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GPSGPS1.2.3.4.5.6.•c=299792458m/s•f1=1575420000hz•1=c/f10.19m•f2=1227600000hz•2=c/f20.24m1tRGPStRGPSGPStSGPStSGPSGPSRGPSGPSSGPSGPSrrRttd+=ssSttd+=12[][]dddΔ+Δ=+-+=-=ΔttttttsrrrSRSRttt-=ΔdrdΔ+=Δ+Δ=Δ=cctctcPcPttRS/-=srddd-=Δ2StGPSfSRtGPSfRrtGPS∫=ttfdt0j)()(ctfttfrjr-=-=22SSSScftft0)(jrj--=RRRtft0)(jj-=SSSfdj-=0RRRfdj-=0tffffcftttRSRRSSSRSSR)()()()(-+-+-=-=ddrjjj23fSfRf0drjΔ--=fcftSR)(Nc+Δ+=dlrlf1Ncldrlf+Δ+==Φ24C/A10—300mP10—30cm0.2—5mm25P1P2L1L2ikItrn1n2ikikikikikikikikikikikikikikikikikikikikikikNcctrIffLNcctrILcctrIffPcctrIP2222212111222121lddrlddrddrddr+-+Δ+-=+-+Δ+-=-+Δ++=-+Δ++=dlrlf&&&Δ+==cD1