Multi-channel Weil code generation method and device

Abstract

The invention discloses a multi-channel Weil code generation method and device. Two Legendre sequence modules are introduced, and each Legendre sequence module supports access requests of Legendre sequence controllers of a plurality of channels at the same time; each Legendre sequence module comprises an arbiter unit and a Legendre sequence array unit, and the arbiter unit performs polling scheduling on a reading request and feeds back a read code value to the corresponding Legendre sequence controller; and meanwhile, the bit width of the Legendre sequence is read through the common corresponding design of correlator channels, so that the bandwidth problem of reading the Legendre sequence is solved, the processing step of pre-reading is added through the Legendre sequence controller 50, and the real-time problem of reading the Legendre sequence is solved. According to the scheme, the chip area and the rear-end design complexity can be greatly reduced, and the power consumption is reduced.

Description

technical field [0001] The invention relates to the technical field of satellite navigation, in particular to a multi-channel Weil code generation method and a multi-channel Weil code generation device. Background technique [0002] With the development of satellite navigation technology, Weil codes are introduced as satellite PRN code sequences in new systems such as GPS L1C and Beidou B1C. The Weil code sequence is increased from the usual 1023 code length to 10230, and the code rate is increased by ten times, which makes the code auto-correlation and cross-correlation better, and improves the positioning accuracy. However, the Weil code needs to read two independent chip values ​​from the Legendre sequence, and needs to use cache RAM (Random Access Memory, random access memory) to store the Legendre sequence, so it will occupy a large amount of logic resources. [0003] Due to the increase in the number of satellites in orbit, new changes have been brought to the Weil co...

AI Technical Summary

Problems solved by technology

In the whole tracking subsystem, the period of the Legendre sequence is 10223-10243. In order to support the Weil code generator of 12 correlators, the total capacity of the Legendre cache needs to be increased to 480kbit, and the total number is 48, which will greatly increase the chip’s area and power consumption, increasing the complexity of the back-end design

Using traditional methods to design multi-channel Weil codes will lead to difficulty in chip wiring, and will also increase the area and power consumption, and increase the cost of the chip

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