High-frequency (HF) radars are routinely used for remotely sensing ocean surface currents. However, the performance of the most widely used direction-finding HF radar is degraded due to the effect of the inevitable deviations of actual antenna pattern on the direction of arrival (DOA) estimation. In this paper, we quantify the DOA estimation error resulting from the deviation of the actual ante...

An attempt has been made to identify the main synoptic features, which are responsible for onset of southwest monsoon over two met sub divisions east and west Rajasthan period 1971-2004 based on modern observational technology developed forecasting technique in field short-range prediction surges. The low pressure systems (LPS) originate Arabian Sea, especially formation MTC indicates a good si...

By using products of the cloud model, National Centers for Environmental Prediction (NCEP) Final Operational Global Analysis (FNL) reanalysis data, and Doppler weather radar mesoscale characteristics, microphysical structure, mechanism two hail systems which occurred successively within 24 h in southeastern Yunnan have been analyzed. The results show that under influence southwest jets front so...

An “acoustic vector sensor” (also known as a “vector hydrophone” in underwater or sea-surface applications) is composed of three orthogonally oriented uni-axial particle-velocity sensors, plus a “pressure-sensor” (i.e., a microphone or a hydrophone)—all collocated in a point-like spatial geometry. (This collocated setup is versatile for direction finding, because its azimuth-elevation spatial r...

Direction finding is an important issue for bistatic MIMO radar. A two-dimensional direction finding method with automatic pairing is developed. In the presented method, the property of the kronecker product is first utilized to reformulate the cost function in the quadratic form. Then, by constructing the orthogonality constraint of the target DOA to the quadratic form, all target DODs can be ...

1 College of Resources and Environment; Southwest University; Chongqing 400715; China; [email protected] (M.M.); [email protected] (T.S.); [email protected] (H.D.) 2 School of Environment, Jinan University, Guangzhou 510632, China 3 Chongqing Key Laboratory of Agricultural Resources and Environment, Chongqing 400715, China 4 Research Center of Bioenergy and Bioremediation, Southwest University,...

Citation: Laran S, Authier M, Van Canneyt O, Dorémus G, Watremez P and Ridoux V (2017) A Comprehensive Survey of Pelagic Megafauna: Their Distribution, Densities, and Taxonomic Richness in the Tropical Southwest Indian Ocean. Front. Mar. Sci. 4:139. doi: 10.3389/fmars.2017.00139 A Comprehensive Survey of Pelagic Megafauna: Their Distribution, Densities, and Taxonomic Richness in the Tropical So...

In October 2001, an outbreak of febrile illness began in the southwest islands group of the Republic of Palau. Through October 2003, a total of 15 southwest islanders experienced fever >39.5 degrees C and abdominal distress, both lasting >7 days. Orientia tsutsugamushi, the agent of scrub typhus, was subsequently identified as the cause.