CAM-M8 - Data Sheet

UBX-15031574 - R04

Page 9 of 31

Production Information

1.5.4 Galileo

The CAM-M8 series positioning modules can receive and track the E1-B/C signals centered on the

GPS L1 frequency band. GPS and Galileo signals can be processed concurrently together with either

BeiDou or GLONASS signals, enhancing coverage, reliability and accuracy. The SAR return link

message (RLM) parameters for both short and long versions are decoded by the receiver and made

available to users via UBX proprietary messages.

live signals from the Galileo in-orbit validation campaign. Since the Galileo satellite system has

not yet reached Initial (IOC) nor Full Operational Capability (FOC), changes to the Galileo signal

specification (OS SIS ICD) remain theoretically possible. u-blox therefore recommends to use

Flash based modules in designs utilizing Galileo signals in order to allow for a FW update in the

unlikely event of a change to the Galileo signal specification (OS SIS ICD).

(UBX-CFG-GNSS) to the receiver. See the u-blox 8 / u-blox M8 Receiver Description Including

Protocol Specification [2] for more information.

1.6 Assisted GNSS (A-GNSS)

Supply of aiding information, such as ephemeris, almanac, rough last position and time, will reduce

the time to first fix significantly and improve the acquisition sensitivity. The u-blox CAM-M8 series

receivers support the u-blox AssistNow Online and AssistNow Offline A-GNSS services, support

AssistNow Autonomous, and are OMA SUPL compliant.

1.6.1 AssistNow™ Online

With AssistNow Online, an internet-connected GNSS device downloads assistance data from u-

blox’s AssistNow Online Service at system start-up. AssistNow Online is network operator

independent and globally available.

u-blox only sends ephemeris data for those satellites currently visible to the device requesting the

data, thus minimizing the amount of data transferred.

Supply of aiding information, such as ephemeris, almanac, rough last position and time, will reduce

the time to first fix significantly and improve the acquisition sensitivity.

1.6.2 AssistNow™ Offline

With AssistNow Offline, users download u-blox’s long-term orbit data from the Internet at their

convenience. The orbit data must be stored in the memory of application processor. Therefore, the

service requires no connectivity at system start-up and enables a position fix within seconds, even

when no network is available. AssistNow Offline data offers augmentation for up to 35 days.

currently supported

1.6.3 AssistNow™ Autonomous

AssistNow Autonomous provides aiding information without the need for a host or external network

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