Abstract
The article describes modern approaches to the choice and synthesis of modulating functions used for various purpose radio system signal generation.
Highlights
Synthesized aperture radars (SAR) tend to occupy the more significant position as a facility of remote Earth sensing [1]
The wider is the scope of problems to solve using radar images, the vaster is the circle of customers requiring high radar resolution and image quality and possibility of obtaining exact geometry of ground objects and their mutual position, electrodynamical and radiometrical properties of the terrain
Main lobe level is responsible for SAR energetic characteristics, spatial resolution depends on main lobe width, and radiometric performances can be explained in terms of integral sidelobe level
Summary
Synthesized (or, more often called, synthetic) aperture radars (SAR) tend to occupy the more significant position as a facility of remote Earth sensing [1]. This fact can be explained with SAR having a set of advantages such as providing high spatial resolution by range and azimuth comparable with that of optical instruments, availability of various survey modes and radar data processing algorithms, independence on daytime and weather conditions, operability. The wider is the scope of problems to solve using radar images, the vaster is the circle of customers requiring high radar resolution and image quality and possibility of obtaining exact geometry of ground objects and their mutual position, electrodynamical and radiometrical properties of the terrain. The purposes of SAR mission and the priority of problems it is designed to solve determine sounding signal parameters such as carrier frequency, bandwidth, modulation type and pulse repetition frequency [2]
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