A number of mitigation methods are available in the HWA 2.0 [2]. The simplest method of mitigation is to replace the region of interference with zeros (Figure 3-4 - top). However, that has the side effect of creating large sidelobes that might bury weak targets. A better approach is to blank out with a window. A smoothing window is used to zero the samples that have been affected by interference. This leads to lower sidelobes and better detectability of weak targets (Figure 3-4 - middle).

An even better approach would be to perform linear interpolation in the blank region, using the last good ADC sample before interference and the first good ADC sample after the period of interference. Since the strongest reflectors are likely to be closer to the radar and hence have lower frequencies, this approach works well in many cases (Figure 3-4 - bottom).

Figure 3-4 Different Mitigation Approaches

Mitigation is an active area of research and more complex mitigation schemes that are possible than the three we’ve discussed. However, as the mitigation scheme becomes more complex, one has to weigh the amount of MIPs consumed against the benefit gained by the more complex scheme.