User Manual

LEA-6 - Data Sheet

GPS.G6-HW-09004-E2 Page 11 of 26

1.14 Dead Reckoning (LEA-6R)

LEA-6R receivers supplement the GPS information with an incoming signal from a gyroscope (turn rate sensor)

and odometer pulses to do dead reckoning navigation through periods of poor GPS reception. Depending on

the quality of the available GPS signals, the LEA-6R uses an algorithm specially developed by u-blox in order to

compute the next positions accurately by using an automatically weighted average of the GPS and sensor inputs.

This provides precise navigation in locations with no or impaired GPS reception, for example in tunnels, indoor

car parks and deep urban canyons.

The LEA-6R is a low power dead reckoning GPS receiver module. The LEA-6R is the ideal solution for applications

requiring accurate, reliable positioning, all of the time.

The LEA-6R includes a front-end LNA.

1.14.1 Supported peripheral components (LEA-6R)

The LEA-6R supports the following peripheral components:

A/D converters with SPI interface digital temperature sensors with SPI interface

Linear Technology, LTC1860, 12-bit A/D converter National Semiconductors,

LM70, precision: 10 bits plus sign

Table 7: Supported peripheral components

Gyroscopes should at least meet the requirements listed below:

Parameter

Specification

Supply Voltage 5.0 V ± 0.25 V

Zero Point 2.5 V ± 0.4 V

Sensitivity 25 mV/°/s ± 5 mV/°/s

Dynamic Range ± 60°/s to ± 125°/s

Linearity ± 0.5% (Full scale)

Recommended operating temperature range –40°C to +85°C

Table 8: Required Specifications for Gyroscopes

Gyroscopes with a sensitivity of lower than 20 mV/°/s may work but the performance will be degraded. For this

reason u-blox does not recommend using gyroscopes with a lower sensitivity.

For implementation details as well as a list of supported gyroscopes that u-blox is currently aware of, or for more

information about Dead Reckoning and other special features of the LEA-6R refer to the LEA-6/NEO-6/MAX-6

Hardware Integration Manual [1] and the u-blox 6 Receiver Description including Protocol Specification [2].