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本文的主要目的是精确计算由视频脉冲采样所引起的损失,以便在灵敏度和A/D变换器速度之间折衷。考虑了单门限检测(相关积累之后)和双门限二进制积累(滑窗)两种倩况,前一种情况中又分折了固定目标和起伏目标。结果发现在固定目标、高发现概率(0.9～0.95)和单门限检测时出现最大采样损失。当采样周期等于脉冲宽度T时,损失在2.5～3分贝之间。随着减少采样时间间隔,损失迅速下降。当对每个脉冲取两个采样点时,失损非常接近于0.5分贝。本文主要应用于雷达领域。
The main goal of this paper is to accurately calculate the loss caused by video pulse sampling in order to trade off the sensitivity and A / D converter speed. Consider the two thresholds of single threshold detection (after correlation accumulation) and double threshold binary accumulation (sliding window). In the former case, fixed targets and fluctuating targets are also divided. The results showed that in the fixed target, high probability of detection (0.9 ~ 0.95) and single-threshold detection maximum sampling loss. When the sampling period is equal to the pulse width T, the loss is between 2.5 and 3 dB. As the sampling interval decreases, the loss rapidly decreases. When two samples are taken for each pulse, the loss is very close to 0.5 dB. This article is mainly used in radar field.