Email this article Transmission of telemetry information in a hydroacoustic communication channels
- Authors: Filippov B.I.1
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Affiliations:
- Novosibirsk State Technical University
- Issue: Vol 23, No 9 (2017)
- Pages: 658-663
- Section: Digital processing of signals and images
- Published: 15.09.2017
- URL: https://journals.eco-vector.com/1684-6400/article/view/703592
- ID: 703592
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Abstract
Telemetry information transfer in hydroacoustic channel considered. The main task is to choose a method that provides digital information transfer with the highest speed and defined noise immunity and acceptable energy costs. Use directional antennas in hydroacoustic channel to reduce noise impact and improve energy characteristics of equipment. But directional hydroacoustic antennas has phase characteristics with hight irregularity and with points of discontinuity. It is a barrier for digital information transfer through hydroacoustic channel with high speed using short duration signal and applying adaptive harmonic correctors. Comparison of energy spent on transmission of same amount of information with consequent and parallel methods shows that energy efficiency using consecutive data transmission method with speed V is at least 40 % higher than using highspeed parallel method. Transmission of digital information from hydroacoustic underwater station to ship receiving-processing complex carry out through the subsystem of control channel. To increase the level of noise immunity of digital information transmission in ship receiving-processing complex, convolutional coding should be used in conjunction with a threshold decoder correcting errors multistage. Average transfer rate vср by using the convolutional code (R = 7/8) vср ≈ 0,85v.
Transfer information from hydroacoustic underwater station to ship receiving-processing complex in channel "hydroacoustic underwater station — popup modules of satellite communication system" recommended with blocks with link acknowledgment on the reverse channel. On popup modules of satellite communication system, in order to save computing power and hardware is offered to perform one or two error correction iteration. Other errors need to request from hydroacoustic underwater station through the feedback channel, estimation of encoding error probability after two iterations equals to Pä2 ≈ 1,2•10–5 and it considered to be sufficient.
About the authors
B. I. Filippov
Novosibirsk State Technical University
Author for correspondence.
Email: filippov-boris@rambler.ru
Ph. D., Associate Professor
Russian Federation, NovosibirskReferences
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