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A satellite communication burst acquisition method
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A technology of satellite communication and burst signal, which is applied in the field of satellite communication, can solve the problem of false alarm or missed detection of the signal-to-noise ratio of the received signal, and achieve the effect of capturing a low false alarm rate
Active Publication Date: 2018-09-11
成都国恒空间技术工程股份有限公司
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Problems solved by technology
This technology can adapt to the situation of large differences in received signal power, but there are false alarms or missed detections when the signal-to-noise ratio of the received signal is low
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Embodiment 1
[0033] Such as figure 2 As shown, a satellite communication burst acquisition method, comprising:
[0034] Step 1: Obtain a received signal sequence.
[0035] Step 2: Perform training calculation on the received signal sequence and the local known unique code sequence, and output the calculation result.
[0036] The known unique code sequence is stored in a local memory.
[0037] The method for training and calculating the received signal sequence and the known unique code sequence is:
[0038]
[0039]
[0040] In the formula: u(k) represents the calculation result, x k Represents the demodulated baseband signal sequence, r k Indicates the received signal sequence, c k Represents the known unique code sequence after normalization, L represents the length of the known unique code sequence, and p represents a constant factor. The value of p is related to the capture performance, and the value of p can be selected according to the actual application. The larger the ...
Embodiment 2
[0060] The difference between the technical solution of this embodiment and Embodiment 1 is that in this embodiment, the training calculation of the received signal sequence and the known unique code sequence is performed later than the calculation of the adaptive threshold based on the received signal sequence.
Embodiment 3
[0062] The difference between the technical solution of this embodiment and the first embodiment is that in this embodiment, the training calculation of the received signal sequence and the known unique code sequence and the calculation of the adaptive threshold according to the received signal sequence are performed simultaneously.
[0063] Such as Figure 4 Shown, a kind of application system of satellite communication burst acquisition method, comprises:
[0064] A received signal sequence obtaining unit, configured to obtain a received signal sequence;
[0065] a storage unit for storing known unique code sequences;
[0066] A training operation unit, configured to perform training calculation on the received signal sequence and the known unique code sequence, and output the calculation result;
[0067] a threshold computing unit, configured to solve the adaptive threshold according to the received signal sequence, and output the capture threshold;
[0068] A signal det...
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Abstract
The invention discloses a satellite communication burst capturing method. The method of one embodiment comprises steps: a received signal sequence is acquired; training calculation is carried out on the received signal sequence and the already-known unique code sequence, and a calculation result is outputted; an adaptive threshold is solved according to the received signal sequence, and a capturing threshold is outputted; appearing and disappearing of burst signals are detected according to the received signal sequence, and a burst signal detection result is outputted; and according to the calculation result, the capturing threshold and the burst signal detection result, whether the burst signals are captured is judged, and if yes, a capturing identifier is outputted. Burst signals with large frequency deviation and large signal power difference can be accurately captured, and the false-alarm probability in the case of a low signal-to-noise ratio is extremely low.
Description
technical field [0001] The invention relates to the technical field of time-division multiple access satellite communication, in particular to a satellite communication burst acquisition method. Background technique [0002] Time Division Multiple Access (TDMA) satellite communication system uses burst mode communication. The performance of the burst capture module at the receiving end directly determines the performance of the TDMA system, and even determines whether the TDMA system can communicate. [0003] In the time division multiple access satellite communication system, due to the influence of channel fading, clock independence of transceiver sites, relative motion between the ground station and the satellite, and clock independence between ground stations, the receiving end passes through a low-noise modular down-converter ( The signal after LNB) down-conversion has a large frequency deviation (the frequency deviation can even reach 1 / 3 of the symbol rate), and a lo...
Claims
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