Purpose

This paper aims to report the first iteration on the Light Detection and Ranging (LIDAR) Engineering Model altimeter named HELENA. HELENA is a Time of Flight (TOF) altimeter that provides time-tagged distances and velocity measurements. The LIDAR can be used for support near asteroid navigation and provides scientific information. The HELENA design comprises two types of technologies: a microchip laser and low noise sensor. The synergies between these two technologies enable developing a compact instrument for range measurements of up to 14 km. Thermal-mechanical and radiometric simulations of the HELENA telescope are reported in this paper. The design is subjected to vibrational, static and thermal conditions, and it was possible to conclude by the results that the telescope is compliant with the random vibration levels, the static load and the operating temperatures.

Design/methodology/approach

The Asteroid Impact & Deflection Assessment (AIDA) is a collaboration between the NASA DART mission and ESA Hera mission. The aim scope is to study the asteroid deflection through a kinetic collision. DART spacecraft will collide with Didymos-B, while ground stations monitor the orbit change. HERA spacecraft will study the post-impact scenario. The HERA spacecraft is composed by a main spacecraft and two small CubeSats. HERA will monitor the asteroid through cameras, radar, satellite-to-satellite doppler tracking, LIDAR, seismometry and gravimetry.

Findings

The HELENA design comprises two types of technologies: a microchip laser and low noise sensor. The synergies between these two technologies enable developing a compact instrument for range measurements of up to 14 km.

Originality/value

In this paper is reported the first iteration on the LIDAR Engineering Model altimeter named HELENA. HELENA is a TOF altimeter that provides time-tagged distances and velocity measurements. The LIDAR can be used for support near asteroid navigation and provides scientific information. The HELENA design comprises two types of technologies: a microchip laser and low noise sensor. The synergies between these two technologies enable developing a compact instrument for range measurements of up to 14 km.

中文翻译：

---

用于 HERA 航天器的激光雷达高度计概念

目的

本文旨在报告名为 HELENA 的光检测和测距 (LIDAR) 工程模型高度计的第一次迭代。HELENA 是一种飞行时间 (TOF) 高度计，可提供带有时间标记的距离和速度测量值。激光雷达可用于支持小行星附近的导航并提供科学信息。HELENA 设计包括两种技术：微芯片激光器和低噪声传感器。这两种技术之间的协同作用使得能够开发出一种用于长达 14 公里的距离测量的紧凑型仪器。本文报道了海伦娜望远镜的热机械和辐射模拟。该设计受到振动、静态和热条件的影响，结果可以得出结论，望远镜符合随机振动水平，

设计/方法/方法

小行星撞击和偏转评估 (AIDA) 是 NASA DART 任务和 ESA Hera 任务之间的合作项目。目标范围是通过动力碰撞研究小行星的偏转。DART 航天器将与 Didymos-B 相撞，同时地面站监测轨道变化。HERA 航天器将研究撞击后情景。HERA 航天器由一个主航天器和两个小型立方体卫星组成。HERA 将通过摄像头、雷达、星对星多普勒跟踪、激光雷达、地震测量和重力测量来监测这颗小行星。

发现

HELENA 设计包括两种技术：微芯片激光器和低噪声传感器。这两种技术之间的协同作用使得能够开发出一种用于长达 14 公里的距离测量的紧凑型仪器。

原创性/价值

本文报道了名为 HELENA 的激光雷达工程模型高度计的第一次迭代。HELENA 是一款 TOF 高度计，可提供带有时间标记的距离和速度测量值。激光雷达可用于支持小行星附近的导航并提供科学信息。HELENA 设计包括两种技术：微芯片激光器和低噪声传感器。这两种技术之间的协同作用使得能够开发出一种用于长达 14 公里的距离测量的紧凑型仪器。