u-blox ANTARIS 4 - Supersense GPS - Weak Signal GPS (TIM-4 H; LEA-4 H; TIM-4 S; LEA-4 S)..................................... 93


your position is our focus
u-bloxprovidesAlmanacPlus
®
datafilesindifferentsizes,whichcontaindifferentialalmanaccorrectionsthatare
tileFlashEPROM.
A
fflineworksinlocat nywirelessconnectivityasthecorrectiondatafilesresideinthe
r immedi nload
w llcharges.
 N NTARIS
®
4GPSre special
4.5.7 SuperSense
®
GPS - Weak Signal GPS (TIM-4H/ LEA-4H/ TIM-4S/ LEA-4S)
This section only applies to TIM-4H/TIM-4S, LEA-4H/LEA-4S and NEO-4S.
heSuperSense
®
technology drasticallyincreasesthe sensitivityofANTARIS
®
4GPSreceivers,therebyenhancing
S co
thoughnot
lsmuchlongerthanStandardGPS
receiversand can track down to levels close to -160dBm, which is about10dB better than what a ANTARIS
®
4
rdGPS
Automatic S
The SuperSense
®
 firmware automatically adjusts the sensitivity settings for best performance by applying
nnel depending on the signal strength. For an optimized startup
anothersensitivitymodemaybeconsidered(seeSection 4.5.8).
ationaccuracyunderdynamicconditionswill belower
forweakersignalsduetothelongintegrationtimebutalsoduetothefactthatSuperSensewill havetorelyon
reflectedsignalsinordertoachievepositionfixes(see Figure 80
).
validforaperiodofbetween1and14daysthereafter.Userscandownloadcorrectiondataanytimetheyhave
an Internetconnection, forexample athomeor in theoffice. TheGPS receiver storesthedownloaded data in
thenon-vola
ssistNow
®
O ionswithouta
eceiver.Thismakesthem atelyavailableuponstart-up,eliminatingconnectionset-updelays,dow
aitingtimesandca
ote: AllA ceiverswithFlashEPROMareAssistNow
®
Offlinecapablebutrequirea
firmware.
T
the GP verage in areas with obstructed sky view (e.g. urban canyons) and providing positioning in many
allindoorlocations.SuperSense
®
canintegratetheincomingsigna
Standa receivercando.
election of optimal Sensitivity
individual integration times for each cha
performance(i.e.automotiveapplications)
Accuracy and Dynamic Responsiveness
Inthepresenceofstrongsignals,theperformanceanddynamicresponsiveness
ofSuperSense
®
iscomparableto
StandardGPS receiverslikeTIM-4AorTIM-4P.Thenavig
6 SV in sight for Navigation
(3 direct, 3 reflected Signals)

3 SV in sight for Navigation

Figure 80: Direct line-of-sight versus reflected signals
GPSModules-SystemIntegrationManual(SIM)(incl.ReferenceDesign) ReceiverDescription
GPS.G4-MS4-05007-A1
  Page 93