A simulation method of space-based radar clutter

Abstract

The invention provides a space-based radar clutter simulation method. The method considers influence of an earth sphere model and earth rotation, through projection and coordinate transformation, the longitude and latitude of equidistant clutter rings on the earth surface can be obtained, clutter Doppler is obtained through coordinate system transformation, and then the reflection power of a clutter unit is calculated, thereby obtaining clutter echoes of equidistant rings. The method can be applied to simulating echoes of space-based radar equidistant clutter rings of any track, and can calculate the positions of the equidistant clutter rings, thereby laying a foundation for determining the clutter type. The method can also be used for space-based radar clutter two-dimensional spectrum analysis, space-based radar clutter suppression method assessment, analysis of influence of a space-based radar track on system performance and the like.

Description

technical field [0001] The invention provides a space-based radar clutter simulation method, which mainly relates to the field of space-based radar clutter simulation. Background technique [0002] In the research of space-based radar, clutter suppression is one of the most important key technologies, and the modeling and simulation of clutter is the basis of clutter characteristics analysis, and also the means of research and verification of clutter suppression methods. Due to the high orbital altitude of space-based radar, the earth can no longer follow the assumptions of the planar model, and the influence of the earth's rotation cannot be ignored, and additional Doppler frequencies will be introduced, and as the orbital altitude increases, this effect becomes more and more more obvious. Therefore, it is necessary to study the clutter simulation method suitable for space-based radar. [0003] In the signal processing of the radar system, the pulse compression of the ran...

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Problems solved by technology

[0004] So far, according to the literature found in public channels at home and abroad, there are literatures that study the modeling and simulation methods of space-time two-dimensional clutter of space-based radar, give the simulation formula of space-time clutter echo, and discuss the clutter The division of wave units, the calculation of radial velocity and ground position, etc., but the calculation assumes that the satellite orbit is a circular orbit, that is, when the eccentricity is zero, it cannot be extended to an elliptical orbit; some literature has calculated the equidistant ring position, but under the assumption that the scene is flat; some literatures have considered the influence of the earth’s rotation and factors such as range ambiguity and Doppler ambiguity, but they cannot obtain the ground position of the range ring; Ground clutter produces serious Doppler frequency shift due to rotation, as well as the influence of orbital height; some literature gives the calculation method of Doppler frequency on the clutter equidistant ring in the equivalent earth model, but does not give How to calculate the position of the distance ring; there are also literatures that give the equidistance line and equal Doppler line of the low-orbit satellite on the ground, but the calculation is based on the assumption that the satellite is running above the equator, and it is not applicable to the satellite in any orbit. The situation of the location

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