GP1020 Datasheet, PDF (2/44 Pages) Zarlink Semiconductor Inc – SIX-CHANNEL PARALLEL CORRELATOR CIRCUIT FOR GPS OR GLONASS RECEIVERS

GP1020
TYPICAL GPS RECEIVER (Fig. 2)
All satellites use the same L1 frequency of 1575·42MHz, but different Gold codes, so a single front-end may be used. To
achieve better sky coverage it may be desirable to use more than one antenna, in which case separate front-ends will be needed.
GND
15V
MASTERRESET
NAVIGATION
SOLUTION
GP1010
&
FILTER
MULTIPLE ANTENNAS TO GIVE
WIDER SKY COVERAGE
MASTER CLK
SAMPLE CLK
SIGN
MAG
V_{SS MASTER/SLAVE} V_{DD CS}
SIGN 0
MAG 0
SIGN 1
MAG 1
GP1020
(MASTER)
TIC OUT INT OUT
DECODE
DATA BUS (16)
ADDR BUS (8)
CONTROL ³
OPTIONAL
SECOND
GP1010
&
FILTER
TIC IN INT IN
CS
SIGN 0
MAG 0
OPTIONAL SECOND
SIGN 1
GP1020
MAG 1
(SLAVE)
V_DD MASTER/SLAVE V_SS
DECODE
15V
GND
MASTERRESET
Fig. 2 GPS receiver simplified block diagram
TYPICAL GLONASS RECEIVER (Fig. 3)
Each satellite will use a different ‘L1’ carrier frequency, in the range 1602·5625 to 1615·500MHz, with 0·5625MHz spacing,
but all with the same 511-bit spreading code. The normal method for receiving these signals is to use several front-ends, perhaps
with the first LNA and mixer common, but certainly with different final local oscillators and mixers.
L-BAND
DOWN
CONVERTER
GLONASS FRONT-END
FILTERS, AMPLIFIERS
AND MIXERS
FREQUENCY
GENERATOR
CHANNEL
SELECTION
AND ADC
CHANNEL
SELECTION
AND ADC
CHANNEL
SELECTION
AND ADC
CHANNEL
SELECTION
AND ADC
CHANNEL
SELECTION
AND ADC
CHANNEL
SELECTION
AND ADC
GND
15V
V_{SS MASTER/SLAVE} V_DD
SAMPLE CLK _{SAMP CLK}
SIGN
SIGN 0
MAG
MAG 0
SIGN
SIGN 1
MAG
MAG 1
CS
SIGN
MAG
SIGN
MAG
SIGN
MAG
SIGN 2
MAG 2 _GP1020
SIGN 3
MAG 3
INT OUT
SIGN 4
MAG 4
SIGN
MAG
SIGN 5
MAG 5
MASTER
CLOCK
NAVIGATION
SOLUTION
MASTERRESET
DECODE
DATA BUS (16)
ADDR BUS (8)
CONTROL ³
OSCILLATOR
FREQUENCY
SELECTION
Fig. 3 GLONASS receiver simplified block diagram
2