3.3 Frequency Management
The performance of skywave OTH radar systems is strongly influenced by the choice of operating frequency. The optimum choice of carrier frequency for a particular mission type and surveillance region location depends strongly on the prevailing HF signal-plus-noise environment and ionospheric propagation conditions. Specifically, deviations from the optimum carrier frequency in the order of hundreds of kilohertz can significantly affect the quality of skywave propagation (SNR and/or SCR). On the other hand, differences of a few kilohertz can substantially change the level of interference received from other narrowband ...
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