# US 10,481,245 B2 · High range resolution radar profiling using frequency jump burst-pulse doppler waveform and processing

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- Number: US 10,481,245 B2
- Document ID: US10481245B2
- Status: Granted
- Kind: B2
- Application number: 15/200,418
- Filed: 2016-07-01
- Published: 2018-01-04
- Granted: 2019-11-19
- Earliest claimed: 2016-07-01
- Assignees: Raytheon Company
- Applicants: Raytheon Company
- Inventors: Ronald LaPat; Pierre Jean-Laurent; Anthony E. LoPresti; Harry Mieras; Thong Pham
- Web page: https://patentgrep.com/patent/US10481245B2

## CPC

- G01S 7/414: {Discriminating targets with respect to background clutter}
- G01S 7/2922: {by using a controlled threshold}
- G01S 7/4004: {of parts of a radar system}
- G01S 13/0209: {Systems with very large relative bandwidth, i.e. larger than 10 %, e.g. baseband, pulse, carrier-free, ultrawideband}
- G01S 13/18: wherein range gates are used
- G01S 13/34: 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
- G01S 13/5246: {post processors for coherent MTI discriminators, e.g. residue cancellers, CFAR after Doppler filters}
- G01S 13/582: {adapted for simultaneous range and velocity measurements}
- G01S 7/2923: {based on data belonging to a number of consecutive radar periods}
- G01S 7/4069: {involving a RF signal injection}
- G01S 7/4091: {during normal radar operation}
- 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

The concepts, systems and methods described herein are directed towards frequency jump burst-pulse-Doppler (FJB-PD) waveforms and processing to provide wideband, high range resolution (HRR) radar profiling capability in a clutter dense environment. The method includes transmitting a FJB-PD waveform comprising a plurality of frequency steps over a predetermined time period with each frequency step having a plurality of pulses. The method further includes receiving one or more FJB-PD pulse returns corresponding to the FJB-PD waveform and identifying one or more target detections in the one or more FJB-PD pulse returns. A set of range swaths may be extracted for each of the one or more target detections and a wideband spectrum may be generated for each of the sets of range swaths using FJB coherent integration. A clutter suppressed HRR profile may be generated for each of the target detections based on the respective wideband spectrum.

## Claims

### Claim 1

A method comprising:
transmitting a frequency jump burst-pulse Doppler (FJB-PD) waveform comprising a plurality of frequency steps over a predetermined time period, each frequency step having a plurality of pulses;
receiving one or more FJB-PD pulse returns corresponding to the FJB-PD waveform;
identifying one or more target detections in the one or more FJB-PD pulse returns;
extracting a set of range swaths for each of the identified one or more target detections;
generating a wideband spectrum for each of the sets of range swaths using FJB coherent integration, wherein at least one wideband spectrum is generated for each of the one or more target detections; and
generating a clutter suppressed high range resolution (HRR) profile for each of the target detections based on the respective wideband spectrum.

### Claim 2 (depends on 1)

The method of claim 1, further comprising performing range-rate compensation on the one or more FJB-PD pulse returns.

### Claim 3 (depends on 1)

The method of claim 1, further comprising generating a set of range-Doppler arrays for the one or more FJB-PD pulse returns, wherein at least one range-Doppler array is generated for each frequency step.

### Claim 4 (depends on 3)

The method of claim 3, further comprising integrating the set of range-Doppler arrays over the plurality of frequency steps using non-coherent integration.

### Claim 5 (depends on 3)

The method of claim 3, further comprising performing constant false alarm rate (CFAR) processing on the set of range-Doppler arrays.

### Claim 6 (depends on 1)

The method of claim 1, further comprising performing wideband calibration on the wideband spectrum.

### Claim 7 (depends on 1)

The method of claim 1, further comprising generating the FJB-PD waveform comprising the plurality of frequency steps over the predetermined time period.

### Claim 8 (depends on 1)

The method of claim 1, further comprising generating a sequence of the plurality of pulses for each of the frequency steps, wherein each of the sequences has at least one of a constant-Doppler pulse repetition interval (PRI) or a fixed pulse repetition interval (PRI).

### Claim 9 (depends on 8)

The method of claim 8, wherein the PRI at each of the plurality of frequency steps is inversely proportional to a step center frequency of the respective frequency step.

### Claim 10 (depends on 1)

The method of claim 1, further comprising transmitting a calibration FJB-PD waveform comprising a plurality of frequency steps over a predetermined time period, each frequency step having a plurality of pulses, wherein the calibration FJB-PD waveform is transmitted internally or externally to a radar system.

### Claim 11 (depends on 10)

The method of claim 10, further comprising:
receiving calibration FJB-PD pulse returns corresponding to the calibration FJB-PD waveform; and
generating a calibration wideband spectrum based on the calibration FJB-PD pulse returns.

### Claim 12 (depends on 11)

The method of claim 11, further comprising:
comparing the calibration wideband spectrum to the wideband spectrum to detect a transfer function of the radar system; and
generating the clutter suppressed HRR profile for each of the target detections responsive to the comparison.

### Claim 13

A method comprising:
transmitting a frequency jump burst-pulse Doppler (FJB-PD) waveform comprising a plurality of frequency steps over a predetermined time period, each frequency step having a plurality of pulses;
receiving one or more FJB-PD pulse returns corresponding to the FJB-PD waveform;
generating a set of range-Doppler arrays for the one or more FJB-PD pulse returns, wherein at least one range-Doppler array is generated for each frequency step;
identifying one or more target detections in the one or more FJB-PD pulse returns using the set of range-Doppler arrays; and
extracting a set of range swaths corresponding to each of the identified one or more target detections from the set of range-Doppler arrays.

### Claim 14 (depends on 13)

The method of claim 13, further comprising generating the FJB-PD waveform comprising the plurality of frequency steps over the predetermined time period.

### Claim 15 (depends on 13)

The method of claim 13, further comprising generating a sequence of the plurality of pulses for each of the frequency steps, wherein each of the sequences has at least one of a constant-Doppler pulse repetition interval (PRI) or a fixed pulse repetition interval (PRI).

### Claim 16 (depends on 15)

The method of claim 15, wherein the PRI at each of the plurality of frequency steps is inversely proportional to a step center frequency of the respective frequency step.

### Claim 17 (depends on 13)

The method of claim 13, further comprising performing range-rate compensation on the one or more FJB-PD pulse returns.

### Claim 18 (depends on 13)

The method of claim 13, further comprising isolating one or more targets from clutter in the one or more FJB-PD pulse returns.

### Claim 19 (depends on 13)

The method of claim 13, further comprising integrating the set of range-Doppler arrays over the plurality of frequency steps using non-coherent integration.

### Claim 20 (depends on 13)

The method of claim 13, further comprising performing constant false alarm rate (CFAR) processing on the set of range-Doppler arrays.

### Claim 21 (depends on 13)

The method of claim 13, further comprising coherently integrating the set of range swaths using FJB coherent processing.

### Claim 22 (depends on 21)

The method of claim 21, further comprising processing each of the one or more target detections using FJB processing independent of another of the one or more target detections.

### Claim 23 (depends on 21)

The method of claim 21, further comprising generating clutter suppressed high range resolution (HRR) profiles for each of the target detections.