Real-time delay Doppler mapping data generator of non-uniform chip

Abstract

The invention discloses a real-time delay Doppler mapping data generator of a non-uniform chip. The real-time delay Doppler mapping data generator comprises a controller, a code shift pulse generator,M code generators, N code shift registers, M groups of correlators and a code delay error correction module, wherein the code shift pulse generator is used for generating code shift pulses with different pulse intervals, the code shift pulses are respectively input to the M code shift registers, the M code generators are used for generating M pseudo-random codes of a GNSS signal according to M different initial phases, the M code shift registers are used for respectively caching the M pseudo-random codes according to the code shift pulses and outputting the M pseudo-random codes to the M groups of correlators, the M groups of correlators are used for performing correlated operation on a reflection medium-frequency signal, carrier output from a carrier generator and the received pseudo-random codes sent from the corresponding shift registers, and generating delay Doppler mapping data, and the code delay error correction module is used for respectively inputting the corrected forecast code phase errors into the M code generators.

Description

technical field [0001] The invention relates to the technical field of navigation satellite reflection signal remote sensing, in particular to a non-uniform chip real-time delayed Doppler image data generator. Background technique [0002] Global Navigation Satellite System Reflectometry (GNSS-R) is a technology that uses GNSS signals reflected from the earth's surface to retrieve physical parameters of the earth's surface. GNSS-R is a passive remote sensing technology. The GNSS systems currently in operation include China's Beidou, the United States' GPS, Europe's Galileo and Russia's GLONASS, in addition to some augmented systems such as Japan's QZSS and India's IRNSS. The satellites of these systems provide global rich signal sources for GNSS-R technology, making GNSS-R a remote sensing technology capable of providing global observations. The signal emitted by GNSS is in the L-band, so it is less affected by rainfall and clouds, so GNSS-R technology has all-weather obse...

AI Technical Summary

Problems solved by technology

Such a design can ensure that valid DDM data is received, but most of the data are useless noise signals

At the same time, in order to ensure sufficient redundancy in the chip direction, the resolution of the chip delay cannot be improved, because there are also 122 chip resolution units, and the tolerance of high chip resolution to open-loop tracking errors is worse

But the lower chip resolution will affect the inversion accuracy

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