# Presentation: 609053

## Post-Processing versus Real-Time GNSS Challenging Perspectives for CORS 

- Georg Weber, BKG, Frankfurt
- CORS User Forum, 13 September 2006, Long Beach, CA

## Status

- At the same time, the community of real-time users grows dramatically.
- With the exception of high precision reference system maintenance, very soon there will remain only a few positioning applications carried out in a post-processing mode.

**Status**

## Slide 3

## The Challenge

- So far mainly post-processing oriented, public providers are requested to extend services towards real-time.
- How shall NGS/CORS cope with the new situation? Should it add new products to its portfolio and what could they be?
- What may be the appropriate technology to follow?
- What could be an appropriate policy to align to?

**The Challenge**

## Networked Transport of

**R****TCM via ****I****nternet ****P****rotocol (****Ntrip****)**
-               **-**  GPRS/UMTS Mobile Internet
-               **-**  Based on HTTP

- Caster

- Rover

- Reference

## Slide 6

## September 2004 Ntrip becomes RTCM Standard

**September 2004 ****Ntrip ****becomes**** RTCM Standard**

- Selection of devices supporting Ntrip

## European Status of NtripReal-Time GNSS Reference Networks

**Who participates in**

## Ntrip StreamsEurope

- Ntrip StreamsEurope

## Ntrip BroadcastersEurope

- Ntrip BroadcastersEurope

## US Ntrip Broadcasting Examples

**US Ntrip Broadcasting Examples**

## Real-Time GNSS Reference Networks

-   Why?
-   And what for?

## Hourly / Daily RINEX Upload

-   Why deliver a daily newspaper monthly?

## Post-Processing

- Versus
- Real-Time

- Example forcontinuously aligning
- Reference System ofNetworked RTK Service
- to ITRF / ETRS89

## Real-Time Broadcast - Product Areas

- Satellite Orbits, Clocks
- Ephemerides
- Troposphere
- Ionosphere
- Space-Weather
- Satellite Health
- Interference
- Natural Hazards
- DGPS/RTK

## Ntrip GNSS Broadcast Service Concept

- System
- Operator

- System
- Operator

- NtripClient

- NtripClient

- Mobile IP

- Mobile PI

- NtripTracker

- NtripTracker

- NtripServer

- NtripServer

- DSL

- DSL

- DSL

- DSL

- Mobile IP

- Mobile PI

- Reference
- Receiver

- Reference
- Receiver

- Rover
- Receiver

- Rover
- Receiver

- NtripClient

- Mobile IP

- NtripServer

- NtripServer

- DSL

- System
- Operator

- Primary
- NtripCaster

- Backup
- NtripMonitor

- Backup
- NtripCaster

- Primary
- NtripMonitor

- NtripTracker

- Mobile IP

- DSL

- DSL

- WAAS
- Receiver

- Reference
- Receiver

- Rover
- Receiver

- Administration

- Raw Data

- Derived Products

- Internet

- Primary
- Conversion I

- Primary
-  Conversion II

## Common adaptation or even development of GNSS software package (real-time GPS engine) within the framework of EUREF.
Long-term usage and maintenance to follow model adopted for handling of Bernese post-processing software (access to source code).

- Long-term usage and maintenance to follow model adopted for handling of Bernese post-processing software (access to source code).

**Under discussion within****European National Mapping Agencies:**

## Real-Time GNSS

**Policy Recommendations**
** **
-   Upgrade all CORS stations to real-time
-   Pick up any stream continuously made available
-   Support formats accepted by client software
-   Disseminate high-rate data
-   Setup network of Ntrip Broadcasters
-   Monitor stream flow and content
-   Assist existing real-time services
-   Participate in global stream exchange
-   Start with pilot project – Call for participation