User's Manual

MDC-5200/5500 Series Chapter 8 Principal of radar system
0093155002-03 8-5
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Skip target images
False image of a distant target caused by “skip” phenomenon
Depending on weather conditions, skip caused by the temperature inversion layer of air, etc. may
appear. In this case, the radio wave may unusually propagate to distant targets out of the radar range. A
target at more than the maximum range may appear as an image, and may be displayed as a false
image with closer distance than the actual one. This phenomenon is a result of the wide range echo
delay time exceeding the transmission period, and is displayed as echo in the following rotation. If the
range scale is changed and the target range is changed, it can be judged as a false image.
8.3 Radar interference
When the radar with the same frequency band is used nearby, interference noise appears on a display.
Although appearance of interference is not constant, the shape is almost always swirling or radial.
This series of radars features an IR (interference rejection) facility to reduce this interference.