An antenna includes a plurality of waveguide antenna elements arranged in a first array configured to operate with a first polarization. The antenna also includes a plurality of waveguide output ports arranged in a second array configured to operate with a second polarization. The second polarization is different from the first polarization. The antenna further includes a polarization-modification layer with channels defined therein. The polarization-modification layer is disposed between the waveguide antenna elements and the waveguide output ports. The channels are oriented at a first angle with respect to the waveguide antenna elements and at a second angle with respect to the waveguide output ports. The channels are configured to receive input electromagnetic waves having the first polarization and transmit output electromagnetic waves having a first intermediate polarization. The waveguide output ports are configured to receive input electromagnetic waves and radiate electromagnetic waves having the second polarization.

A Simultaneous Transmit and Receive (STaR) system utilizing high power transmitters and high sensitivity receivers in conjunction with one or more signal polarizers to maintain far-field polarization efficiency for both transmission and reception of same (or similar) frequency content at the same time. This STaR system maintains far-field polarization efficiency to remote target(s) while simultaneously introducing a near-field polarization mismatch between the transmission and receiver subsystems for higher isolation and reduced coupling.

Examples relate to near-field radar filters that can enhance measurements near a radar unit. An example may involve receiving a first set of radar reflection signals at a radar unit coupled to a vehicle and determining a filter configured to offset near-field effects of radar reflection signals received at the radar unit. In some instances, the filter depends on an azimuth angle and a distance for surfaces in the environment causing the first set of radar reflection signals. The example may also involve receiving, at the radar unit, a second set of radar reflection signals and determining, using the filter, an azimuth angle and a distance for surfaces in the environment causing the second set of radar reflection signals. The vehicle may be controlled based in part on the azimuth angle and the distance for the surfaces causing the second plurality of radar reflection signals.

A system comprising a hemispherical array antenna having a plurality of antenna elements comprising a set of baseline antenna elements arranged in a first 360 circular antenna array, a set of upper antenna elements arranged in a second 360 circular antenna array and latitudinally aligned with the baseline antenna elements, and a set of lower antenna elements arranged in a third 360 circular antenna array and latitudinally aligned with the baseline antenna elements. The system includes a fleet base station including a plurality of non-shared receiver channels coupled to and dedicated to a particular antenna element. The base station is configured to provide 360 of transmission/reception from horizon to zenith using the antenna elements for command and control fleet communications to and from mobile devices and to provide secondary radar functions using the fleet communications to track the mobile devices based on received signal characteristics received at the antenna elements.

A radar signal processing method and an apparatus, and a storage medium that are applied to a first radar. The method includes: determining that a polarization direction of the first radar is a first angle, where the first radar is located at a first vehicle; and transmitting a radar signal based on the polarization direction of the first radar, where a detection direction of the first radar is opposite to a detection direction of a second radar located at the first vehicle, and a polarization direction of the second radar is a second angle; and the first angle and the second angle are orthogonal.

Examples relate to near-field radar filters that can enhance measurements near a radar unit. An example may involve receiving a first set of radar reflection signals at a radar unit coupled to a vehicle and determining a filter configured to offset near-field effects of radar reflection signals received at the radar unit. In some instances, the filter depends on an azimuth angle and a distance for surfaces in the environment causing the first set of radar reflection signals. The example may also involve receiving, at the radar unit, a second set of radar reflection signals and determining, using the filter, an azimuth angle and a distance for surfaces in the environment causing the second set of radar reflection signals. The vehicle may be controlled based in part on the azimuth angle and the distance for the surfaces causing the second plurality of radar reflection signals.

An antenna includes a plurality of waveguide antenna elements arranged in a first array configured to operate with a first polarization. The antenna also includes a plurality of waveguide output ports arranged in a second array configured to operate with a second polarization. The second polarization is different from the first polarization. The antenna further includes a polarization-modification layer with channels defined therein. The polarization-modification layer is disposed between the waveguide antenna elements and the waveguide output ports. The channels are oriented at a first angle with respect to the waveguide antenna elements and at a second angle with respect to the waveguide output ports. The channels are configured to receive input electromagnetic waves having the first polarization and transmit output electromagnetic waves having a first intermediate polarization. The waveguide output ports are configured to receive input electromagnetic waves and radiate electromagnetic waves having the second polarization.

Disclosed is an intelligent vehicle-mounted radar device for reducing signal interference, wherein, the antenna module includes a dual-polarized antenna, namely, any polarized signal can be measured, and polarization information can be processed and extracted in real time by the polarization digital processor module, the present invention is featured by rapid and real-time. In addition, when the local oscillation module is turned on, the first rectifier diode, the first switch module, the first resistor, the second resistor and the second rectifier diode make the current flowing through the local oscillation module rise gradually to suppress signal interference, and thus improve the performance of the intelligent vehicle-mounted radar device.

An antenna includes a plurality of waveguide antenna elements arranged in a first array configured to operate with a first polarization. The antenna also includes a plurality of waveguide output ports arranged in a second array configured to operate with a second polarization. The second polarization is different from the first polarization. The antenna further includes a polarization-modification layer with channels defined therein. The polarization-modification layer is disposed between the waveguide antenna elements and the waveguide output ports. The channels are oriented at a first angle with respect to the waveguide antenna elements and at a second angle with respect to the waveguide output ports. The channels are configured to receive input electromagnetic waves having the first polarization and transmit output electromagnetic waves having a first intermediate polarization. The waveguide output ports are configured to receive input electromagnetic waves and radiate electromagnetic waves having the second polarization.

Methods for acquiring information regarding terrain and/or objects within a target volume using wireless networks (spatial imaging), providing an estimate of local signal reflectivity within the target volume (local estimated signal), some of which comprise: receiving signals transmitted by one or more nodes of wireless networks using one or more receiving units (node signal receivers (30)), wherein the transmitted signals are node signals (20) and the signals received after traversing a medium (21) are node resultant signals (22), and wherein each of the one or more node signal receivers (30) is configured to receive signals associated with one or more transmitting nodes of wireless networks (transmitting subject network nodes (11)); and for at least one of the one or more node signal receivers (30), for at least one of the associated one or more transmitting subject network nodes (11), generating an initial version of the local estimated signal (bi-static local estimated signal), using the following processing steps: (a) apply matched filtering between the node resultant signal received by the current node signal receiver and the waveform of the current transmitting subject network node, wherein the output of the matched filtering (matched node resultant signal) is provided as a function of time, wherein time is correlated to a bi-static range with respect to the current node signal receiver and the current transmitting subject network node; (b) for one or more spatial locations within the target volume (60), compute the bi-static range with respect to the current node signal receiver and the current transmitting subject network node (bi-static distance), wherein the spatial location of each of the current node signal receiver and the current transmitting subject network node is known, measured, or estimated; and (c) for each of the one or more spatial locations within the target volume (60), determine the bi-static local estimated signal based on the value of the matched node resultant signal at the bi-static distance corresponding to the current spatial location.