GPS C/N 與 SNR

markdown GPS 常會聽到 C/N 與 SNR value，這兩個東西都是用來表達 GPS 訊號強度，常常會在同樣的場景中互用 ## C/N(carrier-to-noise density) 每單位 bandwidth 的 carrier power 和 noise power 的比率 ## SNR(signal-to-noise ratio) 表示一個給定 bandwidth 的 signal power 與 noise power 的比率 這兩個值可以用公式互相換算 C/N0 (dB-Hz) = C – (N – BW) = C – N0 = SNR + BW C is the carrier power in dBm or dBW; N is the noise power in dBm or dBW; N0 is the noise power density in dBm-Hz or dBW-Hz; BW is the bandwidth of observation, which is usually the noise equivalent bandwidth of the last filter stage in a receiver’s RF front-end. Reference * [Measuring GNSS Signal Strength](https://insidegnss.com/measuring-gnss-signal-strength/)