US 11,906,614 B2Granted

Slow-time modulation for multiple radar channels

AssigneeAptiv Technologies AG

InventorsZhengyu Peng, Zhengzheng Li, Christopher D. Gianelli

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Abstract

This document describes techniques and systems directed at slow-time modulation for multiple radar channels. A set of transmit channels are modulated using code sequences to phase-modulate transmission signals. A second set of transmit channels are modulated using the same codes for phase modulation as well as using a frequency phase shift. Demodulation is achieved by multiplying received signals by the code sequences. Fast Fourier transforms (FFT) are applied to the received signals to generate a range-Doppler map for each receive channel. A non-coherent integration is performed on the range-Doppler maps to form a range-Doppler average map. The range-Doppler average map is shifted by the frequency phase shift, and the minimal of the range-Doppler average map and the shifted range-Doppler average map is retained. These techniques may reduce the impact of signal residue and increase angular resolution by enabling multiple transmit channels to be utilized.

Claims20

Dependent claims

A method, the method comprising:

simultaneously transmitting, by a radar system, a first plurality of chirp signals with first multiple channels of the radar system and a second plurality of chirp signals with second multiple channels of the radar system that are different than the first multiple channels using a slow-time modulation process comprising:
modulating, using code-division multiplexing, the first plurality of chirp signals with a phase-modulation that is defined by a sequence of codes;
modulating the second plurality of chirp signals using:
code-division multiplexing with the phase-modulation that is defined by the sequence of codes;
and
frequency-division multiplexing, based on a frequency shift that is defined by a frequency shift sequence;
responsive to simultaneously transmitting the first plurality of chirp signals and the second plurality of chirp signals, receiving, from one or more receive channels, a plurality of chirp returns corresponding to the first plurality of chirp signals and the second plurality of chirp signals;
and
responsive to demodulating the plurality of chirp returns based on the sequence of codes, outputting, by the radar system, to an automotive system, radar data identifying objects inferred from the demodulated plurality of chirp returns.

6 more elements

A multiple-input-multiple-output (MIMO) radar system comprising:

multiple first transmit channels;
multiple second transmit channels that are different than the first multiple channels;
multiple receive channels;
and
at least one processor configured to:
simultaneously transmit a first plurality of chirp signals with the first multiple channels and a second plurality of chirp signals with the second multiple channels using a slow-time modulation method comprising:
modulating, using code-division multiplexing, the first plurality of chirp signals with a phase-modulation that is defined by a sequence of codes;
modulating the second plurality of chirp signals based on:
code-division multiplexing with the phase-modulation that is defined by the sequence of codes;
and
frequency-division multiplexing based on a frequency shift that is defined by a frequency shift sequence;
responsive to simultaneously transmitting the first plurality of chirp signals and the second plurality of chirp signals, receive, from multiple receive channels, a plurality of chirp returns corresponding to the first plurality of chirp signals and the second plurality of chirp signals;
and
responsive to demodulating the plurality of chirp returns in slow-time, output, to an automotive system, radar data identifying objects inferred from the demodulated plurality of chirp returns.

11 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/356,241Filed 23 Jun 2021 · us provisional application
Priority: 12 Feb 2021
Published: US 2022/0260699 A118 Aug 2022
Granted: 20 Feb 2024
Term ends: Not estimatedThe source records don’t support an estimate.

Classification13 codes

G01S 13/288
Using coded pulses: phase modulated
G01S 7/023
Of systems according to group G01S13/00: interference mitigation, e.g. reducing or avoiding non-intentional interference with other…
G01S 7/2926
Based on data belonging to a number of consecutive radar periods: by integration
G01S 7/356
Receivers: involving particularities of FFT processing

Family

Application63/148,928Us provisional application · filed 12 Feb 2021
US 2022/0260699 A1Pre-grant publication · published 18 Aug 2022
US 11,906,614 B2This patent

From the US filing history. Foreign family members aren’t listed.

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