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SP3精密星历标准产品第3号说明
The National Geodetic Survey Standard GPS Format SP3
Paul R. Spofford
National Geodetic Survey
National Ocean Service, NOAA
Silver Spring, MD 20910-3282, USA
and
Benjamin W. Remondi, PhD
P.O. Box 37
Dickerson, Maryland 20842, USA
INTRODUCTION
Why do we need standardized orbit formats? Standard orbit
formats provide many advantages, the most obvious being orbit
exchange. ASCII and binary formats both satisfy this function,
but ASCII does it with greater generality because binary formats
are computer operating system dependent.
The NGS standard GPS orbit format SP1 was introduced in
Remondi (1985). After a few years of use, it was realized that
enhancements would eventually be required. The orbit type, the
coordinate system, and the GPS week associated with the first
epoch of the ephemeris file were added in a manner that did not
impact the formats and existing software.
A more serious omission of the initial NGS orbit format was
the satellite clock corrections. This omission reflected an
earlier belief that all geodetic applications could be
accomplished in differential mode. Today we realize that
standard formats serve a wider community and include those who
find it inconvenient to operate in a differential mode. A user
can operate in single-receiver or navigation mode based on the
broadcast message. However, the user can get more accurate
(post-processed) results if the precise orbital data and the
associated satellite clock corrections, which were determined
simultaneously with those precise orbits, are available. This
becomes even more valuable when the broadcast orbit and clock
information are intentionally degraded.
Thus, a new NGS orbit format was proposed in Remondi (1989),
and modified and adopted in Remondi (1991). This format is
similar to the original NGS orbit
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