Demodulation method of dual-channel tracking receiver frequency spreading and hopping system angle error signal

Abstract

The present invention discloses a method capable of ensuring dual-channel tracking receiver frequency spreading and hopping system angle error signal demodulation performance. A sum channel receiver is used to carry out frequency hopping synchronization, pseudo-code synchronization and carrier synchronization on a sum signal. A difference channel receiver divides the bandwidth of a whole frequency spreading and hopping signal into N frequency sub areas according to a frequency hopping pattern. A difference signal is subjected to de-hopping processing by using the frequency hopping pattern T(t) obtained by the sum channel receiver, and the de-spreading processing is carried on the difference signal by using an obtained direct spread pseudo-code PN(t). The orientation and pitch phase shift controlling are carried out by using an obtained carrier phase PHi(t) and then related detection is carried out with the difference signal. Each of the frequency sub area is subjected to the smoothing processing of the angle error signal according to a same integration time. The respective angle error signal of N frequency sub intervals is obtained. The N groups of angle error signals obtained by the N frequency sub intervals are subjected to normalizing weighting processing to obtain final angle error voltage according to the weight of the gated signal energy of each frequency sub interval signal in a signal total energy in an integration time T.

Description

technical field [0001] The invention relates to a method for demodulating an angle error signal of a dual-channel tracking receiver in the field of aerospace and aviation under the spread frequency hopping modulation system. Background technique [0002] In order to improve the anti-interference and anti-interception capabilities of measurement and control equipment, on the basis of the direct sequence spread spectrum system, a signal modulation system combined with spread frequency hopping has recently been proposed. Under this system, the received signals are distributed within a bandwidth of about 100MHz. Dual-channel monopulse tracking is widely used in aerospace measurement and control equipment, and the dual-channel tracking receiver needs to correct the phase difference of the sum and difference signals. The bandwidth of the extended frequency hopping receiving signal is very wide, and it is distributed within the bandwidth range of about 100MHz. Because the signal ba...

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Problems solved by technology

The bandwidth of the extended frequency hopping receiving signal is very wide, and it is distributed within the bandwidth range of about 100MHz. Because the signal bandwidth is very wide, the phase difference of the sum and difference signal at different frequency points is relatively large, and the sum of different frequency hopping points in the entire extended frequency hopping signal interval The huge change of the phase difference of the difference signal has a great impact on the demodulation of the angle error signal, which brings new design difficulties to the realization of the dual-channel monopulse tracking receiver

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