Jagathy Raj, V P; Anantha Narayanan, S; Subash Subramoniam, S; Sham Kumar, S(IEEE, November 18, 2009)
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Abstract:
The towed array electronics is essentially a multichannel real time data
acquisition system. The major challenges involved in it are the simultaneous
acquisition of data from multiple channels, telemetry of the data over tow cable
(several kilometres in some systems) and synchronization with the onboard receiver
for accurate reconstruction. A serial protocol is best suited to transmit the data to
onboard electronics since number of wires inside the tow cable is limited. The best
transmission medium for data over large distances is the optical fibre. In this a two
step approach towards the realization of a reliable telemetry scheme for the sensor
data using standard protocols is described. The two schemes are discussed in this
paper. The first scheme is for conversion of parallel, time-multiplexed multi-sensor
data to Ethernet. Existing towed arrays can be upgraded to ethernet using this
scheme. Here the last lap of the transmission is by Ethernet over Fibre. For the next
generation of towed arrays it is required to digitize and convert the data to ethernet
close to the sensor. This is the second scheme. At the heart of this design is the
Analog-to-Ethernet node. In addition to a more reliable interface, this helps in easier
fault detection and firmware updates in the field for the towed arrays. The design
challenges and considerations for incorporating a network of embedded devices
within the array are highlighted
Description:
Ocean Electronics (SYMPOL), 2009 International Symposium on
Jagathy Raj, V P; Anantha Narayanan, S; Subash Subramoniam, S; Resmi, M G(IEEE, October 23, 2013)
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Abstract:
The Towed Array electronics is a multi-channel simultaneous real time
high speed data acquisition system. Since its assembly is highly manpower
intensive, the costs of arrays are prohibitive and therefore any attempt to reduce the
manufacturing, assembly, testing and maintenance costs is a welcome proposition.
The Network Based Towed Array is an innovative concept and its implementation
has remarkably simplified the fabrication, assembly and testing and revolutionised
the Towed Array scenario. The focus of this paper is to give a good insight into the
Reliability aspects of Network Based Towed Array. A case study of the comparison
between the conventional array and the network based towed array is also dealt with