Orbital parameter and constellation configuration design method based on omnibearing angle observation

Abstract

The invention discloses an orbit parameter and constellation configuration design method based on omnibearing angle observation. The method comprises the following steps of obtaining a primary satellite orbit height range and a primary orbit inclination angle range according to a daily regression orbit constraint, a satellite downward view angle coverage constraint and a hotspot area center latitude; in the primarily selected satellite orbit height range, obtaining a finely selected satellite orbit height range and a finely selected orbit inclination angle range according to the daily regression orbit constraint, the sub-satellite point orbit intersection point, the central latitude of the hot spot area and the primarily selected orbit inclination angle range; based on the minimum cost function, obtaining an optimal satellite orbit height range and an optimal orbit inclination angle range according to the selected satellite orbit height range and the selected orbit inclination angle range; and obtaining an orbital ascending node right ascension data set and a latitude and argument data set according to the central longitude of the hot spot area, the optimal satellite orbit height range and the optimal orbit inclination angle range. The method is advantaged in that omnibearing angle observation of the satellite-borne SAR satellite with coverage and revisit capability on a hot spot area within the minimum omnibearing angle observation duration is realized.

Description

technical field [0001] The invention belongs to the technical field of radar, and in particular relates to an orbit parameter and constellation configuration design method based on omnidirectional observation. Background technique [0002] Spaceborne Synthetic Aperture Radar (SAR, Synthetic Aperture Radar) has the ability to work all-weather and all-weather, cover a large area and continuously monitor hot spots, and is an effective means of space-to-earth observation. With the continuous advancement of spaceborne SAR technology, its data collection, imaging methods and observation modes are also more flexible and diverse. The spaceborne SAR multi-azimuth observation mode is a new observation mode proposed in recent years. This observation mode obtains multi-view geometric information and scattering information of ground objects in the area through repeated observations of the same area at different azimuth angles. It makes up for the serious lack of information and poor ima...

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Problems solved by technology

[0003] The existing patent "A Method for Designing Earth-orbit Satellite Orbits for Quickly Revisiting Discrete Objects" discloses a design method for optical remote sensing satellites to revisit orbits for the same ground object within a short period of time. Some high-latitude areas have dense intersections, that is, the areas where these intersections are located can be revisited by satellites many times in a day. This high-density revisitation of the same area in a short period of time has a significant effect on shortening the minimum azimuth angle observation time. , but its sub-satellite point target cannot be monitored, but it has a good reference value for the design of single-satellite multi-pass omnidirectional observation orbit parameters

[0004] For the multi-azimuth observation mode, although controlling the multi-azimuth observation beam pointing of the spaceborne SAR co-orbit satellite can ensure the continuous observation of the same target at a large azimuth angle by the spaceborne SAR satellite, it is limited by the positional relationship between the satellite and the target. , resulting in a limited span of observation azimuths

In response to this problem, the multi-azimuth observation of spaceborne SAR satellites further expands the observation azimuth span through multiple transits of the satellite. In addition, the observation is mainly aimed at the detection of hotspot areas, so there are problems in the design of the orbit, such as the limited azimuth span of satellite single-pass observation, and weak coverage and revisiting capabilities of hotspot areas

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