AADI RDCP600 Deployment Manual
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Page 30 JANUARY 2010 - TD 220a DEPLOYMENT GUIDE, RDCP6001.5.4 Cell overlap; Considerations and RecommendationsThe user can configure the cells in one column to expandinto adjacent cells. This is called cell overlap. The cells canoverlap as much as 90%.The advantage of using cell overlap is that the distancebetween each cell centre is shorter compared to no overlap,refer to Figure 1-14. Hence, the vertical resolution of thewater column is improved without the need of a smaller cellsize (a smaller cell size increases the noise level).Cell overlap serves as a kind of averaging in the verticaldirection, and may be used to fine-tune cell positions whenworking close to the surface.When cells overlap, one cell includes information fromadjacent cells as well as from its own. However, celloverlap does not introduce new information.Since the RDCP 600 only needs a modest increase in timeto process the additional cells (due to cell overlap, keepingthe same column length), it is recommended to allow somecell overlap as this will improve later processing while stillleaving the opportunity to skip overlapping cells if sodesired later.The contribution from adjacent cells decreases as the distance reaches 50% of the pulse length.At this point the contribution is zero.NOTE! We recommend a 50% cell overlap if space allows it, due to the averaging feature in thevertical direction.At 50% cell overlap and 2 meters cell size, the centre of each cell is only 1m apart.NOTE! When sending data in real-time using PDC-4, the amount of extra data produced whenusing cell overlap (keeping the same column length) can be a problem due to the very slowPDC-4 interface. The extra information can limit the amount of data transferred.Figure 1-14 Cell Overlap |
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