Multi-dimensional fast acquisition method and system for satellite signals

Abstract

The invention discloses a multi-dimensional fast acquisition method and system for satellite signals. The acquisition system comprises a digital intermediate frequency mixer, a local code generator, a partial matching filter (PMF), a fast Fourier transform (FFT) module, an acquisition detection module, an acquisition verification module and an acquisition judgment module; the technical problems of limited detection frequency offset range, high hardware implementation complexity, long processing delay and the like a satellite signal acquisition algorithm under a high dynamic environment can be solved via the algorithms of frequency adaptive adjustment, partial matching filter, fast Fourier transform and the like; the method and the system have the remarkable advantages of simple structure, low technical implementation complexity, short processing delay, large detection frequency offset range and the like, wherein the detectable Doppler frequency shift range is + / - 50 KHz, the Doppler frequency change rate is + / - 50 Hz, stable reception of radio communication under the extremely high dynamic environment having the flight speed of 20Ma and the acceleration of 180g can thus be realized, and the acquisition tracking time is less than 100ms.

Description

technical field [0001] The invention relates to a signal acquisition technology, in particular to a multi-dimensional fast acquisition method and system for satellite signals, and belongs to the field of satellite application technology. Background technique [0002] With the rapid development of satellite technology, the number of space vehicles is increasing rapidly, and the demand for satellite communication is increasing. Due to the limitations of antenna gain, platform scale, and relative movement of transceivers, the communication parties are often in high dynamics and low signal-to-noise ratio. In a high dynamic and low SNR environment, traditional synchronization techniques perform poorly under low SNR and high dynamic communication conditions, and may even lead to mission failure. This is because the high dynamic environment means a large Doppler frequency shift, which has often exceeded the capture band of the traditional carrier phase-locked loop. Therefore, the t...

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Problems solved by technology

[0005] The main purpose of the present invention is to overcome the deficiencies in the prior art and provide a multi-dimensional fast satellite signal acquisition method and system, which can solve the problem of limited detection frequency offset range of satellite signal acquisition algorithm in a high dynamic environment, high hardware implementation complexity, and processing problems. Time extension and other technical problems, to achieve efficient and fast capture of satellite signals

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