This communication proposes a gain design method of an α-β filter with linear frequencymodulated (LFM) waveforms to achieve optimal range prediction (tracking) of maneuvering targets in steady-state. First, a steady-state root-mean-square (RMS) prediction error, called an RMS-index, is analytically derived for a constant-acceleration target. Next, a design method of the optimal gains that minim...

A single electro-optical (EO) sensor used in space debris observation provides angle-only information. However, position can be derived using simultaneous optical measurements obtained from two EO sensors located at separate sites, and this is commonly known as triangulation. In paper, we propose a new triangulation algorithm to determine position, its analytical expression of Root-Mean-Square ...

This study investigates the predictions of real contact area for perfectly elastic rough surfaces using a boundary element method (BEM). Sample surface measurements were used in BEM to predict as function load. The normalized by root-mean-square (RMS) slope evaluate if would collapse onto one master curve. If so, this confirm that areas manufactured, measured are directly proportional root mean...

In radar signature analysis, the root mean square (RMS) surface slope is utilized to assess the relative contribution of multiple scattering effects. For an exponentially correlated surface, an effective RMS slope can be determined by truncating the high frequency tail of the roughness spectrum. The choice of the cutoff frequency and the effect on surface scattering simulations are discussed.

PURPOSE To compare visual outcomes and changes in total higher-order aberrations (HOAs) between conventional photorefractive keratectomy (PRK) and custom PRK SETTING: Department of Ophthalmology, Labbafinejad Medical Center, Ophthalmic Research Center, Shahid Beheshti University of Medical Sciences and Negah Eye Center, Tehran, Iran. METHODS This clinical trial comprised eyes having bilateral...

A dual-band vector-sum phase shifter with independent control of the 2.4 and 5 GHz Wi-Fi bands is presented. The network uses band-limited variable gain amplification, a broadband hybrid coupler at input an in-phase recombiner output. circuit prototyped on RF printed board exhibits performance characteristics comparable to state-of-the-art single band shifters. prototype achieved average 2.16 d...

We have achieved high-precision laser beam shaping by using a binary-amplitude spatial light modulator, a digital micromirror device (DMD), followed by an imaging telescope that contains a pinhole low-pass filter (LPF). An error diffusion algorithm was used to design the initial DMD pixel pattern based on the measured input beam profile. This pattern was iteratively refined by simulating the op...

Based on the bio-optical dataset acquired in the Bohai Sea in June, 2005, neural network (NN) model for remote sensing inversion of chlorophyll-a concentration is developed. The three-layer backpropagation NN model employs hyperbolic tangent sigmoid transfer function and 7 Neurons in hidden layer, taking seawater remote sensing reflectance of 443nm, 490nm, 555nm and 670nm as model input. Model ...