LR915X/LR935X/LR955X family of products utilized SiRFstarV ™ and features Quad-GNSS for tracking GPS, GLONASS, BDS and Galileo satellites. The product family delivers highly accurate continuous location, advanced power management and high interference immunity. These continue to push the envelope of performance in sensitivity, TTFF and urban canyon availability and accuracy. With a built-in DSP and extremely low power consumption, the family can get fast location fixes for geo-tagging images or videos, asset tracking and wearable applications.
Performance
GPS, GLONASS, Galileo, BDS and SBAS reception for high GNSS availability and accuracy
High sensitivity navigation engine (PVT) tracks as low as
GPS : -165 dBm
GLONASS : -159 dBm52 track verification channels
SBAS (WAAS or EGNOS,MSAS)
Active Jammer Remover, removes in-band jammers up to 80 dB-Hz
Tracks up to 8 CW jammers
Multimode A-GPS (Autonomous, MS-Based, and MS-Assisted), need operator support.
Embedded CGEE / SGEE (With back-end server support) speed up TTFF a lot and makes cold start time to be around 20+ seconds.
SiRFGeoRecovTM Reverse EE makes positioning process being done under power saving mode.
Reacquisition Time : 0.1 second
RF Metal Shield for best performance in noisy environments
Based on the high performance features of the SiRFstarV™ low power single core logic.
Adaptive micropower controller
Only 50 to 500μA maintains hot start capability (core logic)
< 10mW required for TricklePower™ mode
RoHS compliant (lead-free)
Advanced navigation features
Smart sensor supported by I²C interface
External interrupt input for context change detection
Built-in LNA.
Built-in internal ROM and based on Firmware 5.5.X
It can remove in-band jammer up to 80db-Hz and track up to 8CW jammers, so the module can prevent GPS signal interference when design-in the electrical device with noisy electrical signal interferences such as Laptop, mobile phone, DSC, etc.
Maintain tracking sensitivity as low as GPS @ -163dBm, GLONASS @ -161dBm, even without network assistance. (SiRFstar III has only -159dBm sensitivity)
Support SiRFaware™ technology
Support adaptive"Micro Power Controller"power management mode.
< 10mW TricklePower™, so user can leave power on all day instead of power off.
Suitable for battery drive devices that need lower power consumption application
Ideal for high volume mass production(Taping reel package)
Cost saving through elimination of RF and board to board digital connectors
Flexible and cost effective hardware design for different applications
Embed CGEE (Client Generated Extended Ephemeris) that can capture ephemeris data from satellites locally and predicts ephemeris up to 3 days. So if the module was off within 3 days, it could complete positioning process with limited time just like hot start.
Hardware and Software
Advantages
Specification
| Feature | Item | Description |
| Chipset | GSD5e/ROM base | SiRF starV low power single chipset |
| General | Frequency GPS | L1, 1575.42 MHz |
| Frequency GLONASS | L1, 1602~1615 MHz | |
| C/A code | 1.023 MHz chip rate | |
| Channels | 52 | |
| Sensitivity GPS | -165 dB | |
| Sensitivity GLONASS | -161 dB | |
| Accuracy | Position | <2.5 meters |
| Velocity | 0.01 meters/second | |
| Time | 1 uS synchronized to GPS time | |
| Datum | Default | WGS-84 |
| Other | selectable for other Datum | |
| Time to First Fix(TTFF) (Open Sky & Stationary Requirements) | Reacquisition | 0.1 sec., average |
| Snap start | 1 sec., average | |
| Hot start | 1~2 sec. | |
| Warm start | 9~15 sec. | |
| Cold start | 25~35 sec. | |
DynamicConditions | Altitude | 18,000 meters (60,000 feet) max. |
| Velocity | 515 meters/second (1000 knots) max. | |
| Acceleration | 4g, max. | |
| Jerk | 20 meters/second3, max. | |
Environmental Specification | Operating temperature range | -40 deg. C to +85 deg. C |
| Storage temperature range | -50 deg. C to +95 deg. C | |
| Humidity | Up to 95% non-condensing or a wet | |
| Bulb temperature of +35 deg. C | ||
| Jerk | 20 meters/second3, max. | |
| Power | Main power input | 1.8 VDC input |
| Power consumption | Average 60mA (Tracking Mode) | |
| Backup Power(V_RTC) | 1.8 V DC battery input | |
| Serial Port | Electrical interface | Default UART |
| Protocol messages | NMEA-0183@9600 bps | |
| Physical Specification | 20 x 20 x 7 ± 0.5mm | |
