CAM-M8 - Data Sheet

UBX-15031574 - R04

Page 10 of 31

Production Information

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.

u-blox’s AssistNow Autonomous benefits are:

•

Faster fix in situations where GNSS satellite signals are weak

•

No connectivity required

•

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

Online service)

•

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

only orbit predictions for 3 days.

Specification [2].

1.7 Augmentation systems

1.7.1 Satellite-Based Augmentation System (SBAS)

The u-blox CAM-M8 series positioning modules support SBAS. These systems supplement GPS data

with additional regional or wide area GPS augmentation data. The system broadcasts augmentation

data via satellite and this information can be used by GNSS receivers to improve the resulting

precision. SBAS satellites can be used as additional satellites for ranging (navigation), further

enhancing precision and availability. The following SBAS types are supported with CAM-M8

modules: GAGAN, WAAS, EGNOS and MSAS.

Specification [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. CAM-M8Q/C

positioning 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. CAM-M8Q/C modules can be configured

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