http://nopr.niscpr.res.in/handle/123456789/35409 2026-10-09T07:05:05Z http://nopr.niscpr.res.in/handle/123456789/35489 Title: Evaluation of capacitance and charge distribution of cylinder of finite length with top and bottom cover plates Authors: Das, B N; Chakrabarty, S B Abstract: A method of finding the capacitance and the charge distribution of isolated cylinder in the presence of top and bottom cover plates is described. Integral equation relating the charge and potential appears as a sum of three integrals. The unknown charge in these three integral equations is found by applying the moment method formulation which uses pulse functions as basis functions and point matching for testing. The matrix so obtained is inverted through its partitioning into 3 x 3 submatrices. The numerical data on capacitance and charge distribution are presented. Page(s): 112-115 1997-04-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/35488 Title: A study on GPS PDOP and its impact on position error Authors: Banerjee, P; Bose, Anindya; Mathur, B S Abstract: It is well established that 3-dimensional position error in position fix through GPS network should increase with PDOP value provided the range error estimates remain constant. To study this aspect an elaborate experimental observation was carried out for one complete year. These data have been systematically analyzed. It has been seen that for maximum percentage of time optimum PDOP values lie between 2 and 4. Study on the variations of 3-dimensional position errors on PDOP reveals that position errors increase proportionately up to the value of 6. Afterwards the change of position errors with PDOP is almost random in nature. Possibly beyond this value of PDOP, the position errors are governed by some other factors. Page(s): 107-111 1997-04-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/35487 Title: Some observed characteristics of daily minimum of an LF signal Authors: De, B K; Sarkar, S K Abstract: The daily minimum (DM) of amplitude of a long distance 40 kHz radio signal propagated over a low latitude path shown seasonal variation in its time of occurrence and also in its magnitude. Later occurrence of minimum is observed in winter compared to other seasons. The level of the minimum is lowest in monsoon and highest in winter. The times of occurrence of DM are well correlated with meteorological parameters. During most of the geomagnetically active days DMs disappear. Page(s): 99-106 1997-04-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/35486 Title: Statistical investigations of gigahertz scintillations due to ionospheric irregularities in the Indian zone Authors: Banerjee, P K; Bhattacharya, S Abstract: Some useful results of statistical investigations of ionospheric scintillations at gigahertz frequencies are reported in this paper. Temporal power spectral densities for weal an strong scintillations at both C and L bands, 50% decorrelation times and ground decorrelation scales are also presented and discussed. Page(s): 93-98 1997-04-01T00:00:00Z