MADOCA PPP PERFORMANCE EVALUATION
IN ASIA AND OCEANIATOKYO UNIVERSITY OF MARINE SCIENCEAND TECHNOLOGY
GPS/GNSS LABORATORYNOBUAKI KUBO

PURPOSE The first objective is to evaluate real

MADOCA PPP performance in several
countries in Asia and Oceania.
 The second objective is to find thepotential users of PPP in thesecountries.

Here, we can see QZSS
at 10 degrees
Freely available in Asia and Oceania

MADOCA-PPP（no base station）
PPP correction service（operation in the near future）
Precise orbit and clock

LEX signal (L6)
broadcasting

Upload to QZSSMADOCA
After 15 min., we can get
10 cm accuracy. With newmethod, we can shorten
the time and PPP-AR ispossible
Product(LEX signal)

Controlstation
Users

Product

MADOCA

GPS・GLONASS・QZSSPrecise orbit and clock

CONVENTIONAL  NOW
decodeConventional
Software receiver

Now

PPP

LEX

High-end receiver

PPP

Low-cost small receiver isavailable for PPP.
Dr. Dinesh demonstrates it.

All you need is to connect antenna.

ISSUES IN SEA AND UNDEVELOPED AREA
It is difficult to use cm-level accuracy on the sea andundeveloped areas without controlled base stations.

PPP is possible through the satellite
No limitation in baseline

20km~30km (RTK)
基地局

EVALUATION

13cm×9cm

 Receiver is multi-GNSS receiver

manufactured by Magellan Systems Japan.
 Locations are 1 in Japan and 7 in foreigncountries including Singapore.
 Errors in each station are evaluated basedon true position (ITRF2014)→suitablefor moving platform in global (shipand airplane)
True position is given by several
software based on ITRF2014

NMEA(PPP)OUTLINE OF LOCATIONS

Locations (Time)TUMSAT JAPAN（August）
Chula Thailand（August）
UOP Philippine（August）
MJIIT Malaysia（Nov.)
Curtin Australia（Nov.）UOI Indonesia（Dec.）
Singapore：（Feb.）
Vietnam：（Feb.）

ThailandTokyoAustralia→←Malaysia

DATA ACQUISITION IN APRIL 2020

 JP・・・no data from 18 to 23 due to PC reboot (no one came to lab.) UP・・・OK
 Thailand・・・ OK MJIIT・・・impossible to upload sue to COVID19
 Indonesia・・・waiting for 28,29,30
 Curtin・・・ OKPlace：UPTime：April
App used：GPASLIB
True position：
Latitude 14° 39' 23.13498" NLongitude 121°04' 11.11668" EEl. Height 134.266 m
Yellow line：real timeBlue line：post-processingexample

1,APR,2020,REAL TIME

Average absolute horizontal error for each countries (April)
0.35

0.3

0.25

0.2

0.15

0.10.05

0

3月30日

4月4日

4月9日

4月14日

日本

UP

Thailand

4月19日
MJIIT

Indonesia

4月24日
Curtin

4月29日

5月4日

mHorizontal STD for each countries (April)

0.5
0.45

0.4
0.35

0.3
0.25
0.2

0.15
0.1

0.05
0

3月30日

4月4日

4月9日

4月14日

日本

UP

Thailand

4月19日
MJIIT

Indonesia

4月24日
Curtin

4月29日

5月4日

LONG TERM EVALUATION
ID : kaiyodaimagellan@gmail.com

Daily RTCM3 and NMEA

• Google Drive is used to share alldata.
• With internet access, daily
solutions are uploaded
automatically.
• At least, more than 1-2 years
long term results will bechecked.

POST PROCESSING EVALUATIONAt the beginning of evaluation, we see somelarge errors of MSJ receiver output. It isvery important to distinguish thecauses from receiver PPP engine ? orMADOCA correction ?

Orange：MSJ receiver Green：Post-processing

Double checking by post-processing is very
important. We just post-processed “raw data+ Madoca correction” by using
GPASLIB/RTKLIB. These results are also
shared with other countries.

SUMMARY We will continue to monitor the real MADOCA-PPP performance.
 Let’s find out potential applications using PPP each other.
 PPP might be more suitable than RTK for some applications.