FDR Adjustment for Achieving Desired Minimum Distance of Marine ESIM from the Shore

Abstract

Determining and observing the minimum allowable distance of the marine earth station in motion (M-ESIM) from the shore prevents its destructive interference on the co-frequency shore fixed station. These earth stations are providing broadband Fixed Satellite Services (FSS). This paper studies the parameters involved in the minimum allowable distance of the ship from the shore by simulating the interference from an M-ESIM on a shore fixed station. This distance is determined versus the latitude, carrier frequency and the annual number of crossings ships along the shore. The results show that with decreasing the carrier frequency, decreasing latitude or increasing the number of annual passing vessels, this minimum distance increases. A solution to eliminate these effects and keep constant the minimum distance is shifting the transmitter frequency band. This frequency shift increases the frequency dependent rejection (FDR). In this paper, values of FDR are obtained separately versus three variables of latitude, carrier frequency, and the number of passing ships so that the minimum allowable distance of the M-ESIM from the shore will remain a constant value. The minimum distance of 100, 105 and 110 Km is evaluated in this paper. In this way, the M-ESIM can be close to the shore as near as desired distance using the FDR adjustment.