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Object detection method and apparatus based on self-adaptive frequency domain noncoherent accumulation

A technology of non-coherent accumulation and target detection, which is applied in the field of target detection methods and devices based on adaptive frequency-domain non-coherent accumulation, to achieve stable performance, reduce the number of accumulations, and improve the output signal-to-noise ratio

Active Publication Date: 2015-02-04
CHINA UNIV OF GEOSCIENCES (WUHAN)
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a target detection method and device based on adaptive frequency-domain non-coherent accumulation in view of the shortcomings of the existing frequency-domain non-coherent accumulation method that the number of accumulations is fixed. Adaptively adjust the number of accumulations, reduce the amount of calculation in the accumulation process, and improve real-time detection performance

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  • Object detection method and apparatus based on self-adaptive frequency domain noncoherent accumulation
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  • Object detection method and apparatus based on self-adaptive frequency domain noncoherent accumulation

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Embodiment Construction

[0047] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0048] refer to Figure 1 ~ Figure 2 As shown, the target detection method based on adaptive frequency-domain non-coherent accumulation described in the embodiment of the present invention includes the following steps:

[0049] (1) two threshold values ​​T11=16dB, T12=12dB of setting first level threshold, two threshold values ​​T21=16dB, T22=13dB of setting second level threshold, initialization second level threshold T2= 0;

[0050] (2) Calculate the frequency domain data of the input signal, as follows:

[0051] For an input signal x(n) of N points (N is an integer power of 2) in a frame, N point data X(k) is obtained after FFT transformation:

[0052] X ( k ) = Σ n = 0 N ...

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Abstract

The invention discloses an object detection method and apparatus based on self-adaptive frequency domain noncoherent accumulation. The method comprises: first of all, carrying out FFT and operation on the input signals of a frame of an N point to obtain frequency domain data; then calculating an input signal-to-noise ratio SNR1 before accumulation of the frequency domain data; comparing the SNR1 with a first-stage threshold, determining whether to accumulate the frequency domain data, and obtaining output data; if the SNR1 is greater than the first-stage threshold, not performing the accumulation; if the SNR1 is smaller than the first-stage threshold, determining a second-stage threshold through the SNR1, performing the accumulation by use of an improved frequency domain noncoherent mode, and when an output signal-to-noise ratio reaches the second-stage threshold, stopping the accumulation; then performing autocorrelation operation on output data to obtain object data; and finally, performing peak detection on the object data, and taking a frequency point corresponding to the maximum spectrum value as an object frequency point. According to the invention, the noncoherent accumulation frequency is determined and adjusted through the signal-to-noise ratios before the accumulation and after the accumulation, the relaizaiton is simple, the disadvantage of fixed accumulation frequency by use of a conventional method can be overcome, the computational complexity is effectively reduced, and the real-time detection performance is improved.

Description

technical field [0001] The invention belongs to the field of radar signal processing, in particular to the field of single target detection and processing under the condition of low signal-to-noise ratio and uniform noise background distribution, and in particular to a target detection method and device based on adaptive frequency-domain non-coherent accumulation. Background technique [0002] The accumulation method is a classic method of radar signal detection and processing, which is suitable for the detection of weak signals under low signal-to-noise ratio. Through a period of signal accumulation, under the condition of time permitting, theoretically, periodic signals can continuously improve the signal-to-noise ratio, and quasi-periodic signals can also be processed according to their own characteristics after certain compensation. For time-domain accumulation, the key to signal processing technology lies in the alignment of the time envelope, that is, cycle alignment; ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41
CPCG01S7/2927G01S7/354
Inventor 薛伟童蓬荣霞陈振兴
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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