LEA-4A u-blox, LEA-4A Datasheet - Page 7

• Manufacturer Part Number: LEA-4A
• Description: Antaris 4 Gps Modules? Data Sheet
• Manufacturer: u-blox

1.8 Dead Reckoning (LEA-4R)
Dead reckoning GPS 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-4R 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-4R is a low power dead reckoning GPS receiver module. It is the ideal solution for high-volume
applications requiring a cost-effective and tightly integrated product that provides a continuous and reliable
positioning fix 100% of the time.
1.8.1 Supported Peripheral Components (LEA-4R)
The LEA-4R supports the following peripheral components (Table 9):
Table 9: Supported peripheral components
Gyroscopes should at least meet the requirements listed below:
Table 10: Required Specifications for Gyroscopes
Gyroscopes with a sensitivity (scale factor) of lower than 20mV/°/s may work but the performance will be
degraded. For this reason u-blox does not recommend using gyros 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-4R please refer to the TIM/LEA-4R
System Integration Manual [3].
1.9 Protocols
The LEA-4x series supports different serial protocols.
Table 11: Available Protocols
For specification of the various protocols see the ANTARIS
LEA-4A, LEA-4H, LEA-4M, LEA-4P, LEA-4R, LEA-4S, LEA-4T - Data Sheet
GPS.G4-MS4-06143-1
A/D converters with SPI interface
Linear Technology, LTC1860, 12-bit A/D converter
Parameter
Supply Voltage
Zero Point
Scale factor
Dynamic Range
Linearity
Recommended operating temperature range
Protocol
NMEA
UBX
RTCM
Type
Input/output, ASCII, 0183, 2.3 (compatible to 3.0)
Input/output, binary, u-blox proprietary
Input, messages 1,2,3,9
digital temperature sensors with SPI interface
National Semiconductors,
LM70, precision: 10 bits plus sign
®
4 Protocol Specification [2].
Specification
5.0V ± 0.25V
2.5V ± 0.4V
25mV/°/s ± 5mV/°/s
± 60°/s to ± 125°/s
± 0.5% (Full scale)
-40 to +85°C
your position is our focus
Runs on
All serial ports and USB
All serial ports and USB
All serial ports and USB
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