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Delta UT1

Calculate difference between principal Universal Time (UT1) and Coordinated Universal Time (UTC) according to International Astronomical Union (IAU) 2000A reference system

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  • Library:

  • 航空空间/ Environment / Celestial Phenomena

    航空空间/ Utilities / Axes Transformations

  • Delta UT1 block

Description

Delta UT1块根据IAU 2000A参考系统和地球取向数据计算主UT1和UTC之间的差异。默认情况下，该块使用国际地球旋转和参考系统服务（IERS）数据的列表。此列表包含IER提供的测量和计算（预测）数据。IERS测量并计算一组预定日期的数据。对于在列表中列出的那些之后的日期，Delta UT1calculates the data using this equation, limiting the values to +/- .9s:

UT1-UTC=0.5309-0.00123(MJD-57808)-(UT2-UT1)

Ports

Input

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UT1 for UTC, specified as a modified Julian date. Use themjuliandatefunction to convert the UTC date to a modified Julian date.

Data Types:double

Output Arguments

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Difference between UT1 and UTC.

Data Types:double

Parameters

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Custom list of Earth orientation data, specified in a MAT-file.

Programmatic Use

Block Parameter:FileName
Type: character vector
Values:'aeroiersdata.mat'|MAT-file
Default:'aeroiersdata.mat'

Out-of-range block behavior, specified as follows.

Action Description

None

No action.

Warning

Warning in the MATLAB®命令窗口，模型模拟继续。

错误(default)

MATLAB返回一个例外,模型仿真停止s.

Programmatic Use

Block Parameter:action
Type: character vector
Values:'None'|'Warning'|'Error'
Default:'Warning'

Web site or Earth orientation data file containing the Earth orientation data according to the IAU 2000A, specified as a web site address or file name.

Note

If you receive an error message while accessing the default site, use one of these alternate sites:

  • https://datacenter.iers.org/data/latestVersion/10_FINALS.DATA_IAU2000_V2013_0110.txt

  • ftp://cddis.gsfc.nasa.gov/pub/products/iers/finals2000A.data

Programmatic Use

Block Parameter:iersurl
Type: character vector
Values:'https://maia.usno.navy.mil/ser7/finals2000A.data'|网站地址|文件名
Default:'https://maia.usno.navy.mil/ser7/finals2000A.data'

Folder for IERS data file, specified as a character array or string. Before running this function, createfoldernamewith write permission.

To create the IERS data file in the destination folder, click the创造button.

Programmatic Use

Block Parameter:folder
Type: character vector
Values:'Current Folder'|folder name
Default:'Current Folder'

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

Version History

Introduced in R2017b

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Behavior changed in R2020b

See Also

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