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Parameter estimation method for modelling noise Doppler of airborne radar

An airborne radar and parameter estimation technology, which is applied in the field of clutter Doppler parameter estimation, can solve problems such as affecting the accuracy of parameter estimation, and achieve the effect of breaking through the Rayleigh limit and avoiding transform domain processing.

Inactive Publication Date: 2005-03-30
TSINGHUA UNIV
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Problems solved by technology

However, the spectral resolution of such methods is limited by the Rayleigh limit, i.e., the resolution is larger than the inverse of the coherent processing interval (CPI)
When pulse sampling is limited, this limitation will inevitably affect the accuracy of parameter estimation

Method used

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  • Parameter estimation method for modelling noise Doppler of airborne radar
  • Parameter estimation method for modelling noise Doppler of airborne radar
  • Parameter estimation method for modelling noise Doppler of airborne radar

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Embodiment Construction

[0036] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0037] figure 1 A schematic structural diagram of a conventional airborne radar is shown, which is mainly composed of a transceiver system 1, a signal processing system 2, and a terminal display system. The transceiver system is composed of transmitter, receiver and antenna system. The transmitter modulates a specific form of pulse signal onto a radio frequency carrier and transmits it into space through an antenna system. After the transmitted signal is reflected by the targets and ground objects in the detection area, the backscattered signal is received by the airborne radar antenna system, and the RF signal is mixed by the receiver to obtain an intermediate frequency signal, and the intermediate frequency signal is then subjected to multi-stage mixing After that, it is transformed into a signal suitable for acquisition, and then...

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Abstract

The invention discloses a modeled clutter Doppler parameter estimation method of airborne radar. The clutter model provided by said invention is Doppler distribited clutter (DDC) model. The clutter covariance matrix described by said model is analyzed and expressed by four specific parameters of Doppler centre, Doppler spectrum-width extending coefficient, clutter roughness parameter and noise roughness parameter. The clutter parameter estimation method includes the following steps: (1) airborne radar can be used for transmitting pulse signal, and collecting echo data; 2). utilizing clutter data in collected signals to form itnerference covariance matrix of sample; and 3). according to the itnerference covariance matrix of sample combinatively estimating the unknown parameter in DDC clutter model. Besides, said invention also provides the advantage and application of said estimation method.

Description

technical field [0001] The present invention relates to radar, and more specifically, the present invention relates to a method for estimating clutter Doppler parameters of airborne radar. Background technique [0002] Airborne radar has excellent characteristics such as all-day, all-weather, and penetrating, and has a wide range of applications in civil and military fields such as navigation, surveying and mapping, reconnaissance, warning, and fire control. However, there are many unresolved technical problems in airborne radar signal processing, and many of them can be attributed to the clutter Doppler parameters (such as Doppler center, Doppler spectral width and Doppler Tuning frequency, etc.) estimation problem. [0003] For example, in the moving target detection of airborne radar, the received signal usually includes target signal, clutter signal and noise signal. Since the airborne radar is usually in the downward-looking mode, the ground clutter is widely distribu...

Claims

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Application Information

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IPC IPC(8): G01S7/292G01S13/50
Inventor 许稼彭应宁夏香根王秀坛
Owner TSINGHUA UNIV
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