Patent ID: 6686871
Filing Date: 2004-02-03
Classification: G01S

Abstract:
A method for HPRF-radar measurement of range and Doppler frequency for at least one target, said method comprising:generating a transmit signal which includes first and second pulse sequences that are interleaved on a pulse to pulse basis, and have the same pulse repetition frequency PRF and the same transmit frequency, wherein pulses of the first pulse sequence have a linearly increasing phase value, with a fixed phase difference &phgr;1n from pulse to pulse, with &phgr;1n&gE;0; pulses of the second pulse sequence have a linear increasing phase value with a fixed phase difference &phgr;2n from pulse to pulse, with &phgr;1nâ‰ &phgr;2n and &phgr;1n&gE;0; Fourier transforming received base band signals of each individual pulse sequence; determining amplitude peaks of resulting two Fourier spectra; clustering the amplitude peaks of the two Fourier spectra to determine pairs of spectral lines of a Doppler frequency shift of Î”&it;â€ƒ&it;f=&varphi;2&it;n-&varphi;1&it;n2&it;Ï€&CenterDot;PRF;calculating target Doppler frequency based on the two Doppler frequencies of a previously determined spectral line pair; and calculating target range based on a phase difference between spectral lines of a previously determined spectral line pair.