AssistNow A-GNSS service

AssistNow Online and AssistNow Oine are u-blox’s end-

to-end A-GNSS services for OEM customers and their end

users. These services boost GNSS acquisition performance

for devices with or without network connectivity. AssistNow

Online and AssistNow Oine can either be used alone or in

combination.

AssistNow A-GNSS services require no additional hardware

and generate virtually no CPU load. The system is very easy to

implement and can be installed and operational within a day.

u-blox cellular modules feature an embedded AssistNow

client making integration simple.

AssistNow Online

Supports GPS, Galileo, GLONASS, and BeiDou

With AssistNow Online, an internet-connected GNSS device

downloads assistance data from u-blox’ AssistNow Online

Service at system start-up. The service works on all standard

mobile communication networks that support Internet

access, including GPRS, UMTS and Wireless LAN. No special

arrangements with mobile network operators are needed

to enable AssistNow Online, making this solution network

operator independent and globally available. u-blox only

sends ephemeris data for those satellites currently visible to

the mobile device requesting the data, thus minimizing the

amount of data transferred.

AssistNow

u-blox A-GNSS services

The challenge of stand-alone GNSS

GNSS users expect instant position information. With

standard positioning this is often not possible because at

least four satellites must be identied, and their complete

orbital position data (called Ephemeris) received. Under

adverse signal conditions, data downloads from the satellites

to the receiver can take minutes, hours or even fail altogether.

Assisted GNSS (A-GNSS) accelerates calculation of position

by delivering satellite data such as Ephemeris, Almanac,

accurate time and satellite status to the GNSS receiver via

wireless networks or the Internet. This aiding data enables

a GNSS receiver to compute a position within seconds, even

under poor signal conditions.

Product Summary

UBX-13003352 - R02

Fast Time-To-First-Fix, even under poor signal conditions

• End-to-end service for OEMs and end-users

• Global coverage and network operator independent

• Easy to install; no additional hardware required

• Seamless implementation with u-blox cellular modules that have an embedded AssistNow client

• Free of charge service

• Premium service with guaranteed QoS option

• Available for all u-blox GNSS products

• Low CPU load

AssistNow Oine

Supports GPS and GLONASS

With AssistNow Oine, users download u-blox’ Dierential

Almanac Correction Data from the Internet at their

convenience. The correction data is then transferred to the

mobile terminal via TCP/IP, serial port, memory card, etc, and

can either be stored in the GNSS receiver’s Flash EPROM

(if available) or in the memory of the application processor.

Therefore, the service requires no connectivity at system

start-up and enables a position x within seconds, even

when no network is available.

u-blox provides correction data valid from 1 to 35 days. The

size of these les increases with the length of the prediction

period, from as little as 3 kB to 125 kB. Positioning accuracy

decreases with the length of the correction data duration,

with 1–3 day data providing relatively high accuracy and 10–

35 day data progressively less accuracy. Regular updates

help to ensure a high level of position accuracy.

AssistNow

UBX-13003352 - R02

Legal Notice:

u-blox reserves all rights to this document and the information contained herein. Products,

names, logos and designs described herein may in whole or in part be subject to intellectual

property rights. Reproduction, use, modication or disclosure to third parties of this doc-

ument or any part thereof without the express permission of u-blox is strictly prohibited.

The information contained herein is provided “as is”. No warranty of any kind, either

express or implied, is made in relation to the accuracy, reliability, tness for a particular

purpose or content of this document. This document may be revised by u-blox at any

time. For most recent documents, please visit www.u-blox.com.

Further information

For contact information, see www.u-blox.com/contact-us.

For more product details and ordering information, see the product

data sheet.

AssistNow Online AssistNow Oine AssistNow Autonomous

Data

Data download frequency At every startup Once every X days Never

Data retrieval at start-up Data downloaded from server Pre-downloaded from local memory Retrived from local memory

Aiding data type Ephemeris, almanac, time, health Dierential almanac correction Automatically generated

Data validity period 2 - 4 hours 35 days Up to 6 days

Size of downloaded data 1 - 3 kB 10 kB (1 day) ... 125 kB (35 days) N.A.

Acquisition (TTFF) performance As low as 1 second As low as 5 seconds As low as 10 seconds

GNSS

Satellite systems supported

GPS, Galileo, GLONASS, BeiDou GPS, GLONASS GPS, Galileo, GLONASS, BeiDou

Service options

Free service Best-eort Best eort N.A.

Premium service Guaranteed availability based on

service level agreement

Guaranteed availability based on

service level agreement

N.A.

Free and premium service options

AssistNow data is collected by u-blox’ global array of satellite

receivers, and maintained in real-time on u-blox AssistNow

servers accessible via the Internet. For best-eort appli-

cations, u-blox provides AssistNow free-of-charge to its

customers.

For applications requiring a guaranteed minimum Quality

of Service (QoS), u-blox provides AssistNow Premium which

provides guaranteed availability based on a service level

agreement and 24/7 support.

Products supporting AssistNow

All u-blox GNSS receiver modules and chips

SARA-G3 and SARA-G4 series 2G cellular modules

SARA-U2 and LISA-U2 series 3G cellular modules

SARA-R4/N4 series LTE Cat M1/NB1 cellular modules

LARA-R2 and TOBY R2 series LTE Cat 1 cellular modules

LARA-R3121 LTE Cat 1 cellular module

AssistNow Autonomous

Supports GPS, Galileo, GLONASS, and BeiDou

AssistNow Autonomous is an embedded feature available

free-of-charge that accelerates GNSS positioning by

capitalizing on the periodic nature of GNSS satellite orbits.

GNSS orbit predictions are directly calculated by the

GNSS receiver and no external aiding data or connectivity

is required. AssistNow Autonomous can be used alone, or

together with AssistNow Online or AssistNow Oine for

increased positioning speed and accuracy.