3 results about "Meridian plane" patented technology

The present invention relates to a three-dimensional real-time attitude determination method for a polarization compass based on a polarization meridian plane. First, based on a solar polarization field imaging mode, the solar polarization neutral point and the solar vector are extracted respectively to establish a polarization meridian plane model; secondly, based on the conversion relationship between the polarization meridian plane in a geographic coordinate system and a polarization coordinate system, a measurement model of the polarization meridian plane is established; finally, based on the polarization meridian plane measurement model, a solar vector coordinate system conversion model is combined to calculate the real-time attitude information of the polarization compass, namely, the heading angle, the pitch angle and the roll angle. The present invention uses a polarization meridian plane to characterize the propagation process of incident polarized light, expands a two-dimensional characteristic solar vector into a three-dimensional characteristic polarization meridian plane, and realizes autonomous attitude determination of a polarization compass without the aid of an external horizontal reference instrument, thereby solving the problem that polarization navigation cannot realize three-dimensional real-time attitude determination when only a single solar vector is considered; and overcoming the requirement that the symmetric characteristics of the orientation method based on the polarization meridian need to be placed horizontally.

The application discloses a non-rotation type integral inertial particle separator design method, which comprises the following steps: S1, establishing an XY coordinate system and determining a plurality of key nodes on a meridian plane flow passage profile and coordinates of the key nodes; S2, setting a slope value for each key node; S3, calculating a two-degree-of-freedom adjustable curve between two key nodes which need to be connected into a line; S4, calculating the two-degree-of-freedom adjustable curve between all the key nodes which need to be connected, and sequentially connecting to form a meridian plane flow passage profile of the non-rotation type integral inertial particle separator; and S5, rotating the meridian plane flow passage profile by 360 degrees around the x-axis of the coordinate system to generate a solid of revolution, and obtaining a three-dimensional geometric configuration of the non-rotation type integral inertial particle separator. i,1 i,2 The application adopts a two-degree-of-freedom adjustable curve function, and the shape of the curve between any adjacent key nodes can be freely changed by changing free parameters O i,1 i,2 , O i,2 , so that the design and research of the parameterization of the non-rotation type integral inertial particle separator are more flexible and rapid.

A method for determining a weather condition, comprising: measuring horizontal irradiance; measuring first slope irradiance and second slope irradiance, a first slope and a second slope being arranged to face the sun and being symmetrical about the meridian plane; determining an azimuth irradiation deviation rate according to the horizontal irradiance, the first slope irradiance, and the second slope irradiance; and determining a weather condition according to the horizontal irradiance, the first slope irradiance, the second slope irradiance, and the azimuth irradiation deviation rate. Also provided is a device for determining a weather condition.