CN104199019A - Continuous wave detector testing system - Google Patents
Continuous wave detector testing system Download PDFInfo
- Publication number
- CN104199019A CN104199019A CN201410378111.6A CN201410378111A CN104199019A CN 104199019 A CN104199019 A CN 104199019A CN 201410378111 A CN201410378111 A CN 201410378111A CN 104199019 A CN104199019 A CN 104199019A
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- CN
- China
- Prior art keywords
- signal
- frequency
- continuous wave
- target
- noise amplifier
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
- G01S7/40—Means for monitoring or calibrating
- G01S7/4052—Means for monitoring or calibrating by simulation of echoes
-
- 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
- G01S13/50—Systems of measurement based on relative movement of target
- G01S13/58—Velocity or trajectory determination systems; Sense-of-movement determination systems
- G01S13/583—Velocity or trajectory determination systems; Sense-of-movement determination systems using transmission of continuous unmodulated waves, amplitude-, frequency-, or phase-modulated waves and based upon the Doppler effect resulting from movement of targets
- G01S13/584—Velocity or trajectory determination systems; Sense-of-movement determination systems using transmission of continuous unmodulated waves, amplitude-, frequency-, or phase-modulated waves and based upon the Doppler effect resulting from movement of targets adapted for simultaneous range and velocity measurements
-
- 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
- G01S7/40—Means for monitoring or calibrating
- G01S7/4004—Means for monitoring or calibrating of parts of a radar system
- G01S7/4039—Means for monitoring or calibrating of parts of a radar system of sensor or antenna obstruction, e.g. dirt- or ice-coating
Abstract
The invention relates to a continuous wave detector testing system. A receiving/transmitting antenna is used for receiving and transmitting a signal; the signal received by the receiving/transmitting antenna is transmitted to a low-noise amplifier through a circulator for amplifying, and the amplified signal is applied to local oscillator input of a frequency mixer; a waveform generator is used for setting a waveform signal of a corresponding frequency according to distance information or Doppler frequency in a target detection process; the frequency mixer is used for performing frequency mixing on a local oscillator signal amplified by the low-noise amplifier and the waveform signal generated by the waveform generator to obtain a modulation signal, and the modulation signal is output to an adjustable attenuator; the adjustable attenuator is used for setting an attenuation coefficient according to the distance and size of a simulation target, and simulating to obtain transmission signals under different target conditions; the circulator is used for transmitting simulation transmission signals to the receiving/transmitting antenna for transmitting. Through adoption of the continuous wave detector testing system, frequency modulation continuous wave distance detection and motion target Doppler speed detection can be realized under a ground condition.
Description
Technical field
The present invention relates to high-speed moving object detection technique field, particularly relate to a kind of continuous wave detector test system.
Background technology
Microwave, millimeter wave detection technology have obtained application in a lot of fields, have broad application prospects, for example: the multiple directions such as wireless peripheral warning, velocity radar, automobile collision avoidance radar, fuse, level detection have obtained application.Continuous Wave with frequency modulation by microwave, millimetre-wave radar technology can realize range observation, can survey the speed of moving target by Doppler shift.In actual design process, the detection of the serviceability of detector is generally tested by the target of actual motion on ground, but often more difficult in the situation that of many need to test high-speed moving object, in the time of Distance Test, be subject to the interference of other target of ground.High at millimeter wave frequency band especially, wavelength is short, is difficult to realize homogenous frequency signal by digital simulation method, and cost is also higher simultaneously.Under laboratory condition, short distance target can be set, realize the adjust the distance performance simulation of target of detector; In the time that detection range is far away, place is more limited, is vulnerable to the interference of other target.For the situation of moving target, can be by simulation and the signal scaling of straight line or rotary body realize target; But, in most of the cases, the velocity variations scope of target is larger, such as the top speed of automobile exceedes 120km/h (about 33m/S), more than air speed ranges up to 300m/S, for high speed (>10m/S) target, under surface condition, more difficult simulation realizes.In the research and production process of detector, develop a set of simply, millimeter wave detector test macro has good application demand flexibly.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of continuous wave detector test system, can detect based on realizing Continuous Wave with frequency modulation distance measurement and moving target doppler velocity under surface condition.
The technical solution adopted for the present invention to solve the technical problems is: a kind of continuous wave detector test system is provided, comprise reception/emitting antenna, circulator, adjustable attenuator, low noise amplifier, frequency mixer and waveform generator, described reception/emitting antenna is for receiving and transmitting; The signal that described reception/emitting antenna receives amplifies by described circulator to low noise amplifier, for the local oscillator input of described frequency mixer; Described waveform generator is set the waveform signal of corresponding frequencies according to target detection process middle distance information or Doppler frequency; The waveform signal that local oscillation signal after described frequency mixer amplifies described low noise amplifier and described waveform generator produce carries out mixing, draws modulation signal and exports described adjustable attenuator to; Described adjustable attenuator is set attenuation coefficient according to the distance of simulated target, size, and simulation obtains transmitting under different target condition; Described circulator is sent to reception/emitting antenna by analog transmit signal and launches.
Described low noise amplifier amplifies to the received signal, to reach the local oscillation power level requirement of the minimum work of described frequency mixer.
The frequency of amplifying signal of described low noise amplifier output is identical with the transmission frequency of detector.
Described waveform generator produce also add target detection process when waveform signal in changes in amplitude information.
Between each element, utilize screw carry out fastening or connect by millimeter wave private cable by Waveguide interface.
Beneficial effect
Owing to having adopted above-mentioned technical scheme, the present invention compared with prior art, there is following advantage and good effect: the present invention can realize under surface condition the detector target property simulation under different distance, realize the signal imitation of Ultra-high Speed Moving Target, for the design of detector provides supplemental support.Be conducive to carry out under different target and Different Dynamic characteristic based on the present invention, intermediate-freuqncy signal is carried out follow-up Signal Pretreatment, Digital Signal Analysis is studied carefully.Meanwhile, test macro of the present invention also can be used as detector and produces checkout equipment used.
Brief description of the drawings
Fig. 1 is schematic diagram of the present invention.
Embodiment
Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiment are only not used in and limit the scope of the invention for the present invention is described.In addition should be understood that those skilled in the art can make various changes or modifications the present invention after having read the content of the present invention's instruction, these equivalent form of values fall within the application's appended claims limited range equally.
Embodiments of the present invention relate to a kind of continuous wave detector test system, test macro receives the radiofrequency signal that detector sends, by emitting structural, the signal receiving is carried out to retroeflection, formation transmits with detector radiating circuit difference frequency, enters detector and carries out Frequency mixing processing.In the time that test macro is modulated to the received signal, form transmitting of different amplitudes, different frequency differences; The received power of detector will be controlled by test macro, show as different signal amplitudes from intermediate frequency output; Difference frequency frequency regulates by waveform generator according to the distance of target and velocity information.
As shown in Figure 1, a kind of continuous wave detector test system comprises reception/emitting antenna 1, circulator 2, adjustable attenuator 3, low noise amplifier 4, frequency mixer 5 and waveform generator 6, and described reception/emitting antenna 1 is for reception and the transmitting of millimeter-wave signal that detector is sent; The signal that described reception/emitting antenna 1 receives amplifies by described circulator 2 to low noise amplifier 4, for the local oscillator input of described frequency mixer 5, wherein, low noise amplifier 4 amplifies to the received signal, to reach the local oscillation power level requirement of frequency mixer 5 minimum work; Described waveform generator 6 is set the waveform signal of corresponding frequencies according to target detection process middle distance information or Doppler frequency, also can add changes in amplitude information in target detection process simultaneously; The waveform signal that amplifying signal after described frequency mixer 5 amplifies described low noise amplifier 4 and described waveform generator 6 produce carries out mixing, draw modulation signal and export described adjustable attenuator 3 to, wherein, the local oscillator input end of frequency mixer 5 is low noise amplifier amplifying signal, and its frequency is identical with the transmission frequency of detector; Described adjustable attenuator 3 is set attenuation coefficient according to the distance of simulated target, size, and simulation obtains transmitting under different target condition; Analog transmit signal is sent to reception/emitting antenna by described circulator 2 launches, and has completed thus analog-modulated and forwarding that detector is transmitted.Detector carries out local mixing after receiving the forward signal of target simulation unit, obtains simulating the actual intermediate frequency output signal of detector under physical condition.
In the time that system works frequency range is higher, the decay in signals transmission is more responsive for packaging technology.It is fastening that system element can utilize screw to carry out by Waveguide interface, also can connect by millimeter wave private cable, and the length of cable is as far as possible little, and keeps fixed position.
The present invention is by the outwards a series of CW/FM continuous wave/frequency modulated modulateds of transmitting of antenna, and the reflected signal of receiving target, and the rule that transmitting wave frequency is pressed modulation voltage in time changes.General modulation signal is triangular signal, and the relational expression between target range R and IF is:
wherein, R is target range, and c is the light velocity, T is operating ambient temperature, and Δ F is bandwidth of operation, IF intermediate frequency output signal frequency, as can be seen here, target range is directly proportional to the intermediate-freuqncy signal frequency of radar front end output, therefore can be by the measurement of mixer output signal frequency being realized to the measurement of distance.
In the time that oscillator works in a certain fixing frequency, there is negative Doppler shift time far away apart from change in both, utilizes this Doppler effect can carry out the design of Doppler speed radar.According to Doppler's principle (f
d=2v/ λ), the speed of related movement v of target can be expressed as:
wherein, f
0for transmitted wave centre frequency, λ is transmitted wave wavelength, and c is the light velocity, f
dfor intermediate frequency output signal frequency.
Be not difficult to find, the present invention can realize under surface condition the detector target property under different distance is simulated, and realizes the signal imitation of Ultra-high Speed Moving Target, for the design of detector provides supplemental support.Based on above-mentioned simulation system, be conducive to carry out under different target and Different Dynamic characteristic, intermediate-freuqncy signal is carried out follow-up Signal Pretreatment, Digital Signal Analysis is studied carefully.Meanwhile, the test macro of invention also can be used as detector and produces checkout equipment used.
Claims (5)
1. a continuous wave detector test system, comprise reception/emitting antenna (1), circulator (2), adjustable attenuator (3), low noise amplifier (4), frequency mixer (5) and waveform generator (6), it is characterized in that, described reception/emitting antenna (1) is for receiving and transmitting; The signal that described reception/emitting antenna (1) receives amplifies by described circulator (2) to low noise amplifier (4), for the local oscillator input of described frequency mixer (5); Described waveform generator (6) is set the waveform signal of corresponding frequencies according to target detection process middle distance information or Doppler frequency; The waveform signal that local oscillation signal after described frequency mixer (5) amplifies described low noise amplifier (4) and described waveform generator (6) produce carries out mixing, draws modulation signal and exports described adjustable attenuator (3) to; Described adjustable attenuator (3) is set attenuation coefficient according to the distance of simulated target, size, and simulation obtains transmitting under different target condition; Described circulator (2) is sent to reception/emitting antenna (1) by analog transmit signal and launches.
2. continuous wave detector test system according to claim 1, it is characterized in that, described low noise amplifier (4) amplifies to the received signal, to reach the local oscillation power level requirement of the minimum work of described frequency mixer (5).
3. continuous wave detector test system according to claim 1, is characterized in that, the frequency of amplifying signal of described low noise amplifier (4) output is identical with the transmission frequency of detector.
4. continuous wave detector test system according to claim 1, is characterized in that, described waveform generator produce also add target detection process when waveform signal in changes in amplitude information.
5. continuous wave detector test system according to claim 1, is characterized in that, between each element, utilizes screw carry out fastening or connect by millimeter wave private cable by Waveguide interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410378111.6A CN104199019A (en) | 2014-08-01 | 2014-08-01 | Continuous wave detector testing system |
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| CN201410378111.6A CN104199019A (en) | 2014-08-01 | 2014-08-01 | Continuous wave detector testing system |
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| CN104199019A true CN104199019A (en) | 2014-12-10 |
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| CN201410378111.6A Pending CN104199019A (en) | 2014-08-01 | 2014-08-01 | Continuous wave detector testing system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104863578A (en) * | 2015-05-06 | 2015-08-26 | 电子科技大学 | Electrical conductive rate well measuring method of radar in well |
| CN104866877A (en) * | 2015-04-30 | 2015-08-26 | 苏州科技学院 | RFID range finding structure based on variable power, and method thereof |
| CN105115587A (en) * | 2015-08-19 | 2015-12-02 | 南京理工大学 | Device and method for measuring vibration frequency of tall building structure on the basis of Doppler radar |
| CN109030988A (en) * | 2018-06-20 | 2018-12-18 | 湖北三江航天红林探控有限公司 | A kind of Doppler signal sensitive detection device |
| CN109782237A (en) * | 2017-11-10 | 2019-05-21 | 北京航天万源科技有限公司 | A kind of Radar Analog Echo and interference signal measuring device |
| CN114072697A (en) * | 2019-07-09 | 2022-02-18 | 西门子工业软件荷兰有限公司 | Method for simulating continuous wave lidar sensor |
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| CN202649462U (en) * | 2012-05-03 | 2013-01-02 | 魏忠超 | Radar tachymeter long-distance multifunctional detecting device |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104866877A (en) * | 2015-04-30 | 2015-08-26 | 苏州科技学院 | RFID range finding structure based on variable power, and method thereof |
| CN104866877B (en) * | 2015-04-30 | 2018-09-18 | 苏州科技学院 | A kind of radio frequency ID distance measuring structures and method based on variable power |
| CN104863578A (en) * | 2015-05-06 | 2015-08-26 | 电子科技大学 | Electrical conductive rate well measuring method of radar in well |
| CN105115587A (en) * | 2015-08-19 | 2015-12-02 | 南京理工大学 | Device and method for measuring vibration frequency of tall building structure on the basis of Doppler radar |
| CN109782237A (en) * | 2017-11-10 | 2019-05-21 | 北京航天万源科技有限公司 | A kind of Radar Analog Echo and interference signal measuring device |
| CN109030988A (en) * | 2018-06-20 | 2018-12-18 | 湖北三江航天红林探控有限公司 | A kind of Doppler signal sensitive detection device |
| CN109030988B (en) * | 2018-06-20 | 2020-08-21 | 湖北三江航天红林探控有限公司 | Doppler signal sensitivity detection device |
| CN114072697A (en) * | 2019-07-09 | 2022-02-18 | 西门子工业软件荷兰有限公司 | Method for simulating continuous wave lidar sensor |
| US11460562B2 (en) | 2019-07-09 | 2022-10-04 | Siemens Industry Software Netherlands B.V. | Methods to simulate continuous wave lidar sensors |
| CN114072697B (en) * | 2019-07-09 | 2023-03-24 | 西门子工业软件公司 | Method for simulating continuous wave lidar sensor |
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Application publication date: 20141210 |