The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 22, 2022
Filed:
Jun. 08, 2019
Robert Dickerman, Northfield, MA (US);
Robert Dickerman, Northfield, MA (US);
Other;
Abstract
Devices and methods are provided for determining frequency spectra, as well as the polarity of frequency, of energy in quadrature signals. In Doppler detection systems, found in sonar, radar, lidar, optical velocimeters using interferometers, and ultrasonics applications, for example, this information can be used to determine target speed and direction. Embodiments obtain a quadrature signal and determine a sine transform of a cross correlation between the I and Q components of the quadrature signal, and can provide an output comprising a signed frequency spectrum. A sign of a sample of the signed frequency spectrum can correspond to a polarity of frequency. The signed frequency spectrum can be rapidly determined over a unipolar frequency span that may be only approximately half the baseband sampling frequency. The signed frequency spectrum may be impervious to imaging under severe conditions of uncorrected quadrature amplitude imbalance.