User Manual

LEA-6 - Data Sheet

GPS.G6-HW-09004-E2 Page 7 of 26

1.4 Block diagram

Figure 1 Block diagram (For available options refer to the product features table in section 1.2.)

1.5 Assisted GPS (A-GPS)

Supply of aiding information like ephemeris, almanac, approximate previous position and time, satellite status

and an optional time synchronization signal will reduce time to first fix significantly and improve the acquisition

sensitivity. All LEA-6 modules support the u-blox AssistNow Online

and AssistNow Offline

A-GPS services

and are

OMA SUPL compliant.

1.6 AssistNow Autonomous

AssistNow Autonomous provides functionality similar to Assisted-GPS without the need for a host or external

network connection. Based on previously broadcast satellite ephemeris data downloaded to and stored by the

GPS receiver, AssistNow Autonomous automatically generates accurate satellite orbital data (“AssistNow

Autonomous data”) that is usable for future GPS position fixes. AssistNow Autonomous data is reliable for up to

3 days after initial capture.

u-blox’ AssistNow Autonomous benefits are:

• Faster position fix

• No connectivity required

• Complementary with AssistNow Online and Offline services

• No integration effort, calculations are done in the background

For more details see the u-blox 6 Receiver Description including Protocol Specification [2].

1.7 Oscillators

LEA-6 GPS modules are available in Crystal and TCXO versions. The TCXO allows accelerated weak signal

acquisition, enabling faster start and reacquisition times.

1.8 GALILEO

When GALILEO-L1 signals become available, LEA-6H receivers will be capable of receiving and processing them

via a firmware upgrade. The ability to receive and track GALILEO satellite signals will result in higher coverage,

improved reliability and better accuracy.

AssistNow Offline requires external memory on the host for LEA-6S, LEA-6A, and LEA-6T-0