National Informatics Corporation (Iran)

Seeker is widely used in literature of radar. The goal of this paper is designing a dual mode monopulse antenna for seeker. The dual mode technology is widely used in passive and active seekers. In this technology, antenna radiation and infrared sensor are used for target detection. Thus, the angle of target in azimuth plane is precisely detected. In this paper, a dual mode slot array antenna in X-band for an active seeker is designed and optimized. The Main lobe of the antenna is only in azimuth plane and does not shift with frequency variation. The gain of the antenna is suggested to be 23dBi for the best detection. We select the type of the antenna due to the available results in the literature. Then, designing of the antenna is done step by step. Simulation and optimization of antenna are performed by CST studio suite software.

Router processing power in VSAT networks is a serious problem due to the huge amount of packets transferring between satellite links and terrestrial links. In this paper, we model power of core routers which are using OSPF and EIGRP protocols. The model can accurately predict the power consumption of the routers with a significant speedup. Also we determine the total number of routers required to support thousands of servers in the mentioned network. Simulations done with NS2 in a wide range of network configurations to support the proposed model. Results obtained from the simulations are in agreement with those obtained by the model.