LX-80-15 10 Hz User Manual
12
LX-80-15 10 Hz Oceanographic Radar Sensor
5
Wave and Tide Measurement
The Geolux LX-80-15 10 Hz oceanographic radar sensor makes water level measurements at 10
Hz sampling rate, as opposed to the standard version which makes one measurement per second
(1 Hz sampling rate).
The radar sensor calculates the wave and tide parameters based on the continuous readings of the
water level over a defined time period. The time period is configurable, and is configured by setting
the number of level measurements. For example, if the wave parameters should be measured over 1
minute, then the
Wave Analysis Length
parameter should be configured to 600 (10 measurements per
send multiplied by 60 seconds).The maximum period is 6 minutes, which corresponds to
Wave Analysis
Length
of 3600.
The radar sensor calculates and reports the following wave parameters in addition to the
measurements reported by the standard version of LX-80 water level meter.
5.1. Significant Wave Height
5.1.1. Significant Wave Height as an Average
of 1/3 of Highest Waves - H
1/3
The original method for calculating the significant wave height analyses the time-domain water level
measurements. From the time-domain water level measurements, it calculates the individual wave
heights, then takes one-third of the highest individual waves and calculates their average value.
5.1.2. Significant Wave Height Calculated
from Standard Deviation - H
S
A more modern method calculates the wave height from the time-domain water level measurement
data by calculating the standard deviation of the water level measurements, and multiplying the
standard deviation by 4.
5.1.3. Significant Wave Height Calculated
from Spectral Moment - H
S_M0
The third method for significant wave height calculation uses the zero moment (M
0
) of the power
spectrum.
Содержание LX-80-15
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