CN105547174A - Distributed high-precision laser online measurement system - Google Patents
Distributed high-precision laser online measurement system Download PDFInfo
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- CN105547174A CN105547174A CN201510846985.4A CN201510846985A CN105547174A CN 105547174 A CN105547174 A CN 105547174A CN 201510846985 A CN201510846985 A CN 201510846985A CN 105547174 A CN105547174 A CN 105547174A
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- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
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Abstract
The invention provides a distributed high-precision laser online measurement system. A main/backup laser device acts as an emitting light source. Emitting laser is divided into multipath emitting light beams through an optical beam combiner, an optical circulator and an optical beam splitter. The number of split light paths of the emitting light beams is further increased by an optical switch array, and the optical switches can perform time sequence switching on emergent light paths through the control of the system. Each path of emergent laser is corresponding to one optical transmit-receive antenna so as to be corresponding to one cooperative target body. Laser returned by the cooperative target returns to the optical circulator through the light paths and enters a photoelectric detector. Echo phase calculation is performed by a signal processing system after photoelectric conversion of the photoelectric detector so that accurate distance information of a target dot matrix can be obtained. In-orbit real-time deformation measurement is performed on satellite antennas and other large deployable mechanisms, and imaging resolution of the large antennas and the calculated image quality can be enhanced by measurement of the antenna surface.
Description
Technical field
The present invention relates to spationautics field, particularly relate to a kind of distributed high-accuracy laser on-line measurement device for large corporation's distortion measurements such as satellite SAR antennas.
Background technology
In the various development mechanism of satellite, various on-line measurement is needed to obtain its positional precision, vibration performance.The profile measurement of antenna has significant impact to imaging resolution, the picture quality that calculates.
The large-scale antenna mechanisms such as satellite-borne SAR, the effect of the various load in space can be subject in orbit in process, these load mainly comprise thermal force, the Gradient of Gravitation square, atmospherical drag and satellite motion interference etc., thus cause aerial panel to vibrate, reduce attitude stability and the pointing accuracy of satellite, and have a strong impact on the performance of antenna, cause image blur, resolution to reduce; More seriously vibration may cause antenna structure to destroy.Therefore, very necessary with control to the vibration survey of spaceborne large-scale antenna mechanism for implementing.
When the front of spaceborne large-scale antenna mechanism produces distortion in the effect of external disturbance, also corresponding change can be there is in the radiating element position of front, error produces important impact by system electrical property, and by causing that the directional diagram of antenna distorts, main lobe gain declines, minor level raises and beam position is inaccurate etc.
Laser phase formula ranging technology is comparatively ripe, the commercial hand-hold ranger of part also uses this detection mode, but when large-scale development mechanism face, the space type measurement that SAR antenna is such, conventional hand stadimeter all cannot satisfy the demands from the aspect such as measuring accuracy or data updating rate, especially antenna surface type needs a large amount of target detection, push away by the position of space lattice is counter, single-point hand-hold ranger more cannot satisfy the demands.Although image camera can carry out high definition imaging to sky line target, even binocular distance measurement, its precision also cannot satisfy the demands.Scanning imagery laser radar is limited to the multiple impact of sweep time, distance accuracy and angle measurement accuracy, and the integrity problem of work time long especially in-orbit, makes it cannot meet similar tasks demand.
For laser phase formula range finding aspect, in patent " a kind of phase-shift laser rangefinder device ", propose a kind of laser distance measuring system for range observation, the light that laser instrument directly sends by this device enters integrated electro-optic modulator through fiber optic conduction, emergent light still through fiber optic conduction to stadimeter transmitting objective lens focus place, simplify light channel structure.In patent " laser distance measuring system ", discuss the composition of laser distance measuring system more in detail, include emission coefficient, receiving system, control and measuring system etc.In patent " Full-phase FFT spectrum analyzing device ", indicate that it has the performance of good suppression spectral leakage, and due to its " phase invariance ", do not need to take Spectrum Correction measure accurately can extract the phase information of signal.But above-mentioned all patents, all cannot solve distortion measurement institute of large-scale antenna mechanism problems faced.
Article " distortion measurement in DistortionMeasurementandCompensationinaSyntheticAperture RadarPhased-ArrayAntenna synthetic-aperture radar phased array antenna and compensation " is pointed out, in wireless synthetic aperture satellite (WiSAR), have employed phase type array ranging technology carry out monitoring aerial distortion and compensate, its carrier wave is the microwave carrier of 3.74GHz, and its measuring accuracy only can reach about 1mm.Article " correlative study of portable laser stadimeter " and article " laser range finder based on FPGA and DDS technology " all describe the relevant Development Techniques of phase laser distance measurement instrument, but as discussing above, they all cannot solve that this patent proposes for the measurement needed for large-scale antenna deformation and evaluation work, and the creative part of this also this patent just.
Summary of the invention
The problem that the present invention solves is that the large-scale deployable antenna of satellite (as SAR) mechanism easily occurs to be out of shape in-orbit, and distortion will affect the position phase precision of antenna array radiating element, thus cause the directional diagram of antenna and imaging to distort, affect antenna imaging precision.For this reason, the invention provides a kind of distributed high-accuracy laser on-line measurement device for large corporation's distortion measurements such as satellite SAR antennas, effectively to improve the deformation measurement precision of antenna.
In order to achieve the above object, technical scheme of the present invention is to provide a kind of distributed high-accuracy laser on-line measurement system for large-scale development mechanism distortion measurements such as satellite antennas, comprising:
Active/standby Emission Lasers source and modulation drive system, described modulation drive system adopts just/cosine signal to modulate to the light intensity of described active/standby Emission Lasers source Output of laser;
Optics bundling device, is combined into light beam by the emergent light in described active/standby Emission Lasers source;
Optical circulators is as optical transmitting and receiving switch, and the Emission Lasers after involutory bundle carries out transceiver insulation;
Optical beam-splitter, is divided into multichannel utilizing emitted light by Emission Lasers;
Array of photoswitch, controls the Laser emission of different emitting light path;
Dual-mode antenna array, is respectively equipped with a corresponding dual-mode antenna to each road Emission Lasers;
Cooperative target array, itself and dual-mode antenna array are according to the corresponding layout in the geometric position preset, and described cooperative target array is small corner cube reflector array, and described corner cube reflector is reflected back original place by irradiating the light entered by parallel light path direction;
Photodetector, the reflected light being transferred to this photodetector via described optical circulators is converted to electric signal by it;
Signal transacting and control system resolve process to electric signal, obtain the accurate distance information of Target Aerial Array.
Preferably, described signal transacting and control system comprise:
DDS hardware module, for generating various signal source, wherein comprises further:
Main signal generation module, for generation of emitted luminescence intensity modulation signal;
First reference signal generation module, for generation of the reference signal of launching modulation signal;
Second reference signal generation module, for generation of reference phase signal, to assess the phase shift of echoed signal;
Launch modulation module, it connects main signal generation module, for realizing the pre-service of launching modulation signal, to drive active/standby Emission Lasers source;
Signal reception pretreatment module, for the signal of described photoelectric detector is comprised filtering, amplification pre-service and realize AGC automatic gain;
Frequency mixing module, carries out analog frequency mixing process for the signal that obtains Signal reception pretreatment module and the first reference signal generation module, realizes the down coversion of heliogram;
One AD sampling module, carries out sampling processing, to realize analog/digital conversion for the low frequency signal produced frequency mixing module;
2nd AD sampling module, for sampling to the second reference signal generation module, to realize analog/digital conversion;
FPGA hardware module, for signal transacting and solving target distance, comprises further:
Correlator phase discriminator module, for realizing the digital phase detection function of an AD sampling module and the 2nd AD sampling module;
Distance resolves module, resolves for carrying out distance according to phase place identified result;
Host computer communication module, is used for communicating with master system;
Time-sequence control module, is used for carrying out switch control rule to array of photoswitch, realizes measuring to control different light paths.
Preferably, described active/standby Emission Lasers source adopts active/standby part semiconductor laser as transmitting illuminant, and closes light by the optics bundling device of 50:50.
Preferably, described array of photoswitch adopts MEMS optical switch, and control signal rising time is less than 0.5ms, and passage is more than 1 × 32.
Preferably, described dual-mode antenna array number is consistent with cooperative target array number, and both direct one_to_one corresponding after mechanism deploying, transmitting-receiving optical antenna beam divergence angle size can be out of shape the target azimuth skew caused by covered structure, makes cooperative target can not offset out system visual field.
Preferably, the modulating frequency of described modulation drive system is 100MHz.
Preferably, system adopts dual wavelength dual-support structure staggered irradiation Target Aerial Array.
The invention provides a kind of distributed high-accuracy laser on-line measurement device for satellite large-scale antenna (as SAR) mechanism distortion measurement, adopt active/standby part laser instrument as the transmitting illuminant of elevator system reliability and mission life; Emission Lasers is divided into multichannel transmitted beam via after optics bundling device, optical circulators and optical beam-splitter; Transmitted beam increases a point beam optical path number by array of photoswitch further, and meanwhile, photoswitch can carry out sequential switching by the control of system to bright dipping light path; The corresponding optical transmitting and receiving antenna of each road shoot laser, and then a corresponding cooperative target standard type; The laser returned through cooperative target gets back to optical circulators by above-mentioned light path equally, and enters photodetector; After the opto-electronic conversion of photodetector, carry out phase of echo by signal processing system and resolve, thus obtain the accurate distance information of target dot matrix, the deflection of antenna surface type can be evaluated after algorithm process.The invention provides a kind of means of the large-scale development mechanisms such as satellite antenna being carried out to distortion measurement in real time in-orbit, by the measurement to antenna surface type, the imaging resolution that can promote large-scale antenna and the picture quality calculated.
Compared with prior art, the present invention has the following advantages:
The present invention efficiently solves the mechanisms such as the large-scale deployable antenna of satellite (as SAR) and is out of shape the problem measured in real time in-orbit.Measuring system does not adopt any movable part, and reliability is high, and have employed Double redundancy backup in key component-laser instrument, possesses the power degeneration ability compensating long-term work, is adapted to the strict demand of long-life satellite; System adopts dual wavelength dual-support structure staggered irradiation layout, effectively avoids the staggered interference problem that far field objects is right; Structure after system makes full use of whole star mechanism deploying sets up thick chi distance, then utilizes the thin survey chi determination accurate distance of high frequency lasers intensity modulated, simplifies system difficulty; System adopts the anti-face type distortion pushing away large-scale antenna target of array dot matrix target detection, different measuring points conversion is realized by photoswitch, global measuring can be carried out to all monitoring points, also can carry out single unique point height refresh rate and measure, meet the demand of different task.
Accompanying drawing explanation
Fig. 1 is the distributed high-accuracy laser on-line measurement system fundamental diagram of one embodiment of the invention;
Fig. 2 is signal transacting and the control system fundamental diagram of the distributed high-accuracy laser on-line measurement system of one embodiment of the invention;
Fig. 3 is the topology layout schematic diagram of distributed high-accuracy laser on-line measurement system on whole star of one embodiment of the invention.
Embodiment
The present invention adopt semiconductor laser just/cosine intensity modulated, fiber beam splitting is launched, the method that the photoswitch time-division controls, by the reflection of the small pyramid reflecting body of measurement point, receive and dispatch the optical antenna unit put altogether and receive echo, carry out difference frequency digital phase detection with reference signal, obtain high-resolution range information, and then resolve antenna plane degree and torsion resistance by multiple spot range data, meet whole star to the demand of the real-time distortion measurement of the development mechanisms such as antenna.
Active/standby LASER Light Source required for the present invention adopts semiconductor laser, and its inside have employed TEC Peltier temperature control system to ensure the stable of luminous power, laser instrument is carried out to the strength of current modulation of 100MHz, produces the Emission Lasers of phase measuring system.
Low noise photodetector is adopted to carry out strength investigation to echoed signal, by automatic growth control (AGC) circuit, echo signal is effectively amplified, after signal after amplification and reference signal carry out analog frequency mixing, adopt low speed, large figure place AD acquisition chip, simulating signal is converted to digital signal.Utilize the FPGA in device to realize storing, and carry out correlated digital phase demodulation with another reference signal, calculate the accurate distance of cooperative target according to identified result.
System is opened the light by certain sequential control multi-path light, realizes opening and closing multichannel transmitting-receiving light path, and then realizes the subsequent detection to cooperation impact point battle array, certainly, also can carry out high refresh rate accurately detecting to interested single-point.
System difference frequency phase demodulation detection operations principle is as follows, and systems radiate light signal strength can be expressed as
Wherein, A is utilizing emitted light signal intensity, ω
2for the frequency of utilizing emitted light modulation signal,
for radiative phase place, photoelectric detector to return signal light intensity be
Wherein, B is receiving optical signals intensity,
for receiving the phase differential of light echo and utilizing emitted light signal.Reference signal 1 can be expressed as
Wherein, A
1for reference signal intensity, ω
1for the frequency of reference signal,
for the initial phase of reference signal.Reference signal 1 and receiving optical signals are carried out mixing, obtains output low frequency signal
Wherein, D is mixed frequency signal intensity.The reference signal 2 generated can be expressed as
Wherein, E is the intensity of reference signal 2.From formula (4) and formula (5): the phase differential of two low frequency signals obtained after difference frequency is the same with the phase differential of the high-frequency modulation signal directly measured before mixing.Like this, no matter how light chi frequency converts, and can ensure that the signal after mixing is a low frequency and frequency is certain value, is convenient to the accuracy of detection ensureing phase place.
Below in conjunction with accompanying drawing, technical scheme of the present invention is described in detail.
Please refer to the fundamental diagram of the distributed high-accuracy laser on-line measurement system of the one embodiment of the invention shown in Fig. 1.
In distributed high-accuracy laser on-line measurement system provided by the invention, comprising: active/standby Emission Lasers source 1 and modulation drive system 10, described Emission Lasers light source 1 is the continuous wave laser after sinusoidal wave (or cosine wave (CW)) intensity modulated.Active/standby Emission Lasers source 1 emergent light is combined into light beam via after optics bundling device 2, so just can realize the cold and hot backup of Emission Lasers; Closing the Emission Lasers after bundle via optical transmitting and receiving switch---optical circulators 3 carries out the transceiver insulation of Emission Lasers, is then divided into multichannel Emission Lasers by optical beam-splitter 4 more than a point.Emission Lasers is controlled by array of photoswitch 5, produce multi-pass Emission Lasers, each road Emission Lasers all has a dual-mode antenna corresponding with it, multiple dual-mode antenna forms dual-mode antenna array 6 jointly, dual-mode antenna array 6 and cooperative target array 7 combine layout one to one according to the geometric position preset, to meet the demand that face type is measured.Cooperative target array 7 is made up of small corner cube reflector, the function that the light that irradiation enters can be reflected back by parallel light path direction Yuan Lu by this corner cube reflector, reflected light is equally via being transferred to photodetector 8 by optical circulators 3 after above-mentioned optical system and being converted to electric signal.Described photoelectric conversion signal is resolved by signal transacting and control system 9, thus obtains the accurate distance information of target, goes out the deflection of antenna surface type through algorithm process later evaluation.
In the present embodiment, described active/standby part LASER Light Source 1 is the semiconductor laser that maturity is high, the life-span is long, and modulation drive system is just/cosine intensity modulated.Described active/standby Emission Lasers source 1 adopts active/standby part semiconductor laser as transmitting illuminant, the reliability of operation on orbit when abundant guarantee system is long, and active/standby part semiconductor laser realizes closing bundle by optics bundling device 2, do not need to adopt active device to control, further increase the reliability of system.
Described active/standby part LASER Light Source 1 emergent light closes light via the optics bundling device of 50:50, and shoot laser can be divided into the two-way light of 50:50 equally, and when system luminous power is enough, subsequent optical path only can adopt a wherein road; If luminous power is inadequate, an optical circulators can be adopted more to add photodetector, realize the detection to different dual-mode antenna array light path respectively.
Described optical circulators 3 is passive optical transceiving device, its function class is like microwave transmitting and receiving (TR) assembly, this optical circulators 3 has very high optical transmission direction (being greater than 60dB) and isolation (being greater than 55dB), can ensure the good separation of receiving and dispatching light path.
The described light array 5 that opens the light adopts MEMS (MEMS (micro electro mechanical system)) photoswitch, control signal rising time short (being less than 0.5ms), and passage can reach more than 1 × 32, meets the order handover measurement demand of system to multiple target.
The aerial array number of described dual-mode antenna array 6 is consistent with cooperative target array 7 number, and both direct one_to_one corresponding after mechanism deploying, transmitting-receiving optical antenna beam divergence angle size can be out of shape the target azimuth skew caused by covered structure, makes cooperative target can not offset out the visual field of emitting antenna.Described array of photoswitch 5 can be relations one to one with dual-mode antenna array 6 and cooperative target array 7.
Described cooperative target array 7 have employed optics pyramid reflecting body, former for the laser instrument launched road reflected in parallel can be returned, and for two (many) wavelength lasers layout of system on it, have employed the coating technique of different film system, to ensure that the laser meeting different wave length can be reflected back on former road, and the laser do not met the demands cannot be reflected back on former road.
Described photodetector 8 can be photoelectric sensor assembly, and it has signal pre-amplification function, can realize the elementary amplification to feeble signal.
Described modulation drive system 10 is High-speed Electric intensity of flow modulating system, the light intensity of just/cosine signal to Output of laser is at a high speed adopted to modulate, modulating frequency can reach 100MHz, can ensure that phase method surveys dipstick metering journey shorter (1.5m), under identical phase place precision of phase discrimination, range resolution is higher, and the fuzzy distance exceeding this thin survey chi carries out ambiguity solution by system mounting distance, under the conventional numerical precision of phase discrimination level of domestic 0.01 ° at present, the measuring accuracy of 42 μm can be reached, and external high-precision digital phase discriminator can accomplish 0.001 °, corresponding distance accuracy is 4.2 μm.
Please refer to signal transacting and the control system fundamental diagram of the one embodiment of the present of invention shown in Fig. 2, described signal transacting and control system 9 comprise further:
DDS hardware module 91, major function comprises and produces emitted luminescence intensity modulation signal and produce the reference signal of launching modulation signal, is used for assessing the phase shift of echoed signal; Launch modulation module 92, by connecting the main signal generation module 911 in DDS hardware module 91, main pre-service and the amplification realizing transmitting modulation signal, to drive active/standby Emission Lasers source 1; Signal reception pretreatment module 93, carries out the pre-service such as filtering, amplification, comprising functions such as AGC automatic gains for the signal received photodetector 8; Frequency mixing module 94, analog frequency mixing process is carried out for the heliogram that obtains Signal reception pretreatment module 93 and a reference signal generation module 912, and then realize the down coversion of heliogram, this process can ensure the phase invariant of signal, carry out phase demodulation to this low frequency signal, measuring accuracy can significantly promote; An AD sampling module 95, for carrying out sampling processing to the low frequency signal after frequency mixing module 94, to realize analog/digital conversion function; Another AD sampling module 96, for sampling to another reference signal generation module 913, to realize analog/digital conversion function.Have employed low sampling rate, AD sampling module that figure place is large in the present invention, is ensure signal transacting precision, sample frequency should ensure as far as possible be echoed signal complete cycle doubly.
Be provided with FPGA hardware module 97 in the present embodiment, be mainly used in signal transacting and the functions such as solving target distance, specifically comprise correlator phase discriminator module 971, mainly realize the digital phase detection function of AD sampling module 95 and AD sampling module 96; Distance resolves module 972, mainly carries out according to phase place identified result the function that distance resolves; Host computer communication module 973, major function communicates with master system; Time-sequence control module 974, mainly carries out switch control rule to array of photoswitch 5, to reach the effect controlling different light paths and realize measuring.
Please refer to the topology layout schematic diagram of distributed high-accuracy laser on-line measurement system on whole star of the one embodiment of the invention shown in Fig. 3.
In the present invention, the structure after system makes full use of whole star mechanism deploying sets up thick chi distance, then utilizes the thin survey chi determination accurate distance of high frequency lasers intensity modulated, simplifies system difficulty.
System adopts the staggered mode of irradiating (see accompanying drawing 3) Target Aerial Array of dual wavelength dual-support structure, and far field objects can be avoided the staggered interference problem between different transmit antennas, effectively improves the ability of system Chinese People's Anti-Japanese Military and Political College type antenna mechanism distortion interference.When not adopting this measure, utilizing emitted light beam divergence angle the permitted maximum range is
Wherein, H is the vertical height of transmitting-receiving optical antenna apart from target dot matrix, and L is the distance of transmitting-receiving optical antenna apart from target, D
1for target A
1with adjacent target A
2between fore-and-aft distance.After adopting the staggered irradiation of dual wavelength dual-support structure, systems radiate light beam divergence angle the permitted maximum range is
Wherein, D
2for target A
1with target A
4between fore-and-aft distance.There is D under normal circumstances
2=4D
1, and
therefore approximate have θ
2=4 θ
1, the systems radiate light angle of divergence increases 4 times, and allow antenna deformation amount also by increase 4 times, this will be significantly when large scale antenna measurement.
To sum up, the present invention efficiently solves the problem that the mechanisms such as the large-scale deployable antenna of satellite (as SAR) are out of shape measurement in real time in-orbit.Measuring system does not adopt any movable part, and reliability is high, and have employed Double redundancy backup in key component, possesses the power degeneration ability compensating long-term work, is adapted to the strict demand of high rail long-life satellite; System adopts dual wavelength dual-support structure staggered irradiation layout, effectively avoids the staggered interference problem that far field objects is right; System adopts the anti-face type distortion pushing away large-scale antenna target of array dot matrix target detection, realizes different measuring points conversion, can carry out global measuring to all monitoring points, also can carry out single unique point height refresh rate and measure, meet the different needs by photoswitch.The distortion in-orbit that the present invention can be widely used in the mechanisms such as the large-scale deployable antenna of satellite is measured in real time.
In sum, a kind of distributed high-accuracy laser on-line measurement system for large-scale antenna development mechanism provided by the invention, employing semiconductor laser is modulated, fiber beam splitting is launched, the method that the photoswitch time-division controls, by the small pyramid reflection of measurement point, receive and dispatch the receiving element put altogether and receive echo, just can carry out digital phase detection to difference frequency signal, obtain high-resolution range information, and then resolve antenna plane degree and torsion resistance by multiple spot range data.By high-frequency range observation, native system also can carry out high refresh rate and high-precision measurement, for vibration compensation provides valid data to point of fixity.
In the present invention, overall measurement system does not adopt any movable part, and reliability is high; Double redundancy backup is have employed at key component-light source, can direct hot and cold switching, possess the power degeneration ability compensating long-term work, thus native system is adapted to the strict demand of long-life satellite to measuring system.System can carry out global measuring to all monitoring points on large-scale antenna, partial points circulation is measured, unique point high precision height refresh rate (being greater than 200Hz) is measured, and meets the demand of different task.When carrying out the measurement of high refresh rate for unique point, the rumble spectrum of antenna can be obtained, for carrying out Active vibration suppression to antenna mechanism provides possibility in real time.System employing dual wavelength dual-support structure interlocks and irradiates the mode of Target Aerial Array, and far field objects can be avoided the staggered interference problem between different transmit antennas, effectively improves the ability of system Chinese People's Anti-Japanese Military and Political College type antenna mechanism distortion interference.Implemented by the design, effectively can increase the structural deformation amount tolerance of 4 times.
Although content of the present invention has done detailed introduction by above preferred embodiment, will be appreciated that above-mentioned description should not be considered to limitation of the present invention.After those skilled in the art have read foregoing, for multiple amendment of the present invention and substitute will be all apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (8)
1. a distributed high-accuracy laser on-line measurement system, is characterized in that, comprising:
Active/standby Emission Lasers source (1) and modulation drive system (10), described modulation drive system (10) adopts just/cosine signal to modulate to the light intensity of described active/standby Emission Lasers source (1) Output of laser;
Optics bundling device (2), is combined into light beam by the emergent light of described active/standby Emission Lasers source (1);
Optical circulators (3) is as optical transmitting and receiving switch, and the Emission Lasers after involutory bundle carries out transceiver insulation;
Optical beam-splitter (4), is divided into multichannel utilizing emitted light by Emission Lasers;
Array of photoswitch (5), controls the Laser emission of different emitting light path;
Dual-mode antenna array (6), is respectively equipped with a corresponding dual-mode antenna to each road Emission Lasers;
Cooperative target array (7), itself and dual-mode antenna array (6) are according to the corresponding layout in the geometric position preset, described cooperative target array (7) is small corner cube reflector array, and described corner cube reflector is reflected back original place by irradiating the light entered by parallel light path direction;
Photodetector (8), the reflected light being transferred to this photodetector (8) via described optical circulators (3) is converted to electric signal by it;
Signal transacting and control system (9) resolve process to electric signal, obtain the accurate distance information of Target Aerial Array.
2. distributed high-accuracy laser on-line measurement system as claimed in claim 1, is characterized in that,
Described signal transacting and control system (9) comprising:
DDS hardware module (91), for generating various signal source, wherein comprises further:
Main signal generation module (911), for generation of emitted luminescence intensity modulation signal;
First reference signal generation module (912), for generation of the reference signal of launching modulation signal;
Second reference signal generation module (913), for generation of reference phase signal, to assess the phase shift of echoed signal;
Launch modulation module (92), it connects main signal generation module (911), for realizing the pre-service of launching modulation signal, to drive active/standby Emission Lasers source (1);
Signal reception pretreatment module (93), the signal for receiving described photodetector (8) comprise filtering, amplification pre-service and realize AGC automatic gain;
Frequency mixing module (94), carries out analog frequency mixing process for the signal that obtains Signal reception pretreatment module (93) and the first reference signal generation module (912), realizes the down coversion of heliogram;
One AD sampling module (95), carries out sampling processing, to realize analog/digital conversion for the low frequency signal produced frequency mixing module (94);
2nd AD sampling module (96), for sampling to the second reference signal generation module (913), to realize analog/digital conversion;
FPGA hardware module (97), for signal transacting and solving target distance, comprises further:
Correlator phase discriminator module (971), for realizing the digital phase detection function of an AD sampling module (95) and the 2nd AD sampling module (96);
Distance resolves module (972), resolves for carrying out distance according to phase place identified result;
Host computer communication module (973), is used for communicating with master system;
Time-sequence control module (974), is used for carrying out switch control rule to array of photoswitch (5), realizes measuring to control different light paths.
3. distributed high-accuracy laser on-line measurement system as claimed in claim 1, is characterized in that,
Described active/standby Emission Lasers source (1) adopts active/standby part semiconductor laser as transmitting illuminant, and closes light by the optics bundling device (2) of 50:50.
4. distributed high-accuracy laser on-line measurement system as claimed in claim 1, is characterized in that,
Described array of photoswitch (5) adopts MEMS optical switch, and control signal rising time is less than 0.5ms, and passage is more than 1 × 32.
5. distributed high-accuracy laser on-line measurement system as claimed in claim 1, is characterized in that,
Described dual-mode antenna array (6) number is consistent with cooperative target array (7) number, and both direct one_to_one corresponding after mechanism deploying, transmitting-receiving optical antenna beam divergence angle size can be out of shape the target azimuth skew caused by covered structure, makes cooperative target can not offset out system visual field.
6. distributed high-accuracy laser on-line measurement system as claimed in claim 1, is characterized in that,
The modulating frequency of described modulation drive system (10) is 100MHz.
7. distributed high-accuracy laser on-line measurement system as claimed in claim 1, is characterized in that,
System adopts dual wavelength dual-support structure staggered irradiation Target Aerial Array.
8., as the distributed high-accuracy laser on-line measurement system in claim 1 ~ 7 as described in any one, it is characterized in that,
Described distributed high-accuracy laser on-line measurement system is used for the large-scale deployable antenna mechanism of satellite.
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| CN106291579A (en) * | 2016-08-31 | 2017-01-04 | 湖北久之洋红外系统股份有限公司 | A kind of laser detection system having cooperative target |
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