A method for generating multiple access long codes in time-division inter-satellite survey communication network

Abstract

The invention discloses a generation method of time-division inter-satellite measurement communication network long multiple-address codes. The method comprises the steps that (1) the number of code elements of long spreading codes in one cycle is calculated; (2) the number of needed long multiple-address codes is determined; (3) the order of a high-order m sequence generator needing to be selected is determined; (4) a spreading code sequence based on a primitive polynomial is generated; (5) code segments with the balance characteristic are searched for; (6) orthogonal spreading code segments are paired and selected; (7) the paired spreading code segments are sequentially distributed to satellite constellation inter-satellite link network access nodes, and the initial states of shifting registers corresponding to the spreading code segments are calculated; (8) the time-division inter-satellite measurement communication network long multiple-address codes are calculated according to a primitive polynomial SSRG structure of the high-order m sequence generator. The method has the advantages that the principle is simple, the process is standard, the balance characteristic and correlated characteristics of code blocks are controllable, the number of taps and the number of registers in project implementation are small, and the resource cost is low.

Description

technical field [0001] The invention mainly relates to the technical field of satellite network, in particular to a method for generating a multi-address long code of a time-division inter-satellite measurement communication network. Background technique [0002] Satellite technology is playing an increasingly prominent role in the national economy. With the development of technology, the requirements for precise orbit determination and time synchronization of navigation satellites and autonomous operation of navigation constellations are becoming more and more urgent, which has given birth to the inter-satellite link technology and made it the basic technical feature and technical commanding height of the global satellite navigation system. Through the inter-satellite link, each satellite of the global satellite constellation (typically a walker constellation) is formed into a network to realize the precise orbit determination and time synchronization of the autonomous oper...

AI Technical Summary

Problems solved by technology

Traditionally, long-period spread spectrum codes use long and short m-sequence stages to truncate and combine XOR operations to form spread spectrum code sequences of the required length. However, this method cannot effectively obtain a code group with excellent balance and correlation characteristics. When multiple sequence generators are selected, there are many method options, and the performance evaluation is difficult. It is difficult to effectively and efficiently complete the spread spectrum code group design.

From the perspective of engineering implementation, the combined code design method cannot obtain the optimized number of shift register taps, which increases the resource cost of FPGA implementation

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