JP6552042B2 - Receiver - Google Patents

Description

  The present invention relates to a wireless transmission system that performs wireless transmission between a mobile station and a base station, and more particularly to control technology of a receiving antenna of a base station (receiving apparatus).

A receiving device that receives a wirelessly transmitted signal with an antenna having directivity is used in, for example, a wireless transmission system in a remote control monitoring system.
An example of such a remote control monitoring system is a micro reception base station system including fixed wireless transmission between a mobile station and a base station using an FPU (Field Pick-up Unit).

  Conventionally, in a wireless transmission system such as an FPU system, the antenna direction adjustment work on the transmission side and the reception side is performed using communication equipment (for example, a wireless device, a mobile phone, etc.) that is not originally used in the data transmission system. At the receiving side, each worker was working while making contact. Furthermore, the antenna direction adjustment work may be advanced using the function (for example, the function of representing the reception electric field level with an audio tone, etc.) possessed by the transmission apparatus such as the FPU apparatus.

As an example of a work procedure for antenna direction adjustment, (1) the antenna direction on the transmission side is adjusted and fixed. (2) Adjust and fix the antenna direction on the receiving side. The operations of (1) and (2) are repeated, and when the direction in which the received electric field level is a peak is found, the antenna direction adjustment operation is terminated.
In the above case, for example, in Patent Literature 1, in addition to displaying the azimuth angle and elevation angle on the transmission side on the display unit on the reception side, the past position and the movement locus to the current position are displayed together, The direction in which the azimuth angle and elevation angle have changed is displayed so that the direction adjustment work is facilitated.

Also, taking the operation of the FPU used for relaying broadcast materials in Japan as an example, MIMO (Multiple-Input Multiple) is used in ARIB STD-B 57 of Non-Patent Document 1 mainly considering mobile relay. In the case where the transmission point moves like a relay car, it is necessary to sequentially adjust the antenna direction to an appropriate position where the maximum gain can be obtained at the reception point.
On the other hand, in the SISO (Single-Input Single-Output) system, a diversity reception system using a plurality of antennas is also used to improve reception characteristics.

Japanese Patent Application Laid-Open No. 2003-078467

ARIB STD-B57, "Portable OFDM digital radio transmission system for transmission of 1.2 GHz / 2.3 GHz band television broadcast program material", Radio Association of Japan

  However, since it takes a long time to improve the direction adjustment accuracy in the antenna direction adjustment work in the conventional wireless transmission system, the work can be adjusted easily, in a short time, and with high precision. Is desired.

  Further, in the MIMO method, a plurality of antennas are used to receive a signal synthesized in a transmission path space. Therefore, as a receiving antenna used in two-wave reception MIMO and diversity reception, one in which two multi-element antennas as shown in FIG. 8 are arranged is used. FIG. 8 is a diagram for explaining the structure of a conventional receiving antenna composed of a plurality of antennas, and has a structure in which two receiving antennas operate integrally, and are arranged in parallel. The two receiving antennas are rotated in the horizontal (pan) direction or the vertical (tilted) direction, and are integrally operated in the signal arrival direction.

In broadcast relay using FPU, in order to increase the received electric field strength, the receiving antenna is operated so as to obtain the maximum gain. Therefore, in the case of road race relay in which the transmission point moves, it is necessary to always follow the relay vehicle or motorcycle that is the transmission point at the reception point.
However, in two-wave reception MIMO and diversity reception, when two receive antennas arranged for two-wave reception are used, if one receive antenna is used as a reference, the other receive antenna can obtain the maximum gain. There may not be. For example, FIG. 9 is a diagram for explaining the difference in angle between the transmission point and the reception antenna when the two reception antennas shown in FIG. 8 are used. As shown in FIG. 9, when the transmission point moves from (A2) to (A1) and the distance becomes a short distance (r2 → r1), the angle formed between the transmission point and the two reception points becomes large. Since it changes (θ2 → θ1), one of the receiving antennas 2 is greatly out of the maximum gain direction.
Therefore, if one of the receiving antennas cannot obtain an appropriate received electric field strength, the reception performance due to the two-wave reception MIMO or diversity reception of the receiving device is degraded.

Therefore, in order to direct all the receiving antennas in the direction in which the maximum received electric field strength can be obtained, each must be individually operated, and the number of antenna operators and tripods increases according to the number of receiving antennas.
In addition, when an operation using a turntable installed in a base station is performed, it is necessary to install as many turntables as the number of reception antennas in a radio tower with a limited installation location.

In an FPU device that always requires a constant transmission power adapted to the standard ARIB STD-B 57 of Non-Patent Document 1, the reception electric field strength also increases in near field transmission where the influence on the antenna angle is large. There is little influence that leads to deterioration.
On the other hand, in WiMAX (registered trademark) (IEEE802.16e), transmission power control according to the transmission distance is defined in order to reduce the power consumption of the terminal. When the transmission power is lowered in short-distance transmission, it is expected that the reception performance is deteriorated due to the influence of the antenna angle.

  The present invention has been made in view of such a situation, and efficiently controls the directions of a plurality of reception antennas performing multi-reception by making the position of the transmission antenna of the mobile station which is the transmission source follow. It is an object of the present invention to provide a receiving apparatus capable of reducing the equipment cost and reducing the number of operation steps of the operator.

  In order to achieve the above object, a receiving apparatus according to the present invention is a receiving apparatus that controls the directions of a plurality of receiving antennas that perform multi-receiving by following the position of a transmitting antenna of a mobile station that is a transmission source. And, when a change occurs in the tilt angle of the first reception antenna following the transmission antenna of the mobile station, the angle control changes the angle of the other reception antenna to a predetermined pan angle according to the change degree Characterized in that it comprises means.

  In order to achieve the above object, the receiving apparatus according to the present invention is the receiving apparatus described above, wherein the angle control means sets the pan angle with respect to the tilt angle at a predetermined ratio. It features.

  In order to achieve the above object, a receiving apparatus according to the present invention is the above-described receiving apparatus, comprising a storage unit that stores a ratio of the pan angle to the predetermined tilt angle.

  In order to achieve the above object, the receiving apparatus according to the present invention is the above-described receiving apparatus, wherein the angle control means has a distance between the transmitting antenna of the mobile station and the plurality of receiving antennas. The pan angles of the plurality of receiving antennas are changed when the distance is shorter than a predetermined distance.

  According to the present invention, it is possible to efficiently control the direction of a plurality of reception antennas that perform multi-reception by following the position of the transmission antenna of a mobile station that is a transmission source. It is possible to provide a receiver capable of reducing the number of operation steps.

It is a block diagram which shows the structure of the radio | wireless transmission system which concerns on Embodiment 1 of this invention. It is a block diagram which shows the structure of the receiver (base station) which concerns on Embodiment 1 of this invention. It is a figure for demonstrating the structure of the receiving antenna of the receiver which concerns on Embodiment 1 of this invention. It is a figure which shows an example of an angle correction value table. It is explanatory drawing for demonstrating how to obtain | require the correction value of the angle correction value table of FIG. It is a flowchart which shows the direction adjustment process of the 2nd rotation receiving antenna part in the receiver (base station) which concerns on Embodiment 1 of this invention. It is a block diagram which shows the structure of the radio | wireless transmission system which concerns on Embodiment 2 of this invention. It is a figure for demonstrating the structure of the receiving antenna comprised with the conventional several antenna. When using two receiving antennas shown in FIG. 8, it is a figure for demonstrating the difference in the angle which a transmitting point and a receiving antenna comprise.

First Embodiment
Hereinafter, a radio transmission system according to Embodiment 1 of the present invention will be described with reference to FIG. FIG. 1 is a block diagram showing a configuration of a wireless transmission system according to Embodiment 1 of the present invention. FIG. 1 shows, for example, a micro reception base station system, which performs radio transmission between a mobile station and a base station using an FPU (Field Pick-up Unit).

In FIG. 1, a case where material (data) is transmitted from a moving transmitter 10 such as a relay car or a helicopter at the transmission point (A) to the non-moving base station 20 at the reception point (B) explain. The material to be transmitted is, for example, a material such as video, audio, data used for broadcasting.
The transmission unit 11 of the mobile transmitter 10 at the transmission point (A) converts the material into a microwave signal that can be wirelessly transmitted, and transmits it as a radio wave from the transmission antenna 12. Here, the transmitter 11 encodes an SDI (Serial Digital Interface) signal into a TS (Transport Stream) signal, which is a frame format of a fixed-length packet format used for FPU transmission, and modulates it to an intermediate frequency signal After that, it has a function of converting the frequency to a microwave band signal and outputting it to the transmitting antenna 12.

The base station 20, which is a receiving apparatus, controls the antenna direction of the first rotary receiving antenna unit 21, the second rotary receiving antenna unit 22, and the first rotary receiving antenna unit 21, which receive radio waves transmitted from the transmitting antenna 12. The first antenna reception control unit 23, the first reception unit 25, the second reception unit 26, the remote control monitoring unit 24, the reception signal control unit 27, and the reception signal output unit 28.
When a plurality of rotary receiving antennas are installed, at least each of them is installed by being shifted several meters vertically and horizontally, so that it is difficult to simultaneously receive the influence of an obstacle or a reflected wave.

  In wireless transmission using the wireless transmission system of FIG. 1, it is important for the base station 20 to efficiently receive radio waves from the mobile transmitter 10 of the transmission point (A). That is, depending on the position of the transmission point (A), it is necessary to change the directions of the antennas of the first rotation reception antenna unit 21 and the second rotation reception antenna unit 22 in the base station 20 at the reception point (B). Therefore, in the base station 20 that receives microwaves, the first rotation reception antenna unit 21 that is a main reception antenna includes a rotation base that can be rotated (tracked) by control from the first antenna reception control unit 23. There is. The second rotating receiving antenna unit 21 that is a sub receiving antenna includes a rotating gantry that can be rotated (tracked) by control from a direction adjustment control unit 243 of a remote control monitoring unit 24 described later.

The first receiving unit 25 decodes the received signal received by the first rotary receiving antenna unit 21 into, for example, an SDI signal and outputs the decoded signal to the received signal control unit 27.
The second reception unit 26 decodes the reception signal received by the second rotary reception antenna unit 22 into, for example, an SDI signal and outputs the decoded signal to the reception signal control unit 27.
The first receiving unit 25 and the second receiving unit 26 only need to have a function of converting to a TS signal without signal deterioration at a minimum.
The reception signal control unit 27 selects or combines the reception signal output from the first reception unit 25 or the reception signal output from the second reception unit 26 based on the radio wave monitoring information output from the remote control monitoring unit 24. And output to the reception signal output unit 28.
The reception signal output unit 28 transmits the material to a main store or the like (not shown).

Next, the operation of the base station that is the receiving apparatus according to Embodiment 1 of the present invention will be described using FIG. 1 and FIG. FIG. 2 is a block diagram showing the configuration of the receiving apparatus (base station) according to Embodiment 1 of the present invention.
The first rotation receiving antenna unit 21 of the base station 20 receives the radio wave 101 transmitted from the transmitting antenna 12 and outputs it to the first receiving unit 25. Here, the first receiving unit 25 has a function of frequency-converting a microwave band signal into an intermediate frequency band signal, demodulating it into a TS signal, decoding it into an SDI signal, and outputting the signal to the reception signal control unit 27.

  The second rotary receiving antenna unit 22 receives the radio wave 101 transmitted from the transmitting antenna 12 and outputs the radio wave 101 to the second receiving unit 26. Here, as with the first receiver 25, the second receiver 26 frequency-converts a microwave band signal into an intermediate frequency band signal, demodulates it into a TS signal, decodes it to an SDI signal, and controls received signals. It has a function of outputting to the part 27.

Here, a specific hardware configuration of the first rotation receiving antenna unit 21 and the second rotation receiving antenna unit 22 will be described with reference to FIG. FIG. 3 is a diagram for explaining the structure of the reception antenna of the reception apparatus according to Embodiment 1 of the present invention.
The first rotation receiving antenna unit 21 includes a first receiving antenna 21a, a pan direction driving unit 21b, and a tilt direction driving unit 21c. The second rotation receiving antenna unit 22 includes a second receiving antenna 22a and a pan direction driving unit 22b. Further, as shown in FIG. 3, the first receiving antenna 21a is fixed to the upper portion of the base portion 211 via a support column 212, and the second receiving antenna 22a is fixed to the upper portion of the base portion 211 via a support column 213. It is attached so that it may rotate independently by the direction drive part 22b. The first receiving antenna 21a and the second receiving antenna 22a are integrally rotated in the tilt direction by the tilt direction driving unit 21c of the first rotating receiving antenna unit 21, and the panning direction driving of the first rotating receiving antenna unit 21 is performed. By the portion 21b, it is configured to integrally rotate in the pan direction.

The first antenna reception control unit 23 receives the directional radio wave 101 in the micro frequency band transmitted from the mobile transmitter 10 such as a relay car or a helicopter in the vertical and horizontal directions from the received signal received by the first rotation receiving antenna unit 21. The difference in electric field strength is detected, and the direction of the first rotary receiving antenna unit 21 is adjusted in the direction in which the received electric field strength is high.
The detection of the received electric field strength difference of the first antenna reception control unit 23 can be tracked even under a condition lower than the demodulated received electric field strength of the first receiving unit 25 (about 20 dB). If the second rotating receiving antenna unit 22 is linked to the first rotating receiving antenna unit 21 that operates even under conditions that cannot be demodulated, there is a possibility that video and audio can be demodulated.

Next, the configuration and operation of the remote control monitoring unit 24 of FIG. 2 will be described.
The remote control monitoring unit 24 includes a first rotation reception antenna angle monitoring unit 241, a second rotation reception antenna angle monitoring unit 244, a direction adjustment control unit 243, a first reception monitoring unit 245, and a second reception monitoring unit 247. And a reception state comparison unit 246.

The first rotation receiving antenna angle monitoring unit 241 monitors angle information that is the reception direction of the first rotation receiving antenna unit 21.
The second rotation reception antenna angle monitoring unit 244 monitors angle information that is the reception direction of the second rotation reception antenna unit 22.

The direction adjustment control unit 243 controls the angle of the reception direction of the second rotary reception antenna unit 22.
The direction adjustment control unit 243 has an angle correction value table 500 corresponding to the reception angle information of the first rotation receiving antenna unit 21, and the angle correction value table 500 is used to configure the second rotation receiving antenna unit 22. Adjust the angle in the receiving direction.
Note that the direction adjustment control unit 243 may control the angle of the reception direction of the second rotation reception antenna unit 22 without using the angle correction value table 500 described above.

Here, the angle correction value table 500 described above will be described with reference to FIGS. 4 and 5. FIG. 4 is a diagram showing an example of the angle correction value table, and FIG. 5 is an explanatory diagram for explaining how to obtain the correction value of the angle correction value table of FIG.
As shown in FIG. 5, the first rotating receiving antenna unit 21 which is the main receiving antenna of the base station 20 is installed at a height of height (H) from the ground, and the point is defined as a receiving point (B). To do. In addition, it is assumed that the mobile transmitter 10 is at a transmission point (A1) or a transmission point (A2) during movement.
For example, when the mobile transmitter 10 is at the transmission point (A1), since the tilt angle of the first rotating reception antenna unit 21 is (α1), the height from the ground (= altitude difference) (H1) is used. The linear distance (r1) from the transmission point (A1) to the reception point (B) can be obtained. Further, if the distance (L) and the linear distance (r1) between the first receiving antenna 21a and the second receiving antenna 22a shown in FIG. 3 are used, a correction value (β11 is obtained as shown in FIG. ) Can be calculated.
Further, for example, when the mobile transmitter 10 is at the transmission point (A2), the tilt angle of the first rotation receiving antenna unit 21 is (α2), so the transmission point (A2) based on the altitude difference (H1). A straight line distance (r2) from the reception point (B) to the reception point (B) can be obtained. Furthermore, if the distance (L) between the first receiving antenna 21a and the second receiving antenna 22a and the linear distance (r2) shown in FIG. 3 are used, a correction value (β12 is obtained as shown in FIG. ) Can be calculated.
That is, in the angle correction value table 500, an altitude difference 501 (H) and a correction value (β) for the tilt angle 502 (α) of the first rotation receiving antenna unit 21 are registered.

The first reception monitoring unit 245 monitors the reception state of the first receiving unit 25. The second receiver monitoring unit 247 monitors the reception state of the second receiver 26.
The reception state comparison unit 246 includes the angle information output from the first rotation reception antenna angle monitoring unit 241, the angle information output from the second rotation reception antenna angle monitoring unit 244, and the reception state of the first reception monitoring unit 245. And the reception state of the second reception monitoring unit 247 are compared, and the comparison result is output to the reception signal control unit 27.

For details of the operation of the reception state comparison unit 246, the reception states of the first reception unit 25 and the second reception unit 26 are monitored, and the reception state according to the prescribed conditions such as reception field strength, BER, constellation convergence, reflected wave state The SDI signal of the first receiving unit 25 or the second receiving unit 26 that is less than a predetermined specified value is not selected.
In addition, the reception state comparison unit 246 monitors the angle of each rotation reception antenna unit and determines that reception is not possible in a specific direction due to predetermined installation conditions (such as a steel tower, other antennas, shielding by surrounding buildings, etc.). The SDI signal of the first receiving unit 25 or the second receiving unit 26 that is likely to become is not selected.

The reception signal control unit 27 outputs the reception signal output from the first reception unit 25 or the second reception unit 26 based on the reception state comparison result in the two reception units output from the reception state comparison unit 246. The received signal is selected or combined and output to the received signal output unit 28.
When a seamless switching device is used for the reception signal control unit 27, two SDI signals are constantly monitored, and when a signal disconnection, a video freeze, an audio mute, or the like is detected, a system without interruption and a normal channel can be obtained. By performing the automatic switching, it is possible to cope with a momentary abnormality.
The reception signal output unit 28 transmits the material to a main store or the like (not shown).

Next, the direction adjustment control in the reception direction of the second rotating reception antenna unit 22 in the base station 20 will be described with reference to FIG. FIG. 6 is a flowchart showing the direction adjustment processing of the second rotation reception antenna unit in the reception apparatus (base station) according to Embodiment 1 of the present invention.
In step S <b> 101, the direction adjustment control unit 243 acquires angle information of the first rotation reception antenna unit 21 from the first rotation reception antenna angle monitoring unit 241.
In step S102, the direction adjustment control unit 243 determines whether or not the tilt angle of the first rotation receiving antenna unit 21 is equal to or less than a predetermined reference value from the obtained angle information of the first rotation receiving antenna unit 21. If it exceeds (NO), the process is terminated, and if it is less than the reference value (YES), the process proceeds to step S103.
In step S103, the direction adjustment control unit 243 refers to the angle correction value table 500 stored in the storage unit (not shown) and determines the height difference (H) between the transmission point (A) and the reception point (B) and the first rotation. The pan angle correction value (β) corresponding to the tilt angle (α) of the receiving antenna unit 21 is read and transmitted to the second rotating receiving antenna unit 22.
In step S <b> 104, the second rotation receiving antenna unit 22 performs pan angle adjustment based on the pan angle correction value (β) information transmitted from the direction adjustment control unit 243.
Note that the base station 20 performs the processing from step S101 to step S104 at a predetermined time interval. Further, the base station 20 may acquire the reception status information of the second reception unit 26 from the second reception monitoring unit 247 and execute the above-described processing according to the reception status of the second reception unit 26.

  As described above, according to the receiving apparatus of the wireless transmission system according to the first embodiment of the present invention, the directions of a plurality of receiving antennas that perform multi-receiving by following the position of the transmitting antenna of the mobile station that is the transmission source. Can be efficiently controlled, and equipment costs can be reduced and the number of man-hours for the operator can be reduced.

Second Embodiment
Hereinafter, a radio transmission system according to Embodiment 2 of the present invention will be described with reference to FIG. FIG. 7 is a block diagram showing a configuration of a wireless transmission system according to Embodiment 2 of the present invention. FIG. 2 shows, for example, a micro reception base station system that performs radio transmission between a mobile station and a base station using an FPU (Field Pick-up Unit).
Note that the wireless transmission system according to the second embodiment of the present invention is different from the wireless transmission system according to the first embodiment of the present invention in that the mobile transmitter 10 at the transmission point (A) includes the position data measuring unit 13 and the position data processing. The base station 20 at the reception point (B) includes a first antenna reception control unit 29 instead of the first antenna reception control unit 23. Moreover, about the structure similar to FIG. 1, the same reference number is attached | subjected and description is abbreviate | omitted.

  In FIG. 7, the mobile transmitter 10 includes a position data measurement unit 13 capable of measuring the current position of the mobile transmitter 10 that can move arbitrarily. The position data measuring unit 13 is, for example, a GPS (Global Positioning System) receiver that is often used at present. Necessary data out of the latitude, longitude, altitude information and attribute data obtained from the GPS receiver is processed into a predetermined data array by the position data processing and modulation unit 14 and modulated into an audio signal, from the transmission unit 11 It transmits to the base station 20 via the transmitting antenna 12. In addition, about processing of the above-mentioned data, depending on the scale of the system, there is also a case where only modulation is performed as it is without processing signal data obtained from the GPS receiver.

  In the base station 20, a signal in the microwave frequency band to which position data is added is received by the first rotation receiving antenna unit 21 together with the video and audio signals, and the received position data is received by the first antenna reception control unit 29. Output to

The first antenna reception control unit 29 extracts a position data signal including the latitude, longitude, and altitude information of the mobile transmitter 10 input from the first rotation receiving antenna unit 21. Next, the first antenna reception control unit 29 determines the first rotation reception antenna unit based on the extracted position data of the mobile transmission body 10 and the latitude, longitude, and altitude information of the first rotation reception antenna unit 21 registered in advance. The coordinate calculation process for calculating | requiring the azimuth of the transmission antenna 12 (transmission point (A)) seen from 21 (reception point (B)) is performed. Similarly, the transmitting antenna 12 (the receiving point (B)) viewed from the first rotating receiving antenna unit 21 (receiving point (B)) based on the position data of the mobile transmitter 10 and the latitude, longitude, and altitude information of the first rotating receiving antenna unit 21. An arithmetic process is performed to obtain the elevation angle of the transmission point (A). As the altitude data of the first rotation receiving antenna unit 21 serving as a reference for the elevation angle, only the elevation data of the first rotation receiving antenna unit 21 or a value obtained by adding up to the ground height and the radiation height of the first rotation receiving antenna unit 21 is used. To do.
Furthermore, the first antenna reception control unit 29 compares the determined azimuth angle and elevation angle with the current azimuth angle and elevation angle of the first rotary receiving antenna unit 21 to adjust the azimuth angle change amount and elevation angle change amount to be adjusted. Is calculated and output to the first rotary receiving antenna unit 21 as control information.

  The first rotation reception antenna unit 21 is configured as shown in FIG. 3 based on the control information on the azimuth angle change amount and the elevation angle change amount input from the first antenna reception control unit 29. The pan direction drive unit 21b and the tilt direction drive unit 21c. To control the direction of the first reception antenna 21a.

  In the above-described embodiment, the direction adjustment of the first rotation receiving antenna unit 21 is automatically performed. However, as disclosed in Patent Document 1 (Japanese Patent Application Laid-Open No. 2003-078467), the display unit Simultaneously displays the map, the azimuth angle of the transmitting equipment as seen from the receiving equipment, the elevation angle, and the current transmitting equipment position transmitted from time to time, and displays the past position and the movement locus up to the present together. Furthermore, the operator may manually adjust the direction of the first rotary receiving antenna unit 21 by displaying in which direction the azimuth angle and the elevation angle have changed.

  Further, the direction adjustment control of the receiving direction of the second rotary receiving antenna unit 22 in the base station 20 is the same as the flowchart of FIG. 6 described above.

  As described above, according to the receiving apparatus of the wireless transmission system according to the second embodiment of the present invention, the directions of a plurality of receiving antennas that perform multi-receiving by following the position of the transmitting antenna of the mobile station that is the transmission source. Can be efficiently controlled, and equipment costs can be reduced and the number of man-hours for the operator can be reduced.

  The present invention is not limited to the above embodiment as it is, and at the implementation stage, the constituent elements can be modified and embodied without departing from the scope of the invention. In addition, various inventions can be formed by appropriate combinations of a plurality of components disclosed in the above embodiments. For example, some components may be deleted from all the components shown in the embodiment.

  The present invention relates to a wireless transmission system that performs wireless transmission between a mobile station and a base station, and in particular, is used in the control technology of a receiving antenna of a base station (receiving apparatus).

10: mobile transmitter, 11: transmitting unit, 12: transmitting antenna, 13: position data measuring unit, 14: position data processing modulation unit, 20: base station, 21: first rotation receiving antenna unit, 21a: first reception Antenna, 21b: Pan direction drive unit, 21c: Tilt direction drive unit, 22: Second rotation reception antenna unit, 22a: Second reception antenna, 22b: Pan direction drive unit 22b, 23: First antenna reception control unit, 24 : Remote control monitoring unit 25: first receiving unit 26: second receiving unit 27: received signal control unit 28: received signal output unit 101: radio wave 211: base unit 212: post 213: post 241: first rotation receiving antenna angle monitoring unit 243: direction adjustment control unit 244: first rotation receiving antenna angle monitoring unit 245: first reception monitoring unit 246: reception state comparison unit 247: second Shin monitoring unit, 500: angle correction value table 501: altitude difference, 502: tilt angle.

Claims (4)

A receiving apparatus that controls the direction of a plurality of receiving antennas that perform multi-reception by following the position of a transmitting antenna of a mobile station that is a transmission source,
When a change occurs in the tilt angle of the first receiving antenna following the transmitting antenna of the mobile station, the angle of the other receiving antenna is determined by the difference in altitude between the transmitting point and the receiving point, and the first receiving after the changing. A receiving apparatus comprising angle control means for changing to a predetermined pan angle according to a tilt angle of an antenna .   The receiving apparatus according to claim 1, wherein the pan angle to the tilt angle is set at a predetermined ratio in the angle control means.   The receiving apparatus according to claim 2, further comprising: a storage unit that stores a ratio of a pan angle to the predetermined tilt angle.   4. The receiving apparatus according to claim 3, wherein the angle control means is configured to receive the plurality of receiving antennas when a distance between the transmitting antenna of the mobile station and the plurality of receiving antennas is shorter than a predetermined distance. A receiver characterized by changing the pan angle of.