Method for evaluating landing indexes of extraterrestrial object soft landing detectors under low sampling frequency condition

Abstract

The invention discloses a method for evaluating landing indexes of extraterrestrial object soft landing detectors under a low sampling frequency condition. The method comprises the following steps of(1) autonomously calculating a landing index in real time by utilizing a satellite-based algorithm after an extraterrestrial object soft landing detector starts a soft landing process; (2) storing thelanding index according to a certain frequency and certain periodicity when the extraterrestrial object soft landing detector satisfies a landing condition; (3) downloading the landing index data stored by the soft landing detector after the ground confirms that the soft landing detector safely lands on an extraterrestrial object; and (4) analyzing and assessing the landing index data downloadedby the ground, if the landing index satisfies a soft landing task index requirement totally issued by the detector, judging that the landing index is qualified, and otherwise, judging that the landingindex is unqualified. According to the method, the obtaining of satellite-based landing states at the landing moments is realized, so that a reliable technical way is provided for the final landing state determination and landing performance assessment.

Description

technical field [0001] The invention relates to a landing index evaluation method under the condition of low sampling frequency of an extraterrestrial celestial body soft landing detector, which is suitable for the landing index evaluation in the soft landing process of extraterrestrial celestial bodies such as the moon, Mars, and asteroids, and belongs to the field of spacecraft design. Background technique [0002] Because extraterrestrial celestial bodies are far away from the earth, the configuration resources of ground deep space stations are insufficient, and at the same time, they are limited by the level of telemetry bandwidth. The telemetry downlink adopts the frame division and frequency division downlink strategy. Therefore, for extraterrestrial celestial body soft landing probes, there are problems such as long delay in telemetry data downloading, low data sampling frequency, and related telemetry in different telemetry frames. For the landing transient telemetry ...

AI Technical Summary

Problems solved by technology

At the same time, landing on the back of the moon also brought new problems. Since the back of the moon always faces away from the earth and is blocked by the moon body, the ground station cannot communicate directly with the probe. The rate is low (telemetry cycle takes 24s), and on-orbit telemetry is scarce; on the other hand, due to the limitation of the telemetry system, the telemetry time on the satellite cannot be aligned, that is, different telemetry frames are placed in different telemetry frames, resulting in inability to correlate key telemetry analyze

These factors make it impossible for the ground to fully analyze the momentary state of the probe's landing through telemetry data.

Images