JPH03258127A - System for monitoring standby system - Google Patents

Abstract

PURPOSE:To check the transmission quality of a standby system transmitter in operation by forming a transmission/reception loop with a standby system transmitter-receiver. CONSTITUTION:An input test signal via a hybrid 11 is used to generate the modulation wave of an intermediate frequency band by a modulation section 12, the signal is amplified and fed to a transmission mixer 134, which receives the output of a transmission local oscillator 43 via a hybrid 42 and the result is frequency-converted into a transmission signal. The signal is reflected totally by a high frequency switch SW 311 via a band pass filter 133, an amplifier 132 and circulators CR 131, 312, inputted to a 2nd receiver via the CR 312, the SW 313, an attenuator 322 and a hybrid 321 and fed to a receiver side mixer 243 via the CR 241 and an amplifier 242. Since the output of a transmission local oscillator 41 is fed via a switch 44, the signal is converted into the signal of an intermediate frequency band, demodulated at a demodulation section 23 via an amplifier 245 and a test signal is extracted. Thus, the standby system transmitter is not isolated from the transmission system but the transmission quality is checked in operation.

Description

[Detailed Description of the Invention] [Summary] The present invention relates to a standby system monitoring method used to monitor the standby system of a hot standby transmitter/receiver, and allows the transmission quality of the standby transmitter to be checked during operation. For the purpose of this, when a switching control signal is input in a hot standby type transmitting/receiving device, a part of the transmitting station signal generated by the second transmitting device is used instead of the receiving station signal. Local oscillator switching means for supplying to the frequency converter in the second receiving device, and switching for branching and inputting the reflected transmission signals of the first and second transmitting devices using a reflection type for the high frequency switch. Transmission/reception coupling means having a branching/selecting section that selects a transmission signal from the second transmitting device based on a control signal, and a receiving coupling section that supplies the output of the branching/selecting section to the first and second receiving devices. and a control section that controls the operation of each necessary section, and when monitoring the functions of the backup transmitting device using the second receiving device, the control section controls the transmitting/receiving coupling means and the local switching means. A switching control signal is sent to the second receiving device so that the second receiving device can receive the transmitted signal from the second transmitting device as a normal received signal.

[Industrial Field of Application] The present invention relates to a standby system monitoring system used when monitoring the standby system of a hot standby type transmitter/receiver.

In the hot standby method, the active and standby transmitter/receivers are in operation, and on the transmitting side, the active transmitter sends out a transmission signal, and the standby transmitter is disconnected. On the other hand, the active and standby receivers receive the transmitted signal and extract the demodulated output from this signal, but only the demodulated output of the active receiver is extracted to the outside.

Second, since the separated standby transmitter does not have a receiving system, it is difficult to check its performance regarding transmission quality. Therefore, it is necessary to be able to check the transmission quality of the backup transmitter during operation.

[Prior Art] FIG. 7 is a block diagram of a conventional example, and FIG. 8 is a block diagram of another conventional example. The operation of the diagram will be described below assuming that the first transmitting/receiving device is the active system and the second transmitting/receiving device is the backup system.

First, the first spanned signal inputted to the hybrid 11 in FIG. 7 is divided into two and applied to the first and second transmitting devices.

A modulation section 12' of the first transmitter generates a modulated wave using a baseband signal and sends it to a transmission section 13'.

The transmission part 13° converts the input modulated wave to a predetermined transmission frequency,
Circulator 1 converts it into predetermined power and sends it as a transmission signal.
4', a high frequency switch (hereinafter abbreviated as RF-5-) that selected the first transmitting device, and a band pass filter (hereinafter, abbreviated as RF-5-);
(abbreviated as BPF), and is transmitted to the antenna via the circulator 16.

Note that the second transmitter operates in the same way as the first transmitter, but since it is separated by RF-5IIJ, the transmitted output is totally reflected by RF-5W 15 and sent to circulator 1.
Consumed by the load connected to 4.

Next, the received signal that passes through the circulator 17 and BPF 26 and is divided into two by the hybrid 25 is the first . added to the second receiving device. In the first receiving device the receiving part 24
After the received signal is frequency-converted and amplified, it is demodulated by the demodulation section 23 and a baseband signal is obtained via the unipolar switch 22 and the unipolar/bipolar conversion section 21.

In addition, the second receiving device operates in a similar manner to obtain a bipolar signal, but the baseband signal of the first receiving device is extracted via a receiving switch (not shown) that selects the first receiving device. It will be done.

In FIG. 8, the IP-5W 15' is of the transfer type, and the first transmitter is selected as the active side and the second transmitter is selected as the backup side. Note that the operations of the transmitting device and receiving device are the same as described above.

[Problem to be solved by the invention]

As explained above, on the transmitting side, the output of the second transmitting device, which has been disconnected by RF-5- and has become a standby system, is consumed by the load, and on the receiving side, one of the receiving devices is selected by the receiving switch. Ru.

Here, if we take digital multiplex radio as an example, on the transmitting side the transmitter is selected and becomes the working system, and on the receiving side the first... Since both of the second receiving devices receive the same signal, it is possible to diagnose the devices in a line made up of these devices by checking the transmission quality by detecting parity bits or the like.

However, since the second transmitting device that has been separated and has become a standby system does not have a corresponding receiving device, it only monitors the transmission level and frequency, and other factors related to transmission quality.
For example, it is difficult to detect non-modulation due to modulator failure, deterioration of the frequency characteristics of the transmission system, increase in nonlinear distortion in the transmission part, etc.
It is difficult to take preventive measures.

That is, there is a problem in that the transmission quality of the second transmitter, which has been separated and has become a standby system, cannot be checked during operation.

[Means to solve problems] FIG. 1 shows a block diagram of the principle of the present invention.

In the figure, when a switching control signal is input, 4 supplies a part of the transmitting station oscillation signal generated by the second transmitting device to the frequency converter in the second receiving device instead of the receiving station oscillating signal. This is a local oscillator switching means.

In addition, 3 uses a reflection type cough high frequency switch to branch the reflected transmission signals of the first and second transmitting devices, and selects the transmitted signal from the second transmitting device by the input switching control signal. a transmitting/receiving coupling means having a branching/selecting part to perform the branching/selecting part, and a receiving coupling part for supplying the output of the branching/selecting part to the first and second receiving devices; 5 is a control part for controlling the operation of each necessary part; be.

Then, when monitoring the function of the second transmitting device using the second receiving device, the control section sends a switching control signal to the transmitting/receiving coupling means and the local oscillator switching means. To enable a receiving device to receive a transmitted signal from a second transmitting device as a normal received signal.

[Effect]

The present invention makes it possible to monitor the function of the second transmitting device by configuring a transmitting/receiving loop using the second transmitting/receiving device, which is a standby system, out of the first and second transmitting/receiving devices. For this purpose, a transmitting/receiving coupling means for inputting the output of the second transmitting device to the second receiving device and a local switching means for switching the receiving station signal to the transmitting station signal are provided.

First, when the transmission/reception coupling means uses the reflection type high frequency switch 311, the transmission side circulator 312 and the reception side hybrid 321, which are resistively terminated in the conventional example, are
The terminals of the transmitter circulator 312 and the receiver circulator 412 are connected via the high frequency switch 313 and the attenuator 415 (Fig. 1). (See Figure 2).

However, when using the transfer type high frequency switch 62, the high frequency switch 62 and the receiving side circulator 612 are connected through an attenuator 615 (see FIG. 3).

Further, the local switching means is composed of a hybrid 42 that distributes the transmitting station signal and a switch 44 that selects the receiving station signal and the transmitting station signal.

Now, the high frequency switch 3 is
The transmission signal from the first transmitting device selected as the active one by 11 is guided to the antenna, but the transmitting signal from the second transmitting device selected as the backup one is guided to the high frequency switch 31.
1, and is sent to the receiving side via the high frequency switch 313 operated in conjunction with the high frequency switch 311 and the attenuator 322.

On the receiving side, as shown in FIG. 1, the hybrid 321 distributes the transmission signal to the first and second receiving devices, and in FIG. It becomes the receiving input.

Here, the interval between the regular reception frequency F,l and the transmission frequency F for the first and second receiving devices is, for example, CCr
In the 6 GHz band recommended by RRec, 384, it is 340 MHz, which can be said to be a frequency sufficiently far from the band of each filter used (see Fig. 9).

Next, the local oscillator switching means 4 distributes the output of the transmitting local oscillator 41 through a hybrid 42, one of which is used as the input of the transmitter, and the other is connected to the local oscillator changeover switch 44. Since the output of the receiving local oscillator 43 is also input to this switch, any local oscillator signal can be selected by switching. For example, when you select the receiving station signal, the regular received signal is
When the transmitting station signal is selected, the transmitting signal from the second transmitting device is converted into an intermediate frequency band signal.

Now, the intermediate frequency is 70 MHz, the transmitting frequency is FT, the frequency of the transmitting station signal is FTL, the receiving frequency is FR1, the frequency of the receiving station signal is FIIL, and the relationship between the transmitting frequency, the receiving frequency, and the frequency of the local signal is F,・FTL+70
Assuming that MH2IFR=FRL+'7o MHz, FT and Fll are simultaneously input to the receiving device.

Here, if the reception station oscillation signal is selected as the reception side local oscillation signal, the intermediate frequency is Fi at the regular reception frequency FR.
l-FIIL becomes 70MHz, and the transmission frequency F,
Ftt-ht, +70MHz, and 340 + 70 in the above-mentioned 6G) Iz band frequency allocation.
MHz/410MHz becomes the intermediate frequency output.

On the other hand, when the local oscillator signal is the transmitting station oscillator signal, the frequency of the intermediate frequency signal obtained from the transmitting signal is 70M)I2, and the frequency of the intermediate frequency signal obtained from the normal reception signal is 410M).
MHz, and 70 MHz from the intermediate frequency band filter.
An intermediate frequency signal is output. In other words, the received signal can be switched by switching the local oscillator signal.

Further, the high frequency switch 313 operates to select the second transmitting device, and its electrical characteristics are determined by the high frequency switch 313.
It should be simpler than 11.

This is because the transmission signals from the first and second transmitting devices are selected by the high frequency switch 311, so one passes through and the other is totally reflected, making the D/U ratio at the input point of the high frequency switch 313 already 20 dB. There are differences in degree.

Therefore, the isolation of the high frequency switch 313 is generally about 15 to 20 dB, making it a simple switch of about one section.

Therefore, by configuring a combination of the transmitting/receiving coupling means 3 and the local switching means 4 for each of the first transmitting/receiving device and the second transmitting/receiving device, one can be used as the active system and the other as the backup system.
During operation, it becomes possible to monitor the transmission quality of the standby transmitter/receiver, and it is possible to check the transmission quality of the separated second transmitter.

〔Example〕

4 to 6 are block diagrams of embodiments of the present invention.

Here, the same reference numerals indicate the same objects throughout the figures. 4 corresponds to the transmitting/receiving coupling means shown in FIG. 2, FIG. 5 corresponds to FIG. 2, and FIG. 6 corresponds to FIG. ) is shown as a backup system, but the first transmitter/receiver (No., ITX, RX), which is a working system, also has the same configuration.

The operation shown in FIG. 4 will be explained below. It is assumed that the control section 5 sends out a control signal such that the operations of the switches 311, 313, and 44 are interlocked, and the state is shown by the solid line.

First, the modulation section 12 generates a modulated wave in an intermediate frequency band using the test signal inputted through the hybrid 11, amplifies it with the amplifier 135, and then applies it to the transmission mixer 134.

Here, 1. Since the output of the transmitting local oscillator 43 is applied via the hybrid 42, the frequency is converted into a modulated wave having a transmitting frequency, that is, a transmitting signal.

This transmission signal is passed through a bandpass filter 133. Amplifier 132
, RF-5W via circulator 13L 312
311 and is totally reflected by the circulator 312. RF-
5W 313° attenuator 322. The signal is input to the second receiving device via the hybrid 321.

Here, when the output of the transmitting device is PTdBTll and the input level of the receiving device is PRdBm, the value of the attenuator 322 of the transmitting/receiving coupling means is PT - PR - 3 (dB), for example, P is +30 dBm and PR is - If it is 30 dBm, the amount of attenuation of the attenuator 322 will be 57 dB. Here, -
3dB is the distribution loss in the hybrid.

Now, the input transmission signal is applied to the receiving mixer 243 via the circulator 241 and the amplifier 242. Since the output of the transmitting local oscillator 41 is applied here via the switch 44, it is converted into an intermediate frequency band signal, and then demodulated by the demodulation section 23 via the amplifier 245 to extract the test signal. As a result, the second transmitting device is not isolated from the transmission system, and its transmission quality can be monitored.

Next, in FIG. 5, the transmission signal from the second transmitting device is transferred to an attenuator, a circulator 412 . It is added to the second receiving device via a hybrid 413. Also, Figure 6 shows the RF-S
A transfer type RF-SW 62 is used as W, and the transmission signal from the second transmitter is transmitted through an attenuator 615.
Circulator 612. It is added to the second receiving device via a hybrid 613, but the other parts have the same configuration as in FIG.

Note that the embodiment of the present invention can also be used as a local callback test function. That is, as shown in FIG. 4, a test signal is applied to the modulation section of the second transmitting device, and the test signal is output from the demodulating section of the second receiving device via the pseudo line by the transmitting/receiving coupling means.

This makes it possible to confirm the overall transmission characteristics of the second transmitting/receiving device, which is a standby system.

FIG. 2 is a block diagram of the principle of the present invention; FIG. 3 is a block diagram of the principle of the present invention; FIG. 4 is a block diagram of an embodiment of the present invention; FIG. 5 is a block diagram of an embodiment of the present invention; FIG. 6 is a block diagram of an embodiment of the present invention, FIG. 7 is a block diagram of a conventional example, FIG. 8 is a block diagram of another conventional example, and FIG. 9 is a 6 GHz band frequency allocation diagram.

In the figure, 3 is a transmitting/receiving coupling means; 4 is a local switching means; 5 indicates a control section.

[Effects of the Invention] As explained in detail above, the present invention has the advantage that the transmission quality of the isolated standby transmission device can be checked during operation.

[Brief explanation of drawings]

Figure 1 is a block diagram of the principle of the present invention. 3 Transmission/reception coupling driver Book #: Ming principle diagram 07 Honne Aimei O principle block diagram No. figure Principles of this journal B month / diagram , block diagram of the 1-pack row of FM color light Figure 4 BB signal BB i word name Block diagram of the key sequence of the present invention Conventional Italian block diagram No. figure Honshuro's Pro 7 Rizu of Fuusei BB signal 8B word name Separate (7) Conventional one-row block diagram No. figure

Claims (1)

[Claims] 1. Of the first and second transmitting devices that send out transmission signals, the second transmitter is separated by a high frequency switch and becomes a standby system.
In a hot standby type transmitting and receiving device having a transmitting device and a second receiving device into which a received signal is input, when a switching control signal is input, a part of the signal emanating from the transmitting station generated by the second transmitting device the corresponding second signal instead of the receiving station oscillation signal
Local oscillator switching means (
4) Using a reflective type high-frequency switch, branching the reflected transmission signals of the first and second transmitting devices, and selecting the transmitted signal from the second transmitting device according to the input switching control signal. A transmitting/receiving coupling means (3) having a branching/selecting part (31) for performing the branching/selecting part, and a receiving coupling part (32) for supplying the output of the branching/selecting part to the first and second receiving devices; A control section (5) for controlling the operation is provided, and when monitoring the function of the second transmitting device using the second receiving device, the control section controls the transmitting/receiving coupling means and the local switching means. A standby system monitoring system characterized in that a switching control signal is sent out so that the second receiving device can receive the transmitted signal from the second transmitting device as a normal received signal. 2. The receiving coupling part is a hybrid in which the first terminal is connected to the bandpass filter, the second and fourth terminals are connected to the first and second receiving devices, and the third terminal is connected to the branching/selecting part. (321) The backup system monitoring system according to claim 1, characterized in that: (321). 3. As the reception coupling part, the first terminal is connected to the band pass filter through the circulator (412), and the second and fourth terminals are connected to the band pass filter through the circulator (412).
A hybrid (413) whose terminals are connected to the first and second receiving devices and whose third terminal is connected to a terminating resistor, and the circulator (412) is connected to the divider/selection part. A standby system monitor method. 4. In the hot standby transmitting/receiving device according to claim 1, when a switching control signal is input, a part of the transmitting station signal generated by the second transmitting device is converted into a receiving station signal. Instead, the second
Local oscillator switching means (
4), a branching/selecting part (62) for extracting a transmission signal from the second transmitter using a transfer type high-frequency switch, and a first terminal connected to a band-pass filter via a circulator (612); A transmitting/receiving coupling means (61) consisting of a hybrid (613) whose second and fourth terminals are connected to the first and second receiving devices and whose third terminal is connected to the terminating resistor, and which controls the operation of each necessary part. and a control section (5) for controlling the transmitting/receiving coupling means and the local switching means when monitoring the functions of the second transmitting device using the second receiving device. A standby system monitoring system characterized in that a switching control signal is sent to the second receiving device so that the second receiving device can receive the transmitted signal from the second backup transmitting device as a normal received signal.