CN103513237A - Broadband coherent polar region deep-layer ice penetrating radar system - Google Patents
Broadband coherent polar region deep-layer ice penetrating radar system Download PDFInfo
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- CN103513237A CN103513237A CN201210225049.8A CN201210225049A CN103513237A CN 103513237 A CN103513237 A CN 103513237A CN 201210225049 A CN201210225049 A CN 201210225049A CN 103513237 A CN103513237 A CN 103513237A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/06—Systems determining position data of a target
- G01S13/08—Systems for measuring distance only
- G01S13/10—Systems for measuring distance only using transmission of interrupted, pulse modulated waves
- G01S13/26—Systems for measuring distance only using transmission of interrupted, pulse modulated waves wherein the transmitted pulses use a frequency- or phase-modulated carrier wave
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/885—Radar or analogous systems specially adapted for specific applications for ground probing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/28—Details of pulse systems
- G01S7/282—Transmitters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/28—Details of pulse systems
- G01S7/285—Receivers
- G01S7/288—Coherent receivers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/28—Details of pulse systems
- G01S7/285—Receivers
- G01S7/34—Gain of receiver varied automatically during pulse-recurrence period, e.g. anti-clutter gain control
Abstract
The invention discloses a broadband coherent polar region deep-layer ice penetrating radar system which comprises a digital system, a receiving system and a transmitting system. The digital system comprises a control unit, a frequency synthesis unit, a data collecting unit and a DDS, wherein the control unit is used for controlling al the units of the radar system, the frequency synthesis unit is used for generating clock signals needed by the operation of the control unit and the data collecting unit, the data collecting unit is used for collecting analog signals and storing and transmitting GPS signals, and the DDS is used for generating linear frequency modulation signals sources. The transmitting system comprises a power amplifier and a transmitting antenna, wherein the power amplifier is used for carrying out power amplification on the linear frequency modulation signal sources generated by the DDS, and the transmitting antenna is used for radiating electromagnetic wave signals output by the power amplifier out. The receiving system comprises a double-channel receiving unit used for carrying out high-gain channel and low-grain channel amplification on the received signals output by the front end units. A wave band between VHF and UHF is selected as system working frequency, a frequency modulation pulse compression system is adopted, and the requirements for penetrability and the resolution ratio can be met.
Description
Technical field
The invention belongs to Radar Technology field, be particularly related to relevant polar region, a kind of broadband deep layer and visit ice radar system, the principle little to electromagnetic wave attenuation according to ice wherein, utilize electromagnetic wave to subglacial layering survey, for surveying the structures such as polar ice sheet thickness and subglacial layering.
Background technology
It is Englishman Waite the 1950's that the method that adopts the earliest radar is surveyed polar glacier, after this for this purpose radar system, develops rapidly.Traditional radar system has all adopted short pulse system.
China sent team to carry out scientific investigation in the Antarctic from 1984 first.Twentieth century beginning of the eighties, Chinese Academy of Sciences's Cold and drought Region environment and Graduate School of Engineering have developed B-1 type thickness measuring radar ，Bing glacier, No. one, Tianshan Mountains and successfully test was carried out in Antarctic region.
Above-mentioned spy ice radar is all traditional ground penetrating radar (Ground Penetrating Radar, GPR) in essence.Principle is transmitting ultrahigh frequency short pulse (Impulse) electromagnetic wave, and underground dielectric distribution is carried out to high-precision physical detecting.
The technical disadvantages that tradition is visited ice radar comprises: (1) transponder pulse is Impulse system, and average energy is little; (2) fine coupling is wanted on antenna and ground, is transmitted into underground guarantee energy maximization; (3) Impulse radar system generally adopts Equivalent Sampling Technology, requires the motion platform speed can not be too high, and this has also limited radar and has been equipped on the application on rapid movement platform.
Tradition is visited the These characteristics of ice radar, and the application that restriction Liao Ta polar region deep layer subglacial is surveyed, has also limited it in vehicle-mounted and application airborne platform.
Summary of the invention
In order to overcome the above-mentioned defect of prior art, the present invention proposes relevant polar region, a kind of broadband deep layer and visit ice radar system.
Relevant polar region, the broadband deep layer that the present invention proposes is visited ice radar system and is comprised digital display circuit, receiving system, emission coefficient, USB interface and host computer,
Wherein digital display circuit further comprises: control module, for each unit of radar system is controlled; Frequency synthesis unit, carries out for generating control module and data acquisition unit the clock signal needing; Data acquisition unit, for gathering simulating signal storage and transmit GPS signal; DDS, for generating linear frequency modulation signal source;
Emission coefficient further comprises: power amplifier, carries out power amplification for the linear frequency modulation signal source that DDS is generated; Emitting antenna, for radiateing the electromagnetic wave signal of power amplifier output;
Receiving system further comprises: dual channel receiver unit, for to receiving, the signal of front end unit output carries out high-gain and two passages of low gain amplify; Receiving front-end unit, for tentatively amplifying receiving antenna output signal; Receiving antenna, for receiving underground echoed signal and exporting to receiving front-end, GPS module, the global position system GPS information receiving for gathering gps antenna; Gps antenna, for exporting to GPS module by the global position system GPS information receiving.
Relevant polar region, broadband of the present invention deep layer is visited ice radar system and is operated in VHF-UHF (VHF～UHF), has taken into account the requirement of radar penetrability and resolution.Receiver adopts single front end dual channel receiver machine technology, and the echoed signal that has guaranteed glacier shallow-layer and deep layer can both obtain enough amplifications and be undistorted.
The present invention has adopted receiver front end switch and receiver high-gain switch designs, has guaranteed that the strong echoed signal in ice sheet surface can not make receiver front end and data acquisition unit saturated.System is controlled and is adopted FPGA to realize, switch control logic is carried out to sequential setting, make the rising edge of receiver front end switch controlling signal early than receiver high-gain switch, negative edge is later than receiver high-gain switch controlling signal, has guaranteed that the impact of video leakage signal is minimum.
Signal source of the present invention is wideband frequency modulation signal source, adopts Direct Digital signal generator (DDS) technology to generate.Radar system has adopted pulse compression technique, and adopts coherent integration to improve signal quality, improves the dynamic range of system.Transmitter adopts solid state transmitter technology, and power amplifier adopts power supply modulation technique, has reduced the average power consumption of radar transmitter.Radar system adopts the working method of looking just down, and antenna direction is perpendicular to ground.Radar system can work in vehicle-mounted or airborne platform.
Radar system of the present invention adopts the relevant frequency modulation on pulse compression in broadband system, and different from the radar of prior art, frequency modulation on pulse compression system has increased exomonental average power with respect to Impulse system; Coherent integration technology has increased the processing income of system; Dual channel receiver technology has increased the dynamic range of receiver, and These characteristics has guaranteed that relevant polar region, broadband deep layer visits ice radar system and can carry out the detection of deep layer subglacial, and subglacial investigation depth can be greater than 2000 meters.
Accompanying drawing explanation
Fig. 1 is that relevant polar region, broadband of the present invention deep layer is visited ice radar system composition frame chart;
Fig. 2 is that relevant polar region, broadband of the present invention deep layer is visited ice radar system receiver structure figure;
Fig. 3 is that relevant polar region, broadband of the present invention deep layer is visited ice radar system power amplifier structure figure;
Fig. 4 is the basic flow sheet that relevant polar region, broadband of the present invention deep layer is visited ice radar system digital display circuit coherent integration program;
Fig. 5 is that relevant polar region, broadband of the present invention deep layer is visited ice radar system receiver switch steering logic sequential chart;
Fig. 6 is that relevant polar region, broadband of the present invention deep layer is visited ice radar system engineering prototype main frame exemplary plot;
Fig. 7 is that relevant polar region, broadband of the present invention deep layer is visited ice radar system engineering prototype power amplifier exemplary plot;
Fig. 8 is that relevant polar region, broadband of the present invention deep layer spy ice radar system is installed on snowmobile South Pole actual measurement scene graph;
Fig. 9 is for utilizing relevant polar region, broadband of the present invention deep layer to visit ice radar system in the 28th scientific investigation in the Antarctic measured data example 1 of China;
Figure 10 is for utilizing relevant polar region, broadband of the present invention deep layer to visit ice radar system in the 28th scientific investigation in the Antarctic measured data example 2 of China.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.
Relevant polar region, broadband of the present invention deep layer is visited ice radar system, can survey for polar ice sheet film thickness.
Fig. 1 is that relevant polar region, broadband of the present invention deep layer is visited ice radar system composition frame chart.With reference to Fig. 1, this radar system comprises digital display circuit, receiving system and emission coefficient and USB interface and host computer etc.
Digital display circuit further comprises: control module, frequency synthesis unit, data acquisition unit and Direct Digital signal generator (DDS).Control module is connected with frequency synthesis unit, data acquisition unit, DDS, and is connected with host computer by USB interface, for each unit of radar system is controlled; Frequency synthesis unit is connected with data acquisition unit with control module, the clock signal needing for generating this two parts unit; Data acquisition unit is connected with control module, frequency synthesis unit, receiving system, and be connected with host computer by USB interface, for gathering simulating signal and the gps signal of the output of dual channel receiver unit, and be transferred to host computer, data acquisition unit is the signal that demodulation is not passed through in direct collection, and demodulation completes by Digital Down Convert at host computer; DDS is connected with emission coefficient with control module, for generating linear frequency modulation signal source, exports power amplifier to.
Emission coefficient further comprises: power amplifier and emitting antenna.Power amplifier is connected with emitting antenna with DDS, for the linear frequency modulation signal source that DDS is generated, carries out power amplification; Emitting antenna is connected with power amplifier, for the electromagnetic wave signal of power amplifier output is radiate.
Receiving system further comprises: dual channel receiver unit, receiving front-end unit, receiving antenna, GPS module and gps antenna.Dual channel receiver unit is connected with receiving front-end unit with data acquisition unit, for the signal of receiving front-end output being carried out to two passages amplifications of high-gain and low gain; Receiving front-end unit is connected with receiving antenna with dual channel receiver unit, for tentatively amplifying receiving antenna output signal; Receiving antenna is connected with receiving front-end, for receiving underground echoed signal and exporting to receiving front-end.GPS module is connected with gps antenna with data acquisition unit, GPS (GPS) information receiving for gathering gps antenna; Gps antenna is connected with GPS module, for the GPS receiving (GPS) information is exported to GPS module.
USB interface is connected with control module, data acquisition unit and host computer, for transmitting data and control signal; Host computer is connected with USB interface, for control module and data acquisition unit are sent to instruction, and the data that storage data acquisition unit collects.
Fig. 2 is that relevant polar region, broadband of the present invention deep layer is visited ice radar system receiver structure figure.With reference to Fig. 2, receiver is comprised of receiving front-end unit and dual channel receiver unit two parts.Receiving front-end unit further comprises: limiter 2, wave filter 3, switch 4 and LNA 5.Dual channel receiver unit further comprises: low-gain channel and high-gain passage two parts; Low-gain channel further comprises: digital pad 7 and amplifier 9; High-gain passage further comprises: single-pole double-throw switch (SPDT) 6, digital pad 8 and amplifier 10.
Signal stream description in receiver is as follows: the echoed signal being received by antenna 1 is first through limiter 2, and limiter 2 is for preventing stronger direct wave damage receiver front end.The signal of exporting from limiter 2 is through wave filter 3 and the switch 4 of receiver front end, the LNA 5 that enters afterwards receiving front-end unit.The signal of receiving front-end unit output is divided into low-gain channel and high-gain passage two-way.The signal of receiving front-end unit output enters behind low-gain channel, through attenuator 7 and amplifier 9, enters data acquisition unit; The signal of receiving front-end unit output enters after high-gain passage, is introduced into single-pole double-throw switch (SPDT) 6, uses single-pole double-throw switch (SPDT) can control high-gain passage and low-gain channel and opens or closes according to sequential separately; Then pass through digital pad 8 and amplifier 10, enter data acquisition unit.The control signal that the control module of digital display circuit sends comprises: receiving front-end unit switch control signal 11, control the opening and closing of receiving front-end unit switch; High-gain passage digital pad and switch controlling signal 12, control the work of high-gain passage digital pad and close and the opening and closing of switch; Low-gain channel digital pad control signal 13, controls the work of low-gain channel digital pad and closes.
Fig. 3 is that relevant polar region, broadband of the present invention deep layer is visited ice radar system power amplifier structure figure.With reference to Fig. 3, power amplifier adopts three grades of solid-state amplifier design proposals, require lightweight, be with wide, gain high and reliability is high.Power amplifier is comprised of match circuit 301, first order amplifier 302, match circuit 303, second level amplifier 304, match circuit 305, third level amplifier 306, match circuit 307, coupling geophone 308, switch 309.
Signal stream description in power amplifier is as follows: the DDS of radar system digital display circuit produces linear FM signal, through match circuit 301, enters first order amplifier 302, tentatively amplifies; Then through match circuit 303He second level amplifier 304, carry out middle power amplification; Finally by overmatching circuit 305 and third level amplifier 306, carry out high-power amplification; Match circuit 307 mates for the output impedance to power amplifier; Coupling geophone 308 is for detection of the power level of power amplifier; Switch 309 is for controlling the opening and closing of power amplifier.
Detection and control signal are produced by digital display circuit control module, comprising: gauge tap pulse signal 313, for the opening and closing of gauge tap 309; Detect voltage 311, for exporting the power level of the power amplifier of being determined by coupling geophone 308; Input voltage has two kinds, is respectively+12V voltage 312 and third level amplifier+28V voltage 310, and+12V voltage is respectively to switch 309, amplifier 302 and amplifier 304 power supplies; + 28V voltage is to amplifier 306 power supplies.
Amplifier power supply adopts cover Pulse Design, by digital display circuit control module, produces pulse signal, when pulse arrives, and power supply opening; After end-of-pulsing, power-off.Power pulse need to be longer than the signal pulse of transmitter transmitting (conventionally rising edge and negative edge each more than long 5 μ S), than signal pulse, opens early, closes late.This design has reduced the power consumption of transmitter.
Fig. 4 is the basic flow sheet that relevant polar region, broadband of the present invention deep layer is visited the coherent integration program of ice radar system digital display circuit.Coherent integration program has completed coherent integration function in radar data acquisition process, has improved the signal to noise ratio (S/N ratio) of image data, has reduced the memory space of raw data.Coherent integration program, is divided into adc data collection 401, integration coherent accumulation 402 and 403 3 processing procedures of data framing.Use a RAM as integration coherent accumulation buffer unit, a FIFO is as data framing buffer unit, and ADC starts the length Yi Zhengwei unit of image data, and frame length is set by upper application software.
With reference to Fig. 4, in original state, whether the sampling gate signal Trig that first digital display circuit control module detects control timing sequence generating arrives, if, read the original frame data after ADC sampling, and it is cumulative that the data of buffer memory in original frame data and RAM (original state value is entirely zero) are made to coherent integration, completes frame data cumulative (accumulative frequency is inputted by application layer software), if accumulative frequency does not finish, cumulative data result is sent into RAM and make buffer memory; If cumulative, finish, export sign Flag, data cached in removing RAM, and cumulative data is sent into Back end data become frame module.Frame frame head data comprises flag, frame counter, parameter information and reserve bytes, and after framing, data write FIFO buffer memory again, and informs that rear end USB module reads data in FIFO.Usb interface module need to complete the function of data transmission, receive and control parameter and linear FM signal Wave data, and the data that coherent integration is processed is passed to host computer from host computer.
Fig. 5 is that relevant polar region, broadband of the present invention deep layer is visited ice radar system receiver switch steering logic sequential chart.With reference to Fig. 5, whether the setting of receiver control logic sequential is correctly the precondition that can receiver normally receive echoed signal.
Operation of receiver principle and the setting of receiver switch steering logic sequential are expressed as follows: when carrying out ice sheet measurement, receiver receives shallow-layer echoed signal and ice sheet deep layer echoed signal under ice sheet surface echo signal (and emitting antenna is directly coupled to the direct wave of receiving antenna), ice sheet successively according to time sequencing.If the intensity of echoed signal is not distinguished, adopt same amplification channel, stronger ice sheet surface echo (and direct wave) can make the saturation of receiver, even damages receiver.Receiver adopts a receiving front-end, high low gain double reception channels designs, according to this principle, completes.The echo signal amplitude arriving is at first also the strongest, and signal weakens gradually subsequently.Thereby, need to calculate t2 time of arrival that surface echo reaches time t1 and direct wave according to the aerial velocity of propagation of electromagnetic wave, getting tA is the greater in t1 and t2.As shown in Figure 5, after emission coefficient has transmitted, receiver front end switch opens 501, at this time, receiver high-gain switch cuts out.Elapsed time tA, after surface echo signal (and direct wave) finishes receiving, receiver high-gain switch opens 502, so just can avoid receiver high-gain passage to be damaged by surface echo (and direct wave).In real work, the receiver high-gain switch opens time can also according to circumstances be slightly larger than tA.
It is the video leakage signal of switch that receiver switch steering logic sequential arranges the another one factor that need to consider.Switch video leakage signal refers to, when switch is not in the situation that there is no radio-frequency input signals during switching state, and the spur signal producing in its radio-frequency (RF) output end.It is the inherent characteristic of switch that switch video leaks, and cannot root, thoroughly eliminate.The setting of receiver switch steering logic sequential will reduce the amplification of receiver to switch video leakage signal as far as possible, reduces its impact.As shown in Figure 5, after signal finishes receiving, receiver high-gain switch cuts out 503, and after a time delay tB (conventionally getting several microseconds), receiver front end switch cuts out 504.Otherwise if receiver front end switch first cuts out, the switch video leakage signal of generation will be amplified through receiver front end, receiver high-gain passage amplifies, the amplitude that switch video leakage signal is exaggerated is like this maximum, also maximum on the impact of receiver.
Fig. 6 is that relevant polar region, broadband of the present invention deep layer is visited ice radar system engineering prototype main frame example, Fig. 7 engineering prototype power amplifier example.According to reality test, this project model machine subglacial investigation depth is greater than 2000 meters.
Fig. 8 is that relevant polar region, broadband of the present invention deep layer spy ice radar system is installed on snowmobile South Pole actual measurement scene graph; Fig. 9 is for utilizing relevant polar region, broadband of the present invention deep layer to visit ice radar system in the 28th scientific investigation in the Antarctic measured data example 1 of China; Figure 10 is for utilizing relevant polar region, broadband of the present invention deep layer to visit ice radar system in the 28th scientific investigation in the Antarctic measured data example 2 of China.
As seen from Figure 9, aqualite interface 1 is greatly between 1600-1800 rice, and middle layer 2 and shallow-layer layering 3 are high-visible.As seen from Figure 10, aqualite interface 1 is greatly between 2200-2300 rice, and middle layer 2 and shallow-layer layering 3 are high-visible.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
- Relevant polar region, 1.Yi Zhong broadband deep layer is visited ice radar system, and this system comprises digital display circuit, receiving system, emission coefficient,Wherein digital display circuit further comprises: control module, for each unit of radar system is controlled; Frequency synthesis unit, the clock signal needing for generating control module and data acquisition unit; Data acquisition unit, for gathering dual channel receiver element output signal and gps signal, and transfers to host computer and stores; Direct Digital signal generator DDS, for generating linear frequency modulation signal source;Emission coefficient further comprises: power amplifier, carries out power amplification for the linear frequency modulation signal source that DDS is generated; Emitting antenna, for radiateing the electromagnetic wave signal of power amplifier output;Receiving system further comprises: dual channel receiver unit, for to receiving, the signal of front end unit output carries out high-gain and two passages of low gain amplify; Receiving front-end unit, for tentatively amplifying receiving antenna output signal; Receiving antenna, for receiving underground echoed signal and exporting to receiving front-end unit; GPS module, the global position system GPS information receiving for gathering gps antenna; Gps antenna, for exporting to GPS module by the global position system GPS information receiving.
- 2. system according to claim 1, is characterized in that, described radar system further comprises:USB interface, is connected with control module, data acquisition unit and host computer, for transmitting data and control signal;Host computer, is connected with USB interface, for control module and data acquisition unit are sent to instruction, and the data that storage data acquisition unit collects.
- 3. system according to claim 1, is characterized in that, described receiving front-end unit further comprises: limiter, wave filter, switch and LNA.
- 4. system according to claim 3, is characterized in that, described dual channel receiver unit further comprises: low-gain channel and high-gain passage two parts, and low-gain channel further comprises digital pad and amplifier; High-gain passage further comprises single-pole double-throw switch (SPDT), digital pad and amplifier.
- 5. system according to claim 4, it is characterized in that, in receiving system, by the echoed signal of antenna reception first through limiter, limiter is for preventing stronger direct wave damage receiving front-end unit, the signal of exporting from limiter is through wave filter and the switch of receiving front-end unit, enter afterwards the LNA of receiver front end unit, the signal of receiver front end unit output is divided into low-gain channel and high-gain passage two-way, the signal of receiver front end unit output enters behind low-gain channel, through digital pad and amplifier, enter data acquisition unit, the signal of receiver front end unit output enters after high-gain passage, is introduced into single-pole double-throw switch (SPDT), uses single-pole double-throw switch (SPDT) can control high-gain passage and low-gain channel and opens or closes according to sequential separately, then pass through digital pad and amplifier, enter data acquisition unit.
- 6. according to the system described in claim 1-5 any one, it is characterized in that, described power amplifier comprises the first match circuit, first order amplifier, the second match circuit, second level amplifier, the 3rd match circuit, third level amplifier, the 4th match circuit, coupling geophone, switch.
- 7. system according to claim 6, is characterized in that, the signal flow in described power amplifier is: described DDS produces linear FM signal, through the first match circuit, enters first order amplifier, tentatively amplifies; Then through the second match circuit and second level amplifier, carry out middle power amplification; Finally by crossing the 3rd match circuit and third level amplifier, carry out high-power amplification; The 4th match circuit is for mating the output impedance of power amplifier; Coupling geophone is for detection of the power level of power amplifier; Switch is for controlling the opening and closing of power amplifier.
- 8. system according to claim 7, is characterized in that, amplifier power supply adopts cover Pulse Design, by radar system control module, produces pulse signal, when pulse arrives, and power supply opening; After end-of-pulsing, power-off, power pulse is longer than the signal pulse of emission coefficient transmitting, than signal pulse, opens early, closes late.
- 9. system according to claim 8, it is characterized in that, the coherent integration program of described digital display circuit is completed by control module and data acquisition unit, comprise adc data collection, integration coherent accumulation and three processing procedures of data framing, coherent integration program has completed coherent integration function in radar data acquisition process, improve the signal to noise ratio (S/N ratio) of image data, reduce the memory space of raw data.
- 10. system according to claim 9, it is characterized in that, when carrying out ice sheet measurement, receiver receives according to time sequencing the direct wave that ice sheet surface echo signal and emitting antenna are directly coupled to receiving antenna successively, shallow-layer echoed signal and ice sheet deep layer echoed signal under ice sheet, according to the aerial velocity of propagation of electromagnetic wave, calculate t2 time of arrival of surface echo t1 time of arrival and direct wave, getting tA is the greater in t1 and t2, after emission coefficient has transmitted, receiver front end switch opens, receiver high-gain switch cuts out, elapsed time tA, after surface echo signal and direct wave finish receiving, receiver high-gain switch opens.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104463325A (en) * | 2014-12-04 | 2015-03-25 | 中国科学院电子学研究所 | Noise suppression method for polar ice-penetrating radar original data |
| CN105093227A (en) * | 2015-08-27 | 2015-11-25 | 电子科技大学 | Traffic flow measuring apparatus and vehicle operation information obtaining method |
| CN106353754A (en) * | 2016-08-30 | 2017-01-25 | 中国水利水电科学研究院 | Integrated detection radar system for ice and water conditions |
| CN110207720A (en) * | 2019-05-27 | 2019-09-06 | 哈尔滨工程大学 | A kind of adaptive binary channels bearing calibration of polar region integrated navigation |
| CN110361699A (en) * | 2019-07-23 | 2019-10-22 | 北京工业大学 | A method of the ice radar data suitable for South Pole aviation measurement scene is handled |
| CN111175700A (en) * | 2020-01-19 | 2020-05-19 | 中国科学院电子学研究所 | 77GHz millimeter wave MIMO radar front-end system |
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| CN104463325A (en) * | 2014-12-04 | 2015-03-25 | 中国科学院电子学研究所 | Noise suppression method for polar ice-penetrating radar original data |
| CN105093227A (en) * | 2015-08-27 | 2015-11-25 | 电子科技大学 | Traffic flow measuring apparatus and vehicle operation information obtaining method |
| CN106353754A (en) * | 2016-08-30 | 2017-01-25 | 中国水利水电科学研究院 | Integrated detection radar system for ice and water conditions |
| CN110207720A (en) * | 2019-05-27 | 2019-09-06 | 哈尔滨工程大学 | A kind of adaptive binary channels bearing calibration of polar region integrated navigation |
| CN110361699A (en) * | 2019-07-23 | 2019-10-22 | 北京工业大学 | A method of the ice radar data suitable for South Pole aviation measurement scene is handled |
| CN111175700A (en) * | 2020-01-19 | 2020-05-19 | 中国科学院电子学研究所 | 77GHz millimeter wave MIMO radar front-end system |
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