Ground-based synthetic aperture radar (GB-SAR) has become an important technique for remote sensing deformation monitoring. However, most of the existing GB-SAR systems realize synthetic aperture by exploiting two closely spaced horn antennas to move along a linear rail. In order to obtain higher data acquisition efficiency and a wider view angle, we introduce arc antenna array technology into ...

The Space Dynamics Laboratory has used internal funds to develop a prototype low-cost two-axis fine steering mirror (FSM) for space-based and airborne applications. The FSM has a lightweight 75 mm-by150-mm high-reflectance mirror, high angular deflection capability for along-track ground motion compensation and cross-track pointing, and a 70-Hertz bandwidth for small amplitudes to help cancel u...

Despite the importance of cryptic and conspicuous coloration in pelagic ecosystems, few researchers have investigated the optimal reflectance spectra for either trait. In this study, the underwater radiance distribution in tropical oceanic water was modelled using measured inherent optical properties and radiative transfer calculations. The modelled light field was then used to predict the refl...

With the advent of GPS for control surveying, a problem has arisen. Many existing control stations established by conventional methods (i.e. first order triangulation stations) are in locations not suitable for direct occupation by GPS equipment. Eccentric observations are often possible, with the eccentric station located up to 100 m away. In order to connect the eccentric station to the main ...

This paper proposes a spiking neural network (SNN) of the mammalian auditory midbrain to achieve binaural multiple sound source localisation. The network is inspired by neurophysiological studies on the organisation of binaural processing in the medial superior olive (MSO), lateral superior olive (LSO) and the inferior colliculus (IC) to achieve a sharp azimuthal localisation of sound sources o...

The sewage diffusion effect under deep water was carried out between different diffuser design parameters based on the hydraulic model test. According to test of length, riser spacing, number, nozzle horizontal azimuth angle and jet angle, specific need be determined comprehensively considering surface field, degree, project cost, etc. We used a coastal marine disposal in China as an example. a...

Antarctic Submillimeter Telescope and Remote Observatory ~AST/RO!, a 1.7 m diameter telescope for astronomy and aeronomy studies at wavelengths between 200 and 3000 mm, was installed at the South Pole during the 1994–95 Austral summer. The optical design is Gregorian, offset in both azimuth and elevation, with the exit pupil at the chopping tertiary mirror: this arrangement provides for consist...

Synthetic Aperture Radar (SAR) ship detection is an important maritime application. However, azimuth ambiguities caused by the finite sampling of the Doppler spectrum are often visible in SAR images and are always mistaken as ships by classic detection techniques, like the Constant False Alarm Rate (CFAR). It is known that radar targets and azimuth ambiguities have different characteristics in ...