Jamie Condliffe
GPS is an utterly pervasive and wonderful technology, but it’s
increasingly not accurate enough for modern demands. Now a team
of researchers can make it accurate right down to an inch. ...
Read the complete article at http://gizmodo.com/a-new-technique-makes-gps-accurate-to-an-inch-1758457807
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=7349142
Integer ambiguity resolution is a challenging technical issue that
exists in real-time kinematic (RTK) global positioning system (GPS) navigation. Once the integer vector is resolved, centimeter-level
positioning estimation accuracy can be achieved using the GPS carrier
phase measurements. Recently, a real-time sliding window Bayesian
estimation approach to RTK GPS and inertial navigation was proposed
to provide reliable centimeter accurate-state estimation, via integer ambiguity resolution utilizing a prior along with all inertial
measurement unit and GPS measurements within the time window. One
challenge to implementing that approach in practice is the high
computation cost. This paper proposes a novel implementation approach
with significantly lower computational requirements and includes a
thorough theoretical analysis. The implementation results show that
the proposed method resolves an integer vector identical to that of
the original method and achieves state estimation with centimeter
global positioning accuracy.
Computationally Efficient Carrier Integer Ambiguity Resolution in
Multiepoch GPS/INS: A Common-Position-Shift Approach
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=7349142
Integer ambiguity resolution is a challenging technical issue that
exists in real-time kinematic (RTK) global positioning system (GPS)
navigation. Once the integer vector is resolved, centimeter-level
positioning estimation accuracy can be achieved using the GPS carrier
phase measurements. Recently, a real-time sliding window Bayesian
estimation approach to RTK GPS and inertial navigation was proposed
to provide reliable centimeter accurate-state estimation, via integer
ambiguity resolution utilizing a prior along with all inertial
measurement unit and GPS measurements within the time window. One
challenge to implementing that approach in practice is the high
computation cost. This paper proposes a novel implementation approach
with significantly lower computational requirements and includes a
thorough theoretical analysis. The implementation results show that
the proposed method resolves an integer vector identical to that of
the original method and achieves state estimation with centimeter
global positioning accuracy.
Promising.
Sam Wormley wrote:
Computationally Efficient Carrier Integer Ambiguity Resolution in
Multiepoch GPS/INS: A Common-Position-Shift Approach
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=7349142
Integer ambiguity resolution is a challenging technical issue that
exists in real-time kinematic (RTK) global positioning system (GPS)
navigation. Once the integer vector is resolved, centimeter-level
positioning estimation accuracy can be achieved using the GPS carrier
phase measurements. Recently, a real-time sliding window Bayesian
estimation approach to RTK GPS and inertial navigation was proposed
to provide reliable centimeter accurate-state estimation, via integer
ambiguity resolution utilizing a prior along with all inertial
measurement unit and GPS measurements within the time window. One
challenge to implementing that approach in practice is the high
computation cost. This paper proposes a novel implementation approach
with significantly lower computational requirements and includes a
thorough theoretical analysis. The implementation results show that
the proposed method resolves an integer vector identical to that of
the original method and achieves state estimation with centimeter
global positioning accuracy.
Promising.
Promising indeed, but if this is how they do it, i.e. effectively RTK
without a base station, then the absolute precision will not be improved
to the same degree.
I.e. you need some accurate reference at some point in time in order to enable carrier phase processing afaik.
On 2016-02-11 08:34, Hans-Georg Michna wrote:
Jamie Condliffe
GPS is an utterly pervasive and wonderful technology, but it's
increasingly not accurate enough for modern demands. Now a team
It's more accurate than its design goal. Not bad. Perhaps it should
solve the refugee crisis too? Or the financial crisis that will never end?
On 2016-02-15 07:12, Terje Mathisen wrote:
Promising indeed, but if this is how they do it, i.e. effectively RTK
without a base station, then the absolute precision will not be improved
to the same degree.
I.e. you need some accurate reference at some point in time in order to
enable carrier phase processing afaik.
Or even some manual update saying we are "here" to start the nav
(indeed, how INS' on aircraft work - or did before integration with GPS receivers - the pilot would enter the position of the starting gate
which is printed on the wall in front of the gate as well as in the gate
map of the airport (Jepp bag)).
Alan Browne wrote:
On 2016-02-15 07:12, Terje Mathisen wrote:
Promising indeed, but if this is how they do it, i.e. effectively RTK
without a base station, then the absolute precision will not be improved >>> to the same degree.
I.e. you need some accurate reference at some point in time in order to
enable carrier phase processing afaik.
Or even some manual update saying we are "here" to start the nav
(indeed, how INS' on aircraft work - or did before integration with GPS
receivers - the pilot would enter the position of the starting gate
which is printed on the wall in front of the gate as well as in the gate
map of the airport (Jepp bag)).
For cm-level accuracy you need at least the same baseline precision, something which is very hard to get unless you intentionally seek out
one of the reference markers.
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