The filter inside the GN3S is quite narrow, but in clear sky conditions, Giove-A E1C channel is easily detectable (thanks to my friend Luca for the images).
The frequency search space is ±5 kHz, the code is 8 ms long, thus about 130941 samples.
Fig. 1: The search space of Giove-A E1C
The typical BOC(1,1) correlation function shape is zoomed below:
Fig. 2: The correlation function zoomed around the peak
A certain smoothing of the peaks can be noted, certainly due to the filter characteristics mentioned above.