JPH0728230B2 - Phase adjustment method - Google Patents

Description

The present invention relates to a multi-station transmission system in which one signal is sent from a central station via a transmitting section from a plurality of transmitting stations at the same radio frequency. The present invention relates to a phase adjustment method for simultaneously transmitting.

[Conventional technology]

FIG. 4 is a block diagram showing a conventional phase adjustment method.
In the figure, 1 is a control unit of the central office, 2 is a signal sending unit of the central office, 3 is a central transmitting station, 4 and 5 are normal transmitting stations, and 6a.
6c are variable delay circuits of the central transmitting station 3 and the normal transmitting stations 4 and 5, 7a to 7c are transmitters of the central transmitting station 3 and the normal transmitting stations 4 and 5, 8a to 8c are central transmitting station 3 and the normal transmitting stations. 4,5 transmitting antennas, 9a and 9b are receiving antennas of the ordinary transmitting stations 4 and 5, 10a and 10b are phase adjusting receivers of the ordinary transmitting stations 4 and 5, 11a and 11b are phases of the ordinary transmitting stations 4 and 5. It is a measuring instrument.

Next, the operation of the phase adjustment method having the above configuration will be described. First, when performing the phase adjustment, the transmitter 7a of the central transmitting station 3 is turned on, and the transmitters 7b and 7c of the normal transmitting stations 4 and 5 are turned off. Then, by controlling the control unit 1, the signal sent from the signal sending unit 2 is input to the transmitter 7a via the variable delay circuit 6a. Therefore, the transmitter
The signal transmitted from the transmitting antenna 8a by the transmitting operation of 7a is normally received by the receiving antennas 9a and 9b of the transmitting stations 4 and 5. The received signals received by the receiving antenna 9a of the normal transmitting station 4 and the receiving antenna 9b of the normal transmitting station 5 are received by the phase adjusting receivers 10a and 10b and then input to the phase measuring devices 11a and 11b. Therefore, the phase measuring devices 11a and 11b measure the phase difference between the signal transmitted from the signal transmitting unit 2 by wire and the signal output from the phase adjusting receivers 10a and 10b, and the phase difference is measured. Output a signal. Therefore, the variable delay circuit 6b of the normal transmission station 4 and the variable delay circuit 6c of the normal transmission station 5 receive this phase difference signal and set the delay amount so that the phase difference becomes zero.
As a result, the transmitting antenna 8a of the central transmitting station 3, the transmitting antenna 8b of the normal transmitting station 4, and the transmitting antenna of the normal transmitting station 5
The transmission signal from 8c can be transmitted at the same time.

FIG. 5 is a block diagram showing another conventional phase adjustment method. In the figure, 12 is a receiving antenna for phase adjustment of the central transmitting station, 13 is a phase adjusting receiver of the central transmitting station, and 14, 15
And 16 are normal transmitting stations, 17a to 17c are normal transmitting stations 14, 15 and 16 transmitters respectively, 18a to 18c are normal transmitting stations 14, 15 and 16 transmitting antennas respectively, and 19a to 19c are normal transmitting stations respectively. 14, 15 and 16 phase adjusting transmitters, 20a to 20c are normal transmitting stations 14, 15 and 16 phase adjusting transmitting antennas, 21a to 21c are variable delays provided for normal transmitting stations 14 to 16 The circuit, 22 is a phase measuring device.

Next, the operation of the phase adjustment method with the above configuration will be described. First, when performing the phase adjustment, the transmitters 17a to 17c of the normal transmission stations 14, 15 and 16 are turned off, the phase adjustment transmitter 19a is turned on, and the phase adjustment transmitters 19b and 19 are turned on.
Turn off c. Then, the signal transmitted from the signal transmission unit 2 under the control of the control unit 1 is input to the phase adjustment transmitter 19a of the normal transmission station 14 via the variable delay circuit 21a and also to the phase measuring device 22. Therefore, the phase adjusting transmitter 19a transmits a signal from the phase adjusting transmitting antenna 20a at a frequency different from the normal frequency. And
The transmitted signal is received by the phase adjusting receiving antenna 12 of the central transmitting station, and then input to the phase measuring device 22 via the phase adjusting receiver 13. Therefore, this phase measuring instrument
Reference numeral 22 measures the phase difference between the signal transmitted by wire from the signal transmission unit 2 and the signal output from the phase adjustment receiver 13, and outputs the phase difference signal to the control unit 1. Therefore, the control unit 1 controls the variable delay circuit 21a and sets the delay amount so that the phase difference becomes zero. Next, transmitter 19 for phase adjustment
By turning on b and turning off the phase adjustment transmitters 19a and 19c, the delay amount of the variable delay circuit 21b is set in the same manner as above. Similarly, the delay amount of the variable delay circuit 21c is set. As a result, the normal transmitting station 1
By driving the transmitters 17a to 17c of 4 to 16, transmission signals can be simultaneously transmitted from the transmission antennas 18a to 18c.

[Problems to be solved by the invention]

The conventional phase adjustment method described above, in particular, requires a phase adjustment receiver and a phase measuring device for each normal transmitting station in the phase adjustment method shown in FIG. The error is not calibrated, and the phase setting accuracy deteriorates due to the error of the phase adjustment receiver. Further, the phase adjustment method shown in FIG. 5 requires a frequency different from the normally used frequency, and the error of the transmitter is not calibrated, and the phase setting accuracy is poor due to the error of the transmitter for phase adjustment. There was a problem.

Further, in the phase adjustment method shown in FIGS. 4 and 5, when there is a normal transmitting station that is far from the central station and cannot perform wireless transmission / reception with the central station, the normal transmitting station There was a problem that the phase of could not be adjusted.

[Means for solving problems]

The phase adjustment method according to the present invention is configured so that only one transmission station among the first to Nth transmission stations is turned on, and the reception signal received by the phase adjustment receiver of the central station and the transmission signal at the central station are transmitted. The phase difference of the variable delay circuit is set so that the obtained phase difference becomes a specified value.On the other hand, a sub central station is provided as one of the transmitting stations to activate the switching means. Then, the signal received by the phase adjustment receiver of the central station is switched to a signal that is received by the receiver of the sub central station and transmitted to the central station by wire, and is different from the first to Nth transmitting stations. Turn on only the M-th transmitting station far from the central station, and transmit the transmission signal from the central station from the M-th transmitting station through the variable delay circuit provided for the M-th transmitting station. Transmit and transmit the transmission signal from this transmitter to the receiver at the sub-central office. Received and transmitted by wire to the central station,
The phase difference between this transmitted signal and the transmission signal at the central office is measured as the first phase difference, and only the transmitter of the sub central office is turned on, and the variable delay provided for the sub central office is set. Through the circuit, the transmission signal from the central office is transmitted from the transmitter of the sub-central office, the transmission signal from this transmitter is received by the receiver of the sub-central office, and is transmitted to the central office by wire. The phase difference between the incoming signal and the transmission signal at the central station is measured as the second phase difference, and based on the measured difference between the first phase difference and the second phase difference, The delay amount to be set in the variable delay circuit provided in the above is determined.

[Action]

The present invention can simplify the configuration and improve the phase setting accuracy. Further, the phase of a transmitting station located far away from the central station can be adjusted.

〔Example〕

FIG. 1 is a block diagram showing a basic example of the phase adjusting method according to the present invention. In the figure, 23a to 23c are normal transmitting stations equipped with transmitters 24a to 24c and transmitting antennas 25a to 25c, and 26 is a pager capable of simultaneously receiving radio waves from the transmitters 24a to 24c depending on the location. , And 27 is the receiving antenna of this receiver 26.

Next, regarding the operation of the phase adjustment method with the above-mentioned configuration,
A description will be given with reference to FIGS. First, when performing the phase adjustment, the transmitters 24a and 24b are turned on and the transmitter 24c is turned off. When the control section 1 is controlled to send a signal from the signal sending section 2, the signal is sent to the transmitting station 24a of the normal transmitting station 23a and the transmitter 24b of the normal transmitting station 23b via the variable delay circuits 21a and 21b, respectively. input. Therefore, the transmitters 24a and 24b each perform a transmission operation and output a transmission signal on the same carrier, but if there is a delay error in the transmitters 24a and 24b at this time, the transmitter antenna 25a causes the transmission antenna 25a to transmit a signal as shown in FIG. The transmission signal shown in FIG. 2B is transmitted, and the transmission signal shown in FIG. 2B is transmitted from the transmission antenna 25b. Then, the receiving antenna 12 for phase adjustment receives the radio waves emitted from the transmitting antennas 25a and 25b, so that the signal shown in FIG. Output. Therefore, in the phase measuring device 22, since the signal transmitted by wire from the signal transmitting unit 2 and the signal received by the phase adjusting receiver 13 do not match, the normal transmitting stations 23a to 23c are set to The phase adjustment operation starts as the Nth transmitting station. Therefore, the transmitter 24a is turned on,
The transmitters 24b and 24c are turned off, and the delay amount of the variable delay circuit 21a is set to zero. The signal sent from the signal sending unit 2 under the control of the control unit 1 is a variable delay circuit.
Input to transmitter 24a via 21a. Therefore, the transmitter
24a performs a transmission operation and outputs a transmission signal from the transmission antenna 25a. Therefore, the phase adjustment receiving antenna 12 receives this transmission signal and outputs it to the phase adjustment receiver 13. Therefore, the phase measuring device 22 measures the phase difference between the signal transmitted by wire from the signal transmitting unit 2 and the signal received by the phase adjusting receiver 13, and when the phase difference is 2 ms, for example. The phase difference signal of 2 ms is output to the control unit 1. Next, after turning on the transmitter 24b and turning off the transmitters 24a and 24c, in the same manner as the above operation, the phase difference is measured.For example, when the phase difference is 4.6 ms, 4.6 ms is set. The phase difference signal of 1 is output to the control unit 1. Next, after turning on the transmitter 24c and turning off the transmitters 24a and 24b, in the same manner as the above operation, the phase difference is measured.For example, when the phase difference is 6 ms, the phase difference of 6 ms is detected. The signal is output to the control unit 1. Therefore, the control unit 1 is 2ms, 4.6ms, 6m
By inputting the phase difference signal of s, if the specified value is made larger than 6 ms, for example, 10 ms, the transmission delay amount of the variable delay circuit 21a is set to 10 ms−2 ms = 8 ms, and the transmission delay amount of the variable delay circuit 21b is set. Adjustable delay circuit 21 by setting 10ms-4.6ms = 5.4ms.
Set the transmission delay amount of c to 10ms-6ms = 4ms. In this way, by adjusting the transmission delay amount of all the variable delay circuits 21a to 21c, each transmitter 24a to 24c can send the same signal at the same time. Therefore, the receiver 26 can receive a correct waveform.

FIG. 3 is a block diagram showing an embodiment of the phase adjusting system according to the present invention. For example, when the normal transmitting station 23c as the Mth transmitting station is located far from the central station, the normal transmitting station 23c Receiver for phase adjustment of the central office's transmission signal from 1
This is the case when it cannot be received at 3. In the figure, 28 is a switch equipped with a movable contact 28a, fixed contacts 28b and 28c, and a switching drive unit 28d, and 29 is a transmitter 30a, a transmission antenna 30b, and a receiver.
A sub central station including 31a and a receiving antenna 31b, 32 is a variable delay circuit for adjusting the delay of the transmitter 30a, and 33 is a memory.

Next, the operation of the phase adjustment method having the above configuration will be described. First, the normal transmitting stations 23a and 23b and the sub central station 29 are used as the first to Nth transmitting stations, and their respective transmitters 24a, 24b and 30a.
Phase adjustment is performed by the operation described with reference to FIGS. As a result, for example, the phase difference between the normal transmission stations 23a, 23b and the sub central station 29 is 2ms, 4.6ms and 6ms, the specified value is 10ms, the transmission delay amount of the variable delay circuit 21a, 21b and 32 is 8ms. , 5.4ms and 4ms.

Next, since the normal transmission station 23c is far away from the central station, the switching drive unit 28d of the switching device 28 is energized to switch and connect the movable contact 28a to the fixed contact 28c. And the normal transmitting station 23c
Only the transmitter 24c is turned on, and the delay amount of the variable delay circuit 21c is set to zero. Then, the signal transmitted from the signal transmission unit 2 by controlling the control unit 1 is input to the transmitter 24c of the normal transmission station 23c via the variable delay circuit 21c. Therefore, the transmitter 24c operates for transmission and transmits a transmission signal from the transmission antenna 25c. Then, the transmitted radio wave is received by the receiving antenna 31b of the sub central office 29 and then sent to the receiver 31a. The signal output from the receiver 31a is supplied to the phase measuring device 22 via the fixed contact 28c and the movable contact 28a of the switching device 28.
To enter. Therefore, the phase measuring device 22 measures the phase difference between the signal transmitted by wire from the signal transmitting unit 2 and the signal input via the switch 28 as the first phase difference, and for example, this position difference is measured. When the phase difference is 13 ms, the phase difference signal of 13 ms is output to the control unit 1. The controller 1 stores this 13ms in the memory 33.
The phase difference signal of is stored.

Next, only the transmitter 30a of the sub central office 29 is turned on. In this case, the delay amount of the variable delay circuit 32 is set to 4 ms.

The signal output from the signal transmission unit 2 by controlling the control unit 1 is transmitted via the variable delay circuit 32 to the transmitter 30 of the sub central office 29.
Enter in a. Therefore, the transmitter 30a operates for transmission and transmits a transmission signal from the transmission antenna 30b. Then, the transmitted radio wave is received by the receiving antenna 31b of the sub central office 29 and then sent to the receiver 31a. The signal output from the receiver 31a is the fixed contact 28c of the switch 28,
Input to the phase measuring instrument 22 via the movable contact 28a. Therefore, the phase measuring device 22 measures the phase difference between the signal transmitted by wire from the signal transmitting unit 2 and the signal input via the switching device 28 as the second phase difference, and for example, the phase difference. But
At 14 ms, this 14 ms phase difference signal is output to the control unit 1. The control unit 1 reads the 13 ms phase difference signal stored in the memory 33 and then reads the difference from the 14 ms phase difference signal by 14 ms.
Calculate -13ms = 1ms. This is because when the delay amount in the variable delay circuit 32 is 4 ms and the delay amount in the variable delay circuit 21c is 0 ms, the sub central station 29 is more than the phase difference of the normal transmitting station 23c.
It means that the phase difference of is 1 ms more. Therefore,
If the delay amount in the variable delay circuit 21c is set to 1 ms, the phase difference between the normal transmitting station 23c and the sub central station 29 will match.
The phase difference of the sub central station 29 and the phase difference of the normal transmitting stations 23a, 23b are the delay amounts of the variable delay circuits 21a, 21b, 32 of 8ms, 5.4ms, 4ms.
Therefore, the normal transmission stations 23a and 23b, the sub central station 29, and the normal transmission station 23c have the same phase difference.

In this way, by adjusting the transmission delay amounts of all the variable delay circuits 21a to 21c and 32, the transmitters 24a to 24c and 30a can send the same signal at the same time. As described above, when the receiver 31a of the sub central station 29 is used, calibration is performed by using the phase-adjusted station, so that it is possible to adjust with high accuracy, and the accuracy is determined by the phase measurement circuit 22.
It depends only on the accuracy of.

In addition, especially when it is necessary to match the phases with high accuracy, for example, when matching the phases to an error of about 10 μsec, the transmitter 2
The distance difference between 4a to 24c and the phase adjustment receiver 13 causes an error in terms of a difference in propagation time of radio waves. About 10 μsec at this distance difference of 3 km
Error. In this case, it is needless to say that a correction memory is provided for each station, the radio wave propagation time is set as the value, and the specified value is corrected by the value of the correction memory, whereby the accuracy can be further improved.

〔The invention's effect〕

As described in detail above, according to the phase adjusting method of the present invention, only one of the first to Nth transmitting stations is turned on, and the phase adjusting receiver of the central station receives the signal. By measuring the phase difference between the received signal and the transmission signal at the central station and setting the delay amount of the variable delay circuit so that the obtained phase difference becomes a specified value, the phase adjustment can be performed accurately.
Moreover, there is an effect that it can be performed with a simple configuration.

Further, by determining the delay amount set in the variable delay circuit provided for the M-th transmitting station based on the measured difference between the first phase difference and the second phase difference, It is also possible to adjust the phase of a transmitting station located at a distant position.

[Brief description of drawings]

FIG. 1 is a block diagram showing a basic example of a phase adjusting method according to the present invention, FIGS. 2 (a) to 2 (c) are waveform diagrams for explaining the operation of FIG. 1, and FIG. A block diagram showing an embodiment of a phase adjusting system according to the present invention, and FIGS. 4 and 5 are block diagrams showing a conventional phase adjusting system, respectively. 1 ... Control part, 2 ... Signal sending part, 12 ... Receiving antenna, 13 ... Phase adjustment receiver, 21a-21c ... Variable delay circuit, 22 ... Phase measuring device, 23a-23c ... Normal Transmitter station, 24a
〜24c …… Transmitter, 25a〜25c …… Transmission antenna, 26 ……
Receiver, 27 …… Reception antenna, 28 …… Switch, 28d ……
Switching drive unit, 29 ... Sub-central office, 30a ... Transmitter, 30b ...
Transmission antenna, 31a …… Receiver, 31b …… Reception antenna,
32: Variable delay circuit, 33: Memory.

Claims (2)

[Claims] 1. In a multi-station transmission system in which one signal is sent from a central station via a transmitting section from a plurality of transmitting stations at the same radio frequency, when phase adjustment of the first to Nth transmitting stations is performed, Only one transmitting station is turned on and the other transmitting stations are turned off, and a transmission signal from the central station is transmitted from the on state transmitting station through a variable delay circuit provided for the on state transmitting station. Means for transmitting, means for receiving the transmission signal transmitted from this transmitting station at the phase adjustment receiver of the central station, and the received signal received at this phase adjustment receiver and the transmission signal at the central station Means for setting the delay amount of the variable delay circuit so that the obtained phase difference becomes a specified value, a transmitter and a phase adjustment receiver provided as one of the transmitting stations. With the Deputy Central Office consisting of A switching means for switching between a signal received by a receiver in the central office and transmitted by wire to the central office and a received signal of the phase adjusting receiver of the central office, and activating the switching means; The signal received by the phase adjustment receiver of the central office is switched to a signal that is received by the receiver of the sub central office and transmitted by wire to the central office, and the first to Nth transmitting stations are Only the Mth transmitting station far away from another central station is turned on, and the transmission signal from the central station is transmitted through the variable delay circuit provided for the Mth transmitting station. M from the transmitting station, the transmitting signal from the transmitting station is received by the receiver in the sub central station, and is transmitted to the central station by wire, and the transmitted signal and the transmitting signal in the central station are Phase difference of the first phase difference Then, only the transmitter of the sub central station is turned on, and the transmission signal from the central station is transmitted to the transmitter of the sub central station through a variable delay circuit provided for the sub central station. From the transmitter, the transmission signal from the transmitter is received by the receiver in the sub-central office, and is transmitted to the central office by wire, and the phase difference between the transmitted signal and the transmission signal in the central office is calculated. The second phase difference is measured, and the delay amount set in the variable delay circuit provided for the M-th transmitting station is based on the measured difference between the first phase difference and the second phase difference. Phase adjustment method characterized in that it is decided. 2. A central office stores a correction value of a specified value for each station, corrects this specified value for each station, and sets the corrected value in a variable delay circuit. The phase adjustment method described in the first item of the range.