A high-precision ranging method and system for a dual-beam microwave landing radar

Abstract

A high-precision ranging method and system for a dual-beam microwave landing radar, the steps of which are: simultaneously obtain the echoes of the landing beam irradiation area through the two beams of the antenna convex beam and the antenna concave beam; Calculate the envelope ratio of the concave beam echo; calculate the minimum value point position of the echo envelope ratio notch to obtain high-precision measurement of the beam distance; calculate the distance ratio of two distance points with the echo envelope ratio being 1 , look up the table to obtain the estimation of the incident angle of the beam center. The present invention obtains the echo of the landing beam irradiation area by configuring the convex and concave dual beams to measure the distance, and eliminates the inconsistency of the echo power distance path attenuation of each resolution unit in the beam and the asymmetric center estimation of the echo envelope caused by the existence of discrete strong scattering points The problem is that while improving the ranging accuracy, the estimated value of the incident angle of the beam center can be obtained. As an important parameter for safe landing, this technology has been applied to the design and application of the microwave landing radar system for the fourth phase of lunar exploration.

Description

technical field [0001] The invention relates to a high-precision ranging method and system for a double-beam microwave landing radar, which belongs to the field of microwave landing radar in deep space. Background technique [0002] The microwave landing radar is one of the important loads of the navigation, guidance and control (GNC) subsystem of the deep space landing probe. It provides the GNC subsystem with information such as the distance, speed and beam incident angle of the probe relative to the lunar surface during the landing and descent section to ensure landing. precision and safety. How to design a radar system to achieve high-precision calculation of the beam center and the estimation of the incident angle of the beam center is a key link in system design. The incident angle parameter is an important parameter for estimating the terrain inclination in the landing area, and it is of great significance for the judgment of landing safety. [0003] The project ori...

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Problems solved by technology

[0006] According to the research on the published domestic and foreign microwave landing radar related data, the high-precision ranging method is mainly obtained by improving the beam center calculation algorithm, which fundamentally cannot avoid the inconsistency of the echo power distance path attenuation of each resolution unit in the beam and the strong dispersion. Estimation of Asymmetric Center of Echo Envelope Caused by Scattering Points

There is no public information showing a method for estimating the angle of incidence of the beam

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