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  2. SYNOP - Wikipedia

    en.wikipedia.org/wiki/SYNOP

    This is a code number from 0 to 4, with 0, 1 and 2 meaning data is included, and 3 and 4 indicating no precipitation data. i X is a code number indicating the manner of station operation, and the format used in group 7wwWW ; codes 1, 2 and 3 indicate a staffed station, while codes 4 to 7 indicate an automatic station.

  3. Terminal aerodrome forecast - Wikipedia

    en.wikipedia.org/wiki/Terminal_aerodrome_forecast

    TAF indicates that the following is a terminal aerodrome forecast. This line may also indicate an amended forecast (TAF AMD) or a corrected forecast (TAF COR) [3] KXYZ indicates the airport to which the forecast applies (ICAO airport code). 051730Z indicates that the report was issued on the 5th of the month at 1730 UTC (also known as Zulu ...

  4. Data Analysis Expressions - Wikipedia

    en.wikipedia.org/wiki/Data_Analysis_eXpressions

    Data Analysis Expressions (DAX) is the native formula and query language for Microsoft PowerPivot, Power BI Desktop and SQL Server Analysis Services (SSAS) Tabular models. DAX includes some of the functions that are used in Excel formulas with additional functions that are designed to work with relational data and perform dynamic aggregation .

  5. List of aviation, avionics, aerospace and aeronautical ...

    en.wikipedia.org/wiki/List_of_aviation,_avionics...

    Air data attitude heading reference system ADC Air data computer: ADD Acceptable deferred defect ADF Automatic direction finder: Navigation equipment ADI Attitude Director Indicator: ADIRS Air Data Inertial Reference System ADIRU Air Data Inertial Reference Unit: ADIZ Air defense identification zone: ADJ Adjustment Mechanical term ADM 1

  6. Convolutional code - Wikipedia

    en.wikipedia.org/wiki/Convolutional_code

    To convolutionally encode data, start with k memory registers, each holding one input bit.Unless otherwise specified, all memory registers start with a value of 0. The encoder has n modulo-2 adders (a modulo 2 adder can be implemented with a single Boolean XOR gate, where the logic is: 0+0 = 0, 0+1 = 1, 1+0 = 1, 1+1 = 0), and n generator polynomials — one for each adder (see figure below).

  7. Gillham code - Wikipedia

    en.wikipedia.org/wiki/Gillham_Code

    Gillham code is a zero-padded 12-bit binary code using a parallel nine-[1] to eleven-wire interface, [2] the Gillham interface, that is used to transmit uncorrected barometric altitude between an encoding altimeter or analog air data computer and a digital transponder.

  8. Common traffic advisory frequency - Wikipedia

    en.wikipedia.org/wiki/Common_traffic_advisory...

    Common traffic advisory frequency (CTAF) is the name given to the VHF radio frequency used for air-to-air communication at United States, and Australian non-towered airports.

  9. Two-line element set - Wikipedia

    en.wikipedia.org/wiki/Two-line_element_set

    A two-line element set (TLE, or more rarely 2LE) or three-line element set (3LE) is a data format encoding a list of orbital elements of an Earth-orbiting object for a given point in time, the epoch. Using a suitable prediction formula, the state (position and