Numerical methods for modeling of radar wideband signal scattering by aerial, ground and subsurface objects
In our review the developed electrodynamic numerical methods for modeling of scattering characteristics of complex-shaped electrically large and resonant radar objects are considered. Futures of mentioned numerical algorithms and their advantages in comparison with other well known techniques are discussed. Proposed algorithms allow obtaining frequency responses of air, ground, and subsurface radar objects for given sounding conditions. Particular qualities of object ultrawideband impulse response modeling are also briefly discussed. In conclusion we demonstrate some results of numerical modeling of ultrawideband impulse responses of different air, ground, and subsurface objects in VHF, UHF, and SHF bands. Such results have a wide field of application for solving applied problems at the stage of development of effective wideband radars of different types.
High-Resolution Range Profiles of Artillery Shells in UHF and VHF Bands
Wideband (ultrawideband) radar responses of two type artillery shells with various electrical sizes and shape are investigated. Computer technique based on magnetic field integral equation solving was used for obtaining high-resolution radar range profiles (HRRPs) of considered objects in UHF and VHF bands, and for two sounding signal bandwidth. Obtained results show that the using of sounding signals with 100… 300 MHz bandwidth in counter-battery radars allows effective non-cooperative radar identification of artillery shells and rockets of multiple launch rocket systems (MLRSs) without using a large database of radar profiles for various aspect angles of shells.
A survey of aquaculture production economics and management
Abstract The literature on production economics and management of fish culture has grown as aquaculture has matured as a commercial industry. Salmon, catfish, shrimp and trout are the focus of this literature survey as a reflection of the volume of research that has been completed on these species and their importance in US production and world trade. In addition, a discussion of low resource production systems is included that is dominated by tilapia and carp culture systems. A brief overview of the principles of aquaculture production economics and management is presented followed by a review of economic studies.