ACCOUNTING OF VARIABLE PARAMETERS OF LINEAR FREQUENCY MODULATION IN THE IMITATOR OF REFLECTED SIGNALS FOR RADIO ALTIMETERS 

Bokov Alexander Sergeevich, candidate of technical sciences, associate professor, sub-department of radio electronics of information systems, Institute of Radioelectronics and Information Technologies – RTF, Ural Federal University named after the first President of Russia B. N. Yeltsin (620002, 32 Mira street, Ekaterinburg, Russia), a.s.bokov@urfu.ru
Vazhenin Vladimir Grigor’evich, candidate of technical sciences, associate professor, sub-department of radio electronics of information systems, Institute of Radioelectronics and Information Technologies – RTF, Ural Federal University named after the first President of Russia B. N. Yeltsin (620002, 32 Mira street, Ekaterinburg, Russia), v.g.vazhenin@urfu.ru
Gusev Andrey Victorovich, senior teacher, principal engineer, sub-department of radio electronics of information systems, Institute of Radioelectronics and Information Technologies – RTF, Ural Federal University named after the first President of Russia B. N. Yeltsin (620002, 32 Mira street, Ekaterinburg, Russia), a.v.gusev@urfu.ru
Nagashibaev Dmitry Zhubatkanovich, head of department, JSC «Ural Design Bureau «Detal» (623409, 8 Pionerskaya street, Kamensk-Uralsky, Sverdlovsk Region, Russia), dmitriy.nagashibaev@gmail.com
Iofin Alexander Aronovich, candidate of technical sciences, deputy chief designer, JSC «Ural Design Bureau «Detal» (623409, 8 Pionerskaya street, Kamensk-Uralsky, Sverdlovsk Region, Russia), tehdep630@yandex.ru

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10.21685/2307-4205-2017-3-9

To test onboard radio altimeters, which use complex types of probing signal modulation, the reflected signal simulator in some cases should adjust some echo formation parameters in real time. The proposed simulator makes it possible to conduct an end-to-end test of an operation of radar altimeters, including microwave parts, signal processing algorithms of measuring aircraft altitude above simulated underlying surface (with example of a point reflector). Experimental study of the simulator showed that the simulator can convert a probing signal copy into a signal with variable delay, attenuation and Doppler frequency shift with automatic adaptation to the slope of a linear frequency modulation and to the signal amplitude by using only probing altimeter signal.

seminatural modeling, chirp, linear frequency modulation, onboard altimeter, digital signal memory, digital signal processing