JP2948396B2 - Flying object data transmission device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flying object data transmission apparatus.

[0002]

2. Description of the Related Art FIG. 4 is a block diagram showing a functional configuration of a conventional flying object data transmitting apparatus. As shown in FIG. 4, a conventional flying object data transmission device is provided with a power divider 11 for distributing a transmission output to element antennas 14-1 to 14-n, and a power divider 11 for distributing the transmission output in response to an antenna switching command. Transmission output to the selector switch 13
, A transmission output from the power divider 11, and an element antenna 14 in response to an instruction from the selector switch driver 12.
A selector switch 13 for connecting or disconnecting between the power divider 11 and a plurality of element antennas 14-1 to 14-, each of which has directivity determined;
n.

The transmission output input to the power divider 11 is distributed by the number of element antennas 14-1 to 14-n and guided to the selector switch 13. On the other hand, according to the antenna switching command input to the selector switch driver 12, the selector switch 13 causes the power divider 1 to emit radio waves only from the selected element antenna.
1 and a circuit of a predetermined element antenna are connected.

[0004]

As described above, in the conventional flying object data transmitting apparatus, the element antennas 14-1 to 14-1 are used.
4-n, an element antenna whose directivity is determined in the direction of the receiver is selected to emit a radio wave.

Therefore, it is necessary to issue a dynamic antenna switching command in accordance with a change in the relative position of the flying object with respect to the receiver, and a high response antenna switching circuit (selector). A switch driver 12 and a selector switch 13) are required.

However, in the conventional antenna switching circuit, when the relative position between the flying object and the receiver changes drastically, it is difficult on the circuit to perform switching according to the change. Was. In addition, since directivity is determined for each of the element antennas 14-1 to 14-n, it has been difficult to obtain an optimal transmission pattern for continuous movement.

[0007] The present invention has been made in view of the above points, and it is possible to obtain a stable reception level in a receiver even when the relative position between the receiver and the receiver changes drastically. An object is to provide a body data transmission device.

[0008]

SUMMARY OF THE INVENTION The present invention is directed to a flying object data transmitting apparatus mounted on a flying object and radiating radio waves from an array antenna to a receiving device. Means, preset means for setting the set value of the antenna pattern in the initial state,
Adjusting means for adjusting the attenuation and phase of the transmission output for each element antenna of the array antenna based on the relative angle obtained by the control calculation means or the set value set by the preset setting means. It is configured.

[0009]

According to this configuration, when the flying object is mounted on an aircraft or the like, radio waves are radiated from the array antenna in the antenna pattern set by the preset means (preset circuit), and the non-mounted state is set. At the time, control is performed so that radio waves are emitted in the relative angular direction obtained by the control calculation means (control computer).

[0010]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a flying object data transmitting apparatus according to the embodiment. In FIG. 1, a power divider 1 receives a transmission output and distributes the transmission output to element antennas 7-1 to 7-N of an array antenna 7 described later.

The preset circuit 2 stores and outputs a command value in an initial state to selector switches 4a and 4b described later, that is, an antenna pattern in the initial state. The command value stored in the preset circuit 2 can be changed by an external command (preset value change command).

The control computer 3 is provided with a position / attitude angle of the transmitter,
Data indicating the position of the receiver is input, and the relative angle is calculated and output. Further, data indicating whether the flying object is mounted on an aircraft or the like is input, and selector switches 4a and 4b are input.
As b, a switching command for instructing switching according to the command value stored in the preset circuit 2 is output.

The selector switches 4a and 4b output either the output of the preset circuit 2 or the output of the control computer 3 in response to a switching command from the control computer 3. The selector switch 4a corresponds to the variable attenuators 5-1 to 5-N, and the selector switch 4b corresponds to the variable phase shifters 6-1 to 6-N, respectively.

The variable attenuators 5-1 to 5-N attenuate the transmission output from the power divider 1 according to the signal from the selector switch 4a. Variable phase shifters 6-1 to 6-N
Changes the phase of the transmission output input via the variable attenuators 5-1 to 5-N. The array antenna 7 includes a plurality of element antennas 7-1 to 7-N.

In the flying object data transmitting apparatus of the present invention,
Variable attenuators 5-1 to 5-N and variable phase shifters 6-1 to 6-N
The radiation pattern of the radio wave radiated from the array antenna 7 is determined by the adjustment amount of.

FIG. 2 is an explanatory diagram for the case of a general linear array for explaining the principle of the array antenna. FIG.
In the above, when N element antennas are arranged at equal intervals d on the Z axis, the radiation level E at point E in space is represented by the following equation.

[0017]

(Equation 1)

By adjusting the excitation amplitude (In) and the excitation phase (ψn) of each element antenna in the above equation (1), the intensity of a radio wave radiated into space, that is, the antenna pattern can be changed.

FIG. 3 shows an example of a state in which the array antenna 7 is mounted on a flying object. In FIG. 3, the array antenna 7 is arranged at the rear of the flying object. In this case, the antenna pattern is output behind the flying object.

In FIG. 3, φ indicates the interval between element antennas, and a indicates the radius of the array antenna 7 formed by the element antennas. The interval φ and the radius a are each determined by the transmission frequency and the size of the flying object. In addition,
FIG. 3 shows a case in which the array antenna 7 is arranged at the rear part of the flying object, but may be arranged around the body of the flying object, for example.

Next, the operation of the embodiment will be described.
The transmission output is controlled by the power divider 1 by the variable attenuator 5.
-1 to 5-N, the variable phase shifters 6-1 to 6-N, and the power supply system including the array antenna 7.

When a flying object is mounted on an aircraft or the like, or when it is separated from the aircraft or the like, the presence or absence of surrounding structures, the relative position with respect to the data receiver, the axis of the flying object are determined. The center direction is different. For this reason, if the radiation pattern from the array antenna 7 is one or a plurality of fixed ones, the influence of the multipath due to the surrounding structure or the cut of the radiation pattern due to the movement of the flying object causes the data receiver to fail. , The received power is reduced.

[0023] Therefore, when the flying body is mounted in an aircraft or the like, control computer 3 in accordance with the mounting / non-mounting data indicating this fact, the selector switches 4a, 4b
, A switching command for selecting the output from the preset circuit 2 is output.

That is, the variable attenuators 5-1 to 5-N and the variable phase shifters 6-1 to 6-N are set according to the set values stored in the preset circuit 2 in advance, and are mounted on an aircraft or the like. A time radiation pattern is radiated from the array antenna 7. Also, if the flying object is not mounted after being separated from the aircraft, etc.,

Based on the transmitter position / attitude angle and the receiver position, the control computer 3 sometimes determines the direction of the receiver with respect to the aircraft axis, that is, the relative angle with the receiver. Calculates every moment and outputs the operation result to the selector switch 4
a and 4b.

Further, the control computer 3 responds to loading / unloading data indicating that the flying object is not loaded,
A switching command for selecting an output from the control computer 3 is output to the selector switches 4a and 4b.

That is, the variable attenuators 5-1 to 5-N and the variable phase shifters 6-1 to 6-N are set according to the operation result obtained by the control computer 3, and the optimum values are set according to the direction of the receiver. The radiation pattern is radiated from the array antenna 7.

As described above, according to the set value stored in the preset circuit 2 or the result calculated by the control computer 3, the variable attenuators 5-1 to 5-N and the variable phase shifters 6-1 to 6-1 are used. By setting 6-N, the radiation pattern radiated from the array antenna 7 can be continuously changed.

In particular, when the flying object is separated from an aircraft or the like, the control
Since the relative angle with the receiver is calculated every moment based on the attitude angle and the receiver position, it is possible to stabilize the reception level at the receiver even if the relative position of the flying object to the receiver fluctuates sharply. it can.

[0030]

As described above, according to the present invention, when a flying object is mounted on an aircraft or the like, radio waves are radiated from an array antenna in a preset antenna pattern,
In the non-mounted state, the relative angle to the receiver is calculated every moment, and radio waves are radiated in that direction, so even if the relative position with the receiver changes drastically, stable reception at the receiver is possible. It is possible to gain a level.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a flying object data transmission device according to one embodiment of the present invention.

FIG. 2 is an explanatory diagram of a general linear array for explaining the principle of an array antenna.

FIG. 3 is a diagram showing an example of a state in which an array antenna 7 is attached to a flying object and arranged.

FIG. 4 is a block diagram showing a functional configuration of a conventional flying object data transmission device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Power divider, 2 ... Preset circuit, 3 ... Control computer, 4a, 4b ... Selector switch, 5-1 to 5-N
... variable attenuators, 6-1 to 6-N ... variable phase shifters, 7 ... array antennas.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) H04B 7/24-7/26 102 H04Q 7/00-7/38 H01Q 3/00-3/46 H01Q 21 / 00-21/30 H01Q 25/00-25/04

Claims (1)

(57) [Claims] 1. A flying object data transmitting device mounted on a flying object mountable on an aircraft or the like and radiating radio waves from an array antenna to a receiver, control calculation means for determining a relative angle with respect to the receiver. Preset means for setting the set value of the antenna pattern in the initial state, and, if not mounted on an aircraft or the like, the relative angle determined by the control calculation means , mounted on the aircraft or the like
On the basis of the set value set by the preset device, the A by adjusting the attenuation and the phase amount of the transmission output for each antenna element of the array antenna in the case where there
A flying object data transmitting device, comprising: adjusting means for changing a radiation pattern of a ray antenna .