摘要:
A system and method for obtaining weather related information for a portion of the Earth's atmosphere between a predetermined surface portion of the Earth and an airborne object located over the predetermined surface portion, and operating at a known altitude, using position locating signals from a space vehicle. In one exemplary implementation the space vehicle transmits a first position locating signal. The first position locating signal is received by the airborne object directly from the space vehicle. A second position locating signal from the space vehicle is received by the airborne object after being reflected from the predetermined surface portion at a known angle. Phase information from the first and second position locating signals is used to determine a refractivity of the atmosphere between the predetermined surface portion and the airborne object. The refractivity is used to determine weather related information for the atmosphere.
摘要:
Methods and systems for measuring atmospheric water content, are provided. The method includes measuring a first air temperature and a first air pressure at a first location in a compressor, measuring a second air temperature and a second air pressure at a second location in the compressor, computing a ratio of specific heats from the first and second air temperatures and the first and second air pressures, and determining an atmospheric water content from the ratio of specific heats.
摘要:
An unmanned vehicle is provided. The unmanned vehicle includes a navigation system configured to navigate the unmanned vehicle relative to a beam of energy emitted from a beam source, a power receiver configured to receive energy from the beam, and an energy storage system configured to store received energy for use in selectively powering the unmanned vehicle.
摘要:
Methods and systems for measuring atmospheric water content, are provided. The method includes measuring a first air temperature and a first air pressure at a first location in a compressor, measuring a second air temperature and a second air pressure at a second location in the compressor, computing a ratio of specific heats from the first and second air temperatures and the first and second air pressures, and determining an atmospheric water content from the ratio of specific heats.
摘要:
Methods and systems for measuring atmospheric water content, are provided. The method includes measuring a first air temperature and a first air pressure at a first location in a compressor, measuring a second air temperature and a second air pressure at a second location in the compressor, computing a ratio of specific heats from the first and second air temperatures and the first and second air pressures, and determining an atmospheric water content from the ratio of specific heats.
摘要:
Methods and systems for measuring atmospheric water content, are provided. The method includes measuring a first air temperature and a first air pressure at a first location in a compressor, measuring a second air temperature and a second air pressure at a second location in the compressor, computing a ratio of specific heats from the first and second air temperatures and the first and second air pressures, and determining an atmospheric water content from the ratio of specific heats.
摘要:
Methods and systems for measuring atmospheric water content, are provided. The method includes measuring a first air temperature and a first air pressure at a first location in a compressor, measuring a second air temperature and a second air pressure at a second location in the compressor, computing a ratio of specific heats from the first and second air temperatures and the first and second air pressures, and determining an atmospheric water content from the ratio of specific heats.
摘要:
Data is remotely collected from a plurality of fasteners in response to a query signal wirelessly transmitted by a reader. Each of the fasteners includes a sensor for measuring a parameter related to the stress on the fastener. A device adapted to be attached to each of the fasteners receives the query signal, activates the sensor to measure the parameter and wirelessly transmits the data including the parameter to the reader.
摘要:
A system and method for obtaining weather related information for a portion of the Earth's atmosphere between a predetermined surface portion of the Earth and an airborne object located over the predetermined surface portion, and operating at a known altitude, using position locating signals from a space vehicle. In one exemplary implementation the space vehicle transmits a first position locating signal. The first position locating signal is received by the airborne object directly from the space vehicle. A second position locating signal from the space vehicle is received by the airborne object after being reflected from the predetermined surface portion at a known angle. Phase information from the first and second position locating signals is used to determine a refractivity of the atmosphere between the predetermined surface portion and the airborne object. The refractivity is used to determine weather related information for the atmosphere.
摘要:
An unmanned aerial vehicle (UAV) includes at least one passive reflective device having an elongated configuration defining a long axis and comprising a material configured to reflect radio signals. The UAV also includes a control system configured to control the UAV along a flight path that orients the at least one passive reflective device such that the long axis remains substantially tangential to an ellipsoid whose foci are at two points between which radio communication is desired.