Abstract: An IoT service of a provider network may be used to optimize downlink scheduling for edge devices that use a radio communication protocol (e.g., LoRaWAN). A processing instance receives DL packets from a client application that are to be sent to an edge device. The processing instance adds metadata entries (device ID, message ID) to a metadata queue and stores the DL packets into a data store. A scheduling instance obtains a metadata entry and the associated DL packet, formats the DL packet based on edge device information, and publishes the packet to a gateway topic. A separate connection instance receives the formatted DL packet and sends it to a gateway of the client network.

Abstract: A precision approach path indicator system (PAPI) including multiple LHA indicators and power sources. Each LHA indicator comprises several assembly modules, with each module made up of several red and white LEDs, several collimating lens, one optical combiner, and one projection lens set. From a side view of the module, the red LEDs are placed on top of white LEDs, with a collimating lens in front of each LED. The optical combiner is in front of both the red and white LEDs, slightly above the white LEDs in vertical placement. The optical combiner has a reflective coating on the bottom surface, and a red light filter coating on the projection surface. The combined beam of light is projected out through a projection lens at front of the assembly module.

Abstract: An LED based omni-directional light engine includes a toroidal lens coupled to a controller circuit board and two or more evenly spaced LEDs mounted to the controller circuit board. The toroidal lens includes an inner surface coated with a layer of reflection materials, an outer surface, and a flat base surface. The controller circuit board is electrically coupled to a power source. The LEDs are located immediately under the flat base surface. The inner surface substantially reflects light beams emitted from the LEDs to the outer surface which refracts the beams to the omni-directions.

Abstract: The Field Testing Instrument (FTI) is designed for use in the regular maintenance and installation of airport Precision Approach Path Indicator (PAPI). The FTI is a self-contained and portable instrument that accurately measures the most important PAPI parameters, such as vertical aiming angle, transition angle, and light intensity. In addition to working with the current incandescent PAPIs, the FTI also measures parameters specific to the next generation LED PAPI. The FTI uses modern, efficient technology to reduce the life-cycle cost of approach lighting systems. The FTI improves on traditional PAPI testing methods by directly measuring the PAPI light beam focused to a target plate, as if seen from the pilot perspective. Due to significantly improvements in measurement accuracy and reliability, the FTI may supplement and even replace costly flight checks for PAPI maintenance with ground based operation.

Abstract: This invention discloses a traffic monitoring system, which uses Doppler sonar to measure the direction and speed of people and object moving within a target area, such as a secure one way exit. The system is un-obtrusive, accurate, and easy to operate. In case of unauthorized movement direction, the system triggers build-in alarms, as well as signals the integrated security and surveillance systems. The system consists of Head Modules, which are responsible for sending and receiving continuous ultra-sound wave at a pre-set direction of traffic and digital processing of the data; and Management Module, which is responsible for controlling the system, as well as interfacing with other surveillance and security systems.

Abstract: A visual navigational aid for guiding the approach path of incoming aircrafts, ships or other vehicles. The visual navigational aid comprises high intensity light emitting diodes (LEDs) or LED arrays and optical beam shaping apparatus that produce multiple light beams with different colors or flash patterns to guide the incoming aircrafts, ships or other vehicles to a pre-determined approach path.

Abstract: The Field Testing Instrument (FTI) is designed for use in the regular maintenance and installation of airport Precision Approach Path Indicator (PAPI). The FTI is a self-contained and portable instrument that accurately measures the most important PAPI parameters, such as vertical aiming angle, transition angle, and light intensity. In addition to working with the current incandescent PAPIs, the FTI also measures parameters specific to the next generation LED PAPI. The FTI uses modern, efficient technology to reduce the life-cycle cost of approach lighting systems. The FTI improves on traditional PAPI testing methods by directly measuring the PAPI light beam focused to a target plate, as if seen from the pilot perspective. Due to significantly improvements in measurement accuracy and reliability, the FTI may supplement and even replace costly flight checks for PAPI maintenance with ground based operation.

Abstract: An LED based omni-directional light engine includes a toroidal lens coupled to a controller circuit board and two or more evenly spaced LEDs mounted to the controller circuit board. The toroidal lens includes an inner surface coated with a layer of reflection materials, an outer surface, and a flat base surface. The controller circuit board is electrically coupled to a power source. The LEDs are located immediately under the flat base surface. The inner surface substantially reflects light beams emitted from the LEDs to the outer surface which refracts the beams to the omni-directions.

Abstract: A precision approach path indicator system (PAPI) including multiple LHA indicators and power sources. Each LHA indicator comprises several assembly modules, with each module made up of several red and white LEDs, several collimating lens, one optical combiner, and one projection lens set. From a side view of the module, the red LEDs are placed on top of white LEDs, with a collimating lens in front of each LED. The optical combiner is in front of both the red and white LEDs, slightly above the white LEDs in vertical placement. The optical combiner has a reflective coating on the bottom surface, and a red light filter coating on the projection surface. The combined beam of light is projected out through a projection lens at front of the assembly module.

Abstract: A protective venting system is disclosed for self-contained marine and aviation lighting equipments. The venting system is capable of preventing battery gas buildup in the enclosure of the lighting equipment as well as maintaining its pressure equilibrium with the outside environment. In addition, the venting system is water and dust proof to prevent debris or ice buildup.

Abstract: A light emitting diode (LED) signaling apparatus for navigational aids is provided. The signaling apparatus comprises a plurality of high intensity LEDs with their output beams individually controlled by high precision optical beam transformers. The transformed LED beams are mixed in a predetermined manner by controlling the relative position, angular orientation, and other parameters of the LEDs to produce a desired illumination pattern.

Abstract: A diode-pumped solid-state laser (DPSSL) has self-maintained multi-dimensional optimization. The output property of the DPSSL, including optical power, noise level, and the operation conditions of its individual components, including the drive current and temperature of the laser diode, the temperature of the laser crystals and laser cavity, the drive current of the thermoelectric coolers, is monitored and systematically optimized in real time through automatic electronic control using a microprocessor. Such monitoring and optimization enable the DPSSL to maintain its optimum performance in output power, beam quality, noise level, and stability, throughout its lifetime regardless of component aging and change of environmental conditions. A highly accurate temperature monitoring and control method is also developed.

Abstract: A quickly deployable and reconfigurable light emitting diode (LED) lighting apparatus with high output intensity and precisely controlled beam property is disclosed for navigational aids. The lighting apparatus comprises an array of high intensity LED units with their light beams individually controlled by secondary optical systems. The transformed light beams mix in a pre-determined manner to produce an illumination pattern with desired intensity distribution. The LED lighting apparatus may further comprise a micro-controller, a plurality of sensor elements, and a wireless transceiver for remote monitoring and control. The lighting apparatus can be powered by rechargeable batteries for temporary or semi-permanent lighting. It can also be powered by standard power lines for permanent lighting.

Abstract: A visual navigational aid for guiding the approach path of incoming aircrafts, ships or other vehicles. The visual navigational aid comprises high intensity light emitting diodes (LEDs) or LED arrays and optical beam shaping apparatus that produce multiple light beams with different colors or flash patterns to guide the incoming aircrafts, ships or other vehicles to a pre-determined approach path.

Abstract: A projection lighting apparatus is disclosed for marking and demarcation applications in airports, waterways, and industrial environments. The lighting apparatus comprises a plurality of high intensity LEDs with their output coupled to the input ends of a plurality of optical fibers. The output ends of the optical fibers are packaged to form a desired illumination pattern. The illumination pattern is projected onto the target surface through a secondary optical system for marking and demarcation enhancement.

Abstract: A temperature insensitive diode-pumped solid state laser is disclosed in this invention. The components of the laser are optimized with temperature insensitive design, making the laser capable of operating in a wide temperature range without using any cooling/heating system to maintain the temperature of its components.

Abstract: A quickly deployable and reconfigurable light emitting diode (LED) lighting apparatus with high output intensity and precisely controlled beam property is disclosed for navigational aids. The lighting apparatus comprises an array of high intensity LED units with their light beams individually controlled by secondary optical systems. The transformed light beams mix in a pre-determined manner to produce an illumination pattern with desired intensity distribution. The LED lighting apparatus may further comprise a micro-controller, a plurality of sensor elements, and a wireless transceiver for remote monitoring and control. The lighting apparatus can be powered by rechargeable batteries for temporary or semi-permanent lighting. It can also be powered by standard power lines for permanent lighting.

Abstract: A light emitting diode (LED) signaling apparatus for navigational aids is provided. The signaling apparatus comprises a plurality of high intensity LEDs with their output beams individually controlled by high precision optical beam transformers. The transformed LED beams are mixed in a predetermined manner by controlling the relative position, angular orientation, and other parameters of the LEDs to produce a desired illumination pattern.

Abstract: A high intensity solid-state lighting apparatus is disclosed for the application of navigational aids. In various embodiments based on the approach of chip-on-board packaged semiconductor light emitting elements, unidirectional, bidirectional as well as omni-directional navigational lights are configured to meet high luminous intensity requirements. They also provide additional utilities for generating multiple colors and flash patterns with the same light unit for lighting reconfiguration as well as creating new means of signaling. Another purpose of the current invention is to provide a light source which will not cause vertigo effects.

Abstract: A temperature insensitive diode-pumped solid state laser is disclosed in this invention. The components of the laser are optimized with temperature insensitive design, making the laser capable of operating in a wide temperature range without using any cooling/heating system to maintain the temperature of its components.