Radar measuring device and method with dual radar signal generation

A radar measuring device, comprising:

• a first generator of a first periodic radar signal whose frequency varies linearly, over at least one portion Tramp of a period, in a frequency band;
• a transmit antenna coupled to an output of the first generator and configured to transmit the first radar signal;
• a second generator of a second periodic radar signal (1) whose frequency varies linearly, over said portion Tramp of the period, in the frequency band, (2) which is generated with a constant phase or a same start-up phase as the first radar signal, and (3) has, relative to the first radar signal, a configurable delay Tmix;
• a receive antenna configured to receive at least one echo of the first radar signal;
• and
• a mixer comprising a first input coupled to the receive antenna and a second input coupled to an output of the second generator, wherein:
• the first generator includes a first Cartesian modulator configured to receive, on a first input, a first periodic signal to be frequency modulated, receive, on a second input, a second periodic signal to be frequency and quadrature modulated with the first periodic signal, receive, on a third input, a first control signal comprising a first digital sequence of frequency samples, receive, on a fourth input, a second control signal comprising a second digital sequence of frequency samples, receive, on a fifth input, a clock signal, and perform a modulation of the first and second periodic signals respectively by the first and second control signals at a frequency of the clock signal;
• and
• the second generator includes a second Cartesian modulator configured to receive, on a first input, the first periodic signal to be frequency modulated, receive, on a second input, the second periodic signal to be frequency and quadrature modulated with the first periodic signal, receive, on a third input, a third control signal comprising the first digital sequence of frequency samples delayed by the configurable delay τmix, which is equal to an integer number of periods of the clock signal, receive, on a fourth input, a fourth control signal comprising the second digital sequence of frequency samples delayed by the configurable delay τmix, receive, on a fifth input, the clock signal, and perform a modulation of the first and second periodic signals respectively by the third and fourth control signals at the clock signal frequency.