| 摘要 |
A method for the detection of M<SUB>0 </SUB>sources common to several observations <U STYLE="SINGLE">u(t) and <U STYLE="SINGLE">v(t) within a single array of sensors, the observations having different lengths N<SUB>1 </SUB>and N<SUB>2</SUB>, comprises at least the following steps: defining a law of likelihood V<SUB>uv</SUB>([M=M<SUB>0</SUB>]/M<SUB>0</SUB>) substantially equal to the chi-2 law with 2(N<SUB>1</SUB>-M<SUB>0</SUB>)(N<SUB>2</SUB>-M<SUB>0</SUB>) degrees of freedom with N<SUB>1</SUB><=N<SUB>2</SUB>, dim{<U STYLE="SINGLE">u(t)}=N<SUB>1</SUB>x1 and dim{<U STYLE="SINGLE">v(t)}=N<SUB>2</SUB>x1; determining a detection threshold alpha<SUB>M </SUB>in order to obtain a low probability of false alarms and a number of degrees of freedom that takes account of the lengths N<SUB>1 </SUB>and N<SUB>2 </SUB>and of the number of sources M<SUB>0</SUB>; determining the presence and/or the number of the sources M<SUB>0 </SUB>in applying the law of likelihood and the threshold alpha<SUB>M</SUB>. The method and device can be applied to the determining of the presence and/or the number of sources common to at least two observations having different lengths in a GSM type radiocommunications system.
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