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    Archived pages: 311 . Archive date: 2014-01.

  • Title: 2.3 Satellites
    Descriptive info: 2.. 3 Satellites.. The Argos instrument flies aboard.. POES (Polar Orbiting Environmental Satellites) satellites.. of the National Oceanic and Atmospheric Administration (.. NOAA.. ) and.. MetOp,.. of the European Organization for the Exploitation of Meteorological Satellites (.. Eumetsat.. ).. The first.. MetOp.. satellite was launched on 19 October 2006.. Operational satellites:.. Satellites.. Launch date.. Instrument.. High Data rate and Downlink capabilities.. SARAL.. 25 February 2013.. Argos-3.. X.. METOP-B (MB).. 17 September 2012.. NOAA-N' (NP).. 6 February 2009.. METOP-A (MA).. 19 October 2006.. NOAA-18 (NN).. 20 May 2005.. Argos-2.. NOAA-17 (NM).. 24 June 2002.. NOAA-16 (NL).. 21 September 2000.. NOAA-15 (NK).. 13 May 1998.. Argos messages are received by the satellite then simultaneously:.. 1/.. stored on the onboard recorder and retransmitted to the ground each time the satellite passes over one of the three main receiving stations: Wallops Island (Virginia, United States), Fairbanks (Alaska, United States), and Svalbard (Norway), or.. 2/.. retransmitted to the ground to regional reception stations in the satellites's field of view.. The satellites are on  ...   Therefore,.. each satellite passes within visibility of any given transmitter at almost the same local time each day.. The time taken to complete a revolution around the Earth is approximately 100 minutes.. At any given time, each satellite simultaneously sees all transmitters within an.. approximate 5000 kilometer diameter footprint , or visibility circle.. As the satellite proceeds in orbit, the visibility circle sweeps a 5000 kilometer swath around the Earth, covering both poles.. Due to the Earth's rotation, the swath shifts 25° west (2800 km at the Equator) around the polar axis at each revolution.. This results in overlap between successive swaths.. Since overlap increases with latitude, the number of daily passes over a transmitter also increases with latitude.. At the poles,.. the satellites see each transmitter on every pass, approximately 14 times per day per satellite.. The.. period during which the satellite can receive messages from a platform.. is equivalent to the time during which the platform is within its visibility.. On average this is 10 minutes..

    Original link path: /manual/2-system/23_satellites.htm
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  • Title: 2.4 Receiving stations
    Descriptive info: 4 Receiving stations.. Nearly 60 stations receive real time data from the satellites and retransmit them to processing centers.. This network of L band antennas, distributed to provide worldwide coverage, is a key element of the Argos service.. Main receiving stations.. The three main receiving stations collect all  ...   providing worldwide cover.. These three stations are Wallops Island and Fairbanks in the United States and Svalbard in Norway.. Data received by the satellites are retransmitted to regional stations in real time if the station is within satellite visibility.. The main receiving stations also receive data in real time..

    Original link path: /manual/2-system/24-stations.htm
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  • Title: 2.5 Processing centers
    Descriptive info: 5 Processing centers.. Two processing centers with redundant operation, one near.. Washington D.. C.. (United States).. and the other in.. Toulouse, France.. , process all received data.. The computers calculate locations and process the received data.. The following processing is carried out at the global processing centers:.. check of message quality, reception level, time-tagging, transmitter identification number, sensor message lengths and received frequency value (to compute the location);.. message time-tagging in coordinated universal time (UTC);.. message classification by platform and by chronological order;.. data processing.. All these results are stored and made available to users.. © Christian Rivière..

    Original link path: /manual/2-system/25-processing_centers.htm
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  • Title: 2.6 User Services centers across the world
    Descriptive info: 6 User Services centers across the world.. The User Services teams are the first contact points for any request for service or technical support from Argos users.. They manage all data base declarations to allow users to obtain data correctly and act as an interface with Argos's technical staff.. If they cannot respond directly to user requests, they will direct users to experts able to provide a satisfactory answer.. North America.. CLS America Inc.. 4300 Forbes Blvd.. , Suite 110.. Lanham, MD 20706.. Tel: +1 301 925 4411.. Fax: +1 301 925 8995.. Email:.. userservices@clsamerica.. com.. Japan.. Cubic-I Ltd.. Bluebell bldg.. 7F.. 2-15-9 Nishi-Gotanda.. Shinagawa-ku -  ...   Pacific.. (Satellite IT Pty Ltd).. P.. O.. Box 3108 Domain Road LPO.. South Yarra.. Victoria 3141.. Tel: +61 418 368 917.. guan@clsargos.. au.. South America.. CLS Perú.. Jr.. Trinidad Moran 639.. Lince, Lima.. Peru.. Tel: +51 1 440 2717.. Fax: +51 1 421 2433.. gsirech@clsperu.. pe.. Southeast Asia.. PT CLS Argos Indonesia.. JI Jend Gatot Subroto, Kav 56.. Kuningan Timur, Setiabundi.. Jakarta, Selatan, 12950, Indonesia.. Tel: +62 215 264 266.. Fax: +62 215 264 265.. sales@clsargos.. id.. Worldwide.. CLS.. 8-10, rue Hermès.. Parc Technologique du Canal.. 31520 Ramonville Saint-Agne.. France.. Tel: +33 (0)5 61 39 47 20.. Fax: +33 (0)5 61 39 47 97.. useroffice@cls.. fr..

    Original link path: /manual/2-system/26_user_services.htm
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  • Title: 3.1 Overview
    Descriptive info: 3.. 1 Overview.. Argos platforms automatically transmit messages which are received by satellites and relayed to Argos processing centers to compute results and make them available.. Locations are computed from all the messages received during a satellite pass.. Argos system users have the advantage of two independent positioning modes:.. Argos location:.. Argos centers calculate a transmitter's location using the Doppler Effect on transmission frequency.. Since 2011, Argos users must choose between two location  ...   In 2011, this algorithm was introduced to provide more positions and better accuracy.. GPS positioning:.. On request from the user, a specific processing module extracts the GPS positions included in the messages, validates them and distributes them in the same format as the Argos locations.. In both cases, the coordinates used are the latitude and longitude and the reference system is WGS 84 (World Geodetic System 1984).. Consulting a platform's location with ArgosWeb..

    Original link path: /manual/3-location/31-overview.htm
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  • Title: Content
    Descriptive info: Argos User's Manual.. 1.. Introduction.. System components.. Location calculations.. 2 Argos location principle.. 2.. 1 Physics and Measurement: The Doppler Effect.. 2 The positioning algorithm based on Least squares analysis (unchanged since.. 3 The positioning algorithm based on Kalman filtering (introduced in 2011).. 4 Error estimation.. 5 Altitude estimations.. 3 Transmitting GPS data via Argos.. 4 Location classes.. 5 Choosing a location algorithm.. 6 Service Plus/Auxiliary Location Processing.. 4.. Data processing.. 5.. How to open an Argos account.. 6.. How to access Argos data..

    Original link path: /manual/whgdata/whlstt3.htm
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  • Title: Content
    Descriptive info: 5.. 1 Comparative table..

    Original link path: /manual/whgdata/whlstt4.htm
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  • Title: 3.5 Choosing a location algorithm
    Descriptive info: CLS r.. ecommends the new algorithm based on Kalman filtering for all applications.. because it introduces significant improvements in the number of positions and their accuracy, especially for applications where just a few messages are received per satellite pass or for platforms operating in difficult transmission conditions.. This is true.. even when a platform is likely to have big gaps in average speed.. This is also true.. when there are changes in frequency.. :.. For moderate frequency changes ( 400 Hz) due for instance to temperature variation,.. For more important frequency changes (reinitialization or oscillator fluctuation).. However, for those.. users who need very long time-series of homogenous data (several years), we recommend to continue  ...   calculate a position.. Two.. One.. Accuracy estimation.. Error estimates available as an ellipse error with at least 4 messages.. Partial information with 2 or 3 messages.. Error estimates available as an ellipse error with at least 1 message.. Number of solutions provided.. Two (nominal and mirror solutions).. One (nominal solution).. Digital elevation model.. USGS GTOPO30.. This value-added service.. provides users with complementary information about transmitter performance.. It also distributes.. non-standard locations.. , including locations calculated with less than four messages (Locations classes A, B) and locations that fail plausibility tests (Class Z).. This service is very useful in certain cases, and is thus activated by default for a number of applications, including animal tracking..

    Original link path: /manual/3-location/35_choosing_a_location_algorithm.htm
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  • Title: 4.1 Overview
    Descriptive info: Argos messages are sequences of binary digits.. The data contained in these messages are processed then distributed by the Argos system.. Data processing operations range from straightforward binary-to-decimal conversion to sophisticated transfer functions.. The system can run different types of processing on the same data, so that raw data can be distributed as validated physical values as well.. In addition, if the messages contain GPS positions, these may also be decoded and distributed in the same way as Argos locations.. 1.. 1 Observation processing vs message processing.. The above schema illustrates the different steps involved in collecting and processing in-situ data at CLS:.. Data acquisition:.. The platform collects data and dates the observations.. Message building:.. The measurements are dated, encoded and recorded in messages.. Messages sent to satellites:.. Messages are then sent by the Argos transmitter (PTT) or modem (PMT) to the satellites.. Data received by satellites:.. The satellites receive the messages, date them and measure signal frequency.. Messages transmitted back to the ground:.. The satellites then retransmit to ground stations all received messages, along with  ...   Since May 20, 2008, complete Observation processing (Step 7) is available for all Argos platforms.. User results are currently available in two formats:.. Message format (Step 6):.. User results are grouped together by satellite pass, then distributed along with a location (corresponds to the location calculated for the satellite pass).. Observation format (Step 7):.. Physical data (sensor measurements) are dated and assigned a location based on the time the observation was made and the best corresponding location (calculated as close to the observation time as possible).. 2 Multi-format data processing.. The Argos processing system can handle several message formats for one transmitter.. A message format is a specific type of message sent by an Argos platform.. Each format has a specific structure.. The Argos processing system can now handle processing of a variety of formats for the same platform.. Here is an example of.. how the processing system works.. for an Argos platform transmitting three different types of messages:.. Three different types of messages from one platform are converted into physical values by the Argos processing system..

    Original link path: /manual/4-processing/41_overview.htm
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  • Title: Content
    Descriptive info: 2 Message format recognition.. 3 Message segmentation.. 4 Data decoding.. 5 Observation processing.. 6 Should I choose observations or messages?.. B1 Curve.. B2 Curve.. B3 Curve.. B4 Curve..

    Original link path: /manual/whgdata/whlstt6.htm
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  • Title: 4.2 Message format recognition
    Descriptive info: Once the system recognizes a binary message based on its Argos ID number, then the message format must be recognized, so that specific processing can be applied.. Several identification procedures are available:.. The system recognizes all messages from a platform and systematically applies the same processing.. This type of recognition offers the possibility of processing messages of varying length in an identical manner (no default is available).. The system recognizes the  ...   message is different than the declared length, the data are distributed in 8-bit hexadecimal words (default format).. 3/.. The system recognizes the message format through an equation.. of the type [f(Ax + By + C)], x and y being 2 values encoded in a part of the message, and processes accordingly.. With this type of recognition, if no equation is verified the data will be distributed in 8-bit hexadecimal words (default format)..

    Original link path: /manual/4-processing/42_format.htm
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  • Archived pages: 311