Abstract: Systems and methods for positioning and navigating objects using phase-synchronized nonlinear oscillators are disclosed. The system includes oscillators to operate in a limit-cycle oscillatory mode. The system further includes pulse-emitting source for emitting periodic pulse sequence signal. The system further includes a processing unit to phase-lock each of oscillators to the periodic pulse sequence signal. The processing unit further extracts fundamental harmonic frequency from outputs of oscillators using bandpass filter. The processing unit further determines phase difference between outputs of oscillators based on fundamental harmonic frequency. The processing unit further computes differential time delay between oscillators based on phase difference. The processing unit further determines position of pulse-emitting source by converting time delays into relative spatial distance using predefined propagation velocity of periodic pulse sequence signal.

Abstract: A system and method to detect airborne intrusions using a plurality of downlink signals from low Earth orbit (LEO) satellites is disclosed. The system includes an antenna, a signal processing unit, and a user. Further, the antenna captures a plurality of signals from at least one satellite within a predefined frequency band. The plurality of signals comprises downlink signals. The at least one satellite comprises a Low Earth Orbit (LEO) satellite. Further, the signal processing unit extracts a plurality of reference beacon tones from the captured plurality of signals by identifying frequency characteristics and modulation characteristics of the plurality of signals. Furthermore, the signal processing unit establishes at least one baseline reference signal for the captured plurality of signals using the extracted plurality of reference beacon tones.

Abstract: A voltage monitoring system and a method for harvesting energy is disclosed. A system includes a ring oscillator circuit, which incorporates delay line circuit composed of series of inverting logic gates. The final inverting logic gate forms self-oscillating feedback loop by connecting its output to the input of the first logic gate. To interface with ring oscillator circuit, transistor-based voltage divider circuit is implemented. The transistor-based voltage divider circuit utilizes multiple diode-connected transistor devices, with bulk terminals interconnected to the respective source terminals. Enable signal controls final diode-connected transistor device at its gate terminal. Furthermore, a voltage-level shifter circuit is connected to output of inverting logic gates, enabling seamless integration with ring oscillator circuit. Finally, a counter circuit is linked to voltage-level shifter circuit, utilizing its output terminal.