Receiver Base Band IP1012 ADVANCE INFORMATION General Descri
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Receiver Base Band
IP1012
ADVANCE INFORMATION General Description
TChip IP1012 base-band processor (intellectual property) module C/A-code applications. implements correlation channels, timing generation, baseband control microprocessor asynchronous interface. tracking modules supported. Each module configured acquisition, tracking disabled individually. Data base-band registers compatible with most microprocessors. Signalling implemented with interrupt whose period between 100µs 990µs. Each channel delivers correlated data well integrated carrier phase, epochs, C/A-code phase, code carrier phase measurements. measurements period between 65s, controlled interrupt signal which aligned time deliver 1PPS aligned measurements. IP1012 interfaces directly TChip TJ1004 front-end. Other down-converters with digital output also used. power modes used depending conditions received signals needs application software while base-band processor idle state when used.
Features
tracking modules C/A-code sign magnitude input signal Clock frequency between 12.288MHz 18.432MHz Asynchronous processor interface User defined interrupt measurement rate Optional 1PPS measurements alignment Shut-down, reduced duty-cycle on/off modes Individual channel activation control Direct support TJ1004 front-end power modes
Applications
Location-aware cellular phones Wristwatches, time references PDAs, handheld navigation systems Covert receivers Asset tracking Power-sensitive, battery operated receivers
TJ1004 FE_P1 FE_P0
BASE BAND REGISTER FILE
TIMING GENERATOR
MEAS_INT ACC_INT TJ_CLK NRST
CORRELATION ON/OFF
ADDR DATA_OUT DATA_IN TRACKING MODULE
CARRIER
TRACKING MODULE REGISTER FILE
CODE REPLICA GENERATION
TIMING CTRL
INTEGRATOR INTEGRATOR
IF_IN
SYNC
INTEGRATOR INTEGRATOR
tracking modules
information this data sheet preliminary nature subject change without notice. TChip Semiconductor assumes responsibility use, infringement patents other rights from third parties which result from use. license implied under patent patent right TChip DS-IP1012 0.0- February2001 Semiconductor. 2001 TChip Semiconductor CH-6926 Manno, Switzerland. http://www.tchip.com
IP1012
Power Operating Modes
Power Mode
this operating mode correlation halted active channels base-band portion code duration. During correlation freeze time external signal generated which used deactivate signal path front-end chip1 size deactivation window adjusted from 100% code period. Power Mode used when ratios tracked satellites particularly good. Once deactivation window software, full operation with reduced power consumption executed transparently application.
C/A-Code TJ1004 Correlators dump Interrupt 900-950
ADVANCE INFORMATION
Power Mode
This power mode exploits fact that navigation data repeated times signal. Thus correlation halted large portion 20ms period, when this redundancy needed. deactivation window kept below 20ms, full operation still implemented software. deactivation window extended above 20ms which case navigation message acquired. Positioning still carried software basis stored navigation message. Power Mode conditioned ratio tracked satellites well impact Doppler effect received signals. During deactivation period external signal generated which used front-end chip power mode where only clock provided
Channel Deactivation
tracking modules shut down individually. This allows power saving when some tracking modules needed (eg. after acquisition satellites).
Figure Power Mode
Note Directly supported TJ1004 stand-by mode Note Directly supported TJ1004 doze mode
2001 TChip Semiconductor CH-6926 Manno, Switzerland. http://www.tchip.com DS-IP1012 0.0- February2001
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