Method for the simultaneous determination of the distance and the speed of a target in a radar system

A method for simultaneously determining the distance and speed of a target in a radar system operating according to the high pulse repetition frequency method, comprising:

• if a target is reported, determining the group delay of a target spectrum in the Doppler domain;
• and
• determining the distance of the target from the group delay;
• wherein:
• a transmitted signal is employed which contains pulses that include an alternating voltage signal component at a transmitting frequency;
• a predetermined number of pulses are combined into a burst;
• bursts are transmitted at a burst repetition duration;
• a demodulated signal is sampled precisely once within a pulse repetition duration so that a sampled signal results;
• the sampled signal is processed with a fast Fourier transformation operation;
• the Fourier transform is formed in each case from a reflected burst and thus from a burst that is shifted in time relative to the transmitted signal;
• a phase curve of the Fourier transform is determined at a frequency point equal to a Doppler frequency;
• the phase curve is differentiated according to the frequency and the group delay at the frequency point;
• and
• the distance of the target is determined from the group delay.