US 2022/0091250 A1 · METHOD OF OPERATING RADAR SENSOR SYSTEMS, CORRESPONDING CIRCUIT, SYSTEM, AND VEHICLE

Abstract

A method of operating a radar sensor system includes: frequency down-converting a reception signal that is chirp-modulated with a sequence of chirp ramps to an intermediate frequency signal; and high-pass filtering the intermediate frequency signal to produce a high-pass filtered signal. High-pass filtering includes: first high-pass filtering, with a first corner frequency, the intermediate frequency signal at each chirp in the chirp modulation of the reception signal; and replacing the first high-pass filtering with a second high-pass filtering with a second corner frequency, the first corner frequency being higher than the second corner frequency.

Claims20

Dependent claims

A method of operating a radar sensor system, the method comprising:

frequency down-converting, at a mixer, a received signal reflected from a target to an intermediate frequency signal, the received signal comprising a sequence of chirp ramps;
and
at each chirp ramp, high-pass filtering the intermediate frequency signal, with a first corner frequency during a first time segment of the chirp ramp, and with a second corner frequency during a second time segment of the chirp ramp, the first corner frequency being higher than the second corner frequency.

A radar sensor system, comprising:

a circuit comprising:
an input node configured to receive a reception signal that is chirp-modulated with a sequence of chirp ramps and to frequency down-convert the reception signal to an intermediate frequency signal;
and
a high-pass filter circuit configured to receive the intermediate frequency signal and produce a high-pass filtered signal, the high-pass filter circuit configured to filter the intermediate frequency signal during a first time segment of a chirp ramp with a first corner frequency and filter the intermediate frequency signal during a second time segment of the chirp ramp with a second corner frequency, the first corner frequency being higher than the second corner frequency a transmitter antenna configured to transmit a transmission signal to produce the reception signal as a result of a reflection of the transmission signal at a detection target;
and
a receiver antenna configured to receive the reception signal, the receiver antenna being coupled to the input node of the circuit to transfer the reception signal to the circuit.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application

17/543,175Filed 6 Dec 2021

Priority

IT 10201800000264913 Feb 2018

Published

24 Mar 2022

Term ends

Not estimatedThe source records don’t support an estimate.

Classification11 codes

G01S 13/53
Based upon the phase or frequency shift resulting from movement of objects, with reference to the transmitted signals, e.g. coherent MTi:…
G01S 7/03
Of systems according to group G01S13/00: details of HF subsystems specially adapted therefor, e.g. common to transmitter and receiver
G01S 7/282
Details of pulse systems: transmitters
G01S 7/285
Details of pulse systems: receivers

Method of operating radar sensor systems, corresponding circuit, system, and vehicle

Life of this patent

Method of operating radar sensor systems, corresponding circuit, system, and vehicle

Life of this patent

Abstract

Claims20