CN101114959A - Wireless LAN control system of large-scale astronomical telescope - Google Patents
Wireless LAN control system of large-scale astronomical telescope Download PDFInfo
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- CN101114959A CN101114959A CNA2007100261726A CN200710026172A CN101114959A CN 101114959 A CN101114959 A CN 101114959A CN A2007100261726 A CNA2007100261726 A CN A2007100261726A CN 200710026172 A CN200710026172 A CN 200710026172A CN 101114959 A CN101114959 A CN 101114959A
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Abstract
The invention relates to a wireless local-area network control system of large astronomical telescopes, aiming to provide a TCS control system based on the wireless local-area network and to provide powerful, real-time and wireless control for the whole telescope system. The system comprises a main control system and a local control system; the main control system comprises a server, a switch, and a PC; the local system comprises a lower computer (LCU) and an actuator and adopts an RS485 bus network structure; the connection of wireless connection system is adopted between the main control system and the local control system; the wireless connection system is a wireless local-area network system which adopts an 802.11a agreement, and consists of a wireless network card, a wireless access point, a wireless controller, and a switch; the lower computer is connected with the wireless access point via the wireless network card; the wireless access point is connected with the server and the PC via the wireless controller.
Description
Technical field
The present invention relates to the control system of large-scale astronomical telescope, particularly Wireless LAN control system of large-scale astronomical telescope.
Background technology
The control system of large-scale astronomical telescope (TCS) is the system of a complexity, includes pointing of the telescope and tracking control system, force actuator control system, displacement actuator control system and dome control system etc.By force actuator control system and displacement actuator system, can overcome thin mirror surface spliced telescope minute surface error, telescopical picture element is improved, make the construction of large-scale astronomical telescope become possibility.Da Tian district area multiple target fiber spectrum astronomical telescope (hereinafter to be referred as LAMOST) is spliced into Schmidt corrector M by 24 sub-mirrors of hexagon respectively
ABe spliced into primary mirror sphere M with 37 sub-mirrors of hexagon
BForm.M
AAnd M
BEach piece mirror respectively by three displacements of cover displacement actuators control minute surface, totally 183 covers.M
AEvery sub-mirror under be equipped with 34 the cover force actuators, totally 816 the cover.The sub-mirror of large-scale astronomical telescope can expand to thousands of, and displacement control and sub-mirror Deformation control is concentrated in the same control system finish simultaneously.Bring the quantity of controlling object to reach unprecedented huge degree thus, this has proposed great challenge to telescope control system.
Existing telescope control system all adopts Ethernet control or total line traffic control, and the controlled cell number has several thousand even up to ten thousand individual in the control system, and control system network engineering difficulty is big, and especially the engineering wiring is more complicated in limited scope.All pass through wired connection between master controller and the local control unit, and telescope will be done to point to and pursuit movement because of following the tracks of celestial body, too many wiring has brought inconvenience for telescopical control and motion.
Along with the development of radio network technique, make realization become possibility based on the large-scale astronomical telescope control system of wireless network.
But there is following difficult point in telescopical controlled in wireless:
1, controlled object quantity is very big, and is thousands of, and distribution is very limited, general in tens meters scope;
2, controlled object poor anti jamming capability is difficult for adopting the high-power wireless emitter, and radio communication is subject to disturb simultaneously;
3, telescope control system requires height to real-time and accuracy, requires the network response speed fast, transmits data and accurately reaches the reliability height;
4, wireless device is shared wireless communication medium in the WLAN, when same access point access wireless device is too much (general tens), because of competitive resource must influence communication performance with tight, reduces communication and response speed;
5, have the phase mutual interference between the WAP (wireless access point) (AP), when a plurality of AP channel overlaps and overlapped coverage, mutual serious interference can not proper communication;
Existing comparatively general WLAN (wireless local area network) WLAN is 802.11b or 802.11g, all uses the 2.4G frequency range, has only three non-overlapped channels, is subject to the interference from radio telephone and microwave.
Summary of the invention
The objective of the invention is to, overcome the difficult point of telescopical controlled in wireless, a kind of TCS based on WLAN (wireless local area network) (Wireless Local Network-WLAN) (being called for short WTCS) is provided control system, provides strong, real-time and wireless control whole telescopic system.
Technical scheme of the present invention is: a kind of Wireless LAN control system of large-scale astronomical telescope, and by master control system and local control system, described master control system comprises server, switch and PC, adopts the Fast Ethernet network configuration; Described local control system comprises slave computer (LCU), actuator, adopts RS485, bus network; Adopt wireless connection system to be connected between described master control system and the local control system, described wireless connection system is made up of wireless network card, WAP (wireless access point), wireless controller and switch for the wireless local area network (WLAN) system of employing 802.11a Internet protocol; Described slave computer is connected with described WAP (wireless access point) by described wireless network card, described WAP (wireless access point) is connected with described server and PC by described wireless controller, or inserts described switch by described wireless controller and be connected with described server and PC.
Described LAN system adopts 802.11a WLAN structure, satisfies stability, anti-interference and the transmission speed of system.IEEE 802.11a has 12 channels, and channel is respectively: 5.15～5.25GHz4 channel; 5.25 4 channels of～5.35GHz; 5.725 4 channels of～8.725GHz.802.11a adopt Orthodoxy Frequency Division Multiplex (OFDM) modulation technique, have stronger antijamming capability and transmittability at a high speed.Select 5.725～5.825 4 channels in this method for use, because controlled unit number is more in displacement and the force actuator control system, wherein two channels are used for displacement and force actuator control, and two are used for other control in addition, and each channel is corresponding to a network.Set the SSID that each LCU connects, the fixed-site of controlled object actuator in telescope control system, limiting network roaming.And as a further improvement on the present invention, adopt directional antenna among the AP, be modulated into the strip coverage, avoid the phase mutual interference.
Be provided with RTLinux operating system in the described slave computer (LCU), in LCU, adopt RTLinux, the demand of adaptive system real-time response.
Be provided with Red Hat Linux 9 operating systems in the described server; Be provided with Red HatLinux 9 operating systems among the described PC.
As a further improvement on the present invention, in the described wireless connection system, adopt the round-robin algorithm to carry out polling communication between described AP and the local control system.In telescope control system, what server mainly sent is control information, and each data volume that sends is also little, and the radio reception device distribution density is big simultaneously, and quantity is big in the limited range.Professional at the real-time telescope control of uncontested type, adopt WAP (wireless access point) (AP) centralized control of point coordination function (PCF) to insert algorithm, AP gives each slave computer by polling mode with the data transmission route, thereby use channel uncontestedly, determine each node access order and time by AP, and exchange control frame information.
As a further improvement on the present invention, network communication mode adopts asynchronous Non-Blocking I/O (AIO) model to realize communication between server end and slave computer end point-to-point.Asynchronous Non-Blocking I/O (AIO) model is a kind of processing and the overlapping model that carries out of I/O, uses asynchronous I/O to carry out processing and I/O operation overlap, makes up the application program that I/O speed is faster, efficient is higher.Server requests is after successfully initiating, and request can be returned immediately, finishes read/write operation on the backstage, and application program is carried out other then and handled operation.When the response of I/O arrives, will produce a signal or carry out a call back function and finish current I/O processing procedure based on thread.In asynchronous Non-Blocking I/O, can initiate a plurality of transmission operations simultaneously, can use available cpu resource more efficiently.In AIO, utilize aiocb (AIO I/O Control Block) structure, this structure has comprised all information of relevant transmission, and the aio_read function request is carried out asynchronous read operation to an effective filec descriptor, and the aio_write function is used for asking an asynchronous write operation.
Described Wireless LAN control system of large-scale astronomical telescope also comprises the execution following steps:
1. server receives the data that obtain by detection system, handles the size that computing obtains the power that each actuator should add;
2. server adopts asynchronous Non-Blocking I/O to send data to each LCU successively;
Communicate by letter 3.AP adopt between PCF mode and the LCU;
4.LCU the reception data according to command format, send execution command to affiliated actuator;
5. actuator returns to LCU with execution result, and LCU passes AP back by wireless mode;
6. the asynchronous reading of data of server;
7. this communication process finishes.
The present invention compared with prior art has following advantage:
1. it is convenient to install.Removed or reduced numerous and diverse network layout from, laid several access points (AccessPoint) equipment and just can set up the whole regional area network of covering.
2. be easy to expansion, minimizing system control complexity can be selected flexibly.
Description of drawings
Fig. 1 is the embodiment of the invention 1 a Wireless LAN control system of large-scale astronomical telescope structured flowchart
Fig. 2 is that server adopts asynchronous Non-Blocking I/O to send the flow chart of data to each LCU in the embodiment of the invention 1
Fig. 3 is asynchronous Non-Blocking I/O illustraton of model that server adopts in the embodiment of the invention 1
Fig. 4 is a control system control flow chart in the embodiment of the invention 1
Embodiment
LAMOST M
A34 cover force actuators are housed under the every sub-mirror, have 816 cover force actuators under 24 sub-mirrors, control this 816 cover force actuator by 120 cover LCU, its control system is as follows:
As shown in Figure 1, a kind of Wireless LAN control system of large-scale astronomical telescope comprises master control system 1 and local control system 2, and master control system comprises server, switch and PC, adopts the Fast Ethernet network configuration; Local control system comprises slave computer (LCU) and actuator, adopts the RS485 bus network; Adopt wireless connection system to be connected between master control system and the local control system, wireless connection system is made up of wireless network card, WAP (wireless access point), wireless controller and switch for the wireless local area network (WLAN) system of employing 802.11a Internet protocol; Slave computer is connected with WAP (wireless access point) by wireless network card, and WAP (wireless access point) is connected with PC by wireless controller, and WAP (wireless access point) is connected with server and PC by the wireless controller access switch again.
Wireless local area network (WLAN) system adopts 802.11a WLAN structure, satisfies stability, anti-interference and the transmission speed of system.IEEE 802.11a has 12 channels, and channel is respectively: 5.15～5.25GHz4 channel; 5.25 4 channels of～5.35GHz; 5.725 4 channels of～8.725GHz.802.11a adopt Orthodoxy Frequency Division Multiplex (OFDM) modulation technique, have stronger antijamming capability and transmittability at a high speed.Select 5.725～5.825 4 channels in this method for use, because controlled unit number is more in displacement and the force actuator control system, wherein two channels are used for displacement and force actuator control, and two are used for other control in addition, and each channel is corresponding to a network.Set the SSID that each LCU connects, the fixed-site of controlled object actuator in telescope control system, limiting network roaming.
As shown in Figure 4, the Wireless LAN control system of large-scale astronomical telescope control procedure may further comprise the steps:
1. server receives the data that obtain by detection system, handles the size that computing obtains the power that each actuator should add;
2. server adopts asynchronous Non-Blocking I/O to send data to each LCU successively;
Communicate by letter 3.AP adopt between PCF mode and the LCU;
4.LCU the reception data according to command format, send execution command to affiliated actuator;
5. actuator returns to LCU with execution result, and LCU passes AP back by wireless mode;
6. the asynchronous reading of data of server;
7. this communication process finishes.
Command format in the above-mentioned steps 4 comprises command formats such as sub-mirror number, LCU ID, open loop or closed-loop control order, power value, step number.
AP adopts between PCF mode and the LCU and communicates by letter: AP gives each slave computer by polling mode with the data transmission route, and slave computer uses channel uncontestedly, determines each node access order and time by AP, and exchange control frame information.
As shown in Figure 2, server adopts asynchronous Non-Blocking I/O as follows to the flow process that each LCU sends data:
Server end:
1) server is created the TCP socket;
2) bundling port number (5790);
3) the monitoring wireless network connects;
4) accept from the LCU data;
5) asynchronous reading and writing data;
6) deal with data;
7) change step 3) over to.
Client:
I. create the TCP socket;
Ii. Connection Service device;
Iii. read data;
Iv. deal with data;
V. write data;
Vi. finish.
As shown in Figure 3, asynchronous Non-Blocking I/O (AIO) model that server adopts is as follows: server requests is after successfully initiating, and request can be returned immediately, finishes read/write operation on the backstage, and application program is carried out other then and handled operation.When the response of I/O arrives, will produce a signal or carry out a call back function and finish current I/O processing procedure based on thread.In asynchronous Non-Blocking I/O, can initiate a plurality of transmission operations simultaneously, can use available cpu resource more efficiently.In AIO, utilize aiocb (AIO I/O Control Block) structure, this structure has comprised all information of relevant transmission, and the aio_read function request is carried out asynchronous read operation to an effective filec descriptor, and the aio_write function is used for asking an asynchronous write operation.
Claims (8)
1. Wireless LAN control system of large-scale astronomical telescope, by master control system and local control system, described master control system comprises server, switch and PC, adopts the Fast Ethernet network configuration; Described local control system comprises slave computer (LCU), actuator, adopts the RS485 bus network; It is characterized in that: adopt wireless connection system to be connected between described master control system and the local control system, described wireless connection system is made up of wireless network card, WAP (wireless access point), wireless controller and switch for adopting the wireless local area network (WLAN) system of 802.11a Internet protocol; Described slave computer is connected with described WAP (wireless access point) by described wireless network card, described WAP (wireless access point) is connected with described server and PC by described wireless controller, or inserts described switch by described wireless controller and be connected with described server and PC.
2. Wireless LAN control system according to claim 1 is characterized in that: be provided with RTLinux operating system among the described LCU.
3. Wireless LAN control system according to claim 1 is characterized in that: this control system is carried out following steps:
1) server receives the data that obtain by detection system, handles the size that computing obtains the power that each actuator should add;
2) server adopts asynchronous Non-Blocking I/O to send data to each LCU successively;
3) AP adopts between PCF mode and the LCU and communicates by letter;
4) LCU receives data, according to command format, sends execution command to affiliated actuator;
5) actuator returns to LCU with execution result, and LCU passes AP back by wireless mode;
6) the asynchronous reading of data of server;
7) this communication process finishes.
4. Wireless LAN control system according to claim 1, it is characterized in that: described WAP (wireless access point) adopts between PCF mode and the LCU and communicates by letter: WAP (wireless access point) is given each slave computer by polling mode with the data transmission route, determine each slave computer access order and time by WAP (wireless access point), and exchange control frame information.
5. Wireless LAN control system according to claim 1 is characterized in that: institute's server adopts asynchronous Non-Blocking I/O mode to send data to each LCU.
6. Wireless LAN control system according to claim 1 is characterized in that: described WAP (wireless access point) adopts directional antenna, is modulated into the strip coverage.
7. Wireless LAN control system according to claim 3 is characterized in that: the command format above-mentioned steps 4) comprises the command format of sub-mirror number, LCU ID, open loop or closed-loop control order, power value, step number.
8. Wireless LAN control system according to claim 3 is characterized in that: institute's server adopts asynchronous Non-Blocking I/O mode when each LCU sends data, carries out the following step:
Server end:
1) server is created the TCP socket;
2) bundling port number (5790);
3) the monitoring wireless network connects;
4) accept from the LCU data;
5) asynchronous reading and writing data;
6) deal with data;
7) change step 3) over to.
Client:
I. create the TCP socket;
Ii. Connection Service device;
Iii. read data;
Iv. deal with data;
V. write data;
Vi. finish.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2007100261726A CN100561967C (en) | 2007-08-17 | 2007-08-17 | Wireless LAN control system of large-scale astronomical telescope |
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| CNB2007100261726A CN100561967C (en) | 2007-08-17 | 2007-08-17 | Wireless LAN control system of large-scale astronomical telescope |
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| CN101114959A true CN101114959A (en) | 2008-01-30 |
| CN100561967C CN100561967C (en) | 2009-11-18 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101242429B (en) * | 2008-03-14 | 2011-08-03 | 中国科学院国家天文台南京天文光学技术研究所 | Telescope mobile control system based on Java |
| CN102346469A (en) * | 2011-08-12 | 2012-02-08 | 中国科学院光电技术研究所 | Distribution control method and system for large-scale photoelectric telescope lens mechanism |
| CN102566553A (en) * | 2012-02-08 | 2012-07-11 | 中铁科工集团有限公司 | Outdoor construction equipment wireless network control system on basis of private protocol |
| CN102571283A (en) * | 2012-01-19 | 2012-07-11 | 神州数码网络(北京)有限公司 | Method and system for testing message of wireless network device |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1129019C (en) * | 2001-06-05 | 2003-11-26 | 中国科学院国家天文台南京天文光学技术研究所 | Electric control system of force actuator in large astronomic telescope |
| WO2004107012A1 (en) * | 2003-05-30 | 2004-12-09 | Vixen Co., Ltd. | Automatic introduction system of celestial body |
| CN1313859C (en) * | 2004-03-23 | 2007-05-02 | 中国科学院国家天文台南京天文光学技术研究所 | Active optical active supporting electrocontrolling system for astronomical telescope |
| CN1770807B (en) * | 2005-10-08 | 2010-05-05 | 中国科学院国家天文台南京天文光学技术研究所 | Wireless communication system in astronomical telescope |
-
2007
- 2007-08-17 CN CNB2007100261726A patent/CN100561967C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101242429B (en) * | 2008-03-14 | 2011-08-03 | 中国科学院国家天文台南京天文光学技术研究所 | Telescope mobile control system based on Java |
| CN102346469A (en) * | 2011-08-12 | 2012-02-08 | 中国科学院光电技术研究所 | Distribution control method and system for large-scale photoelectric telescope lens mechanism |
| CN102346469B (en) * | 2011-08-12 | 2014-03-05 | 中国科学院光电技术研究所 | Distribution control method and system for large-scale photoelectric telescope lens mechanism |
| CN102571283A (en) * | 2012-01-19 | 2012-07-11 | 神州数码网络(北京)有限公司 | Method and system for testing message of wireless network device |
| CN102566553A (en) * | 2012-02-08 | 2012-07-11 | 中铁科工集团有限公司 | Outdoor construction equipment wireless network control system on basis of private protocol |
| CN102566553B (en) * | 2012-02-08 | 2014-01-15 | 中铁科工集团有限公司 | Outdoor construction equipment wireless network control system on basis of private protocol |
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| CN100561967C (en) | 2009-11-18 |
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