This is the San Diego receiving site, with it's interferometer array of 12 antennas, each composed of 96 dipoles over a wire ground screen. With a 1700' baseline, the interferometer can measure the angle of arrival of the incoming radar signal to within .01 degree accuracy. The system performs un-alerted detection of all satellites passing through the fence, not requiring any advance information about the satellites. An "alert" channel Fast Fourier Transform watches over the entire doppler shifted passband for signals to appear, then steers one or more FFT data processing modules to capture amplitude and phase. Approximately one second's worth of data is packetized and sent to Dahlgren for further processing. The system makes on average one satellite observation every 10 seconds.