Small scale hydrographic surveys are now achievable at low-cost thanks to the MIDAS Surveyor.
The system is supplied with a 210kHz transducer as standard and uses Valeport’s own advanced digital signal processing techniques to ensure high accuracy and reliable bottom tracking. With an integral SBAS enabled DGPS receiver, the MIDAS Surveyor will log position and depth data for over 30 hours, as well as performing on-line correction using external heave and tide data inputs. Options include an additional 33kHz transducer, or high accuracy 16 channel DGPS receiver.
Single (210kHz) or dual (210 / 33kHz) channel input, using unique “fuzzy logic” DSP to give accurate readings and reliable performance, even in shallow water. Data may be logged and output either raw (as measured) or corrected for tide and heave.
0.3 - 100m (210kHz), 1.8 - 100m (33kHz)
greater of ±0.01m or ±0.02%
0.01m (210kHz), 0.04m (33kHz)
MIDAS Surveyor logs and displays DGPS position data in WGS84 or Local Grid. User has full control over spheroid and projection constants for Local Grid
Integral 12 channel GPS/SBAS receiver with combined antenna: ± 4m (CEP), with no correction ± 2m (CEP), with SBAS correction
Surveyor also accepts user’s own differential GPS or RTK data input.
The Surveyor will accept data input from all the additional sensors listed below. All data may be logged and output in real time on a single RS232 channel, and tide & heave data may be used to provide real time corrections to depth data.
RS232 text data from tide gauge or RTK.
RS232 data from heave sensor (up to 60Hz).
Continuous or spot readings from Valeport Sound Velocity Sensors may also be logged.
RS232 input of vessel heading or any other text string may be logged with the survey data.
Surveyor is supplied with remote event marker
Real Time RS232 output on a single channel of any, some or all of the active data inputs, in choice of industry standard formats.
16Mb internal FLASH memory provides nominal 32 hours of data logging. An optional 32Mbyte memory is available at time of order. 240 x 128 pixel graphics LCD display, providing numerical and graphical depth display, position data (WGS84 or Local Grid) and all other incoming parameters. On screen help and simple menu-driven setup functions allow full system control.
8.4Ah sealed lead acid battery pack
12 – 24V DC
3W (sampling), 25W (max when recharging)
Nominal 24hours working time (Recharge using external power)
Surveyor is supplied with SurveyLog, a Windows based software package, allowing data extraction & display. All data is presented in ASCII format, and may easily be exported for use in industry standard hydrographic survey software packages, or simple XYZ format data.
Rugged IP67 case, 35 x 33 x 16cm, 9kg
IP67 case, 41 x 33 x 18cm, 9kg
Combined 210/33kHz, 30 x 30 x 10cm, 12kg
62 x 44 x 38cm, 18kg (basic set)
MIDAS Surveyor logging unit with 16Mb memory · Internal battery pack and DC power lead · RS232 output lead, · Event marker · Operating manual & SurveyLog software
210kHz transducer 10m cable and mounting spigot
Integral 12 channel GPS/SBAS receiver Antenna, 5m cable and mounting spigot.
33kHz transducer 10m cable and mounting spar
33/210kHz transducer 10m cable and mounting spar
RS232 input lead for external data input (tide, heave etc.)