Range extension with segmentation

Patent metadata

Field	Value
Publication number	US-11143753-B2
Application number	US-201916407982-A
Country	US
Kind code	B2
Filing date	May 9, 2019
Priority date	May 9, 2019
Publication date	Oct 12, 2021
Grant date	Oct 12, 2021

Abstract

A vehicle, radar system of a vehicle and method of extending a range of the radar system. The radar system includes a transmitter antenna, a receiver antenna and a processor. The transmitter antenna transmits a reference signal. The receiver antenna receives an echo signal in response to reflection of the reference signal from an object located at a distance outside of the range limit of the radar system, wherein the range limit indicating a frequency sampling range. The processor generates a frequency peak for the object from the received echo signal, wherein the frequency peak lies outside of the frequency sampling range, shifts the frequency peak to within the frequency sampling range, and determines a range of the object using the frequency-shifted peak.

First claim

What is claimed is:

1. A method of extending a detection range of a vehicle, comprising:
transmitting a reference signal from a transmitter antenna of a radar system of the vehicle;
receiving an echo signal at a receiver antenna of the radar system in response to reflection of the transmitted reference signal from an object located at a distance outside of a range limit of the radar system, wherein the range limit indicates a frequency sampling range;
generating, at a processor, a frequency peak for the object from the received echo signal, wherein the frequency peak lies outside of the frequency sampling range;
shifting, at the processor, the frequency peak to within the frequency sampling range;
determining, at the processor, a range of the object using the frequency-shifted peak; and
providing the range of the object to the vehicle to operate the vehicle.

2. The method of claim 1 , wherein the reference signal is a linear frequency modulated signal and the range limit is related to a slope of the linear frequency modulated reference signal.

3. The method of claim 1 , further comprising applying a band pass filter to the frequency peak at the processor.

4. The method of claim 3 , further comprising shifting the frequency peak by a selected frequency shift and applying the band pass filter to the frequency-shifted peak.

5. The method of claim 3 , further comprising applying the band pass filter to the frequency peak and shifting the frequency peak to within the frequency sampling range.

6. The method of claim 3 , wherein the band pass filter is one of a plurality of band pass filters that are one of: (i) filters that extend over the frequency sampling range without overlapping each other; and (ii) filters that define one or more non-contiguous frequency ranges with at least one of the filter ranges being outside of the frequency sampling range and that can be frequency-shifted to extend over the entirety of the frequency range without overlapping each other.

7. The method of claim 1 , further comprising adding, at the processor, a time delay to the reference signal to obtain a time-delayed reference signal, and mixing the time-delayed reference signal with the echo signal to shift the frequency of the frequency peak corresponding to the echo signal.

8. A radar system for a vehicle, comprising:
a transmitter antenna configured to transmit a reference signal;
a receiver antenna configured to receive an echo signal in response to reflection of the reference signal from an object located at a distance outside of the range limit of the radar system, wherein the range limit indicates a frequency sampling range; and
a processor configured to:
generate a frequency peak for the object from the received echo signal, wherein the frequency peak lies outside of the frequency sampling range;
shift the frequency peak to within the frequency sampling range; and
determine a range of the object using the frequency-shifted peak.

9. The radar system of claim 8 , wherein the reference signal is a linear frequency modulated signal and the range limit is related to a slope of the linear frequency modulated reference signal.

10. The radar system of claim 8 , wherein the processor is further configured to apply a band pass filter to the frequency peak.

11. The radar system of claim 10 , wherein the processor is further configured to shift the frequency peak by a selected frequency shift and apply the band pass filter to the frequency-shifted peak.

12. The radar system of claim 10 , wherein the processor is further configured to apply the band pass filter to the frequency peak and shift the frequency peak to within the frequency sampling range.

13. The radar system of claim 10 , wherein the band pass filter is one of a plurality of band pass filters that are one of: (i) filters that extend over the frequency sampling range without overlapping each other; and (ii) filters that define one or more non-contiguous frequency ranges with at least one of the filter ranges being outside of the frequency sampling range and that can be frequency-shifted to extend over the entirety of the frequency range without overlapping each other.

14. The radar system of claim 8 , wherein the processor is further configured to add a time delay to the signal to obtain a time-delayed reference signal, and mix the time-delayed reference signal with the echo signal to shift the frequency of the frequency peak corresponding to the echo signal.

15. A vehicle, comprising:
a transmitter antenna configured to transmit a reference signal;
a receiver antenna configured to receive an echo signal in response to reflection of the reference signal from an object located at a distance outside of the range limit of the radar system, wherein the range limit indicates a frequency sampling range; and
a processor configured to:
generate a frequency peak for the object from the received echo signal, wherein the frequency peak lies outside of the frequency sampling range;
shift the frequency peak to within the frequency sampling range; and
determine a range of the object using the frequency-shifted peak.

16. The vehicle of claim 15 , wherein the reference signal is a linear frequency modulated signal and the range limit is related to a slope of the linear frequency modulated reference signal.

17. The vehicle of claim 15 , wherein the processor is further configured to apply a band pass filter to the frequency peak.

18. The vehicle of claim 17 , wherein the processor is further configured to perform one of: (i) shifting the frequency peak by a selected frequency shift, and applying the band pass filter to the frequency-shifted peak; and (ii) applying the band pass filter to the frequency peak, and shifting the frequency peak to within the frequency sampling range.

19. The vehicle of claim 17 , wherein the band pass filter is one of a plurality of band pass filters that are one of: (i) filters that extend over the frequency sampling range without overlapping each other; and (ii) filters that define one or more non-contiguous frequency ranges with at least one of the filter ranges being outside of the frequency sampling range and that can be frequency-shifted to extend over the entirety of the frequency range without overlapping each other.

20. The vehicle of claim 15 , wherein the processor is further configured to add a time delay to the signal to obtain a time-delayed reference signal, and mix the time-delayed reference signal with the echo signal to shift the frequency of the frequency peak corresponding to the echo signal.

Assignees

• Gm Global Tech Operations Llc

Inventors

• Longman Oren
• Villeval Shahar
• Bilik Igal
• Kissos Lior

Classifications

• G01S13/34 Primary

  using transmission of continuous, frequency-modulated waves while heterodyning the received signal, or a signal derived therefrom, with a locally-generated signal related to the contemporaneously transmitted signal · CPC title

• G01S13/343

  using sawtooth modulation · CPC title

• G01S13/931 Primary

  of land vehicles · CPC title

• G01S7/354

  Extracting wanted echo-signals (Doppler systems G01S13/50) · CPC title

• G01S13/526

  performing filtering on the whole spectrum without loss of range information, e.g. using delay line cancellers or comb filters {(G01S13/5244 takes precedence)} · CPC title