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Validation of Sensing Ocean Surface Currents Using Multi-Frequency HF Radar Based on a Circular Receiving Array
- Source :
- Remote Sensing, Vol 10, Iss 2, p 184 (2018), Remote Sensing; Volume 10; Issue 2; Pages: 184
- Publication Year :
- 2018
- Publisher :
- MDPI AG, 2018.
-
Abstract
- To reduce the floor space of receiving antenna arrays, the Radio Ocean Remote SEnsing (RORSE) laboratory of Wuhan University developed a circular receiving array for a multi-frequency high frequency (MHF) radar system in 2014, consisting of seven uniformly spaced antenna elements positioned on a circle with a diameter of 5 m. The new system, which is abbreviated MHF-C radar, adopts frequency modulated interrupted continuous wave (FMICW) chirps and is capable of simultaneously operating at a maximum of four frequencies in the band of 7.5–25 MHz, and providing current, wave and wind maps every ten minutes. The phase direction-finding method is utilized to estimate the directions of the current signals, and array phase uncertainties are also taken into consideration in the signal model. This paper introduces the system in detail and investigates the performance of current measurements using MHF-C radars installed at Shengshan and Zhujiajian along the coast of the East China Sea. Radial current measurements derived from 8.27 MHz and 19.20 MHz at the same range are compared. Observations and comparisons between MHF-C radars and acoustic Doppler current profilers (ADCPs) are also presented in this paper. The results preliminarily demonstrate that the MHF-C radar system is capable of maintaining the same performance for current measurements whenever it steers to any other azimuth in the coverage and has a good ability to measure currents.
- Subjects :
- 010504 meteorology & atmospheric sciences
circular receiving array
Acoustics
Science
HF radar
multi-frequency
currents
0211 other engineering and technologies
Phase (waves)
02 engineering and technology
01 natural sciences
Signal
law.invention
symbols.namesake
law
Radar
021101 geological & geomatics engineering
0105 earth and related environmental sciences
Azimuth
symbols
General Earth and Planetary Sciences
Continuous wave
Antenna (radio)
Current (fluid)
Doppler effect
Geology
Subjects
Details
- Language :
- English
- ISSN :
- 20724292
- Volume :
- 10
- Issue :
- 2
- Database :
- OpenAIRE
- Journal :
- Remote Sensing
- Accession number :
- edsair.doi.dedup.....7d44f549ff99f0a7c1b6945f10b78f5e