Real-time processing method for cancellation of direct wave and clutter of external radiation source radar based on graphic processing unit (GPU)

Abstract

The invention provides a real-time processing method for cancellation of direct wave and clutter of an external radiation source radar on a graphic processing unit (GPU), a high-efficiency parallel processing process is built, and the real-time processing capacity of an algorithm is improved. The method comprises the steps: (1), conducting parallel processing on signal in a section mode, and sectioning a signal to be processed in T seconds; (2) adopting a BLMS method to conduct cancellation processing on the signal of each section, wherein the signal of each section is parallel processed through the step (1); (3) adopting the GPU to conduct parallel processing on the signal, processed through the step (1), of each section, conducting processing on data in each section through a fast Fourier transform (FFT) algorithm in a multithreading mode, removing an overlapping region on an output result, conducting splicing, at the same time, outputting a filter coefficient of a last block of data, and serving the filter coefficient as an initial weight coefficient of subsequent data processing; and (4) serving an iterative finally-obtained filter coefficient w (n) as an initial filter weight value of data in a next second, namely, iterating the data of a first section for K times, and processing the subsequent data only once.

Description

technical field [0001] The invention relates to a GPU-based real-time processing method for external radiation source radar direct wave clutter cancellation, relates to the field of external radiation source radar (PBR) signal processing, and specifically relates to clutter suppression and its real-time signal processing. Background technique [0002] In the field of external radiation source radar signal processing, since the radiation source is not specially designed according to the processing requirements of the radar, there are strong direct waves and clutter in the radar echo signal. Since the received signal is uncontrollable, and the external radiation sources such as broadcasting and TV look down, the direct wave and clutter are often 60-140dB higher than the signal, and there are still strong side lobes after coherent matching, which will overwhelm the long-distance and low-speed targets, so direct wave and clutter suppression is one of the core technical issues fa...

AI Technical Summary

Problems solved by technology

Still can not meet real-time requirements

[0012] 2) The second solution is realized by using CPU multi-threading. Although the parallel processing is realized through segmentation, when the number of segments is too high, there will be a serious loss of direct wave and clutter suppression capabilities, which will affect the signal quality. Coherent accumulation and detection, so the number of segments is limited, resulting in limited algorithm parallelism

and for 2 18 When the sampling point data is divided into 16 segments, it takes 50ms to cancel the time

However, for the processing of the data volume (9M) mentioned above, it is still difficult to meet the high real-time requirements

[0013] 3) The above two schemes do not consider the method of reducing the number of iterations, reducing the amount of calculations to reduce processing time, and at the same time ensuring the ability of clutter suppression

[0014] In short, the existing technical solutions need to be improved in terms of real-time processing capability, stability and utilization of computing resources, and at the same time, it is necessary to ensure that the loss of clutter suppression capability is small

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