This compact in-ground sensor works on the same principle as any other radar. High frequency RF pulses are transmitted, bounced off a target object, and measured by a time-gated return RF mixer. RF reflections are analyzed to produce presence, distance, and motion measurements. MicroRadar can precisely detect the onset of parking events and the clearance of cars from spaces. The radar is tuned for offset, minimum range, and maximum range based on installation configuration.
Normally they uses TDMA as over-the-air-protocol, the physical layer protocol is EEE 802.15.4 PHY, the modulation, generally is Direct Sequence Spread Spectrum Offset Quadrature Phase-Shift Keying (DSSSO-QPSK), the tx/rx bit rate is normally 250 kbps, the frequency band is comprised between 2400 and 2483.5 MHz (ISM unlicensed band) with 16 frequency channels, the channel bandwidth is 2 MHz, usually the antenna type is a ceramic patch antenna and the antenna beamwidth is ±60° (azimuth & elevation). The nominal output power is about +3 dBm and the typical receiver sensitivity is about -101 dBm. The maximum range goes by 4’ (1.2 m) to 10’ (3 m) (selectable).
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