基于雙采樣速率的動目術(shù)檢測技術(shù)研究
A Study on Moving Target Detection Technique Based on Double Sample Rate
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摘要: 高精度動目標檢測是雷達數(shù)字接收機的一項核心技術(shù),現(xiàn)有的多普勒頻移估計方法不能滿足現(xiàn)代數(shù)字接收機的高精度、低計算量、超低信噪比環(huán)境等要求。該文提出了一種低信噪比環(huán)境下的基于雙采樣速率的高精度動目標檢測技術(shù),它包括基于FFT的欠采樣信號頻率無模糊估計,高精度多普勒頻移估計和基于雙采樣速率的動目標徑向速度估計等算法。
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關(guān)鍵詞:
- 欠采樣; 無模糊頻率估計; 多普勒頻移估計; 雙采樣速率; 動目標檢測
Abstract: High accuracy moving target detection is a key technique in the digital radar receiver. The Doppler frequency estimation methods which have been presented can not satisfy the performances of modern digital receivers such as high estimation accuracy, less computation, super low SNR circumstance, etc. In this paper, a high accuracy detection technique of moving target based on double sample rate in low SNR circumstance is proposed, and it includes three main techniques, i.e. unambiguous frequency estimation of sub-sampling signal based on FFT, high accuracy Doppler frequency estimation and radial rate estimation of moving target based on double sample rate. -
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