JPS5848075B2 - Radio distance measurement method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a radio distance measurement method in which a distance measurement signal consisting of a continuous wave such as a sine wave is sent back and forth between two points on a carrier wave, and distance is measured based on the phase difference of the distance measurement signal. It is related to.

Currently, precision radio distance measuring devices used for hydrographic surveying or port construction work are installed at a main station 1' on board a ship, etc., as shown in Figure 1.
Press , press the slave stations 3/, , 3/2 on the ground, transmit and receive radio waves at Kl as described above for L2, and transmit the radio waves to main station 1' at main station 1'.
′ and the slave station 3'1 and the distance horse between the master station 1' and the slave station 3'2, and the circle with radius R from the slave station 3/1 and the slave station 3'2. The position of the main station 1' is also determined from the intersection with the circle of the radius.

Hey, 4' is the antenna of main station 1', 5' is the measuring instrument body of main station 1', 11', 11'2 are slave stations 3/, , 3/2
The antennas 121 and 124 are the main bodies of the measuring instruments of the slave stations 3'1 and 3.

This radio distance measurement method [,! =- requires three carrier waves (fo, f1, f2) between the master and slave stations as shown in the figure, but currently only 6 sets of radio waves are permitted for this purpose, and they are not used in the same port area, etc. However, there was a drawback that the number of main stations of the radio distance measuring device that could be used simultaneously was limited to six.

For this reason, when carrying out large-scale construction work, etc., there was a drawback that efficiency was extremely low.

In order to improve this drawback, a plurality of master stations that share one set of radio waves and two slave stations that share one set are provided, and each master station and slave stations are sequentially controlled by a synchronization signal to control each master station. Recently, a radio distance measurement method has been proposed in which each distance is measured by a radio wave.

This method has the advantage that the number of main stations can be greatly increased, making it possible to cope with large-scale construction projects and to be able to carry out the construction work efficiently.

However, with this method, the system is synchronized, so if synchronization is disrupted due to radio interference, etc.,
It has the fatal flaw that all main stations become unusable.

? SUMMARY OF THE INVENTION An object of the invention is to provide a radio distance measuring method that can measure distance by sequentially switching a plurality of main stations that share radio waves without synchronizing them.

Another object of the present invention is that the master station and the supervising slave station do not transmit a signal when the time from when the signal is sent to when the signal is returned from the other station exceeds the scheduled time, or after the scheduled distance measurement completion time. To provide a radio wave distance measuring method that allows a supervising slave station to efficiently start communication with the next master station by terminating communication with a partner station.

The radio distance measuring method of the present invention will be explained in detail below with reference to the drawings.

FIG. 2 shows an example of a radio range measuring device that implements the method of the present invention.

This figure shows the configuration of a radio wave distance measuring device that shares one set of radio waves, and the radio wave distance measuring device that shares other sets of radio waves has a similar configuration.

In the figure, 11, 1, ... 1N are the main stations of N stations (N is an integer greater than or equal to 2) that have a distance measurement function, and 2 does not have a distance measurement function; A supervising slave station has a function of supervising the master stations 1N to 1N, and 3 is a normal slave station without a distance measuring function.

Each of the main stations 11 to 1N has an antenna 4 that transmits when a certain condition is met, a main station body 5 that performs a distance measurement operation, and a switch mechanism 6 that controls the antenna 4. and a main station control device 7 that controls the main station main body 5 and the switch mechanism 6.

The supervising slave station 2 includes an antenna 8, a supervising slave station main body 9, and a supervising slave station control device 10 that controls the supervising slave station main body 9 and performs operations such as calling each master station 11 to 1 in sequence. There is.

The normal slave station 3 has an antenna 11 and a normal slave station main body 12.

Each of the main stations 11 to 1 - a ranging signal S consisting of a continuous wave such as a sine wave.

The carrier wave F. The central slave station 2 that received this transmits the distance measurement signal S1 on the carrier wave F1, and the slave station 3 that similarly received this transmits the distance measurement signal S2 on the carrier wave F2.

FIG. 4 specifically shows the internal structure of each main station 1 to 1N, particularly the internal structure of the main station control device 7.

The master station control device 7 includes a call signal decoder 13 that decodes whether or not the call 1 signal from the central slave station 2 is a call signal to its own station, and a confirmation signal decoder 14 that decodes the confirmation signal from the central slave station 2. and a response signal coder 15 that outputs a response signal.
Is the time slightly longer than the time it takes for a confirmation signal to be returned after sending a response signal? A slave station response time timer 16, a distance time timer 17, and a master station control determination circuit 18
It is equipped with.

FIG. 3 specifically shows the internal structure of the supervising slave station 2, particularly the internal structure of the supervising slave station control device 10.

The overall slave station control device 10 has N call signal coders 191 that output different unique call signals for each master station 11 to 1.
, 192...19N, a confirmation signal coder 20 that issues a confirmation signal, and a main station response time timer 21 that is set to a time slightly longer than the time it takes for a response signal to be returned after issuing a calling signal. and a communication failure coder switching time timer 22 which sets the time to switch the coders 191, 19, . . . 19N when a response signal is not returned within the time set in the main station response time timer 21; A distance measurement time timer 22, a distance measurement completion coder switching time timer 23 which is set to a time slightly longer than the time set in the distance measurement time timer 17, and a response signal timer 23 for decoding the response signal. Decoder 24 and overall slave station determination circuit 25
It is equipped with.

Next, an example of the radio wave distance measuring method of the present invention using the above-mentioned device will be explained.

Before entering a series of sequential operations, the device is in the following state.

A) The control circuits 7 and 10 of the master station 2 and the master stations 1, 1, . . . 1N are placed under initial conditions and are in a reset state.

B) The supervising slave station 2 and the normal slave station 3 are always in a transmitting state.

C) Each main station 11-1 is in a receiving state.

The control device 10 of the central slave station 2 is started, its call signal coder 191 is selected, and a unique call signal for calling the main station 11 is formed, and this is transmitted to the antenna 8 using the communication line using the subcarrier. The signal is sent to the main station 11 side, and calls the antenna 4 and main station body 5 of the main station 11.

At this time, the main station response time timer 21 is started.

■ General slave station control device 10 → general slave station body 9 → antenna 8
The calling signal that has passed through the antenna 4 and the main station body 5 is decoded by the calling signal coder 13 of the main station controller 7.

The main station controller 7 simultaneously performs the following operations.

A) Switch mechanism issues a 6K antenna signal command.

B) Ranging signal S.

The carrier wave F. It is then sent via antenna 4 to the controlling slave station 2 and the normal slave station 3.

? ) Activate the response signal coder 15 to generate a response signal, which is sent to the central slave station 2 via the antenna 4 using the telephone line.
Send VC.

D) Start the slave station response time timer 16 and distance measurement time timer 17.

If the paging signal is not decoded, the same state remains as if the paging signal had not been deciphered.

■ The master station body 5 of the master station 11 receives the carrier wave F1 from the central slave station 2.
This main station 1 is determined by the phase difference between the distance measurement signal S1 carried on the carrier wave F2 and the distance measurement signal S2 returned from the slave station 3 on the carrier wave F2.

The operation of measuring the distance between the terminal and the general slave station 2 and the normal slave station 3 is started.

■ Main station controller T → main station body 5 → antenna 4 → antenna 8
→The response signal that has passed through the main station main body 9 is decoded by the response signal decoder 24, but the following conditions are satisfied: A) it must be decoded correctly, B) it must be within the operating time of the master station response time timer 21. Proceed to the garden only when you are ready.

(5) If the condition 7) is not satisfied, the communication failure timer 22 is started, and at the same time as the timer 22 finishes counting, it is switched to the next call signal coater 192,
Similarly, the next main station 12 is called using IlcL.

■ When the response signal is decoded, a confirmation signal is output from the confirmation signal coder 20, and this signal is sent to the antenna 8 using the speech line.
It is sent to the main station 1 via VC.

At this time, the Gouda switching time timer 23 is started upon completion of the ranging signal.

Leap The confirmation signal enters the confirmation signal decoder 14 and is decoded, but if the following two conditions are satisfied: A) it must be read correctly, and B) the slave station response time timer 16 must be operating. Proceed to figure.

- If the young LIMI conditions are not satisfied, all timers in the main station controller I are reset and transmission is immediately stopped.

■ Radio wave F that has already been emitted.

(So) is continuously emitted from the main station 1, and based on this, the controlling slave station 2 returns a ranging signal S1 with a carrier wave F1K, and! The normal slave station 3 returns a distance measurement signal S2 with a carrier wave F2K, and the phase difference between these distance measurement signals S1 and S2 causes the main station 11, the general slave station 2, and the normal slave station? Measure each distance to.

Radio wave F. (So) is stopped when the ranging time timer 17, which was started in step (3), completes its operation.

At this time, all timers in the main station controller 7 are reset.

When the distance measurement completion coder switching time timer 23 completes its operation, the coder 19 is switched to the next calling signal coder 19, and the next main station 12 is called.

■ Main station 1 in the same way below.

operates, followed by main stations 13, . . . 1N, 11, and so on.

Although the case where the distance is measured by sharing one set of radio waves has been described above, the distance can be measured in the same manner at the same time on the side sharing the other sets of radio waves.

According to experiments, it was possible to share the main station with at least four stations using one set of radio waves.

Therefore, for 6 sets of radio waves, the main station is at least 6X4=24
Can be used in stations.

According to the present invention, the following excellent effects can be achieved.

(4) In the present invention, each main station that has a distance measurement function does not have a calling function, and a third-party supervising slave station that does not have a distance measurement function calls each main station in turn. Since only the main station that receives the call measures the distance within the given time, each main station has a calling function and calls the slave stations at its own will to measure the distance. This allows multiple master stations to measure distances in an orderly and efficient manner, avoiding the situation where multiple master stations simultaneously make repeated calls to slave stations in the same building using the same radio wave, making it impossible to measure distances. .

(B) Since one set of radio waves can be shared and distance measurement work can be carried out by multiple main stations in an orderly manner, it is now possible to carry out distance measurement work in an orderly manner by a large number of main stations using a limited number of sets of radio waves. Therefore, even large-scale construction work can be adequately handled and the construction work can be carried out efficiently.

(0) Since a so-called call answer method is used without using a synchronization signal, it is possible to avoid a situation in which all main stations become unusable.

0 When a response signal is not returned from the master station that should respond to a call to the controlling slave station within a predetermined time, the controlling slave station terminates communication with that main station and calls the next master station, so the previous master station is called. You can save time by not having to keep calling the station.

[F] Various situations in which communication becomes impossible, such as when another work vessel exists between a certain master station and a supervising subordinate station, or when a certain master station enters behind an island etc. from the perspective of a supervising subordinate station. It is possible to efficiently communicate with each of the remaining main stations and perform distance measurement work without disturbing the remaining main stations.

(8) The master station that has received the paging signal receives a confirmation signal from the controlling slave station within a predetermined time after sending the response signal, so the master station can confirm that a communication link with the controlling slave station has been established. You can check this and perform distance measurement work.

(G) After the scheduled distance measurement completion time, the controlling slave station terminates communication with the master station in progress and calls the next master station, and the master station also cuts off communication with the controlling slave station. It is possible to prevent long-term communication between only the main stations, and each main station can perform distance measurement work fairly and in an orderly manner.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a conventional radio distance measuring device, Fig. 2 is a block diagram of a radio distance measuring device implementing the method of the present invention, and Figs. 3 and 4 are buttons for the device shown in Fig. 2. This is a block diagram showing the specific configuration of a supervising slave station and a master station. 1~1N...Main station, 2...Supervising slave station, 3...Normal slave station, 16...Slave station response time timer, 17...Distance measurement time timer, 21...Main station response time timer , 22...
- Coder switching time timer when communication is not possible, 23... Coder switching time timer when distance measurement is completed.

Claims (1)

[Claims] 1 A distance measurement signal consisting of a continuous wave is sent back and forth on a carrier wave between a master station with a distance measurement function and a slave station without a distance measurement function, and the position of the reciprocated distance measurement signal is calculated. The radio wave distance measurement method in which the distance is measured by the main station based on the phase difference has become popular, and a set of N stations (N is an integer greater than or equal to 2) that share a set of radio waves, and one station that controls these main stations. and a supervising slave station, the supervising slave station sequentially sends a unique paging signal to each of the master stations at regular intervals, and then a response signal is not returned from the master station within a predetermined period of time. In some cases, communication with the main station is terminated and the next main station is called, and the main station that has responded to the designated calling signal L2 transmits the ranging signal onto the carrier wave within a predetermined time after sending the response signal. It starts measuring the distance by making a round trip to and from the supervising slave station, and if a confirmation signal is not returned after sending the response signal, it terminates communication with the supervising slave station, and when the confirmation signal is returned within a predetermined time. When the master station arrives, the master station continues to communicate with the master station and measures the distance, and after the scheduled measurement completion time, the master station terminates communication with the master station and calls the next master station. K The main station is also the same? A radio distance measurement method characterized by terminating communication with slave stations.