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Steady space-time adaptive processing-based target detection method

A space-time adaptive and target detection technology, applied to the echo signal processing of airborne radar, based on the field of robust space-time adaptive processing of target detection, can solve the problem of large amount of calculation, the impact of the load on the performance of the angular load, and the inability to give Issues such as analytical solutions

Inactive Publication Date: 2015-10-21
XIDIAN UNIV
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Problems solved by technology

However, in actual situations, the loading amount is often set according to empirical values, and the uncertainty of the loading amount seriously affects the performance of diagonal loading.
[0005] The second method is the optimal robust method based on the worst performance. This method constrains the target DOA and Doppler frequency within an error cone, and solves the optimal filter weights through a convex optimization method. However, this method cannot gives an analytical solution, and is computationally expensive

Method used

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  • Steady space-time adaptive processing-based target detection method
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  • Steady space-time adaptive processing-based target detection method

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Embodiment 1

[0085] refer to figure 1 , which shows a flow chart of a target detection method based on robust space-time adaptive processing according to an embodiment of the present invention. This embodiment may specifically include the following steps:

[0086] Step 1. Use the airborne radar to transmit signals and receive corresponding echo data.

[0087] Step 1 described in this embodiment may specifically include the following sub-steps:

[0088] 1a) The airborne radar adopts an N-element equidistant linear array, the array element interval is d, and the number of pulses in a coherent sampling interval is K to transmit signals; it should be noted that the N, d, and K are all natural numbers.

[0089] 1b) Receiving corresponding echo data X, wherein the echo data X includes target echo data, clutter echo data, interference echo data, and noise echo data.

[0090] It should be noted that the present invention uses the echo data as the sample to be tested, and the echo data in the pre...

Embodiment 2

[0165] Attached below figure 2 An object detection method based on robust space-time adaptive processing is described.

[0166] refer to figure 2 , which shows a flow chart of a target detection method based on robust space-time adaptive processing according to an embodiment of the present invention. This embodiment may specifically include the following steps:

[0167] Step 201, the radar transmits and receives an echo signal X.

[0168] It should be noted that step 201 corresponds to step 1 in the first embodiment, and reference may be made to the related description of step 1 in the first embodiment, and details are not described here in this embodiment.

[0169] Step 202, performing time-domain sliding window processing on the echo signal to obtain X 1D .

[0170] It should be noted that X 1D It is the echo data after the sliding window, and step 202 corresponds to step 2 in the first embodiment, and reference may be made to the related description of step 2 in the ...

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Abstract

The invention provides a steady space-time adaptive processing-based target detection method, and can improve the degree of accuracy and efficiency of target detection. The method includes: Step 1. an airborne radar receives echo data; Step 2. time domain sliding window processing is performed on the echo data; Step 3. a target apparent guiding vector error boundary matrix is built; Step 4. an autocorrelation matrix of a projection component of echo data in an orthogonal complementary space of a subspace of a target span is calculated; Step 5. a correlation matrix after diagonal loading of the autocorrelation matrix is calculated; Step 6. A weight vector is solved; Step 7. Whether a modulus value of a column vector obtained by multiplying a conjugate transpose matrix of the boundary matrix by the weight vector is smaller than 1 is judged, if yes, after a loading factor is added, Step 5 to Step 6 are executed, and otherwise the weight vector is used as the optimal weight vector; and Step 8. a filter with an optimal weight vector structure is used to filter the echo data after sliding window processing, thereby obtaining target echo data.

Description

technical field [0001] The invention relates to the technical field of space-time adaptive processing, in particular to a target detection method based on robust space-time adaptive processing, and the invention is applied to the echo signal processing of airborne radar. Background technique [0002] The space-time coupling spectrum characteristic of ground and object echoes of airborne radar determines that the clutter suppression effect of space-time adaptive processing (Space-Time Adaptive Processing, STAP) is better than that of one-dimensional clutter suppression technology. The traditional STAP method uses the training data to estimate the space-time correlation matrix of the test data. In a homogeneous environment, the statistical properties of the two sets of data are basically similar. This type of method effectively utilizes the statistical characteristics of the echo and can obtain better clutter suppression performance; however, the actual working environment of...

Claims

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Application Information

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IPC IPC(8): G01S7/41
CPCG01S7/41
Inventor 周宇林春辉陈展野张林让张娟
Owner XIDIAN UNIV
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