Space debris poses an increasing threat to space assets, and accurate, affordable tracking of all space objects is necessary to maintain efficient and safe space operations. Tracking space objects of very small sizes using GNSS bistatic radar has been proposed as a potential solution. Previous research efforts have discussed various aspects of the signal processing required for debris tracking ...

Extended Kalman filter (EKF) is widely used for tracking moving objects like missiles, aircrafts, robots etc. In this paper we examine the case of a single sensor or observer bearing only tracking (BOT) problem for two different models. In model 1, the target is assumed to have a constant velocity and constant course. In model 2, the target is assumed to follow a coordinated turn model with con...

A new approach to rejecting interference between sonar systems is presented in this paper. The approach is based on identifying a transmitter by sending a double pulse with known separation. Using simple delayed pulse subtraction, a sonar receiver can test echo pulses quickly and simply for acceptance. This approach is implemented on a sonar system that is capable of accurately tracking objects...

Phase scintillation caused by propagation through irregularities in the solar wind, ionosphere, and troposphere, introduces noise in spacecraft radio science experiments. In precision Doppler tracking observations, scintillation can be the dominant noise source; statistics of this propagation noise are necessary for experiment planning and in design of optimum signal processing procedures. Here...

Background In patients with abnormal uterine bleeding, transvaginal ultrasound (TVS) is the first-line diagnostic approach to exclude endometrial pathology. If a thickened endometrium suggests endometrial pathology, sonohysterography, office hysteroscopy or dilatation and curettage are the second-line tests preferred, depending on availability and on the suspected pathology, to exclude malignan...

This paper mainly studies angle-measurement based data association algorithm to overcome the existing problems in the applications of traditional association approaches for bearing-only target locating and tracking system. First, this paper proposes a fast track initiation approach for the system using a single passive sensor. In this approach, the rules of screening out threatening targets are...

In this paper, we describe an automatic storm tracking system to help with the forecasting of severe storms. The concepts fuzzy point, fuzzy vector, fuzzy length of a fuzzy vector, and fuzzy angle between two non-zero fuzzy vectors are rst examined. We use a region splitting algorithm with dynamic thresholding to determine storm masses in Doppler radar intensity images. We represent the center ...