...服务器将多普勒频偏信息发送给其它手持GPS接收机，这样手持GPS接收机的搜索空间大大减少，只对很少的几个频率区(Frequency bins)举行搜索，首次定位时间(TTFF)也就可以减小到只有几秒。而传统的GPS接收机要在整个频率规模内举行搜索。
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By focusing operation, array output vectors at different frequency bins are transformed to focusing frequency and individual cumulants matrix is got.
通过聚焦操作，把各个窄带频率处的阵列输出矢量变换到聚焦频率处，然后求其累积量矩阵。
Focus matrix is constructed by polar decomposition of location matrix and transforms signal subspace at different frequency bins to signal subspace at focusing frequency bin.
通过对方向矩阵进行极分解构造聚焦矩阵，把各个窄带频率处的信号子空间变换到聚焦频率处的信号子空间。
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