Method and device for determining gravity gradient demodulation phase angle of rotary accelerometer gravity gradiometer

Abstract

The invention discloses a method and device for determining a gravity gradient demodulation phase angle of a rotary accelerometer gravity gradiometer, and belongs to the field of precision measurement. The method comprises the following steps: firstly, carrying out signal combination conditioning on output signals of four accelerometers to obtain gravity gradient analog signals; then performing A / D conversion on the gravity gradient analog signal by using an A / D converter according to the synchronous pulse signal of the angle information converter to obtain a gravity gradient digital signal; carrying out phase angle demodulation on the gravity gradient digital signal by using a reference signal source to obtain a phase angle data sequence; and finally, carrying out zero-phase low-pass filtering processing on the phase angle sequence, and carrying out mean value processing on the filtered data to obtain an accurate gravity gradient demodulation phase angle. By using the gravity gradientdemodulation phase angle determination method provided by the invention, an accurate demodulation phase angle can be provided for subsequent gravity gradient demodulation, the possibility is providedfor further improving the gravity gradient measurement precision, meanwhile, the operation is simple and convenient, and the development cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of precision measurement, and in particular relates to a method and a device for determining a phase angle of a gravity gradient demodulation of a rotational accelerometer and a gravity gradiometer. Background technique [0002] Gravity gradient measurement technology is of great significance to the research of space science, earth science, geological science, energy exploration, inertial navigation and other fields. At present, gravity gradiometers mainly include rotational accelerometer gravity gradiometers, superconducting gravity gradiometers, cold atom gravity gradiometers, electrostatic gravity gradiometers, and gravity gradiometers based on micromachining (MEMS) technology. Gravity gradiometer is currently the only gravity gradient measurement instrument that is commercially available and successfully used on airborne / shipborne mobile bases. [0003] Rotational accelerometer gravity gradiometer is a ...

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Problems solved by technology

At present, there is no relevant literature published or published on the method of determining the phase angle of the gravity gradient demodulation of the rotational accelerometer gravity gradiometer

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