Channel effects include smooth, phase-continuous carrier and signal Doppler shift, range delay
, range attenuation, fading, and noise.
In addition, STK sets up the T400CS so it that can produce exact range delay
, Doppler shift, range attenuation, AWGN (additive white Gaussian noise), and fading for the specified scenario.
Ionosphere correction models are required to correct the time delay or its equivalent range delay introduced by the ionosphere.
An ionosphere model to be used operationally to correct the range delay should have the following main characteristics:
Figure 3 shows a photo of a CVDL-based range delay
unit (RDU) built for the US Army MICOM.
For example, if an airplane flying over a humvee was transmitting signals to the ground, the link would be affected by high Doppler shift rates and varying range delays
that the humvee's receiver would need to track.