Programmable navigational satellite spread spectrum sequence generator

Abstract

The invention belongs to the technical field of satellite navigation and relates to a programmable navigational satellite spread spectrum sequence generator. The programmable navigational satellite spread spectrum sequence generator comprises input / output modules, a configurable logic unit, a digital clock management module and a block memory which are integrated into a field programmable gate array chip. The programmable navigational satellite spread spectrum sequence generator is characterized in that: different pseudorandom sequence generating methods for different navigation systems by using the spread spectrum sequence generator can be implemented by connecting 1 to 6 code generator units in series or in parallel; and all the code generator units are provided with identical working condition controllers, state shifting controllers, feedback controllers, initial registers and output controllers. The programmable navigational satellite spread spectrum sequence generator is used forgenerating pseudorandom codes in a satellite signal simulator, so the programmable navigational satellite spread spectrum sequence generator has the advantages of greatly reducing expenditure of hardware resources, reserving a larger space for perfecting other functions, and greatly reducing workload of the conventional real-time generating mode, along with easy maintenance.

Description

technical field [0001] The invention belongs to the technical field of satellite navigation, and relates to a programmable navigation satellite spread spectrum sequence generator. Background technique [0002] The superiority of the satellite navigation system in the fields of communication, transportation, military and other fields has caused all countries to invest a lot of manpower and material resources in the research and development of receivers. In order to ensure the measurement accuracy and stability of the receiver, its performance must be tested under various conditions. However, it is also unrealistic to test it in practical various environments (especially in high dynamic situations) at a huge economic cost. Therefore, the research and development of satellite signal simulation technology and simulators are favored. [0003] In the satellite navigation system, using the excellent autocorrelation characteristics of the pseudo-random sequence to realize the time...

AI Technical Summary

Problems solved by technology

The storage method requires considerable hardware resources and cannot be realized

Since the pseudo-random sequence state shift register, state feedback function and output function of each satellite and each band will be different, when using the real-time generation method, it is necessary to write each satellite and band one by one, and the workload is huge. Inconvenient to find the problem

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