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Improving High-Frequency Ocean Radar Data Quality through FOL Optimization

FOL 최적화를 통한 고주파 해양레이더 자료 품질 개선

Seungho Lee12
,
Jae Yeob Kim3*
,
Hyuk-Man Cho3
,
Se Young Park4
이 승호12
,
김 재엽3*
,
조 혁만3
,
박 세영4
1Ocean Science and Technology School, Korea Maritime and Ocean University, Busan 49112, Korea
2Oceanographic Forecast Division, Korea Hydrographic and Oceanographic Agency, Busan 49111, Korea
3Oceantech Co., Ltd, Goyang 10440, Korea
4South Sea Hydrographic and Oceanographic Office, Korea Hydrographic and Oceanographic Agency, Busan 48755, Korea
1한국해양대학교 해양과학기술전문대학원 해양과학기술융합학과 (49112) 부산광역시 영도구 태종로 727
2국립해양조사원 해양예보과 (49111) 부산광역시 영도구 해양로 351
3오션테크(주) (10440) 경기도 고양시 덕양구 행주산성로 144번길 57
4국립해양조사원 남해해양조사사무소 (48755) 부산광역시 동구 충장대로 351
*Corresponding Author
2 May 2025. pp. 1-17
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Abstract

The process of detecting and distinguishing the first-order peak (representing ocean currents) and the second-order peak (representing waves) in the Doppler spectrum received by HF-Radar systems is referred to as First Order Line (FOL) separation. Accurate identification of the null point between these peaks is crucial for precise current velocity estimation. This study reprocessed radial velocity data using optimized FOL parameters and evaluated the quality improvement by comparing the results with drifter buoy velocity data. The experimental results showed that the optimal FOL parameters varied across different observation stations. However, overall improvements were observed, with increased correlation coefficients and reduced root mean square errors. Additionally, the data coverage area expanded, leading to improved data collection rates. In conclusion, this study demonstrates that optimizing FOL parameters in HF-Radar systems significantly enhances the accuracy and quality of radial velocity data. By adjusting FOL parameters to account for the propagation environment and regional characteristics of each observation station, the reliability and precision of current velocity data can be improved. This suggests a practical approach to broad-scale quality enhancement of HF-Radar data.

Keywords
HF radar
first order line
FOL
first/second-order boundary
surface currents
drifters
References
1

국립해양조사원 (2022) 해양관측 뉴스레터. 국립해양조사원 11-1192136-000356-08 21 p

2

김재엽, 정다운, 이석, 송규민 (2022) 전파환경에 따른 안테나패턴 측정(APM) 결과가 고주파 해양레이더의 자료 품질에 미치는 영향. Ocean Polar Res 44(4):287-296

10.4217/OPR.2022026
3

김호균, 김정훈, 손영태, 이상호 (2018) 한국연안 고주파 해양레이더망 운영과 활용 개관. 대한원격탐사학회지 34(2): 351-375

4

송규민 (2016) 고주파(HF) 해양레이더 운용에 분배된 국내 주파수 전파 환경 분석. Ocean Polar Res 38(4):325-330

10.4217/OPR.2016.38.4.325
5

이상호, 문홍배, 백혜연, 김창수, 손영태, 권효근, 최병주 (2008) 금강하구 연안역에서 HFR로 측정한 유속의 정확도. 한국해양학회지 바다 13(1):42-55

6

Barrick DE (1971) Theory of HF and VHF propagation across the rough sea. Radio Sci 6(5):527-533

10.1029/RS006i005p00527
7

Barrick DE (1972) Remote sensing of sea state by radar. In Ocean 72-IEEE In ternational Conference on Engineering in the Ocean Environment, Newport, 13-15 Sep 1972

10.1109/OCEANS.1972.1161190
8

Barrick DE (1977) Extraction of wave parameters from measured HF radar sea-echo Doppler spectra. Radio Sci 12(3):415-424

10.1029/RS012i003p00415
9

Barrick DE, Evans MW, Webere BL (1977) Ocean surface currents mapped by radar. Science 198(4313):138-144

10.1126/science.198.4313.13817755343
10

Barrick DE, Lipa BJ (1997) Evolution of bearing determination in HF current mapping radars. Oceanography 10(2):72-75

10.5670/oceanog.1997.27
11

Chapman RD, Shay LK, Graber HC, Edaon JB, Karachintsev A, Trump CL, Ross DB (1997) On the accuracy of HFR surface current measurements: inter-comparisons with shipbased sensors. J Geophys Res 102(C8):18737-18748

10.1029/97JC00049
12

CODAR (2002) Defining First-order region boundaries. Codar Ocean Sensors. http://www.support.codar.com/ Accessed 5 Mar 2002

13

CODAR (2016) SpectraPlotterMap 12 user guide. Codar Ocean Sensors. http://www.support.codar.com/ Accessed 14 Sep 2016

14

Evans C, Roarty H, Smith M, Kerfoot J, Glenn S, Parikh H, Whelan C (2013) Improvement of surface current measurements with spectra reprocessing for 13 MHz SeaSonde systems. In 2013 OCEANS-San Diego IEEE, San Diego, 23-27 Sep 2013

15

Kirincich A (2017) Improved detection of the first-order region for direction-finding HF radars using image processing techniques. J Atmos Ocean Tech 34(8):1679-1691

10.1175/JTECH-D-16-0162.1
16

Kohut J, Glenn S (2003) Improving HF Radar surface current measurements with measured antenna beam patterns. J Atmos Ocean Tech 20(9):1303-1316

10.1175/1520-0426(2003)020<1303:IHRSCM>2.0.CO;2
17

Lai Y, Wang Y, Zhou H (2020) First-order peaks determination for direction-finding high-frequency radar. J Mar Sci Eng 9(1):8. doi:10.3390/jmse9010008

10.3390/jmse9010008
18

Lipa B, Barrick DE (1983) Least squates methods for the extraction of surface currents from CODAR crossed-loop data: application at ARSLOE. IEEE J Oceanic Eng 13(2): 507-513

19

Liu Y, Weisberg RH, Merz CR (2014). Assessment of CODAR SeaSonde and WERA HF radars in mapping surface currents on the West Florida shelf. J Atmos Ocean Tech 31(6):1363-1382

10.1175/JTECH-D-13-00107.1
20

Roarty H, Updyke T, Nazzaro L, Smith M, Glenn S, Schofield O (2024) Real-time quality control for a high frequency radar network. Front Mar Sci 11:1352226. doi:10.3389/fmars.2024.1352226

10.3389/fmars.2024.1352226
21

Yoshikawa Y, Masuda A, Marubayashi K, Ishibashi M, Okuno A (2006) On the accuracy of HF radar measurement in the Tsushima Strait. J Geophys Res 111(C04009). doi: 10.1029/2005JC003232

10.1029/2005JC003232

국문 참고자료의 영문표기 English translation / Romanization of references originally written in Korean

1

KHOA (2022) Oceanographic observation newsletter (2nd quarter 2022). KHOA 11-1192136-000356-08 21 p

2

Kim JY, Jung D, Lee S, Song KM (2022) The Effect of Antenna Pattern Measurement According to Radio Wave Environment on Data Quality of HF Ocean Radar. Ocean Polar Res 44(4):287-296

10.4217/OPR.2022026
3

Kim HK, Kim JH, Son YT, Lee SH (2018) An overview of operations and applications of HF ocean radar networks in the Korean Coast. Korean J Remote Sens 34(2):351-375

4

Song KM (2016) Analysis of radio environments allocated to HF ocean surface radar in Korea. Ocean Polar Res 38(4): 325-330

10.4217/OPR.2016.38.4.325
5

Lee SH, Moon HB, Baek HY, KIM CS, Son YT, Kwon HK, Choi BJ (2008) Accuracy of HF radar-derived surface current data in the coastal waters off the Keum River estuary. J Kor Soc Oceanog 13(1):42-55

Information
  • Publisher :Korea Institute of Ocean Science and Technology
  • Publisher(Ko) :한국해양과학기술원
  • Journal Title :Ocean and Polar Research
  • Journal Title(Ko) :Ocean and Polar Research
  • Volume : 47
  • Pages :1-17
  • Received Date : 2025-02-03
  • Revised Date : 2025-03-25
  • Accepted Date : 2025-03-26
  • Published Date : 2025-05-02
  • DOI :https://doi.org/10.4217/OPR.2025005
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