JP2001083247A - Collecting apparatus for sounding data - Google Patents

Abstract

PROBLEM TO BE SOLVED: To store sounding data to a small-capacity storage medium by a method wherein, when the sounding data is collected, the data to be recorded is limited and reduced to data only near a measuring point. SOLUTION: When a measuring ship reaches a measuring point, a GPS receiver 2 sends a measuring-point signal to a write control circuit 3. The write control circuit 3 stops the write operation of received data which corresponds to a latter transmitting operation to an auxiliary memory 5. On the other hand, received data which corresponds to a transmitting operation in the predetermined number of times is stored in a portable storage medium 4. Then, out of the received data which is stored in the auxiliary memory 5, received data which corresponds to a transmitting operation in the predetermined number of times in the past is read out from a transmitting operation immediately before the arrival of the measuring-point signal, and it is stored in a continued place as data in the past, to the received data stored in advance in the portable storage medium 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention belongs to the field of sound sounding data recording technology.

[0002]

2. Description of the Related Art Conventionally, when it is intended to measure the water depth of a certain water area, a grid having lines at a predetermined interval (for example, 10 m) perpendicular to the water area is assumed, and the intersection (namely, the eye) is taken.
Using as a measurement point, write the water depth at that point in the water area map. Specifically, a recording paper type (pen recorder type) acoustic sounding device is mounted on the measuring ship, and the measuring ship is driven along the line assumed in the measuring water area while the sounding device is operated continuously. Read the water depth on the recording paper at the point and fill in the corresponding measurement point on the water area map.

[0003] In this case, the position of the measuring vessel is grasped by geometric surveying (for example, triangulation using a transit) from a fixed point in land or water, and a signal is sent to the measuring vessel when it comes to the measuring point. By sending it, the measuring vessel knows that it has come to the measuring point, reads the water depth on the recording paper at that time, and fills in the corresponding measuring point on the water area map. Naturally, the narrower the distance between the eyes, the more accurate the water depth map.

[0004]

However, the recording device for recording on the recording paper of the acoustic sounding device in the above-mentioned prior art has a mechanically movable part for running a pen and for winding the recording paper, and requires maintenance. In addition to the above-mentioned problems, when the space occupied by the onboard equipment is limited as in the case of a measurement ship, the result is relatively large, and the obtained data is also on the recording paper. However, there is a problem that it is not suitable for data processing. Therefore, in order to solve the above problem, it is conceivable to record the received data from the sounding sounder on a data-reproducible electronic recording medium such as a magnetic disk, a magnetic tape, or a magneto-optical disk. As a result, the mechanically movable parts become small, the apparatus scale becomes compact, and computer processing of data becomes possible.

However, this raises the following problem regarding the storage capacity of the recording medium. In a conventional sounding sounder, received wave data is subdivided into 6000 in the depth direction, sampled and recorded. For example, if the maximum measured depth is 3
If it is 0 m, data of points at intervals of 0.5 cm is recorded in the depth direction. In the case of 60 m, it means data at intervals of 1 cm. Then, the intensity level of the data of one sample is eight levels, that is, 3-bit data. Such data recording is performed for each transmission. The number of transmissions is, for example, 375 at the maximum measured water depth of 120 m.
Times / minute, 750 times / minute at 60m, 1500 times / 30m
Minutes.

[0006] Therefore, as in the case of recording on a conventional recording paper, when the measuring vessel attempts to store data during the traveling along the assumed measurement line in the storage means, the data is not stored. The amount becomes huge, and the storage capacity of the memory must be huge.

However, the conventional water depth measurement is not intended for continuous water depth measurement, but for measuring the water depth at a measurement point corresponding to a grid. Therefore, continuous data between one measurement point and the next measurement point is largely unnecessary.
However, it is difficult to measure only the depth of a certain point called the measuring point, so the purpose can be achieved by extracting the data of the measuring point from the data within a certain width before and after including the measuring point. Become. Therefore, it is not necessary to store all the water depth data obtained during the traveling of the measuring ship in the storage means.

SUMMARY OF THE INVENTION In view of the above-mentioned problems of the prior art, it is an object of the present invention to set a predetermined transmission before and after a measurement ship arrives at a measurement point and receives an information signal indicating that the measurement point is now. It is an object of the present invention to provide an acoustic sounding data recording device that stores only received data for the number of times in a storage means.

[0009]

In order to achieve the above object, an acoustic sounding data recording apparatus according to the present invention is characterized by comprising the following components. (B) A position signal generator that generates a position signal indicating that a ship equipped with an acoustic sounder passes the measuring point when the ship passes the measuring point. (B) It is determined at predetermined intervals in the water depth measurement target water area. A portable storage medium for recording a plurality of measurement points and water depth data in the vicinity thereof. (C) The portable storage medium has a capacity capable of storing the received data of the sound sounding device for a predetermined number of transmissions, and only for the number of transmissions. After storing, the received data for the next transmission is stored sequentially by discarding the stored received data for the oldest transmission. (D) When a position signal arrives from the position signal generator Then, while receiving the received data from the sounding sounder corresponding to a predetermined plurality of subsequent transmissions in the portable storage medium, the reception of the position signal from the auxiliary memory is repeated. The received data corresponding to a plurality of predetermined transmissions is read out retroactively, and the received data stored in the portable storage medium is stored in a time-sequential manner in the received data, and a code at which a measurement point can be identified is stored. Write control circuit to control to attach

[0010] A configuration is also conceivable in which the position signal generator is a GPS receiver for a positioning system using satellites.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An acoustic sounding data recording apparatus according to the present invention is mounted on a water depth measuring ship together with an acoustic sounding machine. Its configuration, as described in the section on problem solving means,
It comprises a position signal generator, a portable storage medium, an auxiliary memory, and a write control circuit. The position signal generator is a means for emitting a signal indicating the fact that the measuring vessel travels along the line assumed in the measuring water area and just arrives at the measuring point. Therefore, as before, it has the position of its own ship measured by a geometric survey from a fixed point in land or water, and when it reaches the measurement point, it receives a signal and presses a switch to emit an electric signal. May be something,
It may receive a radio wave emitted from a fixed facility, measure the position of the ship, and output a signal indicating the arrival at the measurement point, or a GPS, which is a positioning system that has been recently performed. May be used to output a signal when a measurement point is reached using the above receiver. In the case of using such a means capable of automatically measuring the position of the own ship, recording of sounding data can be automatically performed.

The portable storage medium is a storage medium that can be removed and transported after the measurement of the target water area is completed and the data is taken out of the recording device and processed by a computer for data processing. When a position signal indicating a measurement point arrives, received data corresponding to a predetermined number of subsequent transmissions is stored in the storage medium. The auxiliary memory is a small-capacity memory provided for collecting reception data corresponding to a predetermined number of transmissions before the time when the position signal indicating the measurement point arrives. After storing the received data corresponding to the capacity, when receiving the received data corresponding to the next transmission, the received data corresponding to the oldest transmission is discarded. Therefore, the receiving data corresponding to several times of the past transmission from the present time is always updated to be stored.

The write control circuit controls storage in the portable storage medium and writing and reading to and from the auxiliary memory. When the data is stored in the portable storage medium, the received data of which measurement point is stored so that it can be identified at the time of reading.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an acoustic sounding data recording apparatus according to the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the embodiment. The sounding device 1 is composed of a transceiver 6 and a transducer 7 and is conventional. Here, it is assumed that the received data output from the transceiver 6 has been converted into a digital signal. The GPS receiver 2 is used as a position signal generator, and when a measuring vessel comes to a measuring point, a measuring point signal is sent to the writing control circuit 3. Upon receiving the measurement point signal, the write control circuit 3 starts storing received wave data corresponding to the subsequent transmission in the portable storage medium 4, and the auxiliary memory 5 based on the received data.
Stop updating data to. When the receiving data corresponding to the transmission of a predetermined number of times (for example, 10 times) has been stored in the portable storage medium 4, the storage is temporarily stopped, and the storage is temporarily stored in the auxiliary memory 5. Among the received data, the received data corresponding to the predetermined number of times, for example, ten times of transmission, is read back from the transmission immediately before the arrival of the measurement point signal to the past, and is sequentially read out from the portable storage medium 4. The previously stored data is stored in a location connected as past received data.

In this way, received data corresponding to a total of 20 transmissions, for example, 10 times before and after the point of arrival of the measurement point signal is stored. At this time, the data is stored so that the correspondence between the measurement points and the received data is not lost. When the storage of the reception data as described above for one measurement point is completed, the storage in the portable storage medium 4 is stopped, and the writing / updating to the auxiliary memory 5 is restarted. Then, when the measurement vessel travels along the assumed line and reaches the next measurement point, the above operation is repeated again.

As described above, by storing only the reception data in a certain range before and after the measurement point,
The data amount can be greatly reduced as compared with the case where all are stored, and a portable storage medium having a smaller capacity is sufficient.

Now, as an example, if the distance between the measurement points is 1
0m, traveling speed of the measuring vessel is 3 knots, transmission frequency is 1 per minute
Considering the case of 500 times (when the maximum measured water depth is 30 m), the number of transmissions from the measurement point to the next measurement point is 161 times. Of these, if only the received data of a total of 20 times are stored, each 10 times before and after the measurement point, as described above, the data amount becomes 1/8, which can be greatly reduced.

[0018]

As described above, the sounding sounding data recording apparatus of the present invention can use the auxiliary memory to limit the received wave data to be stored only to the data before and after the measuring point. The received data to be stored can be greatly reduced, and the capacity of the storage medium can be small, so that the restriction problem when a large-capacity data is required can be avoided, and the GPS can be used as a position signal generator.
Adopting an automatic positioning system such as a receiver has the advantage that the measuring vessel automatically measures the depth of the measuring point and stores the data simply by traveling on the specified line, Since the data is stored in the portable storage medium, there is an advantage that after the measurement on the measuring vessel is completed, the data is carried to a place where a computer is provided, and the data can be processed by a computer.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of an acoustic sounding data recording apparatus according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Acoustic sounder 2 GPS receiver 3 Writing control circuit 4 Portable storage medium 5 Auxiliary memory 6 Transceiver 7 Transceiver

Claims (2)

[Claims] 1. An acoustic sounding data recording apparatus having the following components. (B) A position signal generator that generates a position signal indicating that a ship equipped with an acoustic sounder passes the measuring point when the ship passes the measuring point. (B) It is determined at predetermined intervals in the water depth measurement target water area. A portable storage medium for recording a plurality of measurement points and water depth data in the vicinity thereof. (C) The portable storage medium has a capacity capable of storing the received data of the sound sounding device for a predetermined number of transmissions, and only for the number of transmissions. After storing, the received data for the next transmission is stored sequentially by discarding the stored received data for the oldest transmission. (D) When a position signal arrives from the position signal generator Then, while receiving the received data from the sounding sounder corresponding to a predetermined plurality of subsequent transmissions in the portable storage medium, the reception of the position signal from the auxiliary memory is repeated. The received data corresponding to a plurality of predetermined transmissions is read out retroactively, and the received data stored in the portable storage medium is stored in a time-sequential manner in the received data, and a code at which a measurement point can be identified is stored. Write control circuit to control to attach 2. The sound sounding data recording device according to claim 1, wherein the position signal generator is a GPS receiver.