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Radlab /
ParametersTableTable of optimum parameters for various frequencies A few assumptions: velocity resolution is imposed to be 2 cm/s; modulation bandwidth is 1% of frequency; Doppler spectral width = 6x Bragg velocity to ensure look-alike spectra; phased array is 12 antennas; VOP is 0.66. Broadening by windowing (i.e. Blackman against rectangular) not taken into account for the computation of the range and velocity resolutions. Computation sequence: given F, compute L, l and cb. Given B linked to F, compute d. Given F, compute D and m. Given v and L, compute T. Given cb, compute V. Given V and L, compute t. Given t and T, compute n. Given t and m, compute b. Param 12 MHz 15 MHz 30 MHz 50 MHz 150 MHz unit L 25 20 10 6 2 m cb 4.42 3.95 2.79 2.16 1.25 m/s B 120 150 300 500 1,500 kHz d 1.25 1.0 0.5 0.3 0.1 km D 150 120 60 36 12 km m 120 120 120 120 120 # cells v 2 2 2 2 2 cm/s T 1250 1000 500 300 100 s V 26.5 23.7 16.7 13 7.5 m/s t 0.471 0.422 0.299 0.231 0.133 s 1/t 2.12 2.37 3.34 4.33 7.52 Hz/RC b 255 284 401 520 902 Hz n 2654 2370 1672 1299 752 # chirps L/2 (air) 12.5 10 5 3 1 m 11*L/2 (air) 137.5 110 55 33 11 m L/4 (cable) 4.125 3.30 1.65 0.99 0.33 m |