On 1/16/15 4:58 AM, Li Ang wrote:
Hi I have a question about the GPS antenna. Since the GPS signal strength on the ground is about 20db lower than the thermal noise, does the gain of antenna matter?
Not a whole lot.. Obviously, you don't want something -10dBi, and there is a direct effect of SNR and timing uncertainty (which turns into position uncertainty). If the SNR is too bad, you won't be able to acquire the signal. The PN code runs at 1 Mchip/sec, so you can look at the SNR in 1 Hz bandwidth as being 60dB higher than the received SNR.
Typically with GPS you worry more about side/back lobe performance so that you don't pick up multipath reflections.
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