1 (Ground-Based

Augmentation System: GBAS) GNSS

GBASGNSS GNSS

GBAS

I GBAS

III GBAS 2018 [1]

GBAS

GBAS

ICAOICAO APAC GBAS/SBAS Implementation Task Force GBAS SBAS

GBAS

2021 GBAS

GBAS

[2]

GBAS

GBAS

GBAS

GBAS

I GBAS

GBAS 2 GBAS

60 km 1000 km

GNSS

GBAS

1

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令和２年度（第20回）電子航法研究所研究発表会

2

GBAS

6

12

1km mm (GPS L1(1.57542GHz) )

10 100

GBAS

GBAS

GNSS

( ) [1]

(1)

(2)

35 km

3

[1]( ) (2)

(3)

( )

( )( ) ( )

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令和２年度（第20回）電子航法研究所研究発表会

1III GBAS

[1] [3]

[4, 5]

[1]

GBAS [6, 7]

4 2012 2016

ICAO(Ionospheric Studies Task Force: ISTF)

GBAS( ) [6, 7]( ) 600 mm/km

III GBAS

10 km

[5]

III GBAS

( ) 25–200 km

( ) 0–80 m ( ) 0–1500 m/s

( )

( ) (g) < 750 m/s 500 mm/km

750 < 1500 m/s 100 mm/km

GBASICAO ISTF

[8]GBAS

GBAS

GBAS

GBAS ICAOGBAS

GBAS

10 kmGBAS

23 NM 43 km

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令和２年度（第20回）電子航法研究所研究発表会

GBAS

10 km

22

10 km3 GNSS 10 km

3

GNSSL1

2 GNSS

600 mm/km 100 m/s

10 km1 Hz

mm/km

1 mm/km10 km

10 mm

2 FAA2

Long-Term Ionosphere Anomaly Monitoring (LTIAM) [9]

Single-Frequency Carrier-Based and Code-Aided (SF-CBCA) [10, 11]

SF-CBCA

SF-CBCA 3

5 1,2 2, 3

3, 1 SF-CBCA

SF-CBCA

30

(4)

3 22

3

5.1

( )

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令和２年度（第20回）電子航法研究所研究発表会

(CDF)

CDF CDF 10-7

6

CDF 5.3

3

4600 mm/km

GBAS

23

[5] 7

5.4 5.1 5.3 C Python

6

GBAS

2011 8

(KMITL) [12, 13]

2019

GBAS

GBAS

6.

GBAS

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令和２年度（第20回）電子航法研究所研究発表会

GBAS

GBASGBAS

GBAS

GBASGBAS

[1] International Civil Aviation Organization (2018), ”Annex 10 to the Convention on the International Civil Aviation,” Amendment 91

[2] M. Nakamura, S. Saito, and T. Yoshihara (2019), “Characteristics of Ionospheric Gradients in the Transition Region from Magnetic Low to Mid-latitudes for GBAS Implementation,” Proc. ION Pacific PNT 2019, pp.827-834.

[3] S. Pullen, Y. S. Park, P. Enge (2009), “Impact and mitigation of ionospheric anomalies on ground-based augmentation of GNSS,” Radio Science, vol.44, pp.RS0A21, doi:10.1029/2008RS004084

[4] J. Lee, M. Yoon, S. Pullen, J. Gillespie, M. Mather, R. Cole, J. Rodrigues de Souza, P. Doherty, R. Pradipta (2015), “Preliminary results from ionospheric threat model development to support GBAS operations in the Brazilian Region,” Proc. ION GNSS+ 2015, pp.1500-1506

[5] S. Saito and T. Yoshihara (2018), “Evaluation of extreme ionospheric total electron content gradient associated with plasma bubbles for GNSS Ground-Based Augmentation System,” Radio Science, vol.52, pp.951-962,

doi:10.1002/2017RS006291. [6] S. Saito, S. Sunda, J. Lee, S. Pullen, S. Supriadi,

T. Yoshihara, M. Terkildsen, F. Lecat, and ICAO APANPIRG Ionospheric Studies Task Force (2017), “Ionospheric delay gradient model for GBAS in the Asia-Pacific region,” GPS Solutions, vol.21, pp.1937-1947, doi:10.1007/s10291-017-0662-1.

[7] International Civil Aviation Organization Asia and Pacific Air Navigation Planning and Implementation Regional Group (2016), “GBAS Ionospheric Threat Model for APAC Region.”

[8] International Civil Aviation Organization Asia and Pacific Air Navigation Planning and Implementation Regional Group (2016), “GBAS Safety Assessment Guidance Related to Anomalous Ionospheric Conditions.”

[9] S. Jung, J. Lee (2012), “Long-term ionospheric anomaly monitoring for ground based augmentation systems,” Radio Science, vol.47, pp.RS4006.

[10] S. Fujita, T. Yoshihara, and S. Saito (2010), “Determination of ionospheric gradients in short baselines by using single frequency measurements,” J. Aeronaut. Astronaut. Aviat., vol.A42, pp.269-275.

[11] S. Saito, and T. Yoshihara (2012), “Absolute gradient monitoring for GAST-D with a single-frequency carrier-phase based and code-aided technique,” Proc. ION GNSS 2012, pp.3055-3065.

[12] S. Rungraengwajiake, P. Supnithi, S. Saito, N. Siansawasdi, and A. Saekow (2015), “Ionospheric delay gradient monitoring for GBAS by GPS stations near Suvarnabhumi airport, Thailand,” Radio Science, vol.50, pp.1076-1085, doi:10.1002/2015RS005738.

[13] J. Budtho, P. Supnithi, and S. Saito, (2018), “Analysis of quiet time vertical ionospheric delay gradients around Suvarnabhumi airport, Thailand,” Radio Science, vol.53 doi:10.1029/ 2018RS006606.

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令和２年度（第20回）電子航法研究所研究発表会