GPS C/N 與 SNR

Source : http://webcache.googleusercontent.com/search?q=cache:qtdO06xlgmsJ:lausai360.blogspot.com/2017/08/gps-cn-snr.html+&cd=7&hl=zh-TW&ct=clnk&gl=tw

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
http://www.insidegnss.com/node/2397