Waveform adaptive ultra-wideband transmitter
Patent 6026125 Issued on February 15, 2000. Estimated Expiration Date: 
May 16, 2017. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
May 16, 2017. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3500404 3612899 3662316 3728632 Detector having a constant false alarm rate Base band speed sensor Radar clutter reduction by use of frequency-diverse, wideband pulse-compression waveforms Spread spectrum radio transmission system Baseband detector with anti-jam capability Narrow range gate baseband receiver InventorsAssigneeApplicationNo. 857836 filed on 05/16/1997US Classes:375/295TRANSMITTERSExaminersPrimary: Chin, StephenAssistant: Fan, Chieh M. Attorney, Agent or FirmInternational ClassH04L 027/04AbstractA waveform adaptive transmitter that conditions and/or modulates the phase, frequency, bandwidth, amplitude and/or attenuation of ultra-wideband (UWB) pulses. The transmitter confines or band-limits UWB signals within spectral limits for use in communication, positioning, and/or radar applications. One embodiment comprises a low-level UWB source (e.g., an impulse generator or time-gated oscillator (fixed or voltage-controlled)), a waveform adapter (e.g., digital or analog filter, pulse shaper, and/or voltage variable attenuator), a power amplifier, and an antenna to radiate a band-limited and/or modulated UWB or wideband signals. In a special case where the oscillator has 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, a 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 UWB signal may be modulated to carry multi-megabit per second digital data, or may be used in object detection or for ranging applications. Activation of the power amplifier may be time-gated in cadence with the UWB source thereby to reduce inter-pulse power consumption. 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.Field of SearchTRANSMITTERSTRANSCEIVERS RADAR EW (ELECTRONIC WARFARE) PRESENCE DETECTION ONLY CLUTTER ELIMINATION With a delay line (e.g., serpentine transmission line, frequency scanning) BASE BAND SYSTEM By motion detection Convertible to different type (e.g., AM to FM) TRANSMITTER Plural separate transmitters or channels Where energy is reflected (e.g., reflectometry) | |
