A high dynamic wide range fast signal acquisition method suitable for deep space communication
A fast signal and deep space communication technology, applied in the field of deep space communication, can solve the problems of long capture time, complex engineering implementation, and high resource consumption, and achieve fast and high-precision implementation, low implementation complexity, and the same simulation performance.
Active Publication Date: 2019-12-10
SHANGHAI RADIO EQUIP RES INST
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The carrier capture algorithm in the microwave unified measurement and control system based on convolution calculation performs convolution calculation on the down-converted baseband signal and its own signal, and realizes carrier capture by finding the maximum point of the convolution operation and mapping it. This algorithm uses multiple FFT, inverse FFT calculation and mapping algorithm, the calculation is relatively complicated, and the engineering implementation complexity is high
[0005] Therefore, the conventional high dynamic wide range capture method takes a long time to capture, consumes a lot of resources, has low frequency capture accuracy, and complex engineering implementation
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[0030] Hereinafter, in conjunction with the accompanying drawings, a preferred embodiment is described in detail to further illustrate the present invention.
[0031] Such as figure 1 As shown, the present invention discloses a high dynamic wide range fast signal capture method suitable for deep space communication. The method is based on the residual carrier BPSK modulation signal of the communication system, the communication rate is 2kbps, and the Doppler frequency deviation range is ±500kHz , The maximum Doppler frequency change rate is 30kHz / s, the high dynamic wide range fast signal capture includes the following steps: S1, the ±500kHz Doppler frequency deviation is divided into 16 search sub-intervals at equal intervals, figure 2 Among them, the sub-interval number is identified by n, and each sub-interval performs frequency search independently; each sub-interval is set with a different center frequency, so that different sub-intervals have different frequency offset freq_...
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The present invention discloses a high-dynamic wide-range fast signal capture method for deep space communication. The method includes the following steps that: S1, Doppler frequency offset of 500 kHz is divided into 16 search subintervals with equal intervals, wherein each subinterval independently performs frequency search; different center frequencies are set for each subinterval, so that different subintervals have different frequency offset, an FFT (fast Fourier transform) spectrum analysis method is adopted to perform frequency search on the 16 search subintervals, the maximum value of the FFT result and a frequency value corresponding to the maximum value of each subinterval are calculated, and a maximum value is found out from the maximum values of the FFT results of the 16 search subintervals; and S2, a frequency value corresponding to the maximum value found out in the maximum values of the FFT results of the 16 search subintervals is added with interval frequency offset, so that an obtained result is captured Doppler frequency offset. With the high-dynamic wide-range fast signal capture method for deep space communication of the invention adopted, high-dynamic wide-range signal capture can be obtained fast in a high-precision manner, and resource consumption is not increased.
Description
Technical field [0001] The invention relates to a signal capture technology in the field of deep space communication, and in particular to a high dynamic wide range fast signal capture method suitable for deep space communication. Background technique [0002] In deep-space communication, because spacecraft has high speed and acceleration during operation, and the long-distance communication path loss is large, the received signal is a weak signal with a large Doppler shift and frequency change rate. [0003] The deep-space frequency acquisition algorithm based on two-dimensional partition divides the Doppler frequency offset into N search intervals, called N channels, each channel NCO is preset to the center frequency of the frequency search interval; each channel is divided into M Each group of NCO is preset to the step value of the Doppler frequency change rate generated at a certain interval. In this way, a two-dimensional search plane of Doppler frequency deviation and Dopple...
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IPC IPC(8): H04L27/00
CPCH04L27/0014H04L2027/0026
Inventor 董国英费聚锋李名祺王召利
Owner SHANGHAI RADIO EQUIP RES INST