  Radio Frequency Interference (RFI) is emitted from various sources,
terrestrial or orbital, and create a nuisance for ground-based 21cm
experiments. In particular, single-dish 21cm intensity mapping experiments will
be highly susceptible to contamination from these sources due to its wide
primary beam and sensitivity. This work aims to simulate the contamination
effects emitted from orbital sources in the Radio Navigational Satellite System
within the 1100-1350 MHz frequency. This simulation can be split into two
parts: (I) satellite positioning, emission power, and beam response on the
telescope and (II) fitting of the satellite signal to data in order to improve
the original model. We use previously observed single dish MeerKAT L-band data
which needs to be specially calibrated to include data contaminated by
satellite-based RFI. We find that due to non-linearity effects, it becomes
non-trivial to fit the satellite power. However, when masking regions where
this non-linearity is problematic, we can recreate the satellite contamination
with high accuracy around its peak frequencies. The simulation can predict
satellite movements and signal for past and future observations, which can help
in RFI avoidance and testing novel cleaning methods. The predicted signal from
simulations sits below the noise in the target cosmology window for the L-band
(970 - 1015 MHz) making it difficult to confirm any out-of-band emission from
satellites. However, a power spectrum analysis shows that such signal can still
contaminate the 21cm power spectrum at these frequencies. In our simulations,
this contamination overwhelms the auto-power spectrum but still allows for a
clean detection of the signal in cross-correlations with mild foreground
cleaning. Whether such contamination does exist one will require further
characterization of the satellite signals far away from their peak frequencies.
