[FOSS-GPS] Position modes in RTKPOST

[António Pestana]

Dear Mr. Takasu an other list members:


I am aware (not really aware, I've just heard off...) of the following
solutions to the positioning problem we are dealing with (GNSS positioning):

 a) Least mean square (LMS)

b) Weighted least mean square (WLMS)

c) Kalman filter

c.1) static positioning: coordinates of the receiver are constants and the
estimated clock offset of the receiver is white noise with zero mean

c.2) kinematic positioning for high receiver velocity: coordinates and
clock offset are modelled as zero mean white noise

c.3) kinematic positioning for low velocity: the coordinates are modelled
as a random walk

I think that a) and b) are not suitable to RTK positioning because of the
ill-conditioning of the design matrix (very short observation time spans,
frequently one solution per epoch). I'm I right?

If I'm right then it follows that in RTK we are using some sort of "Kalman
filter" type solutions. And if we are using "Kalman filters" type solutions
then the following questions arise:

1. RTKPOST "static" is like c.1)?

2. RTKPOST "kinematic" is like c.2) or c.3)?

3. And RTKPOST "single"? Is it LMS/WLMS?



Regards

Antonio



2011/10/28 Tomoji TAKASU <ttaka at yk.rim.or.jp>

> Dear Antonio
>
>
>  Can anyone explain give me a brief explanation regarding the differences
>> between the position modes options in RTKPOST? I am especially interested
>> in
>> the following modes: Single, Kinematic, Static, Moving-base and Fixed.
>>
>
> I think they are generally common terminologies
> among GNSS positioning area except for "Fixed".
>
> So see the manual and search by Google.
>
> "Fixed" is special in RTKLIB. In the mode, the user
> position is fixed to a priori values specified by user
> options and other parameters like ionosphere,
> troposphere are estimated. It is also used for the
> analysis of measurement noise and multi-path with
> residuals.
>
> regards,
>
> *********
> Tomoji TAKASU
>
> ------------------------------**--------------------
> From: "António Pestana" <afsm.pestana at gmail.com>
> Sent: Saturday, October 29, 2011 3:34 AM
> To: "Open Source GPS-related discussion and support" <
> foss-gps at lists.osgeo.org>
> Subject: [FOSS-GPS] Position modes in RTKPOST
>
>
>  Can anyone explain give me a brief explanation regarding the differences
>> between the position modes options in RTKPOST? I am especially interested
>> in
>> the following modes: Single, Kinematic, Static, Moving-base and Fixed.
>>
>> Regards
>>
>> Antonio
>>
>>
>
>
>  ______________________________**_________________
>> This message is sent to you from FOSS-GPS at lists.osgeo.org mailing list.
>> Visit http://lists.osgeo.org/**mailman/listinfo/foss-gps<http://lists.osgeo.org/mailman/listinfo/foss-gps>to manage your subscription
>> For more information, check http://wiki.osgeo.org/wiki/**FOSS-GPS<http://wiki.osgeo.org/wiki/FOSS-GPS>
>>
>>
>
> ______________________________**_________________
> This message is sent to you from FOSS-GPS at lists.osgeo.org mailing list.
> Visit http://lists.osgeo.org/**mailman/listinfo/foss-gps<http://lists.osgeo.org/mailman/listinfo/foss-gps>to manage your subscription
> For more information, check http://wiki.osgeo.org/wiki/**FOSS-GPS<http://wiki.osgeo.org/wiki/FOSS-GPS>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.osgeo.org/pipermail/foss-gps/attachments/20111031/e7abb9cf/attachment.html