By Richard P. Bateson

;Heinkel He-219 Uhu [Aircraft Profile 219] КНИГИ ;ВОЕННАЯ ИСТОРИЯ Автор: Richard P. Bateson Название: Heinkel He-219 Uhu [Aircraft Profile 219] Издательство:Profile courses Ltd Год: 1972 Формат: pdf,rar+3% Размер: 19.2MB Язык: английскийСтраниц: 28Хейнкель He-219 «Сова» (Heinkel He-219 «Uhu» )— двухмоторный поршневой ночной истребитель. Первый специально спроектированный самолёт такого типа в Германии. Первый в мире боевой самолет, оснащённый катапультируемыми креслами. Один из самых эффективных самолётовВторой мировой войны.Иллюстрации-ч/б фото,схемы,чертежи и цветные рисунки zero

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PRINCIPLES OF RADAR 29 Solution. 5 mm/h? Solution. 2, with the loss resulting from the attenuation due to rain in­ cluded in the total loss LT. 7dB + 2a/? dB where a is the loss due to the rain expressed in decibels/meter. ) It is assumed that 8 a = 7 . 5 4 x 10- dB/m. 2, the range equation, expressed in decibels, is 4 ^ = 2 1 9 . 08 x 10'gR Although both sides of this equation are expressed in decibels relative to 1 m, the quantity R on the right side is in meters. , R„ = 304 km. 25 30 RADAR ELECTRONIC WARFARE or remains essentially unchanged, demonstrating the low loss experienced by a 600 MHz signal when propagating through rainfall.

Then, the inte­ grated signal-to-noise ratio is given by (S/N)1NT = N(S/N)P A good rule of thumb, according to many sources, is that the increase in the S/N ratio is approximately proportional to yjN if the radar is incoher­ ent. Actually, this is a pessimistic approximation for incoherent integration [17], but other loss mechanisms beyond this discourse justify its use. Thus, for incoherent pulse integration, (S/N)INT = ^N{S/N)P In either case, the resulting integrated signal-to-noise ratio must equal (S/N)min as required by the desired PD and PFA.

If other targets or clutter are present, especially in the vicinity of the selected target, the opera­ tor must ignore returns not coincident in time with the desired target. The range gate automates this target sorting process in the range coordinate by sampling the target return in such a way that it remains centered on the target return. Then, by providing a gating pulse, it allows only the target return or similarly delayed returns to reach later circuits. A typical range gate circuit is shown in Fig.

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