A high-performance acquisition method for navigation satellite inter-satellite link wireless long-period spread spectrum code signals

Abstract

The invention provides a high-performance capturing method of a wireless long-time cycle spreading code signal of a navigation satellite inter-satellite link. The high-performance capturing method comprises steps of: S1: carrying out orthogonal down conversion on a middle-frequency reception signal; S2: carrying out continuous data buffering on an I / Q signal; S3: carrying out parallel correlator operation on local multi-path spreading code signals after "a segment" of the I / Q signal is fully filled; S4: carrying out coherent accumulation on operation results and then storing the obtained result into "coherent integration buffer"; S5: after the "coherent integration buffer" is fully filled, returning to the step S3, and processing the next segment of the I / Q signal; S6: after the "coherent integration" is finished, carrying out modulo and square operation on the coherent integration results, carrying out incoherent accumulation on the results and then stored the obtained result into the "incoherent integration buffer" until the whole buffer cache is fully filled; and S7: after the "incoherent integration" is finished, carrying out peak value detection on integration detection results representing different phase positions in the incoherent integration buffer and judging whether the capturing is successful or not. According to the invention, resource use rate of time domain capturing can be remarkably increased and requirements on resource storage are greatly reduced.

Description

technical field [0001] The invention mainly relates to the technical field of wireless communication and measurement, in particular to a high-performance acquisition method suitable for navigation satellite inter-satellite link wireless long-period spread spectrum code signals. Background technique [0002] The Global Navigation Satellite System (GNSS) can provide all-weather precise position and time information for any place in the earth and near-Earth space. In the global satellite navigation system, maintaining high satellite orbit determination accuracy and clock error determination accuracy is the key to ensure that the navigation receiving terminal obtains the positioning or timing accuracy required by the large system. [0003] The demand for inter-satellite ranging function for precise orbit determination and time synchronization of navigation satellites gave birth to the concept of navigation constellation inter-satellite link. Once the link is established between...

AI Technical Summary

Problems solved by technology

Compared with the time-domain processing algorithm, the frequency-domain processing algorithm involves FFT operation, which is complicated to implement, especially for the space-borne FPGA resource consumption is large, and the calculation cost-effectiveness ratio is lower than that of the time-domain processing algorithm in the case of limited area search.

In addition, frequency domain processing algorithms often can only rely on long-term "non-coherent integration" to improve processing gain, which will seriously affect the capture speed under weak signal conditions

Therefore, the current frequency domain processing algorithm is not suitable for the fast acquisition of weak long code signals

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