Dear Mr. Takasu Once again I must thank you for your patience and kindness.
Regarding your answer to my questions: 1. Yes, you are right: I mean "least square". 2. By EKF are you referring to "extended Kalman filter"? I suppose that "extended Kalman filter" is KF applied to non-linear mathematical models. Am I right? Best regards Antonio > 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? >> > > Not right. > KF can handle only one epoch observations > (but usually has no meaning). LS or KF is just > a design selection. > > > > > 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? >> > > In "single", RTKPOST uses weighted LS. > In other modes, RTKPOST uses EKF. > > > regards, > > ********* > Tomoji TAKASU > > ------------------------------**-------------------- > From: "António Pestana" <[email protected]> > Sent: Tuesday, November 01, 2011 6:48 AM > > To: "Open Source GPS-related discussion and support" < > [email protected]> > Subject: Re: [FOSS-GPS] Position modes in RTKPOST > > 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 <[email protected]> >> >> 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" <[email protected]> >>> Sent: Saturday, October 29, 2011 3:34 AM >>> To: "Open Source GPS-related discussion and support" < >>> [email protected]> >>> 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 [email protected] mailing list. >>>> Visit >>>> http://lists.osgeo.org/****mailman/listinfo/foss-gps<http://lists.osgeo.org/**mailman/listinfo/foss-gps> >>>> <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> >>>> <http://wiki.osgeo.**org/wiki/FOSS-GPS<http://wiki.osgeo.org/wiki/FOSS-GPS> >>>> > >>>> >>>> >>>> >>> ______________________________****_________________ >>> >>> This message is sent to you from [email protected] mailing list. >>> Visit >>> http://lists.osgeo.org/****mailman/listinfo/foss-gps<http://lists.osgeo.org/**mailman/listinfo/foss-gps> >>> <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> >>> <http://wiki.osgeo.**org/wiki/FOSS-GPS<http://wiki.osgeo.org/wiki/FOSS-GPS> >>> > >>> >>> >> > > > ______________________________**_________________ >> This message is sent to you from [email protected] 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 [email protected] 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> >
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