A control method for a LiDAR. The method comprises: transmitting a multi-pulse sequence with a time interval encoding; receiving LiDAR echoes to determine whether the LiDAR echoes include a valid echo pulse sequence corresponding to the multi-pulse sequence; when the LiDAR echoes includes the valid echo pulse sequence corresponding to the multi-pulse sequence, determining whether the valid echo pulse sequence is interfered with according to a pulse characteristic of the valid echo pulse sequence; and when the valid echo pulse sequence is interfered with, adjusting the time interval encoding at a next transmission according to a distribution of an interference signal in the LiDAR echoes. The setting of the time interval encoding is adjusted at the next transmission according to the distribution of the interference signal in the LiDAR echoes. The pulse characteristic includes pulse intensities and pulse widths.

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 photonic waveguide for conducting light having first and second wavelengths, the waveguide comprising superposed first and second strips of light conducting semiconductor materials having first and second refractive indexes, wherein the second wavelength is shorter than the first wavelength and the second refractive index is higher than the first refractive index, wherein the width and height of the first strip of light conducting semiconductor material are such that the first strip of light conducting semiconductor material is adapted to confine an optical mode of the first wavelength and the width and height of the second strip of light conducting semiconductor material are such that the second strip of light conducting semiconductor material is adapted to confine an optical mode of the second wavelength but is too narrow to confine an optical mode of the first wavelength.

A photonic waveguide for conducting light having first and second wavelengths, the waveguide comprising superposed first and second strips of light conducting semiconductor materials having first and second refractive indexes, wherein the second wavelength is shorter than the first wavelength and the second refractive index is higher than the first refractive index, wherein the width and height of the first strip of light conducting semiconductor material are such that the first strip of light conducting semiconductor material is adapted to confine an optical mode of the first wavelength and the width and height of the second strip of light conducting semiconductor material are such that the second strip of light conducting semiconductor material is adapted to confine an optical mode of the second wavelength but is too narrow to confine an optical mode of the first wavelength.

Described herein are systems and methods for improving detection of a return signal in a light ranging and detection system. The system comprises a transmitter and a receiver. A first sequence of pulses may be encoded with an anti-spoof signature and transmitted in a laser beam. A return signal, comprising a second sequence of pulses, may be received by the receiver and the anti-spoof signature extracted from the second sequence of pulses. If based on the extraction, the first and second sequences of pulses match, the receiver outputs return signal data. If based on the extraction, the first and second sequence of pulses do not match, the return signal is disregarded. The system may dynamically change the anti-spoofing signature for subsequent sequences of pulses. Additionally, the first sequence of pulses may be randomized relative to a prior sequence of pulses.

An anti-interference ranging method and an anti-interference ranging apparatus are provided. The method includes: detecting, by a first light detection and ranging device, whether a light detection process is interfered by a second light detection and ranging device in the ranging system; delaying, by the first light detection and ranging device, the light detection process for a preset time period if it is detected that the light detection process is interfered by the second light detection and ranging device; and acquiring, by the first light detection and ranging device, detection data collected in the light detection process, and processing, by the first light detection and ranging device, the detection data to obtain a ranging result if it is detected that the light detection process is not interfered by the second light detection and ranging device.

An anti-interference ranging method and an anti-interference ranging apparatus are provided. The method includes: detecting, by a first light detection and ranging device, whether a light detection process is interfered by a second light detection and ranging device in the ranging system; delaying, by the first light detection and ranging device, the light detection process for a preset time period if it is detected that the light detection process is interfered by the second light detection and ranging device; and acquiring, by the first light detection and ranging device, detection data collected in the light detection process, and processing, by the first light detection and ranging device, the detection data to obtain a ranging result if it is detected that the light detection process is not interfered by the second light detection and ranging device.

This disclosure provides methods and apparatuses relating to LiDAR. In an example method: transmitting a detection pulse to the outside of the LiDAR, wherein an intensity of the detection pulse is adjustable, switching a bias voltage of a receiver of the LiDAR from a first bias voltage to output a second bias voltage based on a time of transmission of the detection pulse, wherein a detection performance of the receiver is lower at the first bias voltage than at the second bias voltage, receiving an echo of the detection pulse reflected from an obstacle, and converting the echo into an electrical signal by the receiver device.

Systems, methods, and computer-readable media are disclosed for a systems and methods for pre-blinding light detectors. An example method may include sending, by a processor of a LIDAR system and at a first time, a signal to a light source of the LIDAR system, the signal causing the light source to provide a light input to a photodetector of the LIDAR system, wherein the light input to the photodetector causes the photodetector to initiate a recovery period. The example method may also include emitting, by a laser of the LIDAR system, a first light pulse into an environment at a second time. The example method may also include receiving, by the photodetector, return light associated with the first light pulse from an object in the environment, the return light reaching the photodetector at a third time, the third time being after the photodetector has ended the recovery period.

A warning receiver can be detachably mounted on the inside of a window of a manned platform to detect RF or RF and laser threats and to provide visual or audio warnings to the human occupant. The warning receiver is fully self-contained and independent of any systems on the manned platform. In different packaging configurations, the receiver can be manually rotated to better visualize the threat and/or the receiver's human-machine interface (HMIF) can be manually rotated to better display the warnings. Although most typically used in manned aircraft the warning receiver can be used in other manned vehicles or ships.