By Mark A Richards; James A Scheer; William A Holm
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Extra resources for Principles of modern radar / *Vol. 1*@Basic priciples
This condition (sometimes called skip) is most prominent in the high-frequency (HF) region (3–30 MHz) and is generally not encountered above 150 MHz. Radars that use this phenomenon are called over-the-horizon (OTH) radars. Chapter 4 describes the details associated with atmospheric refraction. 4 Reflection Incident EM waves induce an electric charge on natural surfaces or the surface of a manmade object, and that object reradiates the EM wave. The reradiation of the EM wave from the surface matter of an object is called scattering or, more often, reflection of the incident wave.
4 The phenomenon of diffraction is responsible for the formation of the antenna pattern and antenna beam (or main lobe of the antenna pattern) as well as the sidelobes. Consider a circular (diameter D) planar antenna made up of many (N) radiating elements, each of which is emitting EM waves of equal amplitudes over a wide range of angles. Figure 1-10 is the photograph of such an antenna. Assume that all the waves are in phase as they are emitted from the antenna elements. 2 and Chapter 9 for discussions of the antenna far field), all the waves will have essentially traveled the same distance and, therefore, will all still be in phase with each other.
1 3 4 5 11 18 25 27 33 36 54 55 55 56 ✪ INTRODUCTION Radar systems have evolved tremendously since their early days when their functions were limited to target detection and target range determination. In fact, the word radar was originally an acronym that stood for radio detection and ranging. Modern radars, however, are sophisticated transducer/computer systems that not only detect targets and determine target range but also track, identify, image, and classify targets while suppressing strong unwanted interference such as echoes from the environment (known as clutter) and countermeasures (jamming).
Principles of modern radar / *Vol. 1*@Basic priciples by Mark A Richards; James A Scheer; William A Holm