JPH0643583U - Underwater position measurement system using pinger - Google Patents

Abstract

(57) [Abstract] [Purpose] An underwater position measurement system that can easily detect the position of a pinger. [Structure] It is composed of a pinger 10 and an underwater position measuring device 20, and the pinger has a transmitter 14 for transmitting first and second ultrasonic waves having first and second frequencies, respectively, from a transmitter 11. The underwater position measuring device receives the first and second ultrasonic waves from the pinger via the wave receiver 21, and outputs a first and a second reception output, and a first reception unit 22. An SSBL processing unit 23 that applies SSBL processing to the output to detect the direction in which the Pinger is present, and level detection units 24 and 25 that detect the reception levels of the first and second ultrasonic waves from the first and second reception outputs. And the distance calculation units 26 and 27 that calculate the distance to the pinger from the difference between the detected reception levels of the first and second ultrasonic waves, and the direction and the distance calculation unit in which the SSBL processing unit detects the pinger. Position of pinger from calculated distance And a display unit 28 for displaying.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an underwater position measuring system, and in particular, using an underwater position measuring device mounted on a vessel or the like, a signal from a pinger installed in water is received and the position of the vessel or the like is detected by detecting the position of the pinger. Determining an underwater position measurement system.

[0002]

[Prior art]

 Conventionally, in this type of underwater position measuring system, the direction in which the pinger is present was detected by the underwater position measuring device, but the distance to the pinger was hardly detected. One method that has been tried in the past is to receive a sound of a certain frequency emitted by a pinger, measure the amount of attenuation of that sound, and calculate the distance. However, this method is far from practical use due to the large error and variation in the measurement distance due to the influence of the sound propagation path in water and the fluctuation of the transmitted sound pressure of the finger itself.

[0003]

[Problems to be solved by the device]

 The above-mentioned conventional underwater position measuring system has been able to detect the direction in which the pinger is present, but it has been difficult to detect the distance to the pinger.

In view of the above problems, it is an object of the present invention to provide an underwater position measuring system capable of easily detecting the direction in which a pinger is present and the distance to the pinger.

[0005]

[Means for Solving the Problems]

 There are two types of attenuation of underwater sound: diffuse attenuation and absorption attenuation.In diffusion attenuation, the difference due to the frequency of the underwater sound does not occur. It decreases in proportion to. Both are generally expressed by the following equations (1) and (2), and the sum of the two is the total attenuation.

Diffusion attenuation = 20 log R (1) where R is the distance from the pinger (m) Absorption attenuation (α) = {40f ² / (4100 + f ² ) } + 0.1f ² / (1 + f ² ) + 0.000275f ² +0.003 (2) Based on this principle, the first and second ultrasonic waves with different frequencies are transmitted from the pinger, and their attenuation amounts The distance to the pinger can be detected by detecting the difference. Moreover, since the direction in which the pinger is present can be detected more easily than either the first or second ultrasonic wave by using the SSBL that has been conventionally known, the first and second ultrasonic waves transmitted from the pinger at a constant cycle. When used in combination with the distance calculated from the second ultrasonic wave, the position of the pinger or the position of the own ship can be accurately detected.

Therefore, the underwater position measuring system of the present invention comprises a pinger and an underwater position measuring device, wherein the pinger has first and second frequencies having first and second frequencies, respectively. The underwater position measuring device has a transmitting unit for transmitting ultrasonic waves from a wave transmitter, and receives the first and second ultrasonic waves from the pinger through a wave receiver, From the first and second reception outputs, and a reception unit that outputs the reception output of the first reception output, an SSBL processing unit that applies the SSBL processing to the first reception output, and detects the direction in which the pinger is present. The SSBL processing unit includes a level detection unit that detects the reception level of ultrasonic waves, a distance calculation unit that calculates the distance to the pinger from the difference between the reception levels of the first and second ultrasonic waves detected by the level detection unit, and the SSBL processing unit. The direction and the direction of the detected pinger And a display unit that displays the position of the pinger from the distance calculated by the distance calculation unit. Further, preferably, the pinger sends the first and second ultrasonic waves from the transmitter at the same level, and the distance calculation unit changes according to the traveling distances of the first and second ultrasonic waves. The difference between the levels of the first and second ultrasonic waves to be converted is stored, and the difference between the levels of the first and second ultrasonic waves that is the same as the difference between the reception levels of the first and second ultrasonic waves is stored as Calculate the distance to Pinger. Alternatively, instead of the level difference, the level ratio is used to calculate the distance to the pinger.

[0008]

[Action]

 The higher the frequency of the first and second ultrasonic waves transmitted from the pinger, the faster they are attenuated. The distance calculation unit calculates the distance to the Pinger from the difference or ratio of the reception levels of the first and second ultrasonic waves detected by the level detection unit. The display unit displays the position of the pinger based on the direction in which the pinger is detected by the SSBL processing unit and the distance to the pinger calculated by the distance calculation unit.

[0009]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings. 1 is a block diagram showing an underwater position measuring system of the present invention, and FIG. 2 is a characteristic diagram for explaining the operation of the embodiment of FIG. The underwater distance measuring system of this embodiment includes a pinger 10 and an underwater distance measuring device 20.

The pinger 10 transmits a signal of a first frequency for a time T1 after transmitting a signal of a first frequency for a time T1 with a wave transmitter 11, timers 12, 13 for setting a time T1, T2. And a transmitter 14 for transmitting and transmitting ultrasonic waves of respective frequencies from the transmitter 11.

The underwater position measuring device 20 includes a receiving unit 22 that outputs a reception output that receives the ultrasonic wave from the pinger 10 via a receiver 21, and a reception output of the first frequency of the reception output. , An SSBL processing unit 23 that detects the direction in which the Pinger 10 is present by the SSBL method, reception level detection units 24 and 25 that detect the reception levels of ultrasonic waves of the first and second frequencies, respectively, It has a comparison unit 26 that detects the ratio between the received wave levels detected by the level detection units 24 and 25. Further, the underwater distance measuring device 20 calculates the distance to the pinger 10 from the level ratio detected by the comparison part 26, and refers to the direction in which the pinger 10 exists detected by the SSBL processing part 23 to refer to the pinger 10. The CPU 27 has a CPU 27 that determines the position of the position and displays it on the display unit 28.

In the present embodiment, the ratio of the received wave levels of the ultrasonic waves of the first and second frequencies received by the wave receiver 21 remains unchanged in the output of the received wave level detection units 24 and 25. The frequency characteristic and the gain are adjusted so as to maintain the value. Further, the CPU 27 stores the relationship (see FIG. 2) between the ratio between the above-mentioned wave reception levels (difference in logarithmic display) and the distance to the pinger 10 in a memory (not shown). The stored data is discrete, but the value between each data is calculated by the complementary calculation.

In the example of FIG. 2, ultrasonic waves A and B having a first frequency of 30 kHz and a second frequency of 80 kHz are transmitted from the pinger at a level of 140 dB. Since the level difference between the detected ultrasonic waves A and B is 62 dB, it is detected that the distance to the pinger is 3000 m.

In the present embodiment, the first and second ultrasonic waves are transmitted from the same oscillator of the transmitter 11, but even if oscillators are separately provided and transmitted from each oscillator. Good. Further, although the first and second ultrasonic waves are transmitted from the transmitter 11 at the same level, the ultrasonic wave having the larger attenuation amount may be transmitted at a higher level.

[0015]

[Effect of device]

 As described above, according to the present invention, the first and second ultrasonic waves transmitted from the pinger are attenuated faster at higher frequencies, and the first and second ultrasonic waves detected by the level detection unit in the distance calculation unit are detected. The distance to the pinger is calculated from the ratio of the reception level of the second ultrasonic wave, and the position of the pinger is calculated based on the direction in which the pinger is detected by the SSBL processing unit on the display unit and the distance to the pinger calculated by the distance calculation unit. By displaying, there is an effect that the position of the pinger can be accurately determined.

[Brief description of drawings]

FIG. 1 is a block diagram showing an underwater position measuring system of the present invention.

FIG. 2 is a first and a second used in the embodiment of FIG.
It is a characteristic view which shows the relationship between the receiving level of the ultrasonic wave of, and the distance to a pinger.

[Explanation of symbols]

 10 Pinger 11 Transmitter 12, 13 Timer 14 Transmitter 20 Underwater distance measuring device 21 Receiver 22 Receiver 23 SSBL processor 24, 25 Received level detector 26 Comparison unit 27 CPU 28 Display unit

Claims (4)

[Scope of utility model registration request] 1. An underwater position measuring system comprising a pinger and an underwater position measuring device, wherein the pinger transmits a first ultrasonic wave having a first frequency and a second ultrasonic wave having a second frequency from a transmitter. The underwater position measuring device receives the first and second ultrasonic waves from the pinger via a receiver and outputs a first and a second reception output; SSB that adds SSBL processing to the reception output of No. 1 and detects the direction in which the Pinger is present
L processing unit, level detection unit for detecting the reception levels of the first and second ultrasonic waves from the first and second reception outputs, and reception levels of the first and second ultrasonic waves detected by the level detection unit A distance calculation unit that calculates the distance to the Pinger from the difference between
An underwater position measuring system, comprising: a display unit that displays the position of the Pinger detected by the SSBL processing unit and the distance calculated by the distance calculation unit. 2. The underwater position measuring system according to claim 1, wherein the pinger sends the first and second ultrasonic waves at the same level from the wave transmitter. 3. The distance calculation unit stores the level difference between the first and second ultrasonic waves that changes corresponding to the traveling distances of the first and second ultrasonic waves. 3. The underwater position measuring system according to claim 1, wherein the distance to the pinger is calculated from the same level difference between the first and second ultrasonic waves as the difference between the ultrasonic wave reception levels. 4. The distance calculation unit stores the level ratios of the first and second ultrasonic waves that change corresponding to the traveling distances of the first and second ultrasonic waves. 3. The underwater position measuring system according to claim 1, wherein the distance to the pinger is calculated from the same level ratio of the first and second ultrasonic waves as the ratio of the ultrasonic wave reception levels.