Spread spectrum code synchronous transmitting method and device

Abstract

The invention discloses a spread spectrum code synchronous transmitting method and a spread spectrum code synchronous transmitting device and belongs to the technical field of wireless signals. The method comprises the following steps that external spread spectrum signals are obtained; a group of local codes are locally generated and are respectively multiplied and integrated with external spread spectrum signals, the quadratic sum is obtained according to integral results, the integral power value is obtained, and the local code with the maximal integral power value is used as a matching local code; E, P and L matching local codes are generated and are respectively multiplied and integrated with external spread spectrum signals, the quadratic sum is obtained according to integral results, three paths of integral power values are obtained, and the phase difference is obtained according to the three paths of integral power values; the matching local code when the phase difference is zero is used as a capturing local code; and synchronous transmitting codes are generated according to the capturing local code and are sent. The method and the device have the advantages that the synchronous transmitting of the transmitting codes and the external spread spectrum signals can be realized, the limitation of spread spectrum code synchronization on the network structure and scale is reduced, and the demands of networks on high synchronization precision, simple structure and low cost are met.

Description

technical field [0001] The invention relates to the technical field of wireless signals, in particular to a method and device for synchronous transmission of spreading codes. Background technique [0002] Spread spectrum communication is a preface technology that has been rapidly developed in the current information field. Because of its strong interference, good confidentiality, low power consumption and many other advantages, it has become a very important communication method. Synchronization is the key technology of spread spectrum communication. How to maintain a good synchronization device to work effectively and reliably has always been the focus of research by researchers. In some application fields, such as location services, vehicle navigation, etc., the local receiving end not only needs to be able to receive external spread spectrum signals synchronously, but also needs to transmit local spread spectrum codes synchronously to realize multi-code joint decoding of ...

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Problems solved by technology

[0006] However, the spread spectrum code synchronous transmission technology based on GPS satellite timing can only be used in open outdoor areas. For large indoor buildings and urban canyon areas, due to the occlusion of GPS satellite signals, its application is limited

At the same time, the use of GPS equipment for timing synchronization complicates the networking of each sending node and increases the cost, resulting in a decrease in device stability

[0007] To sum up, in the process of realizing the present invention, the inventor found that the schemes of spreading code synchronization in the prior art have relatively serious limitations in use, complex networking structure, high cost, and are not suitable for large-scale networks. application

In the prior art, there is no reliable scheme for synchronous transmission of spreading codes to meet the requirements of high precision and simple network structure

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