Abstract An antenna of phased array radar (PAR) consists of a large number of individual radiating elements and steers its electromagnetic wave direction by shifting wave phases of these elements. Failed elements have to be detected, diagnosed, localized and replaced at scheduled times to hold a required performance of a radar system. However, the maintenance of an antenna should not be made so...

This paper presents a solution procedure of search parameter optimization for minimum load ensuring desired oneoff and cumulative probabilities of detection in a multifunction phased array radar. The key approach is to convert this nonlinear optimization on four search parameters into a scalar optimization on signal-to-noise ratio by a semi-analytic process based on subproblem decomposition. Th...

The capability of embedded piezoelectric wafer active sensors (PWAS) to perform in-situ nondestructive evaluation (NDE) is explored. Laboratory tests are used to prove that PWAS can satisfactorily perform Lamb wave transmission and reception. Subsequently, crack detection in an aircraft panel with the pulseecho method is illustrated. For large area scanning, a PWAS phased array is used to creat...

The objectives of my proposal are to calibrate and validate the polarimetric data acquired by ALOS (Advanced land observing satellite)/PALSAR (Phased array type L-band synthetic aperture radar). In this report, we show the polarimetric calibration parameter of PALSAR derived by Quegan method and Amazon data. Moreover, we confirm the accuracy of Faraday rotation angle derived from PALSAR data as...

Abstract Aiming at the problem of resource allocation in multi-task scheduling phased array fire control radar, this paper proposes an adaptive algorithm based on comprehensive priority, that is, shooting advantage degree radar to different targets is calculated by using Analytic Hierarchy Process, and then combined with priority work mode task deadline carry out planning task. In performance e...

This paper considers the problem of multi-step scheduling the measurement of several Gauss-Markov systems. Such a problem occurs, for example, in the allocation of the time of a single beam phased-array radar system among several targets. The problem is put into a mathematical framework and is solved for the case of two one-dimensional systems for which the cost function is the sum of the varia...

The capability of embedded piezoelectric wafer active sensors (PWAS) to perform in-situ ultrasonic nondestructive evaluation (NDE) is explored. Laboratory tests are used to prove that PWAS can satisfactorily perform Lamb wave transmission and reception. Subsequently, pulse-echo method for crack detection in an aircraft panel is illustrated. For large area scanning, a PWAS phased array is used t...

In this lecture, we provide an overview of some recent algorithms for radar waveform design. We first illustrate the concept of matched illumination for optimized target detection and identification. This theory derives the optimized transmission signal and the corresponding receiver response which maximizes the Signal to Noise Ratio (SNR). The second part of the lecture is focused on waveform ...