Satellite terminal performance measuring apparatus and method

Abstract

The present invention provides a method for measuring the reception performance of a satellite terminal, comprising: a process of transmitting a test signal to the satellite terminal and measuring a first signal quality of the test signal received by the satellite terminal; a process of transmitting a test signal to a reference antenna unit whose reception performance has been previously verified and measuring a second signal quality of the test signal received by the reference antenna unit; and a process of calculating the reception performance of the satellite terminal based on the reception performance of the reference antenna unit according to the difference between the first signal quality and the second signal quality; and the method can easily measure the reception 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 reception performance of a satellite terminal (e.g., the antenna gain over noise temperature ratio (G / T) of a satellite terminal). 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 reception performance of a satellite terminal can affect communication quality, it is necessary to measure the reception performance of the satellite terminal to test whether it is suitable for use in satellite communication. Conventionally, the antenna and the signal processor equipped in the satellite terminal were separated, the reception gain of the antenna and the noise temperature generated by the processor were measured separately, and the reception performance of the satellite terminal was verified using the measurement results.

[0004] However, there is a problem in that the process of measuring satellite terminal performance becomes complex because the antenna and signal processor must be separated to measure gain and noise temperature separately whenever the reception performance of the satellite terminal is verified. Additionally, if the antenna is an electronic beam steering antenna, there is a problem in that the reception performance of the satellite terminal cannot be verified because the antenna and signal processor cannot be structurally separated. Prior art literature

[0005] (Patent Document 0001) KR 10-1366131 B The problem to be solved

[0006] The present invention provides a method for measuring reception performance and a measuring device for a satellite terminal that can measure reception 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 reception performance of a satellite terminal. means of solving the problem

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

[0009] The process of measuring the first signal quality includes a process of generating a test signal, transmitting it to the satellite terminal, and verifying the first signal quality, and the process of measuring the second signal quality includes a process of verifying the frequency and strength of the test signal transmitted to the satellite terminal; and a process of generating a test signal having the same frequency and strength as the test signal transmitted to the satellite terminal, transmitting it to the reference antenna unit, and verifying the second signal quality.

[0010] The process of measuring the first signal quality includes the process of verifying the first signal quality by transmitting a test signal at a location separated from the satellite terminal by a preset distance, and the process of measuring the second signal quality includes the process of verifying the second signal quality by transmitting a test signal at a location separated from the reference antenna unit by a distance equal to the preset distance.

[0011] The above test signal includes a carrier signal, the first signal quality and the second signal quality include a carrier-to-noise power density ratio, and the reception performance includes a gain-to-noise temperature ratio.

[0012] The reception gain and system noise temperature of the above reference antenna section are measured in advance, and the gain-to-noise temperature ratio of the above reference antenna section is calculated by dividing the reception gain of the above reference antenna section by the system noise temperature of the above reference antenna section.

[0013] The process of calculating the reception performance of the above satellite terminal uses the following formula.

[0014] Calculation formula: G / T t = G / T ref + (C / NO1- C / NO2)

[0015] (Here, G / T t is the gain-to-noise temperature ratio of the above satellite terminal, and G / T ref is the gain-to-noise temperature ratio of the reference antenna section, C / NO1 is the first signal quality, and C / NO2 is the second signal quality.

[0016] A satellite terminal performance measuring device for measuring the reception performance of a satellite terminal comprises: a transmitting unit for transmitting a test signal; a reference antenna unit in which reception performance is pre-verified; a first measuring unit for measuring a first signal quality of a test signal received by the satellite terminal; a second measuring unit for measuring a second signal quality of a test signal received by the reference antenna unit; and a calculation unit for calculating the reception performance of the satellite terminal based on the reception performance of the reference antenna unit according to the difference between the first signal quality and the second signal quality.

[0017] The above-mentioned transmitter is installed to be movable between a first position that can be spaced apart while facing the satellite terminal and a second position that can be spaced apart while facing the reference antenna unit.

[0018] 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.

[0019] 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 transmitter unit.

[0020] The reception performance of the satellite terminal calculated by the above-mentioned calculation unit includes the gain-to-noise temperature ratio of the satellite terminal. Effects of the invention

[0021] According to embodiments of the present invention, the reception performance of a satellite terminal can be measured without separating the components of the satellite terminal. Accordingly, the task of measuring the reception performance of the satellite terminal can be simplified. Furthermore, the reception performance of a satellite terminal having a structure in which components are not separated can also be easily measured. Therefore, the reception performance of various types of satellite terminals can be efficiently verified. Brief explanation of the drawing

[0022] 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

[0023] 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.

[0025] 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.

[0026] Referring to FIG. 1, the satellite terminal performance measuring device (100) is a satellite terminal performance measuring device for measuring the reception 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 a first antenna (51), a first low-noise amplifier (52), and a down-frequency converter (53).

[0027] The first antenna (51) can receive a signal. That is, the first antenna (51) can receive a signal in the form of an electromagnetic wave and convert it into an electrical form. Accordingly, the first antenna (51) can receive a signal transmitted by a satellite. 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, the structure may be such that the radiating element of the first antenna (54) and the first low-noise amplifier (52) are not separated.

[0028] The first low-noise amplifier (52) can be connected to receive a signal from the first antenna (51). Accordingly, the signal received by the first antenna (51) can be input to the first low-noise amplifier (52). The first low-noise amplifier (52) can amplify the input signal. That is, since the strength of the signal may decrease during the process of transmitting the signal to the first antenna (51), the strength of the signal can be amplified by the first low-noise amplifier (52) to stably process the signal with reduced strength. The first low-noise amplifier (52) can be designed to minimize noise generated internally.

[0029] The down-frequency converter (53) can be connected to receive a signal from the first low-noise amplifier (52). Accordingly, a signal with amplified strength from the first low-noise amplifier (52) can be input to the down-frequency converter (53). The down-frequency converter (53) can lower the frequency of the input signal. For example, a signal transmitted from a satellite may be a radio frequency (RF) signal, and the down-frequency converter (53) can down-convert the radio frequency signal to an intermediate frequency (IF) signal or a baseband signal of a lower frequency.

[0030] At this time, the signal reception performance of the satellite terminal (50) may affect the communication quality. Therefore, a test to verify the reception 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 transmitting unit (110), a reference antenna unit (120), a first measuring unit (130), a second measuring unit (140), and a calculation unit (150).

[0031] The transmitting unit (110) can transmit a test signal toward a satellite terminal (50) or a reference antenna unit (120). The transmitting unit (110) includes a signal generator (111) and a transmitting antenna (112).

[0032] The signal generator (111) can generate a test signal. Specifically, if the frequency and strength of the test signal to be generated are set, the signal generator (111) can generate a test signal according to the set frequency and strength. The test signal may be a carrier signal.

[0033] The transmitting antenna (112) may be positioned facing the satellite terminal (50) or the reference antenna unit (120) while being spaced apart. The transmitting antenna (112) may be connected to receive a signal from the signal generator (111). Accordingly, a test signal generated by the signal generator (111) may be input to the transmitting antenna (112). The transmitting antenna (112) may convert the test signal into an electromagnetic wave form and concentrate and transmit it toward the facing satellite terminal (50) or reference antenna unit (120).

[0034] At this time, the transmitting unit (110) may further include an information storage unit (not shown). When a test signal is first transmitted to the satellite terminal (50) and then transmitted to the reference antenna unit (120), the information storage unit can check the frequency and strength of the test signal transmitted to the satellite terminal (50) and store the corresponding information. That is, the signal generator (111) can generate a test signal having an arbitrary frequency and strength to transmit to the satellite terminal (50), and the information storage unit can check and store the frequency and strength of the test signal generated by the signal generator (111). When the signal generator (111) intends to generate a test signal to be transmitted to the reference antenna unit (120), the information stored in the information storage unit can be transmitted to the signal generator (111), and the signal generator (111) can generate a test signal having a frequency and strength according to the transmitted information. When a test signal is first transmitted to the reference antenna unit (120) and then transmitted to the satellite terminal (50), the information storage unit can check the frequency and strength of the test signal transmitted to the reference antenna unit (120) and store the corresponding information. When the signal generator (111) intends to generate a test signal to be transmitted to the satellite terminal (50), the information stored in the information storage unit can be transmitted to the signal generator (111), and the signal generator (111) can generate a test signal having the frequency and strength according to the transmitted information. Accordingly, the test signal transmitted to the reference antenna unit (120) can have the same frequency and strength as the test signal transmitted to the satellite terminal (50). Therefore, the test signal generated under the same conditions is received by the satellite terminal (50) and the reference antenna unit (120), and the signal quality for the same test signal can be measured at each.

[0035] The reference antenna unit (120) may have its reception performance verified in advance. The reception performance of the reference antenna unit (120) may be the gain-to-noise temperature ratio of the reference antenna unit (120). By separating the antenna and the low-noise amplifier provided in the reference antenna unit (120), the transmission gain of the antenna can be measured in advance at an antenna test site, and the system noise temperature generated by the low-noise amplifier can be measured and verified in advance, after which the gain-to-noise temperature ratio of the reference antenna unit (120) can be verified in advance. To this end, the satellite terminal performance measuring device (100) may further include a verification unit (160). Before measuring the reception performance of the satellite terminal (50), the verification unit (160) can receive information regarding the reception gain of the antenna measured in advance by the reference antenna unit (120) and the system noise temperature generated by the low-noise amplifier of the reference antenna unit (120), and calculate the gain-to-noise temperature ratio of the reference antenna unit (120) in advance. In detail, the verification unit (160) can calculate the gain-to-noise temperature ratio of the reference antenna unit (120) by performing a calculation that divides the reception gain of the antenna by the system noise temperature. Thus, information regarding the reception performance of the reference antenna unit (120) may be obtained in advance. The reference antenna unit (120) may have a simpler configuration than the satellite terminal (50). The reference antenna unit (120) includes a second antenna (121) and a second low-noise amplifier (122).

[0036] The second antenna (121) is an antenna whose reception gain has been measured in advance. The second antenna (121) can receive a signal. Accordingly, the second antenna (121) can receive a test signal transmitted by the transmitter (110). The second antenna (121) can receive the test signal in the form of an electromagnetic wave and convert it into an electrical form.

[0037] The second low-noise amplifier (122) can be connected to receive a signal from the second antenna (121). Accordingly, the test signal received by the second antenna (121) can be input to the second low-noise amplifier (122). The second low-noise amplifier (122) can amplify the input test signal. That is, since the strength of the test signal may decrease during the process of transmitting it to the second antenna (121), the strength of the test signal can be amplified by the second low-noise amplifier (122) to stably process the test signal with reduced strength. The second low-noise amplifier (122) can be designed to minimize noise generated internally.

[0038] At this time, in one embodiment, the transmitting unit (110) 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 (120). The distance between the satellite terminal (50) and the first position and the distance between the reference antenna unit (120) and the second position may be set to be equal. For example, the satellite terminal (50) and the reference antenna unit (120) 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 (120) in the second direction, thereby being spaced apart from the first position and the first direction. The transmitting unit (110) may move along the first direction between the first position and the second position. Accordingly, when the transmitting unit (110) moves to a first position, the transmitting antenna (112) of the transmitting unit (110) can be separated from and face the first antenna (51) of the satellite terminal (50), and when the transmitting unit (110) moves to a second position, the transmitting antenna (112) of the transmitting unit (110) can be separated from and face the second antenna (121) of the reference antenna unit (120). Therefore, when the transmitting unit (110) is moved to a first position and a test signal is transmitted, the satellite terminal (50) can receive the test signal, and when the transmitting unit (110) is moved to a second position and a test signal is transmitted, the reference antenna unit (120) can receive the test signal. Since the distance (D1) at which the transmitting antenna (112) is separated from the first antenna (51) at the first position and the distance (D2) at which the transmitting antenna (112) is separated from the second antenna (121) at the second position are the same, the first antenna (51) and the second antenna (121) can each receive a test signal under the same distance conditions.

[0039] Meanwhile, in another embodiment, the position of the transmitting unit (110) is fixed, and the reference antenna unit (120) and the satellite terminal (50) may alternately move to a third position where they are separated from and face the transmitting unit (110). When the satellite terminal (50) moves to the third position, the first antenna (51) of the satellite terminal (50) can be separated from and face the transmitting antenna (112) of the transmitting unit (110), and a test signal transmitted from the transmitting antenna (112) can be received by the first antenna (51). After moving the satellite terminal (50) to another position, when the reference antenna unit (120) moves to the third position, the second antenna (121) of the reference antenna unit (120) can be separated from and face the transmitting antenna (112) of the transmitting unit (110), and a test signal transmitted from the transmitting antenna (112) can be received by the second antenna (121). Alternatively, the reference antenna unit (120) may be positioned at a third location first to receive the test signal transmitted by the transmitter (110), and then the reference antenna unit (120) may be moved to another location and the satellite terminal (50) may be positioned at the third location to receive the test signal transmitted by the transmitter (110). Accordingly, when the first antenna (51) and the second antenna (121) receive the test signal, the transmitter antenna (112) is separated from the second antenna (121) at the same distance as the distance at which the transmitter antenna (112) is separated from the first antenna (51) to transmit the test signal, so the first antenna (51) and the second antenna (121) can each receive the test signal under the same distance conditions.

[0040] The first measuring unit (130) can be connected to the satellite terminal (50). The first measuring unit (130) can measure the first signal quality of the test signal received by the satellite terminal (50). The first signal quality may be the carrier-to-noise power density ratio. For example, the first measuring unit (130) may be a spectrum analyzer. Accordingly, the first measuring unit (130) can measure the power and noise power density of the test signal received by the satellite terminal (50), and divide the power of the test signal by the noise power density to calculate the carrier-to-noise power density ratio representing the first signal quality.

[0041] The second measurement unit (140) can be connected to the reference antenna unit (120). The first measurement unit (130) can measure the second signal quality of the test signal received by the reference antenna unit (120). The second signal quality may be the carrier-to-noise power density ratio. For example, the second measurement unit (140) may be a spectrum analyzer. Accordingly, the second measurement unit (140) can measure the power and noise power density of the test signal received by the reference antenna unit (120), and divide the power of the test signal by the noise power density to calculate the carrier-to-noise power density ratio representing the second signal quality.

[0042] The calculation unit (150) may be connected to receive information from the first measurement unit (130), the second measurement unit (140), and the verification unit (160). Accordingly, information regarding the first signal quality measured by the first measurement unit (130), information regarding the second signal quality measured by the second measurement unit (140), and information regarding the reception performance of the reference antenna unit (120) calculated in advance by the verification unit (160) may be input to the calculation unit (150). Thus, the calculation unit (150) can calculate the reception performance of the satellite terminal (50) based on the reception performance of the reference antenna unit (120) according to the difference between the first signal quality and the second signal quality. In detail, the calculation unit (150) can calculate the gain-to-noise temperature ratio of the satellite terminal (50) representing the reception performance of the satellite terminal (50) by calculating the gain-to-noise temperature ratio representing the reception performance of the reference antenna unit (120), the carrier-to-noise power density ratio representing the first signal quality, and the carrier-to-noise power density ratio representing the second signal quality according to a preset calculation formula. The reception performance of the satellite terminal (50) can be evaluated by checking the calculated gain-to-noise temperature ratio of the satellite terminal (50).

[0043] In this way, the reception performance of the satellite terminal (50) can be measured without separating the components of the satellite terminal (50) (e.g., the first antenna (51) and the first low-noise amplifier (52)). Accordingly, the task of measuring the reception performance of the satellite terminal (50) can be simplified. In addition, the reception performance of the satellite terminal (50) having a structure in which the components are not separated can also be easily measured. Therefore, the reception performance of various types of satellite terminals can be efficiently verified.

[0045] 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.

[0046] A satellite terminal performance measurement method is a method for measuring the reception performance of a satellite terminal. Referring to FIG. 2, the satellite terminal performance measurement method includes a process (S110) of transmitting a test signal to a satellite terminal and measuring a first signal quality of the test signal received by the satellite terminal, a process (S130) of transmitting a test signal to a reference antenna unit whose reception performance has been previously verified and measuring a second signal quality of the test signal received by the reference antenna unit, and a process (S130) of calculating the reception performance of the satellite terminal based on the reception performance of the reference antenna unit according to the difference between the first signal quality and the second signal quality.

[0047] 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.

[0048] First, a test signal is transmitted to a satellite terminal, and the first signal quality of the test signal received by the satellite terminal is measured (S110). To this end, a transmitter (110) can generate a test signal and transmit it to a satellite terminal (50), and the satellite terminal (50) can receive the test signal. That is, a signal generator (111) of the transmitter (110) can generate a test signal of a carrier wave having an arbitrary or preset frequency and strength, and a transmitting antenna (112) of the transmitter (110) can transmit the test signal to the satellite terminal (50) from a position separated by a preset distance from the satellite terminal (50). The satellite terminal (50) receives the test signal from a position separated from the transmitter (110) and can verify the first signal quality of the test signal received by the satellite terminal (50) through a first measuring unit (130). The first signal quality verified by the first measuring unit (130) may be the carrier-to-noise power density ratio.

[0049] Next, a test signal is transmitted to a reference antenna unit whose reception performance has been previously verified, and the second signal quality of the test signal received by the reference antenna unit is measured (S130). To this end, the transmitter (110) generates a test signal and transmits it to the reference antenna unit (120), and the reference antenna unit (120) can receive the test signal. That is, after verifying the frequency and strength of the test signal transmitted to the satellite terminal (50), the signal generator (111) of the transmitter (110) generates a test signal having the verified frequency and strength, and the transmitter antenna (112) of the transmitter (110) can transmit the test signal to the reference antenna unit (120) from a position separated by a predetermined distance from the reference antenna unit (120). The distance separated between the transmitter (110) and the reference antenna unit (120) may be the same as the distance separated between the transmitter (110) and the satellite terminal (50). Accordingly, a test signal having the same frequency and strength as the test signal transmitted to the satellite terminal (50) can be transmitted to the reference antenna unit (120), and the distance from the transmitting unit (110) when the reference antenna unit (120) receives the test signal can be the same as the distance from the transmitting unit (110) when the satellite terminal (50) receives the test signal. The reference antenna unit (120) receives the test signal at a location separated from the transmitting unit (110), and the second measurement unit (140) can verify the second signal quality of the test signal received by the reference antenna unit (120). Therefore, the second measurement unit (140) can verify the signal quality when the transmitted test signal is received by the reference antenna unit (120) in the same way as the first measurement unit (130). The second signal quality verified by the second measurement unit (140) may be the carrier-to-noise power density ratio.

[0050] At this time, the transmitting unit (110) can be moved between a first position where it is spaced apart from the satellite terminal (50) and a second position where it is spaced apart from the reference antenna unit (120) so that the satellite terminal (50) and the reference antenna unit (120) can each receive a test signal from the transmitting unit (110) under the same distance conditions. When the transmitting unit (110) moves to the first position, it can transmit a test signal to the satellite terminal (50) while spaced apart from and facing the satellite terminal (50), and when the transmitting unit (110) moves to the second position, it can transmit a test signal to the transmitting antenna (112) while spaced apart from and facing the reference antenna unit (120). Alternatively, in another embodiment, the position of the transmitting unit (110) may be fixed, and the reference antenna unit (120) and the satellite terminal (50) may alternately move to a third position where they are spaced apart from and facing the transmitting unit (110). When the satellite terminal (50) moves to a third position, it can receive the test signal transmitted by the transmitter (110) while facing it from a distance, and when the reference antenna unit (120) moves to a third position, it can receive the test signal transmitted by the transmitter (110) while facing it from a distance.

[0051] In addition, the reception gain and system noise temperature of the reference antenna unit (120) can be measured in advance, and the reception performance of the reference antenna unit (120) can be calculated in advance using this. Specifically, the reception gain of the reference antenna unit (120) can be divided by the system noise temperature of the reference antenna unit (120) to calculate a gain-to-noise temperature ratio representing the reception performance of the reference antenna unit (120).

[0052] Meanwhile, although the above description describes the process of measuring the first signal quality followed by measuring the second signal quality in that order, the order in which the process of measuring the second signal quality and the process of measuring the first signal quality are performed can be varied. For example, the process of measuring the second signal quality first and then measuring the first signal quality may be performed.

[0053] Next, the reception performance of the satellite terminal is calculated based on the reception performance of the reference antenna section according to the difference between the first signal quality and the second signal quality (S130). That is, the calculation unit (150) can calculate the gain-to-noise temperature ratio of the reference antenna section (120) with the difference between the first signal quality and the second signal quality. In detail, the calculation unit (130) can calculate the transmission performance of the satellite terminal using the following calculation formula (2). In detail, the calculation unit (150) can calculate the gain-to-noise temperature ratio representing the reception performance of the satellite terminal (50) using the following calculation formula.

[0055] Calculation formula: G / T t = G / T ref + (C / NO1- C / NO2)

[0057] Here, G / T t is the gain-to-noise temperature ratio of the satellite terminal (50), and G / T ref is the gain-to-noise temperature ratio of the reference antenna unit (120), C / NO1 is the carrier-to-noise power density ratio representing the first signal quality, and C / NO2 is the carrier-to-noise power density ratio representing the second signal quality. The first signal quality is information obtained by measuring the first measurement unit (130), the second signal quality is information obtained by measuring the second measurement unit (140), and information regarding the gain-to-noise temperature ratio of the reference antenna unit (120) is information obtained by verifying in advance by the verification unit (160). By substituting the obtained information into a calculation formula, the gain-to-noise temperature ratio of the satellite terminal (50), which represents the reception performance of the satellite terminal (50), can be calculated. Accordingly, the gain-to-noise temperature ratio of the satellite terminal (50) can be easily calculated even when the first antenna (51) and the first low-noise amplifier (52) of the satellite terminal (50) are combined.

[0058] In this way, the reception performance of the satellite terminal (50) can be measured without separating the components of the satellite terminal (50) (e.g., the first antenna (51) and the first low-noise amplifier (52)). Accordingly, the task of measuring the reception performance of the satellite terminal (50) can be simplified. In addition, the reception performance of the satellite terminal (50) having a structure in which the components are not separated can also be easily measured. Therefore, the reception performance of various types of satellite terminals can be efficiently verified.

[0060] 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

[0061] 50: Satellite terminal 100: Satellite terminal performance measuring device 110: Transmitter 120: Reference antenna 130: 1st measuring unit 140: 2nd measuring unit 150: Calculation Unit 160: Verification Unit

Claims

Claim 1 A method for measuring the reception performance of a satellite terminal, comprising: a process of transmitting a test signal to the satellite terminal and measuring a first signal quality of the test signal received by the satellite terminal; a process of transmitting a test signal to a reference antenna unit whose reception performance has been previously verified and measuring a second signal quality of the test signal received by the reference antenna unit; and a process of calculating the reception performance of the satellite terminal based on the reception performance of the reference antenna unit according to the difference between the first signal quality and the second signal quality. Claim 2 A method for measuring satellite terminal performance according to claim 1, wherein the process of measuring the first signal quality includes the process of generating a test signal, transmitting it to the satellite terminal, and verifying the first signal quality, and the process of measuring the second signal quality includes the process of verifying the frequency and strength of the test signal transmitted to the satellite terminal; and the process of generating a test signal having the same frequency and strength as the test signal transmitted to the satellite terminal, transmitting it to the reference antenna unit, and verifying the second signal quality. Claim 3 A method for measuring satellite terminal performance according to claim 1, wherein the process of measuring the first signal quality includes the process of verifying the first signal quality by transmitting a test signal at a location spaced apart from the satellite terminal by a preset distance, and the process of measuring the second signal quality includes the process of verifying the second signal quality by transmitting a test signal at a location spaced apart from the reference antenna unit by the same distance as the preset distance. Claim 4 A method for measuring satellite terminal performance according to any one of claims 1 to 3, wherein the test signal includes a carrier signal, the first signal quality and the second signal quality include a carrier-to-noise power density ratio, and the receiving performance includes a gain-to-noise temperature ratio. Claim 5 A satellite terminal performance measurement method according to claim 4, wherein the receiving gain and system noise temperature of the reference antenna section are measured in advance, and the gain-to-noise temperature ratio of the reference antenna section is calculated by dividing the receiving gain of the reference antenna section by the system noise temperature of the reference antenna section. Claim 6 In claim 5, the process of calculating the reception performance of the satellite terminal is a method for measuring satellite terminal performance using the following formula: Formula: G / T t = G / T ref + (C / NO1- C / NO2)(where, G / T t is the gain-to-noise temperature ratio of the above satellite terminal, and G / T ref is the gain-to-noise temperature ratio of the reference antenna section, C / NO1 is the first signal quality, and C / NO2 is the second signal quality. Claim 7 A satellite terminal performance measuring device for measuring the reception performance of a satellite terminal, comprising: a transmitting unit for transmitting a test signal; a reference antenna unit having a reception performance that has been previously verified; a first measuring unit for measuring a first signal quality of a test signal received by the satellite terminal; a second measuring unit for measuring a second signal quality of a test signal received by the reference antenna unit; and a calculation unit for calculating the reception performance of the satellite terminal based on the reception performance of the reference antenna unit according to the difference between the first signal quality and the second signal quality. Claim 8 A satellite terminal performance measuring device according to claim 7, wherein the transmitting part is movably installed 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 part. Claim 9 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 10 In claim 7, the reference antenna unit and the satellite terminal are alternately movable to a position where they can be spaced apart from and face the transmitting unit. Claim 11 A satellite terminal performance measuring device according to any one of claims 7 to 10, wherein the receiving performance of the satellite terminal calculated by the calculation unit includes the gain-to-noise temperature ratio of the satellite terminal.

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