JPH0292101A - Reception antenna device - Google Patents

Abstract

PURPOSE:To always obtain an optimum antenna beam directional accuracy even when it is provided at a moving body by using an element antenna to be able to bring an arbitrary shape. CONSTITUTION:An electric wave inputted into a signal synthesizer 11 outputs a synthesizing output signal and a signal to detect the dislocation angle of the front surface direction of an antenna 1 and the direction of a column sending direction. The synthesizing output signal is outputted to a first intermediate frequency output edge 6 as a first intermediate frequency signal. On the other hand, the signal output to detect the dislocation angle of the front direction of the antenna 1 and the direction of an arrival electric wave, while the phase quantity given to respective element antennas 7 is calculated by a receiving direction detecting computing element 12, is outputted as the control signal of shifters 10a and 10b of respective receiving modules 8a and 8b and inputted to a shifting controller 13. It is converted to the driving signal of the shifters 10a and 10b of respective reception modules 8a and 8b and outputted to the reception modules 8a and 8b with the shifting controller 13. Thus, by directing instantaneously the beam direction of the antenna to the prescribed direction, even when it is installed to the moving body, it can be used.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a satellite broadcasting receiver, and more particularly to a receiving antenna device that employs a needs array method as a receiving antenna.

[Conventional technology]

An example of the configuration of a conventional receiving antenna device of this type is shown in FIG. In the figure, (l) is an antenna, (2) is a low noise amplifier, (3) is a frequency converter, and (4) is a local oscillator.

(5) is a bandpass filter, and (6) is a first intermediate frequency output signal end. The operation of the conventional receiving antenna device will be explained using FIG.

Radio waves transmitted from a broadcasting satellite in a geostationary satellite orbit are mainly received by an antenna such as a bowl-shaped parabolic antenna, and are output to a low-noise amplifier (2). The received signal amplified to low noise by this low noise amplifier (2) is input to one frequency converter (3), mixed with the local frequency of one local oscillator (4), and output to a bandpass filter (5). Ru. This bandpass filter (5) extracts only the required first intermediate frequency output signal and outputs it to the first intermediate frequency output terminal (6).

[Problem to be solved by the invention]

Conventional receiving antenna devices are composed of two or more devices, and the entire device is installed outdoors. Naranari.

Space must be secured for installation.

Additionally, there are problems such as the inability to correct deviations in antenna beam direction from the time of installation.

[Means to solve the problem]

This invention was made to solve the above-mentioned problems. For example, it can be installed on a flat surface such as a roof or wall, or on a curved surface such as the roof of a moving body such as a ship, simplifying the fixing method, and preventing unused In order to provide a receiving antenna device that can utilize space and constantly correct the antenna beam direction, we used a phased array antenna system consisting of a large number of element antennas.

[Effect]

Since the receiving antenna device according to the present invention uses an element antenna that can have an arbitrary shape, a thin antenna with a single curved surface can be constructed, and by controlling the phase shifter, it can be installed on a moving body. Optimum antenna beam pointing accuracy can always be obtained.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 3. FIG. 1 is a diagram showing a configuration according to the present invention, and FIGS. 2 and 3 are diagrams explaining other inventions of the present invention. In the figure, (7) is.

The element antenna (8) is a low noise amplifier (91 and
α9 is a signal synthesizer for combining received signals, (I2 is a receiving direction detection calculator, α3 is a phase shifter controller, ([4 is a plurality of elements Antenna (a combiner that combines the received power from 71,
This is an electrical length adding circuit for directing spatially combined antenna beams in a predetermined direction.

First, the operation will be explained with reference to FIG. Radio waves emitted from a broadcasting satellite in a geostationary orbit in a predetermined direction (for example, around Japan) are received by a plurality of element antennas (7) arranged in a planar array. 7) and a receiving module (8) configured as a pair. After being low-noise amplified by the low-noise amplifier (9) built in this receiving module (81), the phase shifter a0 is used to synthesize the radio wave phases received by each element antenna (7). A signal synthesizer (ULK) outputs the signal by applying the phase amount shown in the formula and matching the phase to the arrival direction of the radio wave.

φInn=Tthθo(m'a)(・Qsφ0+n'f
ly・mφo ) - (11 where φmn: Direction of the spatially synthesized beam (ml) λ: Used wavelength φo: Angle between the X plane and φmn (raA) θo:
Angle (rad) between the z axis and φmυ perpendicular to the XY plane m, n: Number of element antennas arranged on the X and Y planes from the center of the XY plane dX, %: Arranged on the X and Y axes, respectively The radio waves input to the interval signal synthesizer (lη) of the element antenna (lη) were measured using the monopulse reception method, for example, and the angle of deviation between the synthesized output signal and the front direction of the antenna (1) and the direction of the column transmitted wave was detected. The synthesized output signal passes through the circuit system shown in the conventional example and is output as a first intermediate frequency signal to the first intermediate frequency output terminal (6).

On the other hand, the signal output that detects the deviation angle between the front direction of the antenna (1) and the direction of the incoming radio wave is processed by the receiving direction detection calculator U to calculate the phase amount given to each element antenna (71) using the formula (
11 for each receiving module (8
) is output as a control signal for the phase shifter α0, and is input to the phase shift controller 0. The phase shift controller 0 converts the signal into a phase shifter aO drive signal for each receiving module (8), and outputs the signal to the receiving module (8). Since the receiving antenna device of the present invention is configured in this way, the beam direction of the antenna can be instantaneously directed in a predetermined direction, so that the present invention can be used even when the present invention is mounted on a moving body.

Figures 2 and 3 are for actually configuring the present invention, and Figure 2 shows how a plurality of element antennas (7) are used to receive radio waves in order to reduce the number of receiving modules (8). K to be synthesized by synthesizer I. Since the element antenna (7) is arranged according to the relational expression shown in the second equation, a beam in an unnecessary direction will not be formed even if the respective phase amounts are given arbitrarily.

d=λ/[1+me00] d: Element antenna spacing λ: Used wavelength θ0: Beam scanning angle of antenna (1)... (2) The antenna (1) arranged in this way has a slightly wider beam width. Although it becomes wider, it does not cause any problem in actual use and the number of receiving modules (8) can be reduced and costs can be reduced. In addition, FIG. 3 shows that each element antenna (7) is arranged so that the antenna beam is directed in a predetermined direction in advance, considering that the incoming radio waves to be received are only from the device of the present invention and are in a more or less fixed direction. The electrical length adding circuit α9 adds a transmitted phase amount to the phase given to . With this configuration, the phase control amount range of the phase shifter a0 built in the receiving module (8) can be reduced, and when configured with a digital phase shifter, the number of bits can be reduced, and accordingly, the reception direction detection Arithmetic unit a2. Phase shift controller (13) - The amount of hardware can be reduced, making it possible to lower costs. [Effects of the invention] As described above, according to this invention, it can be configured with a planar antenna and space can be saved. In addition, even when installed in a moving body, there is an advantage that optimum reception is possible due to instantaneous phase control. Furthermore, there is an advantage that the number of receiving modules that control the cost in the actual configuration can be reduced and the cost can be reduced.

[Brief explanation of drawings]

1 to 3 are block diagrams of a receiving antenna device according to the present invention, and FIG. 4 is a block diagram of a conventional antenna device. In the figure, (1) is an antenna, and (2) is a low-noise amplifier. (3) is a frequency converter, (4) is a local oscillator, (5) is a bandpass filter, (6) is a first intermediate frequency output terminal, (7) is an element antenna, (81 is a receiving module, (9 ) is a low noise amplifier. aυ is a phase shifter, (1B is a signal combiner, a2 is a reception direction detection calculator, (+3 is a phase shift controller, a4) is a combiner, (I
9 is an electrical length addition circuit. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] A transmitter/receiver module consisting of a low noise amplifier and a phase shifter connected to each of the plurality of antenna elements, a signal synthesizer connected to the output end of the transmitter/receiver module, and a low noise amplifier connected to the output end of the transmitter/receiver module. A receiver consisting of a frequency converter, a bandpass filter and a local oscillator that supplies local power to the frequency converter is connected, the output of this receiver is taken out as a first intermediate frequency output signal, and the signal is synthesized. A receiving antenna device, characterized in that the phase shifter of the receiving module is controlled by a receiving direction detector and a phase shifter controller connected to the receiving antenna device.