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Chapter 3 - Receiver Descriptions

Received Carrier to Noise Density Ratio (C/No)

The Position/Status/Data Message output C/No for each receiver channel, which can be used to

determine the relative signal levels of received satellite signals (refer to Figure 3.9 below). C/No is

the received carrier to noise density ratio. The units are dB-Hz, where No is the noise density

ratio received in a 1 Hz bandwidth. The C/No may be converted into received signal strength

using the plot in Figure 3.9.The satellite signal strength is measured at the antenna input. Typical

"good" C/No numbers reported by an M12+ with a properly installed antenna system are between

40 and 55 dB-Hz.

Figure 3.9: Approximate Signal Strength vs. Reported C/No

Motorola GPS Products - M12+ User's Guide Revision 6.X 09FEB05

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Motorola M12 Oncore Betriebsanweisung Seite 54