Transmitter identification and validation system and method

A transmitter identification and validation system, comprising:

• (a) means for receiving a signal transmitted by a subject transmitter and producing first and second output signals corresponding to the received signal;
• (b) means for evaluating the first and second output signals and extracting and producing respectively therefrom an observed identification (ID) code corresponding to the subject transmitter of the received signal and a plurality of observed parameter values corresponding to a plurality of parameters of the received signal;
• (c) means for storing sets of ID codes and parameter values corresponding to valid transmitters;
• (d) means for comparing the observed ID code and the plurality of observed parameter values of the received signal from the subject transmitter with said stored sets of ID codes and of parameter value and for generating, in response to the comparing, a pair of scores respectively proportional to the degree of match of the observed ID code with one of the stored ID codes and to the degree of match of the observed parameter value with one of the stored parameter values;
• and
• (e) means for evaluating the respective scores generated by said comparing means and for deciding, first, based on one of the scores whether or not the subject transmitter of the received signal is recognized as matching one of the valid transmitters and, second, based on the other of the scores the likelihood that the subject transmitter of the received signal is legitimate.

A transmitter identification and validation method, comprising the steps of:

• (a) receiving a signal transmitted by a subject transmitter and producing first and second output signals corresponding to the received signal;
• (b) evaluating the first and second output signals and extracting and producing respectively therefrom an observed identification (ID) code corresponding to the subject transmitter of the received signal and an observed parameter value corresponding to a parameter of the received signal;
• (c) storing in a memory sets of ID codes and parameter values corresponding to valid transmitters;
• (d) receiving the observed ID code and the observed parameter value and, in response thereto, recalling a stored ID code and a store parameter value corresponding thereto;
• (e) comparing the observed ID code and the observed parameter value of the received signal from the subject transmitter respectively with the recalled ID code and the recalled parameter value;
• (f) generating, in response to the comparing, a pair of scores respectively proportional to the degree of match of the observed ID code with one of store ID codes and to the degree of match of the observed parameter value with one of the stored parameter values;
• and
• (g) evaluating the respective scores and deciding, first, based on one of the scores whether or not the subject transmitter of the received signal is recognized as matching one of the valid transmitters and, second, based on the other of the scores the likelihood that the subject transmitter of the received signal is legitimate.