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New satellite-based systems such as GNSS give today’s aircraft an unprecedented ability for high-precision navigation and landing.

The instrument landing system (ILS), still the Cat. III precision landing system par excellence, has nonetheless encountered integrity problems due to FM interference and multipath reflection, degrading landing capabilities under low-visibility conditions.

The microwave landing system (MLS), another precision landing system, offers a viable Cat. III B landing alternative to ILS in certain geographical areas.

The GNSS landing system (GLS) is a new precision landing system, that is part of the CNS/ATM strategy to give Prevision Approach capability to increasing number of runway ends worldwide.

Airlines will soon have number of precision-landing possibilities at airports around the world, depending on whether these airports are equipped with ILS, MLS or GLS.

As of today, Thales MMR is the only MMR with an MLS certified function.

Thales has designed a 100%-digital system, the TLS755 Multi-Mode Receiver, that integrates all onboard reception functions needed for precision navigation and landing. Right from the beginning, Thales designed in full scalebility for the TLS755, through a highly modular design that allows this unit to keep pace with all applications, including the Satellite Based Augmentation System (SBAS), Ground Based Augmentation System (GBAS) and MLS. Because of Thales breadth of expertise, all functions on the TLS755 – ILS, GNSS, MLS, GLS – were developed in-house, for guaranteed compatibility.


- Meets ARINC 755 standards
- Digital MMR: Digital Signal Processing (DSP)
- 200 ms power interrupt transparency
- Highly modular design for strong scalebility
- Dual channel of processing (different hardware & software) for increased integrity
- DO160D HIRF and lightning requirements
- Full equipment monitoring

- Standard replacement for ARINC 710 ILS, incorporating ICAO Annex 10 FM immunity
- Cat. I to Cat. III B high integrity/reliability design
- Dual or triplex autoland architecture

- Permanent “en route” GNSS mode
- Primary means of navigation
- 15 tracking channels (upgrade capacity to 24 channels)
- ASIC already designed to support SBAS/GBAS and GLONASS
- SBAS: WAAS, EGNOS, MSAS capability
- FANS compliant

- Cat. I to Cat. III B high integrity/reliability design
- ILS “look alike” interface, with autopilot and display systems
- Dual or triplex autoland architecture

- GBAS: LAAS (differential GNSS) Cat. I to Cat. III B high integrity/reliability design
- GLS Cat. I (software upgrade only)
- GLS data link receiver
- ILS “look alike” interface with autopilot and display system
- Dual or triplex autoland architecture