High dynamic weak DS/FH (Direct Sequence/ Frequency Hopping) hybrid spread spectrum signal acquisition system

A hybrid spread spectrum and signal acquisition technology, applied in transmission systems, electrical components, etc., can solve problems such as resource consumption and achieve the effect of rapid acquisition

Active Publication Date: 2014-06-18
10TH RES INST OF CETC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the local waveform is no longer a 1-bit pseudo-random code, generating multiple

Method used

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  • High dynamic weak DS/FH (Direct Sequence/ Frequency Hopping) hybrid spread spectrum signal acquisition system
  • High dynamic weak DS/FH (Direct Sequence/ Frequency Hopping) hybrid spread spectrum signal acquisition system
  • High dynamic weak DS/FH (Direct Sequence/ Frequency Hopping) hybrid spread spectrum signal acquisition system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0048] Embodiment: set radio frequency center frequency f RF is 1GHz, and the frequency hopping rate is R FH =10000hop / s, the frequency hopping bandwidth is 200MHz, the direct spread pseudocode rate is 5MHz, and the pseudocode period is L DSSS =200000, the corresponding frequency hopping period is L FH =400. The maximum relative movement speed of the platform is 12km / s, and the signal sampling rate after processing by the digital front-end unit 3 is 200Msa / s. Consider the weak signal scenario, set the signal-to-noise ratio within the frequency hopping bandwidth to -40dB, at this time the DS / FH spread spectrum signal has been completely submerged in the background noise.

[0049] by f RF The maximum Doppler frequency deviation that can be calculated with the relative motion rate of the platform is ±40kHz. Considering that the coherent integration loss caused by carrier Doppler is acceptable, the carrier Doppler is divided into 10 frequency slots, and the center frequency of...

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Abstract

The invention discloses a high dynamic weak DS/FH (Direct Sequence/ Frequency Hopping) hybrid spread spectrum signal acquisition system, and aims to provide an acquisition system which consumes less resources, has a simple structure, and is capable of reducing hardware resources. The acquisition system is realized through the implementation scheme that in an acquisition subsystem, a digital front-end unit inputs a zero intermediate frequency signal from a radio frequency subsystem into a Doppler slotting unit to be subject to Doppler precompensation; a time unit (8) drives a spreading and hopping pseudo-code generator (9) to input a spreading and hopping pseudo code into a composite code generating unit (10) to produce a composite code; a control unit (11) stores the signal, subjected to Doppler precompensation, from the Doppler slotting unit, and the composite code to a storage unit (5); the control unit (11) drives a parallel related unit (6) to fetch related data from the storage unit to perform parallel correlation calculation; a judgment unit (7) carries out the maximum comparison on the result of parallel correlation calculation, and feeds back the obtained correct code phase to the time unit (8) to drive the spreading and hopping pseudo-code generator (9) to produce the correct-phase DS pseudo code and FH pseudo code.

Description

technical field [0001] The invention relates to the technical field of wireless communication, and is suitable for a hybrid spread spectrum signal acquisition system structure in the environment of high dynamic (12km / s relative speed) and weak signal (-40dB in-band signal-to-noise ratio) environment of DS / FH hybrid spread spectrum system. technical background [0002] Compared with Direct Sequence Spread Spectrum (DSSS) and Frequency Hopping Spread Spectrum (FHSS), DS / FH Hybrid Spread Spectrum has stronger anti-interference and low intercept performance. The existing DS / FH hybrid spread spectrum signal acquisition methods can be summarized as the following: [0003] (1) The serial capture method includes: [0004] Waiting for synchronization method: the receiver fixes the local frequency, and uses the sliding correlation method to search for the phase of the direct spread code until the correct code phase is found; [0005] Fast scanning method: The receiver hops frequency...

Claims

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Application Information

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IPC IPC(8): H04B1/707H04B1/713
Inventor 刘田袁田陈晓萍黄凌
Owner 10TH RES INST OF CETC
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