Furuno FAR-2107 Series Service Manual page 449

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Overview of EAV-1 and 2 processing

In EAV-1 and 2, correlation processing is performed by making comparisons between

the current screen and last screen. EAV-1 is for the past two correlation processing

and EAV-2 is for the past three correlation processing.

In this processing, the EAV output level is gradually raised if signals are detected in

consecutive scans while the level is gradually reduced if signals are intermittent

among scans. In this processing, outputs become weaker than input signals for a

high-speed boat. This tendency is particularly apparent in EAV-2.

Fig. 7.3.13 Examples of EAV pictures

7.3 Processor Unit (RPU-013)