Rainbow Electronics DAB-GPS-C01 - Manual (Page 4)

LEA-5H, LEA-5S, LEA-5A - Data Sheet Preliminary u-blox proprietary
GPS.G5-MS5-07026-P4 Page 4
your position is our focus
1.3 Block Diagram
RF Front-End
with
Integrated LNA
Baseband Processor
Power
Management
TCXO or XTAL
RTC
FLASH EPROM
(optional)
Antenna
Supervision
(optional)
Power Control
RF_IN
V_ANT
AADET_N
VCC_RF
VCC
V_BACKUP
G ND
VCC _OUT
UART
EXTINT
RESET_N
USB V2.0
CFG_COM1
Digital
IF Filter
Backup
RAM
ROM Code
GPS/GALILEO
Engine
ARM7 CPU
SRAM
TIMEPULSE
SAW
Filter
RTC
VDDIO
DDC
SPI
Figure 1: Hardware Block Schematic
1.4 Assisted GPS (A-GPS)
Supply of aiding information like ephemeris, almanac, rough last position and time and satellite status and an
optional time synchronization signal will reduce time to first fix significantly and improve the acquisition
sensitivity. All LEA-5 modules support the u-blox AssistNow Online
and AssistNow Offline A-GPS services and are
OMA SUPL compliant.
1.5 KickStart
A new feature available with u-blox 5 receiver modules is SuperSense ® KickStart. This functionality uses a TCXO
to accelerate weak signal acquisition, enabling faster start and reacquisition times. KickStart is available with the
LEA-5H and LEA-5S.
1.6 GALILEO
The u-blox 5 is a GNSS chip that receives and tracks GPS and GALILEO signals simultaneously, enhancing
accuracy and coverage. When GALILEO-L1 signals become available, u-blox 5 receivers equipped with FLASH
memory will be capable of receiving and processing them via a simple upgrade. The ability to receive and track
GALILEO satellite signals will result in higher coverage, improved reliability and better accuracy.
1.7 Protocols
Protocol Type
NMEA Input/output, ASCII, 0183, 2.3 (compatible to 3.0)
UBX Input/output, binary, u-blox proprietary
Table 2: Available Protocols
Both protocols are available on UART, USB, DDC and SPI. For specification of the various protocols see the
u-blox 5 Protocol Specification [2].