The pericenter advance of a test body by a central mass is one of the classical tests of General Relativity. To day this effect is measured with radar ranging by the perihelion shift of Mercury and other planets, in the gravitational field of Sun, with a relative accuracy of the order of 10–10. In this paper we explore the possibility of a measurement of the pericenter advance in the gravitatio...

Aiming at the requirement of the autonomous time synchronization in BeiDou Navigation Satellite System (BDS), an algorithm for inter-satellite autonomous time synchronization and ranging is proposed. Based on the establishment of the inter-satellite link length model of the BDS, a series of simulation has been carried out through the use of STK (Satellite Tool Kit), which includes the simulatio...

Recent advances in nonlinear fiber optics and compact pulsed lasers have resulted in creation of broadband directional light sources. These supercontinuum laser sources produce directional broadband light using cascaded nonlinear optical interactions in an optical fibre framework. This system is used to simultaneously measure distance and reflectance to demonstrate a technique capable of distin...

In this work, surface-enhanced Raman spectra of ten genomic DNAs extracted from leaf tissues of different grapevine (Vitis vinifera L.) varieties, respectively, are analyzed in the wavenumber range 300-1800 cm-1. Furthermore, structural changes induced in grapevine genomic nucleic acids upon femtosecond (170 fs) infrared (IR) laser pulse irradiation (λ = 1100 nm) are discussed in detail for sev...

Two important means of acquiring 3D models of real world scenes and objects are range scanners and stereovision systems. The first approach is usua lly implemented through laser-range mapping techniques, which result in dense depth maps, with relatively high accuracy. On the other hand, stereo methods reconstruct the scene geometry by finding corresponding points in two or more images, then tri...

• Laser vibration sensing has traditionally relied on limiters and &equencymodulation (FM) discriminators to process frequency-modulated laser radar returns. The performance of the traditional FM-discriminator approach can be limited by laser signature characteristics; both the temporal coherence of the laser and t~'get speckle can degrade the performance of an FM-discriminatorbased laser vibra...

Since 2015, China has successfully launched five experimental BeiDou global navigation system (BDS-3) satellites for expanding the regional system to global coverage. An initial performance assessment and characterization analysis of the BDS-3 is presented. Twenty days of tracking data have been collected from eleven monitoring stations. The tracking characteristics and measurement quality are ...

In a self-mixing type laser range finder the current of the laser is modulated with a triangle wave to produce a range of optical frequencies. However, the electrical signal does not produce a perfect linear sweep in optical frequency due to thermal and other effects in the laser. This leads to errors in the accuracy and resolution of the range finder. In this paper, we describe and implement a...