Ultra-wideband receiver and transmitter
First Claim
1. A communication system utilizing a carrier-based ultra-wideband transmitter, said system comprising:
- a switched impulse generator to generate a low-level ultra-wideband signal characterized by a series of UWB pulses, said switched impulse generator including one of an on-off switched oscillator, an oscillator having a time-gated dc bias that alternately biases the oscillator on and off, and an impulse-gated mixer that mixes an oscillator output;
a wave filter responsive to said switched impulse generator to filter said UWB pulses to define a center-frequency thereof;
an antenna responsive to said filter to radiate a carrier-based representation of said UWB pulses at said defined center-frequency; and
a receiver that detects data from individual ones of radiated UWB pulses.
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Accused Products
Abstract
A waveform-adaptive ultra-wideband (UWB) transmitter and noise-tracking UWB receiver for use in communications, object detection and radar applications. In one embodiment, the output of an oscillator is gated by a low-level impulse generator either directly or through an optional filter. In a special case of that embodiment wherein the oscillator is zero frequency and outputs a DC bias, a low-level impulse generator impulse-excites a bandpass filter to produce an UWB signal having an adjustable center frequency and desired bandwidth based on a characteristic of the filter. In another embodiment, the low-level impulse signal is approximated by a time-gated continuous-wave oscillator to produce an extremely wide bandwidth pulse with deterministic center frequency and bandwidth characteristics. The low-level impulse signal can be generated digitally. The UWB signal may be modulated to carry data, or may be used in object detection or ranging applications. The power amplifier may be gated to provide a power-efficient UWB transmitter. The UWB transmitter exhibits well defined and controllable spectral characteristics. The UWB transmitter is capable of extremely high pulse repetition frequencies (PRFs) and data rates in the hundreds of megabits per second or more, frequency agility on a pulse-to-pulse basis allowing frequency hopping if desired, and extensibility from below HF to millimeter wave frequencies.
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Citations
18 Claims
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1. A communication system utilizing a carrier-based ultra-wideband transmitter, said system comprising:
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a switched impulse generator to generate a low-level ultra-wideband signal characterized by a series of UWB pulses, said switched impulse generator including one of an on-off switched oscillator, an oscillator having a time-gated dc bias that alternately biases the oscillator on and off, and an impulse-gated mixer that mixes an oscillator output; a wave filter responsive to said switched impulse generator to filter said UWB pulses to define a center-frequency thereof; an antenna responsive to said filter to radiate a carrier-based representation of said UWB pulses at said defined center-frequency; and a receiver that detects data from individual ones of radiated UWB pulses. - View Dependent Claims (3, 4, 5, 6, 7, 8)
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2. A method of detecting an object utilizing ultra-wideband transmitting techniques, said method comprising:
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impulse-switching an oscillator to generate a low-level ultra-wideband signal; wave filtering said low-level ultra-wideband signal to provide a carrier and a center frequency thereof; after said filtering step, transmitting a representation of said low-level ultra-wideband signal; and after said transmitting step, receiving from said object a reflected pulse of said representation of said ultra-wideband signal thereby to detect said object. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of transmitting a carrier-based ultra wideband pulse, said method comprising:
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generating a low-level UWB pulse that includes an energy burst having a few cycles of RF energy at a defined carrier frequency; wave filtering the energy burst to reject out-of-band emissions; and radiating a carrier-based ultra wideband representation of said energy burst at said defined carrier frequency. - View Dependent Claims (18)
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Specification