// blog

# Galileo GNSS: Signals, Services & Accuracy Explained

Understand Galileo's E1/E5 signals, augmentation and accuracy - plus how multi-GNSS improves robustness in telematics devices.

          Updated 14 Aug, 2025

          [← All posts](https://www.autopi.io/blog/)

  Dual frequency Galileo receivers now deliver 20 cm positioning on European highways, enabling true lane-level guidance for ADAS and autonomous pilots.

  With 34 operational satellites orbiting at 23 222 km, Galileo augments GPS and BeiDou by adding the E1 and E5 bands that most modern smartphones already track.
  The new High Accuracy Service broadcasts free PPP corrections that converge in minutes, giving civil users centimeter results once reserved for survey-grade gear.

  Security is no longer an afterthought either.  OS-NMA authentication lets devices verify that navigation messages are genuine and shields critical systems from spoofing.

  This article unpacks the signal structure, service tiers, and real-world performance gains so you can decide how to integrate Galileo into next-generation vehicle, drone, or IoT platforms.

## What is Galileo GPS and How Does It Stand Against the U.S. GPS?

The European GNSS, known as Galileo GPS, is the European Union's pride. Operating as a formidable [global navigation satellite system (GNSS)](https://www.autopi.io/hardware/compare/), it is Europe's answer to the United States' GPS. But how do they match up?

Crafted by the European Space Agency, the Galileo GPS navigation system was initiated on May 26, 2003, under the
watchful eye of the European Commission. Anchored by its robust Galileo satellite constellation, and contrary to
satellite systems like the US GPS, Galileo champions civilian use. Nevertheless, its operational capability allows it to
transition for military usage during high-alert situations.

Galileo satellites form the backbone of this GNSS. The system flaunts over 24 satellites, positioned meticulously in
three orbital planes, 23,222 km away from the Earth. These satellites ensure that the Galileo signal retains its
strength, thereby [providing superior positioning accuracy](https://www.autopi.io/software-platform/cloud-management/) over its counterparts.

    [
        Discover Precise Vehicle Positioning
    ](https://www.autopi.io/hardware/autopi-canfd-pro/)

##
Galileo vs. Other Satellite Navigation Systems: A Question of Precision

Galileo's paramount strength lies in its accuracy. When gauged against other satellite navigation systems, Galileo
reigns supreme. It pledges an accuracy of 1 meter for professionals and 5 meters for the general user base. When pitted
against the American GPS, Galileo shines brighter, boasting an under-one-meter accuracy via its broadcast ephemeris. The
traditional GPS lags slightly, offering a three-meter range.

    [

    ](https://www.autopi.io/hardware/autopi-canfd-pro/)

        [
            Discover Now!
        ](https://www.autopi.io/hardware/autopi-canfd-pro/)

##
Diving Deeper: Galileo’s Multifaceted Services

1.

**
Open Service:** Open to all, it [offers one-meter positioning](https://www.autopi.io/hardware/autopi-canfd-pro/) with compatible equipment.

2.

**
High Accuracy Service:** Formerly named the Commercial Service, this promises a centimeter-level accuracy without charges.

3.

**
Public Regulated Service:** Designed for resilience, this service embeds anti-jamming measures and steadfast problem
detection mechanisms.

4.

**
Search and Rescue:** Powered by Galileo's data, it zeroes in on beacons, enabling swift rescues.

##
Galileo's Trajectory in the European GNSS Landscape

With its roots embedded deep in the lucrative EUR 175 billion GNSS market, Galileo's stake is formidable. It aligns with
the GNSS gamut, featuring stalwarts like [GPS](https://www.autopi.io/software-platform/cloud-management/), [GLONASS](https://www.autopi.io/blog/what-is-glonass-explained/), NavIC, QZSS, and [BeiDou](https://www.autopi.io/blog/beidou-gps-navigation-satellite-system/). Although it's a budding player, Galileo
promises unparalleled benefits to a vast spectrum of users, from emergency teams to civilians. Italy and Germany are
pivotal contributors, with the Galileo Control Centers headquartered in Prague, Czech Republic.

Space is indispensable to GNSS. Galileo harnesses space to curate impeccable timing, navigation, and positioning
solutions. The satellite signals, relayed to GNSS receivers, are decoded to derive precise longitude, latitude, and time
metrics. Symbolizing European excellence in satellite navigation, it reinforces Europe's commitment to innovation.

The ["Galileo vs. GPS"](https://www.autopi.io/hardware/compare/) debate is intense. However, Galileo's unwavering focus on accuracy, tailored services, and
civilian commitment grants it an edge. Representing Europe's tech strides, the Galileo GNSS is setting new benchmarks in
satellite navigation, etching Europe's indomitable mark on the global GNSS canvas.

## Constellation Status (August 2025)

Galileo operates a three–orbital–plane constellation at 23 222 km altitude and 56 deg inclination.
Thirty-four satellites are healthy: 30 in active service and 4 in orbital reserve.
Ground control includes two main control centres (Fucino, Oberpfaffenhofen) and a worldwide network of sensor stations for clock steering and orbit determination.

- Launch cadence: 2 Soyuz pairs (last in 2024) and 1 Ariane 6 quartet planned for 2026.

- Second-Generation satellites (G2G) start deployment in 2026 with electric propulsion and inter-satellite links.

- Mean time to user range error (URE) < 0.9 m (95 percentile) based on EUSPA 2025 performance report.

## Galileo Signal Suite

Galileo transmits its civil signals on four main frequency bands.
Dual-frequency receivers typically combine E1 with either E5a or E5b to remove ionospheric error, while survey-grade units add E6 for centimetre-level PPP or encrypted Commercial Authentication.
The table below lists each band’s centre frequency, modulation type, and service tier so you can match chipset capabilities to accuracy, anti-spoofing, and multipath requirements.

| Band
               | Frequency (MHz)
               | Modulation
               | Civil Service
               | Notes
             |
| --- | --- | --- | --- | --- |
| E1 (B+C)
               | 1575.42
               | CBOC (1,1)
               | Open Service
               | Shared hardware front-end with GPS L1C
             |
| E5a
               | 1176.45
               | BPSK(10)
               | Open Service
               | Pair with GPS L5 for fast iono correction
             |
| E5b
               | 1207.14
               | BPSK(10)
               | Open Service
               | Lower multipath in urban canyons
             |
| E6 (B+C)
               | 1278.75
               | CBOC (1,1)
               | High Accuracy & Commercial Authentication
               | Encrypted PRS on E6A
             |

## Service Portfolio (2025)

Galileo delivers more than a single positioning channel.
Its multi-tier service portfolio ranges from free, meter-level navigation for every smartphone to centimetre-level corrections and government-grade encrypted links.
Understanding each tier helps integrators choose the right antenna, receiver firmware, and compliance pathway.
The summary below reflects the status and availability planned for 2025.

1. **Open Service (OS)** – free dual-frequency positioning with sub-1 m accuracy worldwide.

2. **High Accuracy Service (HAS)** – PPP corrections broadcast on E6B for 20 cm accuracy, open and free since 2024.

3. **Open Service Navigation-Message Authentication (OS-NMA)** – cryptographic signature now in public beta, mitigates spoofing.

4. **Public Regulated Service (PRS)** – encrypted signal for authorised government users, resistant to jamming.

5. **Search and Rescue (SAR)** – return link confirms receipt of distress beacon within one minute.

## Accuracy Benchmarks

Evaluating real-world precision requires more than datasheet claims.
The benchmarks below summarise static, dynamic, and urban tests performed with production receivers in 2025.
Results highlight the improvement gained from dual-frequency tracking and High Accuracy Service corrections, as well as the degradation expected in dense multipath environments.
Use these numbers as reference points when specifying antennas, inertial co-navigation, or PPP services for your own platform.

| Test Scenario
               | Receiver
               | Horizontal RMS
               | Notes
             |
| --- | --- | --- | --- |
| Static base, rural EU
               | Dual-band E1+E5
               | 0.021 m
               | HAS PPP after 12 min convergence
             |
| Highway ADAS demo
               | Automotive chipset
               | 0.24 m (95 percent)
               | E1/E5 coupled with inertial sensors
             |
| Urban canyon, Paris
               | E1 only
               | 1.2 m
               | Multipath dominant, mitigated by RAIM
             |

## Galileo vs GPS vs BeiDou

How does Galileo stack up against the long-established GPS constellation and China’s rapidly expanding BeiDou system?
The comparison table below highlights key technical metrics, including satellite count, orbit design, dual-frequency support, authentication, and high-accuracy services, so engineers can decide which signals to prioritise in multi-GNSS receivers for automotive, UAV, and IoT applications.

| Feature
               | Galileo
               | GPS
               | BeiDou (BDS-3)
             |
| --- | --- | --- | --- |
| Operational satellites (Aug 2025)
               | 34 / 30 active
               | 31
               | 45
             |
| Orbit altitude / inclination
               | 23 222 km / 56 °
               | 20 180 km / 55 °
               | MEO 21 528 km / 55 ° + GEO + IGSO
             |
| Civilian dual-frequency
               | E1 + E5
               | L1 + L5
               | B1C + B2a
             |
| Baseline accuracy (single-point)
               | < 1 m (Open Service)
               | ≈ 1.5 m (Standard PVT)
               | ≈ 1 m (Open Service)
             |
| High-accuracy broadcast
               | HAS PPP (~ 20 cm)
               | No native PPP; relies on SBAS
               | PPP-B2b (~ 2 cm)
             |
| Navigation message authentication
               | OS-NMA (public beta)
               | None (planned for GNSS III)
               | B1C + B2a anti-spoof flags
             |
| Unique features
               | Return-link SAR ✓
               | Legacy SBAS network ✓
               | Two-way short message ✓
             |

    Ready to tap Galileo’s precision in your own vehicles or IoT devices?

    Deploy the [AutoPi TMU CM4](https://www.autopi.io/hardware/autopi-tmu-cm4/) with a dual-band antenna to stream E1 / E5 data into
    [AutoPi Cloud](https://www.autopi.io/software-platform/cloud-management/) for real-time dashboards.

    Need raw observations and CAN bus correlation? The [AutoPi CAN-FD Pro](https://www.autopi.io/hardware/autopi-canfd-pro/)
    logs every epoch alongside vehicle telemetry for seamless sensor fusion.

    [

    ](https://www.autopi.io/software-platform/cloud-management/)

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        Questions? Let's get in touch!
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// hardware

## Choose hardware for your integration

Compare Mini, CAN-FD Pro and TMU CM4 by vehicle data access, interfaces and custom software needs.

        [Compare devices →](https://www.autopi.io/hardware/compare/)

###### Hardware

## Choose your evaluation device

Start with the hardware your project needs. Software and connectivity terms differ by device and purchase option. Prices below exclude VAT, duties, shipping and optional accessories.

            CAN-FD Pro
            In stock · ships tomorrow

### Dual CAN-FD data logger

High-throughput raw frame capture on two independent CAN-FD channels. On-device DBC decoding, ASAM MDF4 output, J1939 native support and hardware-encrypted data signing - all on a Raspberry Pi CM4.

→ 2× CAN-FD · >3,000 fps/channel · 5 Mbps

→ 4 GB LPDDR4 · 32 GB eMMC + USB expansion

→ NXP SE051 · Tailscale SSH · Docker · S3 sync

→ 12–35 V DC · J1939 · OBD-II · 4G/LTE + GPS

            From EUR 599. AutoPi software included without a subscription. Cellular SIM and data purchased separately.

          [Order CAN-FD Pro](https://shop.autopi.io/products/autopi-can-fd-pro)
          [Learn more](https://www.autopi.io/hardware/autopi-canfd-pro/)

            Mini
            In stock · ships tomorrow

### Fleet telematics & OBD-II

OBD-II and supported EV telemetry with GPS and built-in 4G/LTE. Check your exact vehicle, required signals and regional variant; installation and configuration needs vary.

→ OBD-II / K-Line · EV parameters · GPS tracking

→ 4G/LTE Cat 1 · BLE · internal antennas

→ −40°C to +85°C · CE/UKCA/E-Mark/RoHS

→ 10–30 V DC · compact · fleet-ready out of box

            EUR 129 + EUR 6/month for SIM and Cloud, with a 12-month minimum. First-year minimum: EUR 201. Includes 100 MB/month.

          [Order Mini](https://shop.autopi.io/products/autopi-mini)
          [Learn more](https://www.autopi.io/hardware/autopi-mini/)

            TMU CM4
            In stock · ships tomorrow

### Edge compute platform

Raspberry Pi CM4-based telematics unit for custom software stacks. Run Docker containers, Python services and CAN-FD logging on the same device - managed remotely via AutoPi Cloud.

→ BCM2711 CM4 · 1 GB LPDDR4 · 8 GB eMMC

→ 2x CAN or CAN-FD variant · Docker · Python · SocketCAN

→ NXP SE051 · Tailscale · WiFi · BT 5.0 · GPS

→ 12–35 V DC · 4G/LTE Cat 4 · IP67 option

            From EUR 235 with the SIM and Cloud subscription option: EUR 6/month, 12-month minimum. Also available without a subscription; select your interface and payment option in the shop for the price.

          [Order TMU CM4](https://shop.autopi.io/products/autopi-telematics-unit-cm4-4g-lte-edition)
          [Learn more](https://www.autopi.io/hardware/autopi-tmu-cm4/)

      [Compare all devices →](https://www.autopi.io/hardware/compare/)

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