Abstract:
A method for capturing images of large target area using a single low FOV high resolution camera mounted on an Aerial Vehicle for 3D reconstruction is disclosed. The camera captures sets of images consisting of a nadir image a plurality of oblique images at predefined waypoints or as the Aerial Vehicle travels along a flight path. Oblique images are captured in two perpendicular directions by tilting camera about a single tilt axis at one time thereby preventing bidirectional distortion of objects in images. Further, first direction and second direction define a quadrant of area below the Aerial Vehicle. Oblique images along two perpendicular directions are captured either by using roll and pitch axes, or by using a single tilt axis and a pan axis of camera control mechanism wherein using pan axis the single tilt axis is reoriented in a perpendicular orientation to capture oblique images in perpendicular direction.
Abstract:
The present disclosure pertains to non-planar frame structure of a multi-rotor unmanned aerial vehicle (UAV). Aspects of the present disclosure provide frame structure of a UAV that includes at least two rods 102-1 and 102-2, and one or more center supporting plates 106 holding the at least two rods 102-1 and 102-2 to form a rigid structure, wherein the at least two rods 102-1 and 102-2 are overlapped to form a crossed structure wherein ends of the at least two rods 102-1 and 102-2 construe a polygon, and wherein a plurality of propellers 204 are operatively coupled at the ends of the at least two rods to enable flight of the UAV. The frame structure includes at least four overlapping arms 104-1, 104-2, 104-3 and 104-2, at least two of which are present in different planes and thus, the present disclosure provides a non-planar frame structure of a multi-rotor UAV.
Abstract:
An improved battery pack 100/200 is disclosed, having a plurality of cylindrical cells 102 arranged in parallel disposition in rows 104/204 and columns 106/206 such that positive and negative terminals of any of the cells and the closest surrounding cells are oppositely placed to minimise the overall magnetic field due to the internal current of the cells by the opposite magnetic field of the oppositely placed adjacent cells. The positive and negative terminals at any of or both of upper and lower ends of the cells 102 in a group of adjacently located columns are connected by criss-cross connections 108/208 to provide parallel electric connection of the cells 102 in groups of adjacently located columns 106/206. Criss-cross connections 108/208 pertaining to the terminals of opposite polarity are connected by series connections 110/210 to provide series connection of the sets of cells connected in parallel by the criss-cross connections 108/208.
Abstract:
The present disclosure provides a multi-rotor Aerial Vehicle comprising at least five arms. Pairs of coaxial contra rotating rotors/propellers are configured on each arm defining a polygon. In the event of failure of any one of the rotors/propellers, a control system incorporating an autopilot, shuts off corresponding contra rotating rotor/propeller of the pair to maintain yaw stability thereby rendering the corresponding arm non-functional; and adjusts throttles of the coaxial contra rotating rotors/propellers of remaining functional arms to maintain tilt and lift stability of the Aerial Vehicle.
Abstract:
A device for self-balancing a rotating part, such as a propeller, along a given axis is disclosed. The propeller 102 coupled to a drive shaft with freedom for linear movement along longitudinal axis L-L; at least one pair of levers 614/616, comprising a first lever 614-1/616-1 and a second lever 614-2/616-2, that are pivotally mounted on mounting plate 606 at two diametrically opposite points 618; and at least one pair of weights 622 fixed at external ends of the levers 614/616. inner ends of levers 614/616 are operatively coupled to the propeller 102 such that when propeller 102 undergoes a linear movement in any direction along the longitudinal axis L-L due to unbalance, inner ends of levers are moved to cause the weights 622 to move to provide a balancing force to neutralize the unbalance in the propeller. An embodiment with only one pair of levers is also disclosed.
Abstract:
The present disclosure pertains to a multi-rotor unmanned aerial vehicle (UAV). Aspects of the present disclosure provide a UAV that includes at least four arms, each configured with a co-axial pair of contra rotating propellers, wherein each propeller has capability of rotating reversibly with associated reversal of direction of thrust, and an autopilot control system that controls rotational direction and speed of the at least four co-axial pairs of propellers to maintain yaw stability, roll stability and pitch stability of the UAV, wherein in an event of failure of any one co-axial pair out of the at least four co-axial pairs of propellers, the autopilot control system reverses direction of rotation and thereby direction of thrust of at least one propeller of any functional pair.
Abstract:
A split control system for UAV incorporating auto pilot is disclosed. Control system comprises a real-time low-level main processor, and a non-real-time high-level co-processor. The co-processor computes desired body rate values and feeds them to the main processor which may be with latency. Main processor computes one or more motor control signals based on the desired body rate values. The main processor also executes a rate damping loop algorithm based on instantaneous body rate values to generate one or more motor control signals to maintain stability of the UAV even in events of latency in desired body rate values from the co-processor. Instantaneous body rate values are either obtained directly from sensors without any latency or obtained by main processor indirectly with negligible latency. Main processor acts as an intermediate between sensors and co-processor by collecting raw sensor data and feeding the data to co-processor.
Abstract:
The present disclosure relates to a control system for a retractable belly mounted payload in an Aerial vehicle for retraction, pan and tilt movements of the payload, comprising a first mechanism to rotate the payload about a vertically oriented first axis for pan movement of the payload, and a second mechanism to rotate the payload about a horizontally oriented second axis, wherein rotation of the payload about the second axis provides movement of the payload between a retracted position within belly of the Aerial Vehicle and a deployed position out of the belly of the Aerial Vehicle, as well as tilt movement of the payload in its deployed position. First mechanism is driven by a servo through a set of gears or pulley-belt mechanism, and second mechanism is driven by a directly connected servo connected to the payload. Both the servos rotate along with payload during pan movement.
Abstract:
Embodiments of the present disclosure relate to a belly-mounted retraction mechanism for a payload in a fixed wing UAV. The retractable payload can be a two-axis camera system designed to fit inside the aircraft fuselage cross section. The disclosed retraction mechanism is a servo driven direct link mechanism configured to drive the payload between its retracted/stowed position & projected position by pivotally moving the payload about a horizontal axis. The retraction mechanism gets mechanically locked in retracted and projected positions and can only be moved when driven by the servo thus preventing any unintended movements due to inertia or gravitational forces. The retraction mechanism further comprises a spring to bias the payload against gravitational force for smooth descent of the payload and a slider flap to close the opening when the payload is moved to deployed position.
Abstract:
The present disclosure provides system and method for displaying a plurality of elements of at least one application on a display screen. An aspect of the present disclosure pertains to a method for displaying the plurality of elements of the at least one application on the display screen, the method including the steps of splitting, at a computing device, the display screen into a plurality of sections, associating, at the computing device, at least one section of the plurality of sections with at least one element of the plurality of elements of the at least one application, controlling, at the computing device, at least one display parameter of the at least one section, and displaying, at the computing device, the at least one element on the display screen in split-screen view.