CN1340700A - Measuring and control system using network technique for multi-wavelength laser radar - Google Patents
Measuring and control system using network technique for multi-wavelength laser radar Download PDFInfo
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- CN1340700A CN1340700A CN00123648A CN00123648A CN1340700A CN 1340700 A CN1340700 A CN 1340700A CN 00123648 A CN00123648 A CN 00123648A CN 00123648 A CN00123648 A CN 00123648A CN 1340700 A CN1340700 A CN 1340700A
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Abstract
A measuring and control system using the network technique for multi-wavelength laser radar has a data receiver system and control unit, which is composed of data acquisition unit, control unit, photon counting unit, standard serial interface unit, connecting embedded system between control unit channels and photon counting unit and standard serial interface, and parallel interface between receiving channels or control unit and the said embedded system. It features that the data exchange between primary computer and other units are performed over network.
Description
The present invention relates to atmospheric pollution detection technique field.Especially, relate to a kind of lidar measurement and control device that is used for adopting in atmospheric sounding ozone and the aerocolloidal multi-wavelength laser radar of stratosphere network technology.
Fig. 1 is the General Principle block scheme of laser radar, and laser transmitting system comprises laser instrument, transmitter-telescope etc.Wherein, transmitter-telescope is used for improving the Laser emission signal.Laser when transmitting, is subjected to the decay and the scattering of atmospheric medium through transmitter-telescope directive atmosphere in atmosphere.Backscatter signal wherein turns back to laser radar.The laser radar receiving system comprises parts such as receiving telescope, opto-electronic conversion and amplification.The laser light scattering signal that turns back to laser radar is received telescope and collects, and through links such as opto-electronic conversion amplifications, again by input and disposal system analysis and processing, obtains our needed atmospheric parameter and procedural information.Control system is synchronous and level, the pitch rotation etc. of the emission and the reception of control laser.
Fig. 2 is the functional-block diagram of ozone and stratospheric aerosol multi-wavelength laser radar in the atmospheric sounding.Among the figure, receiving telescope (1), light hurdle motor (2), smallcolumn diaphragm (3), optical gate blade (4), optical gate motor (5), quasi-optical mirror (6), 308nm light path (7), 355nm light path (8), 1060nm light path (9), 532nm light path (10), polarizing prism (11), 532 horizontal polarizations (12), 532 vertical polarizations (13), 355 transmitter-telescopes (14), 532 transmitter-telescopes (15), 308 transmitter-telescopes (14), 1060 transmitter-telescopes (15).
Ozone and stratospheric aerosol multi-wavelength laser radar are a kind of laser radars with the high power laser emissive ability and the heavy caliber receiving telescope, multi-wavelength (from ultraviolet to infrared) in the described atmospheric sounding, its detectivity is very strong, is the laser radar of present China bore maximum.Described multi-wavelength laser radar has two high power lasers, and wherein the laser of three wavelength of Nd-YAG laser instrument output is respectively 1060nm, 532nm and 355nm; The XeCl laser output wavelength is 308nm.These laser expand bundle and compression angle of divergence directive atmosphere through transmitter-telescope, and receiving telescope is that a bore is Cassegrain's formula telescope of 1 meter, and focus is pulled out by the side commentaries on classics, and an adjustable field stop is arranged at the focus place.The place is provided with optical gate in perifocus, to reduce the switch transit time of optical gate.The different wavelength of laser echo information that beam splitting system is collected laser radar is separated, and on the photosurface of direct light electric transducer.Wherein 308nm, 355nm are ultraviolet band, adopt Detection of Weak Signals technology (photon counting technique) to detect, and 532nm, 1060nm adopt the simulating signal reception technique, and convert digital signal to by high-speed a/d and enter computing machine and carry out signal Processing.532nm has three passages to receive, and wherein has two passages to be used for the detection laser atmosphere polarization information.
Control section comprises optical gate control, laser triggering control, received signal synchro control, telescope focusing control, receives field angle control (change field stop), optical filter selection control and the parallel adjustment of optical axis.Fig. 3 is the general structure synoptic diagram of described laser radar, and wherein, described laser radar comprises, principal computer (1), Laser Power Devices (2), laser instrument (3), optical table (4), transmitter-telescope (5) is adjusted mirror (6), optical table (7), monitor (8), top floor (9), observation dome (10), receiving telescope (11), optical table (12), beam split and receiving system (13), control rack (14), optical gate (15).
Lidar measurement (input and data handling system) is the important component part of laser radar with control system.Needs along with scientific research and atmospheric seeing, the detecting function of laser radar more and more widely, the technology of laser radar also becomes increasingly complex, requirement to measurement and control system is also more and more higher, existing measurement and control system technology can not adapt to the requirement of new laser radar, what existing lidar measurement and control system (see figure 4) adopted is the parallel interface technology, and computing machine is with to measure passage closely linked, and receiving cable and reference mark are also less.
The advantage of parallel interface is that transmission speed is fast, but also has many weak points.Such as, parallel interface need connect tens on lines, and this is comprising address bus, data bus, control bus etc.The distance of these on lines can not be oversize when computer speed is higher, and just transmission range is limited, when computer speed is high more, need the distance of parallel interface transmission just short more, otherwise antijamming capability is also poor more, even can not be connected to beyond the computing machine at all.Another shortcoming of parallel interface is that it must combine with the computer CPU bus, when the computer CPU bus not simultaneously, can not work because of bus incompatibility makes interface probably.That is to say that parallel interface is a special purpose interface.Therefore, do not have a reasonable Centronics interface standard Centronics so far in the world yet.The software section of parallel interface also is the same, and data transmission manner and form generally all are self-editing, also do not have unified standard.At present, technical development of computer is very fast, and computing machine is soft, the cycle of hardware update is shorter and shorter, adopt the equipment of parallel interface be easy to because of improvement of computer science out-of-date.
Multi-wavelength laser radar is a large-scale light, mechanical, electrical integrated scientific research equipment, sees Fig. 2.Its measurement and control system adopts parallel interface just can produce a lot of problems, the operability problem of the problem when reception causes computing machine to strive as hyperchannel, the interference problem that light laser produces, system is (such as surveying the space that ozone and gasoloid multi-wavelength laser radar will take two floors, operating personnel can not look after various aspects simultaneously during observation, see Fig. 3) etc.Also have a problem to be exactly, the life problems of large-scale instrument adopts the parallel interface technology, influences large-scale instrument function development and utilization.
The objective of the invention is to, at the problems referred to above, we have changed the circuit form of employing parallel interface before in lidar measurement and control system, adopted network technology first in laser radar inside, and all data acquisition units and control module are all adopted serial line interface.
Adopt the advantage of serial line interface to be: the on line of data transmission is less, needs only the purpose that several on lines just can reach two-way communication.Its antijamming capability is also strong than parallel interface, and communication distance can be very long, also can reach tens meters recently, and the standard that for example has (as RS-422A) is not having under the situation of modulator-demodular unit communication distance can reach several kilometers far away.Simultaneously, serial line interface has the standard of international uniform, during use, as long as conformance with standard just can connect easily, has formed a kind of novel distributing TT﹠C system.
Utilize serial line interface can grow the characteristics of Distance Transmission, make system decentralized, that is: function dispersion-detection control separates with data processing function, the problem when computing machine of data processing is striven when the Electro Magnetic Compatibility (raising antijamming capability) of region dispersion-enhanced system, the reception of load dispersion-solution hyperchannel, scattered risks-single node fault be little to the influence of complete machine, improved the reliability of complete machine, and made Large Radar have very strong operability.Solved problems such as equipment complexity, operating difficulties, observation data that the large laser radar faced be more difficult preferably, made this laser radar have stronger reliability, operability, maintenanceability and extensibility.Because what adopt is standard interface, when principal computer upgrades or remodels, to not influence of complete machine, the serviceable life and the functional development that help prolonging main equipment.
Fig. 1 represents the General Principle block diagram of existing laser radar;
Fig. 2 represents the functional-block diagram of ozone and stratospheric aerosol multi-wavelength laser radar in the atmospheric sounding;
Fig. 3 represents the general structure synoptic diagram of ozone and stratospheric aerosol multi-wavelength laser radar in the atmospheric sounding;
Fig. 4 represents to adopt in the existing laser radar block diagram of the measurement and control system of parallel interface;
Fig. 5 represents that each Data Receiving passage among the present invention or control module using the connection block diagram that embedded system installs the cell mesh with standard serial interface simultaneously respectively additional;
Fig. 6 represents that the network of laser radar TT﹠C system of the present invention opens up the benefit block diagram;
Fig. 7 represents the circuit block diagram of the multi-channel serial interface card that inserts among the present invention in principal computer.
Below in conjunction with lidar measurement and the control of accompanying drawing to the reception of this Adoption Network of the present invention System is described in detail.
1. data receiver of the present invention and control device have data acquisition unit, control module and Photon counting unit, and the unit with standard serial interface, as shown in Figure 5. Wherein, mould Analog signal receive path (A/D) (data acquisition unit), each control module passage of control system All adopt embedded system in (control module) and the photon counting unit.
The CPU of these embedded systems has Z80, Z64180,8051 etc., owing to adopted embedding System, a large amount of hardware capabilitys change by software to be realized, the unit that makes has automatic decision and processes merit The function of energy has been simplified the control operation of master computer greatly, and each receive path can be to receiving simultaneously Data are carried out respectively preliminary treatment, have alleviated the pressure that the master computer data are processed.
As shown in Figure 5, each Data Receiving passage or control module install serial line interface (CPU of the embedded system that has itself has serial line interface) respectively additional when using embedded system.In these unit, what adopt the connecting of receiving cable or control module and embedded system is parallel interface, and correspondence with foreign country adopts standard serial interface, the unit instrument that these receiving cables or control module is formed respectively have standard serial interface.
2. Data Receiving of the present invention and control device, wherein complete machine data switching networksization.
Exchange data using network technology between principal computer and each unit makes the data communication between a large amount of control informations, data processing of information and principal computer change the standard serial data communication interface into by special-purpose parallel interface.
Owing in this network, will transmit a lot of control informations, singly not that file data transmits, consider the electromagnetic environment of large laser radar work simultaneously, that we adopt is the electric serial data communication interface of the difference balance EIARS-422A with high anti-jamming capacity.
Network topology adopts star structure, and each passage is set up communications protocol respectively, and software generates, changes, safeguards than being easier to.Fig. 6 is that the radar control grid is opened up the benefit block scheme.
3. Data Receiving of the present invention and control device, wherein assembly language software is all adopted in data communication.
Different other networks of laser radar measurement and control network, general text is not only in its transmission, and it also will transmit a lot of control informations.In order to improve the transfer efficiency of this network, all communication softwares of this network all adopt the assembly language programming.
The assemble software of embedded system all solidifies in the EPROM.Because between the principal computer of this network and each unit is direct point-to-point communication, so this network has the time resolution characteristics (network that has has long transmission delay) than piece.
Embodiment
A. insert the multi-channel serial interface card in principal computer, Fig. 7 is 8 channel serial interface card circuit block diagrams.These serial line interfaces all adopt the RS-422A standard.
Among Fig. 7, employed chip 8251 is serial interface chips of standard.
B. install serial line interface (the embedded system CPU that has itself has serial line interface) in each embedded system additional, above-mentioned each road serial line interface all adopts the chip of RS-422A standard.
C. connected networks are set up communications protocol, and the establishment communication software carries out integral united test.
Owing to adopted network technology with embedded system and serial line interface in laser radar of the present invention inside, make the large laser radar have very strong operability, though each component distribution in two floors, as long as operating personnel are before principal computer, just this radar of may command is observed, and sees Fig. 3.
In conjunction with the accompanying drawings the atmospheric sounding ozone and the reception of stratospheric aerosol network technology data that multi-wavelength laser radar adopts and control system of being used for of the present invention is had been described in detail in above-mentioned description, therefore any change and the improvement of having done on basis without departing from the spirit and scope of the present invention for those of ordinary skill in the art all belongs in the described protection domain of claims of the present invention.
Claims (3)
1. a lidar measurement and control system that is used for atmospheric sounding ozone and stratospheric aerosol network technology that multi-wavelength laser radar adopts, it comprises, data receiving system, emission coefficient, the A/D converter unit, control module, interface section and computing machine part is characterized in that described data receiving system and control section have, data acquisition unit, control module and photon counting unit, and unit with standard serial interface, wherein, simulating signal receiving cable (A/D) (data acquisition unit) is connected embedded system between the unit of each control module passage (control module) of control system and photon counting unit and standard serial interface;
When using embedded system, install serial line interface (CPU of the embedded system that has itself has serial line interface) respectively additional.In these unit, what adopt the connecting of receiving cable or control module and embedded system is parallel interface, and correspondence with foreign country adopts standard serial interface, and these serial line interfaces all adopt the RS-422A standard, and employed chip 8251 is serial interface chips of standard;
Exchange data using network technology between principal computer and each unit makes the data communication between a large amount of control informations, data processing of information and principal computer change the standard serial data communication interface into by special-purpose parallel interface.Used serial data communication interface is EIA RS-422A; Network topology adopts star structure, and each passage is set up communications protocol respectively.
2. lidar measurement and the control system that is used for atmospheric sounding ozone and stratospheric aerosol network technology that multi-wavelength laser radar adopts as claimed in claim 1, it is characterized in that, the CPU of described embedded system has Z80, Z64180,8051 standard chips such as grade, assembly language software is all adopted in data communication, in each Data Receiving passage or the control module, what adopt the connecting of receiving cable or control module and embedded system is parallel interface, and correspondence with foreign country adopts standard serial interface, the unit instrument that these receiving cables or control module is formed respectively have standard serial interface, and the assemble software of embedded system all is solidificated in the EPROM.
3. lidar measurement and the control system that is used for atmospheric sounding ozone and stratospheric aerosol network technology that multi-wavelength laser radar adopts as claimed in claim 1, it is characterized in that, the laser radar measurement and control network is different from other network, general text is not only in its transmission, and it also will transmit a lot of control informations.In order to improve the transfer efficiency of this network, all communication softwares of this network all adopt the assembly language programming.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00123648A CN1124495C (en) | 2000-08-24 | 2000-08-24 | Measuring and control system using network technique for multi-wavelength laser radar |
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| CN00123648A CN1124495C (en) | 2000-08-24 | 2000-08-24 | Measuring and control system using network technique for multi-wavelength laser radar |
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| CN1340700A true CN1340700A (en) | 2002-03-20 |
| CN1124495C CN1124495C (en) | 2003-10-15 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1329742C (en) * | 2004-09-30 | 2007-08-01 | 中国科学院安徽光学精密机械研究所 | Laser radar control method based on image intensifier |
| CN100434932C (en) * | 2006-07-06 | 2008-11-19 | 上海交通大学 | Collaborative work of multiple lidars, and dat processing method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100523867C (en) * | 2005-12-07 | 2009-08-05 | 中国科学院自动化研究所 | Laser far-distance automatic detecting method based on inlaying system |
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2000
- 2000-08-24 CN CN00123648A patent/CN1124495C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1329742C (en) * | 2004-09-30 | 2007-08-01 | 中国科学院安徽光学精密机械研究所 | Laser radar control method based on image intensifier |
| CN100434932C (en) * | 2006-07-06 | 2008-11-19 | 上海交通大学 | Collaborative work of multiple lidars, and dat processing method |
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| Publication number | Publication date |
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| CN1124495C (en) | 2003-10-15 |
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