CHAPTER 7
Statistical Signal Model
In applications such as OTH radar, it is useful to have an accurate model for the space-time complex (amplitude and phase) fading of HF signals reflected from different ionospheric regions or layers over time intervals that exceed a few seconds. For reasons mentioned in the previous chapter, the deterministic wave-interference characterization of mode fine structure becomes inconvenient and more difficult to interpret intuitively when the observation interval is lengthened from a few seconds to a few minutes. If the complex fading process can be treated as a stationary random process over a time interval of a ...
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