USE

USE.MICHIBIKI

Home > USE > Message Pattern Table
  • QZSS+GPS SkyPlot QZ-radar
  • IS-QZSS
  • Message Pattern Table
  • NAQU Messages
  • Almanac
  • Ephemeris
  • Ultra Rapid Products
  • Final Products
  • LEX
  • Contact for information in generating precise ephemeris
  • Custom Downloads
  • Archive
  • API(Application Program Interface)
  • experiment schedule
  • experiment results
  • QZSS Signal Quality Report

QZSSMessage Pattern Table

QZSS Message Pattern TableOutline

What is a message pattern table?

A message pattern table is a table that shows the patterns of the Nav message in each of the L1C/A,L1C,L2C,L5 signals.

Although QZSS uses Nav message format compatible with GPS, it cannot physically broadcast all messages for QZSS itself and GPS with the same sequence.

Therefore, QZSS changes the data sequence in the original GPS Nav message.

The tables of this sequence are available for each signal frequencies.

Usually, a receiver should be designed to read the data in a message using message IDs, message types and pages, and therefore should not need to know the sequence itself.

In this WEB site, we will announce the message pattern table for QZSS users that might feel convenience in knowing it.

WARNING!:The message pattern tables listed in this WEB site may change in the future without prior notice. Please note that on designing any device, you are responsible for your use of the pattern tables and that we cannot guarantee any incompleteness due to the changes of the tables.

Structure of the Message Pattern Table

There are two types of Nav message patterns that QZSS will broadcast, namely, for "Normal" and "Emergency".

The "Normal" type is, as is, used in normal conditions.

The emergency pattern table is a special pattern table to be used for broadcasting an emergency message from QZSS to the users.

The emergency pattern includes the emergency message more frequently,so that the users can receive the message in a shorter time delay.

In the emergency pattern table, the asterisks denotes where the emergency message are set.

Since the emergency message will not always be written in a fixed format, it is described as "***" in the table.

In addition, SVID="0" in Message Pattern Table of L1C, L2C and L5 indicates that the data would be dummy data. (* Revised : 2011/09/07)

Message Pattern Table L1C/AL1C/A

Subframes 4 and 5 are managed by the message pattern table.

(Subframes 1-3 have the same format with GPS).

As for QZSS, the contents of the messages in subframes 4 and 5 are distinguished by Data ID and SV ID in the messages. (Consult chapter 5.2.2.2.5.1 in IS-QZSS). And therefore, message pattern table indicates the written order of the Data IDs and SV IDs.

As L1C/A broadcasts subframe 1-5 in 30 seconds, the message pattern table prescribes for subframes 4 and 5 of each 30 seconds block.

L1C/A Normal(*Updated: 2016/03/10)

L1C/A Emergency(*Updated: 2016/03/10)

Message Pattern Table L1CL1C

The content of subframe 3 is prescribed by the message pattern table. (Subframes 1-2 have the same format with GPS).

The message pattern table indicates the page order of subframe 3 to be broadcasted. Almanac and Differential Correction Data are determined by its SV number, and so the SV numbers are written as a parameter for each of the pages in the table.

As an L1C signal message consists of 18 seconds, the message pattern table also prescribes the order of the data in 18 seconds.

L1C Normal(*Updated: 2011/09/07)

L1C Emergency(*Updated: 2011/09/07)

Message Pattern Table L2C/L5L2C/L5

The whole Nav message is prescribed by the message pattern table.

The pattern table indicates the order of the message type to be broadcasted. Almanac and Differential Correction Data are determined by its SV number, and so the SV numbers are written as a parameter for each of the message type in the table.

As an L2C signal message consists of 12 seconds, the message pattern table also prescribes the order of the data in 12 seconds.

As an L5 signal message consists of 6 seconds, the message pattern table also prescribes the order of the data in 6 seconds.

L2C Normal(*Updated: 2011/09/13)

L2C Emergency(*Updated: 2011/09/13)

L5 Normal(*Updated: 2011/09/07)

L5 Emergency(*Updated: 2011/09/07)

Go To Top