公开(公告)号：US11506498B2

公开(公告)日：2022-11-22

申请号：US16642083

申请日：2017-08-31

Applicant: SAAB AB

Inventor： Fredrik Dicander

IPC: G01C21/00

Abstract: The invention concerns a system (100) and a method for estimating the geographic position of a target (1). The method comprises the following steps: detecting a target (1); determining the characteristics of the target (1), which characteristics at least comprise a geographic position (3) and a category of the target; tracking the detected target (1) until at least one certain predetermined criteria is not fulfilled, wherein said criteria is associated to the level of certainty for determining the geographic position (3) of the target (1). The method further comprises determining a first point in time t1 when the predetermined criteria was last fulfilled, wherein, for a second point in time t2 the following step is performed: creating a pattern (2) defining at least one possible geographic position (3) of the target (1), said pattern (2) extends at least partially around the geographic position (3) of the target (1) at t1, wherein the dimension of said pattern (2) is determined based on at least one predetermined parameter.

公开(公告)号：US10853644B2

公开(公告)日：2020-12-01

申请号：US16642862

申请日：2017-08-31

Applicant: SAAB AB

Inventor： Fredrik Dicander

IPC: G06K9/00 ,  G01C15/00 ,  G01C7/00

Abstract: A sensor surveillance system (100) and a method for determining possible geographic positions of at least one assumed undetected target (1a-n) within a geographic volume of interest (200) is provided, wherein for a first point in time ti the following steps are performed: dividing the geographic volume of interest (200) into sections (10); assuming the existence of an assumed undetected target (1a-n) at a geographic position within each section (10); and initiating the creation of a pattern (2) defining at least one possible geographic position of the assumed undetected target, said pattern extends at least partially around the geographic position of the assumed undetected target (1a-n); wherein the geographic extension of said pattern is determined based on: the category of the assumed undetected target (1a-n); and the amount of time that has passed from the first point in time t1. Further, for a second point in time t2 the following steps are performed: determining geographic locations (205) within said geographic volume of interest (200) from where sensor signals show absence of targets; and removing the pattern (2) from the geographic locations (205) from where sensor signals show absence of targets.