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Download PDF by Laurie Tetley I.Eng F.I.E.I.E., David Calcutt: Electronic Navigation Systems

By Laurie Tetley I.Eng F.I.E.I.E., David Calcutt

ISBN-10: 0750651385

ISBN-13: 9780750651387

Maritime navigation has quickly built because the book of the final variation of the name with tools of worldwide place solving for delivery changing into standardized. As within the past variations, this variation will offer a valid foundation for the certainty of contemporary navigation platforms and brings the coed or specialist updated with the most recent advancements in expertise and the transforming into standardization of maritime navigation techniques.Developed with shut scrutiny from the U.S. service provider Marine Academy and the main maritime navigation centres within the united kingdom, out-dated concepts were changed via an improved part at the now ordinary Navstar GPS structures and the built-in Nav. furthermore, a brand new bankruptcy at the software of digital charts can be integrated, in addition to difficulties on the finish of every bankruptcy with labored solutions.Thoroughly revised and up-dated to comply to stricter education standards mandated through the STCW-95 amendments.Expanded part on Navstar GPS structures, the now typical international place solving technique.Up-dated and elevated part on built-in navigation.

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The display circuit consists of three digital counters that are clocked from the clock oscillator circuit. Oscillator clock pulses are initiated by the system trigger at the instant of transmission. The first nine pulses are counted by the lowest order decade counter which registers 1–9 on the display least significant figure (LSF) element. The next clock pulse produces a 0 on the LSF display and clocks the second decade counter by one, producing a 1 in the centre of the display. This action continues, and if no echo is received, the full count of 999 is recorded when an output pulse from the counting circuit is fed back to stop the clock.

Transducers are effectively the antennas of sonar systems. They transmit and receive the acoustic energy. There are two main types of transducer in use; magnetostrictive and electrostrictive. Magnetostrictive transducers are large and heavy and tend to be used only on large vessels. Electrostrictive transducers are lighter and often used in speed logging systems and on smaller craft. Low frequencies are often used in deep sounding systems typically in the range 10–100 kHz. The depth below the keel is related to the time taken for the acoustic wave to travel to the ocean floor and return.

The steady ambient noise caused by natural phenomena. Variable noise caused by the movement of shipping and the scattering of one’s own transmitted signal (reverberation). 4 shows that the amplitude of the ambient noise remains constant as range increases, whereas both the echo amplitude and the level of reverberation noise decrease linearly with range. Because of beam spreading, scattering of the signal increases and reverberation noise amplitude falls more slowly than the echo signal amplitude.

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Electronic Navigation Systems by Laurie Tetley I.Eng F.I.E.I.E., David Calcutt


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