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US 10,374,675 B1Granted
Direct digital synthesis based phase shift digital beam forming
AssigneeRaytheon Company
InventorsHarry B. Marr, Daniel Thompson, Ralston S. Robertson
Life of this patent
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Abstract
A system for beamforming, in a phased array antenna. Subtraction of a sinusoidal signal from a received signal, or from a signal to be transmitted, is used to shift the phase of the received signal, or from a signal to be transmitted. A separate sinusoidal signal may be generated for each antenna array element, making it possible to shift the phase on a per-element basis, to perform beamforming.
Claims15
A transmitter, comprising:
- a first antenna element;
- a second antenna element;
- a first waveform generator;
- a second waveform generator;
- a third waveform generator;
- a first differencing circuit,
- having:
- a first input connected to the first waveform generator,
- a second input connected to the second waveform generator, and
- an output operatively coupled to the first antenna element, and
- being configured to generate at the output a difference between a signal at the first input and a signal at the second input;
- and
- a second differencing circuit,
- having:
- a first input connected to the first waveform generator,
- a second input connected to the third waveform generator, and
- an output operatively coupled to the second antenna element, and
- being configured to generate at the output a difference between a signal at the first input and a signal at the second input,
- wherein the first waveform generator is configured to generate a modulated waveform.
16 more elements
A receiver, comprising:
- a first antenna element;
- a second antenna element;
- a first waveform generator;
- a second waveform generator;
- a first differencing circuit,
- having:
- a first input operatively coupled to the first antenna element,
- a second input connected to the first waveform generator, and
- an output, and
- being configured to generate at the output a difference between a signal at the first input and a signal at the second input;
- a second differencing circuit,
- having:
- a first input operatively coupled to the second antenna element,
- a second input connected to the second waveform generator, and
- an output, and
- being configured to generate at the output a difference between a signal at the first input and a signal at the second input;
- and
- an adding circuit, having a first input connected to the output of the first differencing circuit and a second input connected to the output of the second differencing circuit,
- wherein each of:
- the first waveform generator;
- and
- the second waveform generator
- comprises a direct digital synthesizer.
20 more elements
Dependencies are inferred from the claim text.