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SPSx51 Modular GPS Receivers User Guide 139
GSOF Messages B
DOUBLE
The
DOUBLE data type is stored in the IEEE double-precision format which is 64 bits
long. The most significant bit is the sign bit, the next 11 most significant bits are the
exponent field, and the remaining 52 bits are the fractional field. The bias of the
exponent is 1023. The range of single precision format values is from 2.23
× 10
–308
to
1.8
× 10
308
. The floating-point number is precise to 15 decimal digits.
0 000 0000 0000 0000 0000 ... 0000 0000 0000 = 0.0
0 011 1111 1111 0000 0000 ... 0000 0000 0000 = 1.0
1 011 1111 1110 0110 0000 ... 0000 0000 0000 = -0.6875
1 111 1111 1111 1111 1111 ... 1111 1111 1111 = NaN
GSOF message definitions
When GSOF output is enabled, the following messages can be generated.
S Exp. + Bias Fraction
63 62 52
51 0