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Baseline » Issue 15

Ocean Science Case Study: Shallow water performance characterisation of BlueComm 200 pollution from the full Moon and Toulon just a few miles away, were observable factors that affected range performance. Testing began by manoeuvring Vortex to the limits of BlueComm’s ability to characterise the working beam shape. This can be seen in Figure 1 (right). A video range of 88 metres was achieved while the connection was capable of lower data rates up to 99 metres. The beam shape shows excellent omni-directional coverage with the maximum inline video range only reducing by 20% to 70 metres at the 90 degree point. Further testing showed the pair of BlueComms could reliably communicate with each other well beyond 90 degrees.

BlueComm200 Range Performance Clear Shallow water (2.8 metres)

Absolute Max Measured Range (IP Ping drops out)

ROV command and control The second phase of testing moved Vortex’s command and control over to the BlueComm link. For this testing, Vortex was

Predicted Maximum IP Ping Range Edge of Maximum Data Rate IP Camera Streaming 1 Mbps Ship

fitted with an additional BlueComm white light emitter. This emitter is designed to provide lighting for the camera as conventional vehicle lighting can interfere with BlueComm’s sensitive receivers. The white emitter pulses in synchronisation with the transmissions so as not to cause any interference. Vortex was successfully piloted remotely using the BlueComm for over 45 minutes. Meanwhile increasingly strenuous data transfer tests took place including HD video at 12.5 Mbps transfer speed. The 12.5 Mbps link showed a reduced maximum range of only 4% over the 2.5 Mbps link. The remote control of Vortex showed as the link speed decreased with range, a way to prioritise data such as positioning command and control over less important data is needed. However, there are already Ethernet based standards in place such as QoS (Quality of Service) which can be

Deploying Vortex and its surface WiFi link (yellow float on deck) from the stern of L’Europe for an initial daylight test run.

Profile for Sonardyne International Ltd

Baseline issue 15  

Baseline is Sonardyne’s customer magazine aimed at bringing you the stories and the ideas surrounding our latest product developments. Each...

Baseline issue 15  

Baseline is Sonardyne’s customer magazine aimed at bringing you the stories and the ideas surrounding our latest product developments. Each...