Prospects of FMCW-based frequency diverse array radar

Cetiner R., Cetintepe C., DEMİR Ş., Hizal A.

JOURNAL OF ENGINEERING-JOE, vol.2019, no.21, pp.7299-7303, 2019 (ESCI) identifier

  • Publication Type: Article / Article
  • Volume: 2019 Issue: 21
  • Publication Date: 2019
  • Doi Number: 10.1049/joe.2019.0458
  • Journal Name: JOURNAL OF ENGINEERING-JOE
  • Journal Indexes: Emerging Sources Citation Index (ESCI)
  • Page Numbers: pp.7299-7303
  • Keywords: direct digital synthesis, signal processing, phased array radar, radar signal processing, FM radar, frequency modulation, CW radar, FMCW-based frequency diverse array radar, linear frequency, linear pulsed FMCW, local instantaneous frequency bandwidth, frequency diversity, frequency domain signal processings
  • Middle East Technical University Affiliated: Yes

Abstract

The linear frequency modulated (LFM) frequency modulated continuous wave (FMCW)-based frequency diverse array (FDA) radar concept is investigated in detail. 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. The issues such as low signal-to-noise ratio (SNR) of FDA, the time-angle scanning and time-range ambiguities are studied. It is shown that the local instantaneous frequency bandwidth is much smaller than the radio frequency (RF) deviation of LFM. Positive and negative slope TX/RF locations offer frequency diversity. Time domain and frequency domain signal processings are described. A Ku band direct digital synthesis-based FMCW/FDA radar example based on the cumulative detection scheme is given and compared with an equivalent FMCW/PA radar.