# US 12,007,465 B2 · Radar apparatus and method with content embedded in the radar signal

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- Number: US 12,007,465 B2
- Document ID: US12007465B2
- Status: Granted
- Kind: B2
- Application number: 17/505,434
- Filed: 2021-10-19
- Published: 2023-04-20
- Granted: 2024-06-11
- Earliest claimed: 2021-10-19
- Assignees: NXP B.V.
- Applicants: NXP B.V.
- Inventors: Franz Lampel; Alessio Filippi
- Web page: https://patentgrep.com/patent/US12007465B2

## CPC

- G01S 7/006: {using shared front-end circuitry, e.g. antennas (G01S13/765, G01S13/825 take precedence)}
- G01S 13/343: {using sawtooth modulation}
- G01S 7/023: {Interference mitigation, e.g. reducing or avoiding non-intentional interference with other HF-transmitters, base station transmitters for mobile communication or other radar systems, e.g. using electro-magnetic interference [EMI] reduction techniques (auxiliary means for detecting or identifying radar signals or the like G01S7/021; means for anti-jamming G01S7/36)}
- G01S 7/2813: {Means providing a modification of the radiation pattern for cancelling noise, clutter or interfering signals, e.g. side lobe suppression, side lobe blanking, null-steering arrays (specially adapted to secondary radar systems G01S13/762; aerials or aerials systems H01Q21/29, H01Q25/00)}
- G01S 7/354: {Extracting wanted echo-signals (Doppler systems G01S13/50)}
- G01S 13/931: of land vehicles
- G01S 2013/9316: {combined with communication equipment with other vehicles or with base stations}
- G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES

## Abstract

A method and apparatus are provided in which receiver circuitry and signal processing circuitry may reside. The receiver circuitry receives a FMCW radar signal having a content signal (e.g., a random or information signal) embedded into a radar waveform and indicating a relationship in the FMCW radar signal between beat frequency and time delay. The signal processing circuitry may apply a filter (e.g., filtering with a group delay that approximates or relates to the relationship) that causes a residual error in, due to dispersion of, the content signal, and may account for (e.g., mitigate) the residual error by introduction of a dispersion-related function in further processing of the content signal.

## Claims

### Claim 1

An apparatus comprising:
receiver circuitry to receive a frequency modulated continuous wave (FMCW) radar signal having a content signal embedded into a radar waveform and having a relationship between beat frequency and time delay; and
signal processing circuitry to apply a filter to account for the time delay, the application of the filter causes a residual error in the content signal, and the signal processing circuitry to account for the residual error by introduction of a dispersion-related function in further processing of the content signal, the signal processing circuitry comprising:
a first delay correction circuit,
a second delay correction circuit different from the first correction delay circuit, and
an equalization circuit having a first input coupled to an output of the first delay correction circuit and a second input coupled to the output of the second delay correction circuit.

### Claim 2 (depends on 1)

The apparatus of claim 1, wherein the content signal is embedded into a radar waveform by phase modulation, and wherein the filter is an all-pass filter that is associated with a group delay that approximates or relates to the relationship between beat frequency and time delay.

### Claim 3 (depends on 2)

The apparatus of claim 2, wherein the signal processing circuitry is to account for the time delay by mitigation or removal of the time delay and is to account for the residual error by mitigation or removal of the residual error.

### Claim 4 (depends on 1)

The apparatus of claim 1, wherein the first delay correction circuit to provide a processed signal to account for the time delay while noise associated with the content signal remains in the processed signal, and the equalization circuit responsive to an output signal from the first delay correction circuit and to an output signal from the second delay correction circuit to account for the residual error and to facilitate removal of the noise associated with the content signal from the radar signal.

### Claim 5 (depends on 1)

The apparatus of claim 1, wherein the content signal is embedded into a radar waveform by continuous phase modulation.

### Claim 6 (depends on 1)

The apparatus of claim 1, wherein in response to accounting for the residual error, the signal processing circuitry is to carry out further radar signal processing of a processed version of the received FMCW radar signal.

### Claim 7 (depends on 1)

The apparatus of claim 1, wherein the content signal refers to or includes an information signal, and wherein the signal processing circuitry is to respond to or interpret the information signal.

### Claim 8 (depends on 1)

The apparatus of claim 1, wherein the content signal refers to or includes a random signal.

### Claim 9 (depends on 1)

The apparatus of claim 1, wherein the content signal refers to or includes a signal to improve robustness of the receiver circuitry to interference.

### Claim 10 (depends on 1)

The apparatus of claim 1, further including an all-pass filter to respond to the signal processing circuitry by removing the embedded content signal, wherein the all-pass filter is to remove the embedded content signal in the time domain.

### Claim 11 (depends on 10)

The apparatus of claim 10, wherein the all-pass filter is to have a linear group delay.

### Claim 12 (depends on 10)

The apparatus of claim 10, wherein the all-pass filter is to have a linear group delay and a response that is nonlinear which causes the dispersion of the communication signal in an alignment process associated with or ensuing from application of the filter.

### Claim 13 (depends on 1)

The apparatus of claim 1, further including a radar-signal transmitter, wherein the signal processing circuitry is to provide an alignment through use of an all-pass filter that has a linear group delay associated with the time delay, and, in response to accounting or mitigating for the residual error, the signal processing circuitry is to carry out further radar signal processing of the received FMCW radar signal.

### Claim 14

A method comprising:
via receiver circuitry, receiving a FMCW radar signal having a content signal embedded into a radar waveform and indicating a relationship in the FMCW radar signal between beat frequency and time delay; and
via signal processing circuitry,
applying a filter and processing by way of a first delay correction circuit to account for the time delay, the application of the filter causing a residual error in the content signal, and
accounting for the residual error by way of an equalization circuit responsive to an output signal from the first delay correction circuit and to an output signal from a second delay correction circuit different from the first delay correction circuit of a dispersion-related function in further processing of the content signal.

### Claim 15 (depends on 14)

The method of claim 14, wherein the content signal refers to or includes at least one or combination of the following: an information signal; a random signal; and a signal to maintain robustness of the receiver in presence of interference.

### Claim 16 (depends on 14)

The method of claim 14, wherein the signal processing circuitry removes the embedded content signal after providing an alignment through use of an all-pass filter that has a linear group delay, and, in response to applying the filter and accounting for the residual error, the signal processing circuitry carries out further radar signal processing of the received FMCW radar signal.

### Claim 17 (depends on 14)

The method of claim 14, wherein the signal processing circuitry is to account for the residual error and/or the dispersion, by dividing the received FMCW radar signal by a dispersed version of a reference signal corresponding to the content signal.

### Claim 18 (depends on 14)

The method of claim 14, wherein applying of a filter includes using an all-pass filter to account for the time delay.

### Claim 19 (depends on 14)

The method of claim 14, further including using an all-pass filter as part of an alignment process, wherein the all-pass filter operates on the received radar signal in the time domain.

### Claim 20 (depends on 14)

The method of claim 14, further including dividing the received signal by the dispersed reference communication signal, and wherein the content signal is embedded into a radar waveform of the FMCW radar signal by phase modulation.