So, the detection and extraction of signals reflected by the target are difficulties and the key technology of passive tracking location.

因此，目标反射信号的检测和提取是个难点，也是无源探测定位的关键技术之一。

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Increase of detection range and fast precision tracking are main difficulties in weak aerial target detection for High Frequency Surface Wave Radar (HFSWR).

增大探测距离、快速精确跟踪是高频地波雷达探测飞行小目标所面临的主要困难。

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To solve the difficulties in dim target detection, such as low SNR and small-scale displacement, a new automatic target detection algorithm based on lifting scheme and wavelet energy is proposed.

针对图像序列中红外弱小目标的检测与跟踪中遇到的难点，即信噪比低、帧间相对位移小等问题，提出一种基于小波提升框架及小波能量的目标检测算法。

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