Method and apparatus for eliminating multiple-time echoes in pul

Details Method and apparatus for eliminating multiple-time echoes in pul Method and apparatus for eliminating multiple-time echoes in pul

1978-12-06

1980-07-22

Wilbur, Maynard R.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343 171PF, G01S 942

Patent

active

042142423

ABSTRACT:
A method and apparatus for eliminating multiple-time echoes from the output signal train of random PRF pulse Doppler radar system. A multiple-time echo is recognized by calculation of the absolute value of the difference between the last two phase pulses received in each range gate (bin). That absolute value is compared to the average of the preceding N absolute value. A multiple-time echo is present if the last absolute value is higher by a predetermined amount than the average of the preceding N absolute values. A logical switch provides automatic switching to substitute a previous phase pulse in a corresponding range gate when the phase pulse of a range gate is determined to be altered by presence of a multiple-time (non-coherent) echo signal.

REFERENCES:
patent: 3441930 (1969-04-01), D'Obrenan et al.
patent: 4153899 (1979-05-01), Taylor, Jr.

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