JPS6350894B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] The present invention relates to a system for transmitting data signals using a wireless communication system. In particular, the present invention relates to a method for measuring the amount of delay phase between base stations in a system that operates by adjusting the amount of data signal delay phase between base stations to a constant value.

[Prior art]

With mobile radios such as automobile radios, the same data signal is sent from a master station to multiple slave stations via wired lines.
There is a method in which this signal is further transmitted from each slave station to the mobile station using the same radio frequency. At this time, the data signals sent from each slave station must be aligned in the same phase. As a method for confirming that the data signals are in the same phase, a method as shown in FIG. 1 is conventionally known.

FIG. 1 is a block diagram of the main parts of a conventional system. The signal generator 2 of the master station 1 has a wired line 3 ₁ ~
3 _o to each slave station 5 ₁ to 5 _o 's wireless signal transmitter 6 ₁ via
~6 _o is connected. Further, a phase measuring device 7 is connected to the signal generator 2 .

Now, to explain the case of calculating the amount of delay phase at the first slave station 5 ₁ and the second slave station 5 ₂ in the conventional method, first, the radio signal transmitter 6 ₂ of the second slave station 5 ₂ is Then, only the radio signal transmitter ₆₁ of the first slave station ₅₁ is operated. This radio wave is received by the phase measuring device 7 of the master station 1, and the phase amount with respect to the data signal directly input from the signal generator 2 is measured. Next, the wireless signal transmitter 6 ₁ of the first slave station 5 ₁ is stopped, and the wireless signal transmitter 6 ₂ of the second slave station 5 ₂ is activated. This second slave station 5 ₂
The phase measuring device 7 of the master station 1 receives the radio waves transmitted from the base station 1, and measures the amount of phase with respect to the data signal directly input from the signal generator 2. By determining the difference in phase amounts, the actual delay phase amount between the first slave station 5 ₁ and the second slave station 5 ₂ is measured.

However, such a conventional method has the disadvantage that communication must be temporarily interrupted in order to cut off the transmission from the slave station, and moreover, each measurement operation requires two steps.

[Purpose of the invention]

The present invention improves this point, and aims to provide a phase difference measurement method that does not require interruption of communication and can easily perform phase difference measurement.

[Summary of the invention]

The present invention comprises a master station and a plurality of slave stations connected to the master station via a wired communication line and equipped with wireless signal transmitters, and a signal emitted from the master station is transmitted to each slave station via the wired line. A wireless communication method in which the signals are sent from the radio signal transmitter of each slave station at the same frequency and the phase of the signal is the same, and the phase of the signal transmitted by each slave station is the same. In this method, the master station is equipped with means for generating a specific signal and transmitting this specific signal to the wired line, and each slave station is equipped with a wireless communication transmitter with a different transmission frequency. The station is equipped with a means for inputting the specific signals sent through the wire into the wireless communication transmitter, and is a phase difference measuring device having a plurality of receivers that simultaneously receive radio waves transmitted from the wireless communication transmitter. It is characterized in that it is configured to measure.

[Explanation based on examples]

An embodiment of the present invention will be described based on the drawings.
FIG. 2 is a block diagram of essential parts of an embodiment of the present invention. In comparison with _the conventional _{example shown in FIG .} It is characterized by the provision of a phase measuring device 10 that receives two transmitted signals.

That is, each slave station ₅₁ to _5o is provided with wireless communication transmitters ₉₁ to _9o having different transmission frequencies, switches ₁₁₁ to _11o , and a wired line _31.
~ _3o is connected to the signal generator 2 in the master station 1. A controller 12 in the master station 1 is connected to the wireless communication transmitters 9 ₁ to 9 _o via control lines 13 ₁ to 13 _o .

Further, the phase measuring device 10 is mounted on a car or the like,
During phase difference measurement, the phase difference is moved between slave stations where the phase difference is measured. This phase measuring device 10 has a built-in receiver and is configured to receive a transmission signal from a slave station related to phase difference measurement.

Other points are similar to the conventional example shown in FIG. 1, and the same reference numerals indicate the same parts.

A case will be described in which the amount of delay phase difference between slave stations 5 ₁ and 5 ₂ is measured with such a configuration. Other slave stations 5 ₃ ~
The phase difference measurement at 5 _° is also performed in a similar manner. That is, a specific signal is constantly sent out from the signal generator 2 in the master station 1, and this specific signal is transmitted to the wired lines ₃₁ to _3o.
Through the wireless signal transmitter 6 ₁ ~ 6 _o of the slave station 5 ₁ ~ 5 _o
are transmitted on the same frequency. Now slave station 5 ₁
In order to measure the phase difference between the signals transmitted by the radio signal transmitters 6 ₁ and 6 ₂ of the base station ₁ , the controller 12 in the master station 1 passes the control lines 13 ₁ and 13 ₂ to the 7
Turn on the switches 11 ₁ and 11 ₂ of the wireless communication transmitters _{9 1} and 9 ₂ of the slave station 5 1 and the second slave station 5 ₂ , respectively.
command to do so. This wireless communication transmitter 9 ₁ , 9 ₂
transmit radio waves of different frequencies. In this state, the specific signal sent from the signal generator 2 of the master station 1 passes through the wired lines 3 ₁ and 3 ₂ and is sent from the wireless signal transmitters 6 ₁ and 6 ₂ as well as the wireless call transmitter 9 ₁ , 9 ₂ is also sent. Therefore, the call will not be interrupted. On the other hand, the phase measuring device 10 receives transmitted radio waves of different frequencies from the wireless communication transmitters 9 ₁ and 9 ₂ using a built-in receiver, and determines the phase difference between the demodulated specific signals from the slave stations 5 ₁ and 5 ₂ . Measure the delay phase difference.

Although the above embodiment shows an example of measuring the phase difference between two slave stations, it is also possible to measure the phase difference for two or more slave stations at the same time as long as the phase measuring device can receive it. Good too. In this case, a corresponding number of receivers in the phase measuring device is required.

[Explanation of effects]

As explained above, according to the present invention, specific signals from the master station that are input to the wireless signal transmitters of the slave stations are input to wireless call transmitters having different transmission frequencies, and are transmitted as transmission signals of different frequencies. send,
This was received and demodulated by the receiver of the phase measuring device to measure the delay phase difference of the slave station.

Therefore, there is no need to interrupt communication during phase difference measurement, and service can be improved.Moreover, since the measurement operation is simple, measurement efficiency can be improved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the main parts of a conventional example. FIG. 2 is a block diagram of essential parts of an embodiment of the present invention. 1... Master station, 2... Signal generator, 3 ₁ ~ 3 _o ...
Wired line, 5 ₁ ~ 5 _o ... Slave station, 6 ₁ ~ 6 _o ... Wireless signal transmitter, 7, 10 ... Phase measuring device, 9 ₁ ~ 9 _o
...Radio communication transmitter, 11 ₁ - 11 _o ... Switch, 12 ... Controller, 13 ₁ - 13 _o ... Control line.

Claims (1)

[Scope of Claims] 1. A master station and a plurality of slave stations each having a wireless signal transmitter connected to the master station via a wired communication line are arranged, and a signal emitted from the master station is transmitted through the wired communication line. A wireless communication method in which the signals are sent to each slave station via the radio signal transmitter of each slave station at the same frequency and in the same phase,
In the method of measuring whether the phases of the signals transmitted by each of the slave stations are the same, each slave station is equipped with a wireless communication transmitter with a different transmission frequency in addition to the wireless signal transmitter, and The station generates a specific signal and sends this specific signal to the wired line, and each slave station inputs the specific signal sent via the wired communication line to the wireless call transmitter, and the wireless call transmitter A phase difference measurement method characterized in that measurement is performed using a phase difference measurement device having a plurality of receivers that simultaneously receive radio waves transmitted by a phase difference measurement system.