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Short-range cluster cancellation method for airborne non-side-looking array radar

A non-side-view array and short-range clutter technology, which is applied in the electronic field, can solve problems such as large system degrees of freedom, increased number of independent and identically distributed samples, and large system calculations.

Inactive Publication Date: 2013-06-26
XIDIAN UNIV
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Problems solved by technology

However, doing so will lead to a huge amount of system calculation and due to the large degree of freedom of the system, the number of independent and identically distributed samples required will also increase, which is often unsatisfactory in practice.

Method used

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  • Short-range cluster cancellation method for airborne non-side-looking array radar
  • Short-range cluster cancellation method for airborne non-side-looking array radar
  • Short-range cluster cancellation method for airborne non-side-looking array radar

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Embodiment Construction

[0052] The technical solutions of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0053] Signal Model of Airborne Non-front-Looking Array Radar

[0054] The general antenna array structure of airborne non-side-view array radar is as follows: figure 1 As shown, the velocity V of the carrier aircraft is parallel to the ground plane, the radar emission wavelength is λ, the angle between the antenna front and the carrier aircraft speed is α, and the pitch angle and azimuth angle of the clutter scattering point relative to the antenna front are respectively for and θ, Ψ are the corresponding space cone angles, satisfying The Doppler frequency of the clutter scattering point is

[0055]

[0056] where f dm is the maximum Doppler frequency, satisfying f dm =2V / λ, formula (1) can be transformed into

[0057]

[0058] where f r is the pulse repetition frequency. For airborne non-sid...

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Abstract

The invention discloses a short-range cluster cancellation method for airborne non-side-looking array radar. The method includes: estimating pitching angle corresponding to a short-range fuzzy distance door, estimating short-range clutters according to prior information of spatial-temporal clutter spectrum, and subjecting the original received data to short-range clutter cancellation. Short-range clutters can be suppressed effectively by the method, and cluster suppression performance better than direct treatment is obtained. Results of simulation experiments proof that the method is effective.

Description

technical field [0001] The invention belongs to the field of electronic technology, and relates to a short-range clutter cancellation method for an airborne non-side-view array radar. Background technique [0002] The clutter power spectrum of airborne non-frontal side-looking array radar varies with distance at short range, and it will expand on the space-time plane, which is usually called clutter with distance dependence. In this case, the clutter covariance matrix obtained by performing maximum likelihood estimation on range clutter samples cannot accurately reflect the statistical information of the range-gated clutter to be detected. As a result, the clutter suppression performance of the space-time adaptive processing (STAP) method is severely degraded. The distance dependence of airborne non-side-view array radar clutter has been studied for many years. Typical methods include Doppler compensation method, angle Doppler compensation method, derivative update method, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/292
Inventor 文珺史林包敏李彩彩朱明哲
Owner XIDIAN UNIV
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