On the Achievable Accuracy for Estimating the Ocean Surface Roughness using Multi-GPS Bistatic Radar
نویسندگان
چکیده
The signals from the Global Positioning System (GPS) reflected from the ocean surface have been considered for bistatic GPS remote sensing to estimate parameters including wind speed and height and roughness of the ocean surface. A variety of models, methods, and experimental campaigns have verified the level of viability and reliability of the bistatic GPS radars. In this article, we analyse the ocean roughness data inherent in the reflected GPS signals in terms of the ocean state and the number of visible satellites and the altitude of the receiver. This analysis provides estimates of the achievable performance in estimation of surface roughness. The error analysis considers different surface wind speeds and the impact of surface roughness on the state estimation error. Real position data of observed satellites are used to estimate the achievable performance in a certain area over 24 hours. The reliability of the results for airborne and spaceborne receivers is discussed.
منابع مشابه
A Bistatic HF Radar for Current Mapping and Robust Ship Tracking
A bistatic High Frequency (HF, or 3-30 megahertz band) radar has been developed for dual-use application to ocean current mapping and ship vector tracking. The radar can be deployed in a multi-frequency version, allowing it to sample ocean currents at different depths between 20 centimeters and 3 meters, and thus map ocean current vertical shear. The multi-frequency feature allows for more robu...
متن کاملGPS Signal Scattering from Sea Surface: Wind Speed Retrieval Using Experimental Data and Theoretical Model
Global Positioning System (GPS) signals reflected from applications. Recently, the sensitivity of this signal to the ocean surface have potential use for various remote propagation effects was found to be useful for various sensing purposes. Some possibilities are measurements of environmental remote sensing techniques. For example, surface roughness characteristics from which wave ionospheric ...
متن کاملSeasonal Polarimetric Measurements of Soil Moisture Using Tower-Based GPS Bistatic Radar
The results of GPS L-band (L1, = 19 cm) surface reflection measurements observed using multiple polarizations and receiving antenna gains are described. The measurements were performed using the 300-m tall ETL Boulder Atmospheric Observatory (BAO) tower during summer through fall of 2002. In this experiment the first seasonal measurements of bare soil moisture from a stationary location using b...
متن کاملMapping surface roughness and soil moisture using multi-angle radar imagery without ancillary data
The Integral Equation Model (IEM) is the most widely-used, physically based radar backscatter model for sparsely vegetated landscapes. In general, IEM quantifies the magnitude of backscattering as a function of moisture content and surface roughness, which are unknown, and the known radar configurations. Estimating surface roughness or soil moisture by solving the IEM with two unknowns is a cla...
متن کاملScattering of GPS signals from the ocean with wind remote sensing application
A theoretical model that describes the power of a scattered Global Positioning System (GPS) signal as a function of geometrical and environmental parameters has been developed. This model is based on a bistatic radar equation derived using the geometric optics limit of the Kirchhoff approximation. The waveform (i.e., the time-delayed power obtained in the delay-mapping technique) depends on a w...
متن کامل