KR20010087608A - A simulator of x-band communications satellite repeater - Google Patents

Abstract

The present invention is designed to design an active repeater equipped with an on-board processor and a conventional passive repeater as a single repeater, thereby presenting an environment for testing a communication satellite repeater in an actual X-band. A repeater design can be attempted, and the test apparatus for X-band communication satellite repeater can reduce the cost of using common parts by supporting active repeater and passive repeater simultaneously through one repeater. The test X-band communication satellite repeater designed to accommodate an active repeater and a passive repeater at the same time and designed as a repeater, and the test X-band by simulating an uplink signal to test the test X-band communication satellite repeater. Uplink signal generator for outputting a band communication satellite repeater, and the test X-band communication satellite In order to test the instrument is characterized in that it comprises a downlink signal generator for generating a downlink signal by inputting the signal output from the test X-band communication satellite repeater.

Description

Test apparatus for X-band communication satellite repeater {A SIMULATOR OF X-BAND COMMUNICATIONS SATELLITE REPEATER}

The present invention relates to a test apparatus for an X-band communication satellite repeater, and in particular, an active repeater equipped with an on-board processor (On-Board Processor) and a conventional passive repeater by designing a single repeater, the actual X-band The present invention relates to a test apparatus for an X-band communication satellite repeater to present an environment for testing a communication satellite repeater in a network.

In general, a satellite communication system that performs satellite communication using satellites includes a communication satellite repeater for relaying signals transmitted and received from the earth stations for smooth communication between earth stations.

Meanwhile, in designing the communication satellite repeater provided in the satellite communication system, the communication satellite repeater design was attempted by following the experience of designing the communication satellite repeater used in advanced satellite companies.

However, the method described above can only be tested by the method defined in the performance analysis and operation test of the communication satellite repeater, that is, the theoretical design method, and thus it is impossible to escape the design of the communication satellite repeater that is difficult to try various situations. There was a problem.

The present invention has been made to solve the above problems, the object of which is to design an active repeater equipped with an on-board processor and a conventional passive repeater as a single repeater communication satellite repeater in the actual X-band By presenting an environment to test the system, it is possible to design a communication satellite repeater in various situations, and by using a repeater simultaneously supporting an active repeater and a passive repeater, the parts are commonly used to reduce the cost. The present invention provides a test apparatus for an X-band communication satellite repeater.

1 is a block diagram of an uplink signal generator for testing an X-band communication satellite repeater according to the present invention;

2 is a block diagram of a downlink signal generator for testing an X-band communication satellite repeater according to the present invention;

3 is a block diagram of a test X-band communication satellite repeater according to the present invention;

4 is a bird's eye view of a test x-band communication satellite repeater according to the present invention;

<Description of the symbols for the main parts of the drawings>

11,17,21,27: Fixed attenuator 12,16,22,26: Coupler

13,14,23,24: variable attenuator 15,25: combiner

18,28: RF signal generator 31: input filter

32,35: switch 33: LNA

34,36,38,45,46,51,61,64,66,68,70: Isolator

37,52: D / C 39: IMUX

40, 54, 57, 58: divider 41: passive channel filter

42: active channel filter 43, 44, 62: SIT

47,65: channel AMP 48,50: AMP

49,63: variable attenuator 53: reference oscillator

55,56: LO oscillator 59: active processor

60: U / C 67: Combiner

69: SSPA

The test apparatus of the X-band communication satellite repeater of the present invention for achieving the above object is a test X-band communication satellite repeater designed to accommodate one active repeater and a passive repeater at the same time, and the test X-band communication An uplink signal generator for generating a simulated uplink signal for testing a satellite repeater and outputting it to the test X-band communication satellite repeater, and a test X-band communication satellite for testing the test X-band communication satellite repeater. And a downlink signal generator for simulating a downlink signal by inputting a signal output from the repeater.

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration and operation of the test apparatus of the X-band communication satellite repeater according to the present invention.

The test apparatus for the X-band communication satellite repeater according to the present invention includes a test X-band communication satellite repeater designed with an active repeater and a passive repeater as one repeater, and an uplink signal necessary for testing the X-band communication satellite repeater. It consists of uplink signal generator which simulates and downlink signal generator which simulates downlink signal by inputting and processing signals generated as a result of test operation of X-band communication satellite repeater.

1 is a block diagram of an uplink signal generator for testing an X-band communication satellite repeater according to the present invention. The fixed attenuator 11 inputs a channel signal of an earth station for testing to attenuate the level of the signal. And a variable attenuator 13 which inputs a signal passed through the fixed attenuator 11 and variably attenuates the signal level in 10 dB steps according to a control signal, and inputs and controls a signal passed through the variable attenuator 13. A variable attenuator 14 that attenuates the level of the signal in 1 dB steps according to the signal, and an interference signal, a jamming signal, and a load signal that are input to the signal passing through the variable attenuator 14; Combiner (15) for combining and outputting, a fixed attenuator (17) for inputting a signal passed through the combiner (15) to attenuate the level of the signal, and the fixed attenuator (11). Channel of earth station to output to Call signal, a control signal for outputting to the variable attenuators 13 and 14, an interference signal for outputting to the combiner 15, and an RF signal generator 18 for simulating a jamming signal.

A coupler for coupling the signal passing through the fixed attenuator 11 and the coupler 12 for confirming the signal and the signal passing through the combiner 15 for coupling the signal. 16 is configured to further include.

2 is a block diagram of an apparatus for generating a downlink signal for testing an X-band communication satellite repeater according to the present invention, in which the level of the signal is fixedly attenuated by inputting a PCM signal output from the test X-band communication satellite repeater. A fixed attenuator 21 and a variable attenuator 23 for inputting a signal passed through the fixed attenuator 21 to variably attenuate the signal level in 10 dB steps according to a control signal; A variable attenuator 24 which inputs a signal and variably attenuates the level of the signal in 1 dB steps according to a control signal, and outputs a combination of a signal passing through the variable attenuator 24, an input interference signal, a jamming signal, and a load signal. A combiner 25, a fixed attenuator 27 for inputting a signal passing through the combiner 25 to attenuate the level of the signal, and a control for outputting to the variable attenuators 23, 24. Signal, the combiner It consists of too RF signal generator 28 which generates an interference signal and the jamming signal for output to 25 to the simulation.

A coupler 26 for coupling the signal passed through the fixed attenuator 21 and the coupler 22 for confirming the signal and the signal passing through the combiner 25 to confirm the signal. It is configured to include more.

The uplink signal generator and the downlink signal generator configured as described above include a function for simulating the attenuation of the uplink and downlink, which can guarantee the attenuation range of 60 to 170dB, and the signal input and output to the repeater It makes a rough signal, that is, various conditions of the atmosphere, into a rough signal.

That is, the simulated signal generated by the uplink signal generator is used as an uplink signal necessary for the test operation of the test X-band communication satellite repeater according to the present invention, and the test operation result of the test X-band communication satellite repeater. The output signal is input to the downlink signal generator so that the test operation result and various states of the test X-band communication satellite repeater can be confirmed through the signal generated from the downlink signal generator.

3 is a block diagram of a test X-band communication satellite repeater according to the present invention. The input filter 31 inputs a PCM signal output from an uplink signal generator and passes only a signal of a desired band, and the input filter. A switch 32 for switching the signal passing through the signal 31, a low noise amplifier 33 for low noise amplifying the signal passing through the switch 32, and a signal amplified by the LNA 33; A down converter for frequency down-converting the switch 35 to switch once again and the signal of 7.9 to 8.4 GHz passing through the switch 35 to a signal of 7.25 to 7.75 GHz. 37, an input multiplexer 39 which separates the signal output from the D / C 37 for active relay processing and passive relay processing, and SITs 43 and 44 that attenuate to adjust the signal passing through the IMUX 39 to the desired level, A channel AMP 47 comprising two AMPs 48 and 50 with the side attenuator 49 interposed therebetween to ensure a variable range of channel power for manual relay processing for signals passing through the SIT 43; In order to perform active relay processing of the 7.25 to 7.75 GHz signals passing through the SIT 44, the D / C 52 converts the frequency down to a 70 MHz signal, and a reference frequency of 10 MHz generated by the reference oscillator 53. A divider (54) for distributing and outputting, a LO (LOcal) oscillator (55) for outputting a local frequency of 650 MHz to the D / C (37) using a reference frequency of 10 MHz output through the divider (54), LO oscillator 56 generating 7GHz local frequency and 470MHz local frequency using the 10MHz reference frequency output through the divider 54, and 470MHz local frequency of 7GHz output from the LO oscillator 56 The local frequency is equally distributed and output to the D / C 52 and U / C to be described later. An active processor 59 which converts a 70 MHz signal generated by the D / C 52 into a baseband signal, and modulates and demodulates the signal, and the active processor 59. Up-converter (up-converter) which up-converts the 70MHz signal output from the Hereinafter referred to as &quot; U / C &quot;, a SIT 62 that attenuates to adjust the signal output from the U / C 60 to a desired level, and a signal that has passed through the SIT 62; A variable attenuator 63 for attenuating the level of the signal variably, a channel AMP 65 for amplifying a signal passed through the variable attenuator 63, a signal obtained by a manual relay process passing through the channel AMP 47, and Combiner 67 for combining the signals by the active relay processing passing through the channel AMP 65 and Solid State Power Amplifier (SSPA) 69 for power amplifying the signal passing through the combiner 67. It is composed of

The IMUX 39 divides the signal output from the D / C 37 for the active relay process and the passive relay process, and a divider 40 and a signal separated from the divider 40. The passive channel filter 41 filters the channel signal for the passive relay process, and the active channel filter 42 filters the channel signal for the active relay process with respect to the signal separated by the divider 40.

An isolator 34 for preventing a backflow of the low noise amplified signal in the LNA 33 and an isolator 36 for preventing a backflow of the signal passing through the switch 35; An isolator 38 for preventing a backflow to the signal output from the D / C 37, an isolator 45 and 46 for preventing a backflow to the signal passing through the SITs 43 and 44, An isolator 51 for preventing backflow of the signal amplified by the AMP 50 in the channel AMP 47 and an isolator 61 for preventing backflow of the signal output from the U / C 60. And an isolator 64 for preventing backflow of the signal attenuated by the variable attenuator 63, an isolator 66 for preventing backflow of the signal amplified in the channel AMP 65, and the comb. To prevent backflow to the combined signal at the biner 67 Isolator 68, and isolator 70 for preventing the backflow of the signal amplified by the SSPA 69 is further included.

In the test X-band communication satellite repeater configured as described above, the variable attenuators 49 and 63 are installed to support various operating power ranges, and the input filter 31, the LNA 33, and the D / C ( 37) is designed to be shared between the active repeater and the passive repeater, and is designed such that the active repeater and the passive repeater are separated through the IMUX 39.

Active repeaters provide 70MHz input and output ports for on-board processors, and are designed so that D / C (52) and U / C (60) share the same LO oscillator (56). .

In order to increase the frequency stability of the LO oscillator 56, a reference oscillator 53 generating a reference frequency of 10 MHz is designed to use a signal of a master oscillator to simulate the effect of using a GPS receiver. Do it.

By allowing the variable range of active repeater channel power to 80dB, it is possible to fully support the test for setting the desired operating range, and the passive repeater uses a two-stage channel amplifier with a variable attenuator in between. Like an active repeater, it ensures a variable range of 80dB.

In the test X-band communication satellite repeater configured as described above, the test coupler is inserted into a desired position, that is, as shown in FIG. 3, so that the current signal level as well as the state of the signal can be confirmed.

4 is a bird's eye view of a test X-band communication satellite repeater according to the present invention.

The test X-band communication satellite repeater is designed to be suitable for variable electrical performance test, so that the performance analysis and specification of each component can be tested before the actual satellite repeater is designed.

That is, various situations that occur during the operation of the communication satellite repeater such as analyzing the performance of the active repeater as well as the passive repeater and examining the state of each component while varying the channel power for the channel signal generated by the uplink signal generator. To test the communication satellite repeater.

As described above, the present invention, the actual X-band through the up and down link signal generator for simulating the test X-band communication satellite repeater and the up and down link signal designed active relay and passive repeater as one repeater By presenting the environment to test the communication satellite repeater in the system, it is possible to try the design of the communication satellite repeater in various situations by analyzing the performance and testing the specifications of each component before the actual design of the communication satellite repeater. There is an effect of being able to design with sufficient consideration.

In addition, the active repeater and the passive repeater are simultaneously supported by one repeater, so that the cost of the satellite communication repeater can be reduced due to the weight reduction of the communication satellite repeater by using the components in common.

Claims (9)

A test X-band communication satellite repeater designed to accommodate an active repeater and a passive repeater at the same time, and an uplink signal to simulate the test X-band communication satellite repeater to simulate the test X-band communication. Uplink signal generator for outputting to a satellite repeater and a downlink signal generated by simulating a downlink signal by inputting a signal output from a test X-band communication satellite repeater to test the test X-band communication satellite repeater Apparatus for testing an X-band communication satellite repeater comprising a device. According to claim 1, The uplink signal generator, An attenuator which attenuates the level of the channel signal of the simulated earth station input through the fixed attenuator, and then variably attenuates the signal signal through the attenuator in 10 dB steps and 1 dB steps according to the control signal through the variable attenuator; A combiner for outputting a combination of a signal, a jamming signal, and a load signal, a fixed attenuator for inputting a signal passed through the combiner to attenuate the level of the signal, a channel signal of an earth station for outputting the fixed attenuator, and And a control signal for outputting to a variable attenuator, an interference signal for outputting to the combiner, and an RF signal generator for simulating a jamming signal. According to claim 2, The uplink signal generator, And a coupler for checking a signal at the front end of the variable attenuator and the rear end of the combiner. According to claim 1, The test X-band communication satellite repeater, Inputs the PCM signal output from the uplink signal generator and passes only a signal of a desired band, and then a low noise amplification input filter and LNA, and the 7.9 ~ 8.4GHz signal amplified by the input filter and LNA 7.25 ~ 7.75GHz A first D / C for frequency down-conversion to a signal, an IMUX for separating the signal output from the first D / C for active relay processing and passive relay processing, and a signal passing through the IMUX to a desired level A first channel AMP configured to ensure a variable range of channel power for manual relay processing for a signal passing through the SIT, and a SIT that is attenuated in order to provide a variable attenuator. 650 MHz local using a second D / C frequency downconverted to a 70 MHz signal for active relaying of the 7.25 to 7.75 GHz signal and a 10 MHz reference frequency distributed through the divider An LO oscillator for outputting a wave number to the first D / C, an LO oscillator for generating a local frequency of 7 GHz and a 470 MHz local frequency using a 10 MHz reference frequency distributed through a divider, and an output from the LO oscillator A divider for dividing a local frequency of 7 GHz and a local frequency of 470 MHz to output the second D / C and the U / C, and converting a 70 MHz signal generated in the second D / C into a baseband signal and performing a modulated demodulation signal. An active processor for processing, a U / C for up-converting a 70 MHz signal output from the active processor to a signal of 7.25 to 7.75 GHz, and an SIT attenuating to adjust the signal output from the U / C to a desired level And a variable attenuator and a second channel AMP for variably attenuating and then amplifying the level of the signal passing through the SIT, and a signal and a variable attenuation by a manual relay process passing through the first channel AMP. A combiner for combining signals by an active relay process that has passed through the second and second channel AMPs, and an SSPA for amplifying the combined signals in the combiner; Device. The method of claim 4, wherein the IMUX of the test X-band communication satellite repeater, A divider for separating the signal output from the first D / C for active relay processing and passive relay processing, a passive channel filter for filtering a channel signal for passive relay processing on the signal separated from the divider; Test device for an X-band communication satellite repeater comprising an active channel filter for filtering the channel signal for active relay processing for the signal separated from the divider. According to claim 4, The test X-band communication satellite repeater, And a test coupler for checking the current signal level and status of the test X-band communication satellite repeater at each component block position. According to claim 4, The test X-band communication satellite repeater, A test apparatus for an X-band communication satellite repeater further comprises a plurality of isolators to prevent backflow of signals in each component block. According to claim 1, The downlink signal generator, An attenuator for attenuating the PCM signal of the test X-band communication satellite repeater input through the fixed attenuator and then attenuating the attenuator in 10 dB steps and 1 dB steps according to a control signal through a variable attenuator; And a combiner for outputting a combination of an interference signal, jamming signal, and a load signal, a fixed attenuator for inputting a signal passing through the combiner to attenuate the level of the signal, and a control signal for outputting the variable attenuator. And an RF signal generator for simulating an interference signal and a jamming signal for outputting to the combiner. The method of claim 8, wherein the downlink signal generator, And a coupler for checking a signal at the front end of the variable attenuator and the rear end of the combiner.