Xylem SonTek River Surveyor M9, Системное руководство

Страница: 126 / 164

SonTek, a Xylem brand
116 RiverSurveyor S5/M9 System Manual (February 2013)
RiverSurveyor Live v3.00
RiverSurveyor Mobile v3.00
1. Smart Page Setup
This feature provides a step by step guide through the system setup with real-time feedback
to collect the most reliable discharge measurements. System functional test results (such as
a compass calibration) as well as system settings are stored in the data file for easier ac-
cess in post-processing. The initial screen after connecting now displays red or green icons
depending on the status of system functional test and system settings.
There is also an option to turn off/on the Composite Tracks feature. This setting by default
is ON, in both software and firmware. When disabled the track is calculated only using the
selected reference and not a combination of the best possible references.
2. GPS Compass Integration
This feature lets you collect true north heading from a GPS Compass sensor. This capability
lets you collect reliable heading data where magnetic interference is an issue and GPS cov-
erage is available. In addition to true-north heading information, the GPS compass simulta-
neously outputs GPGGA (differential using SBAS) and GPVTG NMEA data strings, which
are used by the M9/S5 to compute position and boat-speed. In addition, the firmware and
software let you input the X and Y distance between the GPS antenna and the M9/S5. This
allows the GPS compass antenna to be mounted virtually anywhere on the boat.
The system requirements for using GPS compass sensor:
a. Data output rate at 10 Hz
b. Ability to output GPGGA, GPVTG and HEHDT NMEA sentences
c. Communication baud rate of 38400
Note: To collect GPS Compass Heading data, you must obtain a security code that allows
you to enable this feature in the system’s firmware. For details on obtaining this code, you
will need to contact SonTek.
3. USGS SMBA Method
The SMBA-method correction is used when a moving-bed is present and a DGPS or com-
pass is not available or reliable. The calculations are all based on the “Algorithms Used in
SMBA” by David S. Mueller and USGS calculations and procedures documented in the
USGS “Scientific Investigations Report 2006-5079” by Mueller and Wagner. The USGS rec-
ommends a moving-bed test prior to the start of any discharge measurement and the SMBA
method is routinely used to identify the magnitude of the moving-bed. The RiverSurveyor
software now guides you step by step through this procedure, and then allows you to apply
the correction to the appropriate discharge measurements without having to export data to
the USGS SMBA program. This saves time and effort in the field and in the office whenever
you use this procedure.
4.
Additional Profile Extrapolation Methods
This version of the firmware supports one additional top and bottom extrapolation method.
The top methods are Constant, Power, and 3-point slope; the bottom methods are Constant,