Is there an angular rate limit for the accuracy spec?
The effect of increased angular motion is to increase the standard deviation of each individual ping rather than effecting long term accuracy. Our broadband systems have extremely good performance on single ping precision due to our patented broadband processing and therefore this is not typically a concern. In addition to the above, you should note that considerable levels of roll or pitch (>20 degrees) may result in the decorrelation of some pings. As we use narrow acoustic beams to achieve the highest possible accuracy, the transmitted signal may not be received back at the transducer if the angular motion is high (roll or pitch rate) combined with high roll / pitch angles. This effectively would reduce the number of bottom tracking pings that would be reported from the DVL. We use the BC command to set a correlation threshold in our DVL. We set a default (recommended by RDI), however this threshold may be overridden (reduced) if you expect increased motion.
