Ashtech Z-sensor Manual do Utilizador descarregar pdf (Página 5)

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

40%

50%

60%

70%

80%

90%

100%

1 10 100 1000

Time since reset (seconds)

Perc

GG-RTK Receiver, RTK intialization, int.-fixing

phase . Short, Medium and Long baseli n es

The above data was all collected with the default

reliability setting, which is: formal reliability = 99%. In

both cases (Z and GG-RTK) the achieved reliability

exceeded the formal reliability.

The results show two things very clearly:

1. For short baselines GG-RT K is much faster than

dual-frequency GPS-only RTK, with integer-fixing

initialization occuring within 1.5 seconds in 50%

of tests.

2. For longer baselines dual-frequency GPS-only RT K

is fast er t han GG-RT K.

What about float ing point accuracy? T he following

plot shows the typical behavior seen when the GG-

RT K receiver does take a long time to fix integers. In

this example the receiver took 11 minutes to fix

integers on a 7km baseline, but the floating point

accuracy converged to 20 centimeters within a few

minutes - ideal performance for applications requiring

10-20 cm aaccuracy levels, such as guidance and

machine control.

0.2

0.4

0.6

0.8

1.2

123 456 78910111213

Time since reset (minutes)

Hori

Float solution convergence of GG-RTK

Once the solution is fixed, horizontal accuracy is 1cm

1s with degradation of 1 part per million on long

baselines. A GPS paper wouldnÕt be complet e wit hout a

scatter plot showing accuracy, and so here it is:

This plot was obtained from 12 hours of GG-RTK

position data, with a short baseline. In this example the

accuracy is well better than the specified accuracy. The

horizontal rms accuracy of these RTK positions is

0.5cm. The worst case error is 1.3cm

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