Method and apparatus for eliminating multiple-time echoes in pulse Doppler radars
US4214242A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 6, 1978 |
| Grant date | Jul 22, 1980 |
| Priority date | — |
| Expiry date | Dec 6, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S13/225
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.