Method of suppressing interferences in systems for detecting objects
US7463181B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 20, 2004 |
| Grant date | Dec 9, 2008 |
| Priority date | — |
| Expiry date | Aug 13, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S2013/9324
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a method for suppressing interferences while detecting objects in a target area, a transmitter transmits a sequence of pulses into the target area, and a receiver detects the resulting reflection signal of the pulses reflected from the objects, within successive time windows that are referenced to the moment of transmitting an individual pulse and thus represent distance gates. The time spacing between the successive individual pulses is variable and randomized according to the pseudo-noise principle within predetermined limits, and the time windows are adapted accordingly. The received reflection signal may be sampled, digitized, digitally pre-processed and digitally filtered in the individual distance gates. A non-linear digital filter, preferably a sliding median filter, is used for the filtering to suppress transient disturbances. The median is determined from an odd number of consecutive sampled values of a reflection signal detected within a distance gate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.