SU1035423A1 - Method of meridian determination by means of pendulum gyrocompass - Google Patents

Description

1035 23

M is the uncontrollable ver- tical, disturbing moment;

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the initial deviation of the main axis of the gyrocompass from the plane of the meridian;

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The invention relates to instrumentation, in particular, to methods for determining the geographic meridian using a three-stage gyrocompass. A method for determining the aHaJ meridian according to which, in order to shorten the determination time, maintain the speed of the precession of the sensitive element in azimuth by changing the kinematic moment and determine the plane of the Meridian in the position of the sensitive element at the extremum of the kinetic moment C 1 The disadvantage of the method is the long duration Processes determining diana Merit, which is associated with the principal axis of the necessity of passing the angular momentum meridian plane in the process of determining of the latter. In addition, in the presence of an uncontrolled vertical disturbing moment, the position of the sensitive element at the extremum of the kinetic moment is displaced from the meridian. This bias causes an error in the determination of the meridian. There is a known method for determining the meridian by a pendulum gyrocompass, consisting of an initial exhibit. the main axis of the gyrocompass sensing element into the meridian plane, accelerating the rotor of the sensing element of the gyrocompass to the initial angular velocity, unloading the gyrocompass sensing element, measuring the rotation angles of the gyrocompass sensing element relative to the gyrocompass body at fixed points in time and accurately determining the direction of the meridian taking into account the data obtained 2. The disadvantage of this method is that the direction of the meridian is defined as the equilibrium position of the vibrations of the sensitive element. The presence of an uncontrolled disturbing moment M around the vertical axis of the sensing element causes a shift in the equilibrium position of the oscillations, which is an error in the determination of the meridian. At the same time, the measurement time is added from the acceleration time of the rotor to the nominal rotational speed and the time required to determine the equilibrium position of the azimuthal oscillations of the sensitive element after acceleration. The purpose of the invention is to improve the accuracy and reduce the time for determining the meridian. This goal is achieved by the fact that according to the method of determining the meridian, a rotated gyrocompass, consisting in the initial exhibition of the main axis of the sensing element of the gyrocompass into the plane of the meridian, accelerating the rotor of the sensitive element N, is the counting corresponding to the position of the meridian N. - current values of readings that determine the angles of rotation of the sensitive element relative to the housing of the instrument, azimuth; horizontal and vertical components of the angular velocity of rotation of the Earth; “V-V4 is the current value of the rotor kinetic moment; the initial value of the kinetic moment of the rotor; B cohst is the rate of change of the rotor kinetic moment; t. Atn ut current time; the interval between the moments of information retrieval; mgl-u -h: tickiness of the instrument; M - uncontrolled - vertical disturbing moment; n - the amount of measurement. If there is redundant information (p), the accuracy of determining the meridian is significantly improved by applying one of the methods of mathematical filtering, for example, the least squares method, to the processing of measurement results, followed by solving relation systems for determining NQ on a computer. The drawing shows a diagram of the implementation of the proposed method. According to the signal of the companion compass 1, which is a coarse determinant of the plane of the meridian, the body 2 of the gyrocompass is installed by the engine 3 in azimuth so that the main axis 4 of the gyrocompass is in the plane of the meridian. At this time, the sensitive element 5 of the gyrocompass is fixed by the arresting device 6 relative to the instrument case. In the specified locked position, the rotor 7 is accelerated to the initial angular velocity. After this, the sensitive element is razar-izretirovaniya and begin to increase the speed of rotation of the rotor according to a linear law, at the same time the sensitive element begins to rotate in a horizontal plane. Together with the sensitive element

the housing of the device is rotated and the tracking housing 8. This rotation is made by the engine 9 according to the signals from the angle sensor 10 of the relative position of the sensing element and the tracking housing. The angles of rotation of the sensing element (the following body j are measured by the angle of rotation sensor 1f at fixed points in time. After the information retrieval process is completed, the sensitive element is arrested and a count is calculated that corresponds to the meridian plane.

The use of the proposed method makes it possible to increase the accuracy of determining the geographic meridian by a triple-mounted gyrocompass on a base stationary relative to the Earth w reduces its determination time. The increase in accuracy is due to the fact that this formula takes into account the effect of the uncontrolled disturbing moment on the movement of the gyrocompass axis, and the reduction in the time to determine the meridian is achieved by using the rotor acceleration mode.

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Claims (2)

METHOD FOR DETERMINING THE MERIDIAN OF THE PENDULUM GYROCOMPAS, consisting in the initial exhibition of the main axis of the gyrocompass sensing element into the meridian plane, accelerating the gyrocompass sensitive element to the initial angular velocity, sizing the gyrocompass sensitive element, measuring the rotation angles of the gyrocompass sensitive element relative to the gyrocompass body and determining the time at fixed times in the direction of the gyrocompass Meridian, taking into account the data obtained, characterized in that, in order to increase eniya accuracy and reduce detection time meridian after razarretirovaniya gyro sensor changed angular velocity of rotation of its rotor linearly, and the exact definition h = consi ~ i. = 4tib ^x mgl reference corresponding to the position of the meridian plane; current readout values, which determine the rotation angles of the sensing element relative to the instrument body in azimuth horizontal and vertical components of the angular velocity of rotation of the Earth; current value of the kinetic moment of the rotor; initial value of the kinetic moment of the rotor; the rate of change of the kinetic moment of the rotor; current time; the interval between the moments of information retrieval; mgl - ^ h'2 device pendulum; Μ * uncontrolled ver ¹ -, tical disturbing moment; '\ ( ² M), "42M). "Functions of Bessel I and P of the first order; - ^ 2 ^ 2 "FU ^microns IRS Bessel I and P genus of the second order; I = 3.1415 with £ _o · - the initial deviation of the main axis of the gyrocompass from the plane • of the meridian; d _o - the initial speed of the sensing element during sizing; I = 1 - η η is the number of measurements.