Data Sheet

ZOE-M8 - Data Sheet
UBX-16008094 - R07 Production Information Functional description
Page 8 of 29
The ZOE-M8 SiPs can receive and process the GLONASS satellite system as an alternative to the US-based Global
Positioning System (GPS). The u-blox ZOE-M8 positioning SiPs are designed to receive and track the L1OF signals
that GLONASS provides at 1602 MHz + k*562.5 kHz, where k is the satellite’s frequency channel number (k = -7,
..., 5, 6). The ability to receive and track GLONASS L1OF satellite signals allows the design of GLONASS receivers
where required by regulations.
To take advantage of GPS and GLONASS, dedicated hardware preparation must be made during the design-in
phase. See the ZOE-M8 Hardware Integration Manual [1] for u-blox design recommendations.
1.5.3 BeiDou
The ZOE-M8 SiPs can receive and process the B1I signals that are broadcast at 1561.098 MHz from the BeiDou
Navigation Satellite System. The ability to receive and track BeiDou signals in conjunction with another constellation
results in higher coverage, improved reliability and better accuracy. Currently, BeiDou is not fully operational
globally and provides Chinese regional coverage only. Global coverage is scheduled for 2020.
1.5.4 Galileo
The ZOE-M8 SiPs 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, which enhances 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.
Galileo has been implemented according to ICD release 1.3 (December 2016). Since the Galileo satellite
system has only recently reached Initial Services (IS) and has not yet reached Full Operational Capability (FOC),
changes to the Galileo signal specification (OS SIS ICD) remain theoretically possible. u-blox therefore
recommends the use of Flash memory in designs that utilize Galileo signals, in order to allow for a firmware
update in the unlikely event of a change to the Galileo signal specification (OS SIS ICD).
Galileo reception is by default disabled, but can be enabled by sending a configuration message (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 GNSS receiver assistance information, such as ephemeris, almanac, rough user position and time, will
reduce the time to first fix significantly and improve acquisition sensitivity. All u-blox M8030 based products
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 host downloads assistance data from the u-blox AssistNow Online
service to the receiver at system start-up. The Multi-GNSS Assistance (MGA) service is an HTTP protocol based
network operator independent service.
Supplying assistance information, such as ephemeris, almanac, a rough last position and time, can reduce the time
to first fix significantly and improve acquisition sensitivity.
The AssistNow Online service provides data for GPS, GLONASS, BeiDou, Galileo and QZSS
1.6.2 AssistNow™ Offline
With the AssistNow Offline service, users can download long-term orbit data over the Internet at their convenience.
The orbit data can be stored in the memory of the application processor or alternatively external SQI flash memory
(if available). The function requires no connectivity at system start-up, enabling a position fix within seconds, even
when no network is available. AssistNow Offline offers augmentation for up to 35 days.
AssistNow Offline service provides data for GPS and GLONASS only, BeiDou and Galileo are not currently
supported