Space scanning FMCW-based two-dimensional frequency diverse array radar

Abstract

The frequency-modulated continuous wave (FMCW)-based frequency diverse array (FDA) radar concept is extended to two dimensions (2D). The radar operates as a linear pulsed FMCW/FDA in the transmission (TX) mode while it operates as a pulsed FMCW/phased array (PA) in the receiving mode. It is shown that the FDA has the capability of scanning a 2D angular sector in a single pulse TX. It is shown that local instantaneous frequency bandwidth is much smaller than the radiofrequency (RF) frequency deviation of linear frequency modulation. Positive and negative slope TX/RF locations offer frequency diversity. The low signal-to-noise ratio of FDA is well compensated due to target temporal decorrelation diversity in the observation time and by the cumulative detection scheme used. Time domain and frequency domain signal processings are described. A Ku-band direct digital synthesis-based FDA radar design is compared by a corresponding equivalent PA radar.

Keywords

• direct digital synthesis
• fm radar
• signal processing
• radar antennas
• phased array radar
• frequency modulation
• cw radar
• radar signal processing
• single pulse tx
• local instantaneous frequency bandwidth
• radiofrequency frequency deviation
• linear frequency modulation
• positive slope tx/rf locations
• negative slope tx/rf locations
• frequency diversity
• temporal decorrelation diversity
• frequency domain signal processings
• ku-band direct digital synthesis-based fda radar design
• corresponding equivalent pa radar
• space scanning fmcw-based two-dimensional frequency diverse array radar
• frequency-modulated continuous wave-based frequency diverse array radar concept
• linear pulsed fmcw
• transmission mode