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A kind of satellite signal acquisition method and device with multi-frame superposition
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A satellite signal acquisition and signal technology, applied in the field of satellite communications, can solve problems such as limited application scenarios and no substantial improvement, and achieve the effects of improving acquisition probability, acquisition capability, efficiency and bandwidth utilization.
Active Publication Date: 2022-07-22
四川安迪科技实业有限公司
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[0004] For example, the patent publication number: CN 103543456 A discloses a large frequency offset GNSS signal acquisition method based on segmented correlation combined with FFT operation. Through segmented correlation combined with FFT operation, the parallel search of the carrier frequency can be completed while the code phase is serially searched. Search can effectively shorten the acquisition time of GNSS signals with large frequency offset and improve the anti-frequency offset ability of acquisition, but the anti-noise ability of the system acquisition has not been substantially improved
[0005] For example, the patent publication number: CN 106685879 A discloses a multi-frame synchronization method based on IEEE802.11 protocol OFDM technology, which uses coarse synchronization frame header estimation, fine synchronization frame header estimation, and frame tail estimation to ensure capture Under the condition of performance, the requirements for fine synchronization frame header estimation are simplified, but the coarse synchronization frame header estimation is realized by the special frame structure of the system silent period, and its application scenarios are greatly limited
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Embodiment 1
[0034] After the satellite downlink signal is amplified, filtered, frequency-converted, analog-to-digital conversion, digital decimation, filtered, and time-processed by an analog device, a digital baseband signal with double the symbol rate is obtained, and enters the capture link. The capture method process in this example is as follows: figure 1 shown:
[0035] S1 de-modulation, using the known symbol of the preamble to perform complex conjugate multiplication operation on the received digital baseband signal with a double symbol rate to realize the de-modulation process, such as figure 2 A schematic diagram of the demodulation is shown.
[0036] S2 sliding window energy accumulation: the energy accumulation of the sliding window is performed on the de-modulated signal. The length of the sliding window is the length n of the preamble. The energy accumulation process is the accumulation of the symbol amplitude in the sliding window. The result of the accumulation in the sli...
Embodiment 2
[0049] like Figure 4As shown, the structural block diagram of the multi-frame superimposed satellite signal capture device provided in this example includes a demodulation unit, a sliding-window energy accumulation unit, a buffer unit, a multi-frame smoothing unit, and a peak-finding unit connected in sequence. The buffer unit is connected to multiple frame smoothing units in reverse at the same time.
[0050] For specific applications:
[0051] After the satellite downlink signal is amplified, filtered, frequency-converted, analog-to-digital conversion, digital decimation, filtered, and processed by the analog device, a digital baseband signal with double the symbol rate is obtained, and then enters the multi-frame superimposed satellite signal capture device, and multi-frame superimposed. The processing flow of the satellite signal acquisition device is as follows figure 1 shown:
[0052] First, the de-modulation unit performs complex conjugate multiplication operation o...
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Abstract
A satellite signal acquisition method and device for multi-frame superposition, the method comprises: performing complex conjugate multiplication operation on a received digital baseband signal and a known symbol of a preamble to realize demodulation; Calculate the energy value of the accumulated results, and generate N energy value results, where N is the symbol length of the physical frame; calculate the difference between the N energy values of the current physical frame and the N energy smoothing values of the historical physical frame, and calculate the difference value. After multiplying with an influence factor a, perform an accumulation operation with the previous calculation result to obtain N smooth accumulation results, and use the N smooth accumulation results as the N energy smoothing values of the new historical physical frame to form a first-order feedback loop Path structure; read out the energy smooth value of the smooth accumulation result, find the maximum value and the corresponding cache address, and determine the needle position. Reduce the preamble overhead, perform multi-frame stacking after de-modulation, and improve the anti-noise capability and acquisition probability of capture.
Description
technical field [0001] The present invention relates to satellite communication technology, in particular to a method and device for capturing satellite signals with multiple frames superimposed. Background technique [0002] The satellite link adopts the transparent forwarding method, and the satellite terminal can transmit and receive automatically. The acquisition capability of the satellite link is mainly determined by the length of the preamble of the physical frame. The longer the preamble, the higher the acquisition probability of the satellite signal, and the adaptive acquisition threshold The lower the value, the stronger the environmental adaptability of the satellite terminal; at the same time, the longer the length of the preamble, the greater the overhead of the physical frame, the less the payload transmitted per unit time, and the lower the bandwidth utilization of the satellite. [0003] In the field of existing satellite communication technology, there have ...
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