GNSS-R concept extended by a fine orbit tuning

Klokočník, Jaroslav; Bezděk, Aleš; Kostelecký, Jakub

doi:10.1016/j.asr.2011.12.008

Cited by 2 publications

(2 citation statements)

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“…Pervious researchers had also stated some results about the GNSS-R spatial and temporal resolutions, but early simulations were conducted based on GPS and one LEO satellite, and other late results are lack of details [24][25][26][27][28]31]. Here, we describe the simulation and analysis methods, as well as the parameters' values, used in this paper, and conduct the experiments using 119 GNSS satellites and 8 LEO satellites.…”

Section: Discussionmentioning

confidence: 99%

Spatiotemporal Evaluation of GNSS-R Based on Future Fully Operational Global Multi-GNSS and Eight-LEO Constellations

Gao

Wang

et al. 2018

Remote Sensing

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Spaceborne GNSS-R (global navigation satellite system reflectometry) is an innovative and powerful bistatic radar remote sensing technique that uses specialized GNSS-R instruments on LEO (low Earth orbit) satellites to receive GNSS L-band signals reflected by the Earth's surface. Unlike monostatic radar, the illuminated areas are elliptical regions centered on specular reflection points. Evaluation of the spatiotemporal resolution of the reflections is necessary at the GNSS-R mission design stage for various applications. However, not all specular reflection signals can be received because the size and location of the GNSS-R antenna's available reflecting ground coverage depends on parameters including the on-board receiver antenna gain, the signal frequency and power, the antenna face direction, and the LEO's altitude. Additionally, the number of available reflections is strongly related to the number of GNSS-R LEO and GNSS satellites. By 2020, the Galileo and BeiDou Navigation Satellite System (BDS) constellations are scheduled to be fully operational at global scale and nearly 120 multi-GNSS satellites, including Global Positioning System (GPS) and Global Navigation Satellite System (GLONASS) satellites, will be available for use as illuminators. In this paper, to evaluate the future capacity for repetitive GNSS-R observations, we propose a GNSS satellite selection method and simulate the orbit of eight-satellite LEO and partial multi-GNSS constellations. We then analyze the spatiotemporal distribution characteristics of the reflections in two cases: (1) When only GPS satellites are available; (2) when multi-GNSS satellites are available separately. Simulation and analysis results show that the multi-GNSS-R system has major advantages in terms of available satellite numbers and revisit times over the GPS-R system. Additionally, the spatial density of the specular reflections on the Earth's surface is related to the LEO inclination and constellation construction.

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Section: Discussionmentioning

confidence: 99%

Spatiotemporal Evaluation of GNSS-R Based on Future Fully Operational Global Multi-GNSS and Eight-LEO Constellations

Gao

Wang

et al. 2018

Remote Sensing

View full text Add to dashboard Cite

show abstract

“…But a choice of orbit repeat or avoidance of a specific 'repeat' to fulfil various requirements of satellite missions was important for altimetry satellites (e.g., Reigber et al, 1988) and is important for new satellites (like bistatic altimetry with GNSS, Klokočník et al, 2011) as well as for planetary missions to study gravity fields of the celestial bodies . The exact condition for commensurability is that the satellite is in the exact b/a orbital resonance when it performs b revolutions or nodal periods (from one orbital Fig.…”

Section: Introduction Motivation and Aim Of This Workmentioning

confidence: 99%