JP2546065Y2 - Antenna receiver - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a receiver for receiving a telemetry signal by switching between two antennas.

[0002]

2. Description of the Related Art FIG. 2 is a block diagram showing a configuration of a receiving facility used for receiving a telemetry signal from artificial hygiene or a rocket.

This receiving equipment has two types of antennas, an antenna 1 and an antenna 2, and switches a signal received from one of the antennas 1 or 2 by a switch 4 and supplies it to a receiver 3. In addition, an AGC voltage is output from the receiving device 3 for displaying a reception input level, and this is displayed on the meter 5.

[0004]

However, the display of the reception input level in the above-mentioned conventional reception equipment is performed by the AG corresponding to the reception input level output from the reception device 3.
The C voltage is applied to the meter 5 to perform the measurement. Therefore, when the operation mode is switched from the antenna 2 to the antenna 1,
The reception input level input to the reception device 3 increases, and accordingly, the AGC voltage increases and the display of the meter 5 changes. Therefore, the conventional receiving equipment has a drawback that only the reception input level of the currently selected antenna can be displayed as the reception input level.

The present invention has been made in view of the above-mentioned problems, and provides an antenna receiving apparatus capable of simultaneously displaying a reception input level in each antenna when two antennas and one receiver are provided. The purpose is to do.

[0006]

An antenna receiving apparatus according to the present invention has two antennas, a receiving device for receiving and demodulating a received signal, and a first device for selectively switching and connecting the antenna and the receiving device. A switch, a reference voltage generator for generating a reference voltage corresponding to a gain difference between the two antennas, an adder for adding the reference voltage signal and a reception level signal from the receiver, and the reference voltage signal. A subtractor for obtaining a difference between the signal and the reception level signal; two meters for displaying output signals of the adder and the subtractor; and providing the reference voltage signal to the adder in conjunction with the first switch. And a second switch for selecting whether to supply the signal to the subtractor.

In this case, the antenna and the arithmetic unit (adder or subtractor) may be configured to have three or more plural units.

[0008]

In the present invention, if the first antenna is of a long-distance receiving type having a narrow beam width and the other second antenna is of a short-distance receiving type having a wide beam width, the reference voltage generator is A reference voltage corresponding to the gain difference of the antenna is generated. Then, when receiving a signal from a long distance, the first and second switches input the signal received by the first antenna to the receiving device, and add the reception level signal demodulated by the receiving device as it is to the adder. , And the subtractor receives the reference voltage signal of the reference voltage generator, and subtracts the reference voltage signal from the reception level signal to display the result on the second meter. As a result, in one receiver, the first meter reads the measured value and the second meter
Can simultaneously display the calculated values. In the case of a long distance, they are connected in reverse, the first meter displays the calculated value to which the reference voltage has been added by the adder, and the second meter displays the actually measured value.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a block diagram showing an antenna receiving apparatus according to an embodiment of the present invention, and the same parts as those in the conventional block diagram shown in FIG.

The antennas 1 and 2 use different antenna beam widths from each other. The antenna 1 uses a narrow antenna beam width, and the antenna 2 uses a wide antenna beam width. As a result, the antenna 1 can have a larger antenna gain than the antenna 2 and can receive fine telemetry signals from a long distance. However, when receiving a telemetry signal from a short distance through the antenna 1, the reception signal becomes a strong signal reception level, the receiving device 3 becomes saturated, and a good reception state cannot be maintained. For this reason, conventionally, in the case of a short distance, the antenna 2
Had to use. Therefore, conventionally, for example, when performing telemetry reception from a rocket, since the direct distance greatly changes from a short distance to a long distance, an antenna 2 of a type having a wide antenna beam width and a low antenna gain is used at first, and a direct distance is used. When the number of antennas increases, the antenna is switched to an antenna 1 of a type having a narrow antenna beam width and a high antenna gain for operation. Further, in this case, in operation at a short distance, since the antenna beam used is wide, it can be maintained even if the center of the antenna beam deviates from the target.

The received signals of the antennas 1 and 2 are given to the receiving device 3 via the switch 4. The switch 4 selectively supplies the reception signals of the antennas 1 and 2 to the reception device 3. The AGC voltage output from the receiving device 3 is input to the adder 7 and the subtractor 8, and the outputs of the adder 7 and the subtractor 8 are displayed on the meters 5 and 6, respectively. The voltage generator 10 generates a reference voltage (correction value) corresponding to the AGC voltage corresponding to the gain difference between the antenna 1 and the antenna 2. The switch 9 selectively supplies the reference voltage output from the voltage generator 10 to the adder 7 and the subtractor 8. In this case, the switch 9 works in conjunction with the switch 4. That is, when the switch 4 selects the antenna 1, the switch 9
Selects the subtractor 8, and when the switch 4 selects the antenna 2, the switch 9 selects the adder 7.

In the receiving equipment configured as described above, when the switch 4 selects the antenna 1, the receiving equipment 3
Is the voltage in charge of the reception input level in the antenna 1. At this time, the switch 9 is connected to the subtractor 8 side, and the reference voltage from the voltage generator 10 is applied to the subtractor 8.

The AGC voltage from the receiving device 3 is applied to the adder 7 and the subtractor 8. Since the reference voltage from the voltage generator 10 is not applied to the adder 7, the AGC voltage from the receiving device 3 is directly applied to the meter 5, and the meter 5 displays the reception input level received by the antenna 1. I do. The reference voltage from the voltage generator 10 is added to the subtractor 8, and the reference voltage provided from the voltage generator 10 is subtracted from the AGC voltage input from the receiving device 3, and the calculation result is obtained. It is displayed on the meter 6. That is, since the correction value corresponding to the gain difference between the antenna 1 and the antenna 2 is subtracted from the reception input level received at the antenna 1 in the meter 6, the meter 6 is equivalent to the reception input level received at the antenna 2. Display level.

Conversely, when the switch 4 selects the antenna 2, the AGC voltage from the receiving device 3 is the voltage for the reception input level in the antenna 2. At this time, switch 9
Is connected to the adder side, and the reference voltage from the voltage generator 10 is applied to the adder 7. Then, the reference voltage from the voltage generator 10 is added to the adder 7, and the AGC voltage from the receiving device 3 and the reference voltage from the voltage generator 10 are added and added to the meter 5. That is, the meter 5 adds the correction value corresponding to the gain difference between the antenna 1 and the antenna 2 to the reception input level received at the antenna 2, so that the reception input level received at the antenna 1 is equivalently calculated. indicate. Since the reference voltage from the voltage generator 10 is not applied to the subtracter 8, the AGC
The voltage is applied to the meter 6 as it is, and the meter 6 indicates the reception input level received at the antenna 2.

As described above, the meter 5 displays the reception input level received at the antenna 1 and the meter 6 displays the reception input level received at the antenna 2.

The present invention can be applied not only to two antennas as in the above embodiment but also to three or more antennas. In this case, arithmetic units and meters for adding or subtracting may be provided according to the number of antennas.

[0018]

As described above, according to the present invention, the reception input levels of two antennas are simultaneously displayed (one is an actually measured value and the other is a calculated value) despite the fact that there is only one receiver. This makes it possible to easily determine the switching timing of the two antennas. Moreover, the number of receiving devices is two.
Since no table is required, the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an antenna receiving apparatus according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a conventional receiving facility.

[Explanation of symbols]

 Antenna 3; Receiving device 4, 9; Switch 5, 6; Meter 7; Adder 8; Subtractor 10; Voltage generator

Claims (2)

(57) [Scope of request for utility model registration] 1. An antenna, a receiving device for receiving and demodulating a received signal, a first switch for selectively switching and connecting the antenna and the receiving device, and a gain corresponding to a gain difference between the two antennas. A reference voltage generator that generates a reference voltage, an adder that adds the reference voltage signal and a reception level signal from the receiving device, and a subtractor that calculates a difference between the reference voltage signal and the reception level signal. Two meters for displaying output signals of the adder and the subtractor, and a second for selecting whether to provide the reference voltage signal to the adder or the subtractor in conjunction with the first switch. An antenna receiving device comprising a switch. 2. A plurality of antennas, a receiving device for receiving and demodulating a received signal, a first switch for selectively switching and connecting the antenna and the receiving device, and a gain difference between the antennas. A reference voltage generator that generates a plurality of corresponding reference voltages, a plurality of calculators that are provided corresponding to the number of antennas and that calculate the reference voltage signal and a reception level signal from the receiving device; It has a plurality of meters for displaying an output signal of a computing unit, and a second switch for selectively supplying the plurality of reference voltage signals to the computing unit in conjunction with the first switch. Antenna receiver.