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Fmcw radar with frequency hopping

A radar signal and frequency modulation technology, applied in the field of radar sensors, can solve the problem of damaging the operation of the second radar sensor

Pending Publication Date: 2021-06-22
INFINEON TECH AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, a radar signal radiated by a first radar sensor (installed in one car) may spread to the receiving antenna of a second radar sensor (installed in another car) and impair the operation of the second radar sensor

Method used

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  • Fmcw radar with frequency hopping
  • Fmcw radar with frequency hopping
  • Fmcw radar with frequency hopping

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0059] Example 1: A method comprising: receiving an RF radar signal (see Figure 8 , signal y RF (t)); using a frequency-modulated local oscillator signal (see Figure 8 , signal s LO (t)) downconverts the received RF radar signal into baseband, and the frequency-modulated local oscillator signal consists of a wider than conventional chirp bandwidth (see Figure 9 , bandwidth BW) high bandwidth (see Figure 9 , the maximum bandwidth BW MAX ) scanning chirp; based on the downconverted RF radar signal, a digital baseband signal is generated (see Figure 8 , y[n]), the digital baseband signal includes a sequence of samples associated with the scanning chirp; in the sequence of samples the corrupted samples affected by the interference are identified (see Figure 10 ); and based on the location of the corrupted sample within the sampled sequence, select a subband with a conventional chirp bandwidth to transmit the chirp of the frame used to measure the chirp of the data acqui...

example 2

[0060] Example 2: The method of example 1, wherein identifying affected samples includes examining the sequence of samples sample by sample to identify samples representing RF radar signal power above a threshold as compromised samples.

example 3

[0061] Example 3: The method according to example 1 or example 2, wherein the locations of the damaged samples correspond to frequency values ​​within the radar bandwidth, and wherein the subbands are selected such that the subbands include no or as little as possible corresponding frequency value.

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Abstract

Embodiments of the invention relate to an FMCW radar with frequency hopping. A method for the use in a radar system comprises: receiving an RF radar signal; down-converting the received RF radar signal into a base band using a frequency-modulated local oscillator signal including a scanning chirp having a higher bandwidth than a regular chirp bandwidth; generating a digital base band signal based on the down-converted RF radar signal, the digital base band signal including a sequence of samples associated with the scanning chirp; identifying, in the sequence of samples, impaired samples, which are affected by interference; and selecting-based on the position of the impaired samples within the sequence of samples-a sub-band, which has the regular chirp bandwidth, for transmitting chirps of chirp frame used for measurement data acquisition.

Description

technical field [0001] The present disclosure relates to the field of radar sensors, and more particularly to radar sensing techniques that allow improved object detection in the presence of interference. Background technique [0002] Radar sensors can be found in a variety of sensing applications where the distance and velocity of objects are measured. In the automotive sector, there is a growing demand for radar sensors that can be used in so-called advanced driver assistance systems (ADAS). Examples of advanced driver assistance systems are "adaptive cruise control" (ACC) and "radar cruise control" systems. Such a system can be used to automatically adjust the speed of a car in order to maintain a safe distance from other cars driving ahead. Other examples of advanced driver assistance systems are blind spot monitors, which may employ radar sensors to detect other vehicles in the vehicle's blind spots. In particular, autonomous vehicles may use multiple sensors, such a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/28G01S13/931
CPCG01S7/28G01S13/931G01S13/343G01S13/347G01S7/354G01S13/56G01S13/536G01S7/023
Inventor A·罗杰M·比希尔M·埃施鲍默F·B·哈立德P·梅斯纳
Owner INFINEON TECH AG
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