Procedure for the elimination of interference in a radar unit of the FMCW type
AssigneeCelsiustech Electronics AB
InventorBert-Eric Tullsson
Life of this patent
Estimating the term…
Abstract
In a procedure for the elimination of interferences of short duration, such as pulses, in a radar unit of the FMCW type, the transmitted and received signals are combined to form a useable signal. According to the procedure, the contribution to the Fourier Transform of the interferences of short duration are filtered out of the Fourier Transform in the frequency domain by an FIR filter with complex coefficients. The procedure requires no additional signal processing between sampling and applying the Fourier Transform, gives very little widening of strong contrasts in the Fourier Transform and is fast and simple to implement in a signal processor.
Claims6
A procedure for eliminating an interference of short duration in a FMCW radar unit with a linear frequency sweep, comprising:
- combining a transmitted signal and a received signal to form a difference signal constituting a beat signal that contains the differences between the transmitted and received signals, wherein the beat signal is comprised of a wave for each one of a number of targets that reflects the transmitted signal and each of the waves has a frequency, an amplitude and a phase containing information about the target;
- sampling the beat signal;
- applying a Fourier Transform to the sampled beat signal to obtain a frequency domain representation of the beat signal;
- and
- filtering the frequency domain representation using a FIR filter with complex coefficients to remove a wave contribution to the beat signal caused by the interference.
A procedure for eliminating an interference of short duration in a FMCW radar unit with a linear frequency sweep, comprising:
- combining a transmitted signal and a received signal to form a difference signal;
- sampling the difference signal;
- applying a Fourier Transform to the sampled difference signal to obtain a frequency domain representation of the difference signal;
- and
- filtering the frequency domain representation using a FIR filter with complex coefficients to remove a contribution to the difference signal caused by the interference.
Dependencies are inferred from the claim text.