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DISCUSSION OF INTEROPERABILITY PHASES BETWEEN BEIDOU GLOBAL SYSTEM AND GPS

Actuality of BeiDou and GPS

Coordinate Reference Frame

BeiDou uses CGS2000 as its coordinate reference frame and keeps a centimeter level bias with ITRF. GPS uses WGS84 as its coordinate reference frame and keeps a centimeter level bias with ITRF.

Time Reference Frame

The time reference frame of BeiDou is called “BDT”; the difference between BDT and UTC (NTSC) is less than 50 ns. The time reference frame of GPS is called “GPST”; the difference between GPST and UTC (USNO) is less than 28 ns.

Open Signals

The civil signal in the GPS L1 band is C/A code-BPSK(1); future civil signals in the L1 band are MBOC (TMBOC in pilot channel and BOC(1,1) in data channel).

The civil signal in the second phase of BeiDou is BPSK(2), and it provides service in the important area (30E~180E, 70S~70N); the civil signal in the third phase is MBOC (TMBOC in pilot channel and BOC(1,1) in data channel) (Tables 1 and 2).

TABLE 1 Signal in the Second and Third Phases of BeiDou

Phase Signal Center frequency (MHz) Code
rate
(MHz)
Modulation Services
BeiDou 2nd. B1(I) 1561.098 2.046 BPSK Open
BeiDou 3rd. B1x/y 1575.42 1.023 TMBOC(6,1,4/33)+BOC(1,1) Open

TABLE 2 Signal of Current GPS and Future GPS

Phase Signal Center frequency (MHz) Code
rate
(MHz)
Modulation Services
Current GPS LIC/A 1575.42 2.046 BPSK Open
Future GPS LIC 1575.42 1.023 TMBOC(6,1,4/33)+BOC(1,1) Open


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