Maximum unambiguous range: Difference between revisions

Latest revision as of 16:23, 25 April 2012

maximum unambiguous range

The maximum range from which a transmitted radar, lidar, or sodar pulse can be reflected and received before the next pulse is transmitted. This range, r_max, is given by r_max = cT/2, where T is the interpulse period and c is the speed of light (or speed of sound in the case of sodar).

Range is measured by the time delay between pulse transmission and reception, ordinarily assuming that the received pulse is associated with the most recent transmitted pulse. Targets at ranges beyond r_max therefore appear at ranges closer than r_max because of range folding. Special coding of the pulses permits discrimination between echoes from the most recent transmitted pulse and earlier ones, enabling the measurement of ranges beyond r_max.
See also second-trip echo, range aliasing.

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-<div class="definition"><div class="short_definition">The maximum range from which a transmitted [[radar]], [[lidar]], or  [[sodar]] pulse can be reflected and received before the next [[pulse]] is transmitted. This [[range]], ''r''<sub>max</sub>,  is given by ''r''<sub>max</sub> = ''cT''/2, where ''T'' is the [[interpulse period]] and ''c'' is the [[speed of light]] (or [[speed  of sound]] in the case of sodar).</div><br/> <div class="paragraph">Range is measured by the time delay between pulse transmission and reception, ordinarily  assuming that the received pulse is associated with the most recent transmitted pulse. [[Targets]] at  ranges beyond ''r''<sub>max</sub> therefore appear at ranges closer than ''r''<sub>max</sub> because of [[range folding]]. Special  coding of the pulses permits discrimination between echoes from the most recent transmitted pulse  and earlier ones, enabling the measurement of ranges beyond ''r''<sub>max</sub>. <br/>''See also'' [[second-trip echo]], [[range  aliasing]].</div><br/> </div>
+<div class="definition"><div class="short_definition">The maximum range from which a transmitted [[radar]], [[lidar]], or  [[sodar]] pulse can be reflected and received before the next [[pulse]] is transmitted. This [[range]], ''r''<sub>max</sub>,  is given by ''r''<sub>max</sub> = ''cT''/2, where ''T'' is the [[interpulse period]] and ''c'' is the [[speed of light]] (or [[sound|speed  of sound]] in the case of sodar).</div><br/> <div class="paragraph">Range is measured by the time delay between pulse transmission and reception, ordinarily  assuming that the received pulse is associated with the most recent transmitted pulse. [[Targets]] at  ranges beyond ''r''<sub>max</sub> therefore appear at ranges closer than ''r''<sub>max</sub> because of [[range folding]]. Special  coding of the pulses permits discrimination between echoes from the most recent transmitted pulse  and earlier ones, enabling the measurement of ranges beyond ''r''<sub>max</sub>. <br/>''See also'' [[second-trip echo]], [[range aliasing|range  aliasing]].</div><br/> </div>
 </div>