Your thermal noise is ok for 10MHz as ithe rule is-174dBm/Hz so for 10MHz add 10log(10^7/1) = +70 giving -104dBm.The GPS signal power on the ground is -157 dBW. The thermal noise power is ca. -104 dBm for 10 MHz bandwidth according to https://www.electronics-notes.com/a...al-noise-calculations-calculator-formulas.php. Can we say the GPS signal is burried in noise based on this relationship?
I can agree to this view. The GPS navigation signal has a data rate of 50 bit/s, it's spread to 10 MHz by modulating a pseudo random sequence. Without knowledge of this sequence, you see a noise bandwidth of 10 MHz, a receiver synchronized to the sequence reduces the noise bandwidth.Can we say the GPS signal is burried in noise based on this relationship?
SNR can be low or high for a variety of reasons. If GPS signal is below noise I believe yes it can be recovered in a good receiver as correlation is applied to pick up the flooded signal.Please refer to P.17 of this presentation: https://insidegnss.com/download/ins...wpdmdl=179382&refresh=5fe15a7d771bd1608604285
It indicates: received GNSS signals are 1000 times below the noise floor. OK, I must agree it has nothing to do with spreading sprectrum, but can we see the above mentioned GPS spectrum which is so small without additional techniques?