Missile-borne communication system based on spread spectrum communication system

Abstract

The invention provides a missile-borne communication system based on a spread spectrum communication system. The missile-borne communication system comprises a cannonball data transmission radio station end and a ground data transmission receiving end; the cannonball data transmission radio station end is used for carrying out coding, carrier modulation and digital-analog conversion on positioningdata transmitted by a missile-borne computer and sending the data to the ground data transmission receiving end; the ground data transmission receiving end comprises an analog-digital conversion module, a capture branch and a tracking branch; the analog-digital conversion module is used for digitally converting a received analog signal into digital signal data; the capture branch is used for capturing a coarse Doppler frequency offset from the digital signal data and receiving code element initial phases of the signal; and the tracking branch is used for carrying out frequency offset compensation on the digital signal data according to the coarse Doppler frequency offset, and recovering code elements by means of the code element initial phases. The missile-borne communication system has ahigh-dynamic capturing capability, and can capture high-dynamic Doppler frequency shifting acceleration of + / -5 kHz / s under a signal-to-noise ratio of 20 dB.

Description

technical field [0001] The invention belongs to the field of spread spectrum communication, in particular to a missile-borne communication system based on the spread spectrum communication system. Background technique [0002] In the case of high-speed moving objects and rapid changes in motion trajectory, high dynamic Doppler shift will appear. At this time, it is very difficult to capture and track frequency offset, so a high dynamic tracking capable of fast tracking is required loop. Existing tracking loops usually have high-precision tracking capabilities, but the effect is often not ideal for tracking high dynamic frequency offsets. [0003] Document 1 (Yu Yiding, Wang Yongchuan, Wang Changlong. Research on the Application of Chaotic Spread Spectrum Communication in UAV Data Link[J]. Flying Missile, 2016(9):62-64.) proposed spread spectrum communication For applications in UAVs, when capturing and tracking Doppler pulses, the FFT-based cycle correlation capture techno...

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Problems solved by technology

[0004] Document 2 (Feng Juntao, Yang Xinmin, Wang Shenghong. Design method of spread spectrum receiver applied to projectile calibration [J]. Electronic Measurement Technology, 2018(20).) proposed the application of spread spectrum communication in shells, in order to ensure tracking accuracy , which uses the second-order loop to assist the third-order loop method, the tracking accuracy is high, and the frequency offset error is estimated to be less than 10Hz, but at high dynamics, it can only meet the Doppler frequency shift acceleration of ±500Hz / s

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