METHOD OF ESTIMATING A LOW-LEVEL CIRCUIT OF AIRCRAFT CONTROL Russian patent published in 2019 - IPC G01C7/00 

FIELD: test equipment.

SUBSTANCE: invention relates to test equipment and can be used for assessment of qualitative characteristics of low-flight flight control circuit. Method includes modeling of virtual terrain, use of dynamic model of tested aircraft (AC), decomposition of specified route of mountain relief on N (for example, 16) of elementary links, by which are elements of underlying relief, located on flight path, with characteristics specified in tactical-technical assignment. Creation of altitude-velocity area of specific aircraft, providing for unconditional flying over of obstacles. Set of links located in any order forms virtual mountain relief, which aircraft can fly at preset height of low-level mission (LLM). LLM is performed over each link in series in the entire permitted altitude-speed range of the LLM. Flight for estimation of low-level circuit (LLC) is performed in conditions of flat terrain in the absence of any real dangerous obstacles. Route is developed with reference to geographical coordinates (ϕ, X) defined by navigation system onboard of aircraft. To geographical coordinates (ϕ, X), determined by navigation system on board of aircraft, add shifts Δϕ, Δλ so that position of aircraft relative to digital map of area (DMA) corresponds to aircraft position on test route. Technical result of using “virtual” polygons is: use of standard on-board information systems instead of models; impact on aircraft of real disturbances (atmosphere turbulence, proximity of earth surface, etc.), moreover, perturbation is simple enough to imitate; absence of necessity in development of terrain profile model and abnormal digital computer onboard of aircraft; possibility of training and flight crew training in real flights; flightability assessment of LLC ergonomics; possibility of evaluating actuation of safety devices and dynamics of removal from dangerous height H_dang in presence of sufficient height margin; possibility of using obtained results, after checking ergodicity of relief, in statistical processing of materials; reducing the number of flights required for estimating LLC in mountainous areas; increased time of test flight and reduced fuel consumption and as a result – reduction of total number of test flights for assessment of LLC.

EFFECT: technical result is expansion of functional capabilities.

1 cl, 20 dwg