KR19990049439A - Rainfall detection control device of radio call data satellite transmission system - Google Patents

Abstract

The present invention is to prevent the excess of the correction limit of the uplink power control device due to the malfunction of the beacon receiver and to prevent the central station from switching due to this, the present invention is to transmit the intermediate frequency signal level from the rainfall detection unit in the uplink power control unit Control according to the level of DC voltage, the beacon receiver receives the beacon signal from the antenna and outputs a DC voltage proportional to the signal level, if the rain gauge outputs the rainfall information as an analog signal, the rain detector detects the DC voltage from the beacon receiver After receiving the rainfall data from the rain gauge and detecting rain or not, the output of the beacon receiver is transferred to the uplink power control unit or transferred, and the beacon signal transmitted from satellite or the beacon receiver itself is unstable and outputs regardless of the rainfall. Uplink power control device when voltage drops It exceeds the correction limit and will be able to prevent the central station the transfer function to enhance the reliability and stability of the overall system operations.

Description

Rainfall detection control device of radio call data satellite transmission system

The present invention relates to a rainfall detection control apparatus of a radio call data satellite transmission system, and more particularly, to prevent the exceeding of the correction limit of the uplink power control apparatus due to a malfunction of a beacon receiver and to prevent the central station from switching. The present invention relates to a device for improving stability and reliability.

In general, a radio call data satellite transmission system is a system for transmitting radio call data through a satellite, and is a one-way data transmission system in which a path between base stations is replaced by a link using a satellite in a conventional leased line in a TDX-PS.

The general radio call data satellite transmission system is composed of a main-preliminary central station and a terminal station, and usually transmits radio waves carrying radio call data from the main central station to the terminal station through a satellite. Then, the beacon receiver of the central station converts the power level of the beacon signal transmitted from the satellite into a DC voltage and transmits it to the uplink power control device. The uplink power control device attenuates the beacon signal between the satellite and the central station through this DC voltage. To determine the degree, control the uplink power level, and if the location of the central station is significantly lowered due to rainfall, the beacon signal level is significantly lowered. do.

1 is a block diagram of a conventional radio call data satellite transmission system.

As shown therein, a modulator 1 which receives radio call data to be transmitted to a satellite and modulates it into an intermediate frequency (IF) signal; An uplink power controller (2) for controlling the intermediate frequency signal level input from the modulator (1) according to the level of the DC voltage transmitted from the beacon receiver (5); A power amplifier 3 for converting the intermediate frequency signal output from the uplink power controller 2 into a radio frequency (RF) signal and then amplifying the intermediate frequency signal to a predetermined level; An antenna (4) for transmitting a high frequency signal output from the power amplifier (3) to a satellite and receiving a beacon signal from the satellite; Beacon receiving unit 5 receives the beacon signal from the antenna 4 and outputs a DC voltage proportional to the signal level.

The operation of the conventional radio call data satellite transmission system configured as described above will be described in detail with reference to the accompanying drawings.

First, the modulator 1 receives radio call data transmitted to a satellite and modulates the signal into an intermediate frequency signal of 70 MHz. The uplink power controller 2 measures the propagation attenuation of the transmission section between the satellites through the DC voltage output from the beacon receiver 5, and when a DC voltage smaller than the initial input level is inputted, the modulator 1 The uplink power level is corrected to amplify the input intermediate frequency signal.

If an alarm occurs in the beacon receiver 5, the DC voltage output from the beacon receiver 5 is unreliable, and the uplink power controller 2 outputs an intermediate frequency signal at an initial level. The correction limit of the uplink power control unit 2 is 15 dB, and when the limit is exceeded, the function of the center station is transferred to the reserve center station.

However, in the conventional apparatus, when the beacon receiver does not generate any alarm and the output voltage drops due to temporary malfunction or instability of the beacon signal, the uplink power controller receives the beacon signal due to the output voltage drop of the beacon receiver. It is not possible to determine whether the level has been attenuated or caused by a temporary malfunction of the beacon receiver. Therefore, if the output voltage of the beacon receiving unit drops to an extent exceeding the correction limit of the uplink power control unit, the central station function may be switched to the preliminary center station, and thus, the stability of the entire system operation may be deteriorated.

Accordingly, the present invention has been proposed to solve the conventional problems as described above, and an object of the present invention is to prevent the excess of the correction limit of the uplink power control device due to the malfunction of the beacon receiver and to prevent the switching of the central station due to the wireless call. The present invention provides a rainfall detection control apparatus for a radio calling data satellite transmission system that can improve the stability and reliability of a data satellite transmission system.

In order to achieve the above object, the rainfall detection control apparatus of the radio call data satellite transmission system according to the present invention,

An uplink power control unit controlling the intermediate frequency signal level input from the modulator according to the level of the DC voltage transmitted from the rainfall detector; A beacon receiver for receiving a beacon signal from the antenna and outputting a DC voltage proportional to the signal level; A rain gauge for outputting rainfall information as an analog signal; The technical configuration is characterized by consisting of a rain detection unit for receiving a DC voltage from the beacon receiving unit and receiving rainfall data from the rain gauge to detect whether the rain or the like to transmit or transfer the output of the beacon receiving unit to the uplink power control unit.

1 is a block diagram of a conventional radio call data satellite transmission system;

2 is a block diagram of a rainfall detection control apparatus for a wireless paging data satellite transmission system according to the present invention;

3 is a detailed block diagram of the rainfall detection unit in FIG.

<Explanation of symbols for main parts of the drawings>

10: modulator 20: uplink power control unit

30: power amplifier 40: antenna

50: beacon receiving unit 60: rain gauge

70: rainfall detection unit 71: rainfall detection control unit

72: comparison unit 77: rainfall counter unit

74: level shifter 75: counter

76: processor 77: logical operation unit

78: switch

Hereinafter, an embodiment according to the technical concept of the rainfall detection control apparatus of the present invention, the wireless call data satellite transmission system configured as described above will be described in detail.

Figure 2 is a block diagram of a rainfall detection control device of a radio call data satellite transmission system according to the present invention.

As shown therein, a modulator 10 which receives radio call data to be transmitted to a satellite and modulates it into an intermediate frequency (IF) signal; An uplink power controller 20 for controlling the intermediate frequency signal level input from the modulator 10 according to the level of the DC voltage transmitted from the rainfall detector 70; A power amplifier 30 for converting the intermediate frequency signal output from the uplink power controller 20 into a radio frequency (RF) signal and then amplifying the intermediate frequency signal to a predetermined level; An antenna 40 for transmitting a high frequency signal output from the power amplifier 30 to a satellite and receiving a beacon signal from the satellite; A beacon receiver 50 which receives a beacon signal from the antenna 40 and outputs a DC voltage proportional to a signal level; A rain gauge 60 for outputting rainfall information as an analog signal; The rain detection unit for receiving a DC voltage from the beacon receiver and receiving rainfall data from the rain gauge 60 to detect whether it is rainy or not, and transmits or transfers the output of the beacon receiver 50 to the uplink power controller 20. 70).

3 is a detailed block diagram of the rainfall detection unit in FIG.

As shown in this figure, the rain detection controller 71 receives a DC voltage from the beacon receiving unit 50 and receives rainfall data from the rain gauge 60 to determine whether the rainfall is rain and output a switching control signal; The switch 78 transmits the output of the beacon receiver 50 to the uplink power controller 20 or transfers the beacon receiver 50 according to the switching control signal of the rainfall detection controller 71.

The rainfall detection control unit 71 includes: a comparison unit 72 for comparing the DC voltage input from the beacon receiving unit 50 with the REF voltage and outputting a comparison result; A rainfall counter unit 73 for counting rainfall data output from the rain gauge 70; A processor (76) for determining whether a value input from the rainfall counter unit (73) is a predetermined amount or more of rainfall; And a logic summation unit 77 for performing a logical sum operation on the signal input from the comparator 72 and the processor 76 and outputting a result value.

In this case, the comparator 72 outputs a high signal when the input voltage of the beacon receiver 50 is greater than or equal to the REF voltage, and outputs a low signal when the input voltage of the beacon receiver 50 is smaller than the REF voltage. It features.

The rain counter unit 73 includes: a level shifter 74 for converting an analog pulse signal level output by the rain gauge 70 installed outdoors according to rainfall into a TTL (Transistor Transistor Logic) level; The counter 75 includes a counter 75 that counts the number of pulse signals output from the level shifter 74, converts the number of pulse signals into binarization information, and transfers the same to the processor 76.

The processor 76 outputs a high signal when it is determined that the binary number inputted from the rainfall counter unit 73 is larger than a binary number that can be initially determined to be a certain amount of rainfall or more, and the input binary number is initially a predetermined amount. If less than the binary number that can be determined as the rain is characterized in that for outputting a low signal.

The switch 78 outputs the DC voltage input from the beacon receiving unit 50 when the voltage output from the rainfall detection control unit 71 is high, and the voltage output from the rainfall detection control unit 71 is low. When the beacon receiving unit 50 in the clear weather it is characterized in that output the same level as the DC voltage output during normal operation.

Referring to the accompanying drawings, the operation of the rainfall detection control apparatus of the radio call data satellite transmission system according to the present invention configured as described above is as follows.

First, the modulator 10 receives radio call data to be transmitted to a satellite and modulates the signal into an intermediate frequency signal of 70 MHz. The uplink power controller 20 controls the intermediate frequency signal level input from the modulator 10 according to the level of the DC voltage transmitted from the rainfall detector 70.

The power amplifier 30 converts the intermediate frequency signal output from the uplink power controller 20 into a high frequency signal and then amplifies the signal to a predetermined level, and the antenna 40 outputs the high frequency signal output from the power amplifier 30. It transmits to the satellite and receives the beacon signal from the satellite to be transmitted to the beacon receiving unit (50). Then, the beacon receiver 50 receives the beacon signal from the antenna, converts it into a DC voltage that is at this signal level, and transmits it to the rainfall detecting unit 70. In addition, the rain gauge 60 installed outdoors measures the rainfall, converts it into a signal in the form of a pulse and transmits it to the rainfall detecting unit 70.

Thus, the rainfall detecting unit 70 receives a DC voltage from the beacon receiving unit 50 and receives rainfall information from the rain gauge 60. When the voltage output by the beacon receiver 50 is greater than or equal to a predetermined level, the output voltage of the beacon receiver 50 is transmitted to the uplink power controller 20 as it is. Here, the constant level means a voltage level such that the uplink power control unit 20 does not reach the correction limit.

If the voltage output from the beacon receiver 50 is less than a predetermined level, to check whether it is due to real rainfall, the rain voltage is compared with the rainfall information transmitted from the rain gauge 60, and if it is raining, the output voltage of the beacon receiver 50 is increased. If it is transmitted to the link power control unit 20 and there is no rain, it outputs the initially set DC voltage (the same level as the DC voltage output in the normal operation of the beacon receiving unit 50 in sunny weather).

Looking at the operation in such a rain detection unit 70 in more detail as follows.

First, the comparator 72 outputs 5V (TTL level) when the DC voltage input from the beacon receiver 50 is greater than or equal to the REF voltage, and outputs a 0V (TTL level) signal when the input voltage is less than the REF voltage. The level shifter 74 converts the analog pulse signal level output by the rain gauge 60 installed outdoors according to the rainfall to a TTL level. In addition, the counter 75 counts the number of pulse signals converted to the TTL level, converts them into binarization information, and transfers them to the processor 76.

Thus, the processor 76 outputs 5V (TTL level) if the binary number inputted from the counter 75 is earlier than a binary number which may be determined to be a certain amount of rainfall at first, that is, if it is raining, otherwise 0V (TTL level). ) Will be printed.

The logical sum calculating section 77 then performs a logical sum operation on the TTL level signals input from the comparator 72 and the processor 76, and outputs the result value at the TTL level. Accordingly, the analog switch 78 outputs the DC voltage input from the beacon receiver 50 when the voltage output from the logic calculator 77 is 5V, and defaults when the voltage output from the logic calculator 77 is 0V. It outputs a voltage (in the sunny weather, the same level as the DC voltage that the beacon receiver 50 outputs in normal operation).

This operation is shown in Table 1 by dividing the output signal of the switch 78 according to the input signal of the logic operation unit 77.

Rainfall Detection Unit Comparator Output Processor output Logic Operator Output Switch output low low Low (0V) REF voltage low Hi High (5V) Beacon receiver output voltage Hi low High (5V) Beacon receiver output voltage Hi Hi High (5V) Beacon receiver output voltage

As described above, the present invention contributes to the stability of the entire system by implementing a rain detection device in order to prevent the beacon receiver from dropping the output voltage irrespective of rainfall, so that the uplink power controller exceeds the correction limit and transfers the central station function. Will be done.

As described above, the rain detection control apparatus of the radio call data satellite transmission system according to the present invention installs a rain gauge outdoors in the central station of the radio call data satellite transmission system having a site diversity structure and detects rainfall indoors. By implementing the control device, if the beacon receiver itself or the beacon signal transmitted from the satellite is unstable, and the output voltage drops regardless of the rainfall, the uplink power control device prevents the switching of the central station function beyond the correction limit. As a result, the reliability and stability of the overall system operation method can be improved.

Claims (7)

In the radio call data satellite transmission system for transmitting radio call data through a satellite, An uplink power control unit controlling the intermediate frequency signal level input from the modulator according to the level of the DC voltage transmitted from the rainfall detector; A beacon receiver for receiving a beacon signal from the antenna and outputting a DC voltage proportional to the signal level; A rain gauge for outputting rainfall information as an analog signal; Wireless call data satellite transmission comprising a rain detection unit for receiving a DC voltage from the beacon receiver and receiving rainfall data from the rain gauge to detect whether it is rainy or not to transmit or transfer the output of the beacon receiver to the uplink power controller. Rainfall detection control system of the system. The method of claim 1, wherein the rainfall detection unit, A rain detection controller for receiving a DC voltage from a beacon receiver and receiving rainfall data from a rain gauge to determine whether rainfall is detected and outputting a switching control signal; And a switch configured to transfer an output of the beacon receiver to an uplink power controller or switch the beacon receiver according to a switching control signal of the rainfall detection controller. The method of claim 2, wherein the rainfall detection control unit, A comparator for comparing the DC voltage input from the beacon receiver with a REF voltage and outputting a comparison result; A rainfall counter unit for counting rainfall data output from the rain gauge; A processor for determining whether a value input from the rainfall counter unit is a predetermined amount or more of rainfall; Rainfall control device of a radio call data satellite transmission system, characterized in that it comprises a logical sum operation unit for performing a logical sum operation of the signal input from the comparison unit and the processor and outputs the result value. The method of claim 3, wherein the comparison unit, And a low signal is output when the input voltage of the beacon receiver is greater than or equal to the REF voltage, and a low signal is output when the input voltage of the beacon receiver is less than the REF voltage. The method of claim 3, wherein the rainfall counter unit, A level shifter for converting the analog pulse signal level output by the rain gauge installed in the outdoors according to the rainfall into a TTL level; And a counter for counting the number of pulse signals output from the level shifter, converting the number of pulse signals into binarization information, and transmitting the result to the processor. The processor of claim 3, wherein the processor comprises: If the binary number inputted from the rainfall counter unit is larger than the binary number that can be initially determined to be a certain amount of rainfall, and outputs a high signal, and the input binary number is smaller than the binary number that can be initially determined to be a certain amount of rainfall. Rain detection control device of a radio call data satellite transmission system, characterized in that for outputting a low signal. The method of claim 2, wherein the switch, If the voltage output from the rainfall detection controller is high, output the DC voltage input from the beacon receiver; if the voltage output from the rainfall detection controller is low, the same level as the DC voltage output during normal operation in a clear weather Rainfall detection control device of a radio call data satellite transmission system, characterized in that for outputting.