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This summary is machine-generated.

We developed a novel space lidar for planetary missions, enhancing topographic mapping and landing support. This system utilizes a unique return-to-zero pseudo-noise (RZPN) lidar technique for accurate long-distance ranging and wide dynamic range measurements.

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lidarpseudo-noise coderemote sensing

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Area of Science:

  • Planetary Science
  • Optical Engineering
  • Remote Sensing

Background:

  • Topographic mapping and landing support are critical for space missions to small planetary bodies.
  • Existing lidar systems face challenges with dynamic range and background noise in diverse space environments.

Purpose of the Study:

  • To develop a versatile space lidar instrument for small planetary body missions.
  • To enable precise topographic mapping and aid in sample collection or landing operations.
  • To overcome limitations of traditional lidar in terms of dynamic range and noise reduction.

Main Methods:

  • Implementation of a fiber laser transmitter modulated with a return-to-zero pseudo-noise (RZPN) code.
  • Utilizing a receiver that correlates the detected signal with the RZPN kernel, setting it to zero outside firing windows to minimize background noise.
  • Employing a multi-pixel linear mode photon-counting HgCdTe avalanche photodiode (APD) array for sensitive detection in the near to mid-infrared spectrum.
  • Designing a modular instrument with adjustable laser power and detector gain for a wide measurement dynamic range and reconfigurable modulation patterns.

Main Results:

  • Demonstration of a new lidar technique enabling long-distance ranging without aliasing, using low peak-power, high pulse-rate lasers.
  • Achieved a wide measurement dynamic range through adjustable laser power and detector gain.
  • The RZPN lidar effectively removes background noise, improving measurement accuracy.
  • The instrument's modular design allows for adaptation to various mission phases and environments.

Conclusions:

  • The developed space lidar is a significant advancement for planetary exploration, offering enhanced capabilities for mapping and landing.
  • The RZPN lidar technique provides a robust solution for accurate ranging and noise reduction in space-based applications.
  • The instrument's versatility and reliance on industry-standard components make it suitable for a broad range of future space missions.