Wireless communication systems and methods are provided that include at least one base transmitter unit, at least one repeater unit, at least one receiver, and an artificial intelligence unit. The base transmitter unit is configured to transmit a data signal. The repeater unit is in communication with the transmitter and is configured to transmit the data signal via sky wave propagation. The receiver is in communication with the transmitter and the repeater and is configured to receive the data signal. The artificial intelligence unit monitors ionospheric conditions in the area and controls the data signal, making adjustments so the data signal overcomes skip zones. The adjustments may include automatically adjusting the power and position of the antenna array to re-route the data signal and/or dynamically changing the frequency of the data signal.

A receiver includes a circuit designed to process, based on a plurality of timed waveform reference locations, a waveform signal, the waveform signal comprising a message. The circuit may include a clock source, an input configured to receive the waveform signal, a time location reference circuit coupled to the clock source, the time location reference circuit designed to output the plurality of timed waveform reference locations, each timed waveform reference location being set by the clock, and a signal processing circuit coupled to the time location reference circuit, the signal processing circuit designed to generate an output voltage in a response to the waveform signal being inputted into the signal processing circuit through the input and processed at each timed waveform reference location from the series of timed waveform reference locations. A transmitter that generates the waveform signal can be also provided where the clocks are matched.

A multiband sensing system includes an active multiband sensing unit configured to transmit a radio frequency (RF) signal in multiple bands and communicate with a network. The active multiband sensing unit includes at least one transmitting antenna configured to transmit the RF signal. The multiband sensing system includes a passive multiband sensing unit including at least one receiving antenna configured to receive the RF signal, an acoustic actuator powered by the received RF signal including an actuating sensor element configured to actuate in response to receiving extracted modulated information of the RF signal, and an acoustic detector. The acoustic detector includes a detector transmitting antenna configured to backscatter a new frequency band signal to the active multiband sensing unit and a detector sensor element configured to sense data. The sensed data is modulated over the received RF signal to produce the new frequency band signal.

A multiband sensing system includes an active multiband sensing unit configured to transmit a radio frequency (RF) signal in multiple bands and communicate with a network. The active multiband sensing unit includes at least one transmitting antenna configured to transmit the RF signal. The multiband sensing system includes a passive multiband sensing unit including at least one receiving antenna configured to receive the RF signal, an acoustic actuator powered by the received RF signal including an actuating sensor element configured to actuate in response to receiving extracted modulated information of the RF signal, and an acoustic detector. The acoustic detector includes a detector transmitting antenna configured to backscatter a new frequency band signal to the active multiband sensing unit and a detector sensor element configured to sense data. The sensed data is modulated over the received RF signal to produce the new frequency band signal.

Cellular communications, such as 5G cellular, may be a primary link between cell phones and a base station. Such cellular communications may be desirable, due to a high link rate. When the cellular communications are denied, a tactical waveform may be used to bridge communications between the cell phones and the base station. The tactical waveform may be transmitted between tactical radios coupled with the cell phones. The waveform may include a line-of-sight waveform. The tactical waveform may also include a beyond-line-of-sight waveform.

A system or method for generating GNSS corrections can include receiving satellite observations associated with a set of satellites at a reference station, determining atmospheric corrections valid within a geographical area; wherein geographical areas associated with different atmospheric corrections can be overlapping, and wherein the atmospheric corrections can be provided to a GNSS receiver when the locality of the GNSS receiver is within a transmission region of the geographical area.

An apparatus and method to transmit and receive messages within and near the noise floor by pulsed signals that are time synchronized and are not easily intercepted by use of frequency and time slots as well as intermittent transmissions.

A communication system transmits data between communication nodes over a data transmission path. The system collects data from at least two different sources to create a fused data stream that is used as the input to a model for determining a frequency at which to transmit the data by skywave propagation. The data is transmitted between the communication nodes at the frequency determined by the model.

A communication system transmits data between communication nodes over a data transmission path. The system collects data from at least two different sources to create a fused data stream that is used as the input to a model for determining a frequency at which to transmit the data by skywave propagation. The data is transmitted between the communication nodes at the frequency determined by the model.

Backscatter tags, comprising: antennas; single pole, multiple throw switches each switch (S) having pole terminal connected to one of the antennas, and each having first throw terminal (TT) connected to first side (FS) of inductor (I) for S, second TT connected to FS of capacitor (C) for S, third TT connected to fixed voltage level (FVL), fourth TT that is floating, wherein second side (SS) of I and SS of C are connected to the FVL; power combiner (PC) having inputs connected to fifth TT of each of two of the switches; power detector (PD) having an input connected to output of PC; analog to digital converter (ADC) having input connected to output of PD; hardware processor coupled to output of the ADC and coupled to control terminal of each of the switches.