CN1489053A

CN1489053A - High-speed real-time remote-sensing data recorder

Info

Publication number: CN1489053A
Application number: CNA021457239A
Authority: CN
Inventors: 荆麟角; 黄立胜; 刘月花
Original assignee: Institute of Electronics of CAS
Current assignee: Institute of Electronics of CAS
Priority date: 2002-10-09
Filing date: 2002-10-09
Publication date: 2004-04-14
Anticipated expiration: 2022-10-09
Also published as: CN1220141C

Abstract

The data recorder comprises at least one piece of high speed PCI data acquisition card and at least one piece of PCI-SCSI interface card. The data acquisition card collects high-speed data of remote sensor, and stores collected the data through PCI bus to computer dedicated memory buffer area. The PCI-SCSI interface card writes data in computer memory buffer into SCSI storage device with large capacity through PCI bus. Based on PC, the invention realizes portable high speed real time data recorder, providing features of simple structure and easy to carry as well as possessing wide range of usage.

Description

High-speed real-time remotely-sensed data register

Technical field

The present invention relates to high-speed data acquisition territory record, particularly the high-speed real-time remotely-sensed data register of remote sensor.

Background technology

Along with the arrival in digital earth epoch, people adopt more and more advanced remote sensing means to understand and observe our earth and space from various frequency spectrum, from various angle it are carried out deep research.

For this reason, people need at first these a large amount of high-speed data recordings to be got off, and then carry out careful deep research and analysis.

In recent years, along with remote sensor mapping band broadens, the raising of resolving power, the increase of gradation of image level requirements, the remote sensor original data volume increases and data transfer rate improves constantly, for example, the L-SAR in spring in 2000 (imaging radar) flight, original data rate is 8Mbytes/s, and the L-SAR flight after improving autumn in 2000, original data rate is brought up to 16Mbytes/s.The operand of handling is very big in real time, is difficult to carry out real-time precision processing.Therefore, high capacity, high-speed, working stability, the research of the register system of remote sensor raw data have accurately just become the requisite key equipment of ground precision processing and remote sensor research.So high data transfer rate with general equipment, can't be noted, and needs to use special-purpose high-speed real-time recording unit.In the past, these magnanimity data recording is at a high speed got off will be with the very expensive specialized equipment of price, and this is the unaffordable a large number of spending of general R﹠D institution.Along with the develop rapidly of remote sensing technology, the speed of the remotely-sensed data that need gather is more and more higher, and data volume is also increasing.The difficult problem how these a large amount of original remotely-sensed datas at a high speed noted has accurately so just appearred.Though can adopt the very expensive specialized equipment of price, the data volume of record is also limited.And a data acquisition amount of present high performance remote sensor is just up to tens and even hundreds of GB.

Summary of the invention

The purpose of this invention is to provide a kind of portable high-speed data acquisition instrument simple in structure, easy to use.

For achieving the above object, high-speed real-time remotely-sensed data register comprises:

At least one high-speed PCI data collecting card gathered the high-speed data of remote sensor, and the data of gathering stored into the core buffer of computing machine special use by pci bus;

At least one PCI-SCSI interface card write the data of calculator memory buffer zone in the jumbo SCSI memory device by pci bus.

The present invention has realized the portable high-speed real-time data record device based on microcomputer, and simple in structure easy to carry, is a kind of high-speed real-time register with extensive use.

Description of drawings

Fig. 1 is a register system structural drawing of the present invention;

Fig. 2 is a pci data capture card structured flowchart;

Fig. 3 is the program flow diagram of register system of the present invention.

Embodiment

As shown in Figure 1, insert some PCI (programmable communication interface)-SCSI (attached small computer system interface) interface card on the PCI local bus, these PCI plug-in cards can design voluntarily, also can adopt suitable data capture card on the market., and then these are deposited in data in the core buffer in time write in high speed hard-disk or the magnetic tape station by several high-speed PCIs-SCSI card and make permanent storage the core buffer of the high-speed data direct access of remote sensor with a high-speed PCI high-speed data acquisition card to the special use of computing machine.

As shown in Figure 2, the data input device of register is a pci data capture card, is responsible for receiving the data from data source, and data are transferred to internal memory through pci bus.Clock signal (CLK), trigger pip (TRIG), 32bit parallel signal form the extension set input from the data of remote sensor, every clock 32bit data, and there is a trigger pip front of every frame data.The core devices of pci data capture card is the IDF-FIFO of one group of 64Kbyte and the control chip PCI9080 of a PLX technology company.In order to guarantee that data recording is correct, in the time will writing down the input data, logging program is done initial reset to the data capture card earlier and is emptied, and interrupt service routine is set.EPLD waits for trigger pip, in case trigger pip is effective, opens the input clock path, and data just can be input under the effect of clock among the FIFO of capture card, up to being initialised once more.A counter is arranged, the data volume that record enters FIFO among the EPLD.Overflow for the data that prevent FIFO, when FIFO being set will expiring counting effectively, and the trigger data acquisition card produces and interrupts and start accessing operation simultaneously, and data are passed to internal memory by FIFO.Will constantly monitor the state of FIFO in access, if the FIFO sky, data transmission sus-pension waits pending data to arrive, and the burst transfer that can influence PCI is like this renderd a service.Therefore, each access data quantity transmitted can not be too big, suitably not produced the FIFO sky and exceeded.

Because be used for storing the hard disk of data and the tracking of magnetic tape station needs the time, and the FIFO of data collecting card only has 64KB to make buffer zone, if the data on the capture card have little time to take away, FIFO will overflow.Therefore, must in internal memory, open up enough buffer zones, buffered data input and not the matching of speed of writing hard disk or magnetic tape station.Because DOS can not access extended memory, and conventional memory has only about 540KB can make buffer zone, and only after the conventional memory buffer zone is full, just utilize the level 2 buffering district.Therefore, in exented memory, open up the level 2 buffering district.

The speed of data storage device is mainly determined by the buffer memory and the rotating speed of SCSI bus transmission speed, memory device.The buffer memory size of memory device has considerable influence to transmission.Buffer memory hour, for a big data block, the I/O request number of times in the unit interval increases, and the system supplymentary expense increases; Buffer memory increases, and auxiliary expense reduces, and system transmissions speed increases.But after buffer memory capacity increased to a certain degree, the system transmissions rate variations was just little.Generally be no more than the hump speed of disk, each read-write of disk is unit with the sector, and the critical point of buffer memory should be greatly about 1.5 times of sector capacities.Tracking and wait are disk transmission speed labile factors, reduce average tracking and stand-by period by forming the dish battle array by a plurality of high rotating speed disks.

SCSI bus also has bigger influence to transmission speed.Because a scsi device will carry out data transmission, need at first to obtain bus control right by competition; At any one time, can only there be a scsi device to obtain bus control right on the SCSI bus, carries out data transmission; Add and consider priority arbitration failure etc.; To the speed that a plurality of disks on the same SCSI bus are read and write simultaneously, a plurality of disk speed of reading while write of comparing on the different SCSI bus are little.So the scheme that the present invention adopts a plurality of disks to be positioned on the different SCSI bus reduces the influence of SCSI bus to transmission speed.

Claims

1. high-speed real-time remotely-sensed data register comprises:

2. by the described data recorder of claim 1, it is characterized in that described core buffer also comprises the level 2 buffering district of expansion.

3. by the described data recorder of claim 1, it is characterized in that described high-speed PCI data collecting card comprises the IDT-FIFO and the control chip PCI9080 of one group of 64K byte.

4. by the described data recorder of claim 1, the critical point that it is characterized in that the buffer memory of described SCSI memory device is 1.5 times of sector capacity places.

5. by the described data recorder of claim 1, it is characterized in that described a plurality of memory device is positioned on the different SCSI bus.