Each filter has flexible adjustability of its time window and frequency bandwidth. Therefore, high mode resolution and short observation time window can be self-adaptively achieved.

每个滤波单元时频域带宽柔性可调，能根据测量要求自适应取得较高的模式分辨率和较短的观测时窗长度。

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Oil gathering box side with observation window, the observable oil gathering box sets the amount of oil, when residual oil of oil gathering box is thick, it may at any time release.

集油盒侧面设有观察窗，可光差集油盒内集油量，当集油盒内残油积满可随时放出。

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"Fortunately, the largest patch of open water is in front of the observation window where visitors can see the swans and ducks at feeding time, " a spokesperson for the centre said.

BBC: Welney welcomes wildfowl that fled harsh Arctic weather