Measurement of Target Parameters Using the DSSS Radar

Abstract

Abstract-With the technological growth of broadband wireless technology like CDMA, OFDM and MIMO, a lots of development efforts towards wireless communication system and imaging radar system are well justified. It has been recently shown that multipleinput multiple-output (MIMO) antenna systems have the potential to dramatically improve the performance of communication systems over single antenna systems. Efforts are also being imparted towards a Convergence Technology. The convergence between a communication and radar technology which will result in ITS (Intelligent Transport System) and other applications. This motivates development of the present article. This is an effort in the direction to utilize or converge the communication technologies towards radar and to achieve the interference and clutter free quality remote images of targets.

Neutrinos in the Early Universe, Kalb-Ramond Torsion and Matter-Antimatter Asymmetry

“…Another approach involves an axial vector current [30][31][32][33] instead of J µ . The scenario is based on the well known fact that fermions in curved space-times exhibit a coupling of their spin to the curvature of the background space-time.The Dirac Lagrangian density of a fermion can be re-written as:…”

“…in a standard notation, where e µ a are the vielbeins, Γ µ αβ is the Christoffel connection and Latin (Greek) letters denote tangent space (curved space-time) indices. The space-time curvature background has, therefore, the effect of inducing an "axial" background field B a which can be non-trivial in certain anisotropic space-time geometries, such as Bianchi-type cosmologies or axisymmetric Kerr black holes [30][31][32][33]. For an application to particle-antiparticle asymmetry it is necessary for this axial field B a to be a constant in some local frame.…”

“…T , with g ⋆ the number of degrees of freedom for the (relativistic) neutrino. An excess of particles over antiparticles is predicted only when B 0 > 0, which had to be assumed in the analysis of [30][31][32][33]; we should note, however, that the sign of B 0 and its constancy have not been justified in this phenomenological approach (The above considerations concern the dispersion relations for any fermion, not only neutrinos. However, when one considers matter excitations from the vacuum, as relevant for leptogenesis, we need chiral fermions to get non trivial CPTV asymmetries in populations of particle and antiparticles, because…”

Simulation of Spread Spectrum Radar Using Rake at the Receiver End

“…1 is operational at SMIT using 2.4 GHz radio carrier [12]. The block diagram of such RADAR is shown in Fig.…”

“…The different correlators are time synchronised to extract the valid information out of the different fingers which reach the receiver with some inter-finger delays. The signals out of each correlator are then combined and the combined signal is normalized with a normalization factor to obtain the desired output signal [12,22].…”