Demodulation Method of Angle Error Signal of Spread Frequency Hopping System in Dual Channel Tracking Receiver

Abstract

The invention discloses a method capable of guaranteeing the demodulation performance of an angle error signal of a double-channel tracking receiver in a spread frequency hopping system. Use the sum channel receiver to perform frequency hopping synchronization, pseudo code synchronization and carrier synchronization on the sum signal; the difference channel receiver divides the bandwidth of the entire spread frequency hopping signal into N frequency sub-intervals according to the frequency hopping pattern, and uses the sum channel receiver to obtain The frequency hopping pattern T(t) de-hops the difference signal, uses the obtained direct spread pseudo code PN(t) to despread the difference signal, and uses the obtained carrier phase Φ(t) to perform azimuth and elevation shift After the phase control, the correlation detection with the difference signal is carried out, and the angle error signal is smoothed according to the same integration time for each frequency sub-interval to obtain the respective angle error signals of the N frequency sub-intervals, and the N groups obtained by the N frequency sub-intervals The angle error signal is normalized and weighted according to the weight of the total energy of the signal within the integration time T that the strobed signal energy of each frequency sub-interval signal accounts for, and the final angle error voltage is obtained.

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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