GPS Chipset

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GPS chipsets used in GNSS/GPS devices.

Details

frequencies

  • L1 : 1575.42 MHz, C/A code 1.023 MHz

acquisition

  • cold start : GPS doesn't know anything. It has to get UTC time, almanac, and find out the satellites in view
  • warm start : GPS knows UTC time and almanac, but does not know the satellites in view
  • hot start : GPS knows UTC time, almanac, and satellites in view

sensitivity

  • acquisition : GPS has to discover the satellite
  • reacquisition : GPS knows where it should be, but lost it
  • tracking : GPS knows where it is, and follows it

DGPS, there are several forms

  • RTCM, over radio waves
  • SBAS, over satellite :
    • WAAS
    • EGNOS
    • MSAS
    • GAGAN

Vendors

SiRF

chipset frequency channels update rate (Hz) position precision (m) acquisition time (s) sensitivity (dBm) power consumption (mA) SBAS AGPS other
without aid with aid cold warm hot acquisition reacquisition tracking acquisition tracking


SiRFstarII (GSC2x) L1 12 1 10.0 5.0 45 38 8 -142 -142 -142 100 32 WAAS, EGNOS no
SiRFstarIIe/LP (GSP2e/LP) L1 12 1 10.0 5.0 45 38 8 -142 -142 -142 65 20 WAAS, EGNOS no
SiRFstarIII (GSD3tw) L1 20 1 3.0 2.5 36 36 1 -147 -155 -157 50 20 WAAS, EGNOS MS
SiRFstarIII (GSC3e/LPa) L1 20 1 2.5 2.0 35 35 1 -142 -142 -159 62 40 WAAS, MSAS, EGNOS, GAGAN no
SiRFstarIII (GSC3e/LPx, GSC3f/LPx) L1 20 1 2.5 2.0 35 35 1 -142 -155 -159 46 23 WAAS, MSAS, EGNOS MS
SiRFstarIV (GSD4t) L1 48 1 2.5 2.0 35 35 1 -148 -160 -143 47 8 WAAS, EGNOS, MSAS, GAGAN MS for smartphone
SiRFstarIV (GSD4e) L1 48 1 2.5 2.0 35 35 1 -148 -160 -143 54 10 WAAS, EGNOS, MSAS, GAGAN yes

MediaTek (MTK)

chipset frequency channels update rate (Hz) position precision (m) acquisition time (s) sensitivity (dBm) power consumption (mA) SBAS AGPS other
without aid with aid cold warm hot acquisition reacquisition tracking acquisition tracking


MT3301 L1 32 up to 5 3.0 2.5 36 33 1 -146 -156 -158 55 38 WAAS, EGNOS, MSAS no
MT3318 L1 51 up to 5 3.0 2.5 36 33 1 -146 -156 -158 58 39 WAAS, EGNOS, MSAS no
MT3329 L1 66 up to 10 3.0 2.5 35 34 1 -148 -160 -165 48 37 WAAS, EGNOS, MSAS, GAGAN yes

SkyTraq

chipset frequency channels update rate (Hz) position precision (m) acquisition time (s) sensitivity (dBm) power consumption (mA) SBAS AGPS other
without aid with aid cold warm hot acquisition reacquisition tracking acquisition tracking


Venus 5 L1 44 5 10.0 5.0 40 35 5 -135 -155 -159 65 40 WAAS, EGNOS yes
Venus 6 L1 51 acq., 14 track. 10 2.5 - 29 25 1 -148 -157 -161 67 23 WAAS, EGNOS yes
Venus 7 L1 88 1 2.5 - 29 29 1 -145 -153 -155 130 75 GPS and GLONASS

u-blox

chipset frequency channels update rate (Hz) position precision (m) acquisition time (s) sensitivity (dBm) power consumption (mA) SBAS AGPS other
without aid with aid cold warm hot acquisition reacquisition tracking acquisition tracking


u-blox 4 L1 16 4 5.0 3.0 36 33 3.5 -142 -148 -158 70 36 WAAS, EGNOS MS
u-blox 5 L1 50 4 2.5 2.0 32 32 1 -143 -160 -160 22 WAAS, EGNOS, MSAS, GAGAN yes
u-blox 6 L1 50 5 2.5 2.0 32 32 32 -146 -160 -160 59 30 WAAS, EGNOS, MSAS, GAGAN yes

See also