| Author |
Message |
Prashant B
Guest
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 Posted:
Fri Nov 25, 2005 5:08 pm Post subject:
Post Processing Software |
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I was going through the rinex observation files, and found that in some
data sets, some observations are missing. I am just wondering what a
post processing software would do when it encouters such missing data
or blank spaces?
This is important to me as i am in the process of reading data from
RINEX obs/nav files and do some post processing calculations.
Some of the possibilities that I could think of was
1. Skip the reading-- if it does then there are a lot of readings that
have to be skipped as i came across quite a considerable
number of data records missing.
2. Assume some values -- if so how does it assume the value |
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Preben Mikael Bohn
Guest
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| Posted:
Fri Nov 25, 2005 5:08 pm Post subject:
Re: Post Processing Software |
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Prashant B wrote:
| Quote: | I was going through the rinex observation files, and found that in some
data sets, some observations are missing. I am just wondering what a
post processing software would do when it encouters such missing data
or blank spaces?
This is important to me as i am in the process of reading data from
RINEX obs/nav files and do some post processing calculations.
Some of the possibilities that I could think of was
1. Skip the reading-- if it does then there are a lot of readings that
have to be skipped as i came across quite a considerable
number of data records missing.
2. Assume some values -- if so how does it assume the value
|
Not 2. Obviously it depends on your measurement scenario and what you
try to achieve. However if you are doing your own post processing SW
there is no need to invent "arbitrary" values where there is no data.
Best regards Preben |
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John
Guest
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| Posted:
Sun Nov 27, 2005 12:03 am Post subject:
Re: Post Processing Software |
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The big question: were there any phase slips in the missing data? If
there were no slips, then you can ignore the missing data and keep on
going.
With Rinex data, if you lose the observation, you also lose the slip
flags. The processing software will need to check for slips by looking
for inconsistencies in the observations.
For your own software, you could be conservative and treat missing
observations as "slips". Later, when you trust your software's slip
detection, you can attempt to continue tracking.
- John
BTW, Rtcm 104 data has is a "loss of lock" counter, so you can tell if
there was a slip even though you may have dropped intermediate data. |
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