Apparatus and associated methods relate to an open-loop control circuit (OLCC) configured to determine a photodiode element (PDE) drive voltage as a function of a commanded photodiode gain level and a measured temperature signal. In an illustrative example the OLCC may receive a current temperature of an APD element. The OLCC may, for example, receive a commanded gain for the APD relative to a predetermined reference gain. The OLCC may, for example, retrieve a predetermined efficiency characteristic (PEC) of the APD based on the current temperature. If the temperature corresponds to a substantially non-linear portion of the PEC, the OLCC may, for example, determine the drive voltage as a function of the temperature and the commanded gain based on the PEC. Various embodiments may advantageously provide direct control of output gain of photodiodes over a wide dynamic range of temperature associated with the photodiode.

Apparatus and associated methods relate to an open-loop control circuit (OLCC) configured to determine a photodiode element (PDE) drive voltage as a function of a commanded photodiode gain level and a measured temperature signal. In an illustrative example the OLCC may receive a current temperature of an APD element. The OLCC may, for example, receive a commanded gain for the APD relative to a predetermined reference gain. The OLCC may, for example, retrieve a predetermined efficiency characteristic (PEC) of the APD based on the current temperature. If the temperature corresponds to a substantially non-linear portion of the PEC, the OLCC may, for example, determine the drive voltage as a function of the temperature and the commanded gain based on the PEC. Various embodiments may advantageously provide direct control of output gain of photodiodes over a wide dynamic range of temperature associated with the photodiode.

A lidar receiving apparatus, a lidar system, a laser ranging method, a laser ranging controller and a computer readable storage medium are provided. The lidar receiving apparatus includes a photodetector (11), which is configured to receive a reflected laser signal and to convert the reflected laser signal into a current signal when a bias voltage of the photodetector (11) is greater than a breakdown voltage of the same; a ranging circuit (12), which is connected with the photodetector (11) and configured to calculate distance data according to the current signal; and a power control circuit (13), which is connected with the photodetector (11) and configured to control the bias voltage applied to the photodetector (11) according to a predefined rule, wherein the predefined rule includes: at a receiving time of a stray reflected signal, the bias voltage of the photodetector (11) is smaller than the breakdown voltage; and the receiving time of the stray reflected signal is a time at which a transmitted laser signal reaches the photodetector (11) through a stray light path other than a ranging light path. The lidar receiving apparatus may be employed to decrease a short-range blind area.

A lidar receiving apparatus, a lidar system, a laser ranging method, a laser ranging controller and a computer readable storage medium are provided. The lidar receiving apparatus includes a photodetector (11), which is configured to receive a reflected laser signal and to convert the reflected laser signal into a current signal when a bias voltage of the photodetector (11) is greater than a breakdown voltage of the same; a ranging circuit (12), which is connected with the photodetector (11) and configured to calculate distance data according to the current signal; and a power control circuit (13), which is connected with the photodetector (11) and configured to control the bias voltage applied to the photodetector (11) according to a predefined rule, wherein the predefined rule includes: at a receiving time of a stray reflected signal, the bias voltage of the photodetector (11) is smaller than the breakdown voltage; and the receiving time of the stray reflected signal is a time at which a transmitted laser signal reaches the photodetector (11) through a stray light path other than a ranging light path. The lidar receiving apparatus may be employed to decrease a short-range blind area.

A vehicle and ladar sensor assembly system is proposed which makes use of forward mounted long range ladar sensors and short range ladar sensors mounted in auxiliary lamps to identify obstacles and to identify potential collisions with the vehicle. A low cost assembly is developed which can be easily mounted within a body panel cutout of a vehicle, and which connects to the vehicle electrical and computer systems through the vehicle wiring harness. The vehicle has a digital processor which interprets 3D data received from the ladar sensor assembly, and which is in control of the vehicle subsystems for steering, braking, acceleration, and suspension. The digital processor onboard the vehicle makes use of the 3D data and the vehicle control subsystems to avoid collisions and steer a best path.

A vehicle and ladar sensor assembly system is proposed which makes use of forward mounted long range ladar sensors and short range ladar sensors mounted in auxiliary lamps to identify obstacles and to identify potential collisions with the vehicle. A low cost assembly is developed which can be easily mounted within a body panel cutout of a vehicle, and which connects to the vehicle electrical and computer systems through the vehicle wiring harness. The vehicle has a digital processor which interprets 3D data received from the ladar sensor assembly, and which is in control of the vehicle subsystems for steering, braking, acceleration, and suspension. The digital processor onboard the vehicle makes use of the 3D data and the vehicle control subsystems to avoid collisions and steer a best path.

Embodiments of the present disclosure provide an amplification circuit. The amplification circuit includes an operational amplifier; and a clamping circuit being respectively connected to an input terminal and an output terminal of the operational amplifier for clamping an input signal of the amplification circuit to cause the input signal of the amplification circuit to fluctuate within a certain range to prevent the operational amplifier from generating a saturating output.

Embodiments of the present disclosure provide an amplification circuit. The amplification circuit includes an operational amplifier; and a clamping circuit being respectively connected to an input terminal and an output terminal of the operational amplifier for clamping an input signal of the amplification circuit to cause the input signal of the amplification circuit to fluctuate within a certain range to prevent the operational amplifier from generating a saturating output.

The present application provides a lidar receiving apparatus, a lidar system, a laser ranging method, a laser ranging controller, and a computer readable storage medium. The lidar receiving apparatus includes: a photodetector, which is configured to receive a reflected laser signal and to convert the reflected laser signal into a current signal when a bias voltage of the photodetector is greater than a breakdown voltage of the same; a ranging circuit, which is connected with the photodetector and configured to calculate distance data according to the current signal; and a power control circuit, which is connected with the photodetector and configured to control the bias voltage applied to the photodetector according to a predefined rule.

The present application provides a lidar receiving apparatus, a lidar system, a laser ranging method, a laser ranging controller, and a computer readable storage medium. The lidar receiving apparatus includes: a photodetector, which is configured to receive a reflected laser signal and to convert the reflected laser signal into a current signal when a bias voltage of the photodetector is greater than a breakdown voltage of the same; a ranging circuit, which is connected with the photodetector and configured to calculate distance data according to the current signal; and a power control circuit, which is connected with the photodetector and configured to control the bias voltage applied to the photodetector according to a predefined rule.