CalcDOPs Application

Description

The CalcDOPsManual tool reads SV almanac data (one file per day of observation) from a FIC, FICA, or a RINEX navigation file, then computes and displays visibility information. Dilution of precision values from that data are calculated using standard methods.

Command Summary

CalcDOPs [options]

Required Arguments:

Short Arg.	Long Arg.	Description
`-i`		Input file for day to be calculated.

Optional Arguments:

Short Arg.	Long Arg.	Description
`-p`		Input file for previous day (ephemeris mode only).
`-o`		Grid output file (default DOPs.out).
`-sf`		Stats output file (default DOPS.stat).
`-tf`		Time steps output file (default DOPS.times).
`-l`		Log output file (default DOPS.log).
`-rs`		Read from stats file.
`-a`		Work in almanac mode (ephemeris mode is default).
`-w -s`		Starting time tag.
`-x`		Exclude satellite PRN.
`-t`		Time spacing.
`-na`		North America only.
`-d`		Dump grid results at each time step (time-intensive).
`-h`	--help	Output options info and exit.
`-v`		Print version info and exit.

Abort/failure error codes given on return:

-1	Could not open data file.
-2	Could not identify input data file type.
-3	Fewer than 4 satellite almanacs available.
-4	Could not allocate GridStats data types.
-5	Could not open input stats file.
-6	Could not open output grid file.
-7	Could not open output stats file.
-8	Could not open output log file.

Essential variables not documented below at declaration:

NtrofN	Number of cells/times with < 5 SVs visible during the time period.
NpeakH	Number of cells/times w/ HDOP > 10.
NpeakP	Number of cells/times w/ PDOP > 10.
IworstN	Index in Grid of cells with worst nsvs (number of satellites).
IworstH	Index in Grid of cells with worst HDOP.
IworstP	Index in Grid of cells with worst PDOP.
WorstN	Value of nsvs at IworstN.
WorstH	Value of HDOP at IworstH.
WorstP	Value of PDOP at IworstP.
TworstN	Time tag (CommonTime) of WorstN.
TworstH	Time tag (CommonTime) of WorstH.
TworstP	Time Tag (CommonTime) of WorstP.

Notes