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%TY @@calculate the SNR at (1/2)/1:09 he targe CS be at Solved Problems.pdf from both are 1.22. A MilliMeter Wave (MMW) radar has the following specifications: operating frequency fo = 94GHz, PRF f, = 15 KHz, pulse width t = 0.05ms, peak power P, = 10W, noise figure F = 5dB, circular antenna with diameter D = 0.254m, antenna gain G = 30dB, target RCS o = 1m², system losses L = 8dB, radar scan time T = 3s, radar angular coverage 200°, and atmospheric attenuation 3dB/Km. Compute the follow ing: (a) wavelength λ; (b) range resolution AR; (c) bandwidth B; (d) the SNR as a function of range; (e) the range for which SNR= 15dB; (f) antenna beam width; (g) antenna scan rate; (h) time on target; (i) the effective maxi mum range when atmospheric attenuation is considered. 1.23. Repeat Example 1.5 with 2 = 4°, o = 1m², and R = 400Km. 1.24. Using Eq. (1.80), compute (as a function of B₁/B) the crossover range for the radar in Problem 1.22. Assume P, = 100W, G, = 10dB, and L₁ = 2dB. 1.25. Using Eq. (1.80), compute (as a function of B₁/B) the crossover range for the radar in Problem 1.22. Assume P, = 200W, G, = 15dB, and L₁ = 2dB. Assume G = 12dB and R, = 25 Km. 14 ZAIN IQ III. 1.26. A certain radar is subject to interference from an SSJ jammer. Assume the following parameters: radar peak power P, = 55KW, radar antenna gain G = 30dB, radar pulse width t = 2μs, radar losses L = 10dB, jammer power P, = 150W, jammer antenna gain G, = 12dB, jammer bandwidth B, = 50MHz, and jammer losses L, = 1dB. Compute the crossover range for a 5m² target. 1.27. A radar with antenna gain G is subject to a repeater jammer whose antenna gain is G,. The repeater illuminates the radar with three fourths of the incident power on the jammer. (a) Find an expression for the ratio between the power received by the jammer and the power received by the radar; (b) what is this ratio when G = G, = 200 and R/λ = 10³? 1.28. Using Fig. 1.30 derive an expression for R,. Assume 100% synchro nization between the transmitter and receiver. 1.29. An Xband airborne radar transmitter and an airtoair missile receiver act as a bistatic radar system. The transmitter guides the missile toward its tar تم %TY @@calculate the SNR at (1/2)/1:09 he targe CS be at Solved Problems.pdf from both are 1.22. A MilliMeter Wave (MMW) radar has the following specifications: operating frequency fo = 94GHz, PRF f, = 15 KHz, pulse width t = 0.05ms, peak power P, = 10W, noise figure F = 5dB, circular antenna with diameter D = 0.254m, antenna gain G = 30dB, target RCS o = 1m², system losses L = 8dB, radar scan time T = 3s, radar angular coverage 200°, and atmospheric attenuation 3dB/Km. Compute the follow ing: (a) wavelength λ; (b) range resolution AR; (c) bandwidth B; (d) the SNR as a function of range; (e) the range for which SNR= 15dB; (f) antenna beam width; (g) antenna scan rate; (h) time on target; (i) the effective maxi mum range when atmospheric attenuation is considered. 1.23. Repeat Example 1.5 with 2 = 4°, o = 1m², and R = 400Km. 1.24. Using Eq. (1.80), compute (as a function of B₁/B) the crossover range for the radar in Problem 1.22. Assume P, = 100W, G, = 10dB, and L₁ = 2dB. 1.25. Using Eq. (1.80), compute (as a function of B₁/B) the crossover range for the radar in Problem 1.22. Assume P, = 200W, G, = 15dB, and L₁ = 2dB. Assume G = 12dB and R, = 25 Km. 14 ZAIN IQ III. 1.26. A certain radar is subject to interference from an SSJ jammer. Assume the following parameters: radar peak power P, = 55KW, radar antenna gain G = 30dB, radar pulse width t = 2μs, radar losses L = 10dB, jammer power P, = 150W, jammer antenna gain G, = 12dB, jammer bandwidth B, = 50MHz, and jammer losses L, = 1dB. Compute the crossover range for a 5m² target. 1.27. A radar with antenna gain G is subject to a repeater jammer whose antenna gain is G,. The repeater illuminates the radar with three fourths of the incident power on the jammer. (a) Find an expression for the ratio between the power received by the jammer and the power received by the radar; (b) what is this ratio when G = G, = 200 and R/λ = 10³? 1.28. Using Fig. 1.30 derive an expression for R,. Assume 100% synchro nization between the transmitter and receiver. 1.29. An Xband airborne radar transmitter and an airtoair missile receiver act as a bistatic radar system. The transmitter guides the missile toward its tar تم
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