Ashtech Z-sensor Manual do Utilizador descarregar pdf (Página 2)

Presented at ION-GPS 97, Kansas City, MO. ÒNew Product DescriptionsÓ Session.

GPS - a tape measure

from space

Code

Carrier

1,5401,540

Tape measure from space

300m

600m

Code gives tick-marks

~every 300m, with

labels for each tick

Carrier gives tick marks ~every 20 centimeters

but with no labels

The GPS satellites provide the equivalent of a tape measure from space. The tape has labeled tick-marks at ~300m

intervals (the code), as well as unlabelled tick-marks at ~20cm intervals (the carrier). A receiver can measure the code

to 1m precision, and the carrier to one centimeter precision. A receiver that can compute the ÔlabelsÕ on the carrier

can then deliver centimeter position accuracy. This is what RTK receivers do.

What about GLONASS? GLONASS is the Russian GPS, and is almost identical in operation to the United States GPS.

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