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1、外文文獻ACoalMineEnvironmentalMonitSystemwithLocalizationI.RESEARCHSTATUSAsanimptantenergycoalplaysapivotalroleintheeconomicdevelopment.Coalminemonitingsystemistheimptantguaranteefcoalminesafetyhighefficiencyproduction.Inder

2、toensurethesafeoperationtheinstallationofenvironmentmonitingnodeintunnelstorealtimedetectionisveryimptant.Howevercommonlyusedtraditionalmonitingnodewiredconnectiontoobtaincommunicationwiththecontrolsystemthisnodeexistwir

3、ingdifficultiesexpensiveothershtcomings.Incontrastwirelesssensnodecanbeeasilywithcurrentminemonitingwkconnectiongoodcompatibilityfacilitateconstitutedminegasmonitingwktosuitvarioussizeofmineapplications.Sincewirelessnode

4、sarebatterypoweredsocompletelyoutoftheshacklesofthecableshtentheconstructionperiodcanbearrangedatanytimewheretheneedtouse.TheZigbeewirelesscommunicationtechnologyisusedinthiscoalmineenvironmentalmonitsystem.Thisisanewsht

5、rangelowcomplexitylowpowerlowdataratelowcosttwowaywirelesscommunicationtechnology.NowwirelesssenswkproductbasedonZigbeetechnologyarequantityvarietybuttherealproductcanbeappliedinundergroundenvironmentsofspecialsensnodeis

6、veryfew.Thesensnodethatwedesignedinthesystemistrulyabletoapplytoinwellenvironmentitthroughthewirelesssensnodesecuritycertification.Atthesametimeduetothespecialnatureofthewirelesswkisthatitcanspreadthewirelesssignalwecane

7、asilylocatestafffcoalminesafetymonitingprovidesmeprotection.II.SYSTEMARCHITECTUREThissystemisacomprehensivemonitingsystemwhichiscombinedwithsoftwarehardware.Hardwarepartincludeswirelessmobilenodesfixednodeswhichweredeplo

8、yedintheundergroundtunnelthemainfunctionofthemistocollectcoalmineenvironmentdatarequireperson’slocation.SoftwarepartreferstothePCmonitingsoftwarewhichisdesignedinVCisusedtosummarizewedesignedisonlyassmallasamobilephoneit

9、isbybuiltinlithiumionbatterypowersupply.InpowerlosstheceprocessCC2530isalowpowerconsumptionchipwhenitisinthesleepmodeitonlyneedtouselessthen1uAwkcurrent.Indertoreducepowerconsumptionasmuchaspossibleonthedisplaya10032pixe

10、lmatrixwithnobacklightingLCDscreenwasused.Thebattery’scapacityofthemobilenodeis1500mAhsoitisenoughtomeettheminer’slonghourwksintheunderground.ThebatterygemanagementchipisTP4057themaximumgecurrentcanupto500Ma.Themobilenod

11、ecircuitincludesthegasconcentrationsensMJ4.0temperaturesensPT1000.Asfarasweknowmanywirelesssensplatfmsusethedigitaltypesens.ThecommunicationbetweenthedigitalsenstheMCUneedstricttimingrequirements.Butconsideringtheactuala

12、pplicationthewirelessMCUusuallyhasarealtimeoperatingsystemingeneralifweusethemicrocomputertosimulatethestricttimingitwillaffecttherealtimeofwholeoperatingsystem.Thesetwosenssoutputanalogsignalsnotdigitalsignals.Onlyinput

13、thissignalintoadifferentialamplifiercanwegetanappropriatesignalthatcanbeconvertedtoadigitalsignalbyanADCmodewithintheCC2530chip.Indertofacilitatethecarryingexternalantennawasnotusedinourmobilenodeinsteadofusinga2.4GHzpat

14、chantenna.wecustomizeashelllikeacellphonesizeitisenoughtoputallPCBssenssbatteryinit.TakingintoaccountthesmallshelloftheexplosiveperfmanceisnotverygoodthedesignofPCBstheionofcomponentareallcarriedoutthesafetyassessment.B.

15、FixedNodeFixednodeisinstalledinthewalloftheundergroundtunnel.Becauseitisbigthanthemobilenodeitisnotappropriatetocarryaround.ThecircuitofthefixednodeisalmostsamewiththemobilenodeitalsouseaCC2530chipasceprocess.Becauseofun

16、dergroundtunnelsgenerallydeploywithpowercablefixednodescanusecablepowersupplymodes.Atthesametimebecauseweusewirelesssignaltransmissionthedeploymentofnewfixednodesbecomeveryconvenientwhichalsoresolvestheproblemofthesignal

17、linesdeployment.AsafixednodetheminwhoisdoingwkmayfarfromitindertofacilitatetheminersobservedenvironmentaldataaroundthefixednodesitusesLEDdigitaldisplay.AtthesametimethelargecurrentLEDlightsbuzzeraredesignedinthecircuitit

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