T. Sakai, H. Yamada, and K. Ito Electronic Navigation Research Institute, Japan T. Sakai, H. Yamada, and K. Ito Electronic Navigation Research Institute,

T. Sakai, H. Yamada, and K. ItoElectronic Navigation Research Institute, Japan

T. Sakai, H. Yamada, and K. ItoElectronic Navigation Research Institute, Japan

Ranging Quality ofQZSS L1-SAIF Signal

Ranging Quality ofQZSS L1-SAIF Signal

ION ITM 2012ION ITM 2012Newport Beach, CANewport Beach, CAJan.30 - Feb.1, 2012Jan.30 - Feb.1, 2012

ION ITM 30 Jan.-1 Feb. 2012 - ENRIION ITM 30 Jan.-1 Feb. 2012 - ENRI

SSLIDELIDE 22IntroductionIntroduction

• QZSS (Quasi-Zenith Satellite System) programQZSS (Quasi-Zenith Satellite System) program::– Regional navigation service broadcast from high-elevation angle by a combination Regional navigation service broadcast from high-elevation angle by a combination

of three satellites on the inclined geosynchronous (quasi-zenith) orbit;of three satellites on the inclined geosynchronous (quasi-zenith) orbit;– Broadcast GPS-like supplemental signals on three frequencies and two augmentatiBroadcast GPS-like supplemental signals on three frequencies and two augmentati

on signals, L1-SAIF and LEX;on signals, L1-SAIF and LEX;– The first QZS satellite was successfully launched on Sept. 11, 2010.The first QZS satellite was successfully launched on Sept. 11, 2010.

• L1-SAIF L1-SAIF (Submeter-class Augmentation with Integrity Function) (Submeter-class Augmentation with Integrity Function) signal offers:signal offers:– Submeter accuracy wide-area differential correction service;Submeter accuracy wide-area differential correction service;– Integrity function for safety of mobile users; andIntegrity function for safety of mobile users; and– Ranging functionRanging function for improving position availability; all on L1 single frequency. for improving position availability; all on L1 single frequency.

• ENRI has been developing L1-SAIF signal and experimental facilityENRI has been developing L1-SAIF signal and experimental facility::– Signal design: SBAS-like message stream on L1 C/A code (PRN 183);Signal design: SBAS-like message stream on L1 C/A code (PRN 183);– Ranging function is now available: Ephemeris information has been broadcast duriRanging function is now available: Ephemeris information has been broadcast duri

ng the experiments conducted by ENRI since Nov. 2011;ng the experiments conducted by ENRI since Nov. 2011;– Investigated ranging quality of L1-SAIF signal.Investigated ranging quality of L1-SAIF signal.

Expect comparable to GPS thanks to signal bandwidth of 24 MHz.Expect comparable to GPS thanks to signal bandwidth of 24 MHz.


SSLIDELIDE 33QZSS ConceptQZSS Concept

• Broadcast signal from high elevation angle;Broadcast signal from high elevation angle;

• Applicable to navigation services for Applicable to navigation services for mountain area and urban canyon;mountain area and urban canyon;

• Augmentation signal from the zenith could Augmentation signal from the zenith could help users to acquire other GPS satellites at help users to acquire other GPS satellites at any time.any time.

• Footprint of QZSS orbit;Footprint of QZSS orbit;• Centered at 135E;Centered at 135E;• Eccentricity 0.075, Inclination 43deg.Eccentricity 0.075, Inclination 43deg.

QZSQZSGPS/GEOGPS/GEO


SSLIDELIDE 44Inclined Geosynchronous OrbitInclined Geosynchronous Orbit

Ground Track

• Semi-major axis (42164km) is equal to GEO orbit: synchronous with rotation of Semi-major axis (42164km) is equal to GEO orbit: synchronous with rotation of the earth;the earth;

• Inclined obit makes ground track ‘8’-figure; Called IGSO or Quasi-Zenith Orbit;Inclined obit makes ground track ‘8’-figure; Called IGSO or Quasi-Zenith Orbit;• With three or more satellites on the same ground track, navigation service can With three or more satellites on the same ground track, navigation service can

be provided from the zenith to regional users at any time.be provided from the zenith to regional users at any time.

Orbital Planes of QZSS (3 SVs)

8:408:40

15:2015:20Perigee Perigee

32000km32000km

ApogeeApogee40000km40000km


SSLIDELIDE 55

L-band Helical Array Antenna

L1-SAIF Antenna

Laser Reflector

C-band TTC Antenna

Radiation Cooled TWTTWSTFT Antenna

25.3m

Successfully launched on Sept. Successfully launched on Sept. 11, 2010 and settled on Quasi-Z11, 2010 and settled on Quasi-Zenith Orbit (IGSO).enith Orbit (IGSO).

Nickname: “Michibiki”Nickname: “Michibiki”

Space Segment: QZS-1Space Segment: QZS-1

Mass4,020kg (wet) 1,802kg (dry) (NAV Payload： 320kg)

PowerApprox. 5.3 kW (EOL) (NAV Payload: Approx. 1.9kW)

Design Life 10 years


SSLIDELIDE 66QZSS Frequency PlanQZSS Frequency Plan

Find detail in IS-QZSS document.Find detail in IS-QZSS document.

SignalSignal ChannelChannel FrequencyFrequency BandwidthBandwidth Min. Rx PowerMin. Rx Power

QZS-L1CQZS-L1CL1CDL1CD

1575.42 MHz1575.42 MHz

24 MHz24 MHz ––163.0 dBW163.0 dBW

L1CPL1CP 24 MHz24 MHz – – 158.25 dBW158.25 dBW

QZS-L1-C/AQZS-L1-C/A 24 MHz24 MHz – – 158.5 dBW158.5 dBW

QZS-L1-SAIFQZS-L1-SAIF 24 MHz24 MHz – – 161.0 dBW161.0 dBW

QZS-L2CQZS-L2C 1227.6 MHz1227.6 MHz 24 MHz24 MHz – – 160.0 dBW160.0 dBW

QZS-L5QZS-L5L5IL5I

1176.45 MHz1176.45 MHz25 MHz25 MHz – – 157.9 dBW157.9 dBW

L5QL5Q 25 MHz25 MHz – – 157.9 dBW157.9 dBW

QZS-LEXQZS-LEX 1278.75 MHz1278.75 MHz 42 MHz42 MHz – – 155.7 dBW155.7 dBW

InteroperabilityInteroperability

GPS-like supplemental GPS-like supplemental signals with minimum signals with minimum modifications from GPS modifications from GPS signalssignals

SBAS-like augmentation SBAS-like augmentation signal (250bps)signal (250bps)

QZSS-specific augmenta-tiQZSS-specific augmenta-tion signal (2kbps)on signal (2kbps)

1575.42 MHz1575.42 MHz


SSLIDELIDE 77

• QZSS broadcasts wide-area augmentation signalQZSS broadcasts wide-area augmentation signal::– Called L1-SAIF (Submeter-class Augmentation with Integrity Function);Called L1-SAIF (Submeter-class Augmentation with Integrity Function);

– Designed and developed by ENRI.Designed and developed by ENRI.

• L1-SAIF signal offersL1-SAIF signal offers::– Wide-area differential correction service for improving position accuracy; TargeWide-area differential correction service for improving position accuracy; Targe

t accuracy: 1 meter for horizontal;t accuracy: 1 meter for horizontal;

– Integrity function for safety of mobile users; andIntegrity function for safety of mobile users; and

– Ranging functionRanging function for improving position availability. for improving position availability.

• Augmentation to GPS L1C/A based on SBAS techniquesAugmentation to GPS L1C/A based on SBAS techniques::– Broadcast on L1 freq. with RHCP; Common antenna and RF front-end;Broadcast on L1 freq. with RHCP; Common antenna and RF front-end;

Modulated by BPSK with C/A code (PRN 183);Modulated by BPSK with C/A code (PRN 183); 250 bps data rate with 1/2 FEC; message structure is identical with SBAS;250 bps data rate with 1/2 FEC; message structure is identical with SBAS; Differences: Large Doppler and additional messages.Differences: Large Doppler and additional messages.

– Specification of L1-SAIF: See IS-QZSS document (Available at JAXA HP).Specification of L1-SAIF: See IS-QZSS document (Available at JAXA HP).

QZSS L1-SAIF SignalQZSS L1-SAIF Signal


SSLIDELIDE 88L1-SAIF SignalL1-SAIF Signal

User GPSUser GPSReceiversReceivers

• Three functions by a single signal: ranging, error Three functions by a single signal: ranging, error correction (Target accuracy: 1m), and integrity;correction (Target accuracy: 1m), and integrity;

• User receivers can receive both GPS and L1-SAIF User receivers can receive both GPS and L1-SAIF signals with a single antenna and RF front-end;signals with a single antenna and RF front-end;

• Message-oriented information transmission: flexible Message-oriented information transmission: flexible contents.contents.

SAIFSAIF ：： Submeter-class Augmentation with Integrity FunctionSubmeter-class Augmentation with Integrity Function

RangingRangingFunctionFunction

ErrorErrorCorrectionCorrection

IntegrityIntegrityFunctionFunction

QZS satellitesQZS satellites

GPS ConstellationGPS Constellation

Ranging SignalRanging Signal


SSLIDELIDE 99L1-SAIF CorrectionsL1-SAIF Corrections

• Example of user position error at Site 94Example of user position error at Site 940058 (Takayama: near center of monitor 0058 (Takayama: near center of monitor station network);station network);

• Realtime operation with MSAS-like 6 moRealtime operation with MSAS-like 6 monitor stations;nitor stations;

• Period: 19-23 Jan. 2008 (5 days);Period: 19-23 Jan. 2008 (5 days);• L1-SAIF provides corrections only;L1-SAIF provides corrections only;

No L1-SAIF ranging.No L1-SAIF ranging.

HorizontalHorizontalErrorError

VerticalVerticalErrorError

1.45 m1.45 m 2.92 m2.92 m

6.02 m6.02 m 8.45 m8.45 m

SystemSystem

StandaloneStandaloneGPSGPS

0.29 m0.29 m 0.39 m0.39 m

1.56 m1.56 m 2.57 m2.57 mL1-SAIFL1-SAIF

RMSRMS

MaxMax

RMSRMS

MaxMax

Note: Results shown here were obtained with survey-Note: Results shown here were obtained with survey-grade antenna and receiver in open sky condition.grade antenna and receiver in open sky condition.

Standalone GPSStandalone GPSAugmented by L1-SAIFAugmented by L1-SAIF

No L1-SAIF RangingNo L1-SAIF Ranging


SSLIDELIDE 1010Usage of L1-SAIF RangingUsage of L1-SAIF Ranging

• Ranging function of L1-SAIF signalRanging function of L1-SAIF signal::– RF signal design: Identical with GPS L1 C/A modulated by PRN 183 code;RF signal design: Identical with GPS L1 C/A modulated by PRN 183 code;– Necessary to broadcast ephemeris information in order to make ranging functioNecessary to broadcast ephemeris information in order to make ranging functio

n available to users.n available to users. L1-SAIF extended message of Type 58 Ephemeris Information is designed L1-SAIF extended message of Type 58 Ephemeris Information is designed

for this purpose.for this purpose.

• Completed L1-SAIF Master Station (L1SMS) upgradeCompleted L1-SAIF Master Station (L1SMS) upgrade::– To be capable of broadcasting MT58 Ephemeris Information during the experiTo be capable of broadcasting MT58 Ephemeris Information during the experi

ments conducted by ENRI;ments conducted by ENRI;– Using JAXA monitor stations for generation of MT58.Using JAXA monitor stations for generation of MT58.

• Investigation of ranging quality including effects of Ephemeris InformationInvestigation of ranging quality including effects of Ephemeris Information::– RF quality: Expect comparable to GPS thanks to signal bandwidth of 24MHz;RF quality: Expect comparable to GPS thanks to signal bandwidth of 24MHz;– How about quality of ephemeris information on L1-SAIF ?How about quality of ephemeris information on L1-SAIF ?– User receiver setup:User receiver setup:

JAVAD ALPHA-G3T with QZSS extension;JAVAD ALPHA-G3T with QZSS extension; Output pseudorange measurements are processed by ENRI;Output pseudorange measurements are processed by ENRI; 5 deg Elevation Mask, 100 seconds Carrier Smoothing.5 deg Elevation Mask, 100 seconds Carrier Smoothing.


SSLIDELIDE 1111L1-SAIF Message StructureL1-SAIF Message Structure

PreamblePreamble8 bits8 bits

Message TypeMessage Type6 bits6 bits

Data FieldData Field212 bits212 bits

CRC parityCRC parity24 bits24 bits

1 message = 250 bits broadcast every second

MTMT

00

11

2 to 52 to 5

66

77

99

1010

1212

1717

1818

ContentsContents

Test modeTest mode

PRN maskPRN mask

Fast correction & UDREFast correction & UDRE

UDREUDRE

Degradation factor for FCDegradation factor for FC

GEO ephemerisGEO ephemeris

Degradation parameterDegradation parameter

SBAS time informationSBAS time information

GEO almanacGEO almanac

IGP maskIGP mask

IntervalInterval[s][s]

66

120120

6060

66

120120

120120

120120

300300

300300

300300

2424

2525

2626

2727

2828

6363

FC & LTCFC & LTC

Long-term correctionLong-term correction

Ionospheric delay & GIVEIonospheric delay & GIVE

SBAS service messageSBAS service message

Clock-ephemeris covarianceClock-ephemeris covariance

Null messageNull message

66

120120

300300

300300

120120

——

MTMT ContentsContents IntervalInterval[s][s]

Transmitted FirstTransmitted First


SSLIDELIDE 1212L1-SAIF Message (1)L1-SAIF Message (1)

Message TypeMessage Type ContentsContents Used byUsed by StatusStatus

00 Test modeTest mode SBAS and L1-SAIFSBAS and L1-SAIF FixedFixed

11 PRN maskPRN mask FixedFixed

2 to 52 to 5 Fast correction & UDREFast correction & UDRE FixedFixed

66 UDREUDRE FixedFixed

77 Degradation factor for FCDegradation factor for FC FixedFixed

1010 Degradation parameterDegradation parameter FixedFixed

1818 IGP maskIGP mask FixedFixed

2424 Mixed fast/long-term correctionMixed fast/long-term correction FixedFixed

2525 Long-term correctionLong-term correction FixedFixed

2626 Ionospheric delay & GIVEIonospheric delay & GIVE FixedFixed

99 GEO ephemerisGEO ephemeris SBASSBAS FixedFixed

1717 GEO almanacGEO almanac SBASSBAS FixedFixed

1212 SBAS network timeSBAS network time SBASSBAS FixedFixed

SBAS and L1-SAIFSBAS and L1-SAIF









88 ReservedReserved SBASSBAS FixedFixed


SSLIDELIDE 1313L1-SAIF Message (2)L1-SAIF Message (2)

Message TypeMessage Type ContentsContents Used byUsed by StatusStatus

2727 SBAS service messageSBAS service message SBASSBAS FixedFixed

29 to 5129 to 51 UndefinedUndefined —— ——

2828 Clock-ephemeris covarianceClock-ephemeris covariance SBAS and L1-SAIFSBAS and L1-SAIF FixedFixed

6262 ReservedReserved SBAS and L1-SAIFSBAS and L1-SAIF FixedFixed

6363 Null messageNull message SBAS and L1-SAIFSBAS and L1-SAIF FixedFixed

5252 TGP maskTGP mask L1-SAIFL1-SAIF TentativeTentative

5656 Intersignal biasesIntersignal biases L1-SAIFL1-SAIF TentativeTentative

5757 Ephemeris-related parameterEphemeris-related parameter L1-SAIFL1-SAIF TBDTBD

5858 QZS ephemerisQZS ephemeris L1-SAIFL1-SAIF TentativeTentative

5959 QZS almanacQZS almanac L1-SAIFL1-SAIF TBDTBD

6060 Regional informationRegional information L1-SAIFL1-SAIF TBDTBD

6161 ReservedReserved L1-SAIFL1-SAIF TentativeTentative

5353 Tropospheric delayTropospheric delay L1-SAIFL1-SAIF TentativeTentative

54 to 5554 to 55 Advanced Ionospheric delayAdvanced Ionospheric delay L1-SAIFL1-SAIF TBDTBD


SSLIDELIDE 1414L1-SAIF Ephemeris (MT58)L1-SAIF Ephemeris (MT58)

Item Bits Range Resolution Contents

t0,Q 8 0-10740 s 60 s Epoch time/IODN

URA 4 0-15 1 Accuracy indicator

x 26 42950 km 1.28 m Position X in ECEF

y 26 42950 km 1.28 m Position Y in ECEF

z 26 42950 km 1.28 m Position Z in ECEF

vx 24 4.194 km/s 0.5 mm/s Velocity X in ECEF

vy 24 4.194 km/s 0.5 mm/s Velocity Y in ECEF

vz 24 4.194 km/s 0.5 mm/s Velocity Z in ECEF

5 32 m/s2 2 m/s2 Acceleration X in ECEF (only perturbation)

5 32 m/s2 2 m/s2 Acceleration Y in ECEF (only perturbation)

5 32 m/s2 2 m/s2 Acceleration Z in ECEF (only perturbation)

aGf0 22 1.953 ms 2-30 s Clock correction, offset

aGf1 13 3.725 ns/s 2-40 s/s Clock correction, drift

Total 212 Stored in 1 message (1sec)

xx

yy

zz

....

....

....


SSLIDELIDE 1515Generation of EphemerisGeneration of Ephemeris

• Ephemeris information is generated based on reconstruction from MCS products broEphemeris information is generated based on reconstruction from MCS products broadcast on QZS-L1-C/A (PRN 193):adcast on QZS-L1-C/A (PRN 193):

L1SMS receives L1 C/A Nav message and extract QZS-1 PVA for generation of MT58.L1SMS receives L1 C/A Nav message and extract QZS-1 PVA for generation of MT58.

• Users do not need to receive any signals other than L1-SAIF (PRN 183).Users do not need to receive any signals other than L1-SAIF (PRN 183).

DecodeDecodeephemerisephemeris

ComputeComputePVAPVA

FormatFormatinto MT58into MT58

QZS-L1C

/A (P

RN 193

)

QZS-L1C

/A (P

RN 193

)

Ephem

eris

in Le

gacy

Nav

Ephem

eris

in Le

gacy

Nav

L1-SAIF (PRN 183)

L1-SAIF (PRN 183)

Ephemeris in MT58

Ephemeris in MT58

L1-SAIF Master Station (L1SMS) at ENRIL1-SAIF Master Station (L1SMS) at ENRI

JAXA MCSJAXA MCSQZ

S-L

1C/A

QZ

S-L

1C/A Uplink

Uplink

Ephemeris ReconstructionEphemeris ReconstructionL1-C/A UsersL1-C/A Users

L1-SAIF UsersL1-SAIF Users

QZS-1QZS-1

No need to receiveNo need to receiveQZS-L1-C/A (PRN 193)QZS-L1-C/A (PRN 193)


SSLIDELIDE 1616SV Position Error of MT58SV Position Error of MT58

• Integration error in user receiver with regard to time after broadcast of Integration error in user receiver with regard to time after broadcast of MT58 with LTC (long-term correction) in MT24/25 messages;MT58 with LTC (long-term correction) in MT24/25 messages;

• Range error is within 0.3m for 300 seconds integration. Range error is within 0.3m for 300 seconds integration. Note that ephemeris message of SBAS has timeout interval of 240-360s.Note that ephemeris message of SBAS has timeout interval of 240-360s.

QZS-1QZS-1Reconstructed fromReconstructed frombroadcast Nav Msgbroadcast Nav Msgon L1C/A PRN 193on L1C/A PRN 193

2011-08-182011-08-1800:00 to 24:00 GPST00:00 to 24:00 GPST

Processing by ENRIProcessing by ENRI

Assumed user location:Assumed user location: @ENRI, Tokyo@ENRI, Tokyo


SSLIDELIDE 1717User Receiver SetupUser Receiver Setup

JAVAD ALPHA-G3T with QZSS extensionJAVAD ALPHA-G3T with QZSS extension


SSLIDELIDE 1818HPE w/L1-SAIF RangingHPE w/L1-SAIF Ranging

2011-08-182011-08-1802:18:45 to 21:16:2002:18:45 to 21:16:20

L1-SAIF (PRN183) Ranging ONL1-SAIF (PRN183) Ranging ON

L1SMS Configuration:L1SMS Configuration: 6 DF GPS GMS (GEONET)6 DF GPS GMS (GEONET) 4 SF GPS/QZS GMS (JAXA)4 SF GPS/QZS GMS (JAXA)

User location:User location: @ENRI, Tokyo@ENRI, Tokyo

Receiver:Receiver: JAVAD ALPHA-G3TJAVAD ALPHA-G3T

Processing by ENRIProcessing by ENRI Mask 5deg, Smoothing 100sMask 5deg, Smoothing 100s

L1-SAIF CorrectionL1-SAIF Correction L1-SAIF RangingL1-SAIF Ranging Hor RMSHor RMS Hor MaxHor Max Ver RMSVer RMS Ver MaxVer Max

OFFOFFOFFOFF 1.809 m1.809 m 6.241 m6.241 m 2.673 m2.673 m 7.187 m7.187 m

ONON 1.403 m1.403 m 8.982 m8.982 m 3.714 m3.714 m 15.196 m15.196 m

ONONOFFOFF 0.680 m0.680 m 8.686 m8.686 m 0.988 m0.988 m 13.308 m13.308 m

ONON 0.658 m0.658 m 2.494 m2.494 m 0.937 m0.937 m 4.682 m4.682 m


SSLIDELIDE 1919HPE w/o L1-SAIF RangingHPE w/o L1-SAIF Ranging

L1-SAIF CorrectionL1-SAIF Correction L1-SAIF RangingL1-SAIF Ranging Hor RMSHor RMS Hor MaxHor Max Ver RMSVer RMS Ver MaxVer Max

OFFOFFOFFOFF 1.809 m1.809 m 6.241 m6.241 m 2.673 m2.673 m 7.187 m7.187 m

ONON 1.403 m1.403 m 8.982 m8.982 m 3.714 m3.714 m 15.196 m15.196 m

ONONOFFOFF 0.680 m0.680 m 8.686 m8.686 m 0.988 m0.988 m 13.308 m13.308 m

ONON 0.658 m0.658 m 2.494 m2.494 m 0.937 m0.937 m 4.682 m4.682 m

2011-08-182011-08-1802:18:45 to 21:16:2002:18:45 to 21:16:20

L1-SAIF (PRN183) Ranging OFFL1-SAIF (PRN183) Ranging OFF






SSLIDELIDE 2020Observed ResidualsObserved Residuals

2011-08-182011-08-1802:18:45 to 21:16:2002:18:45 to 21:16:20

L1-SAIF Correction ONL1-SAIF Correction ON





• Residual error dependents upon elevation angle for GPS satellites;Residual error dependents upon elevation angle for GPS satellites;• L1-SAIF: Looks small dependency.L1-SAIF: Looks small dependency.


SSLIDELIDE 2121Observed ResidualsObserved Residuals

2011-08-182011-08-1802:18:45 to 21:16:2002:18:45 to 21:16:20






• PRN 3 operates with Cs AFS; PRN 6 with Rb AFS;PRN 3 operates with Cs AFS; PRN 6 with Rb AFS;• L1-SAIF is comparable to GPS signal; A bit noisy at high elevation.L1-SAIF is comparable to GPS signal; A bit noisy at high elevation.


SSLIDELIDE 2222Residuals on L1-SAIFResiduals on L1-SAIF

• Residual error within 1.8m from low to high elevation angle; 0.44m RMS;Residual error within 1.8m from low to high elevation angle; 0.44m RMS;• Observed a small uncorrected bias.Observed a small uncorrected bias.

2011-08-182011-08-1802:18:45 to 21:16:2002:18:45 to 21:16:20







SSLIDELIDE 2323Residuals on GPSResiduals on GPS

• RMS of residual error: 0.4 to 0.5m for GPS satellites;RMS of residual error: 0.4 to 0.5m for GPS satellites;• Largely biased.Largely biased.

PRN 3 with Cs AFSPRN 3 with Cs AFS PRN 6 with Rb AFSPRN 6 with Rb AFS


SSLIDELIDE 2424Continuous ObservationContinuous Observation

• ENRI has been conducting continuous observation of L1-SAIF signal for technical vENRI has been conducting continuous observation of L1-SAIF signal for technical verification since October 2011; Also observes other supplement signals;erification since October 2011; Also observes other supplement signals;

• Observation is available on the web: URL Observation is available on the web: URL http://www.enri.go.jp/sat/qzss_e.htmhttp://www.enri.go.jp/sat/qzss_e.htm• Range measurements are converted into RINEX format and navigation message is Range measurements are converted into RINEX format and navigation message is

formatted in EMS file; Both are slightly extended for QZSS;formatted in EMS file; Both are slightly extended for QZSS; Identifier: ‘J01’ for L1C/A and ‘S83’ for L1-SAIF.Identifier: ‘J01’ for L1C/A and ‘S83’ for L1-SAIF.

• Data files are stored on daily basis.Data files are stored on daily basis.

Receiver JAVAD ALPHA-G3T

Antenna

Location

ENRI, Tokyo - Top of the tower of No. 6 Building

35.679518936N 139.560964491E 109.1971m from ellipsoid

X=-3947737.9910 Y=3364428.7640 Z=3699428.9764

Antenna Trimble Zephyr Geodetic 2 (L1/L2/L5)

Target SV GPS, GLONASS, SBAS, QZSS (incl. L1-SAIF)

Measurements Code Range, Carrier Range, Doppler, C/N0 (L1, L2, L5)

Note - Sometimes there is missing data due to some reason such as power outage.Note - Sometimes there is missing data due to some reason such as power outage.


SSLIDELIDE 2525QZSS L1-SAIF Data SourceQZSS L1-SAIF Data Source

• URL URL http://www.enri.go.jp/sat/qzss_e.htmhttp://www.enri.go.jp/sat/qzss_e.htm • General Information, RINEX observation, EMS message archive, and schedule of LGeneral Information, RINEX observation, EMS message archive, and schedule of L

1-SAIF experiments by ENRI1-SAIF experiments by ENRI

QZSS L1-SAIF General InformationQZSS L1-SAIF General Informationhttp://www.enri.go.jp/sat/qzss_e.htmhttp://www.enri.go.jp/sat/qzss_e.htm

List of RINEX FilesList of RINEX Fileshttp://www.enri.go.jp/cnspub/sat/data/rinex/http://www.enri.go.jp/cnspub/sat/data/rinex/


SSLIDELIDE 2626ConclusionConclusion

• ENRI has been developing L1-SAIF signalENRI has been developing L1-SAIF signal::– Signal design: GPS/SBAS-like L1 C/A code (PRN 183);Signal design: GPS/SBAS-like L1 C/A code (PRN 183);

– Planned as an augmentation to mobile users.Planned as an augmentation to mobile users.

• Ranging Function of L1-SAIFRanging Function of L1-SAIF::– Available as an additional ranging source with self-contained Ephemeris Information;Available as an additional ranging source with self-contained Ephemeris Information;

– L1-SAIF Master Station (L1SMS) has been upgraded to broadcast Ephemeris InformL1-SAIF Master Station (L1SMS) has been upgraded to broadcast Ephemeris Information and Corrections for L1-SAIF signal itself;ation and Corrections for L1-SAIF signal itself;

– Tested successfully; Confirmed that residual error was comparable to GPS;Tested successfully; Confirmed that residual error was comparable to GPS;

– Ranging function reduces the maximum position error for both horizontal and verticaRanging function reduces the maximum position error for both horizontal and vertical.l.

• Ongoing workOngoing work::– Experiments on mobile conditions;Experiments on mobile conditions;

– Broadcasting corrections for MSAS and GLONASS satellites.Broadcasting corrections for MSAS and GLONASS satellites.

• L1-SAIF observation is available at L1-SAIF observation is available at http://www.enri.go.jp/sat/qzss_e.htmhttp://www.enri.go.jp/sat/qzss_e.htmRINEXRINEX http://www.enri.go.jp/cnspub/sat/data/rinex/http://www.enri.go.jp/cnspub/sat/data/rinex/EMSEMS http://www.enri.go.jp/cnspub/sat/data/ems/http://www.enri.go.jp/cnspub/sat/data/ems/

T. Sakai, H. Yamada, and K. Ito Electronic Navigation Research Institute, Japan T. Sakai, H. Yamada, and K. Ito Electronic Navigation Research Institute,

Documents

l1saif signals

l1saif signal offers

specification of l1

area augmentation signal

single signal

l1 single frequency

qzss conceptbroadcast

signal design