Correlated peak detection method of double channel pn code acquisition system

Abstract

A correlated peak detection method of a double channel pn code acquisition system is disclosed. The method comprises four steps that: 1. Input spreading code data is divided into several data segments and the each data segment carries out correlation calculation with two-channel local pn code segments with same length; correlation information obtained through two main / auxiliary channel calculation is input into a shift register group; 2. The shift register group is formed by an upper shift register and a lower shift register, and when correlation calculation of one input data segment is completed and a new correlated peak is obtained, the shift register carries out operations of shifting and deblurring; 3. The correlation information is output; 4. After the above steps, an effective correlation peak sidelobe is filtered, the correlation information of the effective correlation peak is extracted so as to be used for local pn code reset position calculation; simultaneously, times of verifying the effective correlation peak is calculated, which provides a basis for an acquisition system to determine whether the correlation information is real.

Description

technical field [0001] The invention relates to a direct-sequence spread spectrum pseudo-code acquisition technology suitable for satellite integrated baseband equipment, in particular to a correlation peak detection method of a dual-path pseudo-code acquisition system based on local pseudo-code superposition. The invention belongs to the technical field of satellite comprehensive baseband testing. Background technique [0002] Satellite integrated baseband equipment refers to the terminal equipment that organically integrates multiple functions such as distance measurement, speed measurement, remote control, telemetry, and data transmission in the satellite measurement and control communication system. Command, TT&C) mission, satellite pre-launch test and satellite in-orbit test. The integrated baseband equipment adopts a unified direct sequence spread spectrum measurement and control system for data transmission. The direct sequence spread spectrum (Direct Sequence Sprea...

AI Technical Summary

Problems solved by technology

Dual-channel pseudo-code capture overcomes the possible correlation peak loss caused by data jump edges when there is data modulation, and is equivalent to performing two correlation peak verifications on the same piece of input data; Correlation peak loss may be brought about by partial correlation calculation, but at the same time, correlation peaks with the same position (called effective correlation peak side lobes) are added to the data segments on both sides of the effective correlation peak data segment, which gives real correlation information detection and The reset point calculation of the native pseudocode poses difficulties

Images