Remote sensing satellite data transmission subsystem based on multi-stage noise suppression

Abstract

A remote sensing satellite data transmission subsystem based on multi-stage noise suppression comprises a data transmission integrated intelligent terminal, a multi-stage high-suppression-performance channel filter, an adjustable suppression degree phased array antenna, power supply and control equipment; the signal output by the data transmission integrated intelligent terminal is transmitted through the adjustable suppression degree phased array antenna after being filtered by the multi-stage high-suppression-performance channel filter; the power supply and control equipment is used for power supply and data transmission with the data transmission integrated intelligent terminal and the adjustable suppression degree phased array antenna respectively; the multi-stage high-suppression-performance channel filter suppresses the sensitive frequency band of the data transmission subsystem through its own multi-stage coaxial cavity and tuning screw; the adjustable suppression degree phased array antenna suppresses the sensitive frequency band of the data transmission subsystem by setting resonators in its own filtering module.

Description

Technical Field

[0001] This invention relates to a remote sensing satellite data transmission subsystem based on multi-level noise suppression, belonging to the field of electromagnetic compatibility technology. Background Technology

[0002] With the increasing demand for miniaturization and integration of satellites, satellite platforms are carrying more diverse payloads. However, the miniaturization requirements lead to electromagnetic interference (EMI) within or between different payload subsystems. Intra-system EMI can cause abnormal data processing by individual units, while inter-system EMI can affect the normal reception of receiving equipment. Severe EMI can lead to errors in the output data of individual units and even malfunction of receiving equipment.

[0003] During the design of a remote sensing satellite data transmission subsystem, the hardware configuration of each unit within the system was determined based on the satellite's functional requirements. In the overall satellite layout, the closest distance between the data transmission subsystem's transmitting antenna and the payload receiving antenna is 500mm. The radio frequency signal output by the transmitting antenna causes electromagnetic interference to the sensitive frequency band of the payload antenna. Therefore, the data transmission subsystem needs to mitigate electromagnetic interference through system-level electromagnetic compatibility design. Summary of the Invention

[0004] The technical problem to be solved by this invention is to overcome the shortcomings of the prior art and solve the problem of electromagnetic interference between the transmitting antenna of the data transmission subsystem and the receiving antenna of the adjacent load.

[0005] The objective of this invention is achieved through the following technical solutions:

[0006] A remote sensing satellite data transmission subsystem based on multi-level noise suppression includes an integrated data transmission intelligent terminal, a multi-order high-suppression channel filter, an adjustable suppression phased array antenna, and power supply and control equipment.

[0007] The signal output by the integrated data transmission intelligent terminal is transmitted through an adjustable suppression phased array antenna after passing through a multi-stage high-suppression channel filter.

[0008] The power supply and control equipment is used for power supply and transmits data to the integrated data transmission intelligent terminal and the adjustable suppression phased array antenna, respectively.

[0009] The multi-stage high-suppression channel filter suppresses the sensitive frequency bands of the data transmission subsystem through its own multi-stage coaxial cavity and tuning screw;

[0010] Adjustable suppression phased array antennas suppress sensitive frequency bands of data transmission subsystems by setting resonators in their own filtering modules.

[0011] Compared with the prior art, the present invention has the following advantages:

[0012] (1) The present invention uses a multi-stage high-suppression channel filter, which can be adjusted according to the system's operating frequency band and the frequency points of concern for suppression, to perform preliminary optimization of the radio frequency signal.

[0013] (2) The present invention uses an adjustable suppression parameter phased array antenna to further optimize the characteristics of the amplified radio frequency signal inside the antenna, so as to ensure that the suppression degree of the suppression band meets the electromagnetic compatibility requirements.

[0014] (3) The system of the present invention can adjust the single-machine indicators according to the specific use scenario, and has a wider range of applications. Attached Figure Description

[0015] Figure 1 This is a block diagram of the data transmission subsystem of the present invention.

[0016] Figure 2 This is a simulation model of the multi-stage coaxial cavity of the present invention.

[0017] Figure 3 The results of load-sensitive frequency band suppression for multi-stage coaxial cavities simulated using HFSS.

[0018] Figure 4 This is a simulation model of the resonator in the filtering module of this invention.

[0019] Figure 5 The results of load-sensitive frequency band suppression for the resonator in the filtering module are simulated using HFSS.

[0020] Figure 6 This is a block diagram for testing the out-of-band noise power spectrum of the system in the wired state according to the present invention.

[0021] Figure 7 This is a measured noise power spectrum diagram of the system of the present invention in the load-sensitive frequency band. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0023] like Figure 1 As shown, a remote sensing satellite data transmission subsystem based on multi-level noise suppression includes an integrated data transmission intelligent terminal, a multi-order high-suppression channel filter, an adjustable suppression phased array antenna, and power supply and control equipment.

[0024] like Figure 2As shown, a simulation model of a multi-order high-suppression channel filter is presented. The multi-order high-suppression channel filter consists of an SMA connector, a multi-order coaxial cavity, and tuning screws. The SMA connector is installed at the input and output terminals of the multi-order coaxial cavity, and the tuning screws are mounted on the multi-order coaxial cavity. This example uses an eighth-order design with a BOX topology. The RF signal transmission flow is changed from the original:

[0025] Input → Cavity 1 → Cavity 2 → Cavity 3 → … Cavity 6 → Cavity 7 → Cavity 8 → Output

[0026] Improved to:

[0027]

[0028] This improvement significantly enhances the suppression of load-sensitive frequency bands. The RF signal input / output connector type is SMA-K, with each square cavity measuring 18mm × 18mm and a height of 12mm; the resonant rod diameter is 5.4mm; and the entire channel is equipped with 16 tuning screws, each with a diameter of 3mm.

[0029] like Figure 3 As shown in the simulation, the RF signal output by the integrated data transmission intelligent terminal is suppressed by >70dB in the sensitive frequency band of the load subsystem (8.5–10.5GHz) by a multi-order high-suppression channel filter. The power spectral density of the integrated data transmission intelligent terminal output is -90dBm / Hz, and after suppression by the multi-order high-suppression channel filter, the power spectral density at the filter output is -160dBm / Hz.

[0030] The signal output after the radio frequency signal is split and internally amplified by the adjustable suppression phased array antenna has a noise power spectral density of -123 dBm / Hz in the sensitive frequency band.

[0031] like Figure 4 As shown, each channel of the filter module in the adjustable suppression phased array antenna design contains a resonator. In this example, the resonator adopts an octagonal prism design with a total of 5 cavities, and the input and output RF interfaces use SMP connectors. In this example, the resonant cavity height is 60mm and the diameter is 11.6mm; the resonant rod diameter is 3.6mm; and a total of 7 tuning screws are set in the entire channel, each with a diameter of 3mm.

[0032] like Figure 5 As shown, the passing RF signal is filtered by the resonator in the simulation filtering module, and the suppression in the sensitive frequency band of the load subsystem, 8.5-10.5GHz, is >25dB.

[0033] The combined gain of the 39 elements of the adjustable suppression phased array antenna is 16dB. Therefore, the noise power spectral density of the antenna array in the sensitive frequency band of the load subsystem, 8.5 to 10.5 GHz, is -132dBm / Hz.

[0034] like Figure 6 As shown, the noise power spectral density of the data transmission subsystem in the sensitive frequency band of the load subsystem, 8.5–10.5 GHz, was measured. During the measurement, the data simulation source could output the baseband signal according to the actual input protocol of the front-end signal. The integrated intelligent terminal of data transmission processed the signal, and the output radio frequency signal after processing was filtered by a multi-stage high-suppression channel filter. The filtered signal was then tested by a spectrum analyzer.

[0035] The integrated data transmission intelligent terminal is powered, controlled by power supply and control equipment, and performs telemetry analysis.

[0036] like Figure 7 As shown, the noise power spectral density of the data transmission subsystem output signal in the sensitive frequency band of the load subsystem, 8.5–10.5 GHz, can reach -151.8 dBm / Hz.

[0037] The measured noise power spectrum of the adjustable suppression phased array antenna in the load-sensitive frequency band 8.5–10.5 GHz is ≤-145 dBm / Hz. Combined with the spatial isolation of 45 dB between the phased array antenna and the load receiving antenna in the data transmission subsystem, and after the data transmission subsystem uses a multi-order high-suppression channel filter and an adjustable suppression phased array antenna, the noise power spectral density at the receiving frequency band at the load receiving antenna meets the requirement of -174 dBm / Hz.

[0038] The contents not described in detail in this specification are common knowledge to those skilled in the art.

[0039] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solutions of the present invention by utilizing the methods and techniques disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the protection scope of the technical solutions of the present invention.

Claims

1. A remote sensing satellite data transmission subsystem based on multi-level noise suppression, characterized in that, This includes integrated data transmission intelligent terminals, multi-stage high-suppression channel filters, adjustable suppression phased array antennas, power supply and control equipment; The signal output by the integrated data transmission intelligent terminal is transmitted through an adjustable suppression phased array antenna after passing through a multi-stage high-suppression channel filter. The power supply and control equipment is used for power supply and transmits data to the integrated data transmission intelligent terminal and the adjustable suppression phased array antenna, respectively. The multi-stage high-suppression channel filter suppresses the sensitive frequency bands of the data transmission subsystem through its own multi-stage coaxial cavity and tuning screw; Adjustable suppression phased array antennas suppress sensitive frequency bands of data transmission subsystems by setting resonators in their own filtering modules; The multi-order high-suppression channel filter adopts a BOX topology and an eighth-order design. The RF signal transmission flow is as follows: The multi-stage high-suppression channel filter suppresses the radio frequency signal output by the integrated data transmission intelligent terminal by >70dB in the sensitive frequency band of the load subsystem, 8.5~10.5GHz; Each channel of the filter module in the adjustable suppression phased array antenna contains a resonator; The resonator adopts an octagonal prism design and has a total of 5 cavities.

2. The remote sensing satellite data transmission subsystem according to claim 1, characterized in that, The multi-stage high-suppression channel filter adopts multiple square cavity forms and is equipped with multiple tuning screws.

3. The remote sensing satellite data transmission subsystem according to claim 1, characterized in that, The resonator in the filtering module filters the passing radio frequency signal, achieving a suppression of >25dB in the sensitive frequency band of the load subsystem, 8.5~10.5GHz.

4. The remote sensing satellite data transmission subsystem according to claim 1, characterized in that, The noise power spectral density of the data transmission subsystem output signal can reach -151.8 dBm / Hz in the sensitive frequency band of the load subsystem, 8.5~10.5 GHz.

5. The remote sensing satellite data transmission subsystem according to claim 1, characterized in that, The adjustable suppression phased array antenna has a noise power spectrum of ≤-145dBm / Hz in the load-sensitive frequency band of 8.5~10.5GHz. Combined with the spatial isolation of 45dB between the phased array antenna and the load receiving antenna in the data transmission subsystem, and after the data transmission subsystem uses a multi-order high suppression performance channel filter and an adjustable suppression phased array antenna, the noise power spectrum density at the receiving frequency band at the load receiving antenna meets the requirement of -174dBm / Hz.

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