Kilohertz common light path satellite laser ranging (SLR) optical device

Abstract

The invention relates to a kilohertz common light path satellite laser ranging (SLR) optical device, belonging to laser ranging systems and comprising a reflective ranging telescope, a laser emission light path and an echo-receiving light path. The ranging telescope comprises a paraboloidal primary mirror, a paraboloidal secondary mirror and an elbow reflector; the laser emission light path comprises a kilohertz laser, a negative lens, a positive lens and a docking mirror; wherein the negative lens and the positive lens are formed a laser-expanding structure capable of adjusting a divergence angle; a coupling lens and a collimating lens in the echo-receiving light path are confocal to be formed an afocal system; the diameter of a compressed echo ray behind the collimating lens is matched with the pupil-entrance diameter of a single-photon detector; a rotary shutter is arranged in front of a focus of the echo coupling lens; an iris diaphragm is arranged on the focus of the echo coupling lens; and an optical filter is arranged in front of the single-photon detector. The kilohertz common light path SLR optical device selects a ranging frequency within 1-4 KHz, has high ranging accuracy and great echo amount and improves the ranging capability and the ranging level of the system.

Description

technical field [0001] The invention belongs to a laser ranging system, in particular to a satellite laser ranging system with a common optical path that uses the same telescope to emit laser light and receive echoes. Background technique [0002] Satellite Laser Ranging (SLR for short) is mainly used for research in the fields of precise orbit determination of artificial satellites, astro-geodynamics, geodesy, and relativity verification. Laser pulses are sent to the artificial satellite of the reflector, and after being reflected by the satellite reflector, they are received by the telescope of the ground ranging station, and the round-trip time interval t of the laser pulse from the ground measuring station to the artificial satellite is accurately measured, and the ground distance is calculated by the speed of light C The distance L between the station and the artificial satellite is as follows: [0003] L = 1 2 ...

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Problems solved by technology

However, the moment of inertia of the rotating mirror is relatively large, and the dynamic pressure generated by the continuous periodic change of the spindle angular velocity will affect the echo reception, especially when the spindle speed is too high. On the one hand, it will deflect the normal of the mirror surface of the rotating mirror, resulting in loss of echo reflection; on the other hand, it will drive the entire optical system to vibrate, seriously affecting the stability of the optical system

At the same time, the laser emission must be synchronized with the rotating mirror in this optical path, and the limitation of the spindle speed of the rotating mirror also limits the laser emission frequency accordingly. Therefore, the ranging frequency of the common optical path ranging method in the world is generally lower than 100 Hz. , kilohertz frequency ranging has not yet been implemented

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