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Precise Orbit Solution for Swarm Using Space-Borne GPS Data and Optimized Pseudo-Stochastic Pulses.

Bingbing Zhang1, Zhengtao Wang2, Lv Zhou3,4

  • 1School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China. bbzhang@whu.edu.cn.

Sensors (Basel, Switzerland)
|March 25, 2017
PubMed
Summary
This summary is machine-generated.

Optimized pseudo-stochastic pulses enhance Swarm satellite precise orbit determination using GPS data. This method achieves 2-4 cm accuracy, crucial for geomagnetic and gravity field recovery.

Keywords:
Swarmorbit accuracyprecise orbit determinationpseudo-stochastic pulsesreduced-dynamic methodspace-borne dual-frequency GPS data

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Area of Science:

  • Earth Observation
  • Satellite Geodesy
  • Space Physics

Background:

  • The European Space Agency's Swarm mission, launched in 2013, comprises three satellites crucial for Earth's magnetic field studies.
  • Precise orbit determination (POD) is fundamental for the success of the Swarm mission and its scientific objectives.

Purpose of the Study:

  • To assess the accuracy of Swarm zero-differenced (ZD) reduced-dynamic orbit solutions derived from space-borne GPS data.
  • To optimize the use of pseudo-stochastic pulses under high ionospheric activity for improved Swarm orbit determination.

Main Methods:

  • Utilized Swarm space-borne GPS data from October 1-25, 2014, for reduced-dynamic orbit determination.
  • Optimized pseudo-stochastic pulses with a 6-minute interval and 10⁻² mm/s a priori standard deviation in radial, along-track, and cross-track directions.
  • Assessed orbit quality using GPS phase observation residuals and compared with ESA's Precise Science Orbits (PSOs).

Main Results:

  • Optimized pseudo-stochastic pulses significantly improved Swarm ZD reduced-dynamic POD.
  • During high ionospheric activity, mean GPS phase residuals were 9-11 mm.
  • Swarm orbit solutions achieved 2-4 cm accuracy in radial, along-track, and cross-track directions, validated by PSOs and Satellite Laser Ranging (SLR).
  • Swarm-B exhibited better orbit quality than Swarm-A and Swarm-C.

Conclusions:

  • The optimized pseudo-stochastic pulse approach provides accurate Swarm orbits essential for the mission.
  • Achieved orbit accuracy is suitable for geomagnetic, geoelectric, and gravity field recovery applications.
  • The study demonstrates a robust method for precise orbit determination of Earth observation satellites.