Differences between downward and sideways looking Vectrino vno files?

Up to System integration and telemetry

Differences between downward and sideways looking Vectrino vno files?

Posted by Mike Jesson at December 01. 2017

I've been asked to look into an issue with software I have written to parse vno files. This is working fine with output from downward looking Vectrino, but there are issues with the user's side-looking Vectrino. Looking at the binary file there seems to be additional, random length data between the velocity data header (0x50) and the first measurement data (0x51) (see attachment). The length of the header is reported as 0x15 in both cases. Is this a bug, or is there something I'm missing in the configuration?

One way around this is to check the block id and ignore all blocks after the data header unless they are velocty data blocks - is it safe to do this, or could other data structures still appear?

The second issue is that the side-looking vectrino only gives a single z-velocity (my software is currently taking the mean of the two z-velocities for the downward looking vectrino). Is there a way to distinguish between side- and downward instruments from the configuration?

 

Thanks,

 

Mike

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