Method and system of capturing three-frequency multichannel radio measurement system signal

Abstract

The present invention relates to a method and system of capturing a three-frequency multichannel radio measurement system signal. The method comprises the steps of S1: adopting three high speed analog-to-digital converters to carry out the low pass sampling on three frequency band analog intermediate frequency signals simultaneously to obtain the digital intermediate frequency signals; S2: carrying out the down-conversion processing on the three frequency band digital intermediate frequency signals simultaneously according to the respective set carrier frequencies to obtain three frequency band to-be- despread data flows; S3: capturing three frequency band multichannel signals in a time division multiplexing capture manner; S4: carrying out the code phase search; S5: waiting for the next memorizer switching moment; S6: converging a Doppler frequency search range step by step by utilizing the speed of searching one frequency unit within one data sampling cycle to obtain the carrier parameters of the signals; S7: searching the code phase time delay of a time evaluation peak point signal; S8: obtaining an accurate instant code phase, and outputting a capture result. The system is used to realize the above method. The method and the system of the present invention have the advantages of being easy to realize, being high in precision, being able to satisfy the current engineering conditions, etc.

Description

technical field [0001] The invention mainly relates to the field of radio measurement signals, in particular to a method and system suitable for capturing multi-beam and multi-channel radio measurement signals. Background technique [0002] Doppler Orbitography by Radio Positioning Intergrated on Satellite (DORIS) is a high-precision satellite Doppler Orbitography by Radio Positioning Intergrated on Satellite (DORIS) is a French National Space Research Center CNES (Centre National d'études Spatiales) and the French National Geographic Institute IGN (InstiutGeographiqueNational) and the French National Geodetic Research Organization GRGS (Groupede Recherchesen Geodesie Spatiale) developed in cooperation, can provide full-arc high-precision orbit products. The DORIS system consists of an onboard part and a ground part. The part on the star includes dual-frequency omnidirectional antenna, receiver and ultra-stable quartz oscillator USO (ultra-stableoscillator). The ground par...

AI Technical Summary

Problems solved by technology

At present, for the rapid acquisition of satellite spread spectrum signals, the traditional time-domain parallel correlation acquisition method has low computational complexity and is easy to configure parameters to realize channel switching, but the acquisition time is limited by the acquisition processing time, so the only way to increase the number of correlation channels for parallel search code phase To reduce the capture processing time, which is difficult to achieve in the case of limited spaceborne equipment resources

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