Low-orbit satellite carrier monitoring system
Release date:
With the large-scale deployment of global low-Earth-orbit broadband satellites, an increasing number of satellites are crowding into the limited orbital and frequency resources. Low-Earth-orbit broadband satellites differ significantly from traditional geostationary satellites in terms of satellite quantity, orbital altitude, and relative velocity with respect to Earth.
Low-Earth-orbit broadband satellites typically operate at altitudes of over 1,000 kilometers and complete one orbit around the Earth in just a few dozen minutes. As a result, these satellites are moving at high speeds relative to the Earth, and each satellite’s pass over any given ground station is very brief—usually lasting only a few minutes. This poses significant challenges for signal monitoring at ground stations. Meanwhile, the number of potential interference sources on the ground is steadily increasing. The further deployment of 5G NR base stations and the coexistence of radars operating across multiple frequency bands both place extremely high demands on satellite signal monitoring. To ensure the quality of satellite signal services and maintain the normal operation of service equipment, it is essential to conduct round-the-clock, 24/7 signal monitoring of satellite signals.
This carrier monitoring product is a network-port-based real-time spectrum analyzer featuring direct bandwidth acquisition and multi-channel fully parallel processing. It can perform real-time spectrum monitoring and analysis of eight 1-GHz bandwidth signals, with a frequency resolution as low as 1 Hz. Its interference identification accuracy exceeds 90% (with a signal-to-noise ratio ≥ 6 dB), and it boasts high-precision task analysis capabilities.
Performance metrics
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Monitoring signal intermediate frequency input range: L-band: 1.6 GHz ± 500 MHz; S-band: Uplink 2.025–2.125 GHz, Downlink 2.2–2.3 GHz.
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Bandwidth utilization accuracy within the frequency band: ≤ 5% |
| Number of parallel channels ≥ 8; the number of signal channels that can be monitored simultaneously is no less than 8. | Total power within the frequency band, peak level accuracy: ≤ 1 dB |
| Minimum input power: DANL < -130 dBm | Carrier center frequency accuracy: ≤ Carrier symbol rate × 5% |
| Maximum input power: 10 dBm or higher | Carrier (C+N)/N, Level accuracy: ≤ 1 dB |
| Spurious: ≤ -50 dBc | Carrier-3dB bandwidth accuracy: ≤ Carrier symbol rate × 10% |
| Level accuracy: ≤1 dB | Carrier signal anomaly detection time: ≤ 3s |
| Frequency resolution: minimum 1 Hz (analysis bandwidth 20 MHz) | Interference detection time: ≤ 3s |
| Scan speed: 1 GHz (RBW = 15 kHz) < 10 s, number of points ≥ 10,000. | Interference detection rate: Better than 80% (signal-to-noise ratio ≥ 6 dB) |
| Bandwidth analysis measurement time: < 1 second | Storage of spectrum, measurement data, and alarm duration: ≥14 days |
| Carrier analysis measurement time: < 1 second |
This product consists primarily of an integrated broadband receiver module, a baseband signal processing unit XCZU47DR, and a DDR memory module. Specifically, the baseband receiver module performs downconversion and AD sampling of the intermediate-frequency input signal. The baseband processing unit serves as the core module for signal processing and system control, performing functions such as I/Q data acquisition, FFT processing, and signal analysis. The advantage of this solution lies in its ability to meet the design requirements for wideband monitoring and high-performance processing by leveraging the highly integrated XCZU47DR development chip, resulting in a compact size, high performance, and low power consumption.
Some of the features are as follows:
Supports signal analysis and statistical capabilities for spectrum data, as well as automatic frequency-domain parameter measurement. By measuring indicative frequency-domain characteristic parameters, it enables quantitative assessment of the operational status of frequency bands, carriers, and beacons, facilitating data statistics, trend generation, and analysis. It also supports the following analysis modes:
· Carrier analysis mode, obtaining: carrier center frequency, -3dB bandwidth, ERIP, C/N, and occupied bandwidth.
· Frequency band analysis mode, providing: total power, maximum level, minimum level, occupied bandwidth, and occupancy rate.
· Beacon measurement: Obtain beacon ERIP and beacon frequency;
· Automatic carrier identification mode, obtaining information on each carrier;
· Supports the capability of concurrent, high-speed acquisition of broadband carrier signal spectra via multiple channels on a single device.
It has the capability to automatically identify signal interference on feed links. For carrier interference, it employs high-precision carrier identification and, combined with the carrier schedule, detects interference affecting the carrier.
· Carrier analysis mode, obtaining: carrier center frequency, -3dB bandwidth, ERIP, C/N, and occupied bandwidth.
· Frequency band analysis mode, providing: total power, maximum level, minimum level, occupied bandwidth, and occupancy rate.
· Beacon measurement: Obtain beacon ERIP and beacon frequency;
· Automatic carrier identification mode, obtaining information on each carrier;
· Supports the capability of concurrent, high-speed acquisition of broadband carrier signal spectra via multiple channels on a single device.
It has the capability to automatically identify signal interference on feed links. For carrier interference, it employs high-precision carrier identification and, combined with the carrier schedule, detects interference affecting the carrier.
Diagram of the actual application scenario for carrier monitoring equipment
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Video demonstration
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