Satellite terminal performance measuring apparatus and method

Abstract

The present invention provides a method for measuring the transmission performance of a satellite terminal, comprising: a process of receiving a first signal transmitted by the satellite terminal and measuring a first intensity value; a process of receiving a second signal transmitted by a reference antenna unit whose transmission performance has been previously verified and measuring a second intensity value; and a process of calculating the transmission performance of the satellite terminal based on the transmission performance of the reference antenna unit according to the difference between the first intensity value and the second intensity value; and the method can easily measure the transmission performance of the satellite terminal.

Description

Technology Field

[0001] The present invention relates to a satellite terminal performance test apparatus and test method, and more specifically, to a satellite terminal performance measurement method and measurement apparatus capable of easily measuring the transmission performance of a satellite terminal (e.g., Effective Isotropic Radiated Power (EIRP)). Background Technology

[0002] Generally, a satellite communication system includes a satellite moving along a preset orbit and multiple satellite terminals deployed on the ground. When any one of the multiple satellite terminals transmits a signal, it can be transmitted to other satellite terminals via the satellite.

[0003] At this time, since the signal transmission performance of a satellite terminal can affect communication quality, it is necessary to measure the transmission performance of the satellite terminal to test whether it is suitable for use in satellite communication. Conventionally, the antenna and High Power Amplifier (HPA) equipped in the satellite terminal were separated to measure their respective performances, and the transmission performance of the satellite terminal was verified by combining the measurement results.

[0004] However, there is a problem in that the process of measuring satellite terminal performance becomes complicated because the antenna and high-power amplifier must be separated and measured separately whenever the transmission performance of the satellite terminal is verified. Additionally, if the antenna is an electronic beam steering antenna, there is a problem in that the transmission performance of the satellite terminal cannot be verified because the antenna and the high-power amplifier cannot be structurally separated. Prior art literature

[0005] (Patent Document 0001) KR 10-2852383 B The problem to be solved

[0006] The present invention provides a method for measuring satellite terminal performance and a measuring device capable of measuring transmission performance without separating the components of the satellite terminal.

[0007] The present invention provides a method for measuring satellite terminal performance and a measuring device that can simplify the task of measuring the transmission performance of a satellite terminal. means of solving the problem

[0008] The present invention provides a method for measuring the transmission performance of a satellite terminal, comprising: a process of receiving a first signal transmitted by the satellite terminal and measuring a first intensity value; a process of receiving a second signal transmitted by a reference antenna unit whose transmission performance has been previously verified and measuring a second intensity value; and a process of calculating the transmission performance of the satellite terminal based on the transmission performance of the reference antenna unit according to the difference between the first intensity value and the second intensity value.

[0009] The process of measuring the first intensity value includes: a process of controlling the satellite terminal to amplify the first signal to a maximum intensity and transmit it; and a process of receiving the first signal and verifying the first intensity value when the satellite terminal transmits the first signal at the maximum intensity.

[0010] The process of controlling the transmission of the first signal by amplifying it to the maximum strength comprises: a process of generating the first signal; a process of amplifying the first signal until its strength reaches a limit value; and a process of calculating the limit value as the maximum strength.

[0011] The process of measuring the first intensity value includes receiving the first signal at a location spaced apart from the satellite terminal by a preset distance and verifying the first intensity value, and the process of measuring the second intensity value includes receiving the second signal at a location spaced apart from the reference antenna unit by the same distance as the preset distance and verifying the second intensity value.

[0012] The above transmission performance includes effective isotropic radiative power.

[0013] The transmission gain of the reference antenna section and the loss occurring in the cable provided in the reference antenna section are measured in advance, and the effective isotropic radiated power of the reference antenna section is calculated by the following formula (1).

[0014] Formula (1): EIRP ref = S + L + G

[0015] (Here, EIRP ref is the effective isotropic radiated power of the reference antenna section, S is the intensity of the second signal generated, L is the loss occurring in the cable, and G is the transmit gain of the reference antenna section)

[0016] The process of calculating the transmission performance of the above satellite terminal uses the following formula (2).

[0017] Formula (2): EIRP t = EIRP ref + (P1- P2)

[0018] (Here, EIRP t is the effective isotropic radiative power of the satellite terminal, P1 is the first intensity value, and P2 is the second intensity value)

[0019] The present invention relates to a satellite terminal performance measuring device for measuring the transmission performance of a satellite terminal, comprising: a reference antenna unit in which the transmission performance is pre-confirmed; a measuring unit for measuring, respectively, a first intensity value of a first signal transmitted by the satellite terminal and a second intensity value of a second signal transmitted by the reference antenna unit; and a calculation unit for calculating the transmission performance of the satellite terminal based on the transmission performance of the reference antenna unit according to the difference between the first intensity value and the second intensity value.

[0020] The above measuring unit is installed to be movable between a first position that can be spaced apart from and facing the satellite terminal, and a second position that can be spaced apart from and facing the reference antenna unit.

[0021] The distance between the satellite terminal and the first position, and the distance between the reference antenna unit and the second position are set to be the same.

[0022] The above reference antenna unit and the above satellite terminal can alternately move to a position where they are spaced apart from each other while facing the above measurement unit.

[0023] The transmission performance of the satellite terminal calculated by the above-mentioned calculation unit includes the effective isotropic radiative power of the satellite terminal. Effects of the invention

[0024] According to embodiments of the present invention, the transmission performance of a satellite terminal can be measured without separating the components of the satellite terminal. Accordingly, the task of measuring the transmission performance of a satellite terminal can be simplified. Furthermore, the transmission performance of a satellite terminal having a structure in which components are not separated can also be easily measured. Therefore, the transmission performance of various types of satellite terminals can be efficiently verified. Brief explanation of the drawing

[0025] FIG. 1 is a diagram showing the configuration of a satellite terminal performance measuring device according to an embodiment of the present invention. FIG. 2 is a flowchart illustrating a method for measuring satellite terminal performance according to an embodiment of the present invention. Specific details for implementing the invention

[0026] Hereinafter, embodiments of the present invention will be described in more detail with reference to the attached drawings. However, the present invention is not limited to the embodiments disclosed below but may be implemented in various different forms, and these embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention. To describe the invention in detail, the drawings may be exaggerated, and like reference numerals in the drawings refer to like elements.

[0028] FIG. 1 is a diagram showing the configuration of a satellite terminal performance measuring device according to an embodiment of the present invention. Below, a satellite terminal performance measuring device according to an embodiment of the present invention will be described.

[0029] Referring to FIG. 1, the satellite terminal performance measuring device (100) is a satellite terminal performance measuring device for measuring the transmission performance of the satellite terminal (50). To understand the present invention, the satellite terminal (50) will be described first. The satellite terminal (50) can transmit a user's signal to the satellite or deliver a signal received from the satellite to the user. In detail, the satellite terminal can receive a modulated signal, such as voice, data, or video, from a user device (e.g., computer, telephone, etc.), convert it into a radio frequency signal suitable for the satellite, and transmit it to the satellite, or deliver the signal received from the satellite to the user device so that it can be restored (demodulated) to the original information. As shown in FIG. 1, the satellite terminal (50) includes an up-frequency converter (52), an amplifier (53), and a first antenna (54).

[0030] At this time, a first signal generator (40) may be provided. The first signal generator (40) may generate a first signal for measuring the transmission performance of the satellite terminal (50). The first signal generator (40) may be detachably connected to the satellite terminal (50) to input the first signal to the satellite terminal (50). The first signal may be a carrier signal to be transmitted to the satellite.

[0031] The up-frequency converter (52) can be connected to receive a signal from the first signal generator (40). Accordingly, the first signal generated by the first signal generator (40) can be input to the up-frequency converter (52). The up-frequency converter (52) can up-convert the frequency of the first signal to a higher frequency band or microwave band used for satellite communication.

[0032] The amplifier (53) can be connected to receive a signal from the up-frequency converter (52). Accordingly, a first signal, in which the frequency band has been up-converted at the up-frequency converter (52), can be input to the amplifier (53). The amplifier (53) can amplify the first signal. For example, the amplifier (53) may be a High Power Amplifier (HPA) and can increase the strength (or power) of the first signal so that the first signal can reach the satellite and be received stably.

[0033] The first antenna (54) can be connected to receive a signal from the amplifier (53). Accordingly, the first signal, whose strength has been amplified by the amplifier (53), can be input to the first antenna (54). The first antenna (54) can convert the first signal into an electromagnetic wave form, concentrate it in a specific direction, and transmit it externally. Therefore, when communicating with a satellite, the first antenna (54) can transmit the first signal toward the satellite, and the satellite can receive the first signal transmitted from the first antenna (54). The first antenna (54) may be a parabolic dish antenna or an electronically steered antenna (ESA). If the first antenna (54) is an electronically steered antenna, it may have a structure in which the radiating element of the first antenna (54) and the amplifier (53) are not separated.

[0034] At this time, the performance of the satellite terminal (50) in transmitting a signal may affect the communication quality. Therefore, a test to verify the transmission performance of the satellite terminal (50) can be performed using a satellite terminal performance measuring device (100). As shown in FIG. 1, the satellite terminal performance measuring device (100) includes a reference antenna unit (110), a measuring unit (120), and a calculation unit (130).

[0035] The reference antenna unit (110) may have its transmission performance verified in advance. The transmission performance of the reference antenna unit (110) may be the effective isotropic radiated power of the reference antenna unit (110). The antenna, signal generator, and cable provided in the reference antenna unit (110) may be separated to measure the transmission gain of the antenna in advance at an antenna test site, measure the strength of the signal generated by the signal generator in advance, and measure and verify the loss occurring in the cable in advance, after which the effective isotropic radiated power of the reference antenna unit (110) can be verified in advance. To this end, the satellite terminal performance measuring device (100) may further include a verification unit (140). Before measuring the transmission performance of the satellite terminal (50), the verification unit (140) can receive information regarding the transmission gain of the antenna of the reference antenna unit (110) measured in advance, the signal strength generated by the signal generator of the reference antenna unit (110), and the loss occurring in the cable connecting the antenna of the reference antenna unit (110) and the signal generator, and can calculate the effective isotropic radiated power of the reference antenna unit (110) in advance. Specifically, the verification unit (140) can calculate the effective isotropic radiated power of the reference antenna unit (110) by performing an operation that adds the transmission gain of the antenna, the second signal strength, and the loss occurring in the cable. Thus, information regarding the transmission performance of the reference antenna unit (110) may be obtained in advance. The reference antenna unit (110) may have a simpler configuration than the satellite terminal (50). The reference antenna unit (110) includes a second signal generator (111) and a second antenna (112).

[0036] The second signal generator (111) can generate a second signal. The second signal may be a carrier signal, just like the first signal.

[0037] The second antenna (112) is an antenna whose transmission gain has been measured in advance. The second antenna (112) can be connected to receive a signal from the second signal generator (111). For example, the second antenna (112) can be connected to the second signal generator (111) by a cable. Accordingly, the second signal generated by the second signal generator (111) can be input to the second antenna (112) through the cable. The second antenna (112) can convert the second signal into an electromagnetic wave form, concentrate it in a specific direction, and transmit it externally.

[0038] The measuring unit (120) can measure the first strength value of a first signal transmitted by the satellite terminal (50) and the strength value of a second signal transmitted by the reference antenna unit (110), respectively. Specifically, the measuring unit (120) can receive the first signal transmitted by the satellite terminal (50) at a position facing the satellite terminal (50) to measure the strength value of the first signal, and the measuring unit (120) can receive the second signal transmitted by the reference antenna unit (110) at a position facing the reference antenna unit (110) to measure the strength value of the second signal. The measuring unit (120) includes a receiving antenna (121) and a signal measuring device (122).

[0039] The receiving antenna (121) can receive a signal. For example, if the first antenna (54) of the satellite terminal (50) transmits a first signal while facing and separated from the receiving antenna (121), the first signal can be received by the receiving antenna (121). Additionally, if the second antenna (112) of the reference antenna unit (110) transmits a second signal while facing and separated from the receiving antenna (121), the second signal can be received by the receiving antenna (121). The receiving antenna (121) can convert a signal in the form of an electromagnetic wave into an electrical signal.

[0040] A signal measuring device (122) can be connected to receive a signal from a receiving antenna (121). Accordingly, a first signal or a second signal received by the receiving antenna (121) can be input to the signal measuring device (122). When the first signal is input to the signal measuring device (122), the signal measuring device (122) can analyze the first signal to measure a first intensity value, and when the second signal is input to the signal measuring device (122), the signal measuring device (122) can analyze the second signal to measure a second intensity value. For example, the signal measuring device (122) may be a spectrum analyzer. Therefore, the signal measuring device (122) can measure the power of the first signal or the second signal and display it as an intensity value.

[0041] At this time, in one embodiment, the measuring unit (120) may be installed to be movable between a first position that is spaced apart from the satellite terminal (50) and a second position that is spaced apart from the reference antenna unit (110). The distance between the satellite terminal (50) and the first position and the distance between the reference antenna unit (110) and the second position may be set to be equal. For example, the satellite terminal (50) and the reference antenna unit (110) may be spaced apart in a first direction, the first position may be spaced apart from the satellite terminal (50) in a second direction that intersects (or is orthogonal) the first direction, and the second position may be spaced apart from the reference antenna unit (110) in the second direction, thereby being spaced apart from the first position and the first direction. The measuring unit (120) may move along the first direction between the first position and the second position. Accordingly, when the measuring unit (120) moves to the first position, the receiving antenna (121) of the measuring unit (120) can be separated from and face the first antenna (54) of the satellite terminal (50), and when the measuring unit (120) moves to the second position, the receiving antenna (121) of the measuring unit (120) can be separated from and face the second antenna (112) of the reference antenna unit (110). Thus, the measuring unit (120) can be moved to the first position to receive the first signal and measure its strength, and then the measuring unit (120) can be moved to the second position to receive the second signal and measure its strength. Alternatively, the measuring unit (120) can be moved to the second position to receive the second signal and measure its strength, and then the measuring unit (120) can be moved to the first position to receive the first signal and measure its strength. Since the distance (D1) at which the receiving antenna (121) is separated from the first antenna (54) at the first position and the distance (D2) at which the receiving antenna (121) is separated from the second antenna (112) at the second position are the same, the receiving antenna (121) can receive the first signal and the second signal, respectively, under the same distance conditions.

[0042] Meanwhile, in another embodiment, the position of the measurement unit (120) is fixed, and the reference antenna unit (110) and the satellite terminal (50) may alternately move to a third position where they are separated from and face the measurement unit (120). When the satellite terminal (50) moves to the third position, the first antenna (54) of the satellite terminal (50) can be separated from and face the receiving antenna (121) of the measurement unit (120), and the first signal transmitted from the first antenna (54) can be received by the receiving antenna (121). After moving the satellite terminal (50) to another position, when the reference antenna unit (110) moves to the third position, the second antenna (112) of the reference antenna unit (110) can be separated from and face the receiving antenna (121) of the measurement unit (120), and the second signal transmitted from the second antenna (112) can be received by the receiving antenna (121). Alternatively, the reference antenna unit (110) may be positioned at a third position first to receive the second signal from the measurement unit (120), and then the reference antenna unit (110) may be moved to another position and the satellite terminal (50) may be positioned at the third position to receive the first signal from the measurement unit (120). Accordingly, when the receiving antenna (121) receives the first signal, the receiving antenna (121) is separated from the second antenna (112) at the same distance as the receiving antenna (121) is separated from the first antenna (54) to receive the second signal, so the receiving antenna (121) can receive the first signal and the second signal, respectively, under the same distance conditions.

[0043] The calculation unit (130) may be connected to receive information from the measurement unit (120) and the verification unit (140). Accordingly, information regarding the first intensity value and the second intensity value measured by the measurement unit (120), and information regarding the transmission performance of the reference antenna unit (110) calculated in advance by the verification unit (140) may be input to the calculation unit (130). Thus, the calculation unit (130) can calculate the transmission performance of the satellite terminal (50) based on the transmission performance of the reference antenna unit (110) according to the difference between the first intensity value and the second intensity value. In detail, the calculation unit (130) can calculate the effective isotropic radiant power of the satellite terminal (50), which represents the transmission performance of the satellite terminal (50), by calculating the effective isotropic radiant power of the reference antenna unit (110), the first intensity value, and the second intensity value according to a pre-set calculation formula. The transmission performance of the satellite terminal (50) can be evaluated by checking the effective isotropic radiative power of the calculated satellite terminal (50).

[0044] In this way, the transmission performance of the satellite terminal (50) can be measured without separating the components of the satellite terminal (50) (e.g., the first antenna (54) and the amplifier (53)). Accordingly, the task of measuring the transmission performance of the satellite terminal (50) can be simplified. In addition, the transmission performance of the satellite terminal (50) having a structure in which the components are not separated can also be easily measured. Therefore, the transmission performance of various types of satellite terminals can be efficiently verified.

[0046] FIG. 2 is a flowchart illustrating a method for measuring satellite terminal performance according to an embodiment of the present invention. Below, a method for measuring satellite terminal performance according to an embodiment of the present invention will be described.

[0047] A satellite terminal performance measurement method is a method for measuring the transmission performance of a satellite terminal. Referring to FIG. 2, the satellite terminal performance measurement method includes a process of receiving a first signal transmitted by a satellite terminal and measuring a first intensity value (S110), a process of receiving a second signal transmitted by a reference antenna unit whose transmission performance has been previously verified and measuring a second intensity value (S120), and a process of calculating the transmission performance of the satellite terminal based on the transmission performance of the reference antenna unit according to the difference between the first intensity value and the second intensity value (S130).

[0048] At this time, the satellite terminal performance measurement method can be performed by a satellite terminal performance measurement device according to an embodiment of the present invention having the configuration of FIG. 1. Accordingly, the processes of performing the satellite terminal performance measurement method will be described below with reference to FIG. 1. However, the satellite terminal performance measurement method is not limited thereto and can be performed by a satellite terminal performance measurement device of various configurations.

[0049] First, the first strength value of the first signal transmitted by the satellite terminal is measured (S110). To do this, the satellite terminal (50) can be controlled to transmit the first signal to the measurement unit (120) by amplifying the first signal to its maximum strength. That is, the first signal generator (40) connected to the satellite terminal (50) can generate the first signal, and the amplifier (53) of the satellite terminal (50) can be controlled to amplify the first signal. In order for the amplifier (53) to amplify the first signal to its maximum, the strength of the first signal can be amplified by the amplifier (53) by sequentially increasing it by a preset range until the strength of the first signal reaches a limit. The limit at which the amplifier (53) can amplify the strength of the first signal can be calculated as the maximum strength at which the amplifier (53) can amplify the first signal. The first signal amplified by the amplifier (53) can be input to the first antenna (54) provided in the satellite terminal (50) and transmitted externally. When the satellite terminal (50) transmits a first signal at maximum strength, the measuring unit (120) can receive the first signal at a location spaced apart from the satellite terminal (50) and check the first strength value. The measuring unit (120) may be positioned at a location spaced apart from the satellite terminal (50) by a preset distance.

[0050] Next, the second strength value of the second signal transmitted by the reference antenna unit, whose transmission performance has been verified in advance, is measured (S120). To this end, the reference antenna unit (110) can be controlled to transmit the second signal toward the measurement unit (120). That is, the second signal can be generated by the second signal generator (111) of the reference antenna unit (110), and the second signal can be input to the second antenna (112) of the reference antenna unit (110) via a cable and transmitted externally. The measurement unit (120) can be positioned to receive the second signal at a location separated from the reference antenna unit (110) by a distance equal to the set distance at which the measurement unit (120) is positioned to receive the first signal from the satellite terminal (50). Accordingly, when the second signal is transmitted, the measurement unit (120) can receive the second signal and verify the second strength value. Since the distance between the satellite terminal (50) and the measuring unit (120) when transmitting the first signal and the distance between the reference antenna unit (110) and the measuring unit (120) when transmitting the second signal are the same, the measuring unit (120) can receive the first signal and the second signal, respectively, and measure their strengths under the same distance conditions.

[0051] At this time, in order for the measuring unit (120) to receive the first signal and the second signal and measure their strengths under the same distance conditions, in one embodiment, the measuring unit (120) may be moved between a first position that is spaced apart from the satellite terminal (50) and a second position that is spaced apart from the reference antenna unit (110). When the measuring unit (120) moves to the first position, it can receive the first signal while facing the satellite terminal (50) while spaced apart from it, and when the measuring unit (120) moves to the second position, it can receive the second signal while facing the reference antenna unit (110) while spaced apart from it. Alternatively, in another embodiment, the position of the measuring unit (120) may be fixed, and the reference antenna unit (110) and the satellite terminal (50) may alternately move to a third position that is spaced apart from the measuring unit (120). When the satellite terminal (50) moves to a third position, the satellite terminal (50) can transmit a first signal while facing the measurement unit (120) while separated from it, and when the reference antenna unit (110) moves to a third position, the reference antenna unit (110) can transmit a second signal while facing the measurement unit (120) while separated from it.

[0052] In addition, the transmission gain of the reference antenna unit (50), the strength of the second signal generated by the reference antenna unit (50), and the loss occurring in the cable provided in the reference antenna unit (50) can be measured in advance, and the transmission performance of the reference antenna unit can be calculated in advance using this. Specifically, the transmission gain of the second antenna (112) of the reference antenna unit (50), the strength of the second signal, and the loss occurring in the cable can be calculated according to the following formula (1) to calculate the effective isotropic radiated power representing the transmission performance of the reference antenna unit (110).

[0054] Formula (1): EIRP ref = S + L + G

[0056] Here, EIRP refis the effective isotropic radiated power representing the transmission performance of the reference antenna unit (110), S is the strength of the second signal generated by the second signal generator (111) provided in the reference antenna unit (110), L is the loss occurring in the cable provided in the reference antenna unit (110), and G is the transmission gain of the reference antenna unit (110). The transmission gain of the reference antenna unit (110) and the loss occurring in the cable are information obtained by measuring in advance, and the strength of the second signal generated is information obtained by measuring when the second signal generator (111) of the reference antenna unit (110) generates the second signal. By substituting the obtained information into the calculation formula (1), the effective isotropic radiated power of the reference antenna unit (110) representing the transmission performance of the reference antenna unit (110) can be calculated. Therefore, information regarding the effective isotropic radiated power of the reference antenna unit (110) can be checked in advance before measuring the transmission performance of the satellite terminal (50).

[0057] Meanwhile, although the above description describes the process of measuring the first intensity value followed by measuring the second intensity value in that order, the order in which the process of measuring the second intensity value and the process of measuring the first intensity value are performed can be varied. For example, the process of measuring the second intensity value first and then measuring the first intensity value may be performed.

[0058] Next, the transmission performance of the satellite terminal is calculated based on the transmission performance of the reference antenna section according to the difference between the first intensity value and the second intensity value (S130). That is, the calculation unit (130) can calculate the effective isotropic radiated power of the reference antenna section (110) with the difference between the first intensity value and the second intensity value. In detail, the calculation unit (130) can calculate the effective isotropic radiated power representing the transmission performance of the satellite terminal (50) using the following calculation formula (2).

[0060] Formula (2): EIRP t = EIRP ref + (P1- P2)

[0062] Here, EIRP t is the effective isotropic radiative power representing the transmission performance of the satellite terminal (50), P1 is the first intensity value, and P2 is the second intensity value. The transmission performance of the satellite terminal (50) is information obtained by the verification unit (140) in advance, the first intensity value is information obtained by the measurement unit (120) measuring the intensity of the first signal, and the second intensity value is information obtained by the measurement unit (120) measuring the intensity of the second signal. By substituting the obtained information into the calculation formula (2), the effective isotropic radiative power of the satellite terminal (50) representing the transmission performance of the satellite terminal (50) can be calculated. Accordingly, since the effective isotropic radiating power of the satellite terminal (50) can be verified even when the amplifier (53) and the first antenna (54) of the satellite terminal (50) are combined, there is no need to separate the amplifier (53) and the first antenna (54) of the satellite terminal (50) to find the degree to which the amplifier (53) amplifies the first signal and to test the first antenna (54) at a separate test site to measure the transmission gain. Therefore, the effective isotropic radiating power of the satellite terminal (50) can be easily calculated.

[0063] In this way, the transmission performance of the satellite terminal (50) can be measured without separating the components of the satellite terminal (50) (e.g., the first antenna (54) and the amplifier (53)). Accordingly, the task of measuring the transmission performance of the satellite terminal (50) can be simplified. In addition, the transmission performance of the satellite terminal (50) having a structure in which the components are not separated can also be easily measured. Therefore, the transmission performance of various types of satellite terminals can be efficiently verified.

[0065] As such, although specific embodiments have been described in the detailed description of the present invention, various modifications are possible within the scope of the invention, and various combinations between embodiments are also possible. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the claims set forth below as well as equivalents thereof. Explanation of the symbols

[0066] 50: Satellite terminal 100: Satellite terminal performance measuring device 110: Reference antenna section 120: Measurement section 130: Output section

Claims

Claim 1 A method for measuring the transmission performance of a satellite terminal, comprising: a process in which a measuring unit receives a first signal transmitted by the satellite terminal and measures a first intensity value; a process in which the measuring unit receives a second signal transmitted by a reference antenna unit whose transmission performance has been previously verified and measures a second intensity value; and a process of calculating the transmission performance of the satellite terminal based on the transmission performance of the reference antenna unit according to the difference between the first intensity value and the second intensity value; wherein the measuring unit is installed to be movable between a first position that can be spaced apart from the satellite terminal and a second position that can be spaced apart from the reference antenna unit, and the process of measuring the first intensity value is performed while the measuring unit is moved to the first position, and the process of measuring the second intensity value is performed while the measuring unit is moved to the second position. Claim 2 A method for measuring satellite terminal performance according to claim 1, wherein the process of measuring the first intensity value comprises: a process of controlling the satellite terminal to amplify and transmit the first signal to a maximum intensity; and a process of receiving the first signal and verifying the first intensity value when the satellite terminal transmits the first signal to the maximum intensity. Claim 3 A method for measuring satellite terminal performance according to claim 2, wherein the process of controlling the transmission of the first signal by amplifying it to the maximum strength comprises: a process of generating the first signal; a process of amplifying the strength of the first signal until it reaches a limit value; and a process of calculating the limit value as the maximum strength. Claim 4 A method for measuring satellite terminal performance according to claim 1, wherein the process of measuring the first intensity value includes receiving the first signal at a location spaced apart from the satellite terminal by a preset distance and verifying the first intensity value, and the process of measuring the second intensity value includes receiving the second signal at a location spaced apart from the reference antenna unit by the same distance as the preset distance and verifying the second intensity value. Claim 5 A method for measuring satellite terminal performance according to any one of claims 1 to 4, wherein the transmission performance includes effective isotropic radiative power. Claim 6 A method for measuring satellite terminal performance according to claim 5, wherein the transmission gain of the reference antenna section and the loss occurring in the cable provided in the reference antenna section are measured in advance, and the effective isotropic radiated power of the reference antenna section is calculated by the following formula (1). Formula (1): EIRP ref = S + L + G(where, EIRP ref is the effective isotropic radiated power of the reference antenna section, S is the intensity of the second signal generated, L is the loss occurring in the cable, and G is the transmit gain of the reference antenna section) Claim 7 In claim 6, the process of calculating the transmission performance of the satellite terminal is a method for measuring satellite terminal performance using the following formula (2). Formula (2): EIRP t = EIRP ref + (P1- P2)(where, EIRP t is the effective isotropic radiative power of the satellite terminal, P1 is the first intensity value, and P2 is the second intensity value) Claim 8 A satellite terminal performance measuring device for measuring the transmission performance of a satellite terminal, comprising: a reference antenna unit in which the transmission performance is pre-confirmed; a measuring unit for measuring, respectively, a first intensity value of a first signal transmitted by the satellite terminal and a second intensity value of a second signal transmitted by the reference antenna unit; and a calculating unit for calculating the transmission performance of the satellite terminal based on the transmission performance of the reference antenna unit according to the difference between the first intensity value and the second intensity value; wherein the measuring unit is installed to be movable between a first position that can be spaced apart from the satellite terminal and a second position that can be spaced apart from the reference antenna unit. Claim 9 delete Claim 10 A satellite terminal performance measuring device according to claim 8, wherein the distance between the satellite terminal and the first position and the distance between the reference antenna part and the second position are set to be the same. Claim 11 delete Claim 12 A satellite terminal performance measuring device according to claim 8 or claim 10, wherein the transmission performance of the satellite terminal calculated by the calculation unit includes the effective isotropic radiative power of the satellite terminal.

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