Detecting system, detecting apparatus, detecting method, and program

1 . A detecting system comprising:

a tag;

a radar device, comprising one or more processors, configured to transmit transmission radio waves to the tag and to acquire reception radio waves produced by the transmission radio waves being reflected or scattered by the tag; and

a detecting apparatus connected to the radar device, wherein

the tag includes

a pattern made of a plurality of materials that reflect or scatter radio waves received from the radar device, the pattern including a known pattern known to the detecting apparatus and an unknown pattern unknown to the detecting apparatus,

wherein the radar device is configured to transmit first transmission radio waves and receive first reception radio waves produced by the first transmission radio waves being reflected or scattered by the tag,

the detecting apparatus includes

a specifying unit, comprising one or more processors, configured to calculate based on the first reception radio waves, a relative velocity between the radar device and the tag, with which the known pattern can be detected from the first reception radio waves, and to specify a condition for the radar device to transmit second transmission radio waves for estimating the unknown pattern, from the calculated relative velocity, and

a notification unit, comprising one or more processors, configured to notify the radar device of the specified condition, and

the radar device transmits the second transmission radio waves to the tag under the condition.

2 . The detecting system according to claim 1 , wherein

the detecting apparatus further includes

an estimation unit, comprising one or more processors, configured to estimate the unknown pattern from second reception radio waves produced by the second transmission radio waves transmitted under the condition being reflected or scattered by the tag.

3 . The detecting system according to claim 1 , wherein

if the tag is fixed,

the relative velocity calculated by the specifying unit is a velocity of the radar device.

4 . The detecting system according to claim 1 , wherein

if the tag moves,

the specifying unit is further to acquire a velocity of the radar device, and calculate a velocity of the tag from the acquired velocity of the radar device and the relative velocity.

5 . The detecting system according to claim 4 , wherein

if the tag floats in an environment, a velocity of the tag is a movement velocity of the environment in which the tag is located.

6 . The detecting system according to claim 1 , wherein

the radar device is configured to perform sensing at a higher frequency in order to detect the first reception radio waves than in order to detect second reception radio waves for the second transmission radio waves.

7 . The detecting system according to claim 1 , wherein

the second transmission radio waves are vertically polarized waves and

the specifying unit is configured to specify the condition related to an irradiation timing to apply the vertically polarized waves, from the relative velocity between the radar device and the tag such that the radar device applies the vertically polarized waves at a distance interval of ½ of the wavelength of the vertically polarized waves.

8 . A detecting apparatus comprising:

one or more processors, configured to:

receive a first reception radio waves produced by a first transmission radio waves transmitted by a radar device being reflected or scattered by a tag including a pattern made of a plurality of materials that reflect or scatter received radio waves, the pattern including a known pattern known to the detecting apparatus and an unknown pattern unknown to the detecting apparatus;

calculate a relative velocity between the radar device and the tag based on the first reception radio wave;

specify a condition for the radar device to transmit a second transmission radio waves for estimating the unknown pattern, from the calculated relative velocity; and

notify the radar device of the specified condition.

9 . A detecting method in a detecting system including a tag, a radar device, and a detecting apparatus connected to the radar device, in which the tag including a pattern made of a plurality of materials that reflect or scatter radio waves received from the radar device, the pattern including a known pattern known to the detecting apparatus and an unknown pattern unknown to the detecting apparatus, the detecting method comprising:

transmitting, by the radar device, first transmission radio waves;

receiving, by the radar device, first reception radio waves produced by the first transmission radio waves being reflected or scattered by the tag;

calculating, by the detecting apparatus and based on the first reception radio wave, a relative velocity between the radar device and the tag, with which the known pattern can be detected from the first reception radio waves, and specifying a condition for the radar device to transmit second transmission radio waves for estimating the unknown pattern, from the calculated relative velocity;

notifying, by the detecting apparatus, the radar device of the specified condition; and

transmitting, by the radar device, second transmission radio waves to the tag under the condition.

10 . A non-transitory, computer-readable medium storing one or more instructions executable by a computer to perform operations as the detecting apparatus according to claim 8 .