Method and device used for processing signal of base band of high dynamic satellite navigation receiver

Abstract

The invention discloses a processing method and apparatus used for high dynamic satellite navigation receiver baseband signal. The process of the satellite navigation receiver baseband signal is finished via the separated and parallel trapped engine and the tracing channel under the control of upper machine. When it comes to operation, the intermediate frequency signal enters the trapped engine and the tracing channel by mapping sample: the whole Doppler frequency domain parallel trapped algorithm is finished in the trapped engine, generates the local code sequence aligning with the phase of input signal sequence and transfer it to the tracing channel; in the tracing channel, the signal is accumulated timely and extracted, the bit quantity of the telex information, the monitoring quantity of the sheet deviation and the launching temporal information are provided to the upper machine; after the tracing channel losing lock, the trapped engine recaptures the signal. The invention adopts two-dimensional parallel search to accelerate the trapped speed; the trapped engine duplicates the FFT arithmetic unit, envelope arithmetic unit and detector and saves the resource; the module parameter design is fit for different system and scale.

Description

technical field [0001] The invention relates to a method and device for baseband signal processing of a high dynamic satellite navigation receiver. Background technique [0002] High dynamic satellite navigation receiver is a high-end technology in military, aerospace and other application fields. At present, my country's application development in this field is in its infancy. The developed high-dynamic receiver is mainly based on the GPS system. Considering that the GPS system is controlled by the US military and its safety cannot be guaranteed, my country is actively developing independent systems (such as the Beidou satellite navigation system) and other systems (such as the Sino-European cooperation system). The Galileo satellite navigation system and Russia's GLONASS satellite navigation system) carry out research and development of high dynamic navigation receivers. In addition, even in the satellite navigation receiver market for medium and low dynamic applications, ...

AI Technical Summary

Problems solved by technology

This kind of two-dimensional serial search in the uncertain range of carrier frequency and code phase takes a lot of time

At the same time, in a high dynamic environment, there is a large Doppler frequency shift, and because of the acceleration and jerk, the frequency offset changes very quickly. If a general PLL loop is used for frequency offset capture, no matter Neither the capture bandwidth nor the capture speed can meet the requirements

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