this counter is period counter, and the PRT according to default produces periodic signal, and this periodic signal is as the enabling signal of two-way pulse below; Second counter and the first precise regulation circuit, produce with described periodic signal be the cycle, pulse width meet setting require baseband signal; 3rd counter, the second precise regulation circuit, four-counter and the 3rd precise regulation circuit, wherein the 3rd counter and the second precise regulation circuit are delays time to control part, four-counter and the 3rd precise regulation circuit are pulse width control part, produce with described periodic signal be the cycle, pulse delay value and pulse width meet the baseband signal that setting requires.
Alternatively, described external circuit comprises the first pulse shaping circuit and the second pulse shaping circuit, first pulse shaping circuit receives the baseband signal that described first precise regulation circuit exports, and sends described first baseband signal after paired pulses carries out Shape correction along characteristic by the first coaxial fitting; Second pulse shaping circuit receives the baseband signal that described 3rd precise regulation circuit exports, and sends described second baseband signal after paired pulses carries out Shape correction along characteristic by the second coaxial fitting.
Alternatively, described narrow pulse modulator comprises rf inputs mouth, radio frequency output port and Puled input port, microwave signal is inputted by rf inputs mouth and exports from radio frequency output port, and pulsed base band signal is inputted by Puled input port, and pulsed base band signal is modulated to microwave signal.
Alternatively, described narrow pulse modulator comprises microwave portions and driving circuit section, is connected between the two by feedthrough capacitor.
Alternatively, the microwave portions of described narrow pulse modulator comprises the single-pole double-throw switch (SPDT) of microwave FET form, and wherein, 1 pin is radio frequency input pin; 2 pin are output 1, export for radio frequency; 3 pin are output 2, by build-out resistor ground connection.
Alternatively, the driving circuit section of described narrow pulse modulator comprises high-speed comparator and three road high-speed-differential amplifiers, high-speed comparator receives the switch on and off gating pulse of Transistor-Transistor Logic level, pulse signal is carried out Shape correction and improves driving force, pulse signal after process is divided into 3 tunnels and delivers to three road high-speed-differential amplifiers respectively, and the conversion that high-speed-differential amplifier realizes signal single-ended-to-difference realizes the control to microwave switch afterwards.
Alternatively, the positive and negative end of described single-pole double-throw switch (SPDT) is the control port of switch, and this port is by being connected to the output terminal of described high-speed-differential amplifier to ground matching capacitance and feedthrough capacitor.
The invention has the beneficial effects as follows:
(1) gate ability is strong: due to gating circuit is advanced to Microwave Path by intermediate frequency path, avoid the restriction of intermediate-frequency bandwidth to burst pulse ability, burst pulse ability can be risen to 8ns by the 16.7ns of intermediate frequency gating technology, thus realize stronger interference removal ability;
(2) gate resolution is high: have employed the high precision delay technique based on FPGA, gate resolution can be brought up to 0.1ns, radio frequency door position is arranged more accurate;
(3) gate is effective: the radio frequency narrow pulse modulator design proposal based on 3 grades of switch series connection and distributed type of drive ensure that the pulse switch ratio being better than 70dB, can provide outstanding gate effect;
(4) volume structure is small and exquisite, applying flexible: adopt microwave narrow pulse modulator module to coordinate the pulse base band based on FPGA to produce circuit realiration radio frequency time domain gate technique, there is compact, version independently feature, under the prerequisite not changing traditional width phase transceiver version and working method, only need increase the present invention in Microwave Path, the application of radio frequency time domain door can be realized.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the time domain distribution plan of each prominent echo received under typical Compact Range test environment;
Fig. 2 is the schematic diagram that circuit is removed in the noise jamming of intermediate frequency door;
Fig. 3 is the control block diagram of the RF hardware time domain gate circuit that the present invention is based on narrow pulse modulator;
Fig. 4 is the circuit block diagram of multiplex pulse baseband signal generation module in Fig. 3;
Fig. 5 is pulse baseband signal waveform schematic diagram in Fig. 3;
Fig. 6 is the circuit block diagram of narrow pulse modulator in Fig. 3;
Fig. 7 is the echo time domain design sketch after the RF hardware time domain gate circuit process that the present invention is based on narrow pulse modulator.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The invention discloses a kind of RF hardware time domain gate circuit based on narrow pulse modulator, in RCS test process, dual-mode antenna coupling, the reflection of space enrironment, turntable and the various reflected signal such as the reflection of Metal pylon, the impact of multipath reflection are all along with the reflected signal of target arrives receiver, the moment arriving receiver due to these reflected signals is different, and time domain gate technique therefore can be utilized to carry out the unwanted time-domain signal of filtering and only retain target echo.The present invention is by increasing narrow microwave pulse modulator in the microwave channel front end of receiving cable, gate controlled switch position is changed to Microwave Path by intermediate frequency path, can cancellation band tolerance system, greatly raising burst pulse ability, the finally more high-precision noise jamming removal ability of realization.
Fig. 3 is the overall control block diagram of a kind of RF hardware time domain gate circuit based on narrow pulse modulator of the present invention, specifically describe as follows: whole embodiment completes in an integrated width Phase Receiver equipment, in tradition integrated width phase transceiver, add RF hardware time domain gate circuit 20 as shown in Figure 3.Radio-frequency signal source 1 produces continuous wave signal, this signal delivers to the switch module of the first narrow pulse modulator 2, simultaneously multiplex pulse baseband signal generation module 7 produces pulsewidth, narrow pulse signal that the cycle is adjustable, i.e. the first baseband signal 11, first narrow pulse modulator 2 is modulated, obtain pulse-modulated signal, and sent by complete machine emission port 3; The echoed signal received sends into receiver by complete machine receiving port 4, the radio frequency door be made up of the second narrow pulse modulator 22 is admitted to after amplifier 5 amplifies, now multiplex pulse baseband signal generation module 7 produces the second baseband signal 12, second baseband signal 12 with the first baseband signal 11 for benchmark, generate through delay operation, pulsewidth is accurately adjustable, this signal controls the break-make moment of the second narrow pulse modulator 22 as gate-control signal, realizes the object only retaining target area signal and filtering interference signals; Signal after the second narrow pulse modulator 22 time-domain filtering is admitted to frequency mixer 6, carry out mixing with local oscillation signal 8, obtain intermediate-freuqncy signal, this signal is sent in adc circuit 9 and is carried out quantizing and Digital IF Processing after intermediate frequency filtering, the information of target to be measured can be obtained, complete test processes work.
What Figure 4 shows that multiplex pulse baseband signal generation module in Fig. 3 realizes block diagram, utilize the high delay resolution feature of the dirigibility of FPGA internal build counter and precision time delay unit, the multiplex pulse baseband signal of cycle, pulsewidth and time delay controllable precise can be produced.In the diagram, multiplex pulse baseband signal generation module comprises FPGA circuit 701 and external circuit 702 two parts, FPGA circuit 701 part completes the major function such as counting and minute adjustment of baseband signal cycle, pulsewidth, and producing baseband signal, external circuit 702 mainly realizes the Shape correction of pulse along characteristic.Clock module 708 produces the clock signal of 200MHz, and this signal provides public reference clock for all counters and precise regulation circuit; First counter 703 is period counter, and this counter produces periodic signal START according to the PRT of default, and this signal is as the enabling signal of two-way pulse below; According to the requirement of system first baseband signal 11 pulse width, second counter 704 and the first precise regulation circuit 705 cooperatively interact, generation is the cycle with START, pulse width meets the baseband signal that setting requires, and send through the first coaxial fitting 713 after outside first pulse shaping circuit 711, produce the first baseband signal 11; 3rd counter 706, second precise regulation circuit 707, four-counter 709 and the 3rd precise regulation circuit 710 coordinate jointly, wherein the 3rd counter 710 and the second precise regulation circuit 707 are delays time to control part, four-counter 709 and the 3rd precise regulation circuit 710 are pulse width control part, final generation with periodic signal START for the cycle, pulse delay value and pulse width meet the baseband signal that setting requires, send through the second coaxial fitting 714 after outside second pulse shaping circuit 712, produce the second baseband signal 12.
The first baseband signal that multiplex pulse baseband signal generation module produces and the second baseband signal are respectively used to source pulsed modulation and radio frequency door modulation.Between two paths of signals, mutual relationship signal as shown in Figure 5, first baseband signal 11 and the second baseband signal 12 have identical cycle T, t1 is the pulse width of the first baseband signal 11, t2 is the pulse width of the second baseband signal 12, and τ is the time delay of the second baseband signal 12 pulsion phase for the first baseband signal 11.Control to realize receiving gate flexibly, gate delay τ, gate-width degree t2 is adjustable arbitrarily according to the requirement of target echo.Advantage based on the multiplex pulse baseband signal generation module of FPGA comprises: compact, and major function can realize on a slice FPGA, and external circuit is simple; Control accuracy is high, owing to make use of the high precision time delay module of FPGA self, therefore can realize very high control accuracy, and module can realize the periodic regime of 100ns ~ 1ms, minimum 8ns pulse width, pulsewidth and time delay and arrange the indexs such as resolution 0.1ns.
For the first narrow pulse modulator 2 and the second narrow pulse modulator 22 shown in Fig. 3, overall implementation as shown in Figure 6.Narrow pulse modulator comprises microwave portions 201 and driving circuit section 202, is connected between the two by feedthrough capacitor 205.In order to improve burst pulse modulation switch ratio, this invention takes the version of 3 grades of switch series connection.
As shown in Figure 6, narrow pulse modulator comprises radio frequency input (RFIN) port 209, radio frequency exports (RFOUT) port 210 and Puled input (TTL) port 211, microwave signal is inputted by the rf inputs mouth 209 of modulator and exports from radio frequency output port 210, pulsed base band signal is inputted by Puled input port 211, by this module, pulsed base band signal (i.e. the first baseband signal or the second baseband signal) is modulated to microwave signal and gets on.Narrow pulse modulator also comprises the single-pole double-throw switch (SPDT) 203 of microwave FET form, and wherein, 1 pin is radio frequency input pin; 2 pin are output 1, export for radio frequency; 3 pin are output 2, and by 50 ohm of build-out resistor 206 ground connection, object is switched to by signal on 50 ohm of matched loads when switch is in off state, realizes hypersorption, reduce the impact of reflected signal, increase isolation.Positive and negative end shown in Fig. 6 is the control port of switch, and this port is by being connected to the output terminal of high-speed-differential amplifier 207 to ground matching capacitance 204 and feedthrough capacitor 205.In driving circuit section 202, the switch on and off gating pulse of Transistor-Transistor Logic level is sent in high-speed comparator 208, pulse signal is carried out Shape correction and improves driving force, pulse signal after process is divided into 3 tunnels and delivers to three road high-speed-differential amplifiers 207 respectively, and the conversion that high-speed-differential amplifier 207 realizes signal single-ended-to-difference realizes the control to microwave switch afterwards.In figure 6,3 grades of microwave switch circuits and 3 stage drive circuits have employed identical version, by the form of this distributed driving and in conjunction with 3 grades of constructions of switch, narrow pulse modulator can realize the sampling switch ratio of 70dB and the burst pulse modulation capability of 8ns pulsewidth within the scope of 0.8-40GHz.In this module, the advantage of distributed type of drive is: the load capacitance effectively reducing driver, thus improves rising, the negative edge characteristic of modulator, and improves burst pulse ability; Feedthrough capacitor 205 between driving circuit and switch control terminal, matching capacitance 204 are all reflected in the load capacitance of driving circuit, implement in selection course according to the requirement of microwave switch.
Utilize above-mentioned hardware circuit, the present invention is finally effective as shown in Figure 7.By in Fig. 7, transponder pulse modulation signal is a narrow pulse signal; Received signal strength is a series of each undesired signal that can distinguish in time domain and target echo signal, comprising: transmitting-receiving leakage signal 15, reflecting surface echoed signal 16, feed echoed signal 17, target echo signal 18 and rear wall reflected signal 19; Utilize accurate gate delay function, by adding accurate hardware gate signal on received RF path, receiving cable only being opened when target echo arrives, thus reaches the object of hardware filtering clutter interference.Owing to have employed based on narrow pulse modulator, the technology of carrying out the gate control of hardware time domain in microwave signal, that therefore radio frequency gate width can be done is very narrow, thus can realize better echo signal extractability; Owing to have employed the extracting mode of hardware, therefore can not cause software process errors, there is higher precision.
In sum, adopt the RF hardware time domain gate circuit based on narrow pulse modulator of the present invention, by rationally arranging pulse gating parameter, the minimum gate width of 8ns, the gate resolution of 0.1ns can be realized and be better than the gate ability of 70dB in 0.8 ~ 40GHz broadband, can more accurate realize target echoed signal abstraction function.
RF hardware time domain gate circuit based on narrow pulse modulator of the present invention has the following advantages:
(1) gate ability is strong: due to gating circuit is advanced to Microwave Path by intermediate frequency path, avoid the restriction of intermediate-frequency bandwidth to burst pulse ability, burst pulse ability can be risen to 8ns by the 16.7ns of intermediate frequency gating technology, thus realize stronger interference removal ability;
(2) gate resolution is high: have employed the high precision delay technique based on FPGA, gate resolution can be brought up to 0.1ns, radio frequency door position is arranged more accurate;
(3) gate is effective: the radio frequency narrow pulse modulator design proposal based on 3 grades of switch series connection and distributed type of drive ensure that the pulse switch ratio being better than 70dB, can provide outstanding gate effect;
(4) volume structure is small and exquisite, applying flexible: adopt microwave narrow pulse modulator module to coordinate the pulse base band based on FPGA to produce circuit realiration radio frequency time domain gate technique, there is compact, version independently feature, under the prerequisite not changing traditional width phase transceiver version and working method, only need increase the present invention in Microwave Path, the application of radio frequency time domain door can be realized.
The present invention has better burst pulse and time domain resolution character, and provides more excellent time domain hardware filtering effect, and in internal field, outfield etc., RCS field tests has good value for applications.Simultaneously this patent also easily extensible be applied in antenna measurement process, for solving the undesirable problem to antenna measurement Accuracy of test site condition.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1., based on a RF hardware time domain gate circuit for narrow pulse modulator, it is characterized in that, comprising:
Multiplex pulse baseband signal generation module, produces the first baseband signal and the second baseband signal, and the second baseband signal is benchmark with the first baseband signal, generates through time delay; Described multiplex pulse baseband signal generation module comprises FPGA circuit and external circuit, and FPGA circuit completes baseband signal cycle, the counting of pulsewidth and minute adjustment, and produces baseband signal, and external circuit completes the Shape correction of pulse along characteristic; Described FPGA circuit comprises: clock module, for all counters and precise regulation circuit provide public reference clock; First counter, this counter is period counter, and the PRT according to default produces periodic signal, and this periodic signal is as the enabling signal of two-way pulse below; Second counter and the first precise regulation circuit, produce with described periodic signal be the cycle, pulse width meet setting require baseband signal; 3rd counter, the second precise regulation circuit, four-counter and the 3rd precise regulation circuit, wherein the 3rd counter and the second precise regulation circuit are delays time to control part, four-counter and the 3rd precise regulation circuit are pulse width control part, produce with described periodic signal be the cycle, pulse delay value and pulse width meet the baseband signal that setting requires; Described external circuit comprises the first pulse shaping circuit and the second pulse shaping circuit, first pulse shaping circuit receives the baseband signal that described first precise regulation circuit exports, and sends described first baseband signal after paired pulses carries out Shape correction along characteristic by the first coaxial fitting; Second pulse shaping circuit receives the baseband signal that described 3rd precise regulation circuit exports, and sends described second baseband signal after paired pulses carries out Shape correction along characteristic by the second coaxial fitting;
First narrow pulse modulator, the continuous wave signal that received RF signal source produces, is modulated by described first baseband signal, exports pulse-modulated signal, and is sent by complete machine emission port;
Second narrow pulse modulator, receive the echoed signal through amplifying, its break-make moment is controlled by described second baseband signal, exports target area signal.
2. as claimed in claim 1 based on the RF hardware time domain gate circuit of narrow pulse modulator, it is characterized in that, described narrow pulse modulator comprises rf inputs mouth, radio frequency output port and Puled input port, microwave signal is inputted by rf inputs mouth and exports from radio frequency output port, pulsed base band signal is inputted by Puled input port, and pulsed base band signal is modulated to microwave signal.
3., as claimed in claim 2 based on the RF hardware time domain gate circuit of narrow pulse modulator, it is characterized in that, described narrow pulse modulator comprises microwave portions and driving circuit section, is connected between the two by feedthrough capacitor.
4., as claimed in claim 3 based on the RF hardware time domain gate circuit of narrow pulse modulator, it is characterized in that, the microwave portions of described narrow pulse modulator comprises the single-pole double-throw switch (SPDT) of microwave FET form, and wherein, 1 pin is radio frequency input pin; 2 pin are output 1, export for radio frequency; 3 pin are output 2, by build-out resistor ground connection.
5. as claimed in claim 4 based on the RF hardware time domain gate circuit of narrow pulse modulator, it is characterized in that, the driving circuit section of described narrow pulse modulator comprises high-speed comparator and three road high-speed-differential amplifiers, high-speed comparator receives the switch on and off gating pulse of Transistor-Transistor Logic level, pulse signal is carried out Shape correction and improves driving force, pulse signal after process is divided into 3 tunnels and delivers to three road high-speed-differential amplifiers respectively, and the conversion that high-speed-differential amplifier realizes signal single-ended-to-difference realizes the control to microwave switch afterwards.
6. as claimed in claim 5 based on the RF hardware time domain gate circuit of narrow pulse modulator, it is characterized in that, the positive and negative end of described single-pole double-throw switch (SPDT) is the control port of switch, and this port is by being connected to the output terminal of described high-speed-differential amplifier to ground matching capacitance and feedthrough capacitor.
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| CN103308898B (en) * | 2013-05-20 | 2016-07-13 | 中电科仪器仪表有限公司 | A kind of list station pulse RCS based on switch switching tests system |
| CN103248384B (en) * | 2013-05-20 | 2015-06-17 | 中国电子科技集团公司第四十一研究所 | Antenna test method and antenna test system based on wireless pulse technology |
| CN104819685A (en) * | 2015-04-29 | 2015-08-05 | 长安大学 | Landslide monitoring device based on TDR technology and landslide monitoring method thereof |
| CN106027002B (en) * | 2016-05-17 | 2019-06-21 | 电子科技大学 | A kind of nanosecond microwave narrow pulse modulator |
| CN109459733B (en) * | 2018-10-26 | 2021-01-22 | 中电科仪器仪表有限公司 | Anti-collision radar target speed simulation device, system and method based on phase modulation mode |
| CN113824433B (en) * | 2021-08-26 | 2023-08-25 | 电子科技大学 | Pulse modulator based on schottky diode cascade |
| CN113985681B (en) * | 2021-10-28 | 2024-02-27 | 中国科学院声学研究所南海研究站 | Time domain stealth switch and time domain stealth device based on light intensity modulator |
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