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Clutter suppression method based on bistatic multiple-input and multiple-output radar

A clutter suppression, multi-input technology, applied in the field of signal processing, can solve problems such as performance deterioration and failure, and achieve the effects of accurate estimation, accurate clutter characteristics, and elimination of distance dependence.

Inactive Publication Date: 2012-06-27
XIDIAN UNIV
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Problems solved by technology

The disadvantage of this method is that only for the situation where the transmitter is moving and the receiver is stationary, only by projecting the three-dimensional clutter spectrum along the coordinate axis of the receiving cone angle to eliminate the distance dependence of the clutter, when both the radar transmitter and the receiver are moving , using this method to eliminate clutter distance-dependent performance degradation or even failure

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  • Clutter suppression method based on bistatic multiple-input and multiple-output radar
  • Clutter suppression method based on bistatic multiple-input and multiple-output radar
  • Clutter suppression method based on bistatic multiple-input and multiple-output radar

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Embodiment Construction

[0048] Attached below figure 1 The steps of the present invention are further described in detail.

[0049] Step 1: Separate the echo signal

[0050] In the example of the present invention, the mode of the bistatic radar is that the transmitting array element is installed on the transmitter, and the receiving array element is installed on the receiver, and both of them are front side view. The number of transmitting array elements is 11, the number of receiving array elements is 11, and both the transmitting array and the receiving array are equidistant linear arrays. In one coherent processing time, each receiving element receives 10 pulse echo data.

[0051] The sampler connected after each receiving array element of the radar performs analog-to-digital conversion and sampling on the pulse echo signal received by each receiving array element, and obtains the range gate sampling data Y of all pulse echo signals of each receiving array element 1 ∈ C 24200×1 . The number ...

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Abstract

The invention discloses a clutter suppression method based on a bistatic multiple-input and multiple-output radar, which comprises the steps of: (1) separating echo signals; (2) rotating; (3) projecting; (4) estimating a clutter covariance inverse matrix; (5) detecting a weighted vector; and (6) detecting a moving target. The clutter suppression method based on the bistatic multiple-input and multiple-output radar can be suitable for conditions that a transmitter and a receiver of a bistatic radar move, and can eliminate the distance dependence of the bistatic radar. The clutter suppression method based on the bistatic multiple-input and multiple-output radar overcomes the defect of insufficient independent identical distribution training samples for space-time adaptive processing by adopting a rotary projection method for separated coordinates of all echo data, and has the advantages of sufficient independent identical distribution training samples, and capabilities of accurately evaluating clutter characteristics and forming a deep clutter notch in an actual main clutter area through space-time adaptive filtering as well as effectively suppressing clutters.

Description

technical field [0001] The invention belongs to the field of signal processing, and further relates to a clutter suppression method based on a bistatic multiple-input multiple-output radar in the technical field of airborne radar. This method can be used to eliminate the distance dependence of ground clutter in bistatic airborne radar and realize the detection of ground targets. Background technique [0002] The bistatic airborne radar is realized by adopting the separation structure of receiver and transmitter system. The main feature of this structure is that since the transmitter is placed at the rear and the receiver is placed on the UAV, it can approach the target for covert detection. Since the power loss caused by the two-way propagation of radar electromagnetic waves is avoided, the signal-to-noise ratio of the target is improved. Bistatic airborne radar is also useful for detecting stealthy targets. For bistatic airborne radar, ground clutter in different azimuth...

Claims

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Application Information

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IPC IPC(8): G01S7/36G01S7/41
Inventor 李军李焕廖桂生
Owner XIDIAN UNIV
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