u-blox ANTARIS 4 - Static Hold Mode

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Platform Description
Stationary
Timingapplications(antennamustbestationary)orotherstationaryapplications
• Velocityisconstrainedto0m/s
zerodynamics)• Noprocessnoise(assuming
Pedestrian
Applicationswithlowaccelerationsandlowspeed,asanyportabledevicescarriedand
elerations
movedbymanpower.
• Assuminglowacc
A tomotive
Usedforapplicationsthatcanbecomparedwiththedynamicsofa
u
passengercar.
• Assuminglowverticalacceleration
• Assuminglowprocessnoise
At se
Recommendedforapplicationsatsea,withzeroverticalvelocity.
• Assumingzeroverticalvelocity
a
• Assuminglowprocessnoise
Airborne <1g
Usedforapplicationsthathavetohandleahigherdynamicrangethanacarandhigher
verticalaccelerations.
in noise
ssupp
• Assuming
• No2Dpos
termediatepr
itionfixe
ocess
orted
Airborne <2g
d r vironment.
Assuminghighprocessno 
Recommende foratypicalai planeen
• ise
• No2Dpositionfixessupported
Airborne <4g
extremedynamicenvironment.
Assuminghighprocessno 
Onlyrecommendedforan
• ise
• No2Dpositionfixessupported
Table 29: Dynamic Platform odel
 Note Dynamic platforms designed for high acceleration systems (e.g. AIRBORNE < 2G) may result in a
tan rddeviation thereported sition.
4.6.4 Static Hold Mode
atic Hold mode  the navigation algorith  to decrea  the noise e pos  outp hen the
velocity is ned ‘Sta ic Hold Threshold’. This reduces th on der used by
environmental issues su lications.By
default,staticholdmod
disabled.
Function
tic HoldThreshold’,theposition iskeptconstant.Oncethe statichold
modehasbeenentered,thepositionandvelocityoutputwillkeptconstant,untilthereisevidenceofmovement.
Suchevidencecanbe velocity, acceleration,changesofthe validflag
(e.g.positionaccuray estimateexceeding
thePositionAccuracyMask,seealsosection4.6.8.1),positiondisplacement,etc.
Inolderfirmwareversions(<V5.0),thestaticholdmodewasreleaseifthespeedhadrisentotwicethevalueof
the‘StaticHoldThreshold’orifthereceiverhasmovedsignificantly.
M
greaters da in po
The St allows
re-defi
ms se

in th
e positi
ition
 wan
ut w
 ca below a p t
ch as multipath and improves positionaccuracy especially in stationary app
e
is
Ifthespeedgoesbelowthedefined ‘Sta
GPSModules-SystemIntegrationManual(SIM)(incl.ReferenceDesign) ReceiverDescription
GPS.G4-MS4-05007-A1
  Page 98