Transmitter’s Internal Noise Performance as Limiting Factor in High-Frequency Over-the-Horizon Radars

In this paper an analysis of effects originating from a transmitter of one High-Frequency Over-the-Horizon radar (HF-OTHR) on its own range performance is presented. The model used for this analysis is based on measured values of system parameters, which allows obtaining realistic results in simulation analysis. This model is described and explained, along with the format of observed data and simulation results in the meaning of impact of transmitter's parameters on system's overall performance. The influence of these critical parameters, namely the output power level and the level of the internal noise within the power amplifier, to the range estimation of HF-OTH radars is quantified for all seasons over the year, in general and under the terms of specific geographical location.