GEO SAR satellite imaging method based on single reflector antenna

A single reflection, antenna technology, applied in the direction of reflection/re-radiation of radio waves, utilization of re-radiation, radio wave measurement systems, etc., can solve the problem of high weight of active phased array antennas

Pending Publication Date: 2021-02-05
BEIJING INST OF SPACECRAFT SYST ENG
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Problems solved by technology

GEO SAR has a very large antenna area due to its height, and the use of existing technologies will make the active pha

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  • GEO SAR satellite imaging method based on single reflector antenna
  • GEO SAR satellite imaging method based on single reflector antenna
  • GEO SAR satellite imaging method based on single reflector antenna

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Embodiment Construction

[0029] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0030] The invention provides a GEO SAR satellite imaging method based on a single reflector antenna, the process of which is as follows figure 1 As shown, it specifically includes the following steps:

[0031] S1. Select the antenna aperture according to the minimum unambiguous area and resolution requirements of the antenna, and select the antenna focal length according to the antenna aperture.

[0032] The antenna area selection is mainly restricted by factors such as the minimum unambiguous area and resolution of the antenna.

[0033] The first is the requirement for the minimum unambiguous area of ​​the antenna. The constraint on the pitch dimension of the antenna is The requirements for the azimuth dimension of the antenna are According to the constraints of the antenna azimuth and distance to the aperture length, the minimum area of ​​the ante...

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Abstract

The invention discloses a GEO SAR satellite imaging method based on a single-reflector antenna, belongs to the field of overall design of high-orbit microwave imaging satellites, and aims to perform beam design on GEO SAR of a phased array feed source single-reflector antenna without attitude adjustment and cover all incident angle ranges only through distance-direction electric scanning. In orderto achieve the purpose, the technical scheme of the invention comprises the following steps: S1, selecting an antenna aperture according to the requirements of the minimum unambiguous area and resolution of the antenna, and selecting an antenna focal length according to the antenna aperture; s2, according to an incident angle requirement, calculating a lower visual angle range to obtain a scanning range required to be reached by the antenna, wherein the corresponding relation between the SAR downward viewing angle and the incident angle is shown in the specification, theta is the incident angle, alpha is the downward viewing angle, H is the orbit height and Re earth radius; and S3, setting an antenna feed source to form a scanning range required to be reached by the antenna, and performing satellite imaging.

Description

technical field [0001] The present invention proposes a geosynchronous orbit synthetic aperture radar (GeoSynthetic Aperture Radar, referred to as GEO SAR) satellite imaging method based on a single reflector antenna, which belongs to the field of overall design of high-orbit microwave imaging satellites, and in particular relates to an imaging method based on a range scanning capability. Beam design method for GEO SAR satellite with single reflector antenna. Background technique [0002] In 1978, K. Tomiyasu cooperated with the National Aeronautics and Space Administration (NASA) (Project No. NAS-2-9580), first proposed the concept of GEO SAR, and carried out initial parameter analysis on GEO SAR . [0003] Compared with Low Earth Orbit Synthetic Aperture Radar (LEO SAR for short), the biggest advantage of GEO SAR is its large imaging range and short revisit time: for example, the revisit time of GEO SAR is up to one day, while The revisit time of LEO SAR is generally 3 t...

Claims

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Application Information

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IPC IPC(8): G01S13/90
CPCG01S13/9005
Inventor 张庆君张洪太倪崇赵秉吉吕争朱宇刘波杨思全刘杰刘立平
Owner BEIJING INST OF SPACECRAFT SYST ENG
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