LEA-M8F GPS, Glonass, Beidou breakout board with time & frequency reference description
This time and frequency products provide multi-GNSS synchronization for cost-sensitive network edge equipment including Small Cell and Femto wireless base-stations. The LEA-M8F module is a fully self-contained phase and frequency reference based on GNSS, but can also be used as part of a complete timing sub-system including macro-sniff Synchronous Ethernet and packet timing.
The LEA-M8F module includes a low-noise 30.72 MHz VCTCXO meeting the master reference requirements for LTE Small Cells and provides 100 ppb autonomous hold-over. The LEA-M8F module can also measure and control an external TCXO or OCXO for TD-LTE, LTE Advanced and other applications requiring extended hold-over. External sources of synchronization are supported through time-pulse and frequency inputs and a message interface.
This allows measurements from macro-sniff, Sync-E or packet timing to be combined with measurements from GNSS. u-blox time and frequency products include timing integrity alarms that report phase and frequency uncertainty both during normal operation and hold-over. They feature a high dynamic range radio with both analog and digital interference mitigation supporting their inclusion as an integral part of a local area base station design.
LEA-M8F Time & Frequency Reference Breakout Board
General Description:
- Reception of GPS, QZSS, GLONASS, BeiDou
- Integral low phase-noise 30.72 MHz system reference oscillator disciplined by GNSS
- Accurate measurement and control of external oscillators
- High sensitivity acquisition and single-satellite timing
- Automatic hold-over
- Prepared for integration with external PTP, Sync-E and network listen
- u-center u-blox Evaluation Software
- Frequency output: 30.72 MHz disciplined
Phase noise:
- 10 Hz: –90 dBc/Hz
- 10 kHz: –147 dBc/Hz
- 100 Hz: –126 dBc/Hz
- 100 kHz: –153 dBc/Hz
- 1 kHz: –140 dBc/Hz
- 1 MHz: –156 dBc/Hz
- Jitter (100 Hz - 1 MHz): 0.15 ps
- EVM (100 Hz - 1 MHz @ 2100 MHz): < 0.2%
Frequency control (internal oscillator):
- GNSS locked: 5 ppb
- Hold-over: 100 ppb, 24 hr
Frequency control (external oscillator):
- Resolution: < 5 ppb
- Frequencies: 19.2, 20, 26, 30.72 MHz
- Hold-over: Determined by external oscillator
Phase control:
- Clear sky: < 20 ns
- Indoor: 500 ns typ.
- Time-pulse input Resolution: < 50 ns
- Time-pulse output Jitter: < 2 ns
u-blox M8 positioning engine:
- 72-channel u-blox M8 engine
- GPS/QZSS L1 C/A, GLONASS L10F, BeiDou B1
- SBAS L1 C/A: WAAS, EGNOS, MSAS
- Galileo-ready E1B/C (external Flash required)
A-GPS:
- AssistNow Online and AssistNow Offline services, OMA SUPL and 3GPP compliant
Accuracy:
- GPS 2.5 m CEP
- GLONASS: < 4 m CEP
Acquisition:
- Cold starts: GPS 26 s, GLONASS 30 s
- Hot/Aided starts: GPS 1 s, GLONASS 3 s
Sensitivity:
- Tracking: GPS –167 dBm, GLONASS –158 dBm
Cold start:
- (aided): GPS –155 dBm, GLONASS –138 dBm
- (autonomous): GPS –148 dBm, GLONASS –138 dBm
- Reacquisition: –160 dBm
Assistance:
- AssistNow Online
Hardware & Features:
- LNA: Built-In
- Internal oscillator: VCTCXO
- Anti jamming: Active CW detection and removal
- Supported antennas: Active and passive
- Internal SQI Flash: For firmware update