The likelihood ratio criterion of sphericity test, its asymptotic expansion and limiting distribution are obtained.

论文得到了球形检验的似然比准则，它的渐近展开与极限分布。

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It is proved by theoretical derivation that under the N-P criterion, the system fusion rules and the sensor decision rules are still the likelihood ratio threshold decision rules.

通过理论推导，证明了在N - P准则下，融合系统的融合规则和传感器的判决规则是似然比门限判决。

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