HD-MAX Echo Sounder User Guide
8
Navigation Overview
Global Positioning System (GPS) has developed for many years. It has been
upgraded from stand-alone GPS accurate to 100m which can only be applied
for rough navigation and positioning to real-time differential GPS (DGPS)
accurate to several centimeters which can be applied in various measurement
fields. GPS technology has become increasingly mature, varieties of products
have been produced, and there are more and more users applying DGPS
technology.
As the world's most popular positioning method, DGPS has been widely
applied in marine sounding, waterway survey, engineering exploration
orientation, cadastral survey, terrain cadastral survey, boundary demarcation,
harbor piloting, navigation of geophysical prospecting and hydrocarbon
exploration and staking of seismic shot and other measurement fields. Thus,
a measuring software which can realize multiple functions is needed.
The software is compatible to a variety of import and domestic GPS receivers.
It is a measuring tool software integrating measurement, editing and other
multiple functions with task-based operating mode and fool operation
interface. Adhering to the purpose of high and new technology popularization
as well as plebification. The software will appreciate the users relying on
more economical price as well as intelligent operation.
Principle of Echo sounder
Echo sounding principle
It is assumed that the sound speed under water is V. In case of a pulse
acoustic signal being loaded on a transducer, acoustic wave is transmitted
from the transducer to the seabed and then back. The time of acoustic signal
round trip is t, then:
