Abstract:
A precision timing generator (415, figure 4) includes a combiner (412) that provides a timing signal by combining a coarse timing signal (428) and a fine timing signal (429) derived from a phase-shifted sinusoidal signal (508) that has a desired phase shift. The coarse timing generator (404) generates the coarse timing signal from a clock signal (416) and a timing command input (420). The fine timing generator (408) includes a sinusoidal-signal generator (504) that receives the clock signal and generates a sinusoidal signal. The fine timing generator (408) also includes a phase shifter (508) that receives the sinusoidal signal and the timing command (420) input and shifts the phase of the sinusoidal signal based on the timing input to generate the phase shifted sinusoidal signal.
Abstract:
A method and system for applying delay codes to pulse train signals (10 and 12) is provided. The delay codes vary the time offset (X) between asynchronous pulse train signals (10 and 12) to eliminate persistence of pulse coincidences. The pulse train signal may comprise a repeating pulse train. The delay codes specify delays between individual pulse trains or some number of pulse trains. The delay codes result in averaging of pulse coincidences between the pulse train signals (10 and 12) over time. Additionally, the delay codes may be generated using a pseudorandom code generation technique.
Abstract:
A method and system for receiving time spaced signals transmitted in accordance with a time layout is provided. The time spaced signals convey an intelligent signal. The time spaced signals are received at an antenna. Once received, the time spaced signals can be coherently detected. Coherent detection may be accomplished by correlating (1310) the received signals with a template signal (1312). The detection process can also include integration (1314) of the received signals. The coherently detected signals are then contributed to a plurality of intermediate signals based on an interleaving order (1308), which may be predetermined or specified by an interleaving code. Each of the plurality of intermediate signals can then be separately integrated (1316), for example to produce bits of data. The bits of data are ordered to produce the at least one intellingence signal based on a bit order, which may be predetermined or specified by a bit ordering code (1322).
Abstract:
An RF transmitter includes a reference signal generator, a signal generator, and a mixer. The reference signal generator provides a reference signal that has a prescribed or desired frequency. The signal generator provides an operating signal in response to a selection signal. The operating signal has a frequency that equals the frequency of the reference signal multiplied by an integer number. The mixer mixes the operating signal with another signal to generate a transmission signal. An RF receiver is also disclosed.
Abstract:
A system, method and computer program product for positioning pulses, including positioning pulses within a specified time layout according to one or more codes to produce a pulse train (108) having one or more predefined spectral characteristics where a difference in time position between adjacent pulses positioned to produce a spectral characteristic differs from another difference in time position between other adjacent pulses positioned to produce the spectral characteristic. The present invention may include shaping a code spectrum according to a spectral template in order to preserve a pre-defined code characteristic. A pre-defined code characteristic can include desirable correlation, or spectral properties. A transmitter incorporating the present invention can avoid transmitting at a particular frequency. Similarly, a receiver can avoid interference with a signal transmitting at a particular frequency. A radar system, can avoid a radar jammer attempting to jam a particular frequency.
Abstract:
An RF transmitter includes a reference signal generator, a signal generator, and a mixer. The reference signal generator provides a reference signal that has a prescribed or desired frequency. The signal generator provides an operating signal in response to a selection signal. The operating signal has a frequncy that equals the frequency of the reference signal multiplied by a number. The mixer mixes the operting signal with another signal to generate a transmission signal. An RF receiver includes a first mixer, a second mixer, an integrator/sampler, and a signal generator. The first mixer receives as its inputs an input RF signal and a second input signal, and mixes its input signals to genrate a mixed signal. The integrator/sampler receives the mixed signal and processes it to provde an output signal. The integrator/sampler receives the mixed signal and processes it to provide an output signal. The signal generator provides an operating signal in response to a selection signal. The operating signal has a frequency equal to the frequency of a reference signal, multiplied by a number. The second mixer mixes the operating signal with a template signal to generate the second input signal of the first mixer.
Abstract:
An apparatus for conveying electromagnetic energy intermediate a host device and a medium substantially adjacent to the apparatus includes: (a) a transceiver for transmitting the energy to and receiving the energy from the medium; (b) a transmission structure for conveying signals to or from the host device; and (c) a feed structure coupling the transceiver with the transmission structure. The transceiver includes a planar metal layer arrayed upon a dielectric substrate. The metal layer is bounded by a first edge and a second edge. The first and second edges cooperate to form a bight having a first and a second arm establishing a metal-free area intermediate the first and second arms. The first arm presents a first terminal locus and the second arm presents a second terminal locus. The feed structure is coupled with the first and second terminal loci to effect the coupling.
Abstract:
A system and method of implementing precision time delays that provides important and novel improvements over prior techniques of implementing time delays by utilizing a new strategy for selecting the values in the sine and cosine lookup tables. Sine and cosine values which result in non-uniform amplitudes enable increased overall accuracy with fewer bits communicated from the look-up tables to the analogue portion of the system. Further, herein is provided the addition of a variable amplitude threshold crossing capability following the combining of the sine and cosine signals. The time delay accuracy of the resulting phase and amplitude hybrid system can be improved either by increasing the number of bits in the sine/cosine phase management section or by increasing the number of bits in the amplitude section. There is provided herein an optimum strategy for choosing the number of bits used in the phase and amplitude sections for the best overall delay accuracy with the fewest overall control bits.
Abstract:
The present invention relates to a method and system that emulates a desired waveform by producing a time profile of the desired waveform, which is characterized by a plurality of sample values, and generating a plurality of RF waveforms, each RF waveform of the plurality of RF waveforms having a polarity and scaled energy based on a corresponding one of the plurality of sample values, to produce an aggregate RF energy having spectral characteristics that approximate the spectral characteristics of the desired waveform.
Abstract:
First-arriving-pulse detector (FAP) circuitry includes a correlator circuitry and a threshold circuitry. The correlator circuitry correlates a received signal with a template signal to provide an output signal. The threshold circuitry provides a first-arriving-pulse signal depending on the relative values of the output signal of the correlator circuitry and a threshold signal.