Radar detector having a multi-period peridocity validator and method therefor

A method for detecting the presence of an active radar signal comprising:

• a) establishing an expected period for pulses in a pulse train;
• b) sensing a received pulse having timing parameters;
• c) determining whether said timing parameters of said received pulse match said expected period;
• and
• d) determining whether said timing parameters of said received pulse match an alternate period, said alternate period being different from said expected period.

A radar detector having a multi-period periodicity validator, said radar detector comprising:

• a pulse sensor configured to sense a received pulse;
• a first-period detector coupled to said pulse sensor and configured to detect an expected period;
• a second-period detector coupled to said pulse sensor and configured to detect a first-alternate period;
• a third-period detector coupled to said pulse sensor and configured to detect a second-alternate period, wherein said first-alternate period is one-half of said expected period, and said second-alternate period is twice said expected period;
• and
• a control element coupled to said first-period detector, said second-period detector, and said third-period detector, said control element being configured to determine if a pulse sensed at said pulse sensor exhibited a period matching one of said expected, first-alternate, or second-alternate periods.