An Acquisition System with High Adaptability in Spread Spectrum Communication

Abstract

The invention provides a capture system with high adaptability in spread-spectrum communication and relates to the technical field of spread-spectrum communication. A bus decoder realizes communication between the capture system and a CPU; a clock generator generates two clocks according to setting of the CPU for being used by other modules in the capture system; a digital down converter carries out down conversion on a received signal to obtain a zero intermediate frequency complex signal; then the complex signal is fed into a down-sampling filter, sampling rate is reduced to two times of code rate, local code is also reduced to the two times of the code rate; then the complex signal is fed into a cache device I; after enough primary partial matched filtering data is cached, partial matched filtering and Fourier transformation are sequentially carried out; then incoherent integration is realized on a frequency domain result and data in a cache device III, peak threshold judgement is carried out after the incoherent integration is completed, and a judgement result is transmitted to the CPU by virtue of a bus. The capture system provided by the invention can realize pseudo code phases adapting to various environments in a satellite navigation system and two-dimensional capture of Doppler frequency offset.

Description

technical field [0001] The invention relates to the technical field of spread spectrum communication, in particular to a capture system with high adaptability in the spread spectrum communication of pseudo code phase and Doppler frequency offset which can adapt to various environments in a satellite navigation system. Background technique [0002] With the completion of my country's "Beidou-2" satellite navigation system, Beidou user machines have been widely used in all walks of life, so the application environment of navigation equipment is becoming more and more diverse and complex, and the demand for user machines tends to be diversified. For example, under the occlusion of various buildings, overpasses, and pedestrian passages in typical urban roads, and under various occlusion environments such as jungles and mountains, the user machine should have high-sensitivity receiving capabilities; such as precision-guided bombs, rockets, tactical missiles, launch For guided wea...

AI Technical Summary

Problems solved by technology

[0003] Existing technologies are aimed at specific environments and cannot adapt to different environments at the same time. Therefore, the present invention proposes a capture system with high adaptability in spread spectrum communication

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