Remote Sensing With TDMF Radar: Some Preliminary Results

Abstract

Abstract-HF radar in ocean remote sensing makes use of electromagnetic waves of 10 m to 100 m wavelength from the rough sea surface to measure surface current and ocean wave parameter. Recently, a new time division multiple frequency HF radar system called OSMAR2009 has been developed by the Wuhan University. One main advantage of the system is that it is of great help in extracting current parameters and significant wave height. A further advantage is the ability to avoid interference. In addition, this technique offers the opportunity to measure the current shear. These advantages are gained by transmitting time division multiple frequency chirp instead of one frequency chirp. This paper introduces the technical design and the advantage of OSMAR2009 and describes the remote sensing experiment implemented in East China Sea during 2009, followed by the field results and the brief analysis of such results.

Multi‐frequency high frequency surface wave radar based on phase offset

“…During recent years, multi‐frequency technique has been applied to HFSWR. The multi‐frequency HFSWR (MHFSWR) measures surface currents at different effective depths [6–8]. It can obtain the Doppler spectrum of the backscatter signals at different sea states which is useful for robust wave measurement [9–11].…”

“…For a MHFSWR working in TDMF mode, the sweep period or the coherent integration time (CIT) is divided into multiple subintervals [8, 21]. The signal on each frequency is transmitted and received in one subinterval.…”

A High Resolution Doa Estimating Method Without Estimating the Number of Sources

“…In this paper, the measured data comes from the HF ground wave radar [11,23,24] experiments by Wuhan University. The receiving array consists of eight sensors, which are uniformly spaced in two rows.…”