ADU2 datasheet(47/162 Pages) ETC

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Antenna Calibration

Page 35

10. Type n to enter calibration mode, and ADULOG starts collecting the data.

11. Continue collecting the data for at 1east one hour. This ensures the collection

of 30 minutes of cycle-slip free measurements.

12. After collecting the data, press <Esc> to stop collecting the data.

13. Press <Esc> a second time to exit ADULOG. At prompt message, type y.

14. Verify the B- E- and A- files exist in the working directory by typing dir.

Only B- and E-files are needed for calibration. The first letter of each file

name designates the file type.

Determine Relative Antenna Positions

After the data has been collected the relative vectors need to be computed. CALI3DF

computes highly accurate relative position vectors for the four antennas and does not

require the vehicle to be stationary. It achieves this by employing double differencing

techniques, a Kalman filter, and an ambiguity search method. Refer to references

[1,2] listed in Appendix C for an explanation of double differencing and phase

ambiguity resolution. Reference [3] provides a theoretical description of the Dynamic

Calibration.

Start CALI3DF by typing cali3df <ENTER> at the DOS prompt. The

Select B-File for Calibration screen opens (Figure 4.4).

It is not necessary to use SPLIT3DF before running the dynamic calibration software. CALI3DF

completes this operation.

Figure 4.4: Select B-File for Calibration

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