Direct sequence/frequency hopping signal system array antenna adaptive beamforming system

Abstract

The invention discloses a direct sequence/frequency hopping signal system array antenna adaptive beamforming system. The adaptive beamforming system has strong anti-jamming capability. According to the technical schemes of the invention, DS-FH (direct sequence/frequency hopping) mixed spread spectrum signals outputted by a frequency hopping transmitter pass through each array element channel of anarray antenna; mixers mix received radio frequency signals; A/D converters convert mixed signals into digital signals; the digital signals are subjected to frequency hopping carrier capturing, and then, a frequency synthesizer outputs reference local oscillation signals in a mixed manner; the de-hopping of the radio frequency DS-FH signals is realized; de-hopped direct sequence spread spectrum signals are subjected to primary down-conversion through digital down converters; a plurality of paths of intermediate-frequency direct sequence spread spectrum signals which are obtained after digitaldown-conversion is performed are sent to an adaptive beamforming module; the adaptive beamforming module generates a path of spread spectrum signals through weighting; the adaptive beamforming moduleperforms de-spreading processing on the spread spectrum signals; a weight vector is solved through adopting a recursive least squares (RLS) algorithm; minimum output power is obtained according to theobtained weight vector; and nulls at interference sites are formed.

Description

technical field [0001] The invention relates to an array antenna self-adaptive beam forming system of a spread / frequency hopping signal system applied in a shooting range measurement and control system. Background technique [0002] Direct Sequence Spread Spectrum-DSSS (Direct Spread-DS for short) and Frequency Hopping Spread Spectrum-FHSS (FHSS for short) are the most widely used in these two fields. spread spectrum method. Due to the low spectral density of the pseudo-code direct sequence spread spectrum system, it has good anti-interference and anti-intercept performance, and its application in engineering is becoming more and more common. In foreign countries, the ultra-wideband spread spectrum technology is more popular, and its characteristics are as follows: Good concealment, strong penetrating ability, high spreading gain, anti-multipath, high transmission rate, large system capacity, easy networking, high positioning accuracy, etc. It is easy to integrate positioni...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the serious shortage of anti-jamming, anti-interception and anti-detection capabilities of traditional shooting range measurement and control systems, the present invention provides a device with strong anti-interference ability, which can enhance the anti-inte

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