[Discuss-gnuradio] Please tell me about　recommend GPS antena and　High Frequency　Amplifier

Hi,all. I want to receive GPS L1 signal.and want to analyze location data in PC Now I use　following GPS antena USRPN200 and DBSRX2. however, GPS signal's amplitude is very small. Ican't see gps signal in FFT http://www.amazon.co.jp/%E3%83%91%E3%82%A4%E3%82%AA%E3%83%8B%E3%82%A2-GPS%E3%82%A2%E3%83%

[Discuss-gnuradio] I'm worried about How do the FFT in MATLAB

Hi,All. I'm worried about on USRP receive data How do the FFT in MATLAB? I am tty to develop software GPS receiver.　My develop plan is GPS satellite →　GPSanntena →　LNA →　DBSRX2　→　USRP N200　→　PC(in MATLAB C/A code decode and location data　Analysis ) I have a one problem that I want to do FFT usin

[Discuss-gnuradio] Anyone　do you know good GPS receiver Method?

Hi, All I have very trouble My experiment enviroment isUBUNTU 11.04 , USRP N200, DBSRX2 ,active antenna and gnuradio I am worrying about good software GPS receiver is not　exist . I want to receive L1 signal , and want to demodulate that signal However GPS signal is used Spread spectrum modulation