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US 10,838,035 B2Granted
Characterizing multipath delays in antenna array and synthetic aperture radar systems
AssigneeMassachusetts Institute of Technology
InventorsSwarun Suresh Kumar, Dina Katabi
Life of this patent
Estimating the term…
Abstract
Multiple radio transmissions are processed to determine, for each of a number of directions of arrival of the radio transmissions, a most direct direction of arrival, for example, to distinguish a direct path from a reflected path from the target. In some examples, the radio transmissions include multiple frequency components, and channel characteristics at different frequencies are compared to determine the direct path.
Claims17
A method comprising:
- receiving a plurality of radio transmissions from a target device, each radio transmission of the plurality of radio transmissions being received at a plurality of antennas at known locations, wherein each radio transmission comprises a plurality of components at different transmission frequencies;
- processing the received radio transmissions to determine, for each of a plurality of directions of arrival of the radio transmissions, a characterization of a channel from the target device, the characterization of the channel including characterizations of the channel at the different transmission frequencies of the components of the radio transmissions, wherein at least one of the directions of arrival corresponds to a reflected path from the target device to the locations of the antenna;
- and
- determining a most direct direction of arrival from the plurality of directions of arrival, including computing for each direction of arrival a quantity representing a path length from the target using the characterization of the channel for the direction of arrival at the different transmission frequencies, and comparing said computed quantities to determine the most direct direction;
- wherein receiving and processing the plurality of radio transmissions from a target device at the plurality of antennas at known locations includes applying a Synthetic Aperture Radar (SAR) approach.
2 more elements
A localization system comprising:
- a plurality of antenna;
- a receiver coupled to the plurality of antennas for receiving radio signals acquired at the plurality of antennas, the radio signals including a plurality of radio transmissions from a target radio device;
- a signal processor coupled to the receiver configured to process the plurality radio transmissions from the target radio device to determine a most direct direction of arrival, wherein each radio transmission comprises a plurality of components at different transmission frequencies, the signal processor being configured to
- processing the received radio transmissions to determine, for each of a plurality of directions of arrival of the radio transmissions, a characterization of a channel from the target device, the characterization of the channel including characterizations of the channel at the different transmission frequencies of the components of the radio transmissions, wherein at least one of the directions of arrival corresponds to a reflected path from the target device to the locations of the antenna, and
- determining a most direct direction of arrival from the plurality of directions of arrival, including computing for each direction of arrival a quantity representing a path length from the target using the characterization of the channel for the direction of arrival at the different transmission frequencies, and comparing said computed quantities to determine the most direct direction;
- wherein receiving and processing the plurality of radio transmissions from the target device at the plurality of antennas at known locations includes applying a Synthetic Aperture Radar (SAR) approach.
3 more elements
Dependencies are inferred from the claim text.