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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html> <head> <title>page_325</title> <link rel="stylesheet" href="reset.css" type="text/css" media="all"> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> </head> <body> <table summary="top nav" border="0" width="100%"> <tr> <td align="left" width="30%" style="background: #EEF3E2"><a style="color: blue; font-size: 120%; font-weight: bold; text-decoration: none; font-family: verdana;" href="page_324.html">< previous page</a></td> <td id="ebook_previous" align="center" width="40%" style="background: #EEF3E2"><strong style="color: #2F4F4F; font-size: 120%;">page_325</strong></td> <td align="right" width="30%" style="background: #EEF3E2"><a style="color: blue; font-size: 120%; font-weight: bold; text-decoration: none; font-family: verdana;" href="page_326.html">next page ></a></td> </tr> <tr> <td id="ebook_page" align="left" colspan="3" style="background: #ffffff; padding: 20px;"> <table border="0" width="100%" cellpadding="0"><tr><td align="center"> <table border="0" cellpadding="2" cellspacing="0" width="100%"><tr><td align="left"></td> <td align="right"></td> </tr></table></td></tr><tr><td align="left"><p></p><table border="0" cellspacing="0" cellpadding="0" width="100%"><tr><td align="right"><font face="Times New Roman, Times, Serif" size="2" color="#FF0000">Page 325</font></td></tr></table><table cellpadding="0" cellspacing="0" border="0" width="100%"><tr><td height="12"></td></tr><tr><td><table cellspacing="0" width="582" cellpadding="4"><tr><td colspan="3" valign="top"><font face="Times New Roman, Times, Serif" size="2">TABLE E.5 Ionospheric Correction Variable Definitions</font></td></tr><tr><td valign="top"><font face="Times New Roman, Times, Serif" size="2">Symbol</font></td><td valign="top"><table border="0" cellspacing="0" cellpadding="0" width="100%"><tr><td align="center"><font face="Times New Roman, Times, Serif" size="2">Units</font></td></tr></table></td><td valign="top"><font face="Times New Roman, Times, Serif" size="2">Description</font></td></tr><tr><td valign="top"><table border="0" cellspacing="0" cellpadding="0" width="100%"><tr><td align="center"><font face="Symbol" size="2">a</font><font face="Times New Roman, Times, Serif" size="1"><sub><i>n</i></sub></font></td></tr></table></td><td valign="top"></td><td valign="top"><font face="Times New Roman, Times, Serif" size="2">Coefficients of cubic fit to the amplitude of vertical delay</font></td></tr><tr><td valign="top"><table border="0" cellspacing="0" cellpadding="0" width="100%"><tr><td align="center"><font face="Symbol" size="2">b</font><font face="Times New Roman, Times, Serif" size="1"><sub><i>n</i></sub></font></td></tr></table></td><td valign="top"></td><td valign="top"><font face="Times New Roman, Times, Serif" size="2">Coefficients of cubit fit to the period of the model</font></td></tr><tr><td valign="top"><table border="0" cellspacing="0" cellpadding="0" width="100%"><tr><td align="center"><font face="Times New Roman, Times, Serif" size="2"><i>E</i></font></td></tr></table></td><td valign="top"><table border="0" cellspacing="0" cellpadding="0" width="100%"><tr><td align="center"><font face="Times New Roman, Times, Serif" size="2">semicircles</font></td></tr></table></td><td valign="top"><font face="Times New Roman, Times, Serif" size="2">User-to-SV elevation angle</font></td></tr><tr><td valign="top"><table border="0" cellspacing="0" cellpadding="0" width="100%"><tr><td align="center"><font face="Times New Roman, Times, Serif" size="2"><i>A</i></font></td></tr></table></td><td valign="top"><table border="0" cellspacing="0" cellpadding="0" width="100%"><tr><td align="center"><font face="Times New Roman, Times, Serif" size="2">semicircles</font></td></tr></table></td><td valign="top"><font face="Times New Roman, Times, Serif" size="2">User-to-SV azimuth (clockwise from true north)</font></td></tr><tr><td valign="top"><table border="0" cellspacing="0" cellpadding="0" width="100%"><tr><td align="center"><font face="Symbol" size="2">l</font></td></tr></table></td><td valign="top"><table border="0" cellspacing="0" cellpadding="0" width="100%"><tr><td align="center"><font face="Times New Roman, Times, Serif" size="2">semicircles</font></td></tr></table></td><td valign="top"><font face="Times New Roman, Times, Serif" size="2">User geodetic WGS-84 latitude</font></td></tr><tr><td valign="top"><table border="0" cellspacing="0" cellpadding="0" width="100%"><tr><td align="center"><font face="Symbol" size="2">f</font></td></tr></table></td><td valign="top"><table border="0" cellspacing="0" cellpadding="0" width="100%"><tr><td align="center"><font face="Times New Roman, Times, Serif" size="2">semicircles</font></td></tr></table></td><td valign="top"><font face="Times New Roman, Times, Serif" size="2">User geodetic WGS-84 longitude</font></td></tr><tr><td valign="top"><table border="0" cellspacing="0" cellpadding="0" width="100%"><tr><td align="center"><font face="Times New Roman, Times, Serif" size="2"><i>t</i></font><font face="Times New Roman, Times, Serif" size="1"><sub>gps</sub></font></td></tr></table></td><td valign="top"><table border="0" cellspacing="0" cellpadding="0" width="100%"><tr><td align="center"><font face="Times New Roman, Times, Serif" size="2">s</font></td></tr></table></td><td valign="top"><font face="Times New Roman, Times, Serif" size="2">GPS system time</font></td></tr><tr><td valign="top"><table border="0" cellspacing="0" cellpadding="0" width="100%"><tr><td align="center"><font face="Symbol" size="2">y</font></td></tr></table></td><td valign="top"><table border="0" cellspacing="0" cellpadding="0" width="100%"><tr><td align="center"><font face="Times New Roman, Times, Serif" size="2">semicircles</font></td></tr></table></td><td valign="top"><font face="Times New Roman, Times, Serif" size="2">Earth central angle between the user position and the earth projection of the ionospheric intersection point</font></td></tr><tr><td valign="top"><table border="0" cellspacing="0" cellpadding="0" width="100%"><tr><td align="center"><font face="Symbol" size="2">l</font><font face="Times New Roman, Times, Serif" size="1"><sub><i>i</i></sub></font></td></tr></table></td><td valign="top"><table border="0" cellspacing="0" cellpadding="0" width="100%"><tr><td align="center"><font face="Times New Roman, Times, Serif" size="2">semicircles</font></td></tr></table></td><td valign="top"><font face="Times New Roman, Times, Serif" size="2">Geodetic latitude of the earth projection of the ionospheric intersection point</font></td></tr><tr><td valign="top"><table border="0" cellspacing="0" cellpadding="0" width="100%"><tr><td align="center"><font face="Symbol" size="2">f</font><font face="Times New Roman, Times, Serif" size="1"><sub><i>i</i></sub></font></td></tr></table></td><td valign="top"><table border="0" cellspacing="0" cellpadding="0" width="100%"><tr><td align="center"><font face="Times New Roman, Times, Serif" size="2">semicircles</font></td></tr></table></td><td valign="top"><font face="Times New Roman, Times, Serif" size="2">Geodetic longitude of the earth projection of the ionospheric intersection point</font></td></tr><tr><td valign="top"><table border="0" cellspacing="0" cellpadding="0" width="100%"><tr><td align="center"><font face="Times New Roman, Times, Serif" size="2"><i>t</i></font></td></tr></table></td><td valign="top"><table border="0" cellspacing="0" cellpadding="0" width="100%"><tr><td align="center"><font face="Times New Roman, Times, Serif" size="2">s</font></td></tr></table></td><td valign="top"><font face="Times New Roman, Times, Serif" size="2">Local time, range = [0,86400)</font></td></tr><tr><td valign="top"><table border="0" cellspacing="0" cellpadding="0" width="100%"><tr><td align="center"><font face="Symbol" size="2">l</font><font face="Times New Roman, Times, Serif" size="1"><sub><i>m</i></sub></font></td></tr></table></td><td valign="top"><table border="0" cellspacing="0" cellpadding="0" width="100%"><tr><td align="center"><font face="Times New Roman, Times, Serif" size="2">semicircles</font></td></tr></table></td><td valign="top"><font face="Times New Roman, Times, Serif" size="2">Geomagnetic latitude of the earth projection of the ionospheric intersection point</font></td></tr><tr><td valign="top"><table border="0" cellspacing="0" cellpadding="0" width="100%"><tr><td align="center"><font face="Times New Roman, Times, Serif" size="2">PER</font></td></tr></table></td><td valign="top"><table border="0" cellspacing="0" cellpadding="0" width="100%"><tr><td align="center"><font face="Times New Roman, Times, Serif" size="2">s</font></td></tr></table></td><td valign="top"><font face="Times New Roman, Times, Serif" size="2">Period</font></td></tr><tr><td valign="top"><table border="0" cellspacing="0" cellpadding="0" width="100%"><tr><td align="center"><font face="Times New Roman, Times, Serif" size="2"><i>x</i></font></td></tr></table></td><td valign="top"><table border="0" cellspacing="0" cellpadding="0" width="100%"><tr><td align="center"><font face="Times New Roman, Times, Serif" size="2">rad</font></td></tr></table></td><td valign="top"><font face="Times New Roman, Times, Serif" size="2">Phase</font></td></tr><tr><td valign="top"><table border="0" cellspacing="0" cellpadding="0" width="100%"><tr><td align="center"><font face="Times New Roman, Times, Serif" size="2"><i>F</i></font></td></tr></table></td><td valign="top"></td><td valign="top"><font face="Times New Roman, Times, Serif" size="2">Slant factor</font></td></tr><tr><td valign="top"><table border="0" cellspacing="0" cellpadding="0" width="100%"><tr><td align="center"><font face="Times New Roman, Times, Serif" size="2"><i>t</i>1</font><font face="Times New Roman, Times, Serif" size="1"><sub>ion</sub></font></td></tr></table></td><td valign="top"><table border="0" cellspacing="0" cellpadding="0" width="100%"><tr><td align="center"><font face="Times New Roman, Times, Serif" size="2">s</font></td></tr></table></td><td valign="top"><font face="Times New Roman, Times, Serif" size="2">L1 ionospheric correction</font></td></tr><tr><td valign="top"><table border="0" cellspacing="0" cellpadding="0" width="100%"><tr><td align="center"><font face="Times New Roman, Times, Serif" size="2"><i>t</i>2</font><font face="Times New Roman, Times, Serif" size="1"><sub>ion</sub></font></td></tr></table></td><td valign="top"><table border="0" cellspacing="0" cellpadding="0" width="100%"><tr><td align="center"><font face="Times New Roman, Times, Serif" size="2">s</font></td></tr></table></td><td valign="top"><font face="Times New Roman, Times, Serif" size="2">L2 ionospheric correction</font></td></tr></table></td></tr></table><br /><table border="0" cellspacing="0" cellpadding="0"><tr><td rowspan="5"></td> <td colspan="3" height="12"></td> <td rowspan="5"></td></tr><tr><td colspan="3"></td></tr><tr><td></td> <td><font face="Times New Roman, Times, Serif" size="3">2. From the user location and the satellite azimuth, calculate the geodetic latitude and longitude of the earth projection of the ionospheric intersection point:</font></td><td></td></tr><tr><td colspan="3"></td></tr><tr><td colspan="3" height="1"></td></tr></table><table border="0" cellspacing="0" cellpadding="0"><tr><td rowspan="5"></td> <td colspan="3" height="12"></td> <td rowspan="5"></td></tr><tr><td colspan="3"></td></tr><tr><td></td> <td><font face="Times New Roman, Times, Serif" size="3"><img src="3652a0e131d25d6ff4b6491e56b62862.gif" border="0" alt="0325-01.GIF" width="365" height="65" /></font></td><td></td></tr><tr><td colspan="3"></td></tr><tr><td colspan="3" height="1"></td></tr></table><table border="0" cellspacing="0" cellpadding="0"><tr><td rowspan="5"></td> <td colspan="3" height="12"></td> <td rowspan="5"></td></tr><tr><td colspan="3"></td></tr><tr><td></td> <td><font face="Times New Roman, Times, Serif" size="3"><img src="d24f0dfce290b1abbad96115c1d3d22d.gif" border="0" alt="0325-02.GIF" width="371" height="40" /></font></td><td></td></tr><tr><td colspan="3"></td></tr><tr><td colspan="3" height="1"></td></tr></table><table border="0" cellspacing="0" cellpadding="0"><tr><td rowspan="5"></td> <td colspan="3" height="12"></td> <td rowspan="5"></td></tr><tr><td colspan="3"></td></tr><tr><td></td> <td><font face="Times New Roman, Times, Serif" size="3">3. Calculate the local time at the earth projection of the ionospheric intersection point:</font></td><td></td></tr><tr><td colspan="3"></td></tr><tr><td colspan="3" height="1"></td></tr></table><table border="0" cellspacing="0" cellpadding="0"><tr><td rowspan="5"></td> <td colspan="3" height="12"></td> <td rowspan="5"></td></tr><tr><td colspan="3"></td></tr><tr><td></td> <td><font face="Times New Roman, Times, Serif" size="3"><img src="3f79b2747e1b3bf4515cb0800ad556d5.gif" border="0" alt="0325-03.GIF" width="316" height="22" /></font></td><td></td></tr><tr><td colspan="3"></td></tr><tr><td colspan="3" height="1"></td></tr></table><table border="0" cellspacing="0" cellpadding="0"><tr><td rowspan="5"></td> <td colspan="3" height="12"></td> <td rowspan="5"></td></tr><tr><td colspan="3"></td></tr><tr><td></td> <td><font face="Times New Roman, Times, Serif" size="3">The variable <i>t</i> in the model is, assumed to lie in the stated range. If the computation results in an out-of-range value, the user is responsible for reflecting it back in to the specified range by adding or subtracting 86,400.</font><font face="Times New Roman, Times, Serif" size="3" color="#FFFF00"></font></td><td></td></tr><tr><td colspan="3"></td></tr><tr><td colspan="3" height="1"></td></tr></table></td></tr></table><p><font size="0"></font></p>聽 </td> </tr> <tr> <td align="left" width="30%" style="background: #EEF3E2"><a style="color: blue; font-size: 120%; font-weight: bold; text-decoration: none; font-family: verdana;" href="page_324.html">< previous page</a></td> <td id="ebook_next" align="center" width="40%" style="background: #EEF3E2"><strong style="color: #2F4F4F; font-size: 120%;">page_325</strong></td> <td align="right" width="30%" style="background: #EEF3E2"><a style="color: blue; font-size: 120%; font-weight: bold; text-decoration: none; font-family: verdana;" href="page_326.html">next page ></a></td> </tr> </table> </body> </html>⌨️ 快捷键说明
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