Spectrum sensing technology in the space network

With the development of radio services, available spectrum resources become more and more nervous. As the current wireless network usually adopts the static spectrum allocation policy, spectrum scarcity of space is an illusion. Spectrum sensing technology can detect primary user in the time domain, frequency domain and space domain, whereby the spectrum usage. Over dynamically detecting and using idle spectrum, the utilization of the spectrum can be greatly improved. The inter-satellite links signal transmission usually adopted spread spectrum signal mode. When the primary user signal is spread spectrum signal, it is difficult to perceive the presence of primary users by available Spectrum sensing technology. In this paper, establish the GPS navigation satellite signal based on Matlab and STK software, using wavelet transform (WT) spectrum to detect the GPS signal, getting the final conclusion.