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Quasi Zenith Satellite System Navigation ServiceInterface Specifications for QZSS

IS-QZSSTopics

Note:
The maintenance of IS-QZSS (JAXA version) from now.
With starting the operation of "MICHIBIKI" by Quasi-Zenith Satellite System Services Inc. (QSS), IS-QZSS (JAXA version) will be abolished. In other hand, JAXA has a plan to continue the Research and Development of "MADOCA" and "IMES" (described in IS-QZSS (JAXA version)). Therefore, JAXA has published the first version of "MADOCA-SEAD interface specification" and "IMES interface specification"(Japanese only) as independent document separating from IS-QZSS ver.1.8. Since the use of IMES is limited in Japan, the "IS-IMES" has only Japanese. Please refer to the previous IS-QZSS ver. 1.7 Annex (English), if you need English text, because there is no change on "IS-IMES" from the Appendix of IS-QZSS ver. 1.7 (English).

2016-08-31
Release of IS-QZSS (Ver. 1.8) Draft

JAXA releases "IS-QZSS Version 1.8 Draft" (JAXA version) as the revision notice of IS-QZSS (Ver.1.7) on July, 2016 on this QZ-Vision/JAXA web site.

Main Items to be updated
Main Items to be updated from IS-QZSS Version 1.7 (published on July 2016) are as follows:
  1. Separating the descriptions of Message Type 12 of LEX Signal (MADOCA-LEX) from IS-QZSS ver.1.8. (They are published in "MADOCA-SEAD Interface Specification".)
  2. Separating Annex (the description of IMES) from IS-QZSS ver.1.8 (They are publihsed in "IMES interface specification" (Japanese Only).)

In addition, for more information of above documents, please refer to the following.
  • "MADOCA-SEAD Interface Specification" (First Edition) Draft
    Documents for data interface specification to use MADOCA products.
  • "IMES interface Specification" (IS-IMES) (First Edition) Draft (Japanese only)
    Document to provide the specification of IMES signals and the setting way of IMES transmitters. (Note: Sorry, but Japanese only.)
    • Since the use of IMES is limited in Japan, the "IS-IMES" has only Japanese. Please refer to the previous IS-QZSS ver. 1.7 Annex (English), if you need English text, because there is no change on "IS-IMES" from the Appendix of IS-QZSS ver. 1.7 (English).

Request for your comments
JAXA encourages your comments, questions or suggestions for improvement on IS-QZSS (JAXA) (Ver. 1.8 Draft) until 23 September, 2016. We would reflect the important issue of your comments and suggestions on the establish version of IS-QZSS (Ver. 1.8), and we would answer your questions, suggestions and comments when we would establish IS-QZSS ver.1.8 on this QZ-Vision/JAXA web site.

2016-07-14
Establishment and Release of IS-QZSS Ver.1.7

JAXA is pleased to announce the publication of "IS-QZSS Version 1.7 (English)" on this QZSS/JAXA web site.

Following the publication of the IS-QZSS Version 1.7 (Draft) in March 2016, we gathered comments on the document from user communities, and then held a user meeting on 15 June, 2016. As a result of those activities, we have made corrections and improvements as reflected in IS-QZSS Ver. 1.7.

Main additional points for IS-QZSS 1.7 (Draft) to fix is follows.
No.AbstractSection
1 Plan to change of the Message Type Number for the Carrier Phase Bias Correction Messages in MADOCA-LEX message. 5.7.2.2.5.1, 5.7.2.2.5.6, 5.7.2.2.5.7

JAXA always welcomes comments and questions from users for this IS-QZSS document and the QZSS. If you have, please feel free to contact us.

2016-04-08
Release of IS-QZSS (Ver. 1.7) Draft

JAXA releases "IS-QZSS Version 1.7 Draft" as the revision notice of IS-QZSS (Ver.1.6) on Nov., 2014 on this QZ-Vision/JAXA web site.

Main Items to be updated
Main Items to be updated from IS-QZSS Version 1.6 (published on Nov. 2014) are as follows:
  1. Updating information for QZS-1 based on the actual operation after the launch.
  2. Adding notes on QZSS signals to be modified according to the updating specification of GPS signals in the future IS-QZSS update.
  3. Updating information for LEX signal (modifying the description of MADOCA-LEX).
  4. Deleting the description for provision of "Ultra-Rapid". (*2016/04/20 Updated)

Request for your comments
JAXA encourages your comments, questions or suggestions for improvement on IS-QZSS (Ver. 1.7 Draft) until 8 July, 2016 (*2016/05/16 Updated). We would reflect the important issue of your comments and suggestions on the establish version of IS-QZSS (Ver. 1.7), and we would answer your questions, suggestions and comments when we would establish IS-QZSS ver.1.7 on this QZ-Vision/JAXA web site.

2014-11-28
Establishment and Release of IS-QZSS Ver.1.6

JAXA is pleased to announce the publication of "IS-QZSS Version 1.6" on this QZSS/JAXA web site.

Following the publication of the IS-QZSS Version 1.6 (Draft) in September 2014, we gathered comments on the document from user communities. As a result of that activities, we have made corrections and improvements as reflected in IS-QZSS Ver. 1.6.

From today's publication of IS-QZSS Version 1.6, JAXA will continue to improve the description of the system performance, the system operation, the data handling, and the generation and updating of the QZSS Navigation Messages to enhance the system's value to the user community.

JAXA always welcomes comments and questions from users as part of our commitment to continually improve both this IS-QZSS document and the QZSS. We also welcome communication with receiver manufacturers concerning the design and manufacturing of receivers.

About IS-QZSS

Purposes of Public Release

IS-QZSS is a document to provide users with information such as interface and service performance specifications required to develop QZSS receivers and applications.

Hoping that QZSS will be utilized by many users, JAXA aims to promote development of QZSS receivers and applications based on the released information.

Content of IS-QZSS

IS-QZSS includes a system overview, a description of services, system performance specifications, RF features of positioning signals transmitted from a QZSS satellite, message specifications and recommended user algorithms.

For GPS complementary signals (L1C/A, L1C, L2C and L5), differences between QZSS and GPS are specified to make clear modifications required for GPS receivers to use QZSS signals.

Update Process and Schedule

JAXA released the IS-QZSS incrementally. After releasing each draft version, JAXA accepted comments, questions and suggestions for improvement via e-mail from the user community. Shortly thereafter, JAXA held a publicly open QZSS User Meeting to exchange views with the user community. Using this feedback, JAXA established the IS-QZSS Ver. 1.1 after official approval and signing.

JAXA will continue to improve the description of the system performance, the system operation, the data handling, and the generation and updating of the QZSS Navigation Messages to enhance the system's value to the user community as well as updating Section 7 and the Appendix of the IS-QZSS.

Same process applied during establishing the document, as shown in Figure 1, is to be applied for updating and revising the IS-QZSS after publication of a revision notice.

Below are the flow chart (Figure 1) and planned schedule for update (Figure 2).

IS-QZSS Release and Update Process

GPS-QZSS Technical Working Group(TWG) StatementGPS-QZSS TWG Statement

The GPS - QZSS Technical Working Group (TWG) was established according to a decision made by the 2nd US-Japan GPS Plenary meeting held on October 16, 2002 in Tokyo under the auspices of the 1998 US-Japan Joint Statement on Cooperation in the use of GPS. The purpose of the TWG is to exchange information and share concepts in an effort to achieve compatibility and technical interoperability between QZSS and current and future configurations of GPS.

Both co-chair agreed to announce a formal statement which describes the process for ongoing maintenance of the IS documents for both GPS and QZSS in order to maintain interoperability between both systems. (United States - Japan Technical Working Group (TWG) Statement)

Note

* JAXA will not accept comments without your full name and contact information. Your personal information will be managed properly and used only for JAXA inquiry purposes.

* Your comments and suggestions may be anonymously published on the JAXA web site or presented for discussion at a QZSS User Meeting. Note that such public disclosures of your comments will never include your name or other personal data.

* JAXA will comprehensively examine the relevance and feasibility of your comments and suggestions and decide whether to reflect them in the subsequent revision of IS-QZSS.

* JAXA will not be able to respond to your comments and suggestions individually.

* Please refer to JAXA's official "Privacy Policy" regarding handling of collected personal information.

IS-QZSSDownload

Ver.1.8 Draft (English) (PDF file 7.8 MB)
IS-QZSS (English) (IS-QZSS ver.1.8 Draft)

Ver.1.7 (English) (PDF file 7.6 MB)
IS-QZSS (English) (IS-QZSS Ver.1.7)

Adobe Reader software is required to view and print PDF files.

Request for Your CommentsRequest for Your Comments, Questions and Suggestions for Improvement of IS-QZSS

Procedure

Comment Period

From Release Day to 23 Sept., 2016

Submission

Please download the "Comments and Suggestions for Improvement of IS-QZSS (Ver. 1.8 Draft)" and send it to us after filling in the form.

mail

Format

Comments and Suggestions for Improvement of IS-QZSS (JAXA version)

MS-WORD file

PDF file

IS-MADOCA-SEADMADOCA-SEAD Interface Specification

First Edition Draft
We released "MADOCA-SEAD Interface Specification" (First Edition) Draft. Please refer to it.

MADOCA-LEXThe broadcasting of MADOCA-LEX Realtime Products

JAXA began the internet broadcasting of "MADOCA (Multi-GNSS Advanced Demonstration tool for Orbit and Clock Analysis)" Real-time Products.
Please look at the "MADOCA Real-time Products" for details.

MADOCA-LEX Format
We described the MADOCA-LEX format in IS-QZSS Ver.1.6. Please refer to that.

Answers for Your Comments Answers for Your Comments and Suggestions for Improvement

Answers for Your Comments and Suggestions for Improvement for IS-QZSS 1.6 and 1.7 Draft

We got 4 comments, questions and suggestions for Improvement for IS-QZSS 1.6 and 1.7 Draft

Comment and Suggestions for Improvement List and Answers from JAXA.

Answers for Your Comments and Suggestions for Improvement for IS-QZSS 1.6 and 1.7Draft Download
(About 200[KB]) (Sorry, but Japanese only.)

RINEX formatRINEX 2.12 QZSS extension

RINEX 2.12 QZSS extension download

Sample data of QZSS observation data at Monitor Stations and navigation data (for RINEX2.12 QZSS ext.)

RINEX 3.01 QZSS extension

Please refer to the extension point from RINEX3.01.
RINEX 3.01 QZSS extension download

Sample data (for RINEX3.01 QZSS ext.)

Contact Us Welcome any comments

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