TABLE 2 Pattern choices Range of 1st side-lobe level below peak (dB) Possible antenna distribution type choice Directivity pattern F(μ) Mask equation beyond pattern point where mask varies from theoretical pattern (dB) Peak pattern break point where mask varies from theoretical pattern (dB) Average pattern break point where mask varies from theoretical pattern (dB) Constant added to the peak pattern to convert it to average mask (dB) Proposed mask floor level (dB) −13.2 to −19 dB Uniform −5.75 −12.16 −3.72 −40 −20 to −30 dB COS −14.4 −20.6 −4.32 −50 −31 to −38 dB COS2 −22.3 −29.0 −4.6 −60 −39 dB or more COS3 −31.5 −37.6 −4.2 −70
Antenna elevation beamwidth degrees 0.92 2.0 1.6-2.7 0.9-1.5 Antenna azimuthal beamwidth degrees 0.92 2.0 1.6-2.7 0.9-1.4 Antenna horizontal scan rate degrees/s 18 18 and full manual slewing Not applicable Not applicable Antenna horizontal scan type (continuous, random, 360°, sector, etc.) 360° and sector 360° and sector Irregular to 360o Irregular to cover 360o Antenna vertical scan rate degrees/s 14 steps in 5 min Not applicable Not applicable Antenna vertical scan type (continuous, random, 360°, sector, etc.) degrees Fixed steps: 0.5-20 2.0 to +60 Irregular to cover required volume Irregular to cover required volume Antenna side lobe (SL) levels (1st SLs and remote SLs) dB 20 +15 (estimated) 17 on transmit, 25 on receive 17 on transmit, 25 on receive Antenna height m 30 30 Variable Variable Receiver IF bandwidth MHz 0.63 at –3 dB 0.25 at –3 dB (long pulse) 0.5 at –3 dB (short pulse) 1.2 at –6 dB (short pulse) 1.8 at –6 dB (long pulse) 1.2 at –6 dB (short pulse) 1.6 at –6 dB (long pulse) Receiver noise figure dB 2.1 9.0 < 6 < 6 Minimum discernible signal dBm –115 110 –110 –110 Receiver front-end 1 dB gain compression point dBm –17 32 10 10 Receiver on-tune saturation dBm –10 N/A N/A TABLE 1 (end) Characteristics Radar 1 Radar 2 Radar 3 Radar 4 Receiver RF 3 dB bandwidth MHz 1.6 0.5 (long pulse) 1.5 (short pulse) 200 300 Receiver RF and IF saturation levels and recovery times dBm µs –10, 1 13 < 0.5 13 < 0.5 Doppler filtering bandwidth Hz 95(1) (estimate) Interference-rejection features Geographical distribution Worldwide Fraction of time in use % 100
Antenna type (reflector, phased array, slotted array, etc.) metal parabolic Parabolic Parabolic Parabolic Solid parabolic Antenna polarization Vertical Horizontal Horizontal Horizontal Horizontal Antenna main beam gain dBi 39 44 50 40 40 Antenna elevation beamwidth degrees 4.8 0.95 < 0.55 < 1.0 1.65 Antenna azimuthal beamwidth degrees 0.65 0.95 < 0.55 < 1.0 1.65 Antenna horizontal scan rate degrees/s 0.65 0-36 (0-6 rpm) 21-24 30-48 30-48 Antenna horizontal scan type (continuous, random, 360⁰, sector, etc.) degrees 360 360 Continuous 360 Sector 360 360 Antenna vertical scan rate degrees/s N/A N/A 15 15 15 Antenna vertical scan type (continuous, random, 360⁰, sector, etc.) degrees N/A N/A Stepwise, 0.5-60 Stepwise, –2 to +60 –1 to +60 Antenna sidelobe (SL) levels (1st SLs and remote SLs) dB –26 –35 –27 –25 –25 Antenna height m 30 10 30 30 30 Receiver IF 3 dB bandwidth MHz 0.5 20 0.91 0.6 0.25 to 0.5 Receiver noise figure dB 7 4 2.3 3 3 . TABLE 8 (cont.) Characteristics Units Radar 6 7 Radar 8 Radar 9 Radar 10 Minimum discernable signal dBm –110 –97 –109 –109 to –112 –114 Tuning range MHz 5 600-5 650 5 600-5 650 5 250-5 725 5 600-5 650 5 600-5 650 Modulation Conventional With Doppler capability With Doppler capability With Doppler capability With Doppler capability (including noise calibration w/o emission)
Minimum discernable signal dBm 113 to 120 113 to 120 113 to 118 30 to 54 (at 1 km) 107 to 115 TABLE 8 (cont.) Characteristics Units Radar 11 Radar 12 Radar 13 Tuning range MHz 5 250-5 350 5 330-5 370 5 250-5 370 Modulation Conventional With Doppler capability With Doppler capability Tx power into antenna kW peak 250 250 200 width s 2.5-2.8 1 and 2.5 1 Pulse rise/fall time s 0.1-0.8 0.1-0.9 0.2-0.5 repetition rate pps 260 260-1 500 400-2 000 Output device Coaxial magnetron Klystron Klystron Antenna pattern type (pencil, fan, etc.) Pencil Pencil Pencil Antenna type (reflector, phased slotted array, etc.) Parabolic Parabolic Parabolic Antenna polarization Horizontal Horizontal Horizontal Antenna main beam gain dBi 41-45 42-45 48-50 Antenna elevation beamwidth degrees 1-1.5 1-1.2 0.58-0.65 Antenna azimuthal beamwidth degrees 1-1.5 1-1.2 0.6-0.65 Antenna horizontal scan rate degrees/s 24 6-36 12/24 Antenna horizontal scan type (continuous, random, 360, sector, etc.) degrees 360 360 360 Antenna vertical scan rate degrees/s –2 to +45 within 15 s –2 to +45 within 15 s −2 to +90 within 10 s TABLE 8 (cont.) Characteristics Radar 11 Radar 12 13 Antenna vertical scan type (continuous, random, 360, sector, etc.) degrees –2 to +45 –2 to +45 –2 to +90 Antenna sidelobe (SL) levels (1st SLs and remote SLs) dB –25 to –33 –26 to –35 –28 to –34 Antenna height m 18 to 53 10 to 60 33 to 44