A system and method for generating satellite navigation signals using chirp signals

Abstract

The invention provides a system and a method for generating a satellite navigation signal based on a Chirp signal. The system comprises a Chirp signal generation module, a pseudo random code generation module, a navigation data generation module, two multipliers, and a clock module. Through the two multipliers, a satellite navigation data signal generated by the navigation data generation module and a pseudo random sequence spread spectrum code signal generated by the pseudo random code generation module are multiplied together to get a digital spread spectrum signal, and the digital spread spectrum signal and a Chirp signal generated by the Chirp signal generation module are multiplied and modulated into a satellite navigation signal. The clock module is used for generating a clock signal driving the Chirp signal generation module, the pseudo random code generation module and the navigation data generation module to work. According to the system and the method provided by the invention, the problem that the whole cycle of carrier phase measurement is fuzzy is solved based on regular change in wavelength and frequency of Chirp signals, and the ranging precision and the signal receiving signal-to-noise ratio are improved based on strong autocorrelation of Chirp signals.

Description

technical field [0001] The invention relates to the technical field of satellite navigation, in particular to a system and method for generating satellite navigation signals by using Chirp signals. Background technique [0002] At present, BPSK (Binary Phase Shift Keying, Binary Phase Shift Keying) modulation is commonly used in the field of satellite navigation, using a carrier signal with a fixed frequency. In the carrier phase measurement, since the wavelength of the carrier is the same, it cannot be distinguished, and there is a problem of integer ambiguity. [0003] In the carrier phase measurement of the satellite navigation system, in order to solve the ambiguity of the whole cycle, it is necessary to carry out multi-frequency measurement and long-term observation. The methods for improving the ranging accuracy in the existing satellite navigation technology include: 1. Increase the code rate of the ranging code, but using this method will take up more signal bandwid...

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Problems solved by technology

[0004] The purpose of the present invention is, in order to solve the above-mentioned existing satellite navigation technology in the signal carrier phase measurement integer ambiguity problem and the problem of improving ranging accuracy, the present invention uses Chirp signal as the carrier wave of satellite navigation signal, utilizes Chirp signal Regular changes in wavelength and frequency distinguish individual carrier wavelengths, thereby resolving the problem of ambiguity around the circumference

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