Limits...
Project Loon based augmentation for global ionospheric modeling over Southern Hemisphere

View Article: PubMed Central - PubMed

ABSTRACT

Global ionospheric products of vertical total electron content (VTEC) derived from GNSS measurements may have low accuracy over oceans and southern latitudes where there are not rich observations. Project Loon provides a great opportunity to enhance the measurements over those areas. In this contribution, a simulation of Project Loon based augmentation for global ionospheric modeling is performed by using the international reference ionosphere (IRI) which could simulate VTEC measurements for the balloons. The performance of the enhanced method based on simulation of Project Loon is investigated by comparing with VTEC maps from Ionosphere Associate Analysis Centers (IAACs) as well as IGS final GIMs. The comparison indicates that there is a better consistency between the VTEC maps by the enhanced method and IGS final GIMs. Also, obvious improvements of RMS maps in GIMs for the middle latitudes and southern latitudes are enabled by the augmentation of Project Loon. Additionally, JASON data are used to validate the specific improvement of the VTEC maps. The results show that the performance of VTEC maps is improved slightly, especially in southern latitudes. It is possible that the VTEC maps could be improved significantly by using real GPS measurements from balloons of Project Loon in the near future.

No MeSH data available.


Related in: MedlinePlus

Bias and RMS values from the comparison of VTEC maps by original solution and Project Loon based augmentation solution and the IGS final GIMs for DOY 152–181 in 2015.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC5382668&req=5

f4: Bias and RMS values from the comparison of VTEC maps by original solution and Project Loon based augmentation solution and the IGS final GIMs for DOY 152–181 in 2015.

Mentions: VTEC maps generated by the two solutions are now further compared with the IGS final combined products and the products from IAACs for DOY 152–181, 2015. IGS has been providing reliable ionospheric products by combining GIMs produced by CODE, JPL, ESA and UPC since 1998. In this study, the two kinds of VTEC maps by the original solution and the proposed Project Loon augmented solution are compared with GIMs from CODE, JPL, ESA and UPC and the IGS final combined GIMs. As shown in Figs 4 and 5, the bias and RMS values of the differences are calculated between our VTEC maps and the IGS final GIMs as well as the products from IAACs. In the figures, WHU_ORG and WHU_IRI represent the VTEC maps by the original solution and the Project Loon augmented solution using simulation with IRI 2012 model, respectively. In Fig. 4, the black and orange dotted lines show the bias of differences between WHU_ORG and WHU_IRI and the IGS final GIMs, respectively. The red and blue dotted lines show the RMS values of differences between WHU_ORG and WHU_IRI and the IGS final GIMs, respectively. The bias and RMS values are presented by dotted lines with the same color in Fig. 5 to show the differences between WHU products and GIMs from IAACs.


Project Loon based augmentation for global ionospheric modeling over Southern Hemisphere
Bias and RMS values from the comparison of VTEC maps by original solution and Project Loon based augmentation solution and the IGS final GIMs for DOY 152–181 in 2015.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5382668&req=5

f4: Bias and RMS values from the comparison of VTEC maps by original solution and Project Loon based augmentation solution and the IGS final GIMs for DOY 152–181 in 2015.
Mentions: VTEC maps generated by the two solutions are now further compared with the IGS final combined products and the products from IAACs for DOY 152–181, 2015. IGS has been providing reliable ionospheric products by combining GIMs produced by CODE, JPL, ESA and UPC since 1998. In this study, the two kinds of VTEC maps by the original solution and the proposed Project Loon augmented solution are compared with GIMs from CODE, JPL, ESA and UPC and the IGS final combined GIMs. As shown in Figs 4 and 5, the bias and RMS values of the differences are calculated between our VTEC maps and the IGS final GIMs as well as the products from IAACs. In the figures, WHU_ORG and WHU_IRI represent the VTEC maps by the original solution and the Project Loon augmented solution using simulation with IRI 2012 model, respectively. In Fig. 4, the black and orange dotted lines show the bias of differences between WHU_ORG and WHU_IRI and the IGS final GIMs, respectively. The red and blue dotted lines show the RMS values of differences between WHU_ORG and WHU_IRI and the IGS final GIMs, respectively. The bias and RMS values are presented by dotted lines with the same color in Fig. 5 to show the differences between WHU products and GIMs from IAACs.

View Article: PubMed Central - PubMed

ABSTRACT

Global ionospheric products of vertical total electron content (VTEC) derived from GNSS measurements may have low accuracy over oceans and southern latitudes where there are not rich observations. Project Loon provides a great opportunity to enhance the measurements over those areas. In this contribution, a simulation of Project Loon based augmentation for global ionospheric modeling is performed by using the international reference ionosphere (IRI) which could simulate VTEC measurements for the balloons. The performance of the enhanced method based on simulation of Project Loon is investigated by comparing with VTEC maps from Ionosphere Associate Analysis Centers (IAACs) as well as IGS final GIMs. The comparison indicates that there is a better consistency between the VTEC maps by the enhanced method and IGS final GIMs. Also, obvious improvements of RMS maps in GIMs for the middle latitudes and southern latitudes are enabled by the augmentation of Project Loon. Additionally, JASON data are used to validate the specific improvement of the VTEC maps. The results show that the performance of VTEC maps is improved slightly, especially in southern latitudes. It is possible that the VTEC maps could be improved significantly by using real GPS measurements from balloons of Project Loon in the near future.

No MeSH data available.


Related in: MedlinePlus