Device, system, and method of aircraft protection and countermeasures against threats. A system for protecting an aircraft against a threat, includes a dual frequency Radio Frequency (RF) module, which includes: a dual-band RF transmitter and a dual-band RF receiver, to transmit and receive high-band RF signals and low-band RF signals; and a threat confirmation and tracking module, to confirm and track a possible incoming threat based on processing of high-band RF signals and low-band RF signals received by the dual-band RF receiver. The system further includes a dual frequency band antenna, to transmit and receive the high-band RF signals and the low-band RF signals. The system also includes a directed high-power laser transmitter, to activate a directed high-power laser beam as countermeasure towards a precise angular position of a confirmed threat.

An electro-optical distance measurement method includes: a light emitting step of switchably outputting a first distance measuring light and a second distance measuring light; a photodetection step of receiving a first reflected distance measuring light and a second reflected distance measuring light; an arithmetic step of frequency-converting a photodetection signal to generate a first difference frequency signal and a second difference frequency signal; and a determining step of determining whether identification information indicating a host device is included in the photodetection signal, wherein the light emitting step involves driving a light emitting element so that the identification information is included in a light emission signal, and the arithmetic step involves calculating the distance value when it is determined in the determining step that the identification information is included in the photodetection signal.

An active sensing system includes an agent and at least one sensor operatively associated with the agent. The at least one sensor includes one or more emitters configured and disposed to establish a sensing zone. A conflict identification module is configured and disposed to identify one or more sensor conflict regions, and an active sensor controller is operatively connected to the at least one sensor and the conflict identification module. The active sensor controller is configured and disposed to form an adjustment zone within the sensing zone to accommodate the one or more sensor conflict regions.

An active sensing system includes an agent and at least one sensor operatively associated with the agent. The at least one sensor includes one or more emitters configured and disposed to establish a sensing zone. A conflict identification module is configured and disposed to identify one or more sensor conflict regions, and an active sensor controller is operatively connected to the at least one sensor and the conflict identification module. The active sensor controller is configured and disposed to form an adjustment zone within the sensing zone to accommodate the one or more sensor conflict regions.

A system for jamming a target acquisition, which starts at a position and may be detected by a detector that provides a detection signal in response to the target acquisition includes a warning device for outputting a warning, in case the detector outputs a detection signal. The system also includes an optical jammer configured to provide at least one jamming signal, and a directing device configured to direct the jamming signal towards the position in response to the output warning in order to prevent target acquisition or at least to make target acquisition more difficult.

A system for jamming a target acquisition, which starts at a position and may be detected by a detector that provides a detection signal in response to the target acquisition includes a warning device for outputting a warning, in case the detector outputs a detection signal. The system also includes an optical jammer configured to provide at least one jamming signal, and a directing device configured to direct the jamming signal towards the position in response to the output warning in order to prevent target acquisition or at least to make target acquisition more difficult.

Aspects of the present disclosure involve systems, methods, and devices for mitigating Lidar cross-talk. Consistent with some embodiments, a method includes detecting a noise signal producing noise in one or more return signals being received by a Lidar unit of an autonomous vehicle (AV) system, and detecting a noise source corresponding to the noise signal. The detecting of the noise source comprises determining a direction of the noise source relative to the AV system and determining a classification of the noise source based on an intensity of the noise signal. The method further includes generating state data to describe the noise source based on the direction of the noise source relative to AV system and the classification of the noise source. The method further includes controlling one or more operations of the AV system based on the state data describing the noise source.

Aspects of the present disclosure involve systems, methods, and devices for mitigating Lidar cross-talk. Consistent with some embodiments, a method includes detecting a noise signal producing noise in one or more return signals being received by a Lidar unit of an autonomous vehicle (AV) system, and detecting a noise source corresponding to the noise signal. The detecting of the noise source comprises determining a direction of the noise source relative to the AV system and determining a classification of the noise source based on an intensity of the noise signal. The method further includes generating state data to describe the noise source based on the direction of the noise source relative to AV system and the classification of the noise source. The method further includes controlling one or more operations of the AV system based on the state data describing the noise source.

Aspects of the present disclosure involve systems, methods, and devices for mitigating Lidar cross-talk. Consistent with some embodiments, a Lidar system is configured to include one or more noise source detectors that detect noise signals that may produce noise in return signals received at the Lidar system. A noise source detector comprises a light sensor to receive a noise signal produced by a noise source and a timing circuit to provide a timing signal indicative of a direction of the noise source relative to an autonomous vehicle on which the Lidar system is mounted. A noise source may be an external Lidar system or a surface in the surrounding environment that is reflecting light signals such as those emitted by an external Lidar system.

It is proposed to make a threat better visible for a defensive measure. In this context, the threat (2) should be imaged more intensely for the defensive measure. For the purposes of more effective imaging, provision is made for the threat to emit a stronger IR signature and thus be able to stand out sufficiently against the background for the defensive measure. The stronger IR signature is caused by heating a surface of the threat, which is realized by a laser weapons system. The defensive measure can better detect this heating and has an IR seeker head to this end.