Passive Positioning of Flying Object With Microwave Signals From LEO Satellites: Concept and Preliminary Simulation Results

Abstract

Along with the deployment of low earth orbit (LEO) satellite constellations for global Internet services, Ku, Ka or V band microwave signals will be available from space anywhere on Earth. Utilizing the signals, a new approach to positioning flying objects passively is proposed, and a diffraction model to characterize the impact of the flying object on the intensity of the received signals is presented. A linear Minimum Mean Squared Error (MMSE) based estimator is then employed to position the flying object passively. Preliminary 2D simulation results are used to validate the effectiveness of the proposed method. INDEX TERMS Low earth orbit satellites, microwave propagation, passive microwave remote sensing.

Doppler Analysis of Forward Scattering Radar With Opportunistic Signals From LEO Satellites

“…With the use of ( 5), ( 6), ( 8), (9), and (11), the Doppler shift due to a point (x ′ , z ′ ) on the flying object is given by (12), where dη(t) dt can be computed using (13).…”

“…Along with the deployment of Low Earth Orbit (LEO) satellite constellations for global Internet services such as Starlink, more and more Ku, Ka, and V band microwave signals will be available from the sky for communications. We have recently proposed to use such signals opportunistically to retrieve things in the sky, such as rainfall [8] and flying objects [9], with a ground-based FS passive radar setup. As pointed out in [8], [9], advantages of such systems include low cost, availability of abundant opportunistic sources, and the networking capability.…”

“…We have recently proposed to use such signals opportunistically to retrieve things in the sky, such as rainfall [8] and flying objects [9], with a ground-based FS passive radar setup. As pointed out in [8], [9], advantages of such systems include low cost, availability of abundant opportunistic sources, and the networking capability. Doppler analysis is critical for detection and imaging with radars.…”

Forward Scatter Shadow Ratio: Concept and Its Application in Shadow Profile Retrieval

“…The opportunistic use of signals form a network of a large number of LEO satellites can potentially serve monitoring purposes such as measuring rain and cloud [21], [22], [23]. It has been proposed that these signals can be used as IOs in an FSR setup for flying object detection [24] and for space debris tracking and imaging [24], [25], [26], [27], [28].…”