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Space-based phased-array radar space multi-target orbit determination method

A phased array radar, multi-target technology, applied in the field of signal processing, can solve the problems of poor angle measurement accuracy and low signal-to-noise ratio

Inactive Publication Date: 2012-07-04
XIDIAN UNIV
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Problems solved by technology

[0006] In view of the above problems, the present invention provides a space multi-target orbit determination method based on space-based phased array radar to overcome the near-far effect of space multi-targets and solve the poor angle measurement accuracy of long-distance targets due to low signal-to-noise ratio to improve the accuracy of orbit estimation

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[0039] The working scene graph used in the present invention is as figure 2 As shown, the phased array radar uses the detection star as the platform, and the array is arranged on the Y'O'Z' plane, and its structure is as follows image 3 shown.

[0040] according to image 3 The signal model is established, and the echo data x(t) of each array element at time t is obtained as:

[0041] x(t)=As(t)+n(t), 1)

[0042] in P is the target number, θ k and are the elevation angle and azimuth angle of the kth target respectively, k=1,..., P, is the steering vector of the kth target, N represents the number of array elements, T represents transposition, s(t)=[s 1 (t)s 2 (t)...s P (t)] T is the signal envelope, n(t)=[n 1 (t), n 2 (t),...,n N (t)] T is the noise vector.

[0043] refer to figure 1 , the present invention is based on the above-mentioned signal model, that is, the echo data x(t) of each array element at time t, a proposed space-based phased array radar or...

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Abstract

The invention discloses a space-based phased-array radar space multi-target orbit determination method, which mainly solves the problems that the space weak target cannot be evaluated effectively and the target orbit determination precision is low in the prior art. The method comprises the following steps of: processing target echo data by a zero-setting conformal algorithm, acquiring distance prior information by utilizing a distance pulse compression principle, and segmentally processing echo signals according to the distance prior information; segmenting the echo signals according to the number of the targets, wherein each segment of data is a target signal and an adjacent unit signal; performing multi-target two-dimensional angle evaluation on each segment of data by utilizing a sum-difference multi-beam angle-measuring principle; performing coordinate conversion based on a space target tracking result and detection satellite orbit information; and performing orbit determination on different space targets by a Laplace type iterative algorithm, and improving the orbit determination precision by a least square algorithm. According to the method, the influence of strong signals on weak targets can be reduced and the parameters of the weak targets can be evaluated accurately. The method can be applied in the actual application fields of space situation awareness, orbit resource management and the like.

Description

technical field [0001] The invention relates to the technical field of signal processing, and relates to satellite orbit determination, in particular to a space-based phased array radar-based orbit determination method for targets of different distances and distances in space, which can be used for detection, tracking and orbit determination of multiple space targets. Background technique [0002] Determining the orbit of a space target, the acquired target orbit information can provide data support for the establishment of the orbit database, and can also provide a priori information for the identification of space targets, which is of great significance for space situational awareness, orbit resource management and ensuring the safety of on-orbit aircraft . [0003] The current US space surveillance network (SSN: Space Surveillance Network) is mainly composed of three types of systems: (1) Ground-based radar surveillance systems, mainly including: FPS-85 radar, Pave Paws r...

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Application Information

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IPC IPC(8): G01S13/58
Inventor 曾操谈维林杨志伟廖桂生陶海红李军刘志凌杨绪
Owner XIDIAN UNIV
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