Koden MDC-2240, Operation Manual

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MDC-2200/2500 Series Chapter 6 Principle of radar system
0093125002-02 6-5
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False image of a distant target caused by “skip” phenomenon
Depending on a weather conditions, Skip appear caused by the temperature inversion layer of air, etc.
In this case, the unusual propagation of the radio wave may reach 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 closer than an actual distance. This phenomenon is a result of the long range echo delay
time exceeds the transmission period, and is displayed as the echo in the following rotation. If the
range scale is changed and the target range changes, it can be judged as a false image.
6.3 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 device features an interference rejection facility to reduce interference.