Search NASA⌕ Search
Home/Archive/DOE OSTI

DOE OSTI · 2540203

The Relationship Between Different VSAR Doppler Resolutions

Haydon, Tucker Caelan Ellis [Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)] (ORCID:0009000082092487)
View original source ↗Read source document ↗Export metadata ↓

Abstract

It is often useful to think of the Doppler resolution of a vertical synthetic aperture radar in terms of the distance spanned by a resolution cell on the ground in unit meters, yet Doppler shift is fundamentally a measure of frequency, so there is a disconnect. This memo derives relationships between frequently invoked Doppler resolution expressions when they are expressed in ground-projected units (meters), angular units (radians), range-rate units (meters/second), and frequency units (Hertz).

Explore related subjects

47 OTHER INSTRUMENTATION97 MATHEMATICS AND COMPUTING

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

Haydon, Tucker Caelan Ellis [Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)] (ORCID:0009000082092487). 2025-03-01. The Relationship Between Different VSAR Doppler Resolutions. https://doi.org/10.2172/2540203

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related reports

DOE OSTI2026

High Multiplicity Trigger for long-lived particles in CMS detector

Searches for long-lived particles (LLPs) at the CMS experiment often involve unconventional event topologies that are difficult to efficiently select using standard trigger strategies. To improve sensitivity to such signatures during LHC Run 3 operation, a dedicated High Multiplicity Trigger (HMT) has been developed and deployed in the CMS trigger system. The trigger targets events containing unusually large numbers of hits in the CMS cathode strip chamber (CSC) muon detectors, a characteristic signature of several LLP scenarios involving displaced decays in the muon system. The HMT implementation, trigger logic, rate dependence with pileup, and operational stability are described. Optimized hit multiplicity thresholds are used to maintain acceptable trigger rates under high-luminosity and high-pileup conditions while preserving high efficiency across a broad range of LLP lifetimes and kinematic regimes. The trigger performance is evaluated using both simulated event samples and proton-proton collision data collected during Run 3 of the LHC. The HMT substantially extends the CMS sensitivity to non-standard signatures associated with LLP decays and provides a flexible platform for future searches for physics beyond the Standard Model.

47 OTHER INSTRUMENTATION↗