Double-beam microwave landing radar high-precision distance measuring method and system

Abstract

The invention discloses a double-beam microwave landing radar high-precision distance measuring method and system. The method comprises: obtaining echoes of a landing beam irradiation area at the sametime through two beams of an antenna convex beam and an antenna concave beam; the landing radar signal processor calculating the envelope ratio of the convex beam echo and the concave beam echo; calculating the minimum value point position of the echo envelope ratio notch to obtain high-precision measurement of the beam distance; and calculating the distance ratio of two distance points with theecho envelope ratio of 1, and looking up a table to obtain the estimation of the beam center incident angle. Echo waves of a landing wave beam irradiation area are obtained at the same time through configuration of convex-concave double wave beams for distance measurement. The problem of echo envelope asymmetric center estimation caused by discrete strong scattering points due to inconsistent echopower distance path attenuation of each resolution unit in the wave beam is eliminated. While the ranging precision is improved, an estimated value of a beam center incident angle can be obtained andserves as an important parameter of safe landing, and the technology is already applied to design and application of a lunar exploration four-stage microwave landing radar system at present.

Description

technical field [0001] The invention relates to a high-precision ranging method and system for a dual-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 beam center calculation and beam center incidence angle estimation 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 originated from the prototype...

AI Technical Summary

Problems solved by technology

[0006] Based on the investigation of the published domestic and foreign microwave landing radar related data, the high-precision ranging method is mainly obtained by improving the calculation algorithm of the beam center, and it is fundamentally impossible to 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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