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MIDAS Surveyor Operating Manual

Page 35

0420805d.doc

5.6.1.1

ASCII File Data Format

The data is recorded in sequence as it is measured. With so many possible data inputs (position, depth, tide, heave,

sound velocity, gyro) all coming at independent (asynchronous) times, it is necessary for each data type to be identified

in the file.

Looking at an ASCII data file, the first 40 or so lines of data are simply header information describing the system setup.

The data lines then begin, as shown in the sample screen on the previous page. The various data lines and their

identifiers are as follows:

DATA TYPE

STRING COMPOSITION

GPS Position

Ident No.
Time (s) since Year 2000
Latitude (WGS84)
Longitude (WGS84)
GPS Height (m) above datum
Easting (local grid)
Northing (local grid)
Data count (housekeeping purposes only, normally 8 or 9)
Type of Fix

0: No Fix

1: Uncorrected Fix

2: Differentially Corrected Fix (SBAS or Beacon)

3: RTK data (external input only)

Number of satellites
Age of Correction (0 if SBAS or no correction)
HDOP
Speed (knots)
Heading (degrees)

Corrected Depth

Ident No
HF depth (m)
LF depth (m)

Corrected Depth + Heave

Ident No
HF depth (m)
LF depth (m)
Heave correction value (cm)

Corrected Depth + Heave + Tide

Ident No
HF depth (m)
LF depth (m)
Heave correction value (cm)
Tide Correction value (cm)

Corrected Depth + Tide

Ident No
HF depth (m)
LF depth (m)
Tide Correction value (cm)

Uncorrected Depth

Ident No
HF depth (m)
LF depth (m)

Uncorrected Depth + Heave

Ident No
HF depth (m)
LF depth (m)
Heave correction value (cm)

Uncorrected Depth + Heave + Tide

Ident No
HF depth (m)
LF depth (m)
Heave correction value (cm)
Tide Correction value (cm)

Uncorrected Depth + Tide

Ident No
HF depth (m)
LF depth (m)
Tide Correction value (cm)

Содержание MIDAS Surveyor

Страница 1: ...e Company This document must not be copied reprinted or reproduced in any material form either wholly or in part and the contents of this document and any method or technique available therefrom must...

Страница 2: ...ameters 15 4 2 3 5 Sound Velocity Interval 15 4 2 3 6 Tide Interval 16 4 2 3 7 Auxiliary Interval 16 4 2 4 RS232 Com Ports 16 4 2 5 Output Setup 17 4 2 6 Display setup 19 4 2 6 1 LCD delay 19 4 2 6 2...

Страница 3: ...con Frequency 29 4 2 13 5 Echo External RTCM 29 4 2 14 Command Mode 29 4 2 15 Power Off 29 5 SURVEYLOG SOFTWARE 30 5 1 Introduction 30 5 2 Installation 30 5 3 Establishing Communications 31 5 4 File M...

Страница 4: ...PS receiver Valeport offer a choice of two industry standard GPS receivers an Ashtech A12 twelve channel DGPS receiver or a high accuracy Ashtech DG16 sixteen channel DGPS receiver Both receivers feat...

Страница 5: ...te FLASH memory holds approximately 30 hours data Optional 32Mbyte FLASH memory 2 2 TRANSDUCERS 2 2 1 HIGH FREQUENCY Frequency 210kHz 200kHz option Accuracy greater of 0 01m or 0 02 reading Resolution...

Страница 6: ...Control Manual or Automatic set through MIDAS Surveyor 2 4 CONNECTORS 11 9 7 5 3 1 2 4 6 8 10 12 1 GPS antenna 2 LF Echosounder transducer 3 HF Echosounder transducer 4 External DC input Red Charging...

Страница 7: ...ally downwards If anything the transducer should point a degree or two forward of vertical to help eliminate any cavitation effects at higher speed The combined transducer should be fitted with the sl...

Страница 8: ...a field deployment The system is designed so that it will always draw its operating power from these internal batteries The system is supplied with an external DC input lead which should be used to c...

Страница 9: ...ly assume that it is better than the standard SBAS correction and will use it instead If a full external GPS input is used the internal GPS receiver should be disabled as described in Section 4 2 10 1...

Страница 10: ...mpensate for the GPS antenna being sited at a different location to the echosounder transducer The user is invited to enter this offset value during the system setup see Section 4 2 10 4 but this offs...

Страница 11: ...ated pressing or pressing and holding darkens contrast When maximum contrast is reached the next press will revert to minimum contrast Help Causes a text message to be displayed on screen describing t...

Страница 12: ...o do so although it will begin a new data file 4 1 RUN MODE The basic Run screen is indicated above and may be described as follows Bottom line of text Function keys and warning messages F1 Log On Off...

Страница 13: ...instrument has been used or it is being used in a new location or configuration it is strongly advised that the each of the System Setup functions are viewed and changed as appropriate This applies pa...

Страница 14: ...ways Turns instrument off 4 2 3 LOGGING SETUP The Logging Setup sub menu includes the following features 4 2 3 1 Log On Off This will allow the user to turn the data logging function on and off Access...

Страница 15: ...Corrected Depth value only CORR HEAVE Corrected Depth value and Heave input COR HVE TID Corrected Depth value together with Heave and Tide values CORR TIDE Corrected Depth value and Tide input If Real...

Страница 16: ...a points from this input to be logged to memory Use up and down arrows to scroll through the logging interval in 1 second increments from OFF through to 300 seconds 5 minutes and F3 to confirm Note th...

Страница 17: ...type 0 Invalid or not available 1 Autonomous uncorrected position 2 RTCM or SBAS differentially corrected d2 Number of satellites used in position computation f1 Horizontal dilution of precision HDOP...

Страница 18: ...ms may be blank F fathom label cc Checksum Example SDDBS f 088 98 M F 3D DBT SDDBT aaaaa f bbbbb m ccccc F cc where SDDBT identifier DBT Depth Below Transducer NB Surveyor draft value is NOT added to...

Страница 19: ...ol the full data input string from any single chosen parameter may be displayed across the bottom of the screen Use the up down keys to scroll through the available options and Enter to confirm Off No...

Страница 20: ...0000 Y axis rotational position 0 000000 Z axis rotational position 0 000000 XYZ Datum Scale Factor 0 0000000 Note that some spheroid references give an E figure instead of Flattening E stands for Ecc...

Страница 21: ...anging these large numbers is different to that thus far encountered it would take a long time to scroll up or down to the required value The method described below applies to all of the parameters de...

Страница 22: ...5m with Enter to confirm The unit is set to a factory default of 0 5m draft for both high and low frequency transducers 4 2 8 4 Metres Feet The MIDAS Surveyor may display data in either metres or dec...

Страница 23: ...en logging and displaying of RAW or CORRECTED data Up down to toggle Enter to confirm 4 2 9 GPS SETUP 4 2 9 1 GPS Type The MIDAS Surveyor is supplied as standard with an integral 12 channel GPS receiv...

Страница 24: ...ntered Use up or down to toggle between Heading from GPS and Heading from Auxiliary Input 4 2 10 SENSOR SETUP This section of the menu allows the user to setup the Surveyor to receive data from other...

Страница 25: ...e logged as it is received However if it is a gyrocompass that is connected to this port you can choose whether to take the Surveyor heading display from this or from the GPS input As usual use up dow...

Страница 26: ...vailable when the clock is set the entered values for minutes and seconds will be used instead and corrected as soon as there is a fix The assumption is that surveying will not begin until a valid GPS...

Страница 27: ...on an arbitrary scale from 0 OFF to 10 approximately 1 5 seconds Use up and down to scroll up and down the range and Enter to confirm Access to the relay switch is gained by splicing the required wir...

Страница 28: ...t settings Scroll to Reset All Defaults and press Enter The system will shut down and when it is turned on again all default settings will have been restored In summary these are Single channel only I...

Страница 29: ...13 5 Echo External RTCM When setting up a Marine Beacon input it may be desirable to confirm that the receiver is actually picking up a signal Selecting this particular test mode will force any incomi...

Страница 30: ...t although SurveyLog offers a variety of data display modes it offers no data editing features so users may wish to use a standard hydrographic survey package for data manipulation 5 2 INSTALLATION As...

Страница 31: ...u button on the keypad Scroll to the third option down Data Upload Press the Enter button twice to accept this The screen should change to the Data Upload mode screen In SurveyLog select the appropria...

Страница 32: ...n the Erase Memory button DO THIS WITH CAUTION Once erased data files cannot be recovered so be sure that all required files have been successfully uploaded with no data corruption The file upload pro...

Страница 33: ...ly as it was logged with no data processing or interpolation occurring To allow the data to be viewed as graphical and time series plots all data points must be correctly time stamped This requires a...

Страница 34: ...view the logged data exactly as it was recorded with no processing or interpolation simply click the View Translated ASCII File button A standard Windows Open File dialog box will appear Select the re...

Страница 35: ...al grid Northing local grid Data count housekeeping purposes only normally 8 or 9 Type of Fix 0 No Fix 1 Uncorrected Fix 2 Differentially Corrected Fix SBAS or Beacon 3 RTK data external input only Nu...

Страница 36: ...red from false echoes SurveyLog allows such points to be ignored in Valeport and XYZ files Simply set the lower and upper limits for valid data points before clicking on either the View Translated VAL...

Страница 37: ...ate and time are calculated by linear interpolation between the GPS lines For example if there are 6 depth readings between successive GPS lines which are one second apart they will be time stamped 1...

Страница 38: ...View Translated HF XYZ File or V View Translated LF XYZ File as appropriate To view the text data of the XYZ file click the XYZ data tab Again this data may be copied and pasted into other packages bu...

Страница 39: ...with Fix Mark annotations click the XY plot tab This graph shows the survey track with the X axis corresponding to Longitude and the Y axis to Latitude The Fix Mark annotations are numbered sequential...

Страница 40: ...C08 Echo Sounder Line Connector to Junction Box 0420C09 Echo Sounder 33KHz Transducer to Junction Box 0420C10 Echo Sounder 210KHz Transducer to Junction Box 0420C11 External Power Charger Lead 0420C12...

Страница 41: ...ANA PLUGS POWER IN LINECONNECTOR POWER IN 9 WAY D TYPE HEAVE LINECONNECTOR HEAVE DATA LINECONNECTOR DATA COMMS TIDE LINECONNECTOR TIDEHEIGHT EXT E S LINECONNECTOR EXT ECHO SOUNDER SVP LINECONNECTOR SV...

Страница 42: ...210KHz CABLEFORM No 0420C09B CABLEFORM NAME Echo Sounder 33KHz TRANSDUCER to Junction Box PRODUCT Midas Surveyor DRAWN BY D LAKIN CABLE END 1 END 2 FUNCTION WIRE TYPE WIRE COLOUR WIRE LENGTH mm Transd...

Страница 43: ...INSTRUMENT COMMS LEAD PRODUCT Midas Surveyor heave Tide depth SVP aux gyro GPS DRAWN BY D LAKIN CABLE END 1 END 2 END 3 FUNCTION WIRE TYPE WIRE COLOUR WIRE LENGTH mm 7 Way Male Line Connector Fischer...

Страница 44: ...cher PIN SINGLE POLE 1 WAY SWITCH PIN Supplied by Fischer 7 CORE SCREENED 24AWG 6 2mm MAX DIAMETER PROP785 BIPTN AF507 SCREEN 2000 SE103A056 130 6 2 1 RS 373 1640 SCREEN BLACK 2 RELAY 21 WHITE 3 A FIX...

Страница 45: ...1 END 2 FUNCTION WIRE TYPE WIRE COLOUR WIRE LENGTH mm Marine Beacon 6 way connector PIN Junction Box PIN 6 CORE SCREENED FLYING LEAD BLACK As supplied 6 Way female as supplied 1 Connector block 1 Powe...

Страница 46: ...cable spar clamp for A12 SBAS GPS Beacon antenna c w 5m cable spar clamp for DG16 SBA 1 IALA Beacon receiver antenna c w 5m cable spar clamp 210kHz transducer c w 10m cable bracket clamp 33kHz transdu...

Страница 47: ...by any repair or attempted repair or dismantling by any one other than Valeport Limited or persons authorised to do so by Valeport Limited 3 Batteries and other consumables supplied with the equipmen...

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