32 results about "Carrier dynamics" patented technology

The invention discloses a loop self-regulation method of a satellite navigation receiver. Judgment and steps for optimizing loop parameters are increased on the basis of keeping original tracking loop structures of the receiver, and loop orders and noise bandwidth can be automatically adjusted according to carrier dynamic information. The method does not need to add a complete inertial navigationsystem additionally.

The invention discloses an SINS / GPS super-compact integrated navigation system and an implementing method thereof. The method comprises the following steps: the doppler frequency assistance is provided for a GPS carrier loop by using the velocity information of a strapdown inertial navigation system, therefore, the loop equivalent bandwidth is increased, the influence of the carrier dynamic stateon the carrier loop is lowered, and the noise suppression capability is improved by reducing the bandwidth of a filter; meanwhile, in order to eliminate the correlation between the pseudo-range rate error and the inertial navigation error, a carrier loop tracking error model is obtained by establishing the relationship between the carrier tracking error and the inertial navigation speed error, and the influence of the carrier tracking error is subduced in the measurement equation; and in addition, the carrier frequency is adjusted according to the output error estimation information, and the tracking accuracy of the carrier loop is enhanced. The invention can effectively enhance the noise suppression capability and the dynamic tracking performance of the tracking loop and enhance the tracking accuracy of a GPS receiver and the navigation accuracy of the integrated navigation system under strong interference and high dynamic circumstance.

The invention provides a dynamic satellite earth station carrier monitoring system. The dynamic satellite earth station carrier monitoring system comprises a dynamic carrier monitoring subsystem and a frequency spectrum information processing subsystem. The dynamic carrier monitoring subsystem is connected with an earth station satellite communication system, and used for carrying out real-time monitoring and analyzing on signals preset at multi-path intermediate frequency monitoring points and radio frequency monitoring points in the earth station satellite communication system to obtain corresponding signal frequency spectrum data. The frequency spectrum information processing subsystem is connected with the dynamic carrier monitoring subsystem, and used for receiving signal frequency spectrum data sent by a digital processing module, managing and storing the signal frequency spectrum data, analyzing the signal frequency spectrum data and giving an alarm signal when finding a fault. The dynamic satellite earth station carrier monitoring system can find the anomalous change of carriers as soon as possible, judge and process the possible existing hidden dangers of the system as soon as possible, and the safety reliability of the system is improved.

The invention discloses a system and method for accurately measuring the dynamic change of the porosity of loaded coal rocks. The system includes a vacuum device, a helium supply device, a porosity measurement device, a porosity change measurement device and Parts such as three-axis servo presses that apply loads. The system can accurately measure the dynamic change of coal rock porosity under loading conditions, and can be used for: 1) accurately measuring the porosity of coal rock samples under specific loads; 2) accurately measuring the porosity of coal rock samples during loading dynamic change law.

The invention discloses a nonlinear initial alignment method for an all-altitude strapdown inertial navigation system, including the main steps of roughly aligning the strapdown inertial navigation system; initiating a double-Euler-angle direct method nonlinear filter of the strapdown inertial navigation system, updating time, measuring measurements, and switching forward and reverse Euler-angle direct methods. The double-Euler-angle direct method and the direct method are fused, the problem of singularity in the single-Euler-angle direct method is solved, the nonlinear initial alignment method is applicable to cases with high carrier dynamics; system equations are mainly velocity differential equations and Euler-angle differential equations, and models are more precise than first approximation of the direct method; navigation resolution is implemented in the filtering process, filtering outputs are navigation parameters, repeated calculations in mechanically arranged equations are avoided, and an algorithm is simpler than the direct method; compared with quaternion direct method, the nonlinear initial alignment method has no need for filtering step modification, and the algorithm is simple.

The invention discloses a long code capture method based on Bayesian estimation. It adopts a matched filter cascade phase rotation method to capture the correlation peak of a long code signal with certain carrier dynamics, and at the same time, taking into account the capture of weak signals, For several correlation peaks that appear, the method of verification is used to effectively eliminate false alarms. This method is characterized by fast capture time and is suitable for situations where resources are limited and there is a high requirement for capture time.