Several peaks may be seen in the spectrum view during saturation even if the interfering signal is a narrow-band pulse. Figure 1 shows an example of the spectrum view plot taken from a PolaRx5 near a DME beacon. Although the DME beacon only transmitted a narrow-band pulse centered at 1197MHz, several other peaks can be seen across the L5 band. The narrow and wide-band mitigation filters (AIM+) were disabled on this receiver when the capture was taken. These peaks are the result of non-linear operation in the receiver's front-end.
Saturation of the front-end can be confirmed using the raw samples tab of the spectrum analyzer view. During saturation the raw samples will hit the lower and upper limits of -128 and 127 respectively, as seen below in Figure 2.
Figure 2, Raw Samples During Saturation
摘錄自:
https://customersupport.septentrio.com/s/article/Front-end-Saturation-Caused-by-Interference |
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