Provided are a direct wave suppression method and system for a microwave imaging system. The method includes a series of filtering operations, such as conversion from a frequency domain to a time domain, filtering, conversion from the time domain to the frequency domain, and cancellation subtraction, on an echo signal set composed of echo signals obtained by a vertical linear array antenna at all the equivalent antenna collection positions thereof.

This invention describes a Spatial Intelligence System that provide radio positioning/navigation with additional spatial data in support of automation, machine learning and inference-based systems. More specifically and in particular, the present invention, is such a radio positioning/navigation system that integrates, correlates with or obviates the need of the global navigation satellite systems (GNSS) with a Pulsed Wireless Location System (PWLS) to provide positioning/navigation/timing data either within a line-of-sight barrier using an ad-hoc coordinate system, a direct line of sight of GNSS beacon geographic coordinate system or a ad-hoc translation to geographic coordinate system. The system generically offers the ability to use a low cost tag or location device with anchor processing or a higher cost, higher capability tag or location device with local processing simultaneously.

The present invention relates to an ultra-wide band (UWB) ranging device and a UWB ranging method using the same. The UWB ranging device includes a memory in which a program for UWB ranging is stored, and a processor configured to execute the program, wherein the UWB ranging device performs the UWB ranging by transmitting an integrated packet that includes a Scrambled Timestamp Sequence (STS) and a payload.

This document includes techniques, apparatuses, and systems related to a waveguide with squint alteration, which can improve electromagnetic wave operation. In aspects, squint of electromagnetic waves pertaining to waveguides may be altered and improved. In this example, the techniques also enable the waveguide to direct electromagnetic waves according to respective chambers and one or more apertures, improving the quality of signals transmitted and received. The chambers may be divided according to a divider extending toward an opening of the waveguide, directing electromagnetic waves between the opening and the one or more apertures.

A feature detection system, the system comprising: at least one processor in operative communication with a signal source, said processor further comprising at least one non-transitory storage medium, wherein at least one non-transitory storage medium contains instructions configured to cause the processor to: apply a joint group sparse denoising and delay estimation approach to a signal received from said signal source; and output statistics regarding the signal, wherein the joint group sparse denoising and delay estimation approach comprises; using the following equation:

[00001]$\left\{x^{*},{\tau }^{*}\right\}=\underset{x,\tau }{\mathrm{argmin}}\left\{\frac{1}{2}\underset{j=1}{\overset{M}{.Math.}}{.Math.y_j-x.Math.}_2^2+\underset{i=0}{\overset{N}{.Math.}}{\lambda }_i{\phi }_i\left(D_i^{l_i}x\right)\right\}$

where: ϕ.sub.i are regularization functions; ∥y−x∥.sub.2.sup.2 is a data-fidelity term and, in embodiments, is chosen as the least-square term; l.sub.i are real numbers; D.sub.i are operators, which may be linear filters that can be written in matrix form; λ.sub.i are regularization parameters; and x*,τ* represent estimates of at least one transmitted pulse and associated delay, and solving the equation for multiple values of ϵ; choosing a vector, x, such that a cost function comprising the data fidelity term and regularization function is minimized; determining the ϵ that corresponds to the x that minimizes the cost function; and calculating the pulse width of the received signal, which corresponds to the desired estimate of the vector, x.

In summary, the present invention thus relates to a method of determining a level of a product in a tank, comprising generating and transmitting an electromagnetic transmit signal; guiding the transmit signal towards and into the product; returning an electromagnetic reflection signal resulting from reflection of the transmit signal; receiving, the reflection signal; determining, based on the reflection signal and a timing relation between the reflection signal and the transmit signal, an echo signal exhibiting an echo signal strength as a function of a propagation parameter indicative of position along the probe; and determining the level of the surface of the product based on a propagation parameter value indicative of a first threshold position along the probe for which the echo signal has reached a predetermined threshold signal strength, and an offset indicative of an offset distance along the probe from the first threshold position towards the second probe end.

A light wave distance meter according to the present invention includes: a light-emitting element that emits a distance measurement light; a light-receiving element that outputs a light-receiving signal; a frequency conversion unit that includes a bandpass filter; an arithmetic control unit that computes a distance value to a measurement object; a signal generator that generates a signal having a predetermined frequency; a waveform conversion unit that generates a waveform conversion signal; pulse generators that generate pulse signals by pulsating the signal having a predetermined frequency so as to have a waveform profile of a signal constituted of desired frequency components on the basis of the signal output from the signal generator and the waveform conversion signal output from the waveform conversion unit; and a drive unit that emits the distance measurement light based on the pulse signals.

Systems, methods, and computer-readable media are described for compact radar systems. In some examples, a compact radar system can include a first set of transmit antennas, a second set of receive antennas, one or more processors, and at least one computer-readable storage medium storing computer-executable instructions which, when executed by the one or more processors, cause the radar system to coordinate digital beam steering of the first set of transmit antennas and the second set of receive antennas, and coordinate digital beam forming with one or more of the second set of receive antennas to detect one or more objects within a distance of the radar system.

A full duplex dual polar radar transceiver comprising a dual polarisation radar antenna, a transmission path, a horizontal polarisation receive path, and a vertical polarisation receive path, a first cancellation path connected between the transmission path and the vertical polarisation receive path, and a second cancellation path connected between the transmission path and the horizontal polarisation receive path. Each cancellation path is configured to vary a transmission signal provided by the transmission path by varying at least one of a phase shift, a delay, or an amplitude so as to cancel self-interference on each of the vertical and horizontal polarisation receive paths.

A plurality of transmission antennas include Nt1 transmission antennas arranged in a first direction and Nt2 transmission antennas arranged in a second direction orthogonal to the first direction, a plurality of reception antennas include Na1 reception antennas arranged in the first direction and Na2 reception antennas arranged in the second direction. In the first direction, an inter-element space between any two of the Nt1 transmission antennas and an inter-element space between any two of the Na1 reception antennas are each a value which is a product of a first space and an integer and are all values different from each other, and in the second direction, an inter-element space between any two of the Nt2 transmission antennas and an inter-element space between any two of the Na2 reception antennas are each a value which is a product of a second space and an integer and are all values different from each other.