آر اف (فرکانس رادیویی) و بی‌سیم گیرندهٔ آر‌اف

Product Attributes

Introduction

u-blox 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 TDLTE, 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 that supports their inclusion as an integral part of a local area base station design. For RF optimization, the LEA-M8F features an additional front-end LNA for easier antenna integration and dual front-end SAW filter for increased jamming immunity. LEA-M8F module uses GNSS chips qualified according to AEC-Q100. The chips are manufactured in ISO/TS 16949 certified sites and fully tested on a system level. Qualification tests are performed as stipulated in the ISO16750 standard: “Road vehicles – Environmental conditions and testing for electrical and electronic equipment”. u-blox’ AssistNow Assistance Service supplies aiding information including ephemeris, almanac, and approximate time. Along with approximate or recent position information supplied locally, these bring significant improvements in both time to first fix and acquisition sensitivity. u-blox M8 AssistNow data supports both GPS and GLONASS constellations.