Tracking Error Modeling in Presence of Satellite Imperfections

Code Tracking Error in the Presence of Interference Signal

The performance of a code tracking loop for a spread spectrum signal can be severely deteriorated in the presence of an interference signal. The interference signal is modeled as a signal with the same code but with a different delay and carrier frequency. The variance of the tracking delay error is derived in terms of loop bandwidth, chip duration, the interference and signal power and bandpas...

Modeling and Simulation of Micromachined Gyroscopes in The Presence of Imperfections

This paper studies behavior of non-ideal vibratory micromachined gyroscopes. The use of methods of motion decomposition [1] is the essence of the proposed analytical approach. The method is based on partitioning the equations of motion on fractions which are changing in di erent time scales. The approach allows rapid simulation of the long-term response of the gyroscope in presence of imperfect...

TW-TOA based positioning in the presence of clock imperfections

This paper studies the positioning problem based on two-way time-of-arrival (TW-TOA) measurements in asynchronous wireless sensor networks. Since the optimal estimator for this problem involves difficult nonconvex optimization, we propose two suboptimal estimators based on squared-range least squares and least absolute mean of residual errors. The former approach is formulated as a general trus...

Participatory Development In The Presence Of Endogenous Community Imperfections

Satellite Tracking of Wildlife

small satellite-based tracking system that is light enough to be carried on birds was developed in the 1980s at the Applied Physics Laboratory. A new, more capable generation is now under development that will contain, in addition to the Argos tracking platform transmitter terminal, a global positioning system receiver and a complement of advanced sensors. The sensors may include a digital audi...