ADU2 datasheet(62/162 Pages) ETC

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Page 50

ADU2 Operation and Reference Manual

Baseline to be processed (0 for all bl’s)

There are three baselines for which the calibration

program tries to solve the double difference phase

ambiguities, thus providing accurate relative position

vectors. Antennas 1 and 2 form baseline 1, 1 and 3 form

baseline 2, and 1 and 4 form baseline 3. By default (0), you

usually want to process all the baselines to determine all

three relative antenna position vectors. In the case where

only one baseline needs to be determined, specify the

appropriate baseline number.

Ambiguity search region

Range of integer ambiguities (positive and negative) that

the search routine searches around an initial ambiguity

estimate to find the correct set of ambiguities. This initial

ambiguity estimate is provided by a Kalman filter. The

program can handle a maximum search range of ± 9.

User-defined good period in secs

Shortest period required in which five satellites must be

tracked continuously. The B-file must have at least this

many seconds of uninterrupted satellite measurement data

in order to fix the ambiguities successfully, that is, no

cycle-slips. Initial testing shows that this number should

be an absolute minimum of 900.0 seconds. The default

good period is 0.5 hour (1800.0 seconds).

Minimum covariance to fix

ambiguities

The minimum covariance is used only in Option C of the

calibration program. Altering the covariance from the

default value requires some experience with the collected

data and the Kalman filter used in the program.

Minimum contrast to fix ambiguities

The minimum contrast is used only in Option C of the

calibration program. Altering the contrast from the default

value requires some experience with the collected data and

the Kalman filter used in the program.

Minimum contrast to modify estimate

Contrast is used only in Option C of the calibration

program. Altering the contrast from the default value

requires some experience with the collected data and the

Kalman filter used in the program.

Process noise for the state vectors

Part of the system noise and measurement noise

description for the Kalman filter. The default values for

these have been chosen based on experience with the data

collected by the ADU2 receiver.

Table 4.4: Run-Time Parameters Descriptions (continued)

Run-Time Parameter

Description

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