Multimode/Multifrequency Low Frequency Airborne Radar Design

Table 2

System parameters.

	Sounder	SAR-Low	SAR-High
Altitude	>1300 m	>1000 m             >1000 m
Carrier	163 MHz	450 MHz	860 MHz
Tx bandwidth	10 MHz	40 MHz	80 MHz
Tx steps	1×10 MHz	4×10 MHz	8×10 MHz
PRF	500 Hz	2000 Hz	4000 Hz
Pulse width (single step)	3.3 𝜇s for all operative modes
Rx window width	10 𝜇s	8.03 𝜇s	8.03 𝜇s
Antenna type	Periodic Log	Planar array of 1×4 patch	Planar array of 2×8 patch, dual polarization
Antenna gain	7 dB	17 dB               19 dB
Elevation pointing	Nadir	45° for both SAR operative mode
Azimuth pointing	Nadir	0° for both SAR operative mode
Range aperture	68°	75°	37°
Azimuth aperture	50°	20°	10°
ADC sampling frequency	50 MHz/100 MHz for all operative mode
Peak power	200 W for all operative mode