Method and system for determining first-order peak signal-to-noise ratio threshold value of high-frequency ground wave radar

Abstract

The embodiment of the invention discloses a method for determining a first-order peak signal-to-noise ratio threshold value of a high-frequency ground wave radar, and the method comprises the steps: generating a signal-to-noise ratio threshold value lookup table which takes time and distance elements as indexes according to radar echo signal energy and noise energy data of historical radar sampling data, wherein the signal-to-noise ratio threshold lookup table taking the moments and the distance elements as indexes comprises a plurality of moments, and each moment comprises a signal-to-noise ratio threshold corresponding to each distance element; and according to the actual working time and the actual distance element of the radar, extracting a signal-to-noise ratio threshold value corresponding to the actual working time and the actual distance element from a signal-to-noise ratio threshold value lookup table taking the time and the distance element as indexes. The embodiment of the invention further discloses a system for determining the first-order peak signal-to-noise ratio threshold value of the high-frequency ground wave radar. According to the method, sea area environment detection factors are included in the signal-to-noise ratio threshold value, the obtained signal-to-noise ratio threshold value better conforms to the actual change rule of signals and noise, the correlation between the signal-to-noise ratio threshold value and the grid units is enhanced, and the accuracy degree of first-order peak judgment is improved.

Description

technical field [0001] The present invention relates to the field of radar technology, in particular to a method and system for determining a first-order peak signal-to-noise ratio threshold of high-frequency ground wave radar. Background technique [0002] At present, the determination methods of the first-order peak signal-to-noise ratio threshold of high-frequency ground wave radar mainly include: the fixed value of the whole range range, the fixed value of the divided distance range step, and the stepwise and linear combination of the divided range range. These determination methods are all based on linear calculation. The signal-to-noise ratio threshold. However, the energy attenuation curve of high-frequency electromagnetic waves propagating along the surface is similar to a high-order exponential curve, so that the SNR threshold obtained by the above method through linear calculation is not applicable, and cannot reasonably correspond to the change of SNR in the frequ...

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Problems solved by technology

However, the energy attenuation curve of high-frequency electromagnetic waves propagating along the surface is similar to a high-order exponential curve, so that the SNR threshold obtained by the above method through linear calculation is not applicable, and cannot reasonably correspond to the change of SNR in the frequency band.

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