Determining the Astronomical Refraction and Building the Radio Wave Refractive Delay Model Measured(Ⅳ)——Instantaneous Astronomical Measured Latitude

ZHANG Han-wei; YANG Lei; TIE Qiong-xian; LI Bin-hua; MAO Wei

Astronomical Research and Technology > 2005 > 2(4): 259-264.

ZHANG Han-wei, YANG Lei, TIE Qiong-xian, LI Bin-hua, MAO Wei. Determining the Astronomical Refraction and Building the Radio Wave Refractive Delay Model Measured(Ⅳ)——Instantaneous Astronomical Measured Latitude[J]. Astronomical Research and Technology, 2005, 2(4): 259-264.

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Determining the Astronomical Refraction and Building the Radio Wave Refractive Delay Model Measured(Ⅳ)——Instantaneous Astronomical Measured Latitude

1.
National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011, China
2.
Kunming University of Science and Technology, Kunming 650051, China

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Received Date: May 26, 2005
Revised Date: July 12, 2005
Published Date: October 14, 2005

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Abstract

Abstract

According to the principle of determining the astronomical refraction and requisites for building radio wave refractive delay corrective models, strict requirements of the instantaneous astronomical measured latitude are described, and the reasons why the instantaneous measured latitudes obtained via classic measuring instruments and by space geodetic surveying techniques are not suitable here are analyzed in the paper. A novel approach to find the instantaneous measured latitudes by differences between measured and calculated hour angles in given azimuths except for the meridian is presented so as to avoid residual errors of the refraction corrective value. Some basic demands on observational data processing are brought forward. Finally the feasibility of implementing the approach via the planned special measuring instrument is discussed.
- astronomical latitude,
- vertical circle,
- hour angle

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