Multi-access interference false locking resistance judgment method based on spread spectrum mechanism

Abstract

Provided is a multi-access interference false locking resistance judgment method based on a spread spectrum mechanism. Cross-correlation properties of pseudo codes are analyzed and simulated, amplitude properties of multi-access interference are combined, and a multi-access false locking judgment and retreat method with a stable and reliable judgment result is designed. Compared with measures that a power control technique is adopted and a pseudo code capture strategy is improved adopted an existing satellite technology, the method solves the multi-access false locking problems that a locking judgment under a weak signal-to-noise ratio is inaccurate and false locking is prone to happening to a strong signal-to-noise ratio loop, greatly improves spread spectrum pseudo code capturing and tracking reliability and has broad application prospects in the aspect of spread spectrum false locking resistance achievement of medium and low earth orbit satellites.

Description

technical field [0001] The invention relates to a multi-access interference error-resistant lock judgment method based on a spread spectrum system, which is compatible with single-channel signals and multi-channel multiple-access spread spectrum signals, and can realize automatic identification of pseudo-code phase false locks and system exit and recapture, mainly in It is used on various medium and low orbit satellite spread spectrum measurement and control platforms, and belongs to the field of satellite measurement and control technology. Background technique [0002] In a single channel with a medium-strong level, before the phase alignment of the pseudo-code, the cross-correlation peak may be greater than the capture threshold and a false lock may occur. Under the condition of multiple access interference, the peak value of mutual correlation between multiple access interference and the local code may be greater than the peak value of the autocorrelation of the signal, ...

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Problems solved by technology

However, the interference-to-signal ratio mainly examines the anti-jamming, anti-receipt and anti-interception capabilities of a single machine. It is a system technical index requirement, and the interference-to-signal ratio cannot be lowered arbitrarily.

[0007] 3) The improved pseudo-code capture strategy refers to the reasonable selection of the capture threshold, but no further development and detailed theoretical analysis, lack of basic theoretical support and formula analysis and derivation

The traditional false code anti-error lock technology has been unable to meet the reliability requirements of spread spectrum measurement and control equipment multi-site anti-false lock automatic identification and exit recapture

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