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Digital beam forming in adaptive array system can be achieved by down converting frequency of received signal RF to IF-a low frequency that can be sampled and processed in real time by the digital signal processors. For this we need channel devices like low noise amplifier, down converter and band pass filter for every array elements i.e. for 16 times16 array antenna we need 16 times 16 channel devices...
Polarimetric SAR provides a substantial source of information over conventional imaging radars. Fully polarimetric PALSAR data has been used for land cover classification. Co and Cross Polarization signatures for different classes are obtained in linear (h,v) and circular (l.r) basis. Different combinations from both basis have been extracted for the (principal component analysis) PCA. Supervised...
A 3.1 to 3.5 GHz monolithic GaAs two-bit phase shifter (90deg & 180deg) have designed and realized. The small signal simulated and measured results have presented. A 3.1 to 3.5 GHz phase shifter has designed using switch-network phase shifter topology. The low pass and high pass filter have the most commonly used networks in switch network phase shifter. By switching between the phase shifting...
In this paper, we present the bandwidth enhancement of microstrip antenna using microstripline feed, suspended and gap-coupled configuration. First, the bandwidth of suspended microstrip antenna (SRMSA) is enhanced by gap coupling the parasitic patch to the radiating edge of fed patch of the antenna. Using this technique, an optimum bandwidth of 22.24% is obtained. Later, two parasitic patches are...
For pt. I see ibid., p.614-17, (2008). Monostatic co- & cross-linearly polarized RCS of a perfectly conducting ballistic missile along a preloaded nominal trajectory are evaluated from a particular radar location. Importance of aspect & polarization dependent co- & cross- polarized RCS of the modeled missile along its preloaded trajectory & the effects of its variation on tracking...
We have designed the unusual types of feed antenna for parabolic dish that is used for both reception and transmission purpose. This different frequency band performance having horn and helical feed, works for the parabolic reflector antenna. We have worked on frequency band between 4.8 GHz to 5.9 GHz for horn type of feed. Here function of the horn is to produce uniform phase front with a larger...
A theoretical technique is presented for determination of monostatic co- & cross-linearly polarized radar cross section of a modeled ballistic missile at each point on its nominal trajectory. The modeled missile is considered perfectly conducting. Techniques to determine co- &cross- polarized RCS of the missile using relative phase & random phase methods from the aspect and polarization...
Summary form only given. There has been a rapid technological growth in the field of antennas for space-borne, air-borne and ground based microwave sensors of passive as well as active types. The performance of the sensors largely depend on the radiation characteristics of the multifunctional antenna system. The development of these antenna systems pose a very challenging task in achieving the stringent...
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