GPS GPS(Global Positioning System) GPS GPS 1 GPS GPS GPS I II 1994 ( 1991 ) 1

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1 GPS GPS(Global Positioning System) GPS GPS 1 GPS GPS GPS I II 1994 ( 1991 ) 1

2 1: GPS 1.1 GPS GPS c = m/sec (1) ( ) GPS GPS GPS t t [sec] t r [sec] r[m] c[m/sec] r = c(t r t t ) (2) GPS (N ) i GPS r i [m] GPS (x, y, z) i GPS (x i, y i, z i ) r 2 i = (x i x) 2 + (y i y) 2 + (z i z) 2 (3) 2

3 r r 3 r 2 2 2: r 2 1 = (x 1 x) 2 + (y 1 y) 2 + (z 1 z) 2 r 2 2 = (x 2 x) 2 + (y 2 y) 2 + (z 2 z) 2 r 2 N = (x N x) 2 + (y N y) 2 + (z N z) 2 (4) (x, y, z) 2 3

4 1.1.2 GPS i GPS r i [m] δ[sec] (pseudo-range) r i[m] r i = r i + cδ (5) (r 1 cδ) 2 = (x 1 x) 2 + (y 1 y) 2 + (z 1 z) 2 (r 2 cδ) 2 = (x 2 x) 2 + (y 2 y) 2 + (z 2 z) 2 (r N cδ) 2 = (x N x) 2 + (y N y) 2 + (z N z) 2 (6) (x, y, z, δ) GPS GPS 1.2 GPS m 10 n sec (10 8 sec 1 1 ) ( ) 1 =86400 sec) sec = sec (7) sec m/sec = 25.9m (8) 4

5 m 2 ( ) GPS E 1, E 2 ν [3] ν = (E 2 E 1 )/h (9) h (Planck) (Heisenberg) t E [3] t E h (10) 9) E = h ν ν = (2π t) 1 (11) t 1 5

6 2.1 1 (1/2) L S = 1/2 J J = L + 1/2, L 1/2 L 0 0 LS I I = 0 I = 1/2, 3/2, 5/2,... I = 1, 2, 3,... I S = 1/2 F F = I + 1/2 F = I / (10 18 [sec] 1 )

7 2 ν Cs = 9, 192, 631, 770Hz (12) 2.2 (Cs) 133 Cs (6S ) 133 Cs I = 7/2 6S F = 4, ( ) 2 (Ramsey) [4] 2 t (Rb) 87 Rb (5S ) ν 87Rb = 6, 834, 682, 612.8Hz (13) 87 Rb I = 3/2 5S F = 2, 1 2 [4] (5S 5P )

8 87 Rb 5S F = 2, 1 F = 1 5P F = 1 5P 5P F = 2, 1 F = 1 F = 2 F = 2 3 F = 1 F = 2 F = 1 F = 2 [4] 5P 5S F=2 F=1 3: 3 (Ne, Ar, Kr, N 2 ) Rb 1 8

9 3 ( )[5] 3.1 GPS GPS UTC( ) 1. ( ) GPS GPS 2. (2 ) U/c 2 = (14) GPS (3.874 km/sec) GPS (v/c) 2 /2 = (15) ECI(Earth-Centered Inertial system) v dτ dt dτ ( 1 + U c 2 v2 2c 2 ) dt (16) GPS (16) 3.2 GPS GPS 2 [2] 9

10 3.2.1 (Sagnac) ECEF (Earth-Centered Earth-Fixed) GPS ( 70 m sec) m GPS (16) ±10 m GPS TOPEX/Poseidon [2] GPS GPS 16 3 NASA (Center National d Etudes Spatiales: CNES) 10

11 km D iono [m] D iono = 40.3N e f 2, (17) f N e % 4.3 GPS GPS 4.4 GPS GPS GPS 11

12 5 GPS GPS 5.1 (space segment) GPS ) 55 26,562 km( 20,200 km) ( 0.01 ) GPS 1989 GPS II,IIA 2 (Cs) ( ) 2 (Rb) GPS IIR 3 (Rb) MHz 154 ( GHz L1 ) 120 ( GHz L2 ) 2 [1] 5.2 (control segment) GPS 5 (monitor station: Ascension Island, Colorado Springs, Diego Garcia, Kwajalein, Hawaii) 1 (master control station: Colorado Springs Schriever ) 3 (Ascension Island, Diego Garcia and Kwajalein) (2006 ) 1 GPS 4 II,IIA 5 IIR Rb 2 Cs 1 Cs Rb 3 12

13 GPS (USNO: US Navy Observatory) GPS 20 n sec [2] 5.3 (user segment) 3 3 GPS 4 GPS 4 GPS GPS GPS P ( ) C/A ( ) GPS GHz(L1 ) GHz (L2 ) 2 2 L1 50% (PSK:Phase Shift Keying) GPS P ( 6 16m, L1,L2 ) C/A ( m L1 ) (SA:Selective Availability) SA 13

14 SA C/A 5 20m [6] SA SA DGPS ( ) SA C/A Mbps; 1msec P Mbps; DGPS(Differential GPS) GPS GPS GPS C/A ( km ) m GPS(Differential GPS) DGPS SA GPS ( ) 10 km 2 mm GPS 1/100 GPS GPS [1] 2 14

15 GPS RTK GPS(Real Time Kinematic GPS) RTK GPS(Real Time Kinematic GPS) RTK GPS 10 km 7 GPS GPS 7.1 GLONASS GLONASS (Global Navigation Satellite System) GPS GPS (CDMA) GLONASS (FDMA) 15

16 ,510 km GLONASS Galileo(EU) Galileo (EU) (ESA: European Space Agency) Galileo GIOVE-A Galileo GPS GLONASS Galileo ,000 km( 23,616 km) GPS 5 20 m Galileo m 4 m Galileo M Hz(E5 ) M Hz(E6 ) M Hz(L1 ) 3 (Open Service, OS) M Hz(E5 ) M Hz(L1 ) 4 m 8 m 16

17 (encrypted Commercial Service, CS) (1 m ) M Hz(E5 ) M Hz(E6 ) M Hz(L1 ) 3 3 RTK) TCAR(Three-Carrier Ambiguity Resolution) Galileo EU Galileo Galileo Galileo Galileo Galileo

18 ( 0.1 ) GPS L1 L2 E6 L GPS DGPS GPS GPS GPS (SBAS) WAAS SBAS( GPS ) EGNOS SBAS MSAS SBAS 6 (MTSAT-1R) (MTSAT-2)

19 [1] ( ISBN: ) [2] GPS [3] J.J.Sakurai, [4] ( ISBN: ) [5] Neil Ashby, Relativity in the Global Positioning System, Living Rev. Relativity 6, (2003), 1. [Online article] [6] GPS ( ISBN: ) 19

GPS 1 2 GPS 29 GPS II IIA IIR 3 2 km GPS GPS 3 ID GPS 4 GPS GPS X Y GPS 1575:42 MHz L1 C/A coarse/acquisition code C/A SPS; standard po- 1:

GPS 1 2 GPS 29 GPS II IIA IIR 3 2 km GPS GPS 3 ID GPS 4 GPS GPS X Y GPS 1575:42 MHz L1 C/A coarse/acquisition code C/A SPS; standard po- 1: A1 GPS/GNSS sakai@enrigojp A11 GPS GPS GPS { 29 GPS 6 10 13 m 95% GPS GLONASS Galileo GNSS global navigation satellite system GPS GPS GPS 2005 9 IIR-M L2C SBAS satellite-based augmentation system WAAS

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