31 results about "Joint influence" patented technology

The invention provides an obstacle trajectory prediction method and device and unmanned equipment. According to one specific embodiment of the invention, the method comprises the following steps: for each target moment in a plurality of target moments in a future preset time period, executing the following operations to predict a track point of each obstacle in a plurality of obstacles at the target moment: determining the positioning information of the unmanned equipment and each obstacle at the previous moment of the target moment; determining a global interaction vector of the previous moment based on the positioning information, wherein the global interaction vector is used for representing common influence factors of the unmanned equipment and the plurality of obstacles on motion; and predicting a track point of each obstacle at the target moment based on the global interaction vector. The future track of the obstacle predicted by the method is closer to the actual track, so that the path planning result of the unmanned equipment is more reasonable.

The invention provides a positioning method and apparatus based on hotspot groups. The method comprises the following steps: dividing hotspots in a positioning area into a plurality of hotspot groups,wherein each hotspot group at least comprises two hotspots; setting sampling points corresponding to the hotspot groups; selecting a first target hotspot group; detecting whether a to-be-positioned point is matched with at least one sampling point corresponding to the first target hotspot group; if so, determining the location information of the to-be-positioned point according to the location information of the sampling point; and if not, selecting other hotspot groups for positioning. According to the method, the hotspots in the positioning area are divided into the plurality of hotspot groups, and the sampling point is determined according to the hotspots in the hotspot group, as the sampling point has correlation with the hotspots, the hotspots in the hotspot group can affect the matching result of the sampling point and the to-be-positioned point together, therefore when a certain hotspot in the hotspot group is abnormal due to external factors such as shielding or the like, thesampling point cannot be matched with the to-be-positioned point, so that the abnormal sampling point is excluded to avoid negative influence on the subsequent positioning.

The invention relates to an earth gravitational field precision measurement method, in particular to a satellite gravity inversion method based on a gravity gradient error model principle. Through analyzing the joint influence of a satellite gravity gradient vertical tensor error, a horizontal tensor error and a correlation tensor error to an accumulated total geoidal surface precision, a novel gravity gradient error model is established, and thus an earth gravitational field is inverted precisely and quickly. The satellite gravity inversion method based on the gravity gradient error model principle is high in inversion precision, quick in earth gravitational field calculating speed, and beneficial for gravity gradient satellite error analysis. The physical meanings of a satellite observation equation is clear, and the requirement to computer performance is low, and thus the satellite gravity inversion method based on the gravity gradient error model principle is an effective method for the inversion of a high precision and high spatial resolution earth gravitational field.

The invention provides a sequential multi-antenna selectable transmitting method for code-division multi-path channel. The sequential multi-antenna selectable transmitting method is used for the combined antenna selection and beam shaping of a TD-HSPA+ and comprises the steps of replacing the downlink practical wireless multi-path channel parameters with the obtained uplink channel parameters; calculating the equivalent channel related matrix of a system; selecting the transmitting antenna to join in the data transmission by a sequential way; selecting the transmitting antenna according to the second characteristic value criteria of maximum equivalent channel related array; after selecting the antenna, calculating the related array RK of the selected antenna; carrying out beam shaping according to the characteristic vector of the RK and sending data stream. The sequential multi-antenna selectable transmitting method meets the experience truth that the system performance mainly depends on the data path of the dual streams with the worst sending channel quality, sufficiently considers the common influence factor of the multipath channel is sufficiently considered, and the system performance is improved greatly. Furthermore, according to the sequential antenna selecting method, the practical complexity the simplified and the feasibility is improved.

The invention discloses a method for predicting the optical power of an LED device, comprising the following steps: S1. At a constant junction temperature T0, measure the characteristic parameters ki and ko of the LED device according to the change curve of the optical power of the LED device with the input current, wherein , ki is the slope of the change curve of optical power with input current, ko is the intercept of the change curve on the optical power; S2, under constant input current I, according to the change curve of light power of LED device with junction temperature, measure the LED device The characteristic parameter kti and kto, wherein, kti and kto satisfy kt=-ktilnI-kto, kt is the e index coefficient of optical power-junction temperature curve; S3, according to formula Popt=(kiI+ko) exp[-(ktilnI+ kto)(Tj‑T0)], to predict the optical power Popt of the LED device at any junction temperature Tj and input current I. The invention considers the joint influence of junction temperature and input current on optical power, can predict the optical power of LED devices at any junction temperature and input current, and the prediction accuracy of steady-state optical power is improved, and can also be used to predict the dynamics of LED devices Optical power.

The invention discloses a multipurpose coating and plating layer thickness measuring arm which comprises a measuring system, a clutch device, a transmission system and a rotation device. The measuring system adopts a laser probe to measure the thickness of a coating and plating layer on a measured surface, the clutch device is used for achieving separation and meshing of the measuring system and the transmission system, the transmission system is used for driving the laser probe of the measuring system to rotate a certain angle, and the rotation device is used for achieving switchover of the measuring system between a general working mode and a special working mode. The measuring accuracy of the measuring arm is influenced by the laser probe and the transmission device together. The multipurpose coating and plating layer laser measuring arm has the advantages of being convenient to operate and high in efficiency. Measurement of parts of various specifications can be achieved on one device.