3

General description

3.1

Multi-constellation and multi-band

The constellations that STA8135GA supports are the following ones:

•

GPS (L1 C/A, L2C, and L5)

•

GLONASS (L1OF, L2OF)

•

BeiDou (B1C, B1I, B2a, B2I)

•

GALILEO (E1, E5a, E5b, E6)

•

QZSS (L1 C/A, L2C, L5)

•

NAVIC - former IRNSS (L5)

Carrier phase raw measurements are also provided.

STA8135GA supports a wide range of combinations of such signals and bands without the need of external RF

front end. The most important GNSS user cases that can be supported by STA8135GA are listed in the below

table. Each of those cases would require a dedicated firmware.

Table 9. GNSS user cases

Constellation

GPS/QZSS

Glonass

BeiDou

Galileo

NAVIC

SBAS

Frequency

L1 C/A

L2C

L5

L1OF

L2OF

B1I

B2I

B2A

E1

E5b

E5A

E6

L5

L1 C/A

Case 0

X

X

-

X

X

X

-

-

X

-

-

-

-

X

Case 1

X

X

-

X

-

X

X

-

X

-

-

-

-

X

Case 2

X

X

-

X

-

X

-

-

X

X

-

-

-

X

Case 3

X

-

X

X

-

X

-

X

X

-

-

-

-

X

Case 4

X

-

X

X

-

X

-

-

X

-

X

-

-

X

Case 5

X

-

X

X

-

X

-

-

X

-

-

-

X

X

Case 6

X

-

X

-

-

-

-

-

X

-

X

X

-

X

Case 7

X

-

X

-

-

X

-

X

X

-

-

-

X

X

Case 8

X

-

X

-

-

X

-

-

X

-

X

-

-

X

Case 9

X

X

X

-

-

X

X

X

-

-

-

-

-

X

Case 10

X

X

X

-

-

-

-

-

X

X

X

-

-

X

Note:

Maximum 72 satellites tracked simultaneously.

3.2

RF front end (G5RF)

The integrated RF front-end is able to support different bands (L1, L2, L5, and E6) thanks to a programmable and

flexible RF-IF chain driven by a fractional PLL.

The RF_IF chain is followed by a 3-bit ADC able to convert the IF signal to Sign (SIGN) and Magnitude (MAG1,

MAG0) bit. The MAG bit is internally integrated in order to control the variable gain amplifiers.

The embedded fractional PLL allows supporting a wide range of reference clocks (10 to 55 MHz).

3.3

Multi-band multi-constellation base band (G5BB) processor

STA8135GA integrates G5BB proprietary IP, which is the STMicroelectronics latest generation high-sensitivity

baseband processor fully compliant with all different constellations and bands: GPS, Galileo, Glonass, BeiDou,

NAVIC (former IRNSS) and QZSS systems.

STA8135GA

General description

DB4575 - Rev 1

page 13/29