Weil code generation device and satellite navigation signal receiver

Abstract

The invention discloses a Weil code generation device and a satellite navigation signal receiver. The Weil code generation device comprises a storage device which stores Legendre sequences; an address indicating unit which indicates a first reading address and a second reading address of the Legendre sequence corresponding to each Weil code of the Weil codes to be generated; a plurality of cache groups, wherein each cache group comprises a first cache unit and a second cache unit, the first cache unit of each cache group sequentially reading the Legendre sequence from the storage device according to the first reading address of the Weil code corresponding to each cache group, and the second cache unit of each cache group sequentially reading the Legendre sequence from the storage device according to the second reading address of the Weil code corresponding to each cache group; and an arithmetic unit which carries out exclusive-or operation on data obtained by the first cache unit of each cache group of the plurality of cache groups and data obtained by the second cache unit of the cache group to generate a plurality of Weil codes in real time. Multichannel real-time Weil code generation is realized in a hardware manner.

Description

technical field [0001] The application belongs to the field of satellite navigation signal ranging, and relates to a Weil code generation device and a satellite navigation signal receiver. Background technique [0002] Global Navigation Satellite Systems (GNSS) can complete many tasks such as positioning, navigation, and timing, and has become an important infrastructure to support the national economy and ensure national security. Satellite navigation needs to be realized by using ranging codes, and finding good ranging codes becomes the key to designing navigation signals. [0003] At present, the L1 signal of GPS uses the C / A code as the ranging code, and the C / A code belongs to the Gold code. The length of the Gold code is 2 n -1, but all but 1023 require truncated or grown implementations. However, too much truncation or growth will affect the relative performance of the Gold code. For example, the ranging code length of the L1C signal that GPS is going to put into ...

AI Technical Summary

Problems solved by technology

This method of directly storing 64 kinds of Weil codes in the memory chip takes up more hardware resources

And, since there is usually no need to use 64 kinds of Weil codes in M ​​channels at the same time, a lot of storage space is wasted

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