GDAPS_logo
GDAPS-4A
Geophysical Data Acquisition and Processing System
MAIN FEATURES
GDAPS-4 is an advanced computerized telemetry seismic recording system for geophysical data acquisition and processing.
The system consists of Central Recording Unit (CRU), Slave Control Unit (SLCU), Remote Station Unit (RSU) and Digital Telemetry Cable (DTC).

Main features:
  • Advanced computerized telemetry system based on a high performance and expandable single board computer UNIX environment
  • Wide dynamic range 24-bit Δ-Σ A/D converter
  • Diverse analysis/processing
    2D/3D survey design
    Data analysis
    Data processing (optional)
  • Super multi channel system:
    1024 seismic lines x 2034 channels/line
    Practically no limitation of channels
  • Easy menu-driven operation
  • Microwave radio communication
    (WAVELINK option)
    Eliminates detouring at obstacles
    (rivers, lakes, roads, etc.)
RSU
GDAPS-4A SPREAD CONFIGRATION GDAPS-4A Spread Configuration

CRU : Central Recording Unit
RSU : Remote Station Unit
BU : Battery Unit
DTCL : Digital Telemetry Cable for Line
DTCM : Digital Telemetry Cable for Multi-Line
HT : Handy Terminal
SLCU : Slave Line Control Unit
CEU : Cable Extension Unit
CENTRAL RECORDING UNIT
The Central Recording Unit (CRU) is a suite of hardware devices and system management software. The CRU provides total system control to efficiently acquire and process seismic data.

Features:
  • Master Unit with high performance single board computer expandable with system size
  • High portable modules
  • Standard operating system and Bus system
    Sun SOLARIS
    X-Window System/OSF Motif, VME Bus
  • Interactive processing software
    2D/3D survey design
    binning, fold, azimuth, and other displays
    Data analysis
    filter tests, deconvolution tests, F-K
    filtering and others
    Data processing (optional)
    Complete On-Site processing
FIELD UNIT
Features:

Remote Station Unit (RSU)
  • Wide dynamic range 24-bit Δ-Σ A/D converter
  • Low power consumption
  • Water proof
  • Easy maintenance
  • stacker/correlator (optional)


Battery Unit (BU)
  • Types of battery
    Ni-Cd (standard), Lead acid (optional)
  • Monitoring of charge/discharge cycle and voltage
  • Power options
    Battery
    Partial central feeding
Slave Line Control Unit (SLCU)
  • High speed transmission rate 32Mbps
Digital Telemetry Cable (DTC)
  • Line cable (DTCL)
    Take-out cable
    220m (standard length)
  • Multi-line cable (DTCM)
    12 twisted pairs over 32Mbps
Handy Terminal (HT)
  • Off-line RSU line tester



The ground units of GDAPS-4

GDAPS-4 Management Software
GDAPS-4 Management Software provides complete control over GDAPS-4 devices for efficient field operation.

Features:
  • Seismic data recording on tape and disk
    IBM 3480/3490 compatible cartridge of 9-track tape
  • Logging of recording parameters and status
  • Noise monitor display
  • Hard copy plot of system tests
  • Plot/display of seismic data
  • System tests:
    System noise
    DC offset
    Dynamic range
    Filter response
    Distortion
    Geophone resistance
    Self-diagnostics
  • Utilities:
    Tape copy
    Hexadecimal dump of SEG Y/SEG D tape
    Log file editing

Line information


Recording control


System noise test

QC and Basic Processing Software
2D/3D Survey Design
Features:
  • Calculation of geometry attributes:
    Distance distribution
    Azimuth angle distribution
    Stacking fold
    Rebinning
    Elevation
  • Full editing capabilities for shot and receiver information
  • A full functional spreadsheet

Data Analysis
Features:
  • Display of seismic data
  • Parameter testing
    filter, deconvolution, gain
  • Trace editing
  • F-K analysis
  • Trace attribute analysis

2D/3D Data Processing (optional)
Features:
  • 2D/3D Geometry
  • 2D/3D Normal Moveout
  • 2D/3D Statics
  • 2D/3D Stacking
  • 2D/3D Velocity Analysis
  • Filtering
  • Scaling
  • Deconvolution

Fold distribution



Filter test



Velocity analysis

SPECIFICATIONS
1. CRU (Central Recording Unit)
Line Capacity :512 lines x 2
Channel Capacity :2034 channels/line
Master Unit :VME Bus system
Processor : SPARC VME board/Sun SOLARIS 2.x
Multi-Line Controller
Auxiliary Channel Controller
Source Controller
Rasterizer
DSP
Tape Drive :1/2" Cartridge Tape Drive
9-track, 8mm Tape Drive (optional)
Plotter :12-24" Thermal Plotter
Operator Interface :17-20" CRT Color Monitor with Keyboard and Mouse
13" TFT Color Monitor (optional)
Printer :Compact Printer
Management Software :Complete control over GDAPS-4 devices for efficient field operation.
2D/3D survey design
Seismic Data Recording
Quality control
Seismic data analysis
Trace display on screen
Real time noise monitoring
Complete Field Unit tests
Parameter and status logging/report
Other utility functions
2. RSU (Remote Station Unit)
A/D Converter :24-bit (23+Sign) Δ-Σ
Digital Filter :Linear, Minimum Phase (Built-in Time Zero)
Data Channel/RSU:6
Sample Interval:0.5, 1, 2, 4ms
Maximum Record Length:32,768 samples
Frequency Response:DC to 822Hz at 0.5ms sample interval
Cross-feed Isolation:<-100dB
Pre-amp Gain:6, 18, 30dB
Dynamic Range:120dB
Distortion:0.0005%
Common Mode Rejection:>100dB at 30dB pre-amp gain
Maximum Input Signal:1.6 Vrms at 6dB pre-amp gain
Equivalent Input Noise:<1.48μVrms at 6dB pre-amp gain
(2ms sample interval)
Power Consumption:2.52W (0.42W/ch x Channels)
Weight:<6kg
Size:304mm(W)x264mm(D)x170mm(H)
Test Capabilities:Dynamic Range
Equivalent Input Noise
Geophone Resistance
Geophone Leakage
Common Mode Rejection
Crossed Isolation
Preamp Gain Step Accuracy
Pulse Test (Overall Response Test)
Channel Gain Matching
DC offset
Regulator Voltage/Temperature
Link Check
Stacker/Correlator (Option):Stacker
32-bit Floating Point
Amplitude Balancing Stack
:Correlator
32-bit Floating Point
Before or After Stack
3. BU (Battery Unit)
Type of Battery :NiCd, Lead acid (option) BU
ominal Voltage:12V
Capacity:7AH
Battery Monitor:Monitor of charge/discharge cycle, voltage and temperature
4. SLCU (Slave Line Control Unit)
Transmission Rate :32Mbps SLCU
Channel Capacity:2034
Normal Voltage:12V
5. DTC (Digital Telemetry Cable)
Multi-Line Cable (DTCM)
Cable Length:250m (standard)
Transmission Rate:>32Mbps
Weight:23Kg
Line Cable (DTCL)
Takeout Interval:50m (standard)
Cable Length:220m (standard)
Transmission Rate:4Mbps
Weight:20Kg
6. WAVELINK
The repeater unit with microwave radio
Maximum Transmission :800m/2km WAVELINK
Range
Frequency Range:2.4GHz/50GHz
7. POWER SUPPLY
:Individual Battery

JGI, Inc. reserves the right to change the product specifications without notice.


Headquarters:
Meikei Building
1-5-21, Otsuka Bunkyo-ku,
Tokyo 112-0012 Japan
Phone : +81-3-5978-8021　Fax : +81-3-5978-8060
e-mail : Info@jgi.co.jp
http://www.jgi-inc.com/

Ranzan System Center:
7-5 Hanami-dai, Ranzan-machi Hiki-gun,
Saitama 355-0204 Japan
Phone : 81-493-63-1234　Fax : 81-493-63-1240

Beijing:
Room No.2302, China World Trade Center,
No.1 Jianguo-Menwai Ave.,
Beijing 100004 China
Phone : +86-10-6505-1205　Fax : 86-10-6505-1206
Technical Support
Phone : +86-10-6731-0390　Fax : 86-10-6731-0390