A radar sensing system includes at least one transmitter, at least one receiver and a processor. The at least one transmitter transmits a power shaped RF signal. The transmitted RF signal decreases in power over time. The at least one receiver receives a reflected RF signal. The reflected RF signal is the transmitted RF signal reflected from targets in the environment. The reflected RF signal is down-converted and the result provided to the processor. The processor samples the down-converted reflected RF signal during a plurality of time intervals to produce a sampled stream. The different time intervals of the plurality of time intervals will contain different signal levels of RF signals reflected from the targets. The processor also selects samples in the sampled stream over a selected time interval of the plurality of time intervals that is free of RF signals reflected off of near targets.

A radar sensing system includes at least one transmitter, at least one receiver and a processor. The at least one transmitter transmits a power shaped RF signal. The transmitted RF signal decreases in power over time. The at least one receiver receives a reflected RF signal. The reflected RF signal is the transmitted RF signal reflected from targets in the environment. The reflected RF signal is down-converted and the result provided to the processor. The processor samples the down-converted reflected RF signal during a plurality of time intervals to produce a sampled stream. The different time intervals of the plurality of time intervals will contain different signal levels of RF signals reflected from the targets. The processor also selects samples in the sampled stream over a selected time interval of the plurality of time intervals that is free of RF signals reflected off of near targets.

Systems, methods, and devices relating to radar and radar-based applications. A number of comparators are coupled in parallel with each comparator comparing an incoming signal and a predetermined value. If the predetermined value is exceeded by the incoming signal, the comparator output is set to trigger a flip flop. The predetermined value changes with each comparator and, with the signal being the radar reflection from a radar pulse, this allows for the detection of the peak value of the incoming signal. The circuit may be extended so that the output of the comparator which is triggered by the highest peak from the incoming signal is latched. Other variants include being able to count the clock cycles before the highest peak is detected within the range cell.

According to an embodiment, positioning system includes transmitter apparatus transmits radio wave and receiver apparatus receives target echo. Transmitter apparatus comprises first receiver and transmitter. First receiver receives GPS signal and outputs reference signal. Transmitter transmits radio wave at time interval based on reference signal. The receiver apparatus includes second receiver, detector and first and second calculators. Second receiver receives GPS signal and outputs time information. Detector receives target echo and outputs reception signal added received time information. First calculator calculates Doppler frequency based on reception frequency and transmission frequency. Second calculator calculates time difference of echo based on Doppler frequency. Detector sets time filter to receive next pulse based on time difference and time information of reception signal.

According to an embodiment, positioning system includes transmitter apparatus transmits radio wave and receiver apparatus receives target echo. Transmitter apparatus comprises first receiver and transmitter. First receiver receives GPS signal and outputs reference signal. Transmitter transmits radio wave at time interval based on reference signal. The receiver apparatus includes second receiver, detector and first and second calculators. Second receiver receives GPS signal and outputs time information. Detector receives target echo and outputs reception signal added received time information. First calculator calculates Doppler frequency based on reception frequency and transmission frequency. Second calculator calculates time difference of echo based on Doppler frequency. Detector sets time filter to receive next pulse based on time difference and time information of reception signal.

A radar signal transmitter transmits first and second radar signals at different first and second frequencies. A radar receiver receives reflected radar signals and generates receive signals indicative of the reflected radar signals. A first receive signal is indicative of a first reflected radar signal generated by reflection of the first transmitted radar signal, and a second receive signal is indicative of a second reflected radar signal generated by reflection of the second transmitted radar signal. A processor receives the first and second receive signals and computes a difference between the first and second receive signals to generate a difference signal. The processor processes the difference signal to provide radar information for the region, the processor adjusting at least one of amplitude and phase of at least one of the first and second receive signals such that the difference is optimized at a preselected range from the receiver.

Systems, methods, and non-transitory computer-readable media provide an adaptive gating mechanism for radar tracking initialization. Specifically, the radar system obtains measurement data of target points, and then determines, based on the measured position and dopplers of points in the first few scans, whether the doppler and displacement parameters satisfy an initialization constraint. When the initialization constraint is not satisfied, the radar system flags the respective cluster with an initialization flag, and adaptively uses the measured position and doppler of scanned points to determine the gating size for the next scan, instead of using a fixed gate size. When the initialization flag of the same cluster across a few consecutive scans satisfies a combination logic, the radar system determines that the tracking enters into the association stage, e.g., the radar system formally generates a track for the target points along a series of scans.

Techniques for automatic adaptive scanning with a laser scanner include obtaining range measurements at a coarse angular resolution and forming a horizontally sorted range gate subset and a characteristic range. A fine angular resolution is determined automatically based on the characteristic range and a target spatial resolution. If the fine angular resolution is finer than the coarse angular resolution, then a minimum and maximum vertical angle is automatically determined in each horizontal slice extending a bin size from any previous horizontal slice. A set of adaptive minimum and maximum vertical angles is determined automatically by dilating and interpolating the minimum and maximum vertical angles of all the slices to the second horizontal angular resolution. A horizontal start angle, and the set of adaptive minimum and maximum vertical angles are sent to cause the ranging system to obtain measurements at the second angular resolution.

Techniques for automatic adaptive scanning with a laser scanner include obtaining range measurements at a coarse angular resolution and forming a horizontally sorted range gate subset and a characteristic range. A fine angular resolution is determined automatically based on the characteristic range and a target spatial resolution. If the fine angular resolution is finer than the coarse angular resolution, then a minimum and maximum vertical angle is automatically determined in each horizontal slice extending a bin size from any previous horizontal slice. A set of adaptive minimum and maximum vertical angles is determined automatically by dilating and interpolating the minimum and maximum vertical angles of all the slices to the second horizontal angular resolution. A horizontal start angle, and the set of adaptive minimum and maximum vertical angles are sent to cause the ranging system to obtain measurements at the second angular resolution.

Embodiments are generally directed to determination of mobile display position and orientation using micropower impulse radar. An embodiment of an apparatus includes a display to present images; radar components to generate radar signal pulses and to generate distance data based on received return signals; radar antennae to transmit the radar signal pulses and to receive the return signals; and a processor to process signals and data, wherein the processor is to: process the return signals received by the radar antennae to determine a position and orientation of the display with respect to real objects in an environment and to determine a position of a vantage point of a user of the apparatus, and generate an augmented image including rendering a virtual object and superimposing the virtual object on an image including one or more real objects, the rendering of the virtual image being based at least in part on the determined position and orientation of the display and the determined vantage point of the user of the apparatus.