4 results about "Gps measurement" patented technology

The invention belongs to the field of error calibration, and particularly relates to a submerged-load ultra-short baseline underwater calibration system and an installation deflection angle calibration method. The invention discloses a submerged-load ultra-short baseline underwater calibration system and a calibration method thereof for an installation deflection angle, and overcomes the limitation that a traditional calibration method depends on high-precision GPS positioning information. The system comprises a submerged ultra-short baseline subsystem installed on a submersible vehicle and two seabed reference subsystems arranged on the seabed. According to the implementation scheme, a submersible vehicle carries out differential positioning on two seabed references along a preset track, carrier position parameters are eliminated, and a submersible ultra-short baseline installation deflection angle calibration model is established; based on the matrix decomposition theory, an observation equation of each installation deflection angle is constructed, and the installation deflection angles are obtained through an alternating iteration estimation algorithm. Through the method, the installation deflection angle can be estimated without GPS measurement information, and the method is suitable for a submerged platform executing underwater tasks for a long time.

The present application belongs to the field of error calibration, and particularly relates to a submerged ultra-short baseline underwater calibration system and a calibration method for installation angle. The present application discloses a submerged ultra-short baseline underwater calibration system and a calibration method for installation angle, and overcomes the limitation of traditional calibration methods which depend on high-precision GPS positioning information. The present application comprises a submerged ultra-short baseline subsystem installed on a submarine, and two seabed reference subsystems arranged on the seabed. The implementation scheme is as follows: the submarine performs differential positioning on the two seabed references along a preset track, eliminates the carrier position parameters, and establishes a submerged ultra-short baseline installation angle calibration model; based on matrix decomposition theory, an observation equation for each installation angle is constructed, and the installation angle is obtained through an alternating iterative estimation algorithm. Through the present application, the installation angle can be estimated without GPS measurement information, and the present application is suitable for submerged platforms that perform long-term underwater tasks.

The application provides a method for realizing precise measurement of a fixed direction antenna system based on multiple spatial measurement technologies, aiming at the actual situation that multiple sets of feeder systems are installed in a structure closed feeder house, and comprehensively using a static GPS measurement system, a total station measurement system, a laser tracker measurement system and a digital industrial photogrammetry system, the total station measurement system is arranged in the feeder house, indoor measurement reference points and outdoor measurement reference points are set, unification of the indoor measurement reference points in the structure closed feeder house and the outdoor measurement reference points of an antenna main reflector is realized, measurement error of a multi-beam antenna system coordinate system is reduced, and the precision of measurement and adjustment of the antenna main reflector and the feeder system is improved; the precise measurement and adjustment of the spatial absolute position and attitude of multiple sets of feeder systems based on the unified reference of the fixed direction antenna system in the structure closed feeder house is realized, and the measurement and adjustment efficiency of the spatial absolute position and attitude of the feeder system is improved.

Method for estimating a delay of a GPS measurement in a moving vehicle compared to at least one recorded vehicle dynamics parameter, characterized in that a) the first vehicle dynamics parameter or a parameter derived therefrom is compared with a first threshold, b) if the first vehicle dynamics parameter or parameter derived therefrom has remained below the first threshold for a first predetermined period of time, but subsequently exceeds the first threshold for a predetermined second period of time, c) a reference time is determined and at least from this reference time the first vehicle dynamics parameter or a parameter derived therefrom is compared with a reference parameter derived from the GPS measurement and the delay of the GPS measurement is estimated from this.