ADU2 datasheet(74/162 Pages) ETC

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Page 62

ADU2 Operation and Reference Manual

Measurement quality (Good/bad

flag)

indicates the quality in the measurement of position.

0 = measurement not available and no additional data will be

sent

22 = code and/or carrier phase measured

23 = code and/or carrier phase measured, and navigation

message was obtained but measurement was not used to

compute position.

24 = code and/or carrier phase measured, navigation message

was obtained, and measurement was used to compute position.

Polarity known flag

shows synchronization stage of receiver with NAV message

0 = looking for data bit transition

1 = looking for valid data bit

2 = looking for subframe preamble

3 = reading subframe ID

4 = waiting for first subframe ID

5 = receiver completely synchronized to NAV message

Signal to noise ratio (signal/noise)

high signal level with low noise level indicates good quality

signal. Typical range 15 to 130.

Phase quality indicator (%)

to obtain this value, an equation using carrier phase and

integrated doppler is computed. The result should be a value

close to an integer. Values from 0 to 5 or 95 to 100 indicate

good quality.

Full carrier phase (in cycles)

total number of cycles plus fraction of the range between the

antenna and the satellite.

Code transmit time (ms)

length of time of code transmission (t or pseudorange). The

satellite clock offset correction from GPS time is not included.

Doppler (10

-4 Hz)

doppler measurement.To get doppler in units of Hz, divide this

number by 10,000. Doppler is positive when the satellite is

moving away from the antenna, negative if it is moving

toward.

Range smoothing correction (in

meters)

raw range minus smoothed range. The smoothed range is

obtained by filtering the raw range with the integrated doppler.

Range smoothing quality

indicates how long the raw range has been smoothed.

Footer

Checksum (displayed in decimal)

a bytewise exclusive OR (xor) on all bytes from the sequence

tag to the checksum.

Table 5.8: MBEN Data in ASCII (continued)

Variable

Description

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