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<p>Do you always tune into your favorite radio station? Notice that when you pass a decimal figure, it tends to capture a different radio station. That is because radio waves are easily interfered, and sometimes their signals overlap. That is when the output appears scrambled.</p>
<p>Radar and communications system in one radio frequency? Is that possible? Well, yes!</p>
<p>But what is radar? What is radio frequency? You may be familiar with smartphones, wireless Internet, World Wide Web, social media and Global Positioning System (GPS) but have forgotten that radio waves and radio communication still exist.</p>
<p><img src="https://s9.postimg.org/n9dyp9vpb/image.png" width="640" height="480"/></p>
<p>Radar (formed from radio detection and ranging) is a system for determining the presence, position, distance and speed of an object by bouncing radio waves off it and analyzing the reflected wave. Radio Frequency Communication (RFC) creates electromagnetic waves from a specific source and picks up those electromagnetic waves to a particular destination. The electromagnetic waves travel through the air close to the speed of light.</p>
<p><img src="https://s21.postimg.org/yz5qp5svb/radar_41443_960_720.png" width="634" height="640"/></p>
<p>The increased demand for communications technology has created congestion in the use of this particular band in the electromagnetic spectrum. To address this problem, the U.S Defense Advanced Research Projects Agency (DARPA) officials launched the Shared Spectrum Access for Radar and Communications (SSPARC) project. This project aims to enable the radar and RFC systems to share frequencies while avoiding cross-platform interference.</p>
<p><img src="https://s17.postimg.org/52cwxrwen/spectrum_16_Oct_2013.jpg" width="420" height="247"/></p>
<p>(<em>Latest contract brings to four the number of contractors for DARPA RF spectrum sharing - Military & Aerospace Electronics</em>)</p>
<p>If successful, the project will lead to a more efficient use of frequencies in the electromagnetic spectrum. Spectrum congestion, which is a growing problem, will also be reduced, thus enabling the radar and communications band to occupy together most of the desirable spectrum below 6 GHz.</p>
<p>The radio communications spectrum is theoretically broad, but the Earth's atmosphere does not allow all these frequencies to pass through. Instead, it restricts transmission to a short range of frequencies. To effectively use the available frequencies, different applications, say, broadcasting, mobile radio or navigation devices are allocated non-overlapping ranges of frequencies as indicated below.</p>
<p><img src="https://s14.postimg.org/5tugbzs4h/electromagnetic_spectrum.png" width="640" height="327"/></p>
<p>The research attempts to create a technology that will make available the range of radio frequencies indicated in the gray band for both radio communications applications and radar applications, too. Instead of non-overlapping ranges, AM/FM, TV, shortwave radio and radar and microwave can operate/broadcast within the wider band of frequencies.</p>
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<p>Image Source: <a href="http://pad1.whstatic.com/images/thumb/0/0f/Be-Caller-Number-10-to-a-Radio-Station-Step-1.jpg/728px-Be-Caller-Number-10-to-a-Radio-Station-Step-1.jpg">0</a> | <a href="http://www.afb.org/image.ashx?ImageID=7252">1</a> | <a href="https://pixabay.com/static/uploads/photo/2012/04/25/00/45/radar-41443_960_720.png">2</a> | <a href="http://www.militaryaerospace.com/content/dam/mae/online-articles/2013/10/spectrum%2016%20Oct%202013.jpg">3</a> | <a href="http://www.shieldingsystems.com/images/electromagnetic_spectrum%20.png">4 </a>|</p>
<p>Site References:</p>
<p>https://en.wikipedia.org/wiki/Frequency</p>
<p>https://en.wikipedia.org/wiki/Electromagnetic_spectrum</p>
<p>http://www.militaryaerospace.com/article/2015/03/darpa-ssparc-program.html</p>
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