摘要:
PROBLEM TO BE SOLVED: To vary coverage of a detection zone by changing a range gate in each antennal beam.SOLUTION: A radar detection process includes computing a derivative of an FFT output signal to detect an object within a specified detection zone. A zero crossing in the second derivative of the FFT output signal indicates the presence of an object. The range of the object is determined as a function of the frequency at which the zero crossing occurs. Moreover, a detection table containing indicators of the presence or absence of an object within respective radar beams and processing cycles is described. At least two such indicators are combined in order to detect the presence or absenceof an object within the detection zone.
摘要:
PROBLEM TO BE SOLVED: To provide a radar return processing system and a method. SOLUTION: A radar return processing system and a method are operable to process radar information when an installation vehicle 122 operates in proximity to a surface area of interest. An exemplary embodiment reduces the energy of an output pulse emitted from a radar system 410, receives a plurality of radar echoes from a plurality of objects that reflect the reduced energy output pulses emitted from the radar system 410, determines a surface area of interest based upon at least a current location of the installation vehicle 122, and filters the radar echoes generated by objects to remove them that are located outside the surface area of interest. Optionally, some of the systems and methods may reduce a sweep range of an antenna on which the reduced energy output pulses are emitted. COPYRIGHT: (C)2010,JPO&INPIT
摘要:
A radar system includes a transmit antenna for transmitting a first RF signal, a receive antenna for receiving a second RF signal, and a receiver circuit coupled to the receive antenna for processing the second RF signal and comprising a video amplifier having a temperature compensating attenuator. A radar receiver includes an RF amplifier, a down-converter and a video amplifier comprising a temperature compensating attenuator. The RF amplifier has an input terminal adapted to receive an RF signal and an output terminal at which an amplified RF signal is provided. The down-converter has an input terminal coupled to the output terminal of the RF amplifier and an output terminal at which a lower frequency signal is provided. The video amplifier has an input terminal coupled to the output terminal of the down-converter and an output terminal at which a filtered signal is provided.
摘要:
A method of determining conflicting flight paths between a first and a second airborne vehicle is provided, wherein each vehicle comprises an aircraft-to-aircraft navigational communication system having a navigational device. First, a position and a velocity vector are determined for each of the airborne vehicles. A cylindrical volume is then defined about the first airborne vehicle. A separation distance is then determined between the vehicles at a selected time and using a great circle earth model. An accuracy factor is thereafter determined for the position of each vehicle. The separation distance is then modified by the accuracy factor. A determination is then made as to whether the modified separation distance is within the cylindrical volume about the first airborne vehicle during a time range to thereby determine whether conflicting flight paths exist between the vehicles. An associated system and computer software program product are also provided.
摘要:
PROBLEM TO BE SOLVED: To provide a resolution improvement processor that reduces degradation in an SN ratio of a main lobe without requiring a large-capacity memory.SOLUTION: A resolution improvement processor provided in a target detector for detecting existence of a target improves the resolution of a signal received by the target detector, and includes: a first variation calculation unit 110 for calculating a variation of the signal received by the target detector per a unit quantity of any one of an angle direction and a distance direction as a first variation; a second variation calculation unit 120 for calculating a variation of the first variation, per the unit quantity of any one of the angle direction and the distance direction, as a second variation; a coefficient determination unit 130 for determining at least one coefficient on the basis of the first and second variations; and an output signal generation unit 140 for generating an output signal by performing calculation corresponding to multiplying an antilogarithm value of the received signal by at least one coefficient.