TheGPSsystem includesthreeparts: space GPS satelliteconstellation; Groundcontrolpart-groundmonitoringsystem; UserequipmentPart GPSsignal receiver. TheGPSsatelliteconstellation GPSsatellite and constellation consistsof21 sat

     Nowthe carnavigationproducts receivedmore carowners attention, manypeoplearealready or readytobuy navigation products. Butthemarket carGPSproducts areinnumerable, manysmall brand name nevereven heardof, nott

     Atpresent, thereare moreandmorepeople payattentiontoGPS, whenthe buybackisa problemhasbeenaround them, thatis tobuythe GPS requiredtopaytouse?Whatyou buyis GPSreceiver, whileusingit when receivingasignal America&

     EffectofGPS receivingantenna, the electromagneticwave energyconversion radiosignal to the satellite receiver electronicscan current intakeof application. Antennasizeandshape isveryimportant, becausethese characte

     GPSdevelopsquickly, alotofpeople slowly heardor sawGPS products. Butlet morepeoplefeel verypuzzled, what isGPS? What is the GPS? This isavery common butverybasicquestion, but alsoa veryprofess

     Thevehicle hasahand-held, currentlyonthemarket products accordingtothetypesof mobilephone, GPS, GPS PDA, GPSmodule categories, regardlessof whattypeofnavigationproducts, powersupplyproblem isoneoftheimportant factors