Multi-Channel Satellite Communication Measurement and Control System
Product Introduction
This system is a high-performance satellite communication measurement and control system, specifically designed to meet stringent demands for high precision and high reliability. It supports S-band Telecommand (TC), Telemetry (TM), Ranging and Ranging Rate Measurement (RRM), as well as Ka-band High-Speed Data Link processing, providing complete functionality for forward signal transmission and return signal access.
The system offers flexible operational modes, supporting various schemes such as Direct Sequence Spread Spectrum (DSSS), standard Unified S-Band (USB), and high-speed data transmission. It allows for rapid switching and configuration via host computer software, and integrates a telemetry simulator and comprehensive link self-test functionality.
The system strictly adheres to CCSDS (Consultative Committee for Space Data Systems) protocols and supports multiple channel encoding methods to ensure international compatibility. The hardware employs a PXIe modular architecture, integrating core modules such as Intermediate Frequency (IF) processing, FPGA, and network communication. It combines high reliability, real-time performance, and a user-friendly interface to provide comprehensive support for various aerospace measurement and control missions.
Product Features:
1. Telemetry processing
▣ Demodulation & Code Formatso：
- Supports NRZ-L/M/S code formats and various modulation schemes including BPSK, QPSK, DQPSK, OQPSK, UQPSK, PCM-CDMA-BPSK, and PCM-BPSK, with provision for future upgrades.
▣ Data Rate & Descrambling：
- Information symbol rate up to 600 kbps (supports a range of 5 kbps to 24 Mbps with auto-detection capability).
- Features configurable descrambling (polynomial, initial phase, starting position).
▣ Error Statistics & Frame Format
- Supports real-time Bit Error Rate (BER) statistics; BER degradation ≤ 1 dB.
- Maximum frame length of 32,000 bytes.
- Synchronizer word length adjustable from 8 to 128 bits.
- Configurable synchronization strategy (fault tolerance, verification, frame protection count).
▣ Channel Decoding
- Supports Viterbi, R-S, and LDPC decoding (code rates 7/8, 1/2; separate/combined paths).
- Compliant with CCSDS standards and expandable for other decoding methods.
▣ Monitoring & Storage
- Real-time display and recording of frame sync, bit sync, and PLL lock status.
- Supports virtual channel multiplexing and frame counting.
- Provides real-time streaming data storage to disk and post-event playback capability (including playback in non-demodulated mode).
2. Distance measurement and speed measurement
▣ Scheme & Code Formats
- Supports NRZ-L/M/S code formats, pseudo-code ranging, ESA, and non-coherent ranging, with both coherent and non-coherent spread spectrum ranging capabilities.
▣ Data Rate & Multi-Channel
- Code rate meets 1000 bps; spread spectrum code rate supports 1.023M × n (n=1~10) chip/s.
- Supports single-channel or multi-channel (≥ 4 channels) ranging, with independent output of ranging tones and local ranging capability.
▣ Accuracy & Measurement
- Ranging accuracy up to σR ≤ 1 m (pseudo-code ranging), with a resolution of 1 ns; automatically calculates mean and variance.
- Ranging rate accuracy σṘ ≤ 2 cm/s.
- Sampling rate supports 1/3 Hz to 20 Hz; features Doppler compensation.
▣ Tones & Ambiguity Resolution
- Supports independent setting of ranging tone modulation index and main/auxiliary tone lengths.
- Features phase ambiguity resolution and automatic statistical functions.
3. Remote control generation
▣ Tones & Ambiguity Resolution
- Modulation & Code Formats.
▣ Data Rate & Spread Spectrum
- Telecommand symbol rate up to 1 Mbps (range: 1 kbps to 1 Mbps, step size: 1 bps).
- Spread spectrum code rate accuracy < 0.01 chip. Supports Gold codes, m-sequences, etc., with code lengths including 1023, 2047, and 261888.
▣ Channel Encoding
- Supports convolutional, R-S, and LDPC encoding compliant with CCSDS standards, and is expandable for other encoding methods.
▣ Commanding & Verification
- Supports local/remote command transmission. Command length ≤ 30 kBytes; preamble and idle sequences are programmable.
- Features loopback demodulation comparison, signal on/off control, and power level adjustment (range ≥ 20 dB, precision 0.1 dB).
4. Telemetry simulation
▣ Data Source & Code Formats
- Data sources include preset files, local playback files, and network reception. Supports NRZ-L/M/S code formats.
▣ Data Rate & File Handling
- Symbol rate up to 10 Mbps (range: 1 kbps to 1 Mbps, step size: 1 bps).
- Maximum supported file size: 32,768 bytes (preset mode) or 500 MB (playback mode).
▣ Processing & Monitoring
- Frame format is consistent with demodulation processing; features CRC check, scrambling, and channel encoding.
- Supports automatic Bit Error Rate (BER) calculation with real-time display, telemetry quick-look, and local storage.
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