Design of Multi-Frequency CW Radars

Chapter 1: Frequency Modulated Continuous (FMCW) Wave Radar

1.1 FMCW RADAR CHARACTERISTICS

The need to see without being seen has been the cardinal principle of military commanders since the inception of warfare. Until the advent of the World War II, the only means available to commanders from this point of view was espionage and intelligence gathering missions behind enemy lines. Just prior to World War II, the allies came up with a groundbreaking invention, the pulsed radar. This invention radically altered the equation and for the first time in the true sense of the term one could see without being seen. The word "RADAR" is an acronym for Radio Detection And Ranging. As it was originally conceived, radio waves were used to detect the presence of a target and to determine its distance or range. The pulsed radar could sight the German fighter formations well before they reached the English coast and could, therefore, concentrate allied fighter groups where they were most needed. The German fighters were not even aware that they were detected. In effect, the pulsed radar acted as a force multiplier and helped the allies defeat the vastly superior Luftwaffe in the Battle of Britain. The allies pressed home their advantage of having the radar, by going on to win the Battle of the Atlantic against the German U-Boats by catching them unawares on the surface at nighttime when they were charging their batteries. This was truly stealth warfare in the purest sense of the term. The German reaction to these...

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