Celsiustech Electronics Ab

Saab Ab

Bert-Eric Tullsson

Lars H Eriksson

A method for reducing angular blur in radar pictures achieved in range bin based detection systems includes measuring a variable S(x, y) such as amplitude or power as a function of an angle x and a distance y. An expression:corrected angular position=angular position+angle correctionis determined in each range bin for a plurality of angular values x. The term 'angle correction' includes derivative(s) of first or higher order of the variable S(x). The variable measured at the angular position 'angular position' is moved to the variable in the angular position &#x201c;corrected angular position&#x201d;, and the moved variable and the variable in &#x201c;corrected angular position&#x201d; are processed by adding or maximizing the values.

Method for reducing angular blur in radar pictures

This invention concerns a procedure for the elimination of interferences, such as pulses and linear chirps, in a radar unit of the FMCW type. According to the procedure, the useable signal in the form of a beat signal, is subjected to time-frequency division of the type STFT for division of the signal into narrow-band frequency bands. Interference is detected and eliminated in each frequency band, after which the time signal freed from interference and its Discrete Fourier Transform, DFT, are calculated from the time-frequency division in narrow-band frequency bands.

Procedure for the elimination of interference in a radar unit of the FMCW type

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.

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Järfalla, Sweden

Bert-Eric Tullsson