Distributed Multi-Antenna SAR Time and Phase Synchronization
Distributed multi-antenna synthetic aperture radar, in which the transmitter and receiver are mounted on separate platforms, will play a great role in radar applications. Compared to monostatic systems, such a spatial separation can offer many benefits, such as jamming and antiradiation weapons, as well as increased slow-moving target detection and identification capability via “clutter tuning”. High-precision frequency sources have undergone tremendous advances during the decades since the advent of the first laboratory cesium beam clock in 1955. Thousands of atomic clocks, such as the cesium beam and the optically pumped rubidium sources manufactured by industry, are routinely used. The frequency content of a specific deterministic signal can be found through direct application of the Fourier transform. This frequency-domain analysis is considerably more involved if the signal contains random features. The spectral nature of random signals is normally described in terms of their power spectral density.