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Bernese GPS Software Version 5.0 - Bernese GNSS Software

Bernese GPS Software Version 5.0 - Bernese GNSS Software

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9. Combination of Solutions<br />

9.4.2 General Options<br />

Primary input of ADDNEQ2 are one or several normal equation files that may be specified<br />

in panel “ADDNEQ2 1: Input Files”. On input the files are ordered chronologically according to<br />

their first epoch of validity (except if a SINEX output file is to be written, an alphabetical<br />

order of the solutions is kept).<br />

ADDNEQ2 allocates the necessary memory dynamically. But because the number of parameters<br />

in the combined normal equation is only known after reading and processing all<br />

input normal equations, the expected number of parameters in the combined solution is an<br />

input parameter (option “Maximum number of parameters in combined NEQ”, see Figure 9.6).<br />

ADDNEQ2 uses this option to allocate memory for the combined normal equation system.<br />

Specifying a number greater than necessary does no harm if the computer has enough<br />

memory.<br />

In panel “ADDNEQ2 3.1: Options 1” (see Figure 9.6) the a priori sigma of unit weight has to<br />

be specified. The unit weight usually corresponds to the weight of the zero-difference L1<br />

phase observable (at zenith) and should approximately agree with the actual measurement<br />

noise of the one-way L1 phase observations (the post-fit sigma of unit weight given in the<br />

ADDNEQ2 output file). In the same way as for program <strong>GPS</strong>EST (see Section 7.4.1) the<br />

value of this sigma is relevant only for the correct scaling of any a priori constraints put on<br />

specific parameters.<br />

In the same panel parameter pre-elimination (see Section 9.4.4), changing of parameter<br />

spacing (see Section 9.4.5), estimation of site velocities (see Section 10.3.4), and estimation<br />

of geocenter coordinates (see Section 15.4) may be enabled. The first two switches activate<br />

additional panels allowing to further specify the requests.<br />

Figure 9.6: General options for program ADDNEQ2 (1).<br />

Page 198 AIUB

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