JP6963447B2 - Wireless transmission device and transmission method - Google Patents

Description

The present invention relates to a wireless transmission device and a transmission method, and relates to, for example, a wireless transmission device and a communication method of a method of switching and transmitting an active system and a backup system in a digital STL / TTL device.

As a wireless transmission technology for transmitting a terrestrial digital broadcast program from a performance station to each broadcasting station, there is an STL (Studio To Transmitter) device that relays and transmits using radio waves in the microwave band.

If such a transmission device stops for some reason, it will lead to an immediate broadcast accident and have a great impact. For this reason, the transmission device used for broadcasting applications generally has a redundant configuration by duplication in order to improve reliability. That is, the operation of switching the system duplicated by the first system (also referred to as "No. 1 system") and the second system (also referred to as "No. 2 system") between the active system and the backup system is performed. ing.

In the duplicated transmission device, various techniques for appropriately switching the duplicated system have been proposed (see, for example, Patent Documents 1 and 2). For example, in the technique disclosed in Patent Document 1, when the transmission is switched, the phase of the received signal changes on the receiving device side, but the phase tracking function of the demodulator processes the reception so that the reception does not break. In the technique disclosed in Patent Document 2, the frequency deviation of the local high-frequency oscillator is detected, an alarm is issued, and the active system and the backup system are switched without adding the local high-frequency oscillator for detection.

FIG. 7 is an example of a system configuration diagram of a conventional dual digital wireless transmission device 200 (digital STL device). The STL transmitter 201 includes a first system including a digital modulator (# 1) 205a and a transmission converter (# 1) 206a, a digital modulator (# 2) 205b, and a transmission converter (# 2) 209b. It is duplicated by the second system.

On the other hand, the receiving device 216 is composed of the first system including the receiving converter (# 1) 220a and the digital demodulator (# 1) 223a, and the receiving converter (# 2) 220b and the digital demodulator (# 2) 223b. The second system is duplicated by.

The TS signal, CLK signal, and Fsync signal input to the transmitter 201 are input to the digital modulator (# 1) 205a and the digital modulator (# 2) 205b, respectively, and digital modulation such as 64QAM (Quadrature Amplitude Modulation) is performed. It is applied and output as an IF signal.

Further, the transmission converter (# 1) 206a and the transmission converter (# 2) 206b each up-convert the input IF signal to the SHF band, further amplify the power, and switch the SHF as an SHF (Super High Freaquency) signal. Output to the device 224 respectively.

The SHF switch 224 to which the SHF signal is input transmits the SHF signal from the transmission converter (# 1) 206a and the SHF signal from the transmission converter (# 2) 206b according to the system selection signal from the SHF transmission switch 224. Switch output. The output signal from the SHF switch 224 is output to the aerial line via the transmitting antenna 215 as a working system signal.

In the STL receiving device 216, the SHF distributor 218 distributes the radio wave from the STL transmitting device 201 received by the receiving antenna 217 into two, and distributes the radio wave to the receiving converter (# 1) 220a and the receiving converter (# 2) 220b. ..

The reception converter (# 1) 220a and the reception converter (# 2) 220b each power-amplify the input SHF signal, then down-convert it to an IF signal and output it. The digital demodulator (# 1) 223a and the digital demodulator (# 2) 223b each digitally demodulate the IF signal to reproduce and output the TS signal, CLK signal, and Fsync signal.

On the other hand, the TS switching distributor 225 selects and distributes and outputs the signals from the digital demodulator (# 1) 223a and the digital demodulator (# 2) 223b based on the system selection signal from the reception monitoring plate 222.

By the way, in such a wireless transmission device, in addition to the main line data such as a broadcast signal, a preamble period for a waveform equalization reference signal is inserted into the transmission signal at regular intervals. When switching the transmission data of the first system (No. 1 system) and the second system (No. 2 system) in the above-mentioned transmission device 201, it is generally performed during the preamble period so that the main line data is not lost due to the switching. Is.

In order to perform switching in this preamble period, it is necessary to match the preamble periods between the transmission signals between the transmission systems. Therefore, in the configuration of FIG. 6, the preamble period is matched by exchanging the synchronization signal between the digital modulator (# 1) 205a and the digital modulator (# 2) 205b, and the digital modulator is also used. By passing the preamble period information from (# 1) 205a and the digital modulator (# 2) 205b to the transmission monitoring plate 209, when switching between the first system and the second system of transmission, the switching timing is set to the preamble period. It becomes possible to manage so that it can be done.

Generally, in a digital demodulator (digital demodulator (# 1) 223a, digital demodulator (# 2) 223b), the IF signal from the reception converter is subjected to AGC (Auto Gain Control) to obtain a desired value for the gain with respect to the input level. Is automatically adjusted, and then down-converted to a predetermined value to perform frequency conversion. The frequency-converted signal is digitized by A / D conversion processing, and the signal further performs phase control of the digital signal input by the phase device, phase error detection, and filter. After that, as a digital demodulation process, a demapping process is performed on the phase-adjusted signal.

Japanese Unexamined Patent Publication No. 2002-359578 Japanese Unexamined Patent Publication No. 2008-193532

By the way, each unit constituting this conventional STL device is mounted in the same rack, and each unit is often connected by a coaxial cable or a noise-resistant twisted pair control cable. Further, as an operation mode of the STL device, once the operation is started, the power is generally kept on and the power is not turned off. Therefore, if maintenance is required for the transmission monitoring board for some reason, the 10MHz CLK signal, which is a synchronization signal, is supplied from the transmission monitoring board, so the power to the transmission monitoring board is cut off, etc. If this is done, the supply of the 10 MHz CLK signal to the transmission converter is interrupted, and there is a problem that the transmission output is stopped. In order to avoid this, it was common to perform maintenance work or the like during the broadcast suspension time, which is a time zone in which the power of the STL device can be turned off.

As described above, in the conventional STL device, the transmission conversion of the 10 MHz CLK signal, which is the reference of the transmission frequency of the STL device, from the transmission monitoring plate to the first system (No. 1 system) and the second system (No. 2 system). Since it is supplied to the vessel, there are problems such as time constraints in performing maintenance of the transmission monitoring plate. From another point of view, if a problem occurs in the reference clock in the transmission monitoring plate, there is a problem that both the transmission converters of the No. 1 system and the No. 2 system are affected.

The present invention has been made in view of such a situation, and an object of the present invention is to solve the above problems.

The present invention is a wireless transmission device including a transmission device including a first transmission system and a second transmission system, and the transmission system is switched between an active system and a backup system for operation. The transmission system and the second transmission system are each provided with a voltage-controlled oscillator whose oscillation frequency is controlled by a set voltage, and the transmission system selected as the active system is the transmission selected as the backup system. when transmitting a signal of its own of the oscillator with respect to system, the transmission system of the standby system performs alignment processing for the signal of the oscillator of the transmission system of the current system, where the is switched active and standby systems transmission lines has shifted to a new active system is pre-migration from the state which has been incorporated fit of the signal the oscillator of the active system, its in free-running on the basis of the output of the oscillator itself the oscillator early in After shifting to the set voltage , the most recently maintained side of the first transmission system and the second transmission system is set to be the active system, and the other side is set to be the standby system .
The transmission lines shifted to the new active system, at the time of transition to the initial of the set voltage, the upper limit on the rate of change of the set voltage may be set.
The present invention is a transmission method of a wireless transmission device including a first transmission system and a second transmission system, and the transmission system is switched between an active system and a backup system for operation. The transmission system and the second transmission system each include a voltage-controlled oscillator whose oscillation frequency is controlled by a set voltage, from the transmission system of the active system to the transmission system of the standby system. switching the oscillation frequency notifying step of transmitting the signal of the oscillator transmission system on a step narrowing combined transmission system of the standby system performs alignment processing for the signal of the oscillator of the active system, the active system and standby system when obtained, the transmission system which has shifted to a new active system, the pre-migration from the state which has been incorporated fit of the signal the oscillator of the active system, its at the basis of the output of the oscillator free-running of the apparatus a migration step moves to the initial of the set voltage of the oscillator, and having a first transmission line, out of the second transmission system, most recently in the maintenance the side is the active system, and the other side standby system Set to be .

According to the present invention, in a dual wireless transmission device, even when a deviation occurs in the reference frequency between systems, appropriate frequency fluctuation adjustment is performed at the time of switching, and a technique of suppressing switching shock can be realized. ..

It is a block diagram which shows the schematic structure of the digital wireless transmission apparatus which concerns on embodiment. It is a block diagram which shows an example of the synchronization system in the transmission converter which concerns on embodiment. It is a figure explaining the transmission frequency control at the time of switching of a transmission converter (# 1) and transmission converter (# 2) which concerns on embodiment. It is a figure which shows the state of the control voltage of VCXO at the time of transmission switching when there is no frequency deviation of transmission converter (# 1) and transmission converter (# 2) which concerns on embodiment. It is a figure which shows the control voltage of VCXO of the transmission converter (# 1) at the time of master / slave switching when the frequency deviation occurs in the oscillation frequency which concerns on embodiment. It is a figure which shows the control voltage of VCXO of the transmission converter (# 2) at the time of master / slave switching when the oscillation frequency has a deviation which concerns on embodiment. It is a block diagram which shows the schematic structure of the digital wireless transmission apparatus which concerns on the background technology.

Next, an embodiment for carrying out the present invention (hereinafter, simply referred to as “embodiment”) will be specifically described with reference to the drawings. The outline of this embodiment is as follows. The reference clock processing of the transmission converter is to send and receive the 10MHz reference clock between the devices of the active system and the standby system, and by building a master / slave relationship, the STL system can be operated depending on the presence or absence of the transmission monitoring board. Realize the construction of a system that does not affect. Further, even if a frequency deviation occurs between the active system and the standby system due to a frequency deviation such as aged deterioration of the voltage controlled crystal oscillator (VCXO), it has an appropriate frequency fluctuation adjustment at the time of switching.

FIG. 1 is a block diagram showing a schematic configuration of a digital wireless transmission device 100 according to the present embodiment, and is a so-called STL device. The digital wireless transmission device 100 includes a transmission device 1 and a reception device 16.

The transmission device 1 includes a digital modulator (# 1) 5a, a digital modulator (# 2) 5b, a transmission converter (# 1) 6a, a transmission converter (# 2) 6b, an SHF switch 24, and a transmission monitoring plate 9. And a transmitting antenna 15. When the digital modulator (# 1) 5a and the digital modulator (# 2) 5b are not distinguished, they are simply referred to as "digital modulator 5". When the transmission converter (# 1) 6a and the transmission converter (# 2) 6b are not distinguished, they are simply referred to as "transmission converter 6".

The receiving device 16 includes a receiving antenna 17, an SHF distributor 18, a receiving converter (# 1) 20a, a receiving converter (# 2) 20b, a digital demodulator (# 1) 23a, and a digital demodulator (# 2) 23b. A reception monitoring viewing plate 22 and a TS switching distributor 25 are provided. When the reception converter (# 1) 20a and the reception converter (# 2) 20b are not distinguished, they are simply referred to as "reception converter 20". When the digital demodulator (# 1) 23a and the digital demodulator (# 2) 23b are not distinguished, they are simply referred to as "digital modulator 23".

The transmission device 1 has a redundant configuration by duplication. That is, the transmission device 1 includes a first system (No. 1 system) composed of a digital modulator (# 1) 5a and a transmission converter (# 1) 6a, a digital modulator (# 2) 5b, and a transmission converter (transmission converter 1). # 2) Duplication is achieved with the second system (No. 2 system) consisting of 6b. The transmission monitoring plate 9 acquires an alarm (AL) from another component of the transmission device 1 and monitors each process.

On the other hand, the receiving device 16 includes a first system (No. 1 system) including a receiving converter (# 1) 20a and a digital demodulator (# 1) 23a, a receiving converter (# 2) 20b, and a digital demodulator (# 1). # 2) Duplication is achieved with the second system (No. 2 system) consisting of 23b. Similar to the transmission monitoring plate 9, the reception monitoring viewing plate 22 acquires an alarm (AL) from other components of the receiving device 16 and monitors each process.

Here, the basic operation of each unit of the transmission device 1 will be described.
The TS signal, CLK signal, and Fsync signal input to the transmitter 1 are input to the digital modulator (# 1) 5a and the digital modulator (# 2) 5b, respectively, are subjected to digital modulation such as 64QAM, and are IF signals. It is output as 8a and 8b.

Further, the transmission converter (# 1) 6a and the transmission converter (# 2) 6b up-convert the input IF signals 8a and 8b into the SHF band, further amplify the power, and use the SHF signals 11a and 11b as SHF signals. Output to the switch 24 respectively.

The SHF switch 24 to which the SHF signals 11a and 11b are input transmits the SHF signal 11a from the transmission converter (# 1) 6a and the SHF signal 11b from the transmission converter (# 2) 6b from the transmission monitoring plate 9. Switching output is performed according to the selection signal Pa. The output signal from the SHF switch 24 is output to the aerial line via the transmitting antenna 15 as a working system signal.

Further, in the receiving device 16, the SHF distributor 18 distributes the radio wave from the transmitting device 1 received by the receiving antenna 17 to the receiving converter (# 1) 20a and the receiving converter (# 2) 20b. ..

The reception converter (# 1) 20a and the reception converter (# 2) 20b power-amplify the input SHF signals 19a and 19b, respectively, and then down-convert them to IF signals 21a and 21b for output.

The digital demodulator (# 1) 23a and the digital demodulator (# 2) 23b digitally demodulate the IF signals 21a and 21b, respectively, and reproduce and output the TS signal, CLK signal, and Fsync signal.

On the other hand, the TS switching distributor 25 selects and distributes and outputs the signals from the digital demodulator (# 1) 23a and the digital demodulator (# 2) 23b based on the selection signal Pb from the reception monitoring plate 22.

Since the present embodiment is characterized by the transmitting device 1 and the receiving device 16 can be realized by a general configuration and operation, the transmission device 1 will be mainly described below. FIG. 2 is a block diagram of the transmission converter 6 (transmission converter (# 1) 6a, transmission converter (# 2) 6b). The internal operation of the transmission converter 6 will be described with reference to FIG.

The IF signal 8 from the digital modulator 23 is limited to the band required by the filter 26, and is converted into a transmission frequency by the mixer 39 by multiplying the local signal RF consisting of a sine wave from the local oscillator 40. The power is amplified by the power amplifier 41 and output as a transmission signal (SHF signal 11).

For example, when the transmission frequency is 7000 MHz and the IF signal is 130 MHz, the frequency of the local signal is 7000-130 = 6870 MHz. The local oscillator 40 is a circuit that frequency-converts a 10 MHz reference clock input from the VCXO32 (10MVCXO) into a desired local signal.

The voltage comparator 35 compares the input voltage of the A / D 33 with the output voltage value of the D / A 36 in preparation for switching to the master at the time of slave, and outputs the comparison result to the CPU 34. The CPU 34 controls the D / A 36 so that the potentials are the same while referring to the comparison result.

As described above, the frequency accuracy of the local oscillator 40 depends on the accuracy of the 10 MHz reference clock (VCXO32). Therefore, the frequency management of this 10 MHz reference clock is very important.

FIG. 3 illustrates transmission frequency control when switching between the transmission converter (# 1) 6a and the transmission converter (# 2) 6b in the STL system (digital wireless transmission device 100) having a redundant configuration by duplication. It is a figure to do. Here, the configuration mainly related to the transmission frequency control from the configuration of FIG. 2 is described.

As described above, one of the transmission converter (# 1) 6a and the transmission converter (# 2) 6b has a working system (master) and the other has a backup system (slave).

The master-selected transmission converter 6 operates on its own reference signal (here, a 10 MHz reference clock). The transmission converter 6 on the slave side executes a matching step that operates in accordance with the reference signal received from the master side.

In the transmission converter 6 of the working system (here, the transmission converter (# 1) 6a), the CPU 34 selects the changeover switch 31 on the master (M) side. The control voltage that becomes the oscillation frequency of the VCXO32 is realized by supplying the analog voltage that is converted from the digital signal to the analog signal by the D / A converter 36 to the VCXO32 as the control voltage. NS. This control voltage at the time of mastering becomes a constant value.

The VCXO32 is a crystal oscillator whose oscillation frequency can be changed according to the input control voltage. In this VCXO32, the oscillation frequency f changes in proportion to the control voltage V. Normally, the frequency can be varied around a voltage that is half the power supply voltage (2.5 V in the case of a 5 V power supply voltage).

Further, the backup transmission converter 6 (here, transmission converter (# 2) 6b) operates with reference to the 10 MHz reference clock supplied from the active system side. For the changeover switch 31, the slave (S) side is selected, a PLL composed of the phase comparator 29, the loop filter 30, and the VCXO 32 is configured, and 10 MHz from the active side (here, the transmission converter (# 1) 6a). By synchronizing with the reference clock, the transmission converter (# 1) 6a of the active system and the transmission converter (# 2) 6b of the backup system always operate with the same frequency.

Next, the operation when the transmitters of the active system and the standby system are switched will be described.
Switching between the active system and the standby system, that is, switching between the master and slave, is as follows: (1) A method in which the transmission monitoring board 9 automatically switches from an abnormal system to a normal system based on the monitoring information input from each device. , (2) Maintenance There is a method of manually switching between the first system and the second system during maintenance. In either method, switching control is performed by outputting a switching signal from the transmission monitoring plate 9 to the SHF switch 24.

When the first system (transmission converter (# 1) 6a) is the master (M) and the second system (transmission converter (# 2) 6b) is the slave (S), the transmission device 1 of FIG. The changeover switch 31 of the transmission converter (# 1) 6a selects the master (M) side under the control of the CPU 34.

At that time, the control voltage of the VCXO32 outputs a control voltage value via the D / A 36 so as to have a frequency f1 (a set frequency at the time of mastering of the transmission converter (# 1) 6a) under the control of the CPU 31.

On the other hand, in the transmission converter (# 2) 6b, the changeover switch 31 selects the slave (S) side, and the PLL including the phase comparator 29, the loop filter 30, and the VCXO32 is used to Ref_Out of the transmission converter (# 1) 6a. The PLL is applied so as to be the 10 MHz reference clock f1 output from.

At this time, the transmission converter 6 on the slave (S) side (here, the transmission converter (# 2) 6b) stores the control voltage of the VCXO 32 in the CPU 34. The control voltage of the VCXO32 is converted into a digital signal by the A / D 33, input to the CPU 34, and stored.

Next, the operation when the second system (transmission converter (# 2) 6b) is switched to the master and the first system (transmission converter (# 1) 6a) is switched to the slave will be described.

The changeover switch 31 of the transmission converter (# 2) 6b switches from the slave terminal (S) side to the master terminal (M) side. At this time, a control voltage is applied to the VCXO32 so that the transmission converter (# 1) 6a, which is the first system, has a frequency f2 from the CPU 34 via the D / A 36, as in the case of the master system.

Further, the switch 31 of the transmission converter (# 1) 6a switches from the master terminal (M) side to the slave terminal (S) side, and is output from Ref_Out of the transmission converter (# 2) 6b which is the second system. PLL control is applied so as to match the 10 MHz reference clock.

By the way, basically, the control voltage of the VCXO32 is set in advance so that the transmission frequencies of the first system and the second system are the same (that is, f1 = f2). Generally, in a crystal oscillator such as VCXO32, the oscillation frequency may fluctuate slightly due to aged deterioration or the like. For example, when the frequency fluctuation of the VCXO32 of the transmission converter (# 2) 6b occurs, a frequency deviation occurs between the transmission converter (# 1) 6a and the transmission converter (# 2) 6b. As a result, when the transmission is switched as described above, the phase fluctuation becomes large, so that the phase control at the time of switching cannot be normally performed in the demodulation unit (digital modulator) of the receiving device 16, and the reception fails. May cause. Therefore, it is necessary to control the control voltage of the VCXO32 so that it does not suddenly change at the time of switching.

With reference to FIGS. 4 to 6, the transition of the control voltage set value of the VCXO32 when the master / slave switching operation occurs will be described. Switching 1 (T1) switches the transmission converter (# 1) 6a from the master to the slave and the transmission converter (# 2) 6b from the slave to the master. In switching 2 (T2), the transmission converter (# 1) 6a is switched from the slave to the master, and the transmission converter (# 2) 6b is switched from the master to the slave.

FIG. 4 shows the control voltage of the VCXO32 at the time of transmission switching when there is no frequency deviation between the transmission converter (# 1) 6a which is the first system and the transmission converter (# 2) 6b which is the second system. Show the situation. Since there is no frequency deviation, both the transmission converter (# 1) 6a and the transmission converter (# 2) 6b behave in the same manner.

Since there is no frequency deviation, the potential difference between the master terminal (M) side and the slave terminal (S) side of the changeover switch 31 is almost constant even during the crystal voltage transition period applied to the conventional configuration. There is no switching shock at any of the timings of switching 2 and switching 2, and as a result, the phase fluctuation when received by the receiving device 16 does not occur so much.

FIG. 5 shows the control voltage of the VCXO32 of the transmission converter (# 1) 6a at the time of master / slave switching when a frequency deviation occurs in the oscillation frequency. FIG. 6 shows the control voltage of the VCXO32 of the transmission converter (# 2) 6b at the time of master / slave switching when the oscillation frequency has a deviation.

As described above, the oscillation frequency f1 of the transmission converter (# 1) 6a, which is the first system, and the oscillation frequency of the transmission converter (# 2) 6b, which is the second system, due to the aged deterioration of the VCXO32 and the like. When a deviation occurs in f2, the potential difference between the master terminal (M) side and the slave terminal (S) side of the changeover switch 31 becomes large. Therefore, at the time of switching, the following control is performed so that the phase fluctuation in the receiving device 16 does not become large.

The explanation will focus on the operation of switching from the slave to the master. In FIG. 3, the transmission converter (# 2) 6b is subjected to a PLL so as to synchronize with the 10 MHz reference clock of the transmission converter (# 1) 6a which is the first system.

The master terminal (M) of the changeover switch 31 is set in advance to the same voltage value (voltage value under PLL control) as the control voltage on the slave terminal (S) side. That is, the voltage value V (f1 + Δf) stored in the CPU 34 via the A / D 33 is applied to the master terminal (M) via the D / A 36 (0 to T1 period).

Next, when switching from the spare system (that is, the slave) to the active system (that is, the master), the changeover switch 31 switches from the slave terminal (S) side to the master terminal (M) side.

As described above, the master terminal (M) of the changeover switch 31 has the same voltage as the slave terminal (S) side, so that the control voltage supplied to the VCXO 32 by switching causes only a slight changeover shock.

Next, in the control voltage transition period (T1 to Tx), which is the transition step, the voltage is gradually changed to the set voltage Vf2 at the time of mastering of the transmission converter (# 2) 6b set in advance. The slope of this transition time depends on the phase tracking performance of the receiving device 16. However, if the phase tracking performance is too high and the amount of change is large, a switching shock may occur. Therefore, for example, an upper limit may be set for the amount of change (that is, the rate of change) for a certain period. The transmission converter 6 of the operation system switched from the backup system shifts the change up to the initial set voltage (Ref voltage) in a predetermined voltage step. As a result, in the transition step, a sudden frequency change occurs, and the adverse effect on the digital wireless transmission device 100 can be further eliminated.

Further, when the transmission converter (# 2) 6b changes from the master to the slave again (for example, switching 2 (T2)), the control voltage of the PLL loop is immediately set. As the CPU internal processing, the PLL control voltage and the CPU control voltage are compared by the voltage comparator 35 at the time of slave, the CPU control voltage is controlled, and they are always matched (followed). The transition time at this time depends on the response speed of the PLL loop filter 30.

By doing the above, even if there is a frequency deviation between the transmission converter (# 1) 6a and the transmission converter (# 2) 6b, those two systems are used when switching the transmission between the active system and the backup system. Since the frequencies of the above can be adjusted, the receiving device 16 is not given a switching shock. That is, it is possible to prevent breakage during switching due to frequency deviation, and to realize a digital wireless transmission device 100 (STL system) that does not depend on the presence or absence of a transmission monitoring plate 9 or the like.

By the way, the system on the newly switched side may be considered to be more reliable than the transmission converter 6 that has been in operation for a long period of time. For example, when the operation becomes abnormal and switching occurs, if the frequency of the system in which the operation becomes abnormal is followed, there remains a concern that an adverse effect may occur. Therefore, even if the transmission monitoring plate 9 controls the system selection signal Pa so that when an operation abnormality (for example, notification of an alarm (AL)) occurs, the system in which the operation abnormality does not occur becomes the operating system. good.

In some cases, it is more reliable to take the initiative when the maintained system shifts to operation after performing maintenance on a system that is not in operation. That is, since it operates at the frequency of the latest maintenance device, it can be basically judged to be the closest to the desired frequency. Therefore, the transmission monitoring plate 9 may control the system selection signal Pa so that the maintained system preferentially becomes the operating system.

The present invention has been described above based on the embodiments. This embodiment is an example, and it will be understood by those skilled in the art that various modifications are possible for the combination of each of these components, and that such modifications are also within the scope of the present invention.

1 Transmitter 5a Digital modulator (# 1)
5b Digital Modulator (# 2)
6 Transmission converter 6a Transmission converter (# 1)
6b transmission converter (# 2)
8, 8a, 8b, 21a, 21b IF signal 9 Transmission monitoring plate 11, 11a, 11b, 19a, 19b SHF signal 15 Transmission antenna 16 Receiver 17 Reception antenna 20a Reception converter (# 1)
20b reception converter (# 2)
22 Reception monitoring viewing plate 23a Digital demodulator (# 1)
23b Digital demodulator (# 2)
24 SHF switch 25 TS changeover distributor 26 Filter 29 Phase comparator 30 Loop filter 31 Changeover switch 32 VCXO
33 A / D
34 CPU
35 Voltage Comparator 36 D / A
39 Mixer 40 Local oscillator 41 Power amplifier 100 Digital wireless transmission device RF Local signal

Claims (3)

It is a wireless transmission device that has a transmission device including a first transmission system and a second transmission system, and operates by switching those transmission systems between an active system and a backup system.
The first transmission system and the second transmission system each include a voltage-controlled oscillator whose oscillation frequency is controlled by a set voltage .
The transmission system selected as the active system transmits the signal of its own oscillator to the transmission system selected as the backup system.
Transmission system of the standby system performs alignment processing for the signal of the oscillator of the transmission system of the working system,
If the active system and the standby system is switched, the transmission system was shifted to a new active system, from the state they were incorporated fit signal of the oscillator before migration working system, the output of the oscillator itself based moves to the initial of the set voltage of the oscillator itself in self-propelled,
A wireless transmission device characterized in that, of the first transmission system and the second transmission system, the most recently maintained side is the active system and the other side is the standby system. The newly migrated transmission system to the working system, when the transition to the initial of the set voltage, the radio transmission apparatus according to claim 1, characterized in that the upper limit to the rate of change of the setting voltage is set .. It is a transmission method of a wireless transmission device provided with a first transmission system and a second transmission system, and the transmission systems are switched between an active system and a backup system for operation.
The first transmission system and the second transmission system each include a voltage-controlled oscillator whose oscillation frequency is controlled by a set voltage .
An oscillation frequency notification step of transmitting the signal of the oscillator of the active system transmission system from the active system transmission system to the backup system transmission system, and
A step narrowing combined transmission system of the standby system performs alignment processing for the signal of the oscillator of the active system,
If the active system and the standby system is switched, newly in migrated transmission system to the working system, the state has been incorporated fit into a signal of the oscillator from before entering the working system, the output of the oscillator of the device itself a migration step moves to the initial of the set voltage of its own of the oscillator at based on self-propelled,
And having a,
A transmission method characterized in that, of the first transmission system and the second transmission system, the most recently maintained side is the active system and the other side is the backup system.

Images