Carrier false lock performance for TDRS TT&amp;C transponder

Tsang, Chit-Sang

doi:10.1109/aero.1994.291184

Cited by 2 publications

(1 citation statement)

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“…First, the limited transmission power and long distance between the spacecraft and ground stations are likely to result in very low signal-to-noise ratio (SNR) signals for the receiver [1]. Moreover, the spacecraft's high-speed movement would bring severe Doppler frequency and Doppler frequency rate-of-change [3], making great difficulties for signal acquisition, demodulation and decoding without accurate orbit prediction [4]. How to actualise reliable reception under high-dynamic and low-SNR environment becomes a key problem for deep space communications.…”

Section: Introductionmentioning

confidence: 99%

Robust algorithm for high‐dynamic and low‐signal‐to‐noise ratio signal reception in deep space communications

et al. 2013

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In deep space communications, the received signals are always highly dynamic and very weak, which makes it quite challenging to achieve reliable data reception. To tackle these problems, a robust algorithm which joins tracking and code-aided synchronisation is proposed in this study. The frequency lock loop-assisted phase lock loop is used as the tracking loop, which integrates the characteristics of both outstanding dynamic performance and precise measurement. The code-aided synchronisation is adopted as the demodulation and decoding loop, which utilises the relationship among the coded symbols to assist signal demodulation under the low signal-to-noise ratio condition. It is worth pointing out that the power tradeoff between the main carrier and subcarrier signals which operate in the two loops mentioned above is also optimised to minimise the total transmitting power. Simulation results showed that the proposed scheme with code rate 1/5 low-density parity-check codes could almost eliminate the effect of these factors, with the excellent performance, which closely approximates the ideal decoder in additive white Gaussian noise channel.

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Section: Introductionmentioning

confidence: 99%

Robust algorithm for high‐dynamic and low‐signal‐to‐noise ratio signal reception in deep space communications

et al. 2013

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A new algorithm for main carrier acquisition in deep space communications

Zhang

Zhan

2011

J. Electron.(China)

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Compared with common near space satellite Telemetry, Telecommand, and Communication (TT&C), deep space TT&C presents a more challenging environment such as long distance, very low Signal to Noise Ratio (SNR). How to acquire main carrier exactly becomes a hot focus for deep space communications. Already there emerged some main carrier acquisition algorithms, but they all require high SNR and small modulation index. In this paper, we develop a new acquire algorithm. First we use the spectral energy center algorithm to shorten the original sequence, filter out some noise and make the spectral more symmetric. Then we adopt the spectral symmetry algorithm to make full use of the whole spectrum information, and utilize FFT to reduce computation complexity. Simulation results show that our algorithm can acquire main carrier successfully under large modulation index and get good performance with low Carrier to Noise Ratio (CNR).

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Carrier false lock performance for TDRS TT&C transponder

Cited by 2 publications

References 0 publications

Robust algorithm for high‐dynamic and low‐signal‐to‐noise ratio signal reception in deep space communications

Robust algorithm for high‐dynamic and low‐signal‐to‐noise ratio signal reception in deep space communications

A new algorithm for main carrier acquisition in deep space communications

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