CN105427406B - Aeronautical data recording equipment - Google Patents
Aeronautical data recording equipment Download PDFInfo
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- CN105427406B CN105427406B CN201510860504.5A CN201510860504A CN105427406B CN 105427406 B CN105427406 B CN 105427406B CN 201510860504 A CN201510860504 A CN 201510860504A CN 105427406 B CN105427406 B CN 105427406B
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C5/00—Registering or indicating the working of vehicles
- G07C5/08—Registering or indicating performance data other than driving, working, idle, or waiting time, with or without registering driving, working, idle or waiting time
- G07C5/0841—Registering performance data
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Abstract
The present invention proposes a kind of aeronautical data recording equipment, including：NAND FLASH modules；First level shifting circuit；Second electrical level conversion circuit；3rd level shifting circuit；Processing module carries out two-way communication with the first level shifting circuit, second electrical level conversion circuit, the 3rd level shifting circuit and NAND FLASH modules, for receiving the setting data after level conversion and communication data, data and communication data will be set to be transferred in a manner of direct memory access DMA in memory, the alternating for realizing data using ping-pong buffer mode stores, and data is completely written in NAND FLASH modules；Host computer communicates with processing module, for setting the running parameter of processing module.The present invention has the characteristics that high speed data transfer, high reliability and anti-interference.
Description
Technical field
The present invention relates to aeronautical data storage and recording technique field, more particularly to a kind of aeronautical data recording equipment.
Background technology
At abroad, from age Mo in last century, first on military aspect solid state data recorder research and development to today, with
The continuous development of multinomial technology, the solution for the problems such as storage chip logic-controlled sequential is complicated and read or write speed is slow, and
The advantages that data are able to preservation, the high and low power consumption of integration degree and reasonable price is stored after power-off and also promotes it in multiple fields
Applied.
The use of storage medium includes static memory, dynamic memory and memory etc., its application field is also continuous
Extension, has progressively been developed into civil field from military application, and in weapon system, unmanned plane, satellite, aviation, boat
My god, deep-sea detecting etc. also have many applications.In addition, some recorder products under special, adverse circumstances requirement
Continuously emerge.
The defects of existing aerospace applications recorder product technology, is as follows：
1st, traditional SD card facility environment characteristic deficiency, reliability are inadequate.
2nd, FLASH device also has ease for use insufficient, and complex management, speed is inadequate, and there are the defects of invalid bad block.
3rd, system needs to solve the sequential and logical problem of high-speed memory state.
4th, system needs to solve gathered data reliability integrity issue.
5th, FLASH media need to solve the problems, such as to repeat to power on and be filled with.
6th, Interface design problem, including reliability, high speed performance etc. are read.
7th, the interference free performance of the extreme environment such as airborne.
8th, system global reliability design requirement, including anti shock and vibration, high/low temperature etc..
9th, the applicability such as system weight, volume, waterproof requirement.
The content of the invention
The purpose of the present invention is intended at least solve one of described technological deficiency.
For this reason, it is an object of the invention to propose a kind of aeronautical data recording equipment, there is high speed data transfer, highly reliable
The characteristics of property and anti-interference.
To achieve these goals, the embodiment of one aspect of the present invention provides a kind of aeronautical data recording equipment, including：
NAND-FLASH modules；First level shifting circuit, first level shifting circuit are described detecting with setting mouth to be connected
When setting mouth has setting data input, level conversion is carried out to the setting data；Second electrical level conversion circuit, the second electrical level
Conversion circuit is connected with the first communication port, when detecting that first communication port has communication data input, to the communication data
Carry out level conversion；3rd level shifting circuit, the 3rd level shifting circuit is connected with the second communication port, detecting
When stating the second communication port has communication data input, level conversion is carried out to the communication data；Processing module, the processing module with
First level shifting circuit, second electrical level conversion circuit, the 3rd level shifting circuit and the NAND-FLASH modules into
Row two-way communication, for receiving the setting data after level conversion and communication data, by the setting data and communication data with
The mode of direct memory access DMA is transferred in memory, and the alternating for realizing data using ping-pong buffer mode stores, and data are complete
Whole is written in the NAND-FLASH modules；Logical record area is opened in processing module, sector is carried out using note
Record；The address information of NAND-FLASH moulds invalid block in the block is detected and real-time update is stored to invalid to avoid data
In block, then automatically into sequential operation is write, write since specified storage location, until completing the storage of total data；On
Position machine, the host computer communicates with the processing module, for setting the running parameter of the processing module.
Further, the host computer sets the running parameter of the processing module, including：Communication port baud rate and time.
Further, the processing module uses arm processor.
Further, the aeronautical data recording equipment of the embodiment of the present invention, further includes：External memory equipment, the outside are deposited
Storage equipment is connected with the processing module, for reading the setting data and communication data.
Further, the External memory equipment is USB device or SD card.
Further, the address information of the NAND-FLASH moulds invalid block in the block is detected and real-time update is to keep away
Exempt from data storage into above-mentioned invalid block, then automatically into sequential operation is write, write since specified storage location, until complete
Into the storage of total data.
Further, the aeronautical data recording equipment of the embodiment of the present invention, further includes：Housing, the NAND-FLASH modules,
First level shifting circuit, second electrical level conversion circuit, the 3rd level shifting circuit and processing module are respectively positioned in the housing.
Further, the housing is made of high intensity aviation aluminium.
Aeronautical data recording equipment according to embodiments of the present invention, is stored using NAND-FLASH, has high-speed read-write work(
Can, and with repeating memory mechanism and repeat power-up design, it is contemplated that airborne, missile-borne environment is using more, in design and former
In material type selecting and structure design, under conditions of reliability is met, weight has been reduced to minimum.The present invention carries out capacity
Expand on demand, memory capacity can accomplish 2-128G etc., meet the water proof and dust proof requirement of IP65 ranks, it is possible to achieve high-speed data
Collection and full speed USB are read.In addition, the present invention uses USB device, there is plug and play and high ease for use.The present invention
It can realize and storage state be monitored in real time and abnormality detection, reliability is high.And it can realize double storage backups, ensure data ten thousand
None loses, and realizes dual input function, meets client's different demands.
The additional aspect of the present invention and advantage will be set forth in part in the description, and will partly become from the following description
Obtain substantially, or recognized by the practice of the present invention.
Brief description of the drawings
The above-mentioned and/or additional aspect and advantage of the present invention will become in the description from combination accompanying drawings below to embodiment
Substantially and it is readily appreciated that, wherein：
Fig. 1 is the structure chart according to the aeronautical data recording equipment of one embodiment of the invention；
Fig. 2 is the structure chart according to the aeronautical data recording equipment of another embodiment of the present invention.
Embodiment
The embodiment of the present invention is described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or has the function of same or like element.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and is not considered as limiting the invention.
As shown in Figure 1, the aeronautical data recording equipment of the embodiment of the present invention, including：The electricity of NAND-FLASH modules 1, first
Flat conversion circuit 2, second electrical level conversion circuit 3, the 3rd level shifting circuit 4, processing module 5 and host computer 6.
Specifically, the first level shifting circuit 2 is with setting mouth to be connected, when detecting that setting mouth to have sets data to input,
Level conversion is carried out to the setting data.
Second electrical level conversion circuit 3 is connected with the first communication port, when detecting that the first communication port has communication data input,
Level conversion is carried out to the communication data.
3rd level shifting circuit 4 is connected with the second communication port, when detecting that the second communication port has communication data input,
Level conversion is carried out to the communication data.
5 and first level shifting circuit 2 of processing module, second electrical level conversion circuit 3, the 3rd level shifting circuit 4 and
NAND-FLASH modules 1 carry out two-way communication, for receiving the setting data after level conversion and communication data, wherein, processing
Module 5 can realize the reception and storage to double-serial port data volume, and baud rate is up to 460800bps-921600bps, communication
Mode is RS232 or RS422 signals, can guarantee that no data byte loss.
Specifically, processing module 5 will set data and communication data to be transferred to memory in a manner of direct memory access DMA
In, the alternating for realizing data using ping-pong buffer mode stores, and data are completely written in NAND-FLASH modules 1.
The performance of NAND-FLASH modules 1 is illustrated below.
Aerospace Engineering application in need gather mass data, by ground receiver station quantity, distribution, transmission rate or
The limitation of data trunking availability, has the ability of high-speed high capacity data record in many application requirements aircraft.Solid-state is remembered
Device is recorded using semiconductor memory chip as storage medium, no mechanical moving element, strong environmental adaptability, thus be increasingly becoming winged
The mainstream scheme of data record on row device.
NANDFLASH is as a kind of emerging semiconductor storage unit, the non-volatile memories energy with high capacity density
Power, small power consumption, cost are low, long lifespan and the features such as anti-vibration, are the optimal selections of severe rugged environment storage medium.
The write-in programming mode of Flash usually has two kinds：Programming mode is write by byte and writes programming mode by sector.
According to the principle that chip writes the difference of programming mode, high speed writein circuit is slightly different.
, being continuously written into Flash by the mentality of designing of the high speed writein circuit of the Flash devices of byte write-in programming
Speed improves 2n times.
For the flash storage by sector write-in programming mode, the storage of the chip by chip address of Flash in each area
The bus address of unit is continuous by sector, and adjacent sectors bus address is then discontinuous in piece, and the method can be by the continuous of Flash
Writing speed improves 2k × 2n times.
NAND-FLASH modules 1, which are operated, mainly to be included：The detection of invalid block information list and dynamic update, the number of storage
According to write, read and wipe etc..
Memory rate can be lowered significantly by establishing file system due to the storage of NAND-FLASH modules 1, and be reduced overall reliable
Property, but the problem of secondary power-up covers can occur without file system.During practical flight, since environment is complicated, Duo Zhongte
Different reason may result in the problem of system repeats to power on triggering, at this time it is possible that the data of previously collection storage are secondary
The consequence of data portion covering after the power is turned on.
To solve the above problems, the present invention can solve the problems, such as this using the method that memory block is carried out to logic record.
By opening logical record area in processing module 5, usage record is carried out to sector, the system that can realize repeatedly powers on, simultaneously
Data acquisition storage can accurately be carried out.After can ensureing that storage medium is filled with the same time, cycle index, the relatively early fan of intelligence erasing are carried out
Area, has no effect on this storage experiment process.
Invalid block occurs in NAND-FLASH modules 1 in use.Invalid block refer in a block there are one or
Multiple invalid bits, this is the inherent characteristic of such storage chip, and can be in continually changing during subsequent use
State, its reliability cannot be guaranteed, it is necessary to label, bypass and carry out data backup.In order to ensure to gather and receive
To data can accurately and safely be stored, it is necessary to establish to defect block addresses information list storage chip into Mobile state
Renewal and the mechanism of management.
Specifically, the address information of the invalid block in NAND-FLASH modules 1 is detected with real-time update to avoid number
According to storage into above-mentioned invalid block, then automatically into sequential operation is write, write since specified storage location, until completing complete
The storage of portion's data.
For the whole work schedule of system, the defect block addresses that are obtained first during each initialization and use
Information is stored in these special storage regions, and when the storage and reading of data is carried out, first invalid block address is believed
Breath list is read out, it is achieved thereby that the dynamic real-time update of invalid block address information so that the write-in of whole data, read
Operating process avoids above-mentioned invalid block, improves the accuracy and reliability of reading and writing data.Then automatically into writing sequential operation, from
The storage location specified starts to write, until the storage of whole data is completed.
In one embodiment of the invention, processing module 5 can use arm processor.Such as：Model
The arm processor of STM32VET6.
The data processing of arm processor has the features such as real-time, high-speed, because initial data is in core buffer
It is periodic refresh, and the write-in storage of data needs to consume the regular hour.If handle not in time, not only cannot be real
Store function is monitored when real, and loss of data can be caused, seriously affects system worked well.Therefore, it is necessary to using certain
Method solve data acquisition, the contradiction being received and stored in sequential and conflict.
The present invention uses the height that DMA transfer and Pingpang Memory mode are data between peripheral hardware and memory, memory and memory
Speed transmission provides a kind of solution route and method well.Mode is received for serial data, employs the side of DMA interruptions
Formula, it is possible to achieve the quick transmission of data, can ensure that intactly serial data carries out reception storage.
Arm processor monitoring sets mouth, the first and second communication ports, as serial ports has data input, then passed by dma mode
In the defeated A to correspondence memory, treat that memory A expires, DMA automatically switches to store is written to NAND- into memory B, while memory A data
In FLASH modules 1, so alternately.
The alternating for realizing data using ping-pong buffer mode stores, and data are completely written to NAND-FLASH modules 1
In, the storage to the processing of data leaves the enough time, so that greatly reduce in data acquisition and storing process,
The probability of data frame losing occurs, it is possible to achieve effectively store data at a high speed.
Host computer 6 communicates with processing module 5, for setting the running parameter of processing module 5.At one of the present invention
In embodiment, running parameter can include：Communication port baud rate and time.For example, communication port Configuration of baud rate is
460800bps-921600bps。
Further, as shown in Fig. 2, the aeronautical data recording equipment of the embodiment of the present invention further includes：External memory equipment 7.
The External memory equipment 7 is connected with processing module 5, and data and communication data are set for reading.
Preferably, External memory equipment 7 can be USB device or SD card.
The present invention is after the data acquisition storage during completing whole flight test, when carrying out ground recycling, need by
Data in processing module 5 carry out retaking of a year or grade, processing and analysis.
Be normally applied in occasion, the coffrets of data using etc. serial communication interface it is in the majority, it is contemplated that passed in data
It can be influenced during defeated be subject to electromagnetic interference, noise, power consumption and the requirement of data transmission bauds, transmission range etc., these
Interface often can not meet actual application requirement.
The present invention, as the coffret between processing module 5 and host computer 6, is stored using usb mode with realizing
Reliable, the quick transmission of data.USB interface has the function of that its is powerful, oneself obtains quite varied application in practice, it has
There are standard unification, plug and play, easy to carry, transmission speed is high, scalability is strong and cheap.
Meanwhile we have carried out USB port full speed USB designs, and optimize and edit the USB for meeting pc port drivings,
It is only the maximum rate digital independent for meeting full speed USB.
The present invention devises two kinds of data reading modes:
(1) field USB flash disk is read, and meets the digital independent of severe wild environment experiment.After USB flash disk is inserted into, system can be voluntarily
Judge, and carry out the copy of data, judge to be transmitted situation by indicator light.
(2) the USB read operations of conventional personal computer PC, we provide special-purpose software, carry out the complex management of data.
In addition, the present invention has carried out USB port independent power-up design, it can rely on PC's in the case of no external power supply
USB port is powered, and is completed the digital independent of system, or even data storage function, is truly realized plug and play.
Further, the aeronautical data recording equipment of the embodiment of the present invention further includes：Housing, wherein, NAND-FLASH modules
1st, the first level shifting circuit 2, second electrical level conversion circuit 3, the 3rd level shifting circuit 4 and processing module 5 are respectively positioned on housing
It is interior.
In one embodiment of the invention, housing is made of high intensity aviation aluminium.
The course of work of the aeronautical data recording equipment of the present invention is illustrated below：
System electrification initializes, and first passes through host computer 6 and sets the parameters such as the corresponding communication port baud rate of processing module 5, time,
Processing module 5 monitors communication port and sets mouth.If data input, processing module 5 is transferred to correspondence memory by dma mode
In, the alternating for then realizing data using ping-pong buffer mode stores, and data are completely written to storage medium.Record is completed
Afterwards, host computer USB interface is inserted into, record data are read, to carry out test data analyzer and processing.
, in actual use, be with flight measurement system since the processing module of design is used primarily in flight measurement system
Make a flight test together.During this, whole system can be in judder state, along with internal other electronics are set
Standby, residing electromagnetic environment is more severe.To realize good system performance and reaching expected index request, it is necessary to system
Reliability carry out special consideration and design.
The present invention takes in from the following aspects when design, to improve the performance of system and its reliability：
(1) Power Management Design：The power input of the present invention inputs for Width funtion 8-35V, has fine adaptability.For voltage
The larger power supply of ripple, the decoupling capacitance that large capacitance is connected between power supply and ground wire are filtered.For integrated circuit
Chip, is generally all filtered by connecting decoupling capacitance between power supply and ground.
(2) system earth：Grounding is carried out for the correlation function pin do not used temporarily, avoids vacant state pair
Other pins produce larger interference, influence the normal function of system.Separated with the earth by bulky capacitor and resistance power supply signal.
(3) will simulate, digital components' placement in special different region, since analog device is easily disturbed, to the greatest extent may be used
Can be placed on single plate, though and digital device to disturb it is very insensitive, its own is very big interference source, can
It is placed on circuit board close to the position of connector.When component is placed, by analog device and digital device phase
To being disposed vertically.Will be near connector for the device of high frequency, particularly digital device.
(4) ground plane of large area is at least left in circuit.
(5) wiring distance of crystal oscillation clock circuit and the input end of clock of processing module is reduced.
(6) to the line width overstriking of power and ground, various devices should be bypassed suitably, the position of shunt capacitance should
Close proximity to the energization pins of device.
(7) on the premise of plank area allows, the spacing between cabling is increased as far as possible, enters digital section in analog signal
Before parallel circuit, appropriate filtering and conditioning processing are carried out to it.
Special application environment condition according to the present invention, high reliability request is proposed to its structure design.Using
Cheng Zhong, system can integrally be in high vibration, large impact and high overload state, and be likely to be at high-altitude low temperature environment.If do not adopt
If taking some necessary measures, data memory module will certainly be had an impact, so that cause the loss of collection storage data,
Cause catastrophic consequence.So the present invention takes whole system necessary safeguard procedures, and to the structure of whole system into
Capable reliable and security design protection.
Correlation function is reliably achieved for make system, its anti-HI high impact and high overload are ensured using following method
Used with low temperature environment：
(1) housing uses high intensity aviation aluminium, is verified by test of many times, its intensity disclosure satisfy that airborne requirement.
(2) in the design of PCB, using the components selection of wide temperature, high reliability and anti shock and vibration, and take into full account
Welding procedure, after the completion of consolidation process one by one is carried out to PCB Primary Components.
(3) in the structure design of system, shock-absorbing elastic material is installed additional between PCB and housing, while install in system
When, install shock-absorbing foot pad additional, further improve the ability of system anti high overload and large impact.
(4) under necessary extreme environment, as used on bullet, itself and exterior machine can be made to system using overall encapsulation technology
Tool design of part becomes an entirety.
Aeronautical data recording equipment according to embodiments of the present invention, is stored using NAND-FLASH, has high-speed read-write work(
Can, and with repeating memory mechanism and repeat power-up design, it is contemplated that airborne, missile-borne environment is using more, in design and former
In material type selecting and structure design, under conditions of reliability is met, weight has been reduced to minimum.The present invention carries out capacity
Expand on demand, memory capacity can accomplish 2-128G etc., meet the water proof and dust proof requirement of IP65 ranks, it is possible to achieve high-speed data
Collection and full speed USB are read.In addition, the present invention uses USB device, there is plug and play and high ease for use.The present invention
It can realize and storage state be monitored in real time and abnormality detection, reliability is high.And it can realize double storage backups, ensure data ten thousand
None loses, and realizes dual input function, meets client's different demands.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or the spy for combining the embodiment or example description
Point is contained at least one embodiment of the present invention or example.In the present specification, schematic expression of the above terms is not
Necessarily refer to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be any
One or more embodiments or example in combine in an appropriate manner.
Although the embodiment of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is impossible to limitation of the present invention is interpreted as, those of ordinary skill in the art are not departing from the principle of the present invention and objective
In the case of above-described embodiment can be changed within the scope of the invention, change, replace and modification.The scope of the present invention
Extremely equally limited by appended claims.
Claims (7)
- A kind of 1. aeronautical data recording equipment, it is characterised in that including：NAND-FLASH modules；First level shifting circuit, first level shifting circuit with set mouth be connected, detect it is described setting mouth set When putting data input, level conversion is carried out to the setting data；Second electrical level conversion circuit, the second electrical level conversion circuit are connected with the first communication port, are detecting that described first is logical When news mouth has communication data input, level conversion is carried out to the communication data；3rd level shifting circuit, the 3rd level shifting circuit are connected with the second communication port, are detecting that described second is logical When news mouth has communication data input, level conversion is carried out to the communication data；Processing module, the processing module and first level shifting circuit, second electrical level conversion circuit, the 3rd level conversion Circuit and the NAND-FLASH modules carry out two-way communication, for receiving the setting data after level conversion and communication data, The setting data and communication data are transferred in memory in a manner of direct memory access DMA, using ping-pong buffer mode Realize the alternating storage of data, data are completely written in the NAND-FLASH modules；Opened in processing module Logical record area, usage record is carried out to sector；The address information of NAND-FLASH moulds invalid block in the block is detected and Real-time update is stored into invalid block to avoid data, then automatically into writing sequential operation, since specified storage location Write, until completing the storage of total data；Host computer, the host computer communicate with the processing module, for setting the running parameter of the processing module.
- 2. aeronautical data recording equipment as claimed in claim 1, it is characterised in that the host computer sets the processing module Running parameter, including：Communication port baud rate and time.
- 3. aeronautical data recording equipment as claimed in claim 1, it is characterised in that the processing module uses arm processor.
- 4. aeronautical data recording equipment as claimed in claim 1, it is characterised in that further include：External memory equipment, it is described outer Portion's storage device is connected with the processing module, for reading the setting data and communication data.
- 5. aeronautical data recording equipment as claimed in claim 4, it is characterised in that the External memory equipment is USB device Or SD card.
- 6. aeronautical data recording equipment as claimed in claim 1, it is characterised in that further include：Housing, the NAND-FLASH Module, the first level shifting circuit, second electrical level conversion circuit, the 3rd level shifting circuit and processing module are respectively positioned on the shell In vivo.
- 7. aeronautical data recording equipment as claimed in claim 6, it is characterised in that the housing uses high intensity aviation aluminum Into.
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| CN201510860504.5A CN105427406B (en) | 2015-12-02 | 2015-12-02 | Aeronautical data recording equipment |
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| CN201510860504.5A CN105427406B (en) | 2015-12-02 | 2015-12-02 | Aeronautical data recording equipment |
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| CN105427406B true CN105427406B (en) | 2018-04-17 |
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| CN108109224B (en) * | 2016-11-24 | 2021-03-26 | 陕西航空电气有限责任公司 | Data recording module suitable for aviation electrical power generating system controller |
| CN115297094B (en) * | 2022-10-08 | 2023-02-28 | 苏州浪潮智能科技有限公司 | Video transmission control method, device, equipment and computer readable storage medium |
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| CN102169462A (en) * | 2011-04-27 | 2011-08-31 | 中国科学院光电技术研究所 | NAND Flash-based data recording method and recording controller |
| CN103279081A (en) * | 2013-05-02 | 2013-09-04 | 广州航新航空科技股份有限公司 | Aeronautic health control system |
| CN103440211A (en) * | 2013-07-28 | 2013-12-11 | 浙江大学 | Unmanned aerial vehicle flight data recorder and power failure detection and RAM (Random Access Memory) data protection method |
| CN204242259U (en) * | 2014-11-24 | 2015-04-01 | 成都中远信电子科技有限公司 | A kind of datalogger for aviation |
| CN204740640U (en) * | 2015-07-16 | 2015-11-04 | 湖北三江航天红林探控有限公司 | Aircraft data record device based on SD card |
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2015
- 2015-12-02 CN CN201510860504.5A patent/CN105427406B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102169462A (en) * | 2011-04-27 | 2011-08-31 | 中国科学院光电技术研究所 | NAND Flash-based data recording method and recording controller |
| CN103279081A (en) * | 2013-05-02 | 2013-09-04 | 广州航新航空科技股份有限公司 | Aeronautic health control system |
| CN103440211A (en) * | 2013-07-28 | 2013-12-11 | 浙江大学 | Unmanned aerial vehicle flight data recorder and power failure detection and RAM (Random Access Memory) data protection method |
| CN204242259U (en) * | 2014-11-24 | 2015-04-01 | 成都中远信电子科技有限公司 | A kind of datalogger for aviation |
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