Tech Chat | What is Galileo High Accuracy Service (HAS)?
As a cornerstone in Global Navigation Satellite Systems, Galileo has been a familiar presence in our daily lives. Since commencing testing and experimentation of the innovative High Accuracy Service (HAS) in 2019, Galileo has embarked on a transformative journey. In the present year of 2024, HAS is progressively extending its global coverage and services. Join us in this blog as we delve into the essence of HAS, exploring its potential to enhance both our work and daily experiences.
What is HAS?
1.1 HAS – A Free PPP service from Galileo
HAS, or High Accuracy Service, is a groundbreaking offering from Galileo. It's designed to provide high-accuracy Precise Point Positioning (PPP) corrections at no cost. These corrections are transmitted through the Galileo E6-B data component in real-time, and via terrestrial means, enhancing user positioning performances across Galileo and GPS, both in single and multi-frequency scenarios.
1.2 Roadmap to Precision
As of 2024, HAS strides confidently into its third phase, marking the commencement of global service availability. The journey to this milestone has been paved through meticulous testing, experimentation, and a strategic roadmap that positions HAS as a game-changer in the field of navigation.
Galileo HAS roadmap (picture from HAS Info Note)
HAS Service Levels and Accuracy
HAS unfolds in two distinct service levels, each catering to specific coverage areas and precision requirements. Let's take a glance at the key characteristics:
| HAS | SERVICE LEVEL 1 | SERVICE LEVEL 2 |
| Coverage | Global | European Coverage Area (ECA) |
| Type Of Corrections | PPP - orbit, clock, biases (code and phase) | PPP - orbit, clock, biases (code and phase) incl. atmospheric corrections |
| Format Of Corrections | Open format similar to Compact-SSR (CSSR) | Open format similar to Compact-SSR (CSSR) |
| Dissemination Of Corrections | Galileo E6B using 448 bits per satellite per second / terrestrial (internet) | Galileo E6B using 448 bits per satellite per second / terrestrial (internet) |
| Supported Constellations | Galileo, GPS | Galileo, GPS |
| Supported Frequencies | E1/E5a/E5b/E6; E5 AltBOC L1/L5; L2C | E1/E5a/E5b/E6; E5 AltBOC L1/L5; L2C |
| Horizontal Accuracy 95% | <20cm | <20cm |
| Vertical Accuracy 95% | <40cm | <40cm |
| Convergence Time | <300 s | <100 s |
| Availability | 99% | 99% |
The WHY Behind HAS
The high-accuracy positioning market is very dynamic, currently driven by emerging applications such as autonomous vehicles and drones. This shift towards democratization of high accuracy opens new possibilities, making HAS a vital player in the evolving landscape.
Considering a trade-off between many factors such as requirements for accuracy, coverage, convergence time, integrity, price, user support, and also the operational complexity to implement the solution, Galileo came up with HAS – no base station or CORS makes the solution more cost-effective and convenient. With a target accuracy of less than two decimetres, HAS caters to a spectrum of emerging applications, including:
- Autonomous Driving: Ensuring precise location data for the safety of autonomous vehicles.
- Surveying and Mapping: Revolutionizing traditional surveying methods with centimeter-level accuracy.
- Precision Agriculture: Optimizing farming practices through accurate positioning data.
- Aviation
- Road
- Consumer Solutions
- Rail
- Maritime & Inland Waterways
- ......
HAS: Bridging the Gap with SingularXYZ Products
Having gained insights into the remarkable capabilities of HAS, are you eager to experience its performance firsthand? Stay tuned for our next blog, where we will guide you through the seamless integration of HAS with our geospatial and agricultural products. Together, we'll unlock a realm of possibilities that redefine precision and innovation for our users.
