A gesture recognition system includes a Frequency modulated continuous waveform radar system. First and second channels of the signal reflected by the object are preprocessed and respectively sent to first and second feature map generators. A machine-learning accelerator is configured to receive output from the first and second feature map generators and form frames fed to a deep neural network realized with a hardware processor array for gesture recognition. A memory stores a compressed set of weights as fixed-point, low rank matrices that are directly treated as weights of the deep neural network during inference.

Non-transitory computer-readable mediums and systems are provided in which a portion of each chirp of a series of chirps is held at an offset frequency for a period of time, and in which the offset frequency, the period of time or both is varied or dithered across the chirps of the series of chirps. The portion of a chirp that is held at an offset frequency for a period of time may be a non-active portion of the chirp, during which the chirp is not sampled. In some implementations, the portion of a chirp that is held at an offset frequency for a period of time is during a falling portion of the chirp, which may be at the beginning of the falling portion, or at the end of the falling portion immediately before a rise portion of a succeeding chirp.

Techniques are provided for dynamic performance enhancement of radio frequency (RF) based systems. A system implementing the techniques according to an embodiment includes a waveform decoder configured to perform message decoding operations on a received RF signal waveform and to provide a decoding validation result for the message decoding operations. The system also includes a waveform attribute analyzer configured to analyze physical characteristics of the received RF signal waveform and to provide an attribute validation result for the physical characteristics. The system further includes a statistics analyzer configured to generate a statistic based on the decoding validation results and the attribute validation results and a thresholding system configured to generate anomaly detection based on a comparison of the generated statistic to a threshold value. In some embodiments, the RF signal waveform is an Identification Friend or Foe (IFF) transponder waveform or an IFF interrogator waveform.

Techniques are provided for dynamic performance enhancement of radio frequency (RF) based systems. A system implementing the techniques according to an embodiment includes a waveform decoder configured to perform message decoding operations on a received RF signal waveform and to provide a decoding validation result for the message decoding operations. The system also includes a waveform attribute analyzer configured to analyze physical characteristics of the received RF signal waveform and to provide an attribute validation result for the physical characteristics. The system further includes a statistics analyzer configured to generate a statistic based on the decoding validation results and the attribute validation results and a thresholding system configured to generate anomaly detection based on a comparison of the generated statistic to a threshold value. In some embodiments, the RF signal waveform is an Identification Friend or Foe (IFF) transponder waveform or an IFF interrogator waveform.

An apparatus for generating a signal with a non-tracker includes a video signal detecting unit detecting a video signal from a reception signal and outputting a video signal exceeding a threshold, an additional noise generating unit mixing the reception signal with additional noise and outputting the reception signal mixed with the additional noise, a stored signal processing unit storing and outputting the reception signal mixed with the additional noise when the video signal exceeding the threshold is input, and a transmission signal gain controller combining a first signal, which is the reception signal mixed with the additional noise transmitted from the additional noise generating unit, and a second signal stored in and output from the stored signal processing unit, and outputting a combined signal.

An apparatus for generating a signal with a non-tracker includes a video signal detecting unit detecting a video signal from a reception signal and outputting a video signal exceeding a threshold, an additional noise generating unit mixing the reception signal with additional noise and outputting the reception signal mixed with the additional noise, a stored signal processing unit storing and outputting the reception signal mixed with the additional noise when the video signal exceeding the threshold is input, and a transmission signal gain controller combining a first signal, which is the reception signal mixed with the additional noise transmitted from the additional noise generating unit, and a second signal stored in and output from the stored signal processing unit, and outputting a combined signal.

Disclosed are a device and method for detecting distance reduction attack in an ultra-wide band (UWB) high rate pulse (HRP) mode. The method for detecting distance reduction attack is a method performed by a receiver or transmitter operating in the UWB HRP mode, the method comprising receiving a message frame targeted for distance reduction attack; splitting a scrambled timestamp sequence (STS) field included in the message frame into a plurality of sub-fields; computing a correlation between each of the sub-fields and a corresponding sub-template among a plurality of sub-templates split from a local template; extracting a plurality of maximum peaks, each corresponding to each of the correlations; and detecting the distance reduction attack based on extracted maximum peaks.

An anti-interference microwave detection method and microwave detection device, wherein the anti-interference microwave detection method can accurately eliminate the interference signal in the environment that have any frequency relationship with the local oscillator signal of the microwave detection device, including same frequency, adjacent frequency, and harmonic frequency, so that it is conducive to improve the feedback accuracy of the Doppler intermediate frequency signal for the detection of the motion of objects in the corresponding detection space, so that it is beneficial for achieving the combined detection of motion characteristics including human movement, micro-movement, breath and hear beat, the detection function of the microwave detection device is diversified and suitable for intelligent detection applications of multifunctional requirements.

A system that is capable of detecting a Man in the Middle attack is disclosed. The system includes a receive circuit for receiving incoming packets. The system also includes a digitized model of at least part of the receive circuit and optionally part of the transmit circuit. The system compares the output from the digitized model with the output from the read circuit to determine the likelihood of a Man in the Middle Attack. In certain embodiments, the digitized model is a finite impulse response filter with multiple taps. The system correctly identifies Man in the Middle attacks more than 90% of the time when the signal to noise ratio is greater than 20 dB.

A secure wireless transceiver, such as a link 16 transceiver, receives signals using an antenna array having an SOC associated with each antenna element in the array. The SOC's digitize and channelize received data for transmission to a message nulling system that mitigates jamming. The antenna array can be conformal, and can replace an existing Link 16 blade. The disclosed transceiver can be a modified CMN-4 transceiver with digitizing and channelizing moved to the SoC's, and replaced by the nulling system. The transceiver uses applicable TRANSEC information to assign received data to the logical Link 16 channels before nulling, and embodiments apply nulling only to channels of interest, thereby improving the nulling and reducing side lobes. Embodiments distinguish between desired and unwanted signals based on known Link 16 signal features and/or situational awareness, rather than signal amplitudes, thereby enabling nulling of even weak jamming signals.