An apparatus comprising a frequency standard circuit and a tracking circuit. The frequency standard circuit may be configured to generate an internal frequency standard and adjust the internal frequency standard in response to a tuning signal. The tracking circuit may be configured to receive a reference signal from an external source and a feedback signal of the internal frequency standard and generate the tuning signal. The tuning signal may be configured to synchronize the internal frequency standard to the reference signal. The internal frequency standard may be implemented local to a frequency converter. The tracking circuit may have a bandwidth that prevents unwanted content on the reference signal from corrupting the internal frequency standard.

A method for finding an orthogonal direction of a radiation source with respect a digitally optimized interference pattern of a first fixed electromagnetic element and a second fixed electromagnetic element has been established. Determining a direction of a radiation source allows for dynamic control of moving object.

A Multi-Signal Instantaneous Frequency Measurement, MIFM, system comprising a front end adapted to shift and combine signal spectra of different sub-frequency bands (SFBs) of a received wideband signal (WBS) into an intermediate frequency band (IFB) having an instantaneous bandwidth (IBW), wherein each shifted SFB signal spectrum is marked individually with SFB marking information associated with the respective sub-frequency band (SFB) and a digital receiver (3) having the instantaneous bandwidth (IBW) configured to process the shifted SFB signal spectra within the intermediate frequency band (IFB) using the SFB marking information to resolve any frequency ambiguity caused by the shifting and combining of the SFBs signal spectra.

A system and method of improving data link performance between two or more wireless data transceivers includes: clipping and inverting the data components of a communication signal which are calculated to cause non-linear saturation effects in the downstream power amplifier; delaying a first time series to align the first time series with the clipped and inverted data components of a second time series; adding the clipped and inverted data components of the second time series to the delayed first time series to obtain a modified composite waveform; creating a sacrificial band containing principal energy of the clipped and inverted data components of the second time series; harvesting the principal energy of the sacrificial band to obtain an optimized composite waveform; and causing the composite waveform to produce non-linear distortion to optimize the harvested principal energy.

Disclosed is a tuner device including an input terminal, a separator, a first amplifier, a second amplifier, and a tuner. The input terminal receives an input of a reception signal of satellite digital broadcasts. The separator is connected to the input terminal and adapted to frequency-separate a first signal and a second signal. The first signal is in a low-frequency domain of the reception signal, and the second signal is in a high-frequency domain of the reception signal. The first and second amplifiers respectively amplify the first and second signals. The tuner receives an input of output signals from the first and second amplifiers.

A transmitter includes a plurality of transmitter circuits configured to generate signals that are within the same frequency band; and a feedback circuit that is shared by the plurality of transmitter circuits, the feedback circuit being configured to feed back a part of a transmission amplification signal to a transmitter circuit, the transmission amplification signal being output from each of the plurality of transmitter circuits through a transmission amplifier, and the transmitter circuit being configured to output the transmission amplification signal among the plurality of transmitter circuits. The feedback circuit includes a frequency selective extraction unit configured to extract different-band signals in frequency bands from the transmission amplification signal, the frequency bands being different from each other, a synthesis unit configured to synthesize the different-band signals extracted by the frequency selective extraction unit, and to generate a synthesis signal, a frequency conversion unit configured to frequency-convert the synthesis signal generated by the synthesis unit by using a local signal of the same frequency, the local signal being common to a plurality of transmission paths, and a distortion compensation coefficient calculation unit configured to calculate a distortion compensation coefficient based on signals of frequency bands of the different-band signals, the distortion compensation coefficient being used when compensating for distortion of signals in outputs of the plurality of transmitter circuits.

Generally, this disclosure provides systems and methods for distributed phased array multiple input multiple output (DPA-MIMO) communications. A system may comprise a baseband processing unit; a plurality of beamforming (BF) modules each of which comprises at least a beamforming antenna and a transceiver circuit comprising at least a downconverter that downconverts a beamformed antenna radio frequency signal to an intermediate frequency signal, and an upconverter that upconverts an intermediate frequency signal to radio frequency and sends to said beamforming antenna for transmission; a plurality of intermediate frequency (IF) radios, each of which comprises a receive chain circuit that includes at least a downconverter that downconverts an intermediate frequency signal sent from said BF module to a basedband signal conveyed to said baseband processing unit, and a transmit chain circuit that includes at least an upconverter that upconverts a baseband signal received from said baseband processing unit to an intermediate frequency signal which is conveyed to said beamforming module; and a plurality of cables or any type of physical signal transmission medium, each of which connects one of said beamforming modules with one of said intermediate frequency radios.

A method of creating a dynamically sharp location based filter includes: placing a moving object containing two or more antennas used for direction finding of a radiation source within a anechoic testing chamber; moving one or more radio transmitters within the anechoic chamber relative to a future spatial location, angle, and/or position of the moving object over a defined time; record an expected angle of arrival of one or more signals of the one or more radio transmitters with respect to the future spatial location, angle, and/or position of the moving object over the defined time; and program a filter within the moving object based on the recorded expected angle of arrival of the one or more signals.

A system and method of improving data link performance between two or more wireless data transceivers includes: clipping and inverting the data components of a communication signal which are calculated to cause non-linear saturation effects in the downstream power amplifier; delaying a first time series to align the first time series with the clipped and inverted data components of a second time series; adding the clipped and inverted data components of the second time series to the delayed first time series to obtain a modified composite waveform; creating a sacrificial band containing principal energy of the clipped and inverted data components of the second time series; harvesting the principal energy of the sacrificial band to obtain an optimized composite waveform; and amplifying the optimized composite waveform with the downstream power amplifier of one or more of the two or more wireless data transceivers.

A method and apparatus is claimed here for reduced-complexity detection and estimation of geo-observables of global navigation satellite systems (GNSS) signals employing civil formats with repeating ranging codes, including true GNSS signals generated by satellite vehicles (SV's) or ground beacons (pseudo-lites), and malicious GNSS signals, e.g., spoofers and repeaters, using multi-subband symbol-rate synchronous channelization architectures that can exploit the full substantive bandwidth of the GNSS signals with managed complexity in each subband. Aspects employing spatial/polarization receivers are also claimed that can remove and geolocate non-GNSS jammers received by the system, as well as targeted GNSS spoofers that can otherwise emulate GNSS signals received at victim receivers. Aspects disclosed herein also provide time-to-first-fix (TTFF) over much smaller time intervals than existing GNSS methods; can operate in the presence of signals with much wider disparity in received power than existing techniques; and can operate in the presence of arbitrary multipath.