Patent ID: 7856329

Claim:
A method of processing data acquired by under-sampling a chirped, sinusoidal waveform comprising: complex-heterodyning the under-sampled data using a processor with a chirped signal having characteristics similar to said sinusoidal waveform to generate a demodulated signal; and analyzing the demodulated signal using the processor to determine characteristics of the sinusoidal waveform, wherein said chirped sinusoidal waveform is an interference signal S(t) of the form: S ⁡ ( t ) = A ⁢ ⁢ cos ⁡ ( ω 0 ⁢ t + 1 2 ⁢ α ⁢ ⁢ t 2 ) where: ω 0 is the initial frequency of the interference signal; and α is the chirp of the interference signal, wherein during said analyzing the initial frequency and chirp of the sinusoidal waveform are determined.