WO2014065643A1 - Procédé pour gérer un dispositif radio défini par logiciel installé sur un petit satellite - Google Patents

Procédé pour gérer un dispositif radio défini par logiciel installé sur un petit satellite Download PDF

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Publication number
WO2014065643A1
WO2014065643A1 PCT/LV2012/000017 LV2012000017W WO2014065643A1 WO 2014065643 A1 WO2014065643 A1 WO 2014065643A1 LV 2012000017 W LV2012000017 W LV 2012000017W WO 2014065643 A1 WO2014065643 A1 WO 2014065643A1
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WO
WIPO (PCT)
Prior art keywords
payload
software defined
radio device
defined radio
messages
Prior art date
Application number
PCT/LV2012/000017
Other languages
English (en)
Inventor
Kaspars KONDRATJEVS
Original Assignee
Ventspils Augstskola
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ventspils Augstskola filed Critical Ventspils Augstskola
Priority to PCT/LV2012/000017 priority Critical patent/WO2014065643A1/fr
Publication of WO2014065643A1 publication Critical patent/WO2014065643A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/34—Network arrangements or protocols for supporting network services or applications involving the movement of software or configuration parameters 
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/04—Protocols for data compression, e.g. ROHC
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/50—Service provisioning or reconfiguring

Definitions

  • the present invention relates to a method for managing software defined radio device installed on a small satellite by a high latency unreliable communication channel and may be used for universal signal reception and transmission applications based on a software defined radio device hardware.
  • Different public protocol implementations still exist such as the AX.25 data link layer protocol or the Satellite Transport Protocol, but they are not applicable in mixed communication channel environments as they directly rely on the Physical Layer and a low latency communication channel.
  • the common communication protocols and methods are derived from a specialized transmission hardware dedicated to certain small satellite tasks in scenarios where a modular small satellite design is desirable, the implementation of these communication protocols and hardware is an expensive trade-off. Programming the common satellite software defined radio devices is done initially for a selected field of application and the program is modified during the operation of an application to suit minimal corrections for the transmission and reception environmental factors.
  • US 2011/0007849 A1 discloses a software defined radio device that detects incoming signals and resolves whether they are ORBCOMM or AIS signals and transmits the data to a ground station.
  • this solution cannot be used directly with communication channels of different types and in cases of high latency channels.
  • the object of the invention is to provide a method for managing a software defined radio device installed on a small satellite by a high latency communication channel.
  • the object of the invention is achieved in a method for managing a software defined radio device installed on a small satellite by a high latency communication channel comprising the steps of: a) preparing a payload on a ground station;
  • the simple symbol set consists of text symbols.
  • the simple symbol set is an ASCII subset.
  • the benefits of using this ASCII subset is a greater compatibility with the majority of small satellite commercial modem internal symbol sets.
  • the method further comprises a step of transmitting the reception confirmation from the software defined radio device to the ground station.
  • the method further comprises a step of checking the reception confirmation and re-transmitting the individual messages for which the reception confirmation was not received.
  • the method comprises a step of preparing and transmitting a payload from the software defined radio device to the ground station.
  • the payload transmitted from the software defined radio device comprises a result of the execution control description processing.
  • Fig. shows payload delivery paths to a software defined radio device on a small satellite.
  • the present method for managing a software defined radio device installed on a small satellite by a high latency communication channel is further described by means of the following example.
  • Compressed data to be delivered to a software defined radio device on a small satellite for processing and queuing, extraction and execution is called a payload.
  • the operations of processing and queuing, extraction and execution are performed by the software defined radio device on the satellite 3.
  • the payload is prepared using software of the ground station 1 and contains executables, software defined radio device programming modules, scripts and an execution control description which defines the execution time and sequence of processes.
  • the payload consists of the flowing components:
  • software defined radio device programming data software defined radio device hardware programming and initialization instructions for application specific signal processing; it contains a file with logical block definitions for signal processing procedures;
  • executables precompiled helper applications which are designed for the software defined radio devices embedded processing system and are not included in the base system and are used for software defined radio device applications pre-processing, processing and post-processing tasks or other tasks;
  • scripts scripted programs which are used by an interpreter on the software defined radio devices processing system to perform different tasks such as data structuring, data preparation, result processing and other functions
  • control description the payload has to contain control descriptions which provide processing information to the systems for the further software defined radio device application steps. The control descriptions define the contents of the payload, their execution process, result processing, result delivery to the ground station and all time related control, in particular, maximal execution duration;
  • the payload is prepared using the ground station control software; the user adds all payload files and defines and adds an execution control description to the payload. After the payload is defined, a unique identifier is assigned to it and it is compressed and split into transmittable messages.
  • the payload is compressed to reduce its transmission size by using the standard gzip deflate algorithm or an alternative compression algorithm.
  • Every compressed payload is encoded using a simple symbol set (e.g., Base64) encoding scheme.
  • a simple symbol set e.g., Base64
  • the encoded payload is split into smaller individual messages (e.g., 200 bytes in size for the compatibility with the ORBCOMM communication links 4, the size of said messages depending on the transmissions systems used) which are supplemented with an additional control description.
  • a message is the result of payload preparation for transmission. Every individual message contains an ending symbol (e.g., "$") which is not contained in the simple symbol set used for payload encoding (e.g., Base64) and assures the detection of the message end. Every message contains a header of simple symbols set symbols (e.g., Base64) separated with a separation symbol (e.g., "!).
  • JZ - payload's ID is generated randomly from the symbols a-z, A-Z, 0-9. To make the ID unique and collision-safe, the payload ID is combined with the total message number the payload contains;
  • PCFET Base64 encoded payload data; 1 - the number of the current message;
  • the checksum is calculated from the whole message except for the last three bytes which are the separator and the checksum itself.
  • the checksum calculation is done using MD5 or an alternative algorithm (in this example the result is reduced to two bytes).
  • the software defined radio device receives the message, checks the checksum - if the checksum does not match the message, it is discarded. The number of the checksum bytes is selected so as to optimize the used transmission system (ORBCOMM in this case).
  • Payload delivery control messages are prepared.
  • the symbol used to specify the type of the message is given as an example and can vary:
  • M - the message contains payload data;
  • Mtime:5 - sets the retransmission timeout (to 5 seconds in this example). The timeout starts after the last message is received. If no message is received after the timeout, the software defined radio device software sends a request to the ground station for the message retransmission;
  • Ctime:8 - sets the global payload time to live timeout (8 seconds in this example). This timeout starts after the last payload message is received. If no message is received till the end of this timeout, the payload is discarded and no other retransmission requests occur;
  • this message is larger than specified maximum message size (e.g., 200 bytes), it is resent multiple times specifying the remaining missing messages.
  • specified maximum message size e.g. 200 bytes
  • F - The software defined radio software sends this message, if the payload is successfully delivered, so the ground station can free up allocated transmission resources. This message is retransmitted periodically until a confirmation message (message type A) is received from the ground station. If the sender receives the F message, but this payload is not in the list, then nevertheless it sends the A message as it is possible that the earlier A message has been lost.
  • a confirmation message messages type A
  • a - confirmation message is sent if the F message is received
  • the payload delivery paths 2, 5 can be accomplished using different communication channels: direct radio communication to the satellite 6 or commercial channel providers 7 such as ORBCOMM or IRIDIUM using inter-satellite communication channels.
  • the first step of communication is the transmission of the configuration message after which the messages are transmitted. If the ground station receives a configuration message, it does not set the configuration parameters (in a scenario when the software defined radio device sends the results back to the ground station). If the software defined radio device receives a configuration message, it sets its parameters. The ground station loads the payload into the systems operating memory (RAM); the software defined radio device stores the payload and its parts (messages) on its file system to prevent memory exhaustion, if multiple concurrent payloads are processed in parallel.
  • RAM systems operating memory
  • the ground station After the ground station has transmitted the messages, it waits for the F message or the retransmission request message. After the F message is received, the payload is released from the memory.
  • the payload messages can be received in any order.
  • the received messages are written into a file. If some messages are missing, an offset is placed depending on the number of messages missing. Later, if the missed messages are received, the offset is replaced with the corresponding message. As soon as all messages are received, the payload is decoded and the F message is transmitted.
  • the ground station decompresses the payload.
  • the software defined radio device decompresses the payload and starts parsing and executing the control description file (e.g., "commands.xml". After the application is accomplished, the results are compressed and returned to the ground station in the same manner.)
  • the control description file e.g., "commands.xml”.
  • the software defined radio device When the software defined radio device receives all messages, the message block is decoded and the payload is extracted. The data is organized into a folder with a full unique ID of the payload.
  • the software defined radio device software searches for the execution control description (in this example, an XML file: "commands.xml").
  • the execution control description XML file is parsed and executed.
  • the execution control description XML file contains an interval identifier; this is the global timeout for execution when no successful execution and delivery of results has happened; the software terminates the software defined radio application for this payload (failure) and the payload is deleted.
  • the execution results are stored into an XML file with post-processed or raw data.
  • the present invention provides a method for managing a software defined radio device installed on a small satellite by a high latency communication channel.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Relay Systems (AREA)

Abstract

L'invention concerne un procédé pour gérer un dispositif radio défini par logiciel installé sur un petit satellite par un canal de communication à latence élevée, comprenant les étapes consistant à : préparer des données utiles sur une station terrestre; ajouter une description de commande d'exécution aux données utiles; compresser les données utiles; coder les données utiles compressées à l'aide d'un ensemble de symboles simples; diviser les données utiles codées en un ensemble de messages individuels; ajouter des codes de transmission à chacun des messages individuels à l'aide de l'ensemble de symboles simples; préparer des messages de commande de distribution de données utiles; transmettre les messages individuels et les messages de commande de la station terrestre au dispositif radio défini par logiciel; recevoir les messages individuels et les messages de commande par le dispositif radio défini par logiciel; vérifier les messages individuels reçus à l'aide des messages de commande; combiner des messages individuels en données utiles codées, décoder les données utiles et extraire la description de commande d'exécution; modifier le dispositif radio défini par logiciel selon la description de commande d'exécution.
PCT/LV2012/000017 2012-10-25 2012-10-25 Procédé pour gérer un dispositif radio défini par logiciel installé sur un petit satellite WO2014065643A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/LV2012/000017 WO2014065643A1 (fr) 2012-10-25 2012-10-25 Procédé pour gérer un dispositif radio défini par logiciel installé sur un petit satellite

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/LV2012/000017 WO2014065643A1 (fr) 2012-10-25 2012-10-25 Procédé pour gérer un dispositif radio défini par logiciel installé sur un petit satellite

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WO2014065643A1 true WO2014065643A1 (fr) 2014-05-01

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110224745A (zh) * 2019-06-25 2019-09-10 哈尔滨工业大学 一种卫星宽带数据上注系统及方法
CN112799700A (zh) * 2021-01-28 2021-05-14 西安电子科技大学 一种卫星地面控制系统及方法
US11239905B2 (en) * 2016-07-28 2022-02-01 Spire Global Subsidiary, Inc. Systems and methods for command and control of satellite constellations

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5995518A (en) * 1997-05-01 1999-11-30 Hughes Electronics Corporation System and method for communication of information using channels of different latency
US20070288553A1 (en) * 2004-06-24 2007-12-13 Freestyle Technology Pty Ltd. Client Processor Device
US20080207120A1 (en) * 2005-06-29 2008-08-28 Anna Kurina Wireless Data Transmission Methods, Devices, and Systems
US20100146590A1 (en) * 2007-05-09 2010-06-10 Wellbia.Com Co., Ltd. System and method for security using one-time execution code
US20120036239A1 (en) * 2004-09-10 2012-02-09 Freestyle Technology Pty Ltd Client processor device for building application files from file fragments for different versions of an application
US20120215831A1 (en) * 2011-02-22 2012-08-23 Julian Michael Urbach Software Application Delivery and Launching System

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5995518A (en) * 1997-05-01 1999-11-30 Hughes Electronics Corporation System and method for communication of information using channels of different latency
US20070288553A1 (en) * 2004-06-24 2007-12-13 Freestyle Technology Pty Ltd. Client Processor Device
US20120036239A1 (en) * 2004-09-10 2012-02-09 Freestyle Technology Pty Ltd Client processor device for building application files from file fragments for different versions of an application
US20080207120A1 (en) * 2005-06-29 2008-08-28 Anna Kurina Wireless Data Transmission Methods, Devices, and Systems
US20100146590A1 (en) * 2007-05-09 2010-06-10 Wellbia.Com Co., Ltd. System and method for security using one-time execution code
US20120215831A1 (en) * 2011-02-22 2012-08-23 Julian Michael Urbach Software Application Delivery and Launching System

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11239905B2 (en) * 2016-07-28 2022-02-01 Spire Global Subsidiary, Inc. Systems and methods for command and control of satellite constellations
CN110224745A (zh) * 2019-06-25 2019-09-10 哈尔滨工业大学 一种卫星宽带数据上注系统及方法
CN112799700A (zh) * 2021-01-28 2021-05-14 西安电子科技大学 一种卫星地面控制系统及方法
CN112799700B (zh) * 2021-01-28 2022-11-25 西安电子科技大学 一种卫星地面控制系统及方法

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