Clock modules get timing from GPS, GLONASS and BeiDou

NEO-M8T and LEA-M8T are precision timing modules from u-blox, that work concurrently from GPS, GLONASS and BeiDou, and are Galileo-ready.

Accuracy is said to be within 20ns and the receivers autonomously cold start on a -148dBm signal or, when aided (see below), -157dBm (GPS and GLONASS, or 151dBm for GPS and BeiDou).

12.2 x 16.0mm NEO-M8T is intended for applications such as geophones used for seismic field measurements. LEA-M8T is 17.0 x 22.4mm.

The LEA version includes a SAW filter and antenna power supervision and can be used with active antennas or antenna signal distribution systems. NEO includes an additional LNA, improving performance when connected directly to a passive antenna, and has support for external antenna supply management if required.

Both modules have field-upgradeable flash memory, and communication is through UART, SPI and I2C-compatible DDC interfaces.

“These modules are the industry’s highest performance GNSS [global navigation satellite systems] timing modules in terms of accuracy, reliability and power consumption,” claimed u-blox marketing v-p Thomas Nigg.

Two time-pulse outputs are available, configurable from once per minute up to 10MHz. The modules also output multi-GNSS raw data, including carrier phase, code phase and pseudo-ranges. Time according to any international standard can be delivered, including calibration of inter-constellation offsets. Low duty cycle operation is supported to reduce power consumption for battery-power.

“The M8T timing modules are delivered in u-blox’ established LEA and NEO form-factors with standardised pin-out, allowing ready migration from previous product generations,” said Tim Bonnett, chief sales officer of Alpha Micro Components, which is stocking the modules. “U-blox timing products can make optional use of u-blox AssistNow or industry standard aiding data. This reduces the time to first fix and delivers exceptional acquisition sensitivity, even on first installation before precise location or time is known.”

steve bush

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via Yuichun