A large aperture antenna Ka-band calibration device based on double feed sources

Abstract

The application discloses a kind of big aperture antenna Ka frequency band calibration control device based on double feed source, belong to spaceflight control and communication field.The device is composed of antenna, calibration feed source, transceiving feed source, field, Ka / S down converter, S / 300M down converter, power amplifier, 300M / Ka up converter, integrated baseband, power probe, calibration computer, antenna control unit, antenna driving unit etc..For large aperture antenna ground system, the application adopts normal temperature field in combination with the mode of double feed source, reduces system noise by designing single-receiving calibration feed source, and improves the calibration accuracy of system.Radio star calibration uses calibration feed source, after completing calibration task, calibration feed source is replaced by transceiving feed source to perform satellite control task.Low-temperature field is not needed, which simplifies system complexity and reduces system cost.The device has simple structure, strong operability and is easy to realize.

Description

Technical Field

[0001] This invention relates to the field of aerospace telemetry, tracking, and command (TT&C) and communication, and in particular to a Ka-band calibration and TT&C device for a large-aperture antenna based on a dual-feed source, which is applicable to pointing calibration and TT&C communication of large-aperture antennas. Background Technology

[0002] Ground-based telemetry, tracking, and command (TT&C) systems typically require pointing calibration before mission execution. For large-aperture antennas, such as a 35-meter deep-space antenna, the far-field distance in the Ka band is considerable, necessitating the use of towerless calibration devices. Radio satellite calibration is a commonly used method for large-aperture antennas. Since radio satellites are extremely far from Earth, they are treated as point sources for pointing calibration of ground-based TT&C systems. Due to the extremely weak radio satellite signals, cryogenic field amplifiers are typically used to reduce system noise and increase the system's G / T ratio, thereby improving calibration accuracy. However, cryogenic field amplifiers are complex to design and relatively expensive, increasing the system's design difficulty. Currently, there is a strong need to design a low-cost, low-complexity device that can effectively achieve radio satellite calibration and TT&C for large-aperture deep-space antennas. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the aforementioned background technology and provide a calibration and control device for a large-aperture antenna in the Ka-band based on a dual-feed source. This invention features low implementation complexity, low cost, and high stability.

[0004] The objective of this invention is achieved as follows:

[0005] A calibration and control device for a large-aperture antenna in the Ka band based on dual feed sources includes an antenna 1, a feed source, a field amplifier 3, a Ka / S downconverter 4, an S / 300M downconverter 5, a power amplifier 6, a 300M / Ka upconverter 7, an integrated baseband 8, a power probe 9, a calibration computer 10, an antenna control unit 11, and an antenna drive unit 12. The feed source used for radio satellite calibration is calibration feed source 2-1, and the feed source used for satellite telemetry and control is transceiver feed source 2-2. The calibration feed source 2-1 and transceiver feed source 2-2 are installed in the same location.

[0006] The calibration feed 2-1 and the transceiver feed 2-2 are used in a time-division multiplexing manner. Antenna 1 is connected to the feed via a waveguide. During radio satellite calibration, antenna 1 receives the signal emitted by radio satellite 13 and sends it to calibration feed 2-1. Calibration feed 2-1 receives the signal from antenna 1 and generates sum and difference signals, which are then sent to field amplifier 3. During satellite telemetry and control, antenna 1 receives the signal emitted by satellite 14 and sends it to transceiver feed 2-2. At the same time, antenna 1 receives the signal from transceiver feed 2-2 and transmits it to satellite 14. Transceiver feed 2-2 receives the signal from antenna 1, generates sum and difference signals, and sends them to field amplifier 3. Simultaneously, it radiates the signal from power amplifier 6 to antenna 1.

[0007] The field amplifier 3 receives the signal from the calibration feed 2-1 or the transceiver feed 2-2, amplifies the signal, and sends it to the Ka / S downconverter 4;

[0008] Ka / S downconverter 4 receives the Ka RF signal from field amplifier 3, and downconverts the Ka RF signal to output the S RF signal through the internal local oscillator and frequency conversion module, and transmits it to S / 300M downconverter 5.

[0009] The S / 300M downconverter 5 receives the S radio frequency signal from the Ka / S downconverter 4. Through the internal local oscillator and frequency conversion module, it downconverts the S radio frequency signal to output a 300M intermediate frequency signal, which is then divided into two paths: one path is sent to the integrated baseband 8, and the other path is sent to the power probe 9.

[0010] The integrated baseband 8 receives the 300M intermediate frequency signal from the S / 300M downconverter 5, performs AD sampling and demodulation processing, completes the downlink data demodulation, and obtains the angle error signal, which is sent to the antenna control unit 11; at the same time, it performs data modulation and DA output to generate the uplink 300M intermediate frequency signal, which is sent to the 300M / Ka upconverter 7.

[0011] The 300M / Ka upconverter 7 receives the 300M intermediate frequency signal from the integrated baseband 8, and through the internal local oscillator and frequency conversion module, upconverts the 300M intermediate frequency signal to output a Ka radio frequency signal, which is then sent to the power amplifier 6.

[0012] Power amplifier 6 receives the Ka RF signal from the 300M / Ka upconverter 7, amplifies it, and sends it to transceiver feed 2-2;

[0013] The power probe 9 is used during radio star calibration. It receives the 300M intermediate frequency signal from the S / 300M downconverter 5, performs signal power detection, and sends it to the calibration computer 10.

[0014] The calibration computer 10 is used during radio satellite calibration. It receives signals from the power probe 9, uses a calibration algorithm to obtain angular error signals, and sends them to the antenna control unit 11.

[0015] The antenna control unit 11 receives the angular error signal sent by the calibration computer 10 during radio satellite calibration, or receives the angular error signal sent by the integrated baseband 8 during satellite telemetry and control, and generates an antenna drive signal to send to the antenna drive unit 12.

[0016] The antenna drive unit 12 receives the antenna drive signal sent by the antenna control unit 11 and controls the antenna 1 to rotate in azimuth and pitch, aiming at the radio star 13 or the satellite 14.

[0017] Furthermore, radio satellite calibration and satellite telemetry and control use different links. The radio satellite calibration link equipment includes antenna 1, calibration feed 2-1, field amplifier 3, Ka / S downconverter 4, S / 300M downconverter 5, power probe 9, calibration computer 10, antenna control unit 11, antenna drive unit 12, and radio satellite 13. The satellite telemetry and control link equipment includes antenna 1, transceiver feed 2-2, field amplifier 3, Ka / S downconverter 4, S / 300M downconverter 5, integrated baseband 8, 300M / Ka upconverter 7, power amplifier 6, antenna control unit 11, antenna drive unit 12, and satellite 14.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] 1. Compared with traditional deep space large-aperture antenna ground systems, this invention adopts a calibration scheme that combines room temperature field amplifier with dual feed sources. By designing a single-receive calibration feed source, the system noise is reduced and the calibration accuracy of the system is improved. After calibration, the calibration feed source is replaced with a transmit / receive feed source to complete the measurement and control tasks.

[0020] 2. This invention simplifies system complexity and reduces system cost by using a dual-feed design, eliminating the need for low-temperature field amplifiers.

[0021] 3. The calibration feed and transceiver feed in this invention can be replaced in situ, with a simple structure, strong operability, and easy implementation. Attached Figure Description

[0022] Figure 1 This is a block diagram of the Ka-band calibration and control device for a large-aperture antenna based on dual feed sources in an embodiment of the present invention. Detailed Implementation

[0023] Reference Figure 1 A calibration and control device for a large-aperture antenna in the Ka band based on dual feed sources includes an antenna 1, a calibration feed source 2-1, a transceiver feed source 2-2, a field amplifier 3, a Ka / S downconverter 4, an S / 300M downconverter 5, a power amplifier 5, a 300M / Ka upconverter 7, an integrated baseband 8, a power probe 9, a calibration computer 10, an antenna control unit 11, and an antenna drive unit 12. The calibration feed source 2-1 is used for radio satellite calibration, and the transceiver feed source 2-2 is used for satellite telemetry and control. The calibration feed source 2-1 and the transceiver feed source 2-2 are installed in the same position and can be interchanged.

[0024] During radio satellite calibration, antenna 1 receives signals emitted by radio satellite 13 and sends them to calibration feed 2-1. Antenna 1 and calibration feed 2-1 are connected via a waveguide. During satellite telemetry and control, antenna 1 receives signals emitted by satellite 14 and sends them to transceiver feed 2-2. At the same time, antenna 1 receives signals from transceiver feed 2-2 and transmits them to satellite 14. Antenna 1 and transceiver feed 2-2 are connected via a waveguide.

[0025] The calibration feed 2-1 and the transceiver feed 2-2 are used in a time-division manner. During radio satellite calibration, calibration feed 2-1 is used, receiving signals from antenna 1 and generating sum and difference signals which are then sent to field amplifier 3. During satellite telemetry and control, calibration feed 2-1 is removed, and transceiver feed 2-2 is installed in its original position. Transceiver feed 2-2 receives signals from antenna 1, generating sum and difference signals which are then sent to field amplifier 3, while simultaneously radiating signals from power amplifier 6 back to antenna 1. During radio satellite calibration, to improve system calibration accuracy and reduce system noise, a single-receiver calibration feed 2-1 is used. After calibration, calibration feed 2-1 is replaced with transceiver feed 2-2 to complete uplink and downlink satellite telemetry and control tasks. This avoids the need for expensive cryogenic field amplifiers.

[0026] Field amplifier 3 is a room temperature field amplifier that receives signals from calibration feed 2-1 or transceiver feed 2-2, amplifies the signals, and sends them to Ka / S downconverter 4;

[0027] Ka / S downconverter 4 receives the Ka RF signal from field amplifier 3, and downconverts the Ka RF signal to output the S RF signal through the internal local oscillator and frequency conversion module, and transmits it to S / 300M downconverter 5.

[0028] The S / 300M downconverter 5 receives the S radio frequency signal from the Ka / S downconverter 4. Through the internal local oscillator and frequency conversion module, it downconverts the S radio frequency signal to output a 300M intermediate frequency signal, which is then divided into two paths: one path is sent to the integrated baseband 8, and the other path is sent to the power probe 9.

[0029] The integrated baseband 8 is used during satellite telemetry and control. It receives the 300M intermediate frequency signal from the S / 300M downconverter 5, performs AD sampling and demodulation processing, completes downlink data demodulation, and obtains the angle error signal, which is sent to the antenna control unit 11. At the same time, it performs data modulation and DA output to generate an uplink 300M intermediate frequency signal, which is sent to the 300M / Ka upconverter 7.

[0030] The 300M / Ka upconverter 7 is used during satellite telemetry and control. It receives the 300M intermediate frequency signal from the integrated baseband 8 and upconverts the 300M intermediate frequency signal to output a Ka radio frequency signal through the internal local oscillator and frequency conversion module, which is then sent to the power amplifier 6.

[0031] Power amplifier 6 is used during satellite telemetry and control. It receives the Ka radio frequency signal from the 300M / Ka upconverter 7, amplifies it, and sends it to the transceiver feed 2-2.

[0032] The power probe 9 is used during radio star calibration. It receives the 300M intermediate frequency signal from the S / 300M downconverter 5, performs signal power detection, and sends it to the calibration computer 10.

[0033] The calibration computer 10 is used during radio satellite calibration. It receives signals from the power probe 9, uses a calibration algorithm to obtain angular error signals, and sends them to the antenna control unit 11.

[0034] The antenna control unit 11 receives the angular error signal sent by the calibration computer 10 during radio satellite calibration, or receives the angular error signal sent by the integrated baseband 8 during satellite telemetry and control, and generates an antenna drive signal to send to the antenna drive unit 12.

[0035] Antenna drive unit 12 receives antenna drive signals from antenna control unit 11 and controls antenna 1 to rotate in azimuth and pitch to align with radio star 13 or satellite 14.

[0036] In this embodiment, radio satellite calibration and satellite telemetry and control use different links. The radio satellite calibration link equipment includes antenna 1, calibration feed 2-1, field amplifier 3, Ka / S downconverter 4, S / 300M downconverter 5, power probe 9, calibration computer 10, antenna control unit 11, antenna drive unit 12, and radio satellite 13, which are used to complete the calibration task. The satellite telemetry and control link equipment includes antenna 1, transceiver feed 2-2, field amplifier 3, Ka / S downconverter 4, S / 300M downconverter 5, integrated baseband 8, 300M / Ka upconverter 7, power amplifier 6, antenna control unit 11, antenna drive unit 12, and satellite 14, which are used to complete the satellite telemetry and control task.

[0037] In summary, compared to traditional deep-space large-aperture antenna ground systems, this invention employs a calibration scheme combining a room-temperature field amplifier and a dual-feed source. By designing a single-receive calibration feed source, system noise is reduced and calibration accuracy is improved. The calibration feed source is used during radio satellite calibration; after calibration, it is replaced by a transmit / receive feed source to perform satellite telemetry and control tasks. The dual-feed source design eliminates the need for a cryogenic field amplifier, simplifying system complexity and reducing system cost. The calibration feed source and transmit / receive feed source of this device can be replaced in situ, resulting in a simple structure, strong operability, and ease of implementation.

Claims

1. A calibration and control device for a large-aperture antenna in the Ka band based on dual feed sources, characterized in that, The system includes an antenna (1), a feed horn, a field amplifier (3), a Ka / S downconverter (4), an S / 300M downconverter (5), a power amplifier (6), a 300M / Ka upconverter (7), an integrated baseband (8), a power probe (9), a calibration computer (10), an antenna control unit (11), and an antenna drive unit (12). The feed horn used for radio satellite calibration is the calibration feed horn (2-1), and the feed horn used for satellite telemetry and control is the transceiver feed horn (2-2). The calibration feed horn (2-1) and the transceiver feed horn (2-2) are installed in the same location. The calibration feed (2-1) and the transceiver feed (2-2) are used in a time-division manner. The antenna (1) and the feed are connected by a waveguide. When the radio satellite is calibrated, the antenna (1) receives the signal emitted by the radio satellite (13) and sends it to the calibration feed (2-1). The calibration feed (2-1) receives the signal sent by the antenna (1) and generates sum and difference signals to send to the field amplifier (3). When the satellite is being telemetry and control, the antenna (1) receives the signal emitted by the satellite (14) and sends it to the transceiver feed (2-2). At the same time, the antenna (1) receives the signal from the transceiver feed (2-2) and transmits it to the satellite (14). The transceiver feed (2-2) receives the signal sent by the antenna (1) and generates sum and difference signals to send to the field amplifier (3). At the same time, it radiates the signal sent by the power amplifier (6) to the antenna (1). The field amplifier (3) receives the signal from the calibration feed (2-1) or the transceiver feed (2-2), amplifies the signal, and sends it to the Ka / S downconverter (4). Ka / S downconverter (4) receives the Ka radio frequency signal from the field amplifier (3), and outputs the Ka radio frequency signal as an S radio frequency signal through the internal local oscillator and frequency conversion module, and transmits it to the S / 300M downconverter (5). The S / 300M downconverter (5) receives the S radio frequency signal from the Ka / S downconverter (4), and outputs the S radio frequency signal as a 300M intermediate frequency signal through the internal local oscillator and frequency conversion module. It is then divided into two paths: one path is sent to the integrated baseband (8), and the other path is sent to the power probe (9). The integrated baseband (8) receives the 300M intermediate frequency signal from the S / 300M downconverter (5), performs AD sampling and demodulation processing, completes the downlink data demodulation, and obtains the angle error signal, which is sent to the antenna control unit (11); at the same time, it performs data modulation and DA output to generate the uplink 300M intermediate frequency signal, which is sent to the 300M / Ka upconverter (7). The 300M / Ka upconverter (7) receives the 300M intermediate frequency signal from the integrated baseband (8), and outputs the 300M intermediate frequency signal as a Ka radio frequency signal through the internal local oscillator and frequency conversion module, and sends it to the power amplifier (6). The power amplifier (6) receives the Ka radio frequency signal from the 300M / Ka upconverter (7), amplifies it, and sends it to the transceiver feed (2-2). The power probe (9) is used during radio star calibration to receive the 300M intermediate frequency signal sent by the S / 300M downconverter (5), perform signal power detection, and send it to the calibration computer (10). The calibration computer (10) is used during radio star calibration. It receives the signal sent by the power probe (9), uses the calibration algorithm to obtain the angular error signal, and sends it to the antenna control unit (11). The antenna control unit (11) receives the angular error signal sent by the calibration computer (10) during radio satellite calibration, or receives the angular error signal sent by the integrated baseband (8) during satellite telemetry and control, and generates an antenna drive signal to send to the antenna drive unit (12). The antenna drive unit (12) receives the antenna drive signal sent by the antenna control unit (11) and controls the antenna (1) to rotate in azimuth and pitch to align with the radio star (13) or satellite (14). Radio satellite calibration and satellite telemetry and control use different links. The link equipment for radio satellite calibration includes antenna (1), calibration feed (2-1), field amplifier (3), Ka / S downconverter (4), S / 300M downconverter (5), power probe (9), calibration computer (10), antenna control unit (11), antenna drive unit (12), and radio satellite (13). The link equipment for satellite telemetry and control includes antenna (1), transceiver feed (2-2), field amplifier (3), Ka / S downconverter (4), S / 300M downconverter (5), integrated baseband (8), 300M / Ka upconverter (7), power amplifier (6), antenna control unit (11), antenna drive unit (12), and satellite (14).

Images