Abstract
A lidar technique employing temporally stretched, frequency chirped pulses from a 20 MHz mode locked laser is presented. Sub-millimeter resolution at a target range of 10.1 km (in fiber) is observed. A pulse tagging scheme based on phase modulation is demonstrated for range resolved measurements. A carrier to noise ratio of 30 dB is observed at an unambiguous target distance of 30 meters in fiber.
Highlights
Light detection and ranging is used for various applications such as remote sensing, altimetry and imaging [1,2,3,4]
A carrier to noise ratio of 30 dB is observed at an unambiguous target distance of 30 meters in fiber
Lidar systems based on the phase-shift measurement method offer high resolution but the modulo 2·π nature of the phase leads to range ambiguity
Summary
Light detection and ranging (lidar) is used for various applications such as remote sensing, altimetry and imaging [1,2,3,4]. Lidar systems based on the phase-shift measurement method offer high resolution but the modulo 2·π nature of the phase leads to range ambiguity. In time of flight (TOF) based lidars, short high power pulses of less than 6.7 ps duration are required for submillimeter resolution [5,6]. Narrow pulses require more bandwidth, which increases receiver noise. For unambiguous long distance measurements with TOF lidar systems, low pulse repetition frequencies (PRF) must be used to prevent aliasing. Unambiguous, photon-counting range-finding has been demonstrated, but the maximum resolution was ~1 cm [7,8]
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