FMCW Radars - FLIR.com

each radar, and therefore, can walk at a higher speed than the velocity threshold, andstill not be detected. This deficiency gives the intruders a major advantage. Those familiarwith border operations know that intruders learn to avoid areas where they areapprehended regularly. Thus, holes in coverage inherent to Pulsed Doppler radars willbe found and exploited, nullifying the very purpose of the radars. Changing the spacingor offsetting radars in latitude will somewhat change the shape of the non-detect zones,but will not eliminate the deficiency.In summary, PD radars have an inherent flaw when used in ground surveillance applications.There is a conflicting trade off between minimizing clutter returns and theminimum detection speed of the target. Most PD radars will never detect at speeds lessthan 1.5 miles per hour (a distinct probability with walkers carrying 50 pounds or moreof contraband).INTRUDER DIRECTIONTHE FMCW ADVANTAGE - SUMMARY12 kmThe STS-12000 radar has the advantage of being designed specifically for perimeter andborder surveillance using the most optimum technology for this mission: frequencymodulated continuous wave (FMCW). The benefits of FMCW over other technologiessuch as pulse Doppler (PD) are numerous:12 km• FMCW is less complex, safer and lower cost than PD• FMCW gives low false alarm ratesAssumptionsProven in Government testing - The only radars Blind Speed to = 1.50 pass m/s stringent U.S. Air Force(2.8 mph)4 kmfalse alarm test12 kmLess likely to alarm with wind blown objects Half --- the grass detection and leaves, area has rain low doppler signatureOne FMCW installation has 31 radars netted together using only one operator• FMCW sees a higher percentage of valid targets Radars spaced 16 km apart (Typical Application)Minimum Target Speed = 2.25 mphWon’t miss slower targets or tangential ones – no holes in coverage – no onepenetrates• Smaller beamwidth for better pointing of camerasNationalBorderINTRUDER DIRECTIONINTRUDER DIRECTION12 kmNationalBorderNationalBorder12 km12 km12 kmAssumptionsBlind Speed = 1.50 m/s(2.8 mph)4 km12 kmHalf the detection area has low doppler signatureRadars spaced 16 km apart (Typical Application)Minimum Target Speed = 2.25 mphAssumptionsBlind Speed = 1.50 m/s(2.8 mph)8 km16 kmDetect Probability belowUsable LevelsMore than half the detection area has low dopplersignature for slightly slower targetRadars spaced 16 km apartMinimum Speed = 2.2 mph2800 Crystal Drive,Suite 330Arlington, VA 22202T +1.703.416.6666www.flir.comINTRUDER DIRECTIONNationalBorder12 km