66 results about "Traffic collision avoidance system" patented technology

A display presents to the viewer the outputs of a dual mode Traffic Collision Avoidance System (TCAS)/Intra-Formation Position Collision Avoidance System (IFPCAS). IFPCAS requires the cooperation of a least two formation follower aircraft in conjunction with the formation lead aircraft. The display indicates the relative velocity of the other formation follower aircraft, with respect to the formation lead aircraft, in addition to other types of information.

The present invention is directed to a traffic display for an aircraft, which includes a vertical traffic indicator. The vertical traffic indicator includes flight levels, depicted utilizing differing visual patterns to represent the current flight level as well as available and unavailable flight levels for transit. The vertical traffic indicator includes aircraft indicators positioned in relation to flight levels to indicate attitude. The aircraft indicators may also include status indicators indicating separation standards, vertical trend, intent, or whether an aircraft is a reference aircraft for an ITP. The traffic display provides clear and intuitive means of understanding the flying environment related to the performance of the ITP, increasing situational awareness and simplifying the ITP. The traffic display is specifically advantageous for performance of an ITP, but may be integrated with displays including terrain, weather, flight plan waypoints, or TCAS (Traffic Collision Avoidance System) traffic.

An aircraft taxiing system is provided, comprising a flight control system, an electric taxi system having controls, a flight management system (FMS), at least one data input source coupled to the FMS, and a traffic collision avoidance system (TCAS). The FMS is programmed with instructions to calculate guidance speed and heading commands, augment the guidance commands to avoid runway incursions, and transmit the guidance commands to the flight control system. The TCAS is programmed with instructions to receive Automatic Dependent Surveillance-Broadcast (ADS-B) data from ground traffic, generate collision avoidance alerts; and transmit the collision avoidance alerts to the flight control system. The flight control system is programmed with instructions to receive guidance commands from the FMS, receive the traffic collision avoidance alerts from the TCAS, and compute the steering commands, and transmit the commands to the electric taxi system to taxi the aircraft along a calculated taxi route.

The invention discloses a TCAS (traffic collision avoidance system)-based collision detection method for an airplane formation and application of the method. Based on the original airborne anti-collision, the flight path estimation error during a flight is considered, the collision detection method for the airplane formation is introduced aiming at the formation forming process, various random interference factors on performance are considered, an alarm threshold value and a filtering duration probe time are adjustable, better safety is realized compared with the traditional geological probe, and the virtual alarm probability in the formation forming process is effectively reduced, in addition, once an airplane in the formation is deviated from the designated track range, a system provides alarm information and the management and maintenance for the formation are convenient.

The invention provides a miniature TCAS (Traffic Collision Avoidance System), which is a miniature multifunctional TCAS realized based on a microprocessor and an FPGA (Field Programmable Gate Array) as well as special software. Four devices of the TCAS, two S-mode responders, a control box and a display of systems of the TCAS II are integrated into a whole, thus a bus is reduced, and the transmission of a large quantity of high-frequency signals among the devices is avoided. The system can be linked with navigation systems (such as devices of Big Dipper, GNSS (Global Navigation Satellite System), GPS (Global Positioning System), inertial navigation, tactical air navigation system and the like) directly, and accurate navigation data are used for replacing or correcting the direction and distance data measured by using the original TCAS II, thus more accurate and reliable avoidance decisions are obtained. The novel TCAS has the advantages of small volume and light weight, and integrates all functions of the four devices of the TCAS II; and the volume and the weight of the novel TCAS are below 1/3 that of the TCAS II.

Provided are methods and systems for the disambiguation of an in trail procedure (ITP) vertical display by calculating and rendering symbology on a plan view traffic collision avoidance system (TCAS) display. The symbology represents an intersection point between the ground track of an ITP aircraft and the ground track of a blocking aircraft and further represents an association between the intersection point and the respective ITP blocking aircraft.

The invention relates to a method for integrating a TCAS (Traffic Collision Avoidance System) controller and an S-mode controller. Aiming at the defect of large system volume caused by the separation of the original TCAS controller and S-mode controller, the method adopts a DSP (Digital Signal Processor) + FPGA (Field Programmable Gate Array) architecture, and researches the problem of integration of the TCAS controller and S-mode responder controller in the aspects of signal interfaces, system structure, processing capacity and system functions. No signal collision is produced in the integrated system; the processor has the advantages of stronger functions and higher efficiency; and the implementation method of the system functions remains the same on the whole, but part of functions should be adjusted due to the change of the structure. The interfaces, structure, and allocation and realization of functions of the integrated controller are illustrated.

The invention provides a high-directivity columnar convex surface conformal reflector antenna based on meta-surfaces, and mainly solves the problem that a convex mirror conformal with a columnar convex surface carrier cannot calibrate wave beams. The antenna comprises a columnar convex surface carrier, a convex mirror, a feed source, a coaxial adapter and a supporting structure, the convex mirrorcomprises m*n periodically arranged plane rectangle discrete meta-surfaces, the meta-surfaces are embedded into the convex surface of the columnar convex surface carrier, plane rectangle discrete meta-surfaces comprise dielectric substrates, resonant ring meta-surfaces and radiant floors, I resonant rings with different specifications are periodically and linearly arranged to form the resonant ring meta-surfaces, the resonant rings provide phase compensation for incident waves, beam calibration of electromagnetic waves and synthesis of fan-shaped beams are achieved by the aid of convex mirrorswith arbitrary curvatures, and the feed source is fixed at a focal point of the convex mirror through the supporting structure and feeds through the coaxial adapter. According to the antenna, high-directivity fan-shaped beam radiation is achieved, and the antenna can be used for fields such as wireless communication, obstacle detection and traffic collision avoidance systems.

The invention discloses a Beidou-based air traffic collision early warning method, which comprises the following steps: 1. the monitored aircraft and ground monitoring station use a time service function of the Beidou to synchronize a clock; 2. the monitored aircraft acquires the state information, and transmits the state information to the ground monitoring station at fixed intervals by using the synchronized clock; and 3. the ground monitoring station continuously receives the state information transmitted by the aircraft by using the Beidou system, performs preliminary collision screening and collision time prediction according to the state information and gives an alarm according to the prediction result. The method is simple to implement and low in irradiation and does not have a blind area. According to the method, the collision early warning can be independently performed, and the method can serve as backup of a traffic collision avoidance system and other collision early warning equipment, and is a beneficial supplement.

The invention relates to an ADS-B (Automatic Dependent Surveillance-Broadcast) and (Traffic Collision Avoidance System) data fusion method based on variational Bayes estimation. Time-varying noise of a sensor is on-line estimated by use of a variational Bayes algorithm and is used as a parameter input for observation noise in an IMM (Interactive Multiple Model Algorithm) filter process, and the previous situation that the observation noise is used as a known fixed constant is changed. Because the sensor noise may change due to own characteristics of the sensor and environmental factor in practical application, if the observation noise is set by use of prior knowledge, deterioration of a tracking effect is easily caused. The noise estimated online by use of the variational Bayes can also provide guarantee for the safety of a fusion system besides the situation of the prior knowledge lack of noise. The method plays a good sensing role for the representation situation of harmful elements in the noise.

The invention relates to a novel TCAS (Traffic Collision Avoidance System) local oscillator design method which makes an improvement on the existing condition that two local oscillators are used in the traditional system and designs a novel TCAS local oscillator based on the multi-loop and frequency-mixing phase lock technology. The local oscillator comprises four parts: a large step frequency generation unit, a small step frequency generation unit, a frequency-mixing phase lock loop and a control circuit, wherein the large step frequency unit generates local oscillation signals of the frequency-mixing phase lock loop; the small step frequency unit generates reference signals of the frequency-mixing phase lock loop; an error lock prevention circuit is arranged in the frequency-mixing phase lock loop; and a controller generates signals of 1030 and 1090 MHz by controlling the frequency dividing ratio of a phase lock loop frequency divider and can fast switch between the two signals. The local oscillator provided by the invention has the advantages of low cost, simple structure, high stability and the like.

The invention relates to the design of an alarming method of an integrated traffic collision avoidance system (TCAS) main processor, which finishes generating technical assistance (TA)/random access (RA) consultation of an integrated TCAS. Aiming at the risks of incomplete consideration of influence factors, a slow algorithm and the presence of concealment in the conventional alarm algorithm of the TCAS, the invention provides an alarm model based on reservation time tau and height difference (hPA-hPB) s. The alarm model is adopted as a substitution which is accordant with the international standard, can take R2 as the entire parameter when a parameter list is established, and reduces division operation and can reduce memory space during TCAS hardware calculation; particularly, the distance between two machines is considered according to the same coordinate system and R2 is utilized, so that evolution operation and the like are also avoided; and the rapidness and safety of the alarm algorithm are enhanced effectively.

A multiple beam receiving system provides an angle estimate to targets. The system tracks movements of the targets over time and generates calibration information. The system uses the calibration information to more accurately estimate angle-to-target. The multiple beam receiving system can be part of a monopulse or other radar system, a traffic collision avoidance system, or other electromagnetic sensor.

Provided is a method for achieving C-mode low-voice calling of a traffic collision avoidance system. Layered and different-beam inquiry is conducted on nearby airspace by controlling inquiry power, the number and density of C-mode inquiry responses are effectively reduced, and the airspace electromagnetic environment around an airplane is simpler. After the scheme is adopted, secondary radar can be higher in efficiency and more reliable in the communication process, the air traffic environment sensory capacity is greatly improved, and the reliability and effectiveness of air traffic early warning and collision avoidance are enhanced.

The invention relates to a method for integrating a transceiver circuit of a traffic collision avoidance system (TCAS) with a transceiver circuit of an S-mode responder. According to the defects of increased cost, large volume, heavy weight and the like caused by the structural repetition of transceiver circuits of the former system, the method comprises the following steps of: integrating the transceiver circuits in the TCAS by using a large-scale field programmable gate array (FPGA); providing a timing clock signal by using a phase locked loop (PLL); compiling counters in the FPGA to realize a timer; realizing pulse signals by using a plurality of counters; compiling a state machine in the FPGA to identify the pulse signals; and setting a buffer region and a priority to solve the conflict of the system and the problem that a plurality of planes appear at the same time. Compared with the former system, the system has a simple structure, a flexible realization mode and high expandability, and can embody the integration characteristic better.

The invention discloses a method for automatically transceiving signals for an integrated TCAS (traffic collision avoidance system). Aiming at the defects of complex realization and more occupied resources in the traditional method for automatically transceiving signals, a large-scale FPGA (field programmable gate array) is used for improvement; FIFO (first in first out) is used to buffer original signals; an FSM (finite-state machine) is used to complete a head pulse generator; a coder is used to code data output by FIFO and the data is combined with a head pulse; a preprocessing circuit is used to process received signals, and the signals are reduced into standard signals by combining a threshold circuit with maximum value determination; and finally the signals are demodulated to obtain original data. The method disclosed by the invention can realize the function of transceiving signals stably and reliably, and lays a foundation for realization of the integrated TCAS.

A comprehensive digital mid-frequency receiving system for a TCAS (Traffic Collision Avoidance System) and an S-mode responser comprises a digital down converting module, a TCAS baseband pre-processing module and an S-mode responser baseband pre-processing module, wherein the output terminal of the digital down converting module is connected with the input terminals of both the TCAS baseband pre-processing module and the S-mode responser baseband pre-processing module respectively through signal wires. The realization process comprises the following steps: four sampled mid-frequency digital signals are subjected to unified digital down conversion; b, a TCAS baseband pre-processing passage and an S-mode responser baseband pre-processing passage are separated through information such as radio frequency difference between the TCAS and the S-mode responser, difference between antenna receiving passages and the like; and c, digital signal processing are performed on the two baseband modules respectively, so as to complete inquiry of A/C/S mode, as well as separation, extraction and decoding of answer signals. The comprehensive digital mid-frequency receiving system has the advantages of high speed, flexibility, easiness in maintenance and expansion and the like, and plays an important role of lowering the airplane life cycle cost.