[FOSS-GPS] 回复：Re: RTKLIB FIX solution - Hold problem
hexiaoxing at whu.edu.cn
Thu Oct 23 17:21:42 PDT 2014
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Yanqing <fishloveocean at gmail.com>编写：
>Minimum fix count is the number of fixed epochs before the integer ambiguities being used to fix the baseline.
>> On 15 Oct 2014, at 20:51, David Kelley <DavidKelley at ITSware.net> wrote:
>> "Minimum Fix Count" ? I do not understand the question.
>> Perhaps you meant the AR ratio?, RTKLIB calls this the "Min. Ratio to Fix Ambiguity"
>> If that is correct, and you wish to be "generous" at the expense of increasing the overall probability of a false Ambiguity Resolution fix (selecting the wrong set of integers result in an incorrect position), then use a value like 2.7 or so. Do not go much lower.
>> [ My limited experience with RTKLIB on this is to leave the value alone and it does a very good job using a classic comparison of the ratios method. However this is clearly an area where the tool can be improved, but I would not expect such improvements to become easily available as open source. For those that care, the optimal AR process is a very complex topic, see https://www.ion.org/publications/search.cfm?searchText=+Ambiguity+Resolution for a good summary of the key literature, but again now you are into things rather deep ]
>> Regards, David Kelley
>>> On 10/15/2014 12:36 AM, jeremy.bouathong wrote:
>>> Hi David,
>>> thanks for your advice. Do you know what is exactly the Minimum Fix Count to
>>> Hold the Ambiguity?
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