Two dimentional attitude control system of synthetic aperture radar satellite

A synthetic aperture radar and attitude control technology, which is applied in the field of radar satellite attitude control system, can solve the problems of increasing algorithm computation and imaging processing difficulty, difficult to improve clutter suppression level, difficult to obtain Doppler spectrum overlap, etc. , which is beneficial to ground slow-moving target detection, image post-processing, and the effect of improving clutter suppression level

Inactive Publication Date: 2009-08-26
BEIHANG UNIV
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Problems solved by technology

[0005] 1. The increase of the range migration makes the response of the point target diffuse in the range direction, and the range-wise matched filter needs to consider the cubic term of the range spectrum, perform secondary distance compression or use a more accurate imaging processing algorithm, which increases the calculation amount of the algorithm and The difficulty of imaging processing reduces the efficiency of data processing;
[0006] 2. The degree of geometric distortion of the image increases, and more complex correction techniques must be adopted to ensure the relative position accuracy and absolute position accuracy of the radar ima

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  • Two dimentional attitude control system of synthetic aperture radar satellite
  • Two dimentional attitude control system of synthetic aperture radar satellite
  • Two dimentional attitude control system of synthetic aperture radar satellite

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Embodiment Construction

[0034] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0035] The present invention is a two-dimensional attitude control system of a synthetic aperture radar satellite, and the two-dimensional attitude control system includes:

[0036] An ephemeris parameter output module, used to convert the received orbital data, and respectively output the first trajectory parameter f={a, e, i, ω}, the second trajectory parameter f={e} and the anomaly M;

[0037] In the present invention, the general satellite orbit data includes: satellite number, confidentiality classification, international identifier, TLE duration, first-order time derivative of average motion, second-order time derivative of average motion, BSTAR resistance coefficient, ephemeris type, Ephemeris number, orbital inclination i, orbital ascending node right ascension, orbital eccentricity e, orbital pericentric argument ω, mean anomaly M, average motion n, ...

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Abstract

The invention discloses a two dimentional attitude control system of a synthetic aperture radar satellite, which includes a satellite position analysis module, a satellite position analysis module and an expected attitude determination module. The two dimentional attitude control system is applied in the situation that the synthetic aperture radar satellite runs on an elliptic orbit, and echoed signal doppler center frequency can be controlled to be zero by applying yaw-pitch-two-dimensional attitude control technology, thus effectively weakening the degree of coupling between distance vector and direction vector and lowering the difficulty and operand of imaging process.

Description

technical field [0001] The invention relates to a control system for radar satellite attitude. More specifically, it refers to a two-dimensional attitude control system for synthetic aperture radar satellites. Background technique [0002] The synthetic aperture radar satellite is installed on a moving platform, transmits and receives pulses according to a certain repetition frequency, and coherently superimposes the target echo signals received within a period of time, so as to obtain the detection effect of the large-aperture antenna array and achieve high azimuth resolution , while using pulse compression technology to achieve high range resolution. [0003] Compared with the real aperture radar satellite, the biggest feature of the synthetic aperture radar satellite is that it uses the relative motion between the radar and the target to generate the Doppler frequency shift effect, forms the azimuth spectrum, and improves the azimuth resolution through matched filtering....

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Application Information

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IPC IPC(8): B64G1/24
Inventor 于泽陈杰周荫清李春升
Owner BEIHANG UNIV
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