# US 2018/0024233 A1 · Bi-static radar system

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- Number: US 2018/0024233 A1
- Document ID: US20180024233A1
- Status: Published application
- Kind: A1
- Application number: 15/204,056
- Filed: 2016-07-07
- Published: 2018-01-25
- Earliest claimed: 2015-08-28
- Assignees: Delphi Technologies, Inc.
- Applicants: Delphi Technologies, Inc.
- Inventors: JAMES F. SEARCY; RYAN K. ROSSITER; STEPHEN W. ALLAND
- Web page: https://patentgrep.com/patent/US20180024233A1

## CPC

- G01S 13/003: {Bistatic radar systems; Multistatic radar systems}
- G01S 7/006: {using shared front-end circuitry, e.g. antennas (G01S13/765, G01S13/825 take precedence)}
- G01S 7/032: {Constructional details for solid-state radar subsystems}
- G01S 7/4008: {of transmitters}
- G01S 13/87: Combinations of radar systems, e.g. primary radar and secondary radar
- 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 bi-static radar system configured for coherent detection of a radar-signal includes a plurality of radar-transceivers, a controller, and a communications device. The plurality of radar-transceivers is characterized as physically spaced apart with respect to each other. The controller is in communication with the each of the radar-transceivers and is configured to coherently operate each of the radar-transceivers. The communications device communicates both a reference-clock signal and a frame-sync signal from the controller to each of the plurality of radar-transceivers whereby the plurality of radar-transceivers operate coherently. Alternatively, the system may include a reference-signal generator, a transmitter, and a plurality of receivers. The reference-signal generator generates a reference-signal characterized by a reference-frequency proportional to a fraction of a radar-frequency of a radar-signal transmitted. The transmitter generates the radar-signal at the radar-frequency based on the reference-signal. The plurality of receivers operates coherently to detect the radar-signal based on the reference-signal.

## Claims

### Claim 1

A bi-static radar system configured for coherent detection of a radar-signal, said system comprising:
a plurality of radar-transceivers, said plurality of radar-transceivers characterized as physically spaced apart with respect to each other;
a controller in communication with the each of the radar-transceivers, said controller configured to coherently operate each of the radar-transceivers; and
a communications device configured to communicate both a reference-clock signal and a frame-sync signal from the controller to each of the plurality of radar-transceivers whereby the plurality of radar-transceivers operate coherently.

### Claim 2

A bi-static radar system configured for coherent detection of a radar-signal, said system comprising:
a reference-signal generator operable to generate a reference-signal characterized by a reference-frequency that is proportional to a fraction of a radar-frequency of a radar-signal transmitted by the system;
a transmitter operable to generate the radar-signal at the radar-frequency based on the reference-signal; and
a plurality of receivers operable to coherently detect the radar-signal based on the reference-signal.

### Claim 3 (depends on 2)

The system in accordance with claim 2, wherein the plurality of receivers includes as a first receiver and a second receiver spaced apart from the first receiver.

### Claim 4 (depends on 3)

The system in accordance with claim 3, wherein the first receiver is spaced apart from the second receiver by more than five-hundred-millimeters (500 mm).