Abstract: An apparatus for passive coherent location includes a forecaster, an evaluator, a receiver, and a correlator. The forecaster generates a prediction of a radio-frequency signal transmitted from an antenna of a broadcasting service. The evaluator generates an effectiveness metric from the prediction of the radio-frequency signal. The receiver receives the radio-frequency signal that an object reflects from the antenna to the receiver. The correlator determines, from the radio-frequency signal reflected from the object as received at the receiver, an ambiguity function having a maximum at a temporal offset and a Doppler shift. The temporal offset and the Doppler shift at the maximum partially determine at least a position of the object. The apparatus optionally includes a selector for tuning the receiver to the radio-frequency signal in response to the effectiveness metric.

Abstract: A radar pulse generator includes a multiplexer, a polyphase synthesizer, a first signal channel and a second signal channel. The multiplexer has a baseband radar pulse input, a multiplexer control input, a first channel output and a second channel output. The baseband radar pulse input signal is a single channel baseband radar pulse signal. The multiplexer control input signal selects one of the group consisting of the first channel output and the second channel output. The polyphase synthesizer synthesizes the first channel output signal, synthesizes the second channel output signal and outputs a desired radar pulse signal based on the synthesized first channel output signal and the synthesized second channel output signal. The first signal channel provides the first channel output signal from the first channel output to the polyphase synthesizer. The second signal channel provides the second channel output signal from the second channel output to the polyphase synthesizer.

Abstract: A signal processor is provided for use with a first signal generator and a second signal generator, wherein the first signal generator provides a first signal having a first amplitude and the second signal generator provides a second signal having a second amplitude. The signal processor includes: a threshold component that stores a threshold value; a threshold detection component that generates a sum of the first amplitude and the second amplitude, compares the sum with the threshold value, generates a modification required signal when the sum is greater than the threshold value; a delay component that generates a delay signal; and a delay processor operable to output an output signal based on the sum of a modified first signal and the second signal when the sum is greater than the threshold value.

Abstract: A radar pulse generator includes a multiplexer, a polyphase synthesizer, a first signal channel and a second signal channel. The multiplexer has a baseband radar pulse input, a multiplexer control input, a first channel output and a second channel output. The baseband radar pulse input signal is a single channel baseband radar pulse signal. The multiplexer control input signal selects one of the group consisting of the first channel output and the second channel output. The polyphase synthesizer synthesizes the first channel output signal, synthesizes the second channel output signal and outputs a desired radar pulse signal based on the synthesized first channel output signal and the synthesized second channel output signal. The first signal channel provides the first channel output signal from the first channel output to the polyphase synthesizer. The second signal channel provides the second channel output signal from the second channel output to the polyphase synthesizer.

Abstract: A system includes a first low noise amplifier, a second low noise amplifier, a local oscillator, a signal splitter, a first mixer, a second mixer, an analog to digital converter, a digital channelizer and beam-former and a phase error correcting component. The phase error correcting component is configured to generate a first phase error correction coefficient and a second phase error correction coefficient. The digital channelizer and beam-former includes a polyphase filter and a time division multiplexer. The time division multiplexer is configured to output a beam-formed received signal based on a first modified filtered signal and the second modified filtered signal.

Abstract: A signal detection method that allows characterization of a modulated signal to be efficiently determined. The method comprises the steps of receiving a data signal, processing the data signal to determine its value squaring the value of the signal; filtering the squared signal value to remove DC content; evaluating the resulting signal to determine if a single sinusoidal value remains; and determining that the presence of a single sinusoidal value as the resulting signal from the squaring and filtering steps indicates that the received data signal is a phase-shift key signal or conversely that the absence of such after a given number of cycle of squaring and filtering indicates a different modulation technique is present in the signal.

Abstract: A signal detection method that allows characterization of a modulated signal to be efficiently determined. The method comprises the steps of receiving a data signal, processing the data signal to determine its value squaring the value of the signal; filtering the squared signal value to remove DC content; evaluating the resulting signal to determine if a single sinusoidal value remains; and determining that the presence of a single sinusoidal value as the resulting signal from the squaring and filtering steps indicates that the received data signal is a phase-shift key signal or conversely that the absence of such after a given number of cycle of squaring and filtering indicates a different modulation technique is present in the signal.