System on basis of SAR (synthetic aperture radar) satellites and application mode

Abstract

The invention provides a system on the basis of SAR (synthetic aperture radar) satellites. Basic configuration units of the system are '2+2' satellites, each satellite is required to have left-right side-view imaging capability, one of every 2 SAR satellites coupled and used with each other has a broad-width scanning imaging function and is used for rough observation, the other SAR satellite can be in high-resolution precise imaging modes and is used for detailed imaging, and inter-satellite communication links are allocated between every two corresponding satellites; the satellites are provided with 1-day regression ground-trajectory repeat low-inclination tracks, sub-satellite point ground trajectories of the four satellites are consistent with one another, the system is in a similar fence building ')' combination observation mode, right ascension and phase angles of ascending nodes are reasonably configured, and accordingly 'square'-shaped regions can be formed by the four satellites in short time for observing the ground. The system has the advantages that SAR load diversity work modes are utilized and are combined with reasonable track designs, and accordingly similar 'fence building' dynamic and defense observation can be carried out on the ranges of concerned regions at the low satellite amount and the low construction cost.

Description

technical field [0001] The invention relates to an aerospace vehicle, in particular to a system and an application mode based on a SAR satellite. Background technique [0002] Synthetic Aperture Radar-SAR (hereinafter referred to as SAR) satellite is a remote sensing satellite system that actively transmits electromagnetic waves to the target and uses the signal transmitted back from the target for imaging or detection. As an active detection system, SAR satellites are not limited by light and climate conditions, and have all-day and all-weather imaging capabilities. [0003] In the use of SAR satellites, high resolution and wide mapping bandwidth are the main goals of earth observation. The high resolution of SAR images has always been the primary concern of users, and there are almost endless demands on this issue; in addition to high resolution, wide mapping bandwidth is also very important. However, spaceborne SAR azimuth resolution and distance mapping bandwidth are t...

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Problems solved by technology

According to this constraint relationship, the higher the resolution, the narrower the imaging width will be, and it is difficult for one satellite to take care of both

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