58 Simulation results of interference criteria to pulse radars Simulation result of radar A12 Simulation result of radar G20 TABLE 21 Simulation calculation results of interference criteria for pulse radars Pulse Repeat Type of Bandwidth Pj-av Pj-peak N width period radar (MHz) (dBm) (dBm) (dBm) (μs) (μs) A12 15 20 4 30.5 28.7 0.5 –76.7 –71.5 –102 24 30 4 35.2 33.4 5.2 –72 –66.8 G20 15 50 4 35.9 34.1 5.9 –71.3 –66.1 –102 30 50 4 37.8 36.0 7.8 –69 –64 4.2.3.2.5 Summary of results of 2 The analysis of interference simulations from EESS SAR-4 to pulse radars indicates that: the interference level keeps basically constant when the repeat period of SAR pulse – increasing, while the decreasing appearance times of interference pulse will reduce the average interference power; the interference level rises with the increasing pulse width of SAR interference signals, – which also raises the average interference power; the wanted radar signals decreases when the bandwidth of SAR signal increases, and the – interference effect becomes weaker; the pulse repetition frequency of radar does not affect the amplitude of received – interference signals from SAR, and the duration of interference is in proportion to the pulse repetition frequency of the radar; the amplitude of pulse radar received from SAR interference signals decreases with the – increase of pulse width of pulse radar, and the interference rejection capability is also enhanced. Simulations of interference for pulse radars indicate that: when the pulse width of radar A12 is 15 and 24 the allowable maximum ratio of – μs μs, average interference to noise power is 0.5 dB and 5.2 dB, respectively, and the allowable maximum ratio of peak interference to noise power is 28.7 dB and 33.4 dB, respectively; when the pulse width of radar G20 is 15 and 30 the allowable maximum ratio of – μs μs, average interference to noise power is 5.9 dB and 7.8 dB respectively, and the allowable maximum ratio of peak interference power to noise power is 34.1 dB and 36 dB, respectively.
58 Simulation results of interference criteria to pulse radars Simulation result of radar A12 Simulation result of radar G20 TABLE 21 Simulation calculation results of interference criteria for pulse radars Type of radar Pulse width (μs) Repeat period (μs) Bandwidth (MHz) Pj-av (dBm) Pj-peak (dBm) N (dBm) A12 15 20 4 –76.7 –71.5 –102 30.5 28.7 0.5 24 30 4 –72 –66.8 35.2 33.4 5.2 G20 15 50 4 –71.3 –66.1 –102 35.9 34.1 5.9 30 50 4 –69 –64 37.8 36.0 7.8 4.2.3.2.5 Summary of results of 2 The analysis of interference simulations from EESS SAR-4 to pulse radars indicates that: – the interference level keeps basically constant when the repeat period of SAR pulse increasing, while the decreasing appearance times of interference pulse will reduce the average interference power; – the interference level rises with the increasing pulse width of SAR interference signals, which also raises the average interference power; – the wanted radar signals decreases when the bandwidth of SAR signal increases, and the interference effect becomes weaker; – the pulse repetition frequency of radar does not affect the amplitude of received interference signals from SAR, and the duration of interference is in proportion to the pulse repetition frequency of the radar; – the amplitude of pulse radar received from SAR interference signals decreases with the increase of pulse width of pulse radar, and the interference rejection capability is also enhanced. Simulations of interference for pulse radars indicate that: – when the pulse width of radar A12 is 15 μs and 24 μs, the allowable maximum ratio of average interference to noise power is 0.5 dB and 5.2 dB, respectively, and the allowable maximum ratio of peak interference to noise power is 28.7 dB and 33.4 dB, respectively; – when the pulse width of radar G20 is 15 μs and 30 μs, the allowable maximum ratio of average interference to noise power is 5.9 dB and 7.8 dB respectively, and the allowable maximum ratio of peak interference power to noise power is 34.1 dB and 36 dB, respectively.
R-REP-RS.2313-2014-MSW-E.docx