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1. (WO2019045608) THE DESCRIBED INVENTION IS A METHOD AND A SYSTEM FOR DETERMINING POSSIBLE GEOGRAPHIC POSITIONS OF AT LEAST ONE ASSUMED UNDETECTED TARGET WITHIN A GEOGRAPHIC VOLUME OF INTEREST
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CLAIMS

1. A method for determining possible geographic positions of at least one assumed

undetected target (la-n) within a geographic volume of interest (200),

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 (la-n) at a geographic position (pia-id) within each section (10); and

initiating the creation of a pattern (2) defining at least one possible geographic position of the assumed undetected target (la-n), said pattern (2) extends at least partially around the geographic position (Pia-id) of the assumed undetected target (la-n);

wherein the geographic extension of said pattern (2) is determined based on:

- the category of the assumed undetected target (la-n); and

- the amount of time that has passed from the first point in time ti; wherein, 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.

2. The method according to claim 1, wherein the method according to claim 1 is

performed repeatedly, and for each further first point in time ti, subsequent the first point in time ti, new sections (10) are only assumed along the border of the geographic volume of interest (200).

3. The method according to any of claim 1 or 2, wherein, at each point in time

subsequent the first point in time ti, the following steps are performed:

- comparing the properties of each pattern (2); and

merging the parts of the patterns (2) for which the comparison fulfils a predetermined criteria.

The method according to any of claim 1 to 3, wherein a separate pattern (2) is created for each category of the assumed undetected target (la-n).

The method according to any of claim 1 to 4, wherein blind spots (205) within the geographic volume of interest (200) are determined based on the pattern (2).

The method according to any of claim 1 to 5, wherein the geographic extension of said pattern (2) is further based on:

- the characteristics of the surrounding of the geographic position (pia n) of the assumed undetected target (la-n) at each point in time.

The method according to any of claim 1 to 6, wherein the category of the assumed undetected target (la-n) is one of the following: human; land borne vehicle;

waterborne vehicle; or airborne vehicle.

The method according the any of the preceding claims, wherein at least one sensor (300a-n) of a sensor surveillance system (100) is controlled based on the pattern (2a-n).

The method according to claim 8 wherein at least one sensor (300a-n) of the sensor surveillance system (100), is controlled to scan a certain geographic volume, at least at said geographic positions where a pattern (2) of an assumed undetected target (la-n) is present.

The method according to any of the preceding claims, wherein the method further comprises the following step:

- calculating a probability of the presence of an assumed undetected target (la-n) for at least one part (50) of the pattern (2) at each point in time.

11. The method according to claim 10, wherein the probability of the presence of an assumed undetected target (la-n) for the at least one part (50) of the pattern (2) is based on:

- the category of the assumed undetected target (la-n); and/or

- the surrounding of the geographic position (pia-n) where the assumed undetected target (la-n) is assumed to be situated at each point in time

- the ability of the sensor (300a-n) in the sensor surveillance system

scanning a certain geographic volume to detect an assumed undetected target (la-n) in said geographic volume.

12. The method according to a claim 11 wherein at least one sensor (300a-n) of a sensor surveillance system (100) is controlled based on the calculated probability of the presence of an assumed undetected target (la-n, la,-^) associated with each part of the pattern (2).

13. The method according the any of the preceding claims, wherein the geographic

positions of a pattern (2a-n, 2ai-n,) for an assumed undetected target (la-n) are related to a grid.

14. A sensor surveillance system (100) arranged to determining possible geographic

positions of at least one assumed undetected target (la-n) within a geographic volume of interest (200) comprising:

a central control unit (250); and

at least one sensor (300a-n) arranged to scan and detect targets in a certain geographic volume within the geographic volume of interest (200) wherein said central control unit (250) is arranged to at a first point in time ti perform the following steps:

dividing the geographic volume of interest (200) into sections (10);

assuming the existence of an assumed undetected target (la-n) at a geographic position (pia-id) within each section (10); and

initiating the creation of a pattern (2a-n) defining at least one possible geographic position of the assumed undetected target (la-n), said pattern (2a-n) extends at least partially around the geographic position (Pia-id) of the assumed undetected target (la-n);

wherein the geographic extension of said pattern (2a-n) is determined based on:

- the category of the assumed undetected target (la-n); and

- the amount of time that has passed from the first point in time ti;

wherein said central control unit (250) is arranged to at a second point in time t2 perform the following steps:

determining geographic locations (205) within said geographic volume of interest (200) from where the signals from the sensor (300a-n) show absence of targets; and

removing the pattern (2a-n) from the geographic locations (205) from where the signals from the sensor (300a-n) show absence of targets.

The sensor surveillance system (100) according to claim 14, wherein the central control unit (250) is arranged to perform the steps according to claim 15 repeatedly, wherein the central control unit (250) is further arranged to, for each further first point in time ti, subsequent the first point in time ti, new sections (10) are only assumed along the border of the geographic volume of interest (200).

The sensor surveillance system (100) according to claim 14 or 15, wherein the central control unit (250) is arranged to, at each point in time subsequent the first point in time ti, perform the following steps:

- comparing the properties of each pattern (2); and

merging the parts of the patterns (2) for which the comparison fulfils a predetermined criteria.

The sensor surveillance system (100) according to claim 14 to 16, wherein the central control unit (250) is arranged to create a separate pattern (2) for each category of the assumed undetected target (la-n).

The sensor surveillance system (100) according to any of claim 14 to 17, wherein the central control unit (250) is arranged to determine blind spots within the geographic volume of interest (200) based on the pattern (2).

The sensor surveillance system (100) according to any of claim 14 to 18, wherein the central control unit (250) is arranged to further base the geographic extension of said pattern (2) on:

- the characteristics of the surrounding of the geographic position (pia-n) of the assumed undetected target (la-n) at each point in time.

The sensor surveillance system (100) according to any of claim 14 to 19, wherein the category of the assumed undetected target (la-n) is one of the following: human; Ian borne vehicle; waterborne vehicle; or airborne vehicle.

21. The sensor surveillance system (100) according the any of claim 14 to 20, wherein the central control unit (250) is arranged to control at least one sensor (300a-n) of the sensor surveillance system (100) based on the pattern (2).

22. The sensor surveillance system (100) according to any of claim 14 to 21 wherein the central control unit (250) is arranged to control at least one sensor (300a-n) of the sensor surveillance system (100), to scan a certain geographic volume, at least at said geographic positions where a pattern (2) of an assumed undetected target (la-n) is present.

23. The sensor surveillance system (100) according to any of claim 14 to 22 wherein the central control unit (250) is arranged to perform the following step:

- calculating a probability of the presence of an assumed undetected target (la-n) for at least one part (50) of the pattern (2) at each point in time.

The sensor surveillance system (100) according to claim 23, wherein the central control unit (250) is arranged to base the calculations of the probability of the presence of an assumed undetected target (la-n) for the at least one part (50) of the pattern (2) on:

- the category of the assumed undetected target (la-n); and/or

- the surrounding of the geographic position (pia.n) where the assumed undetected target (la-n, lai-n,) was assumed to be situated at said first point in time ti, ti,; and/or

- the ability of the sensor (300a-n) in the sensor surveillance system scanning a certain geographic volume to detect an assumed undetected target (la-n) in said geographic volume.

The sensor surveillance system (100) according to any of claim 23 or 24, wherein the central control unit (250) is arranged to control at least one sensor (300a-n) of a sensor surveillance system (100) based on the calculated probability of the presence of an assumed undetected target (la-n, lai-n,) associated with each part of the pattern (2).

26. The sensor surveillance system (100) according to any of claims 14 to 25, wherein the central control unit (250) is arranged to relate the geographic positions of the pattern (2a-n, 2ai-rij) for an assumed undetected target (la-n, larni) to a grid.