JPH0336829A - Orthogonal polarized wave receiver - Google Patents

Abstract

PURPOSE:To improve the crosstalk performance by providing a channel selection circuit, a ferrite polarized wave selector, a selection signal generator and a data storage means and giving a data stored in the data storage means to the selection signal generator when the channel is selected. CONSTITUTION:Either a horizontal or a vertical polarized wave is selected from a received signal at a ferrite polarized wave selector 2, the result is subject to frequency conversion at a converter 3 to obtain a 1st intermediate frequency signal. A tuner 4 a PLL channel selection circuit 11 which converts the 1st intermediate frequency signal into a 2nd intermediate frequency signal and it is demodulated by a demodulation circuit. An external data is inputted by an external input circuit 5 at channel selection, it is decoded and a channel selection data of a desired channel is read from a RAM 7 to generate a channel selection data. Moreover, a polarized wave selection data corresponding to the channel selection data is read. Then the channel selection data is fed to a D/A converter 8 and the polarized wave selection data is fed to a D/A converter 9. Thus, the channel selection without crosstalk at an adjacent channel is attained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention 1 (Industrial Field of Application)] The present invention relates to a 1a cross-polarized wave reception device that selectively receives radio waves from a communication satellite in two orthogonal polarized waves.

(Prior art) Communication satellite signals use vertical polarization and horizontal polarization for each channel signal in order to utilize the orthogonality of polarization to effectively utilize frequencies. As shown in Figure 4, radio signals have different polarizations between adjacent channels. Therefore, in order to receive such radio waves, it is necessary to distinguish between superposition polarization and horizontal polarization. , polarization isolation performance that does not cause adjacent channel interference is required.

FIG. 5 shows a communication mi! that selectively receives the above-mentioned orthogonal polarized waves.
The configuration of the +2 signal receiving device is shown.

In FIG. 5, 1 is a parabolic antenna installed outdoors, and 4 is an indoor tuner. Parabolic antenna 1
A ferrite polarization selector 2 selects either horizontal polarization or vertical polarization of the received signal. The output of the ferrite polarization selector 2 is converted to a first intermediate frequency by a converter 3 and guided to a juncture 4.

The tuner 4 converts the signal from the 21 inverter 3 into P L
The L tuning circuit 11 converts it to a second intermediate frequency, and the demodulation circuit 12 further converts the FM wave to 11'JJ.

6 is a microphone L1 computer (hereinafter referred to as CP) for channel selection control.
Based on signals from an external t'ilf input circuit 5/) 1 such as a remote controller, the 'S LJ data is extracted from a random address memory (hereinafter referred to as RAM) 7.

For channel selection data, go to D/8 e;
j: is converted to j, and the above-mentioned PLLmF=3 circuit 11 is controlled 1211. Yo, CP
U6 converts the selection data (vertical polarization in the horizontal stage) for selecting one polarization component assigned to each channel to "<
Read from M7. The D/A converter 9 sends the read data to the current generation circuit 10, and the light radiation selector 2 converts vertical polarization or water 1L polarization according to the current from the current generation circuit 10. tj- to choose one or the other
ing.

In this article, the ferrite polarization selector 2 is composed of a coil wound around a non-C light, and it is possible to select one of the polarizations depending on the size of the constant current flowing through the coil. "

That is, the output of the polarization selector 2 has mutually exclusive current vs. passage loss characteristics due to the orthogonal VT of the horizontal polarization and vertical polarization, and the output of the polarization selector 2 is horizontal at a constant current of 11 When the passing IQ loss of polarized waves is the minimum, the passing loss of vertically polarized waves is 100%, and at I2, which is different from 11/↑, the passing loss of horizontally polarized waves is maximum, and the passing loss of vertically polarized waves is the same. 1, the current generating circuit 10 generates a constant current 11.12 as shown in the following.

FIG. 6 shows the above current vs. passing R1 and loss characteristic P1,
The vertical axis shows 1 loss in passing, and the horizontal axis shows the horizontal polarization.When the current is 11, the passing loss is the minimum, and the dotted line shows the vertical polarization. The loss of the current 12 is the maximum, and the loss of the vertical irj polarized wave is the maximum.
The 1tl loss is the minimum, and the horizontally polarized wave transmission ha loss is the maximum.

Therefore, it is sufficient to write polarization selection data corresponding to the currents II and 12 in the RAM 7.

However, when the above current vs. passing loss characteristic i is examined in detail, it has a frequency characteristic, and the Boo of C? All you have to do is give II and +2 uniformly to each channel (there is no ]r).

FIG. 7 shows the passing and one-loss F1 properties at a different frequency from FIG. 5. At frequency fl, each polarization component is extracted and buried by setting II and +2 as described in [111] (Figure 6), but at frequency fl'2, each flu is output. The current value that produces horizontal polarization 'c1.
L [+ l31C deviation, vertical 11゛1 polarization T: IJ
[Shifts from 271S to I4.

For this reason, conventionally, polarization isolation is self-reflecting f in a channel with a certain frequency 1''1, but there is a possibility that interference may occur in another frequency +2.

In addition, as a countermeasure to the above problem, it is possible to store an intermediate value between 11 and +3 and an intermediate value between 12 and 14 (1r1) in the RAM 7, but this would deteriorate the interference performance in all channels.

(Problem to be Solved by the Invention) The orthogonal polarization receiver rI receives a signal by selectively selecting two orthogonal polarization components using polarization selection data. The selected current to extract the component versus the passing loss characteristic is the polarization component (by using the fact that J1 has the opposite property, the current I for which 1 loss in passing is 111 small)
I, the data that generated [7 was corrupted to RAM7.

However, the above current 11゜12 (Y, because there is a difference depending on the frequency, there is no interference at one frequency, but at another frequency, the vertical polarization and horizontal polarization interfere and cause interference. There was a problem.

The present invention aims to eliminate the above-mentioned problems and provide a high-quality IIT cross-polarized wave receiving device that has good II wave selection performance for any frequency.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a tuning circuit that can tune a plurality of radio signals in which two orthogonal polarized waves are assigned to each channel to match each receiving frequency. , ferrite width wave selection information that selectively outputs polarized wave components by means of an intervening circuit corresponding to the direction of the orthogonal polarized waves, and furthermore, the selected signal can be adjusted by 1) 1 decrease according to the selected data. a selection signal generation circuit intervening in the f-tunnel 16; a data storage means for storing selection data in the f tunnel 16; (JL supply data supply means).

(Effect) According to this new configuration, depending on the channel,
The selector C 8:3 can be adjusted to increase or decrease Jl and stored in the form of a digital signal 0 which provides the optimum selection current. As a result, at the same time as the channel selection operation, the optimal selection current is supplied to the light polarization selector (Jt), and interference is improved.

(Example) Hereinafter, the present invention will be explained in detail with reference to illustrated examples.

FIG. 1 is a block diagram showing an embodiment of an orthogonal polarization receiving apparatus according to the present invention.

Components 43 in FIG. 1 that are the same as those in FIG. Select one of the horizontal and vertical polarized waves at The frequency is converted to a second intermediate frequency by the Pt-1-tuning circuit 11, and this is demodulated by the demodulation 1rl+ path 12.The tuner 4 controls the CPU 6 for tuning system y0, and Pt-1
The tuning circuit 11 receives the tuning data from C1]U6 as D/A.
The output converted into an analog signal by the converter 8 is used. In addition, in the above channel selection data, R is determined by the external input data from the external input circuit 5.
Acknowledging AM7 - Generated from QRAM7.

Further, the CPU 6 is capable of writing polarization selection data of the same number as the number of channels into the RAM 7 so as to generate selection currents to the ferrite polarization selector 2 for the number of channels. The polarization selection data of the same number as the number of channels is the selection current increase/decrease data 13 generated by the external input circuit 13.
By a, it is possible to harm and change tυ.

According to the orthogonal polarization receiver 45 B having such a configuration, as shown in FIG. The channel selection data is read out from the RAM 7J (step S2), and the channel selection data is generated. Roughly,
The polarization selection data corresponding to the selection r4 data of the rare 91 channel is output from RAM 7 (step 8.3).
). After this, step S1 (supplying the channel selection data to the D/A converter 8), step S5 (supplying the polarization selection data to the D/A converter 8), step S5 (supplying the polarization selection data to the
/A converter 9), it becomes possible to select a channel without interference from adjacent channels.

In addition, the polarization selection data that generates the optimal selection current is RA
When entering M7, proceed as shown in Figure 3.

In FIG. 3, steps 86 to S8 are the same as S+, 82.84 in FIG. 2, and are for generating channel selection data and selecting the red channel. After selecting the desired channel, perform slap S9 and connect external input circuit 1.
3, J generates the increase/decrease data 13a and converts it to D/A.
The current is supplied to a current generating circuit 10 via a converter 9. Suichitsubu S +o -S +/31; L, above increase/decrease data 1
This is a step of increasing/decreasing the selection current by step 3a. In the above step 813, there is interference in the received value (S) (NO)
If 113, repeat steps 310 to 313.

If there is no interference (YES) in step 813, the input of the increase/decrease data 13a from the external input circuit 13 is stopped, and the selection data based on the current selection current is stored in the RAM 7. This allows RAM7 to switch to the optimal selection current.
The corresponding polarization selection data is written. Next, in step 816, it is determined whether polarization selection data for all channels have been written, and the above process is repeated for each channel. At step 316, it is determined that the writing for all channels has been completed, and the i-taka writing of the optimal selection current is completed.

In this way, according to the receiving device of this embodiment, it is possible to finely adjust and form the optimum selection current for each channel, and to store data for generating the selection current in the memory.

As for the data to be written to RAM, as in the past, the selection current corresponding to vertical and horizontal polarization at one frequency is set at input/output/υ, and when selecting another frequency, the selection current is set at It is preferable to generate increase/decrease data by checking each time a selection is made so that the reception state can be adjusted.

[Effects of the Invention] As explained above, according to the present invention, it is possible to receive the city wave signal 23 in which orthogonal polarizations are assigned to adjacent channels in a good state with improved interference performance.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the orthogonal polarization receiver "7" according to the present invention, FIGS. 2 and 3 are flowcharts explaining the operation of the embodiment of FIG. 1, and FIG. is an explanatory diagram explaining the channel arrangement of signals to which orthogonal polarization is assigned as a channel signal; It is a characteristic diagram showing the current vs. passage 1 (-1 loss characteristics) of the I5ite polarization selector. 1... Parabolic Ann I, 2... Ferrite polarization selector, 3... Converge, 4 ... f-1-su, 5.
13...External input circuit, 6...CPU, 7...R
AM, 8.9...D/A converter, 10...Current generation circuit, 11...PLL channel selection circuit, 12...Biton circuit. Figure 1: Hyoheiting East 44 ￥采

Claims (1)

[Scope of Claims] A tuning circuit that tunes a plurality of radio wave signals in which two orthogonal polarized waves are assigned to the rear of the channel signal, according to each receiving frequency, and each polarized wave in the orthogonal polarized waves. A ferrite polarization selector that selectively outputs a polarized wave component using a selection signal corresponding to the direction; a selection signal generation circuit that generates the selection signal so that it can be increased or decreased based on selection data; The present invention further comprises a data storage means for storing selection data corresponding to a polarization component, and a data supply means for supplying the data stored in the data storage means to the selection signal generation circuit when the tuning circuit selects a channel. Features orthogonal polarization receiver.