SAM-M8Q - Data sheet

UBX-16012619 - R06

Functional description

Page 9 of 26

Production Information

supported

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

GNSS receiver, AssistNow Autonomous automatically generates accurate predictions of satellite

orbital data (“AssistNow Autonomous data”) that is usable for future GNSS position fixes. The

concept capitalizes on the periodic nature of GNSS satellites; by capturing strategic ephemeris data

at specific times of the day, the receiver can predict accurate satellite ephemeris for up to three days

after initial reception.

The u-blox AssistNow Autonomous benefits are:



Faster fix in situations where GPS satellite signals are weak



No connectivity required



Compatible with AssistNow Online (can work stand-alone, or in tandem with AssistNow Online

service)



No integration effort; calculations are done in the background, transparent to the user.

orbit predictions for 3 days.

Specification [2].

1.7 Augmentation systems

1.7.1 Satellite-Based Augmentation System (SBAS)

The u-blox SAM-M8Q GNSS patch antenna module supports reception of SBAS broadcast signals.

These systems supplement GNSS data with additional regional or wide area GPS augmentation data.

The system broadcasts range correction and integrity information via satellite which can be used by

GNSS receivers to improve the resulting precision. SBAS satellites can be used as additional satellites

for ranging (navigation), further enhancing availability. The following SBAS types are supported:

GAGAN, WAAS, EGNOS and MSAS.

[2].

1.7.2 QZSS

The Quasi-Zenith Satellite System (QZSS) is a regional navigation satellite system that transmits

additional GPS L1 C/A signals for the Pacific region covering Japan and Australia. SAM-M8Q GNSS

patch antenna modules are able to receive and track these signals concurrently with GPS signals,

resulting in better availability especially under challenging signal conditions, e.g. in urban canyons.

The L1- SAIF signal provided by QZSS can be enabled for reception via a GNSS configuration

message.

1.7.3 IMES

The Japanese Indoor MEssaging System (IMES) system is used for indoor position reporting using

low-power transmitters which broadcast a GPS–like signal. SAM-M8Q GNSS patch antenna module

can be configured to receive and demodulate the signal to provide an in-door location estimate.