US 2020/0264266 A1Published application

Uplink Signaling and Receive Beamforming for Dual-Function Radar Communications

AssigneeUS Gov't as represented by Secretary of Air Force

InventorsAboulnasr Hassanien, Cenk Sahin, Justin Metcalf, Braham Himed

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Abstract

A communication system, method and computer program product enable transmitting information via the same spectrum as a multiple-input multiple-output (MIMO) radar using the same spectrum. First, a radar system conducts a search mode using a MIMO radar waveform. Second, an uplink communications transmitter employs a new type of signaling that allows the radar to search for targets in the spatial direction of the communication transmitter. Specifically, the MIMO radar can conduct a search task while receiving data from a communication transmitter using the same frequency allocation without blinding the MIMO radar in the direction of the target.

Claims14

Dependent claims

A dual-function radar communications (DFRC) system comprising:

more than one antenna;
a multiple input multiple output (MIMO) radar system communicatively coupled to the more than one antenna;
at least one MIMO communications system communicatively coupled to the more than one antenna;
and
a controller communicatively coupled to the MIMO radar system and the at least one MIMO communications system, the controller executing program code to enable the DFRC system to:
transmit, via the MIMO radar system, a set of pseudo-orthogonal waveforms;
transmit, via the at least one MIMO communications system, at least one communication uplink data-stream, occupying bandwidth used by the MIMO radar system, each of the at least one communication uplink data-stream having a unique spatial steering vector orthogonal to any radar targets of interest;
receive a return signal, via the more than one antenna, containing returned radar echoes reflected from targets and at least one communication uplink signal;
and
separate the returned radar echoes from the at least one communication uplink signal using spatial diversity.

7 more elements

A method for receiving radar returns and uplink communications using a dual-function radar communications (DFRC) system, the method comprising:

transmitting, via a multiple input multiple output (MIMO) radar system communicatively coupled to the more than one antenna, a set of pseudo-orthogonal waveforms;
transmitting, via one or more MIMO communications systems, at least one communication uplink data-stream, occupying bandwidth used by the MIMO radar system, each of the at least one communication uplink data-stream having a unique spatial steering vector orthogonal to any radar targets of interest;
receiving a return signal, via the more than one antenna, containing returned radar echoes reflected from targets and at least one communication uplink signal;
and
separating the returned radar echoes from the at least one communication uplink signal using spatial diversity.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/781,012Filed 4 Feb 2020
Priority: 6 Feb 2019
Published: 20 Aug 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

G01S 7/006
Transmission of data between radar, sonar or lidar systems and remote stations: using shared front-end circuitry, e.g. antennas
G01S 7/2921
Extracting wanted echo-signals: based on data belonging to one radar period
H04B 7/0413
Using two or more spaced independent antennas: mIMO systems
G01S
Radio direction-finding

Family

Application62/801,824Us provisional application · filed 6 Feb 2019
US 2020/0264266 A1This patent

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

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