The Preliminary Research Of Automatic Airborne Gamma Data Collection System

The paper topic selection comes from “863Project” resources andenvironment technology subject “High-Precision Spectrum Detection InstrumentsDevelopment”(Project Number:2012AA061803) and the subproject of ChinaGeological Survey Bureau’s geological survey project “Airborne gammaspectrometry unattended automatic monitoring and control system research”.The airborne gamma data collection system can real-time collect variousgeophysical information, GPS navigation and positioning data and aerialenvironmental information etc in the measurement. Now we bear the high price,secret technical, high maintenance, poor compatibility of the importedaerogeophysical data collection system and the weak data collection ability, lackof hardware interface, poor software interface operability of the domesticindependent data collection system. In view of this, there is an urgent need todeveloped a new generation of aerogeophysical data collection system.It willimprove independence and intelligentization level of aerogeophysical instrument.The new generation of aerogeophysical data collection system lay a foundation forthe modernization of land and resources survey.This topic research the design of a new generation of airborne gamma datacollection system. It uses the ACP-4001integrated workstation as a developmentplatform. The system can collect221024resolution of airborne gammaspectrometry data lines, the GPS positioning information and the aerialtemperature/pressure/radar signal in real-time.The system’s hardware unit bases on PCI bus is respectively connected to theparallel data acquisition card,16road more serial port data acquisition card, GPIBdata acquisition card, analog input and output temperature acquisition card anddual high speed CAN bus card to meet the requirements of collected a variety of data, accesses to the aerial information such as latitude and longitude through GPSpositioning module and uses TTL RS232level conversion module and RS232RS485level conversion module for the connection of multiple serial port data.Thefault diagnosis and alarm module automatic alarm when abnormal data in aerialsurvey.The system software unit bases on a combination of Labwindows/CVI andVisualC++6.0platform development. Use the advantages of two platforms tocomplete the application layer of friendly interface and the underlying dataacquisition. The software unit uses the parallel data transmission method tomaximize the advantage of existing multi-core processor multi-threading as aresult the data processing speed increased. The software unit adopts the three-layerarchitecture:the underlying device driver and control layer,the data dynamic linklayer and the system of application interface layer thereby enhancing thereliability,maintainability,versatility and hardware independence of the softwareunits.In the end the system prototype design completed. The designer researchesaerogeophysical collection system domestic and overseas, in reference to theadvanced design concepts and ideas and finding out the deficiency which needsfurther optimization and upgrading at the same time.The system designs a higherperformance and more stable unit of software and hardware, adds the GPIB, ECP,EPP communication protocol,configurates RS485bus which has stronger noiseresistance higher data transmission rate longer transmission distance,supportTrimble series GPS receiver which is more advanced light and minimal powerconsumption,and the data collection capability improves for example the originalsystem only can collect two256resolution spectral lines unable to meet therequirements of new instruments, this system can inclue twenty1024resolutionspectral lines and two1024resolution synthetic lines. It is to improve the accuracyof measurement.This topic design laid the foundation research for the furtherdevelopment of aerogeophysical system.