40 results about "Receiver autonomous integrity monitoring" patented technology

Disclosed is a method for providing a Global Navigation Satellite System (GNSS) navigation position solution with guaranteed integrity in non-controlled environments, the method including processing a (GNSS) signal including multiple satellites generating at least one signal to obtain carrier phase and pseudorange measurements; pre-processing the measurements to detect and characterize local errors in the measurements, wherein the local errors cannot be ascertained a priori, the characterization including providing error bounds estimated by measuring the carrier phase and pseudoranges measurements, thereby providing a set of measurements rejections when the characterization is not possible; and using the estimated error bounds, together with error bounds provided by the GNSS signal concerning satellite and ionospheric errors, to build in each measurement an estimated noise level in the measurements as input to a weighted Receiver Autonomous Integrity Monitoring (RAIM) algorithm in order to compute position coordinates and associated protection levels in the non-controlled environments.

The invention discloses a new method for RAIM (receiver autonomous integrity monitoring) based on a satellite selecting algorithm in a multimode satellite navigation system. The method comprises the steps of first determining space position information of satellites according to a navigation message and eliminating satellites with a small elevation angle according to a shielding angle; determining an observation matrix including only one clock correction item according to clock correction conversion factors in the navigation message; selecting p satellites from N visible satellites so as to be used for positioning calculation of a receiver, acquiring a satellite combination, which enables the GDOP (geometric dilution of precision) to be minimum, through the satellite selecting algorithm to act as calculating satellites, and determining a weight matrix in WLS (weighted least squares) according to parameters such as the carrier-to-noise ratio, the loop bandwidth, pre-check integral time and the like of satellite signals; carrying out RAIM availability detection according to a false alarm rate and a missed alarm rate which are preset by the receiver, and calculating a pseudo-range residual error threshold value after positioning according to the false alarm rate and a degree of freedom in Chi-squared distribution; carrying out global detection at first, then carrying out local monitoring in a circumstance that a fault satellite exists, determining calculation satellites again through satellite selection, and finally carrying out positioning calculation through selecting satellite combinations within the threshold value. The method disclosed by the invention is simple, high in fault recognition rate, not only applicable to multi-mode and multi-fault satellite navigation systems, but also applicable to single-mode and multi-fault satellite navigation systems, thereby providing new ideas for carrying out RAIM by a modern GNSS (global navigation satellite system).

Methods for reducing the resources needed to detect and identify faulty pseudorange measurements in a GNSS receiver are described. In a Receiver Autonomous Integrity Monitoring (RAIM) method, a position solution is calculated using a weighted least squares method on measurements from satellites of one or more GNSS constellations. A test statistic is calculated from residuals and a threshold is calculated based on a probability function. If the test statistic is greater than or equal to the threshold, a subset is selected from the set of pseudorange measurements using a metric indicative of possible measurement error. A measurement is selected from the subset using a metric indicative of signal strength or some other metric and discarded from the set of pseudorange measurements. If the number of measurements remaining in the set of pseudorange measurements is greater than five, the method loops back to the step of calculating a position solution.

The invention relates to global satellite navigation system receiver autonomous integrity monitoring technology and discloses a parity vector method-based double-satellite failure recognition method, aiming at the problems of false positives and false negatives caused by fault deviation offsetting when the parity vector method is used for recognizing two fault satellites. According to the technical scheme, the parity vector method is used for recognizing one fault satellite; with the fault satellite as the basis, four fault-free satellites are found out, and the information of the fault-free satellites is used for roughly locating, so that the fault satellites can be recognized; the recognized fault satellites are removed, and then the position resolution is carried out again, so that the locating accuracy is improved; therefore, the problems of false positives or false negatives caused by fault deviation offsetting can be avoided. The method solves the problem of the fault deviation offsetting caused by parity vector residual error and realizes the detection and the recognition for a plurality of fault satellites. After the method is used for detecting and recognizing satellite failure, the locating accuracy is improved. The method is mainly used for monitoring the autonomous integrity of a global satellite navigation system receiver.

The invention discloses a receiver autonomous integrity monitoring method used for a satellite navigation system, which is an RAIM method based on multi-satellite fault detection and removal and achieve the fault removal goal by a mode of acquiring constellations comprising the most fault-free satellites. In the method, fault-free individuals are formed by adopting coding, initialization and individual detection; then an individual comprising the most fault-free satellites is obtained by optimal search, and the individual is used as an initial result; when terminal condition is satisfied, the individual is the final result of RAIM. The method has simple realization, high fault removal efficiency and good robustness, not only can carry out single-fault detection and removal but also can carry out multi-fault detection and removal, is not only suitable for single system but also is suitable for multisystem and effectively achieve the goal of carrying out multi-satellite fault detection and removal in the RAIM method.

The invention discloses a method for monitoring autonomous integrity of a GNSS receiver, relates to a receiver autonomous integrity monitoring technology, and belongs to the technical field of measurement and test. The method adopts a CKF-based and innovation extrapolation method to achieve monitoring of the autonomous integrity of the GNSS receiver, and innovation generated in an innovation extrapolation process and a variance-covariance matrix thereof construct test statistic of each extrapolation moment, micro slowly-changing pseudo-range deviation can be tested; a machine learning algorithm is adopted to judge and classify the test statistic of the each extrapolation moment, and dynamically updates a fault database used for generating a machine learning rule at the same time; on-line learning of judgment rules of unmodeled fault types has the advantages of being less in calculation amount, proper in precision, suitable for nonlinear systems and capable of monitoring the micro slowly-changing pseudo-range deviation with high confidence degree.

The invention provides an ARAIM ground monitoring station integrity monitoring method and an ARAIM ground monitoring station integrity monitoring device. The ARAIM ground monitoring station integrity monitoring method provided by the invention comprises the following steps: acquiring first user range accuracy URA and second user range accuracy URA, wherein the first user range accuracy URA is the user range accuracy URA in a current preset period of time, and the second user range accuracy URA is the user range accuracy URA in a future preset period of time; determining an adopted advanced receiver autonomous integrity monitoring ARAIM structure according to the first user range accuracy URA, the second user range accuracy URA and a preset user range accuracy URA threshold, wherein the ARAIM structure is an online or offline structure; and performing ARAIM ground monitoring station integrity monitoring according to the ARAIM structure. The ARAIM ground monitoring station integrity monitoring method and the ARAIM ground monitoring station integrity monitoring device provided by the invention can meet the requirement of most areas for accuracy and integrity. The application rang is expanded, and the usability of LPV-200 is improved.

The invention discloses a particle filter-based improved RAIM (Receiver Autonomous Integrity Monitoring) anti-deception jamming method. The invention relates to an improved RAIM anti-deception jamming method. For solving the problems of measurement failure of a single satellite, positioning misleading of a receiver by a control resolving flow, and neglecting of dependency and similarity among remaining vectors by RAIM, the invention provides a particle filter-based improved RAIM anti-deception jamming method. The particle filter-based improved RAIM anti-deception jamming method comprises the following steps: 1, forming a formula described in the specification; 2, obtaining a Rho n and three-dimensional coordinates of the satellite; 3, calculating a parameter described in the specification; 4, calculating y (m); 5, calculating w (m); 6, selecting wmax; 7, calculating a parameter described in the specification; 8, calculating a maximal visible satellite SLmax; 9, calculating a judgment threshold gamma; 10, judging the existence of a deception satellite; 11, estimating a sequence number of the deception satellite; and 12, if the mark F of the deception satellite is equal to 1, removing jamming, carrying out positioning resolving, and if F is not equal to 1, carrying out positioning resolving. The particle filter-based improved RAIM anti-deception jamming method is applied to the field of improved RAIM anti-deception jamming.

The invention discloses a method for realizing single-mode RAIM (Receiver Autonomous Integrity Monitoring) under a small number of visible satellites based on assistance of clock correction, which is a method for realizing single-mode RAIM under the condition that the number of the visible satellites is small in loop tracking. Clock correction prediction is carried out through a Newton interpolation model under the premise that the clock frequency of a receiver is stable, and detection and elimination of a fault satellite can be carried out under the condition that the number of the visible satellites is five, thereby improving the positioning precision, the continuity and the stability of the receiver. The method comprises the steps of: first, determining weight factor in weighted least squares through parameters such as a carrier-to-noise ratio and the like of satellite signals; then, carrying out RAIM availability detection through a false alarm rate, a missed alarm rate, an observation equation and a weight matrix, determining a detection threshold value by using a tolerant false alarm rate in a non-precision condition, and carrying out clock correction prediction for the receiver through the Newton interpolation model so as to realize detection and elimination of the fault satellite, and finally, carrying out analysis and comparison on a dilution of precision (DOP) after a clock correction auxiliary equation is added. The method disclosed by the invention can realize detection and elimination of the fault satellite under the condition that only one redundant satellite exists, reduces the space dilution of precision through the clock correction auxiliary model, and improving the positioning accuracy of the receiver and the system robustness.

A system and related methods of displaying receiver autonomous integrity monitoring (RAIM) information on a display element of an aircraft are provided. The method obtains geographic position data for the aircraft, accesses lateral map data corresponding to the geographic position data, obtains RAIM outage data, and renders a dynamic lateral map on the display element. The map is rendered in accordance with the geographic position data, the lateral map data, and the RAIM outage data, and the map includes a graphical representation of a map and a graphical representation of a RAIM outage region.

The invention discloses a satellite selection optimized advanced receiver autonomous integrity monitoring method, and belongs to the technical field of satellite navigation. Advanced receiver autonomous integrity monitoring is a receiver end fault diagnosis and integrity monitoring technology based on a multi-constellation satellite navigation system, ARAIM provides a more strict integrity level by receiving the observed quantity of a multi-constellation satellite, however, due to participation of too many satellites, a fault mode needing to be monitored is increased, and the protection levelis expanded; in addition, the satellite with the large prior fault probability can increase the fault probability. And the ARAIM availability is easily reduced under the condition. According to the ARAIM method based on satellite selection optimization provided by the invention, the space satellite constellation is optimized according to the geometric accuracy factor of the constellation, the fault prior probability of the satellite and the like, the ARAIM availability is improved, and the calculation complexity is simplified. The method is suitable for autonomous integrity monitoring application of the satellite navigation receiver, and the same idea is suitable for other signal systems adopting multi-hypothesis solution separation.

The invention discloses a position estimation optimization method for advanced receiver autonomous integrity monitoring. The invention puts forwards an optimization method for position estimation in allusion to the availability of advanced receiver autonomous integrity monitoring. When a positioning result obtained according to the traditional method in ARAIM (Advanced Receiver Autonomous Integrity Monitoring) does not satisfy an available criterion, a constellation weighted positioning result is adopted to replace the original positioning result within an allowable range of the positioning precision, and the protection level and effective monitoring threshold are recalculated. The method can reduce the difference in positioning precision of different constellations and improve the availability of ARAIM. The method has the characteristics of low computation complexity and good compatibility. The method is suitable for autonomous integrity monitoring of satellite navigation receivers, and the same idea is applicable to other signal systems adopting multiple hypothesis solution separation.

A system and method provides an Automotive Safety Integrity Level (ASIL) qualifier for Global Navigation Satellite System (GNSS) position and related values. Specifically, hardware platform diagnostics are executed on one or more platforms associated with a GNSS Position Sensor (GNSSPS) that calculates/obtains position and/or related values. Also, a Receiver Autonomous Integrity Monitoring (RAIM) algorithm is executed on the calculated/obtained position and/or related values. If the results both produce a “good” qualifier, the position and/or related values is assigned an ASIL qualifier of “good” and may be utilized by an ASIL rated system. If either of the qualifiers is a “bad” qualifier, the position and/or related values is assigned an ASIL qualifier of “bad” and cannot be utilized by the ASIL rated system. In addition, the inventive system and method may compute a probability associated with an integrity violation of the RAIM algorithm which may consider the probability of hardware failure.

The invention provides an advanced receiver autonomous integrity monitoring simulation evaluation method and device. The method comprises the following steps of: reading a configuration file, GNSS satellite data and ISM message data; through the analyzed GNSS satellite data and ISM message parameters, simulating an advanced receiver autonomous integrity monitoring (ARAIM) algorithm, and performingcalculation to obtain the protection level and positioning error of an aircraft; and evaluating an accuracy index test value, an availability index test value and an integrity index test value of theGNSS system according to the calculation result. The advanced receiver autonomous integrity monitoring simulation evaluation method is completely and systematically established, the ARAIM does not have an existing standard, an ARAIM standard environment is simulated for monitoring, and the whole simulation evaluation process is simple and easy to execute.

The invention provides a method and device for optimizing the protection level of advanced receiver autonomous integrity monitoring. The method comprises the steps of calculating global positioning information of a receiver and subset positioning information of a fault subset according to ISM information of a plurality of satellites; calculating the distribution of positioning estimation errors ofthe receiver and the distribution of detection statistics of the fault subset according to the global positioning information and the subset positioning information; if it is determined that the detection statistics pass the detection, calculating the optimized protection level according to an optimization function for minimizing the integrity risk, the distribution of the positioning estimationerrors and the distribution of the detection statistics; and if the ARIAM is judged to be available according to the optimized protection level, outputting a positioning result of the receiver. According to the method provided by the embodiment of the invention, whether different fault subsets pass detection or not is determined under unbalanced satellite geometric distribution, the integrity target under each satellite fault hypothesis is established, and the integrity risk caused by fault missing detection is reduced by taking the minimum integrity risk as the target.

The invention belongs to the field of satellite navigation receiver information processing, and particularly relates to an inertial information-assistant RAIM (Receiver Autonomous Integrity Monitoring) detection method, so as to solve the problems of satellite receiver positioning stability and reliability. The method mainly comprises steps: satellite capturing, tracking and synchronizing are carried out; parameters of the satellite after frame synchronization are taken; the satellite position velocity is calculated; least square solution is carried out; a least square pseudo range residual vector and the root mean square are calculated; the pseudo range residual between the receiver and the satellite is calculated; the obtained pseudo range residuals of satellites are ranked from large to small, and each four points serves as a combination from front to behind to calculate the root mean square of one pseudo range residual; a combination with the minimum root mean square of the pseudo range residual is found out; and the pseudo range residual of each satellite and a mean value are compared, and the satellite whose pseudo range residual is larger than a fault recognition threshold value is judged to be a failed satellite. Due to the method of the invention, channel tracking or satellite failure can be effectively detected in a condition with five satellites in a single system, and a failed satellite can be recognized.

The embodiment of the invention provides a receiver autonomous integrity monitoring and troubleshooting method based on student's t-distribution. The method comprises the steps of respectively calculating by adopting a student's t-distribution algorithm according to a plurality of satellite sets in an RAIM (Receiver Autonomous Integrity Monitoring) operation period to acquire a plurality of parity vectors, calculating a parity vector sample mean x-bar and a sample variance S of (m+1) sampling in a plurality of parity vector sets Samp1, calculating a test statistic T, comparing the test statistic T with a preset threshold TD, and determining whether there is a satellite with pseudo-range deviation in the satellite sets or not according to a comparison result; and if the satellite sets are determined to have no satellite with pseudo-range deviation, outputting a satellite set Setj without a deviation trouble, calculating a horizontal protection level HPL of the satellite set Setj without a deviation trouble, and determining whether a positioning result of the satellite set Setj without a deviation trouble meets performance requirements or not. The method provided by the invention makes full use of information between redundant receivers, and various system troubles including receiver noises can be monitored.