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US 11,686,815 B2Granted
Character recognition in air-writing based on network of radars
AssigneeInfineon Technologies AG
InventorsAvik Santra, Muhammad Arsalan
Life of this patent
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Abstract
In an embodiment, a method for air-writing character recognition includes: determining a position of an object in a monitoring space using a plurality of millimeter-wave radars, where each millimeter-wave radar of the plurality of millimeter-wave radars has a field of view, and where an intersection of the fields of view of the plurality of millimeter-wave radars forms the monitoring space; tracking the position of the object in the monitoring space over time using the plurality of millimeter-wave radars; determining a character symbol depicted by the tracked position of the object over time using a neural network (NN); and providing a signal based on the determined character symbol.
Claims22
A method for air-writing character recognition, the method comprising:
- transmitting, by a plurality of millimeter-wave radars, at least one chirp towards a monitoring space, wherein each millimeter-wave radar of the plurality of millimeter-wave radars has a field of view, and wherein an intersection of the fields of view of the plurality of millimeter-wave radars forms the monitoring space;
- receiving, by the plurality of millimeter-wave radars, an echo of at least one chirp from the monitoring space;
- generating a beat signal based on the echo of the at least one chirp;
- determining a beat frequency based on the beat signal;
- determining a first range based on the beat frequency;
- determining a beat signal phase based on the first range;
- generating a demodulated beat signal based on the determined beat frequency and the determined beat signal phase;
- determining a demodulated beat phase based on the demodulated beat signal;
- determining a demodulated beat range based on the demodulated beat phase;
- determining a fine range estimate based on the demodulated beat range;
- determining a position of an object in the monitoring space based on the fine range estimate;
- tracking the position of the object in the monitoring space over time using the plurality of millimeter-wave radars;
- determining a character symbol depicted by the tracked position of the object over time using a neural network (NN);
- and
- providing a signal based on the determined character symbol.
12 more elements
A millimeter-wave radar system comprising:
- a plurality of millimeter-wave radars, wherein each millimeter-wave radar of the plurality of millimeter-wave radars is configured to have a field of view, wherein an intersection of the fields of view of the plurality of millimeter-wave radars forms a monitoring space, and wherein the plurality of millimeter-wave radars is configured to transmit at least one chirp towards the monitoring space, receive an echo of at least one chirp from the monitoring space, and generate a beat signal based on the echo of the at least one chirp;
- and
- a controller configured to:
- determine a beat frequency based on the beat signal,
- determine a first range based on the beat frequency,
- determine a beat signal phase based on the first range,
- generate a demodulated beat signal based on the determined beat frequency and the determined beat signal phase,
- determine a demodulated beat phase based on the demodulated beat signal,
- determine a demodulated beat range based on the demodulated beat phase,
- determine a fine range estimate based on the demodulated beat range,
- determine a position of an object in the monitoring space based on the fine range estimate,
- track the position of the object in the monitoring space over time based on the determined position using the plurality of millimeter-wave radars,
- determine a character symbol depicted by the tracked position of the object over time using a neural network (NN), and
- provide a signal based on the determined character symbol.
11 more elements
A device comprising:
- a housing;
- a screen disposed in the housing;
- a plurality of millimeter-wave radars disposed in the housing, wherein each millimeter-wave radar of the plurality of millimeter-wave radars is configured to have a field of view, wherein an intersection of the fields of view of the plurality of millimeter-wave radars forms a monitoring space, wherein the screen faces the monitoring space, and wherein the plurality of millimeter-wave radars is configured to transmit at least one chirp towards the monitoring space, receive an echo of at least one chirp from the monitoring space, and generate a beat signal based on the echo of the at least one chirp;
- and
- a controller configured to:
- determine a beat frequency based on the beat signal,
- determine a first range based on the beat frequency,
- determine a beat signal phase based on the first range,
- generate a demodulated beat signal based on the determined beat frequency and the determined beat signal phase,
- determine a demodulated beat phase based on the demodulated beat signal,
- determine a demodulated beat range based on the demodulated beat phase,
- determine a fine range estimate based on the demodulated beat range,
- determine a position of an object in the monitoring space based on the fine range estimate,
- track the position of the object in the monitoring space over time based on the determined position using the plurality of millimeter-wave radars,
- determine a character symbol depicted by the tracked position of the object over time using a neural network (NN), and
- provide a signal based on the determined character symbol.
13 more elements
Dependencies are inferred from the claim text.