Abstract: In an audio spot formation device D including a speaker unit 1 and a support stand 2 that supports the speaker unit 1, the speaker unit 1 includes a plurality of parametric speakers 1a, 1b, 1c and 1d that divide a sound wave into a carrier wave and a sideband wave and radiate the carrier wave and the sideband wave, and a speaker disposition unit 10 in which the plurality of speakers 1a, 1b, 1c and 1d are disposed, the speaker disposition unit 10 is attached to the support stand 2 at a support unit P, at least one of a height of the support stand 2, an angle of attachment of the speaker disposition unit 10 at the support unit P and a direction of at least one parametric speaker of the plurality of parametric speakers 1a, 1b, 1c and 1d is adjustable, and a position at which an audio spot is formed is adjusted via the adjustment.

Abstract: An audio spot forming system (S) is an audio spot forming system which transmits an alert sound to a vehicle traveling on a road, the audio spot forming system including a first parametric speaker (1) configured to emit a sideband wave, and a second parametric speaker (2) configured to emit a carrier wave, in which the sideband wave and the carrier wave are caused to intersect with each other on the road to form an audio spot.

Abstract: An absolute coordinate acquisition method is an absolute coordinate acquisition method for acquiring absolute coordinates of an underground pipeline, the method including: a marking step S101 of setting a plurality of reference points on a road surface and setting a measurement point on a pipeline installed inside an excavated ditch; a measurement step S102 of measuring absolute coordinates of the reference points; a relative position calculation step (S103 to S105) of calculating relative positions of the reference points and the measurement point to a reference position; and an absolute coordinate calculation step S106 of calculating absolute coordinates of the measurement point based on the absolute coordinates of the reference points and the relative positions of the reference points and the measurement point.

Abstract: A positioning terminal is provided and identifies, as appropriate, a satellite to be excluded, thereby improving positioning accuracy. A processor acquires a signal-to-noise ratio (SNR) and an angle of elevation for each satellite. The processor next identifies a satellite for which the SNR is less than a shielding SNR mask as a multipath satellite and selects the satellite to be excluded. The processor next generates positioning terminal positioning data using a positioning signal from satellites other than the satellite to be excluded. The processor next uses reference station positioning data and positioning terminal positioning data of the selected satellite to execute an RTK calculation.

Abstract: An audio spot forming system (S) is an audio spot forming system which transmits an alert sound to a vehicle traveling on a road, the audio spot forming system including a first parametric speaker (1) configured to emit a sideband wave, and a second parametric speaker (2) configured to emit a carrier wave, in which the sideband wave and the carrier wave are caused to intersect with each other on the road to form an audio spot.

Abstract: In an audio spot formation device D including a speaker unit 1 and a support stand 2 that supports the speaker unit 1, the speaker unit 1 includes a plurality of parametric speakers 1a, 1b, 1c and 1d that divide a sound wave into a carrier wave and a sideband wave and radiate the carrier wave and the sideband wave, and a speaker disposition unit 10 in which the plurality of speakers 1a, 1b, 1c and 1d are disposed, the speaker disposition unit 10 is attached to the support stand 2 at a support unit P, at least one of a height of the support stand 2, an angle of attachment of the speaker disposition unit 10 at the support unit P and a direction of at least one parametric speaker of the plurality of parametric speakers 1a, 1b, 1c and 1d is adjustable, and a position at which an audio spot is formed is adjusted via the adjustment.

Abstract: An absolute coordinate acquisition method is an absolute coordinate acquisition method for acquiring absolute coordinates of an underground pipeline, the method including: a marking step S101 of setting a plurality of reference points on a road surface and setting a measurement point on a pipeline installed inside an excavated ditch; a measurement step S102 of measuring absolute coordinates of the reference points; a relative position calculation step (S103 to S105) of calculating relative positions of the reference points and the measurement point to a reference position; and an absolute coordinate calculation step S106 of calculating absolute coordinates of the measurement point based on the absolute coordinates of the reference points and the relative positions of the reference points and the measurement point.

Abstract: A positioning terminal is provided and identifies, as appropriate, a satellite to be excluded, thereby improving positioning accuracy. A processor acquires a signal-to-noise ratio (SNR) and an angle of elevation for each satellite. The processor next identifies a satellite for which the SNR is less than a shielding SNR mask as a multipath satellite and selects the satellite to be excluded. The processor next generates positioning terminal positioning data using a positioning signal from satellites other than the satellite to be excluded. The processor next uses reference station positioning data and positioning terminal positioning data of the selected satellite to execute an RTK calculation.