Satellite navigation signal generating method based on chip-level pulse time hopping

Abstract

The invention relates to a satellite navigation signal generating method based on chip-level pulse time hopping. The method includes: baseband spread spectrum modulation, wherein a signal pseudo-codegenerator generates a signal pseudo-code, and the same and an encoded message are modulated together after chip shaping to obtain a baseband spread spectrum signal; chip time hopping modulation, wherein a frequency hopping pseudo-code generator generates a frequency hopping pseudo-code sequence, a chip gating pulse generator is controlled to generate a chip gating pulse, and chip time hopping modulation with the baseband spread spectrum signal is carried out to obtain a chip time hopping signal; and radio frequency modulation, wherein a carrier generator generates a radio frequency carrier, radio frequency modulation with the chip time hopping signal is carried out to generate a radio frequency signal, generating of a satellite navigation signal based on chip-level pulse time hopping is completed after amplification and filtering, and the same is broadcast and sent to a user through an antenna. The method realizes improvement of anti-interference ability, maintains compatibility with an existing satellite navigation signal system at the same time, and supports high-precision application based on carrier phase measurement.

Description

technical field [0001] The invention belongs to the field of satellite navigation, in particular to a method for generating satellite navigation signals based on chip-level pulse time hopping. Background technique [0002] The current satellite navigation signals are susceptible to interference and occlusion, mainly because the navigation satellite is a power-limited system, and the average transmission power of the signal is limited. The satellite navigation signal mainly adopts the continuous broadcast signal of direct sequence spread spectrum modulation, and the ground level of the satellite navigation signal is low, generally around -160dBW. Moreover, the frequency and modulation method of satellite navigation signals are public, and are particularly susceptible to interference from matching spectrum. [0003] In order to improve the anti-interference ability of the signal, the most effective and direct method is to increase the transmission power of the signal. For thi...

AI Technical Summary

Problems solved by technology

However, direct spread frequency hopping has two shortcomings. First, the frequency hopping system signal is not compatible with existing satellite navigation signals. Second, there are still certain problems in the high-precision measurement of the carrier phase of the FM signal.

The traditional direct spread time-hopping signal is not compatible with the current satellite navigation signal and cannot be directly received by the existing receiving method

When dividing a chip into multiple time slots, the power spectrum of the signal will be changed, and the signal bandwidth will become larger.

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