GPS

GPSGPS

1.cvaccvac= vacf= vac/T= /kvacc=2.99782458108(m/s)GPS0.10.1m

GPSGPSnn=c/v1N0N0=(n-1)106

dv/df

vpvg

f

GPSvgvp

4.2 1.3.9 1018kg75%10km 90%30km

40km99%1km6.50C100km 10C

70km

2.119002.3m10020m

NdNwN0= Nd+Nw NdNw

(A)

PmbarTkTk=0C+273.2,e0mbar

S0HdNd040km HwNw010km.

H

Nd0A HdH. Hopfield

Nw0AHw=11000m

2.3m90%

GPShs

hs1000.5mHTm

5%20km

3.

etmeNe0et=1.602110-19me=9.11 10-310=8.859 10-12

GPS

(m)(ns)

544109-31012/m351017/m251016/m2

hsNh

400MHz1600MHz2000MHz8000MHz50m3m2m0.12m90%250m15m10m0.6m500m30m20m1.2m

GPS75%50m12.5m

1

150/400MHz400/2000MHz1227/1572MHz2000/8000MHz0.6m0.9cm0.3cm0.04cm90%10m6.6cm1.7cm0.21cm36m22cm4.5cm0.43cm

(2)20km10-6

4.3GPS1.GPS GPSPYC/ADPC/A GPS1234

2.1 01 bit/s

2 01u(t)011/2GPS

u(t)ku(t)u(t)u(t)01AuBuu(t)R(t) R(t) = (Au - Bu) / (Au + Bu) k=0 Bu=0R(t)=1k0AuBuR(t) 0

GPSu(t)GPSu(t)u(t)u(t)R(t) 0u(t)u(t)R(t) =1

3 GPSPseudo Random NoicePRN 0111

4342

1115

4 3 2 12 3+412341 1 1 11 1 1 01 1 0 01 0 0 00001111156780 0 0 10 0 1 00 1 0 01 0 0 10011000191011120 0 1 10 1 1 01 1 0 11 0 1 0010100111314150 1 0 11 0 1 10 1 1 1111010

15115tu tum 154 rmNu=2r-1NuTu=Nutu

rmm

02r-110mR(t)=1, R(t)-1/Nu=-1/(2r-1)rR(t)=0,

3.GPSGPSC/APY1C/A10Nu=210-1=1023tu=1/f1=0.97752s, f1f01011.023 MHz,293.1mTu= Nutu=1ms1.023Mbit/sC/A10235020.5s10012.9m

2P PC/A12Nu2.351014tu=1/f0=0.097752s29.3mTu= Nutu 267d10.23Mbit/s P267P3876.19 10121532PPC/APPC/A1/101/1000.29mP

4.4GPS1. C/APD 150050bit/s30s 510303006s2545251234512345

1TLMTelemetry WORD 2HOWHand Over Word PZZ/GPS31a0a1a2 tt=a0+a1(t-t0e)+a2(t-t0e)2

t0e1GPS/0-604800sAODAt0eWN198016GPS42235345GPS

4.5GPS1GPSf0=10.23MHzGPS

GPSLL11575.42MHz19.03cm L21227.60MHz24.42cmL1C/APY L2PYGPS010+11-1

2. 11

2+1+1+1

1. t0Ae y=Aesin(t+ 0)

fTt=00=2ff=1/T =t/T+ 0 0=20y=Aesin2 (t/T+ 0) v kk= 2/ = /vv= f= /T= /k

SM S S S

SM

t0

t0 N0

t0