JP2020188308A - Wireless device and wireless system - Google Patents

Abstract

To provide a radio device and a radio system that can practically control the polarization of two-system electromagnetic waves used in communication that uses rotation polarization.SOLUTION: A wireless system that communicates using two-system radio waves in which polarization is rotated at a frequency independent of the frequency of a carrier wave generates two-system carrier waves with different PLL circuits, measures a synthesis result after synthesizing the two-system carrier waves, controls the phase relationship between the two-system carrier waves using a measurement result, and performs a procedure of keeping the phase of polarization rotation within an allowable value after a procedure of keeping the phase of the two-system carrier waves within an allowable value.SELECTED DRAWING: Figure 2B

Description

The present invention relates to a radio that communicates using electromagnetic waves whose polarization rotates at an arbitrary frequency, and a technique for realizing a radio system using the radio.

A large number of devices are connected to the Internet, signals related to the state of the devices are collected, and signals that control the devices based on the contents of the signals are distributed using the Internet, realizing highly efficient operation of various systems whose components are the devices. The concept of the Internet of Things (IoT) is drawing attention.

In wireless communication, good communication can be ensured when there is no obstacle between the transmitter and the receiver and there is a wireless propagation path called a line-of-sight communication path. On the other hand, when such a line-of-sight communication path does not exist, electromagnetic waves are generally partially reflected by obstacles existing in the space surrounding the transmitter / receiver, and other parts invade the inside of the obstacle, and then the obstacle is removed. It penetrates and propagates outside the obstacle again.

In the case of such reflection and transmission to an obstacle, the electromagnetic wave which is a vector wave of a transverse wave is a method of the vector of the electromagnetic wave when the electromagnetic wave is incident on the obstacle and the obstacle at the incident point on the obstacle. It suffers from unique polarization changes determined by the line vector. Since an electromagnetic wave is a transverse wave of a vector wave, the receiver cannot obtain a good received wave unless the change in its polarization is known. This is because the antenna, which is a device that acquires radio waves, generates the maximum received power when the vector direction of the incoming electromagnetic wave and the direction of the current flowing on the antenna match.

Since the radio is installed in a suitable place to obtain the desired signal from the device to be controlled, it is generally impossible to specify its position and direction. Moreover, in the absence of a line-of-sight communication path, it is extremely difficult to know the state of polarization that changes due to reflection and transmission. In other words, it is necessary for the receiver to obtain a signal of the incoming wave of sufficient strength to realize good communication, and by controlling the polarization of the electromagnetic wave used by the transmitter / receiver for communication, the line-of-sight communication path is particularly improved. It is possible to achieve good communication quality in a wireless communication environment in which obstacles exist during the transmission / reception period that cannot be secured.

Rotational polarization communication technology is one of the means for realizing polarization control of a transmitter / receiver. Rotational polarization allows the angle of rotation to be controlled by a commercial digital signal processing device because the polarization rotates at a frequency lower than the carrier frequency, and the transmitter / receiver uses appropriate timing at a time resolution lower than the carrier frequency. By doing so, it becomes possible to use the desired polarization.

Japanese Patent Application Laid-Open No. 2017-046117 (Patent Document 1) is an example of the rotationally polarized wave communication technology. For rotationally polarized waves, it is essential to synchronize the two carriers in order to transmit a signal that is up-converted by a synchronized carrier wave from two spatially orthogonal antennas. Since the frequency used for wireless communication ranges from several hundred MHz to several GHz, it is extremely difficult to control the waveform of signals in this frequency band with a commercial general-purpose digital signal processing device of about 1 GHz from the upper limit of the clock frequency. .. In order to control the characteristics of the electromagnetic waves transmitted by the radio, it is indispensable to introduce a technique in which the radio itself monitors the state of the transmitted electromagnetic waves and keeps the state constant.

In the prior art described in Japanese Patent Application Laid-Open No. 2007-312257 (Patent Document 2) as a technique for controlling a transmission wave in which a radio device monitors the state of a transmission signal to improve communication quality, the radio device includes a folding loop. Then, it is disclosed that the test signal is transmitted and received in the same loop, and the quality of the received signal is used to determine whether or not transmission is possible.

JP-A-2017-046117 Japanese Unexamined Patent Publication No. 2007-312257

In the radio of Patent Document 1, since the carrier waves radiated from the two antennas are generated by a single signal source, the phase synchronization of the carrier waves is easy. However, when the carrier waves are generated by a plurality of independent signal sources, the phase synchronization of the two carrier waves is not guaranteed.

In order to be able to form arbitrary polarized waves using two spatially orthogonal antennas, it is necessary to synchronize the phase of the electromagnetic waves radiated from the two antennas orthogonal to each other in the carrier frequency domain. The carrier frequency used in wireless communication is typically between 300MHz and 3GHz, and controlling two different carrier phases with a commercial digital signal processing device in this frequency domain is a number of digital signal processing clock speeds. It is generally difficult because it goes from GHz to several tens of GHz. For this reason, a means for achieving phase synchronization of two carriers by analog processing is required.

In Patent Document 2, which is a technique for monitoring the state of a transmission signal and controlling a transmission wave, the radio knows the quality of the transmission signal from the reception signal obtained in the loop back, and directly obtains information on the waveform of the transmission signal. It cannot be known, and the polarization of electromagnetic waves used for transmission and reception cannot be directly controlled.

In such a situation, it is necessary to practically control the polarization of two systems of electromagnetic waves used in communication using rotational polarization.

One aspect of the present invention is the case where two radio waves whose polarization is rotated at a frequency independent of the carrier frequency are used and the deviations between the phases of the two carriers and the phases of the polarization rotation are within the permissible values. It is a control method of a wireless system that communicates with a carrier wave.

Another preferable aspect of the present invention is to carry out a procedure for keeping the phase of the two carriers within the allowable value and then a procedure for keeping the phase of the polarization rotation within the allowable value.

A more specific aspect of the present invention is to use the first signal path and the second signal path in order to use two systems of radio waves, and to use the first carrier wave and the second carrier wave as the two carriers. , A first rotationally polarized signal and a second rotationally polarized signal are used to rotate the polarization. In the first signal path, the first carrier wave is supplied by the first PLL circuit, and in the second signal path, the second carrier wave is supplied by the second PLL circuit. In the first signal path, the first rotationally polarized signal and the first known signal are selectively supplied, and in the second signal path, the second rotationally polarized signal and the second known signal are supplied. It is selectively supplied, and an information signal and a third known signal are selectively supplied to the first signal path and the second signal path. Then, when evaluating whether or not the phase deviation of the two carriers is within the allowable value, a third known signal is supplied to the first signal path and the second signal path, and the first signal path is supplied. The first carrier and the first known signal are supplied to the signal path of, the second carrier and the second known signal are supplied to the second signal path, and the signal of the first signal path and the second signal are supplied. Determines if the signals in the signal path of are in phase.

Another preferred aspect of the invention is an information signal generator that produces an information signal, a first and second signal path that splits the information signal into two systems, and a rotational polarization that produces a sine wave. A cosine wave generator, a rotating polarization sine wave generator that generates a sine wave, a first multiplier that synthesizes the cosine wave with a signal flowing in the path in the first signal path, and a second signal path. In, a second multiplier that synthesizes the sine wave with a signal flowing in the path, a first PLL circuit that generates a first carrier, a second PLL circuit that generates a second carrier, and a first In the signal path of, a third multiplier that synthesizes a first carrier with the signal flowing through the path, and a fourth multiplier that synthesizes a second carrier with the signal flowing through the path in the second signal path. A first antenna that radiates a signal from the first signal path into space as a radio wave, a second antenna that radiates a signal from a second signal path into space as a radio wave, and a predetermined training period. It is a radio device including a signal processing circuit that repeats restarting the first PLL circuit and the second PLL circuit a plurality of times.

It is possible to practically control the polarization of two systems of electromagnetic waves used in communication using rotational polarization.

The block diagram of the radio equipment of Example 1. The flow chart which shows the example of the communication protocol of the wireless system of Example 1. FIG. The flow chart which shows the example of the common mode synthesis threshold setting of the wireless system of Example 1. The flow chart which shows the example of another communication protocol of the wireless system of Example 1. FIG. The block diagram of the radio equipment of Example 2. The block diagram of the radio equipment of Example 3. The block diagram of the radio device of Example 4. The block diagram of the radio device of Example 5. The flow chart which shows the example of the communication protocol of the wireless system of Example 5. The block diagram of the radio equipment of Example 6. FIG. 6 is a block diagram of the configuration of the radio of the seventh embodiment. The block diagram of the radio equipment of Example 8. The block diagram of the radio device of Example 9. The block diagram of the radio equipment of Example 10. A transparent perspective view showing an example of an elevator monitoring / control system according to the eleventh embodiment. The block diagram which shows the example of the substation monitoring and control system of Example 12.

The embodiment will be described in detail with reference to the drawings. However, the present invention is not construed as being limited to the description of the embodiments shown below. It is easily understood by those skilled in the art that a specific configuration thereof can be changed without departing from the idea or purpose of the present invention.

In the configuration of the invention described below, the same reference numerals may be used in common among different drawings for the same parts or parts having similar functions, and duplicate description may be omitted.

When there are a plurality of elements having the same or similar functions, they may be described by adding different subscripts to the same reference numerals. However, if it is not necessary to distinguish between a plurality of elements, the subscript may be omitted for explanation.

Notations such as "first", "second", and "third" in the present specification and the like are attached to identify the components, and do not necessarily limit the number, order, or contents thereof. is not. In addition, numbers for identifying components are used for each context, and numbers used in one context do not always indicate the same composition in other contexts. Further, it does not prevent the component identified by a certain number from having the function of the component identified by another number.

The position, size, shape, range, etc. of each configuration shown in the drawings and the like may not represent the actual position, size, shape, range, etc. in order to facilitate understanding of the invention. Therefore, the present invention is not necessarily limited to the position, size, shape, range, etc. disclosed in the drawings and the like.

In the embodiments described below, a means for the radio to examine the waveform of the transmitted signal and control the transmitted wave so that the waveform forms a desired polarization is described.

For example, the transmitter is different from the system in which the first carrier wave is superimposed on the result of multiplying the information signal by a sine wave having a frequency different from that of the first carrier wave, and the information signal is different from the second carrier wave. It has a system in which a second carrier wave is superimposed on the result of multiplying the cosine wave of the frequency. The first carrier wave and the second carrier wave have the same frequency. Then, each of these two systems is provided with a route for branching and synthesizing the outputs, and has a function of measuring the synthesis result. It is possible to control the two carrier wave generation circuits by using the measurement result of the synthesis result, equalize the phases of the two carrier waves, and radiate the outputs of the two carriers into space from two spatially orthogonal antennas. ..

To give another example, the transmitter has a system in which the first carrier wave is superimposed on the result of selectively multiplying the information signal by a sine wave having a frequency different from that of the first carrier wave and a constant wave, and the information signal. It is provided with a system in which the second carrier wave is superimposed on the result of selectively multiplying a sine wave having a frequency different from that of the second carrier wave and a constant wave. The first carrier wave and the second carrier wave have the same frequency. Then, each of these two systems is provided with a route for branching and synthesizing the outputs, and has a function of measuring the synthesis result. Then, the carrier wave generation circuit of the two systems is controlled by using the measurement result when the constants are multiplied for both systems. After equalizing the phases of the carriers of the two systems, the outputs of the two systems when the sine wave and the cosine wave are multiplied for each of the two systems are radiated into space from two spatially orthogonal antennas.

Further, to give another example, the transmitter includes two PLL circuits that generate a carrier wave having the same frequency. Then, a system in which the carrier wave generated in the first PLL circuit is superimposed on the result of selectively multiplying the information signal by a sine wave having a frequency different from that of the carrier wave generated in the PLL circuit and a constant, and the information signal in the PLL circuit. It has a system that superimposes the carrier wave generated by the second PLL circuit on the result of selectively multiplying the cosine wave and the constant of the frequency different from the generated carrier wave. Then, it is provided with a route for branching and synthesizing the outputs of the two systems, respectively, and has a function of measuring the synthesis result. The PLL circuits of the two systems are controlled using the measurement results when the constants are multiplied for both systems, and the PLL circuits are repeatedly stopped and restarted until the phases of the carriers of the two systems are equal. After making the phases of the carriers of the two systems equal, the two systems are multiplied by a sine wave and a cosine wave, and the outputs of the two systems are radiated into space from two spatially orthogonal antennas.

To give another example, the transmitter is provided with two PLL circuits that generate a carrier wave of the same frequency, and a sine wave and a constant having a frequency different from that of the carrier wave generated by the first PLL circuit in the information signal. The system that superimposes the carrier wave generated by the first PLL circuit on the result of selectively multiplying the above, and the information signal is selectively multiplied by a sine wave and a constant with a frequency different from that of the carrier wave generated by the second PLL circuit. It has a system that superimposes the carrier wave generated in the second PLL circuit on the combined result. Then, each of the outputs of the two systems is provided with a route for branching and synthesizing, and has a function of measuring the synthesis result. In addition, it is equipped with a device that stores the threshold value, and the measurement result when the constants are multiplied in both systems is compared with the threshold value, and the PLL circuits of the two systems are stopped and restarted until the measured value exceeds the threshold value. repeat. As a result, after equalizing the phases of the carriers of the two systems, the sine wave and the cosine wave are multiplied for each of the two systems, and the outputs of the two systems are radiated into space from two spatially orthogonal antennas.

Further, to give another example, the transmitter includes two PLL circuits that generate a carrier wave having the same frequency. A system that superimposes the carrier wave generated by the first PLL circuit on the result of selectively multiplying the information signal by a sine wave with a frequency different from that of the carrier wave generated by the first PLL circuit and a constant, and the second on the information signal. It is provided with a system in which the carrier wave generated by the second PLL circuit is superimposed on the result of selectively multiplying the cosine wave and the constant of the frequency different from the carrier wave generated by the PLL circuit of. Then, a route for branching and synthesizing the outputs of the two systems is provided. Further, it has a function of analog-digital conversion of the synthesis result, and has a memory for storing a threshold value inside the CPU. The synthesis result when the constants are multiplied by both systems is analog-digital converted and transferred to the CPU as a digital signal, and the CPU compares the digital signal with the threshold stored in the memory and the two systems until the measured value exceeds the threshold. The phases of the two carriers are made equal by repeating stopping and restarting each of the PLL circuits. After that, a sine wave and a cosine wave are multiplied by each of the two systems, and the outputs of the two systems are radiated into space from two spatially orthogonal antennas.

Further, to give another example, the transmitter includes two PLL circuits that generate a carrier wave having the same frequency. A system in which the carrier wave is superimposed on the result of selectively multiplying the information signal by a sine wave having a frequency different from that of the carrier wave generated in the first PLL circuit and a constant wave, and a carrier wave generated in the second PLL circuit in the information signal. It is provided with a system in which the carrier wave is superimposed on the result of selectively multiplying a cosine wave having a frequency different from that of the sine wave and a constant wave. Further, each of them is equipped with a phase shifter for adjusting the phase of a cosine wave and a sine wave. Further, it is provided with a route for branching and synthesizing the outputs of the two systems, respectively, and has a function of measuring the synthesis result. The PLL circuits of each of the two systems are controlled using the measurement results when the constants are multiplied for both systems, and the PLL circuits are repeatedly stopped and restarted until the phases of the carriers of the two systems are equal. Make the carriers equal in phase. After that, the phase shifters of the two systems are controlled by using the measurement results of the outputs of the two systems when the sine wave and the cosine wave are multiplied by each of the two systems, and the sine wave and the cosine wave of the two systems are controlled. It radiates into space from two spatially orthogonal antennas so that the phase is π / 2.

Further, to give another example, the transmitter includes two PLL circuits that generate a carrier wave having the same frequency. A system in which the carrier wave is superimposed on the result of selectively multiplying the information signal by a sine wave having a frequency different from that of the carrier wave generated in the first PLL circuit and a constant wave, and a carrier wave generated in the second PLL circuit in the information signal. It is provided with a system in which the carrier wave is superimposed on the result of selectively multiplying a cosine wave having a frequency different from that of the sine wave and a constant wave. The two systems each have a function of selecting from a set of cosine waves and a set of sine waves having initial phases in which the cosine wave and the sine wave are different in advance. Further, it is provided with a route for branching and synthesizing the outputs of the two systems, respectively, and has a function of measuring the synthesis result. The PLL circuit of each of the two systems is controlled using the measurement result when the constants are multiplied for both systems, and the phase of the two carriers is repeatedly stopped and restarted until the phases of the two carriers are equal. To be equal. After that, using the measurement results of the output of the two systems when the cosine wave and the sine wave of different initial phases are sequentially selected for each of the two systems and the sine wave and the sine wave are multiplied, each of the two systems is a phase shifter. To control. Then, the two antennas that are spatially orthogonal to each other are radiated into space so that the phases of the two sine waves and the cosine waves are π / 2.

In this embodiment, the configuration of a radio device that allows the transmitter / receiver to use the desired polarized wave using the rotationally polarized wave, and its operation will be described.

FIG. 1 is a block diagram illustrating a configuration of a radio device of this embodiment. The rotary polarization radio 101 includes an information signal generator 1 and a synchronous measurement signal generator 2. The information signal switcher 3 is controlled by a signal processing circuit 9, and the information signal generator 1 and the synchronous measurement signal generator 2 are used. Switch. The output of the information signal switch 3 is split into two, one is multiplied by the output of the first waveform signal switch 15 by the first multiplier 17, and the other is switched the second waveform signal by the second multiplier 18. It is multiplied by the output of the vessel 16.

The information signal generator 1 generates the information signal ω _I , and the synchronous measurement signal generator 2 generates the known training signal ω _T at a frequency similar to ω _I. ω _T is, for example, an all “1” signal.

The signal processing circuit 9 is, for example, a microcomputer, and controls the operation of the rotating polarization radio 101 based on a predetermined program. The control may be performed by software or hardware.

The first waveform signal switch 15 switches the outputs of the rotationally polarized cosine wave generator 11 and the first weight constant generator 13. The second waveform signal switch 16 switches the outputs of the rotationally polarized sine wave generator 12 and the second weight constant generator 14. The rotating polarization sine wave generator 11 produces cos (ω _p + θ ₁ ), and the rotating polarization sine wave generator 12 produces sin (ω _p + θ ₁ ). These generate sin waves that are 90 degrees out of phase and rotate the polarization. The first weight constant generator 13 and the second weight constant generator 14 generate a known signal (eg, all “1”) at a frequency similar to ω _p .

The respective outputs of the first multiplier 17 and the second multiplier 18 are the outputs of the first PPL device 23 and the second PLL device 24 by the third multiplier 21 and the fourth multiplier 22. Multiplies with a carrier. The first PLL device 23 and the second PLL device 24 are controlled by the signal processing circuit 9.

Part of the output of the third multiplier 21 and the fourth multiplier 22 is branched to become the input of the synthesizer 25. The output of the synthesizer 25 becomes the input of the high frequency signal measuring device 4, and the output of the high frequency signal measuring device 4 is input to the signal processing circuit 9. Most of the output of the third multiplier 21 and the fourth multiplier 22 is radiated into space by the first antenna 41 and the second antenna 42, which are spatially orthogonal to each other, and become rotationally polarized.

Here, the signal ω _I from the information signal generator 1 is an information signal to be transmitted from the radio to another radio. The signal ω _p from the rotationally polarized cosine wave generator 11 and the rotationally polarized sine wave generator 12 is the rotational frequency at which the rotationally polarized waves are rotated. The signal ω _c from the first PPL device 23 and the second PLL device 24 is a carrier frequency, for example, ω _I << ω _p << ω _c .

When designing and manufacturing a circuit on a zero basis, the first PPL device 23 and the second PLL device 24 that generate a carrier wave branch a signal generated by a single device as seen in Patent Document 1. Can be used. However, in order to reduce design and manufacturing costs, it may be desirable to utilize existing circuits, in which case two independently operating PPL devices may have to be used. Since the initial phase of the carrier wave generated by the PPL device is random, the phase synchronization of the electromagnetic waves radiated from the two antennas 41 and 42 is not guaranteed when the carrier frequency generated by the two PPL devices is used. In this embodiment, a configuration that solves this problem is proposed.

Currently the mainstream radios generate carrier frequencies with a PLL that uses both digital signal processing and analog signal processing. Since the PLL determines the generation frequency by a feedback loop, the convergence time of the loop varies depending on the characteristics of the PLL device and the environment (temperature, humidity, vibration, etc.) in which the PLL device is placed. Since the signal generated by the PLL device is a sine wave and has periodicity, it is considered that the various convergence times are randomly distributed within the period. Therefore, if multiple start / stop / restart processes are repeated for different PLLs in each system, a sine wave in which both PLLs are generated within an appropriate allowable phase error in the same process. Alternatively, it is considered that there is a timing at which the phases of the cosine waves match.

By using the above operation process, the phases of two independent carriers can be practically matched. In this embodiment, it is possible to realize control of polarization at the frequency of polarization rotation and the frequency of the information signal used in communication using rotational polarization with a commercial digital signal processing device.

As an example of implementation, information signal generator 1, synchronous measurement signal generator 2, information signal switch 3, high frequency signal measuring instrument 4, signal processing circuit 9, first multiplier 17, second multiplier 18, rotation Polarized cosine wave generator 11, first weight constant generator 13, first waveform signal switch 15, rotating polarization sine wave generator 12, second weight constant generator 14, second waveform signal switching The device 16 is included in the digital circuit block 19 and is realized in one LSI (large scale integration). Further, the first PPL device 23 and the second PLL device 24 are realized in independent LSIs.

FIG. 2A is an example of a communication protocol at the time of transmission of the wireless system using the radio of FIG. Overall control shall be performed by the signal processing circuit 9. First, the antenna switch is turned off, and transmission from the first antenna 41 and the second antenna 42 is stopped (S201).

Next, the process for synchronizing the phases of the electromagnetic waves radiated from the first antenna 41 and the second antenna 42 is started. This processing is performed as a training period under the control of the signal processing circuit 9, for example, before normal transmission. The information signal switch 3 selects the output of the synchronous measurement signal generator 2 (S202). The output of the synchronous measurement signal generator 2 is a synchronous signal (information signal band frequency training signal) having only a lower frequency component than the information signal which is the output of the information signal generator 1.

Rotational polarization frequency constant amplitude signal (constant value) that is the output of the first weight constant generator 13 and the second weight constant generator 14 by the first waveform signal switch 15 and the second waveform signal switch 16. ) Is selected (S203). The first multiplier 17 and the second multiplier 18 allow the first weight constant, which is the output of the first weight constant generator 13, and the second weight constant, which is the output of the second weight constant generator 14. Is multiplied by the sync signal. Next, the common mode synthesis threshold value is set to detect the synchronization of the two PLLs (S204).

FIG. 2B is a diagram showing a sequence for setting the in-phase synthesis threshold. The signal processing circuit 9 resets the first PPL device 23 and the second PLL device 24 (S901), and starts oscillating the two PLLs (S902). The outputs of the first multiplier 17 and the second multiplier 18 are the same frequency carrier generated by the first PLL device 23 and the second PLL device 24, respectively, and the third multiplier 21 and the fourth. Is multiplied by the multiplier 22 of. Since the outputs of the first multiplier 17 and the second multiplier 18 are basically known, the outputs of the third multiplier 21 and the fourth multiplier 22 are mainly the first PLL device 23. And the signal state of the second PLL device 24 is reflected.

Part of the output of the third multiplier 21 and the fourth multiplier 22 is branched, added in phase by the synthesizer 25, and its intensity (combined signal amplitude) is measured by the high frequency signal measuring instrument 4 in the carrier frequency band. Be done (S903). The measurement result is input to the signal processing circuit 9 and stored (S904). The maximum of the recorded composite signal amplitudes is updated (S905). The above series of operations (S901 to S905) is repeated a predetermined number of times (S906).

As described above, if the process of starting, stopping, and restarting the PLLs of different systems is repeated, it is considered that the phases of the transport frequencies of the two systems having random phases have a predetermined probability of matching. .. The timing can be detected by the addition signal of the two transport frequencies taking a predetermined value. That is, when the transport frequencies of the two systems are in phase, the amplitude of the added signal is theoretically twice that of the signal of the one system.

In order to detect the timing of the in-phase, the process of starting / stopping / restarting the PLL is repeated a predetermined number of times, and the maximum amplitude is stored in the signal processing circuit 9 (S901 to S906). If the start / stop / restart process is repeated enough, it can be estimated that the phases of the two PLLs are synchronized under the condition that the maximum amplitude is obtained. Therefore, an in-phase composite threshold value for detecting the detected maximum amplitude may be set (S907), and the in-phase may be determined at the timing when the maximum amplitude is detected next using this threshold value. By this method, the signal processing circuit 9 can detect that the two carriers are in phase based on the output of the high frequency signal measuring instrument 4.

Referring to FIG. 2A, after setting the in-phase synthesis threshold (S204), the signal processing circuit 9 resets the first PPL device 23 and the second PLL device 24 (S205), and the two PLLs Start oscillation (S206). The outputs of the first multiplier 17 and the second multiplier 18 are the same frequency carrier generated by the first PLL device 23 and the second PLL device 24, respectively, and the third multiplier 21 and the fourth. Is multiplied by the multiplier 22 of. Since the outputs of the first multiplier 17 and the second multiplier 18 are basically known, the outputs of the third multiplier 21 and the fourth multiplier 22 are mainly the first PLL device 23. And the signal state of the second PLL device 24 is reflected.

Part of the output of the third multiplier 21 and the fourth multiplier 22 is branched and added in phase by the synthesizer 25. Its intensity (combined signal amplitude) is measured in the carrier frequency band by the high-frequency signal measuring instrument 4 (S207). The measurement result is compared with the common mode synthesis threshold (S208). As a result of comparison with the in-phase synthesis threshold value, if the threshold value is not exceeded, the first PLL device 23 and the second PLL device 24 are reset (S205) and restarted (S206), and the result is measured (S207). Then, the same operation is repeated.

As a result of comparison with the in-phase synthesis threshold value, the oscillation of the two PLL devices 23 and 24 is maintained when the threshold value is exceeded. The output of the rotationally polarized cosine wave generator 11 and the rotationally polarized sine wave generator 12 is selected by the first waveform signal switch 15 and the second waveform signal switch 16 (S209). Then, the antenna switch is turned on (S212), and the output of the information signal generator 1 is selected by the information signal switch 3 (S213). The timing of turning on the antenna switch (S212) may be after the output of the information signal generator 1 is selected (S213).

As a result, the carrier waves synchronized from the spatially orthogonal first antenna and the second antenna are modulated by cosine waves and sine waves, and the rotational polarization in which the same information signal is superimposed on these modulated waves is in the air. Is formed in.

The in-phase synthesis threshold setting process (S204) does not need to be performed each time transmission is performed. It may be performed only once when the rotationally polarized wave radio 101 is installed. Alternatively, as described later, the in-phase synthesis threshold setting process may be separately performed to set the threshold in advance.

FIG. 2C is an example of another communication protocol. The same processing as in FIG. 1A will be omitted with reference to the same reference numerals. S209 to S211 of FIG. 2C are processes for confirming that the rotational polarization frequencies sin and cos are orthogonal (the phase is synchronized between sin and cos) after the PLL has a phase. The rotationally polarized cosine wave generator 11 and the rotationally polarized sine wave generator 12 should be in phase synchronization as long as the signals are generated based on the same signal source. However, if a phase shift occurs in these for some reason, the carrier frequency ω _c is higher than the rotational polarization frequency ω _p, so that the phase shift of the composite signal can be corrected by adjusting the phase of the carrier wave. The causes of the phase shift of the rotational polarization frequency are, for example, the difference in the coupling line between the digital circuit block (baseband circuit BB) 19 and the third multiplier 21 and the fourth multiplier 22, and the third multiplier. Individual differences between 21 and the fourth multiplier 22 are possible.

Practically, it is desirable to evaluate "the signal of the product of the two-system PLL signal and the polarization rotation signal" as the target of phase adjustment. As a process for that, after the PLLs are out of phase, the first waveform signal switch 15 and the second waveform signal switch 16 are transferred from the rotating polarization cosine wave generator 11 and the rotation polarization sine wave generator 12. Select the signal of (S209). The cosine wave and sine wave superimposed on the carrier wave are combined by the synthesizer 25, and the amplitude is measured by the high frequency signal measuring device 4 (S210). When the phases of the cosine wave and the sine wave are synchronized (when both are sin waves shifted by π / 2), the amplitudes of these combined signals satisfy the predetermined conditions. Therefore, the phase synchronization is confirmed by this determination. Can be done (S211). The amplitude condition may be obtained in advance by simulation or actual measurement. For example, the condition of the maximum amplitude at the time of phase synchronization of the sine wave and the cosine wave is obtained. Alternatively, the minimum value of the combined signal amplitude is obtained by the same processing as the in-phase synthesis threshold setting process (S204), the quadrature phase synthesis threshold for detecting the minimum value is set, and the phase synchronization is confirmed using the threshold. You may.

Strictly speaking, in the above case, the signals obtained from the two systems are multiplied by the sine wave / cosine wave and the carrier wave.
cos (ω _p + θ ₁ ) * cos (ω _c + φ ₁ ) and sin (ω _p + θ ₁ ) * cos (ω _p + φ ₂ )
That is,
cos (ω _p + θ ₁ ) * cos (ω _c + φ ₁ ) = cos (ω _p + θ ₁ + ω _c + φ ₁ ) + cos (ω _p + θ ₁ -ω _c -φ ₁ )
and,
sin (ω _p + θ ₁ ) * cos (ω _c + φ ₁ ) = -sin (ω _p + θ ₁ + ω _c + φ ₁ ) + sin (ω _p + θ ₁ -ω _c -φ ₁ )
This means that the two signals are compared (the frequency and amplitude of the sine wave / cosine wave and the carrier wave are different).

If the phase synchronization of the signals from the rotationally polarized cosine wave generator 11 and the rotationally polarized sine wave generator 12 can be confirmed (yes in S211), turn on the antenna switch (S212) and switch the information signal. 3 selects the output of the information signal generator 1 (S213), and communication becomes possible. When the phase synchronization cannot be confirmed (no in S211), the first waveform signal switch 15 and the second waveform signal switch 16 are the first weight constant generator 13 and the second weight constant generator 14. Select the signal from and return to process S205 to readjust the phase of the PLL.

In principle, the rotating polarization cosine wave generator 11 and the rotation polarization sine wave generator 12 are always in operation, and are switched by the first waveform signal switch 15 and the second waveform signal switch 16. Therefore, by readjusting the phase of the PLL, the phase of the multiplied signal of the sine wave / cosine wave and the carrier wave is adjusted.

In the above processing, synchronization of the carrier frequency is the most important, and the idea is that a shift in the rotation phase having a low frequency is allowed in the transmitted radio wave. The loop processing added in FIG. 2B is, so to speak, a final check, and it is meaningful to confirm the correct operation of the rotating polarization cosine wave generator 11 and the rotation polarization sine wave generator 12.

It should be noted that the final phase of the rotationally polarized wave can be easily adjusted by performing the process of keeping the phase of the polarization rotation within the allowable value after the process of keeping the phase of the carrier wave within the allowable value. According to the inventor's examination, it is algorithmically difficult to synchronize the phase of the signal of the product of the PLL signal of the two systems and the polarization rotation signal unless the phases of the carrier waves are close to each other to some extent.

According to this embodiment, since the information signal can be transferred by the electromagnetic wave in which the polarization that can be controlled by the commercial general-purpose digital signal processing device is rotated, the line-of-sight communication path exists by using the optimum polarization for the transmitter / receiver. Good communication quality can be achieved in a wireless environment that does not.

Although the configuration on the receiving side is not mentioned above, the rotational polarization technique described in Patent Document 1 (Japanese Patent Laid-Open No. 2017-046117) or the like can be applied to reception.

FIG. 3 is another example illustrating the configuration of a radio that allows the transmitter / receiver to use the desired polarization using rotationally polarized waves. The difference between the rotary polarization radio 102 and the rotary polarization radio 101 in FIG. 1 is that the high-frequency signal measuring instrument 4 is replaced by the analog / digital converter 5 and the digital signal bus 6, and the analog output of the synthesizer 25 is a digital output. It is a point that is converted to and input to the signal processing circuit 9. The signal processing circuit 9 can use, for example, a microcomputer, and can process a digital signal with high resolution and high speed.

According to this embodiment, the in-phase composite intensity of the two high-frequency signals output from the synthesizer 25 can be detected with higher resolution than that of the embodiment of FIG. Therefore, the time for the signal processing circuit 9 to find the time when the phases of the carriers of the two systems can be regarded as the same is shortened, which is effective in improving the throughput of the wireless communication system using the radio.

FIG. 4 is another example illustrating the configuration of a radio that allows the transmitter / receiver to use the desired polarization using rotationally polarized waves. The difference between the rotary polarization radio 103 and the rotary polarization radio 101 in FIG. 1 is that a threshold generation circuit 29 and a comparator 39 are newly installed, and the output of the high frequency signal measuring device 4 is the output of the threshold generation circuit 29. Is compared by the comparator 39, and the comparison result is input to the signal processing circuit 9.

The threshold value generation circuit 29 stores a threshold value for detecting the maximum value or the minimum value of the combined signal strength measured by the high-frequency signal measuring device 4 when two carriers are synthesized in phase in advance. For example, when two carriers are a sine wave or a chord wave having a maximum value of 1 and a minimum value of -1, the maximum value of the combined signal at the time of in-phase is 2 and the minimum value is -2. These values may be obtained in advance by experiments or simulations.

At the time when the comparator 39 detects a predetermined maximum or minimum value of the combined signal of the two carriers that are the outputs of the comparator 25, it can be considered that the two carriers are in phase. Therefore, unlike the embodiment of FIG. 1, it is not necessary to set the threshold value in the device, so that the processing time of the signal processing circuit 9 is shortened as compared with the embodiment of FIG. 1, and wireless communication using a radio is used. It is effective in improving the throughput of the system.

FIG. 5 is another example illustrating the configuration of a radio that allows the transmitter / receiver to use the desired polarization using rotationally polarized waves. The difference between the rotating polarization radio 104 and the rotating polarization radio 102 of FIG. 3 is that a threshold generation circuit 29 is newly installed and a temporary storage circuit 49 is secured in the signal processing circuit 9.

The output of the threshold generation circuit 29 is stored in the temporary storage circuit 49 inside the signal processing circuit 9, and the strength of the signal obtained by synthesizing the two carriers input from the digital signal bus 6 is higher than that at the time of in-phase synthesis. It becomes possible to judge at high speed whether there is a divergence. Therefore, the time for finding the time when the phases of the two carriers can be regarded as the same is significantly shortened as compared with the embodiment of FIG. 3, which is effective in improving the throughput of the wireless communication system.

In this embodiment, the operation of the radio device in which the transmitter / receiver can use the desired polarized wave by using the rotationally polarized wave will be described. In this embodiment, the phase of the signals from the rotationally polarized cosine wave generator 11 and the rotationally polarized sine wave generator 12 can be adjusted.

FIG. 6 is another example of a diagram illustrating a configuration of a radio that allows the transmitter / receiver to use the desired polarization using the rotationally polarized waves of the embodiment. FIG. 7 is an example of a communication protocol of a wireless system using the radio of FIG.

The difference between the rotating polarization radio 105 of FIG. 6 and the rotating polarization radio 101 of FIG. 1 is that the first polarization rotation frequency band phase shifter 31 and the second polarization rotation frequency band phase shifter are newly provided. 32 are inserted between the first waveform signal switch 15 and the rotating polarized cosine wave generator 11 and between the second waveform signal switching device 16 and the rotating polarized sine wave generator 12, respectively. Both are installed in the digital circuit block 19 and controlled by the signal processing circuit 9.

In this embodiment, after performing the same operation as in the embodiment of FIG. 1 and assuming that the two carriers are in phase, the signal processing circuit 9 is, in principle, the first PLL device 23 and the second PLL device 24. Is not controlled. After selecting the outputs of the rotationally polarized cosine wave generator 11 and the rotationally polarized sine wave generator 12 by the first waveform signal switch 15 and the second waveform signal switch 16, the processing described with reference to FIG. 2C is performed. If it is detected that the phases of the two do not match, these phases are controlled as necessary.

In FIG. 7, the same processing as in FIG. 2C is designated by the same reference numerals, and the description thereof will be omitted. As shown in the protocol of FIG. 7, after the carrier phases are matched (yes in S208), the signal processing circuit 9 selects the signals from the rotating polarization cosine wave generator 11 and the rotating polarization sine wave generator 12. (S209). Similar to FIG. 2C, the cosine wave and the sine wave are combined by the synthesizer 25, the amplitude multiplied by the carrier wave is measured by the high frequency signal measuring device 4 (S210), and the phase synchronization of the combined signal is confirmed (S211).

If phase synchronization can be confirmed (yes of S211), turn on the antenna switch (S212), select the information signal band frequency information signal ω _I (S213), and select the rotationally polarized sine wave signal, rotatedly polarized cosine wave signal, and carrier wave. It can be combined with the signal and transmitted from the antennas 41 and 42.

If the phase synchronization between the cosine wave and the sine wave cannot be confirmed (no in S211), the polarization rotation frequency that is the input of the first multiplier 17 and the second multiplier 18 according to the predetermined rule in the signal processing circuit 9. Change the phase of the cosine wave and sine wave of the band (S701). Then, the intensity is measured in the carrier frequency band by the high frequency signal measuring device 4 (S210). According to a predetermined rule, for example, the phase amounts of the first polarization rotation frequency band phase shifter 31 and the second polarization rotation frequency band phase shifter 32 are changed by a predetermined amount.

If the combined signal amplitude satisfies the predetermined condition for any of the phase quantities (yes of S211), the antenna switch is turned ON (S212), the information signal band frequency information signal ω _I is selected (S213), and the antenna 41 , 42 can be transmitted.

If the phases do not match even after selecting all the changes (no in S702), use the first polarization rotation frequency band phase shifter 31 and the second polarization rotation frequency band phase shifter 32. We give up adjusting the phase and respond by restarting the PLL as in FIG. 2B.

If all the change amounts are not selected, the phase amount is changed until all the predetermined phase change conditions are satisfied (yes of S702).

Through the above process, the signal processing circuit 9 learns that the output of the high-frequency signal measuring instrument 4 has fallen below a predetermined threshold, for example, and at that stage, the first polarization rotation frequency band phase shifter 31 and the second polarization The value of the rotation frequency band phase shifter 32 is fixed, and the output of the information signal generator 1 is selected by the information signal switch 3 (S211). As a result, the carriers synchronized from the first antenna and the second antenna that are spatially orthogonal are modulated by the cosine wave and the sine wave of the same polarization rotation frequency, and the same information signal is superimposed on these modulated waves. Rotational polarization is formed in the air.

In the above embodiment, the phase of the product of the sine wave and the cosine wave of the carrier wave and the polarization rotation frequency is as close as possible to the state where the phase of the carrier wave is equal and the sine wave and the cosine wave of the polarization rotation are exactly π / 2 shifted. Allows you to.

According to this embodiment, the degree of orthogonality between the sine waveform and the cosine waveform in the polarization rotation frequency band forming the rotationally polarized wave is improved as compared with the embodiment of FIG. 1, so that the stability of the polarization rotation is improved. This is effective in improving the accuracy of polarization control of the transmitter / receiver.

In the above, it is assumed that the threshold value for determining the condition of the processing S211 is preset in the signal processing circuit 9. As another method, the loop processing of the processing S701 and the processing S702 is performed until all the change amounts are selected, and the measurement result is input to the signal processing circuit 9 and stored. The signal processing circuit 9 stores the measurement result and sets, for example, a threshold value for detecting the minimum output.

Through the above processing, the signal processing circuit 9 knows the minimum output of the high-frequency signal measuring instrument 4, and then the first polarization rotation frequency band phase shifter 31 and the second polarization rotation frequency are obtained under the condition that the minimum output is obtained. The value of the band shifter 32 is fixed, and the output of the information signal generator 1 is selected by the information signal switcher 3. As a result, the carrier waves synchronized from the first antenna and the second antenna, which are spatially orthogonal to each other, are modulated by a cosine wave and a sine wave having the same polarization rotation frequency without the need to set a threshold value in advance. A rotationally polarized wave in which the same information signal is superimposed on a wave is formed in the air.

FIG. 8 is another example of the figure illustrating the configuration of a radio that allows the transmitter / receiver to use the desired polarization using the rotationally polarized waves of the embodiment.

The difference between the rotationally polarized wave radio 106 of FIG. 8 and the rotationally polarized wave radio 102 of FIG. 2 is that the rotationally polarized cosine wave switch 33 and the rotationally polarized sine wave switch 34 are newly installed in the digital circuit block 19. , A rotating polarized cosine wave array 35, and a rotating polarized sine wave array 36. The rotating polarization cosine wave switching device 33 and the rotating polarization sine wave switching device 34 are controlled by the signal processing circuit 9. A rotatingly polarized cosine wave array 35 and a rotatingly polarized sine wave array 36 are combined with the rotatingly polarized cosine wave switch 33 and the rotatingly polarized sine wave switch 34, respectively, to form a set of rotatingly polarized sine wave and rotational bias. A wave sine wave couples to the inputs of the first waveform signal switch 15 and the second waveform signal switch. With this configuration, when the number of arrays is n, sine waves and cosine waves are supplied in n × n combinations (9 in the case of FIG. 8).

In this embodiment, after performing the same operation as in the embodiment of FIG. 2 and assuming that the two carriers are in phase, the signal processing circuit 9 controls the first PLL device 23 and the second PLL device 24. Is not done in principle. Instead, the rotating polarized cosine wave switch 33 and the rotating polarized sine wave switch 34 provide a set of rotating polarized cosine waves from the rotating polarized cosine wave array 35 and the rotating polarized sine wave array 36. A rotating polarized sine wave is selected. In general, the rotationally polarized cosine wave array 35 and the rotationally polarized sine wave array 36 include the rotationally polarized cosine wave and the rotationally polarized sine wave, which have different initial phases, but are constant by making it possible to output a plurality of combinations. It is possible to select a combination that is in phase (or close to) with the probability of.

In the example of FIG. 6, in order to adjust the phases of the sine wave and the cosine wave, the first polarization rotation frequency band phase shifter 31 and the second polarization rotation frequency band phase shifter 32 were used. In the embodiment, the rotationally polarized cosine wave and the rotationally polarized sine wave that are the inputs of the first multiplier 17 and the second multiplier 18 are changed by combining a plurality of signal sources prepared in advance.

The intensity of the changed rotationally polarized cosine wave and rotationally polarized sine wave is measured in the carrier frequency band by the high-frequency signal measuring instrument 4. The measurement result is input to the signal processing circuit 9 and stored. The signal processing circuit 9 stores the measurement results, selects another set of rotationally polarized cosine waves and rotationally polarized sine waves, and repeats the same operation.

By repeating the operation, the signal processing circuit 9 knows, for example, the minimum output of the high-frequency signal measuring instrument 4, and when the minimum output is obtained, the rotationally polarized cosine wave and the rotationally polarized sine wave are fixed and the information signal switch 3 Selects the output of information signal generator 1 by. As a result, the carriers synchronized from the first antenna and the second antenna that are spatially orthogonal are modulated by the cosine wave and the sine wave of the same polarization rotation frequency, and the same information signal is superimposed on these modulated waves. Rotational polarization is formed in the air.

According to this embodiment, the degree of orthogonality between the sine waveform and the cosine waveform in the polarization rotation frequency band that forms the rotational polarization is improved as compared with the embodiment of FIG. 2, so that the stability of the polarization rotation is improved. This is effective in improving the accuracy of polarization control of the transmitter / receiver.

FIG. 9 is another example of the figure for explaining the configuration of a radio that allows the transmitter / receiver to use the desired polarization using the rotationally polarized waves of this embodiment.

The difference between the rotary polarization radio 107 and the rotary polarization radio 105 in FIG. 6 is that the second information signal switch 7 newly controlled by the synchronization signal generation circuit 8 and the signal processing circuit 9 is a digital circuit block 19 The output ω _I of the information signal generator 1 and the output ω _S of the synchronization signal generator 8 are selected by the second information signal switch 7 and become the input of the information signal switch 3.

In FIG. 7 of Example 5, the two carriers are synchronized, and after the antenna switch is turned ON (S212), the synchronization signal generation circuit 8 is used to synchronize with other radios of the communication partner, and information The output data of the signal generator 1 is transferred to the other radio.

Depending on the application of the wireless system, it is necessary to synchronize the time between the radios that communicate with each other. This is usually necessary especially when performing 1-to-N communication such as a sensor net. In this case, by transmitting the synchronization signal ω _S before transmitting the information signal, one parent radio and N child radios can synchronize the time. According to this embodiment, a wireless communication system using rotationally polarized waves can be represented.

FIG. 10 is another example of the figure for explaining the configuration of a radio that allows the transmitter / receiver to use the desired polarization using the rotationally polarized waves of this embodiment.

The difference between the rotary polarization radio 108 and the rotary polarization radio 102 in FIG. 3 is that the second analog-digital converter 51 and the third analog-digital converter 53 are newly installed in the digital circuit block 19. It is a point to be done. Its inputs are the branch output of the third multiplier 21 and the branch output of the fourth multiplier 22, and each output is a signal processing circuit by the second digital signal bus 52 and the third digital signal bus 54. Enter in 9.

According to this embodiment, in the same operation as in the second embodiment, the signal processing circuit 9 can know the difference in the output signal strength of the two systems, and the condition that the carrier waves of the two systems are in phase is the output of the two systems. It is possible to correct by the difference in signal strength, and it is possible to shorten the time until the timing at which the two carriers are in phase is obtained, which is effective in improving the throughput of the wireless communication system.

FIG. 11 is another example of the figure for explaining the configuration of a radio that allows the transmitter / receiver to use the desired polarized wave using the rotationally polarized wave of this embodiment.

The difference between the rotating polarization radio 109 and the rotating polarization radio 105 of FIG. 6 is that it is newly provided with a first transmission output switch 27 and a second transmission output switch 28 controlled by the signal processing circuit 9. Is.

In this embodiment, when the same operation as that of the embodiment of FIG. 1 or FIG. 9 is performed, power is suppressed from being radiated into the space until the two carriers can be regarded as in-phase. According to this embodiment, when data is wirelessly transmitted to another wireless device, the wireless interference given to the other wireless device can be reduced, which is effective in improving the communication quality of the wireless communication system.

FIG. 12 is another example of the figure for explaining the configuration of a radio that allows the transmitter / receiver to use the desired polarization using the rotationally polarized waves of this embodiment.

The difference between the rotating polarization radio 110 and the rotating polarization radio 106 in FIG. 8 is that the first weight constant switch 55, the second weight constant switch 56, and the first weight constant switch 56 are newly installed in the digital circuit block 19. The weight constant array 57 and the second weight constant array 58 are provided, and the first weight constant switch 55 and the second weight constant switch 56 are controlled by the signal processing circuit 9.

The first weight constant switch 55 and the second weight constant switch 56 are connected to the first weight constant array 57 and the second weight constant array 58, respectively, and a set of the same weight constants is the first. It is coupled to the input of the waveform signal switch 15 and the second waveform signal switch.

In this embodiment, when the same operation as in FIG. 8 is performed, a specific weight constant is selected in advance from the first weight constant array 57 and the second weight constant array 58. The weight constants stored in the first weight constant array 57 and the second weight constant array 58 are prepared to show different properties with respect to radio propagation characteristics such as DC component and periodicity.

When the same operation as in the embodiment of FIG. 8 is performed to synchronize the carrier waves and the result of transmitting the data is not satisfactory, the data propagation characteristics can be improved by changing the weight constant and performing the same operation as in FIG. There is sex. According to this embodiment, it is possible to improve the data transmission quality by adapting to the wireless environment operated by the rotatingly polarized radio communication system.

FIG. 13 is an example of a configuration diagram of an elevator monitoring / control system to which a wireless system that reduces the influence of a specific propagation path and improves communication quality by using rotationally polarized waves is applied.

In the elevator monitoring / control system 1100 of this embodiment, a plurality of elevator baskets 1111 move up and down inside the building 1101 where the elevator is installed. A base station rotating polarization radio 1103 having a rotational polarization function and a base station 2 orthogonal polarization integrated antenna 1102 are coupled and installed on the floor and ceiling inside the building 1101. Terminal station 2 orthogonally polarized integrated antennas 1112 are installed on the external ceiling and external floor of the elevating basket 1111, respectively, and are connected to the wireless terminal 1113 using a high-frequency cable 1114.

Since the base station rotating polarization radio 1103 and the wireless terminal 1113 use the inside of the building 1101 as a wireless transmission medium, electromagnetic waves are repeatedly reflected by the inner wall of the building 1101 and the outer wall of the elevator, and the plurality of wireless terminals 1113 The polarization of the transmitted electromagnetic waves when they reach the base station rotating polarization radio 1103 is not the same. In addition, since the elevating basket changes its relative position, when the base station rotating polarized wave radio 1103 and the wireless terminal 1113 perform wireless communication when the elevator is stopped, the base station is transmitted from a plurality of wireless terminals 1113 each time. The polarization of electromagnetic waves reaching the rotationally polarized radio 1103 generally varies.

According to this embodiment, the wireless channel measurement mode and the data transmission mode are processed within the time when the base station rotating polarization radio 1103 and the wireless terminal 1113 fix the relative positions, so that the relative fixed positions are determined. In an elevator system that is difficult to predict, highly reliable wireless communication can be performed between the elevator and a fixedly installed rotating polarization radio. Therefore, the lifting basket 1111 can be controlled and monitored remotely from the building 1101 without using a wired connection means. As a result, the wired connection means such as a cable can be deleted, the same transport capacity can be realized with a smaller building volume, or the transport capacity can be improved by increasing the elevator size with the same building volume.

FIG. 14 is an example of a configuration diagram of a substation equipment monitoring / control system to which a wireless system that uses rotationally polarized waves to reduce the influence of a specific propagation path and improve communication quality is applied.

The substation equipment monitoring / control system 1200 of this embodiment includes a plurality of substations 1201, and the substation 1201 is installed by combining the wireless terminal 1203 and the wireless terminal 2 orthogonally polarized light integrated antenna 1202. A radio base station 1211 is set up in the vicinity of a plurality of transformers 1201, and the radio base station 1211 integrates a rotationally polarized wave radio 1213 and a rotationally polarized wave radio 2 orthogonally polarized light that transmit and receive the rotationally polarized light of the embodiment described above. Antenna 1212 is combined and installed.

The dimensions of the transformer are on the order of several meters, which is overwhelmingly larger than the wavelengths corresponding to several hundred MHz to several GHz, which are the frequencies of electromagnetic waves used by radios. For this reason, electromagnetic waves are subjected to multiple reflections by the plurality of transformers 1201, a multiple wave interference environment is formed, and the transmitted waves from the wireless terminal 1203 fixedly installed in each transformer 1201 have different polarizations and are radio base stations. It reaches the rotating polarization radio 1213 installed in 1211.

According to this embodiment, highly reliable wireless communication can be performed between the rotating polarization radio 1213 and the plurality of wireless terminals 1203. Therefore, it is possible to remotely control and monitor the transformer 1201 by a plurality of wireless base stations 1211 without using a wired connection means by using a wireless connection means using a radio. As a result, the problem of high-voltage induced power, which is a problem when using a wired connection means such as a cable, can be solved, and the cable laying cost can be eliminated. Therefore, the safety improvement and cost reduction of the control / monitoring system of the transformer 1201 can be achieved. effective.

The effects of the examples described above will be summarized. Currently the mainstream radios generate carrier frequencies with a PLL that uses both digital signal processing and analog signal processing. Since the PLL determines the generation frequency by a feedback loop, the convergence time of the loop varies depending on the characteristics of the PLL device and the environment (temperature, humidity, vibration, etc.) in which the PLL device is placed. Since the signal generated by the PLL device is a sine wave and has periodicity, it is considered that the convergence times, which are different, are randomly distributed within the period. Therefore, multiple activations for different PLLs in each system are performed. If the process of stopping and restarting is repeated, it is considered that the phases of the sine wave or the cosine wave generated by both PLLs match within the range of the appropriate allowable phase error in the process. By using the above operation process, the phases of the two carriers can be practically matched, and in the frequency of polarization rotation and the frequency of the information signal, which are other frequency bands used in communication using rotational polarization. Polarization control can be realized with a commercial digital signal processing device.

1… Information signal generator
2… Synchronous measurement signal generator
3… Information signal switch
4… High frequency signal measuring instrument
5 ... Analog-to-digital converter
6 ... Digital signal bus
7… Second information signal switch
8 ... Synchronous signal generation circuit
9 ... Signal processing circuit
11… Rotating polarized cosine wave generator
12… Rotating polarization sine wave generator
13… First weight constant generator
14… Second weight constant generator
15 ... First waveform signal switcher
16 ... Second waveform signal switch
17… First multiplier
18 ... Second multiplier
19 ... Digital circuit block
21 ... Third multiplier
22 ... Fourth multiplier
101, 102, 103, 104, 105, 106, 107, 108, 109, 110 ... Rotating polarized radio

Claims (15)

A radio system that uses two radio waves whose polarization rotates at a frequency independent of the carrier frequency and communicates when the deviations between the two carrier phases and the polarization rotation phases are within the permissible values. Control method. The method for controlling a wireless system according to claim 1.
A control method for a wireless system, characterized in that a procedure for keeping the phase of polarization rotation within a permissible value is performed after a procedure for keeping the phase of two carriers within a permissible value. The method for controlling a wireless system according to claim 2.
A method for controlling a wireless system, which comprises performing a procedure for making the phases of polarization rotation orthogonal after the procedure for making the phases of the carrier waves in-phase. The method for controlling a wireless system according to claim 1.
A control method for a wireless system, characterized in that after synthesizing two carriers, the synthesis result is measured, and the phase relationship between the two carriers is controlled using the measurement result. The method for controlling a wireless system according to claim 1.
A control method for a wireless system, characterized in that two carriers are generated by different PLL circuits. The method for controlling a wireless system according to claim 5.
A control method for a wireless system, characterized in that after synthesizing two carriers, the synthesis result is measured, and the two PLLs are repeatedly restarted until the measurement result satisfies a predetermined condition. The method for controlling a wireless system according to claim 2.
The initial phases of the sine wave and cosine wave that control the polarization rotation are variable,
After the result of combining the outputs of the two carriers is larger than the predetermined value, the initial phases of the sine wave and the cosine wave are changed, and the result of combining the outputs of the two carriers after superimposition is smaller than the predetermined value. A method of controlling a wireless system, which comprises performing such a procedure. The method for controlling a wireless system according to claim 1.
In order to use the two radio waves, the first signal path and the second signal path are used.
A first carrier wave and a second carrier wave are used as the two carrier waves.
In order to rotate the polarization, a first rotationally polarized signal and a second rotationally polarized signal are used.
In the first signal path, the first carrier wave is supplied by the first PLL circuit, and the first carrier wave is supplied by the first PLL circuit.
In the second signal path, the second carrier wave is supplied by the second PLL circuit, and the second carrier wave is supplied by the second PLL circuit.
In the first signal path, the first rotationally polarized signal and the first known signal are selectively supplied.
In the second signal path, the second rotationally polarized signal and the second known signal are selectively supplied.
An information signal and a third known signal are selectively supplied to the first signal path and the second signal path.
When evaluating whether the phase deviation of the two carriers is within the allowable value,
The third known signal is supplied to the first signal path and the second signal path.
The first carrier wave and the first known signal are supplied to the first signal path.
The second carrier wave and the second known signal are supplied to the second signal path.
A method for controlling a wireless system, which determines whether or not a signal of the first signal path and a signal of the second signal path are in phase. The method for controlling a wireless system according to claim 8.
Based on the waveform of the signal obtained by combining the signal of the first signal path and the signal of the second signal path, it is determined whether the signal of the first signal path and the signal of the second signal path are in phase. A method of controlling a wireless system, characterized in that it does. The method for controlling a wireless system according to claim 9.
If the phase deviation of the two carriers is within the permissible value, then
The third known signal is supplied to the first signal path and the second signal path.
The first carrier wave and the first rotationally polarized signal are supplied to the first signal path.
The second carrier wave and the second rotationally polarized signal are supplied to the second signal path.
Based on the waveform of the signal obtained by synthesizing the signal of the first signal path and the signal of the second signal path, it is determined whether the signal of the first signal path and the signal of the second signal path are orthogonal to each other. A method of controlling a wireless system, characterized in that it does. The method for controlling a wireless system according to claim 10.
When determining whether the signal of the first signal path and the signal of the second signal path are in phase, the first PLL circuit and the second PLL circuit are restarted a plurality of times. A characteristic wireless system control method. An information signal generator that generates an information signal and
A first signal path and a second signal path that branch the information signal into two systems,
A rotating polarized sine wave generator that generates a sine wave,
A rotating polarized sine wave generator that produces a sine wave,
In the first signal path, a first multiplier that synthesizes the cosine wave with a signal flowing through the first signal path, and
In the second signal path, a second multiplier that synthesizes the sine wave with the signal flowing through the second signal path, and
A first PLL circuit that generates a first carrier and
A second PLL circuit that generates a second carrier and
In the first signal path, a third multiplier that synthesizes the first carrier wave with a signal flowing through the first signal path, and
In the second signal path, a fourth multiplier that synthesizes the second carrier wave with the signal flowing through the second signal path, and
A first antenna that radiates a signal from the first signal path into space as a radio wave, and
A second antenna that radiates a signal from the second signal path into space as a radio wave, and
A signal processing circuit that repeatedly restarts the first PLL circuit and the second PLL circuit a plurality of times during a predetermined training period.
Radio equipped with. The radio according to claim 12,
Synchronous measurement signal generator to generate training signal and
An information signal switch that switches between the output of the synchronous measurement signal generator and the output of the information signal generator.
The first weight constant generator that generates the first weight constant, and
The second weight constant generator that generates the weight constant of subject 2, the first waveform signal switch that switches the output of the rotationally polarized cosine wave generator and the output of the first weight constant generator,
A second waveform signal switch that switches between the output of the rotationally polarized sine wave generator and the output of the second weight constant generator.
The signal processing circuit is used during the training period.
Select the training signal with the information signal switch and select
The first weight constant is selected by the first waveform signal switch, and the first weight constant is selected.
Select the second weight constant with the second waveform signal switch,
The restart of the first PLL circuit and the second PLL circuit is repeated until the phases of the first carrier wave and the second carrier wave satisfy a predetermined condition.
The radio is characterized in that it is determined that the predetermined condition is satisfied because the amplitude of the signal obtained by combining the output of the first signal path and the output of the second signal path exceeds a predetermined threshold value. The radio according to claim 13.
The signal processing circuit
After the phases of the first carrier wave and the second carrier wave satisfy a predetermined condition,
Select the training signal with the information signal switch and select
Select the cosine wave with the first waveform signal switch,
Select the sine wave with the second waveform signal switch and select
It is characterized in that it is determined whether or not the amplitude of the signal obtained by combining the first carrier wave and the cosine wave and the signal obtained by combining the second carrier wave and the sine wave is below a predetermined threshold value. wireless device. A wireless system using the wireless device according to claim 12.
A wireless system that communicates using two radio waves whose polarization rotates at a frequency independent of the carrier frequency.

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