Wideband phase steered array using phase shift compensation

Abstract

Phase-shift correction during a wideband linear FM pulse is shown to be a feasible technique for compensating for array fill time and beam scanning. Analytical results have been obtained for a linear array 64-wavelengths long, approximately 6.4 ft at X-band, assuming half-wavelength element spacing. Sensitivity analyses for the antenna spatial degradation and the compressed pulse degradation as a function of phase-shift quantization are presented. Data are also presented showing the signal spectrum resulting from the frequency offset generated by periodic phase-shifter increments. Calculated patterns and range response functions show that 5-bit phase shifters are sufficient for nominal degradation.<>