WO2006053956A1 - Detection d’erreurs dans les donnees concernant l’actionnement d’un organe de vehicule - Google Patents
Detection d’erreurs dans les donnees concernant l’actionnement d’un organe de vehicule Download PDFInfo
- Publication number
- WO2006053956A1 WO2006053956A1 PCT/FR2005/002624 FR2005002624W WO2006053956A1 WO 2006053956 A1 WO2006053956 A1 WO 2006053956A1 FR 2005002624 W FR2005002624 W FR 2005002624W WO 2006053956 A1 WO2006053956 A1 WO 2006053956A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- data transmission
- codes
- code
- data
- transmission method
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/08—Arrangements for detecting or preventing errors in the information received by repeating transmission, e.g. Verdan system
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0078—Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location
Definitions
- the present invention relates to transmission systems, by means of digital signals, data relating to the actuation of a member for operating a vehicle. It concerns in particular the problem of the fidelity of transmission of such data in embedded systems operating in real time.
- the first electrical controls of this type were made up of analog signals, but digital signals are increasingly being used as a support for control commands.
- the actions exerted by the driver of the vehicle are translated in the form of numerical commands, which are then inserted into messages by an insertion unit; then these messages pass through one or more interconnect units until reaching one or more extraction units in which said digital commands are extracted from said message; finally, the control instructions are applied to one or more servo units (after having been, if necessary, translated into analog setpoints for the servo units that need them).
- error codes Codes to detect that errors have occurred are called "error codes”. These are the codes to which the present invention is mainly concerned, but it could also be envisaged to correct the transmission errors by using so-called “error correcting" codes. It should also be noted that certain codes make it possible to detect the presence of errors as well as to correct them.
- the ability of the code to detect, or correct, transmission errors is always limited.
- the detection, or correction, of a code increases, at k fixed, with the "redundancy" (n -k).
- the probability of non-detection corresponds to the probability that a received word r, although erroneous, is by accident equal to another code word that the transmitted word which is at the origin of this received word r ; we deduce that this probability is of the order of q ⁇ (n ⁇ k) . Therefore, conventionally, predetermined error detection reliability is achieved in a communications system numerically by adjusting the parameters q, n, and k of an error detector code according to this order of magnitude.
- a first known means for reducing the risk of such an event occurring is to double the electrical circuits so as to be able to transmit two copies of each message respectively along two separate channels.
- This technical solution obviously has the disadvantage of doubling the installation costs of these electrical circuits.
- it implies an increase in the space occupied by these circuits, and their weight, which can be very troublesome in certain areas such as avionics.
- the invention thus relates, in a first aspect, to a method of transmitting data relating to the actuation of a vehicle member, in which codewords are transmitted, along a given channel, each resulting from the coding of channel of an information symbol block representative of said data, said method being remarkable in that at least two such successive information symbol blocks are encoded by means of two different codes from each other.
- the impossibility of correctly transmitting a certain setpoint is not catastrophic, provided that the pilot (or the steering system) is informed of this impossibility early enough to be able to take appropriate back-up measures (for example, call upon an auxiliary mechanical means of another chain of electrical components than the main mechanical organ).
- the code words are all of the same length n> k, and that their k last symbols are systematically taken identical to the k information symbols, the (nk) first symbols representing the redundancy (this is an example of so-called "systematic" coding).
- "channel noise” has the effect of putting zeros in place of certain determined components of each code word transmitted by the channel.
- the error concerns the information symbols rather than the redundancy symbols
- the received words corresponding to two identical successive messages will be different since the redundancy symbols were initially different (as a whole) for these two messages.
- the error concerns the redundancy symbols rather than the information symbols, the two received words will be close to each other, or perhaps identical, but the receiver will verify the membership of each received word to a different code from the other code.
- the probability of non-detection of transmission errors affecting two successive messages is also very low when these two messages are different from one another, if one implements the method of data transmission according to the invention.
- the present invention advantageously allows, for the applications concerned, to obtain a very high level of security with a cost of implementation quite reasonable.
- the member concerned (aileron, brake, and so on) is part of an aircraft.
- two such blocks of successive information symbols are always coded by means of two codes different from each other.
- the codes used are all the same length n, in order to facilitate the sampling of the data.
- the codes used are linear codes.
- linear codes are well known in the field of telecommunications (a domain that is a priori different from that of digital controls). These codes are such that any linear combination of code words (with the coefficients taken from the alphabet) is still a code word.
- the codes used are cyclic codes.
- Cyclic codes are particular linear codes, which are such that the result of a circular permutation applied to any codeword is also a code word. Cyclic codes are known for their efficiency and low cost; they are commonly used, and coding / decoding methods implementing these codes have been integrated into commercially available (physical or software) components (such as those, for example, for telecommunications networks).
- each cyclic code is attached to a "generator polynomial". To change the code from one message to the next, just change the generator polynomial.
- the invention relates to a data transmission system relating to the actuation of a vehicle member, comprising an encoder able to apply a channel coding to blocks of information symbols representative of said data so as to forming code words intended to be transmitted along a given channel, said system being remarkable in that said encoder is able to encode two such successive blocks of information symbols by means of two different codes, one of which 'other.
- said data transmission system further comprises an error detection unit able, for each word received at the end of said given channel, to:
- the invention also aims at:
- immovable data storage means comprising computer program code instructions for performing the steps of any of the data transmission methods succinctly set forth above,
- the device shown diagrammatically in this figure has the function of transmitting, from a source 10 to a destination 100, data relating to the actuation of a vehicle member.
- This data can for example represent a setpoint, or a set portion, for driving of the vehicle.
- the source 10 translates this information into a series of symbols belonging to a certain Galois field GF (q), and transmits these symbols to a storage unit 20, which accumulates the symbols so as to form blocks containing each k information symbols representing a message.
- q Galois field GF
- each of these blocks is transmitted by the storage unit 20 to an encoder 30 which incorporates redundancy so as to construct a word belonging to a respective code. For example, it will be possible to assign a rank to each message within a series of messages, and to associate a predetermined code to each message according to its rank.
- the code words thus formed are then transmitted to a modulator 40, which associates each symbol of the code word with a modulation symbol. Then these modulation symbols are transmitted to a transmitter 50, which inserts the symbols into a transmission channel.
- This channel may for example be a wired link, but it may also be a non-wired link such as a radio link; it can also be a logical channel.
- the transmitted message arrives at a receiver 60, after being affected by a "transmission noise" which may have the effect of modifying or erasing some of the modulation symbols.
- the receiver 60 then transmits these symbols to the demodulator 70, which transforms them into symbols of GF (q).
- the symbols resulting from the transmission of the same code word are then grouped into a "received word" in an error detection unit 80.
- this error detection unit 80 checks whether each received word belongs to the respective code that was used by the encoder 30 for this respective message.
- the encoder 30 and the error detection unit 80 may be provided with the same "Table” type correspondence list. "Look Up Table” (LUT), which will allow both devices to know which code should be associated with a message according to its rank; such a look-up table can be conveniently implemented in software form or in the form of a specific logic circuit. If the error detection unit 80 finds that the received word belongs to the code respectively associated with this message, the received word is transmitted to a redundancy suppression unit 90, which extracts k information symbols by setting implement a decoding algorithm inverse to that implemented by the encoder 30. Finally, these information symbols are provided to their recipient 100.
- LUT Look Up Table
- the error detection unit 80 ascertains that the received word does not belong to the code respectively associated with this message, it triggers an alarm according to particular arrangements which the person skilled in the art will have fixed, in a known manner, depending on the intended application of the invention.
- Units 80 and 90 may be considered together to form a "decoder" 110.
- cyclic code coding / decoding with m ⁇ 2 distinct generator polynomials is successively implemented, in a repeated manner:
- this received word happens to be a word belonging to one of the m codes, it is very improbable that this received word belongs to all the m codes, so that the presence of a Transmission error will, most likely, be detected at the latest after m words received, and the repetition of errors (signaling the possibility of permanent channel failure) will, most likely, be detected at the latest after 2m words received.
- a similar "complementarity principle" will preferably be applied if another coding method is used, for example non-cyclic linear code coding using parity matrices of the same size (nk) ⁇ n, but different two by two. .
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Error Detection And Correction (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
- Time-Division Multiplex Systems (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/719,325 US8239075B2 (en) | 2004-11-16 | 2005-10-21 | Detection of errors in data relating to the actuation of a vehicle member |
CA2587503A CA2587503C (fr) | 2004-11-16 | 2005-10-21 | Detection d'erreurs dans les donnees concernant l'actionnement d'un organe de vehicule |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0412141A FR2878097B1 (fr) | 2004-11-16 | 2004-11-16 | Detection d'erreurs dans les donnees concernant l'actionnement d'un organe de vehicule |
FR0412141 | 2004-11-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006053956A1 true WO2006053956A1 (fr) | 2006-05-26 |
Family
ID=34951248
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2005/002624 WO2006053956A1 (fr) | 2004-11-16 | 2005-10-21 | Detection d’erreurs dans les donnees concernant l’actionnement d’un organe de vehicule |
Country Status (4)
Country | Link |
---|---|
US (1) | US8239075B2 (fr) |
CA (1) | CA2587503C (fr) |
FR (1) | FR2878097B1 (fr) |
WO (1) | WO2006053956A1 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3014273B1 (fr) | 2013-12-03 | 2016-01-01 | Thales Sa | Systeme de transmission de donnees applicatives avioniques |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4670880A (en) * | 1984-09-11 | 1987-06-02 | International Business Machines Corp. | Method of error detection and correction by majority |
EP0831614A2 (fr) * | 1996-09-04 | 1998-03-25 | Palomar Technologies Corporation | Transpondeur RF avec détection et correction d'erreur |
US6014411A (en) * | 1998-10-29 | 2000-01-11 | The Aerospace Corporation | Repetitive turbo coding communication method |
US6560744B1 (en) * | 1998-01-23 | 2003-05-06 | D.S.P.C. Technologies Ltd. | Method and device for detecting rate |
US6690733B1 (en) * | 1998-12-11 | 2004-02-10 | Daimlerchrysler Ag | Method for data transmission |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6292918B1 (en) * | 1998-11-05 | 2001-09-18 | Qualcomm Incorporated | Efficient iterative decoding |
DE10001395A1 (de) * | 2000-01-14 | 2001-08-02 | Infineon Technologies Ag | Codierverfahren zur Codierung von Aktoren-Steuerbefehlen und Aktorensteuereinheit zur Steuerung von Aktoren |
DE60138208D1 (de) * | 2000-10-05 | 2009-05-14 | Panasonic Corp | Digitaler datensender |
DE10250920B4 (de) * | 2002-10-31 | 2005-05-04 | Siemens Ag | Ausgabeeinheit, Empfangseinheit, Anordnung zur Datenübertragung in einem Kraftfahrzeug sowie Verfahren dazu |
CA2465332C (fr) * | 2003-05-05 | 2012-12-04 | Ron Kerr | Decodage de donnees d'entree temporaires pour codes lineaires |
-
2004
- 2004-11-16 FR FR0412141A patent/FR2878097B1/fr active Active
-
2005
- 2005-10-21 CA CA2587503A patent/CA2587503C/fr active Active
- 2005-10-21 WO PCT/FR2005/002624 patent/WO2006053956A1/fr active Application Filing
- 2005-10-21 US US11/719,325 patent/US8239075B2/en active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4670880A (en) * | 1984-09-11 | 1987-06-02 | International Business Machines Corp. | Method of error detection and correction by majority |
EP0831614A2 (fr) * | 1996-09-04 | 1998-03-25 | Palomar Technologies Corporation | Transpondeur RF avec détection et correction d'erreur |
US6560744B1 (en) * | 1998-01-23 | 2003-05-06 | D.S.P.C. Technologies Ltd. | Method and device for detecting rate |
US6014411A (en) * | 1998-10-29 | 2000-01-11 | The Aerospace Corporation | Repetitive turbo coding communication method |
US6690733B1 (en) * | 1998-12-11 | 2004-02-10 | Daimlerchrysler Ag | Method for data transmission |
Also Published As
Publication number | Publication date |
---|---|
FR2878097A1 (fr) | 2006-05-19 |
US20090319122A1 (en) | 2009-12-24 |
FR2878097B1 (fr) | 2007-02-16 |
CA2587503A1 (fr) | 2006-05-26 |
CA2587503C (fr) | 2014-12-16 |
US8239075B2 (en) | 2012-08-07 |
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