KEYWORDS: Satellites, Solar radiation models, Kinematics, Satellite navigation systems, Automatic control, Solar radiation, Data modeling, Data processing, Data analysis, Statistical modeling
Periodical orbit maneuver makes a serious problem for navigation users to get correct Geostationary
(GEO) orbit information in real-time. As a result, it is very difficult to use GEO satellite for navigation
application purpose. In this presentation, the precision of the orbit determination of GEO satellite
without maneuver operation has been introduced at first. Then, two strategies of orbit determination
during satellite maneuvers are discussed in details. One method is called as maneuver force modeling;
the other is empiric force parameter estimation. The results show the residual is of the order of 40 cm
by using these strategies, and the position difference between dynamic orbit and kinematics orbit is
about 10 m.
Real-time high-precision GPS positioning and navigation requires that cycle-slip in the undifferenced carrier-phase
measurements can be detected instantaneously. A slip of only a few cycles can bias measurements enough to make
centimeter-level positioning or navigation difficult. Over the past decade a number of methods have been developed to
detect and repair cycle slips. The majority of methods invariably are used in the post-processing cycle-slip detection. A
method has been developed from various exiting techniques, that provides real-time cycle-slip detection (i.e., using only
current epoch's GPS carrier-phase measurements). The approach utilizes two linear combinations, the Geometry-free and
the Melbourne-Wübbena combination. The low degree polynomial fitting and running-average filter are used to detect
cycle slips. Simulation tests are conducted to the kinematic data. Results indicate that single-cycle slips can be reliably
detected instantaneously.
Under the financial support of several Chinese national scientific projects, PANDA (Positioning And Navigation Data
Analyst) software developed originally by Wuhan University has achieved the advanced level in the world. PANDA is
currently recognized as a main research tool in several famous institutes in the GNSS community. In this paper, the
recent development of PANDA software is introduced, including the COSMIC orbit determination in low Earth orbits,
the real-time GPS satellite orbit and clock determination and precise point positioning with ambiguity resolution. It is
concluded that PANDA is of great improvement in the past five years, and more advancement will be made in its
pragmatic aspect especially in engineering applications.
Conference Committee Involvement (1)
International Conference on Earth Observation Data Processing and Analysis
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