SiRFDRive®

For Automotive, Handsets, Infotainment and Telematics

Description

The SiRFDRive line of products enables customers to create automotive GPS devices that maintain accurate positioning information in the most challenging environments. SiRFDRive1 uses low-cost external gyros and GPS sensors to create a turn-key Dead Reckoning solution that minimises complexity and time to market.

SiRFDRive2 enables high volume customers to build a cost-optimised solution by tapping directly into the vehicle’s CAN bus to retrieve speed and heading data.

Key features

Navigation available within three seconds of start-up without reliance on map matching
GPS measurements continually calibrate Dead Reckoning data to ensure optimum speed and heading accuracy
Dead Reckoning measurements validate and correct GPS fixes during signal blockage and multipath conditions
Enables devices to achieve improved urban canyon accuracy
Navigation availability in tunnels and parking garages
Seemless integration with the GSC3e/LPa GPS chipset

Benefits

SiRFDRive navigation engine allows OEM and tier 1 automotive manufacturers to build robust location-enabled devices for automotive markets such as in-vehicle navigation, asset tracking, and telematics
Unlike most Dead Reckoning systems, SiRFDRive leverages our expertise to create a highly coupled system that incorporates information from both the GPS and the Dead Reckoning sensors to provide unparalleled accuracy
When SiRFDRive is used in combination with the GSC3e/LPa chipset, users can maintain accurate positioning information in urban canyons, tunnels, and parking lots. SiRFDRive also supports SiRFInstantFix technology, which delivers fast time to first fix performance
SiRFDRive1 provides customers a turn-key solution with well-defined interfaces for gyro and odometer input. This enables customers to minimise the complexity of their system and achieve faster time to market
SiRFDRive2 does not require a dedicated gyro and can access sensor information directly from the vehicle bus
SiRFDRive2 allows high-volume customers the ability to achieve substantial cost savings while maintaining accurate Dead Reckoning accuracy and performance

Product details

Supported Chips

GSC3e/LPa

Software Options

SiRFDRive1 and SiRFDRive2
SiRFInstantFix™ extended ephemeris technology

GSC3e/LPa Chipset Package

Type: 121-ball grid array (BGA) with a pitch of 0.80 mm / Pb free

Dimensions: 10 mm x 10 mm / Height: 1.4 mm

SiRFDRive1 Dead Reckoning Sensor Requirements

Gyro for directional measurement
Wheel speed signal
High-resolution 13-bit A/D converter

Data Update Rate

1 Hz

Position Fix Availability¹

GPS and DR 99%

Horizontal Position Error, GPS and DR ¹

Static open sky <10 m
Dynamic open sky <15 m
Dynamic foliage <20 m
Dynamic urban canyon <20 m

Speed Error in 98% of Positions¹

Static open sky <0.5 mph
Dynamic open sky <0.5 mph @ >25 mph
Dynamic foliage <1.0 mph @ >25 mph
Dynamic urban canyon <1.0 mph @ >25 mph

Heading Error in Open Sky

@ speed >10 m/s, 22 mph <3 deg
@ speed >30 m/s, 66 mph <1 deg

1. Specifications based on navigation after 2 minutes GPS navigation with speed >3 m/s and HDOP <2.5.

Subject to approval, a datasheet can be made available for this product via CSR Support.