A Comparative Analysis of Multi-Epoch Double-Differenced Pseudorange Observation and Other Dual-Satellite Lunar Global Navigation Systems

In this study, dual-satellite lunar global navigation systems that consist of a constellation of two navigation satellites providing geo-spatial positioning on the lunar surface were compared. In our previous work, we proposed a new dual-satellite relative-positioning navigation method called multi-epoch double-differenced pseudorange observation (MDPO). While the mathematical model of the MDPO and its behavior under specific conditions were studied, we did not compare its performance with other dual-satellite relative-positioning navigation systems. In this paper, we performed a comparative analysis between the MDPO and other two dual-satellite navigation methods. Based on the difference in their mathematical models, as well as numerical simulation results, we developed useful insights on the system design of dual-satellite lunar global navigation systems.

GNSS-technologies in testing automotive ADAS-system

In this article modern technologies are reviewed, they are used in testing ADAS systems, the principle of which is based on the use of global navigation systems (GNSS) and the using of differential corrections. The specialists of the Nizhny Novgorod State Technical University n. a. R. E. Alekseev have developed a schematic diagram in which Racelogic measuring equipment is used. The performance of the testing system was verified during tests of a bus based on a light commercial vehicle GAZelle Next while simulating the operation of the adaptive cruise control function. In the conclusion, graphs of a number of measured parameters are presented, the nature of the change in time confirms the correct functioning of the measuring equipment. Keywords: GNSS, Glonass, GPS, ADAS, testing, radiocommunication, RTK

The PPP data processing algorithm to create geodetic networks

The article deals with determination of coordinates using global navigation systems, and application of the PPP data processing algorithm to obtain coordinates. The authors conducted an experiment illustrating the algorithm accuracy.

Synchronous Addition of Antenna Field Signals with a Shift of Sampling Pulses during Spacecraft Tracking by Target Designations with Allowance for the Inertia of Antenna Motion

The method of synchronous addition of signals of separate antennas was proposed previously for the aggregation of relatively small-scale aperture antennas into a single digital antenna array (digital antenna field) with a combined area for receiving telemetry signals from spacecraft when antennas are mutually spaced by a distance big enough for them not to shade one another. The method is based on the idea of compensating mutual delays between the antennas of the received signal by a corresponding shift of the sampling pulses of the signals of different antennas. The present paper demonstrates the efficacy of the method in the mode of spacecraft tracking by target designations in orbits of global navigation systems with allowance for the inertia of antenna motion. It is shown that in spacecraft tracking mode, which is close to the real one, this method gives a signal-to-noise ratio and bit-error probability closer to the theoretical limit than the values obtained for the idealized mode (analyzed earlier), which equates the angular coordinates and velocities of the antennas to the calculated angles and velocities of spacecraft in target designation nodes.

Model of an alternative navigation system for high-precision weapons

The article explores the problem of alternative navigation support for high-precision weapons that use guidance based on signals from global navigation systems. It proposes the use of an autonomous navigation system replacing satellite navigation in the case where major Global Positioning System-like systems are unavailable. It suggests the idea and the model of a moving navigation field that can move along the weapon trajectory. The model of accuracy for the pseudolite navigation system uses the least squares method as its basis. The study looks into the accuracy parameters of the moving navigation field. The results of the study show the advantages of a moving field when compared with a stationary navigation field in case of autonomous use. This research also shows the possibility of using an autonomous system for Special Forces, search and rescue operations, and robotic and unmanned aerial, ground, and sea-based vehicles.

Synchronous Addition of Antenna Signals with a Shift of Sampling Pulses in Idealized Mode of Spacecraft Tracking by Target Designations

The method of synchronous addition of signals of separate antennas was proposed previously for the aggregation of relatively small-scale aperture antennas into a single digital antenna array (digital antenna field) with a combined area for receiving telemetry signals from spacecraft. In this case, the antennas are mutually spaced by a big enough distance in order to not shade one another. The method is based on the idea of compensating the mutual delays between the antennas of the received signal by a corresponding shift of the sampling pulses of the signals of different antennas. This article demonstrates the method’s workability in idealized mode of spacecraft tracking by target designations on orbits of global navigation systems. It is shown that with the up-to-date level of impulse technology development the method of synchronous addition of antenna signals with a shift of sampling pulses is potentially capable of ensuring the reception of telemetry information from deep-space spacecraft at rates approximately 6 times higher than those of the classic Delta-DOR method.

Method for continuous individual correction of vehicles` maintenance interval

The article considers the existing methods of correcting the vehicles` maintenance interval. Based on the analysis of modern features of road transport operation, some disadvantages are shown. The authors provide a developed method of continuous individual correction, which allows calculating the rational maintenance interval individually for the vehicle based on information about the conditions under which its operation is carried out. The use of information about the geographical coordinates of the vehicle obtained using global navigation systems for the implementation of the developed method is considered. Calculation formulas and algorithm are provided. Recommendations for improving the developed method and the direction of further research are offered.