GEM1305
GEM1305-4540A0
GEM1305 is a high performance dual-band RTK module with build-in antenna, which is based on CYNOSURE series chipset.
It supports BDS-3
signals, along with global civil navigation systems, including GPS, BDS, GLONASS, Galileo, QZSS,
and SBAS.
Feature
- Supports GPS, BDS, GLONASS, Galileo, QZSS, and SBAS
- Integrated Real Time Kinematics (RTK)
- State-of-the-art low power consumption design
- Supports multi-band multi-system high precision raw data output, easy for 3rd party integration
- The best cost-effective high precision GNSS positioning solution integrated with antenna
- Compact size 55*55*15mm with high performance
| P/N | Details |
|---|---|
| GEM1305-4540A00 | Based on CYNOSURE III GNSS SoC |
| GEM1305-4540A01 | Based on CYNOSURE IV GNSS SoC |
Specifications
Antenna
| Item | Specs |
|---|---|
| Frequency Range(MHz) | GPS/QZSS L1,L5, BDS B1,B2, GLONASS L1, GALILEO E1/E5a |
| Polarization | Right-hand circular |
| Gain(dBi) | 90° L1≥5.5 L2≥5 L5≥2.5 |
| Phase center error(mm) | ≤±2.0 |
| Axial Ratio (dB) | 90°≤3.0 |
| LNA Gain(dB) | 38±2 |
| V.S.W.R | ≤2.0 |
| Noise Figure (dB) | ≤1.8 |
| DC Voltage (V) | 5.0～5.5 |
| Current (mA) | ≤80mA |
| Impedance(Ω) | 50 |
| Relative Humidity | 95% |
| Operating Temperature(℃) | -40～+85 |
| Storage Temperature (℃) | -55～+85 |
| Dimensions(mm) | 55 x 55 x 13 |
| Weight (g) | 50g |
GNSS
| Parameter | Specifications | ||
|---|---|---|---|
| Constellations | BDS, GPS, QZSS, GLONASS, Galileo, NavIC, SBAS | ||
| Channel | 128 | ||
| Update rates | 10Hz | ||
| Position accuracy | GNSS | 1.0m CEP | |
| SBAS | ＜1.0m CEP | ||
| RTK | 1.0 cm + 1 ppm (H) 2.0 cm + 1 ppm (V) | ||
| Velocity & Time accuracy | GNSS | 0.05 m/s CEP | |
| 1PPS | 20ns RMS | ||
| TTFF | Hot start | 1s | |
| Cold start | 27s | ||
| RTK | Convergence time | <10s | |
| Reliability | ＞99.9% | ||
| Sensitivity[1] | Cold start | -148 dBm | |
| Hot start | -155 dBm | ||
| Reacquisition | -158 dBm | ||
| Tracking & navigation | -165 dBm | ||
| Protocol | NMEA-0183 | ||
| RTCM 2.X, RTCM 3.X | |||
| Baudrate | 230400 bps, by default | ||
| Operating condition | Main supply | 5V | |
| Digital I/O supply | 1.75V to 3.63V | ||
| Backup supply | 1.62V to 3.63V | ||
| Power consumption | Tracking | GNSS | 30 mA @ 3.3V |
| Single system | 18 mA @ 3.3V | ||
| Standby | Data backup | 16 uA | |
| RTC | 1.4 uA | ||
| Serial interface | UART | 2 | |
| SPI[2] | - | ||
| I2C[2] | - | ||
| Operating limit | Velocity | 515 m/s | |
| Altitude | 18,000m | ||
| Environmental conditions | Operating temp. | -40°C to +85°C | |
| Storage temp. | -40°C to +90°C | ||
| Humidity | 95% RH | ||
[1] tested with a good external LNA
[2] Supported upon request with special firmware
Hardware Description
CON_0(J6): 1.25mm pitch 6P connector Pinout:
- GND
- NC
- Rx0 of GNSS module
- Tx0 of GNSS module
- 5V, input,max current:200mA
CON_1(J5): Pin header connector 2.54mm
- GND
- NC
- Tx1 of GNSS module
- Rx1 of GNSS module
- 5V
UART0 can be used for firmware upgrade, while UART1 cannot.
Case study
Package list
- GEM1305 receiver
- USB-to-Serial test cable (CH340-based,Red:5V Black:GND Green:Tx White:Rx)
- 6P 1.25mm cable
