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Signal tracking demodulation system and method based on dual-channel receiver

A technology of signal tracking and demodulation method, which is applied in the field of satellite communication, can solve the problems of slow tracking and low accuracy of error angle demodulation, and achieve the effects of saving memory, simple implementation, and simplifying the tracking and locking process

Pending Publication Date: 2019-08-02
XIDIAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problems of slow tracking and low error angle demodulation accuracy of the existing Costas phase-locked loop when the satellite signal has a large frequency offset, the present invention proposes a signal tracking demodulation system and method based on a dual-channel receiver, by receiving The dual-channel setting of the machine avoids the 0 / π modulation of the sum signal and the difference signal, realizes the separate processing of the sum signal and the difference signal, and simplifies the entire tracking and locking process; at the same time, it realizes the signal received by the satellite antenna. Fast tracking and accurate demodulation of error angles

Method used

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  • Signal tracking demodulation system and method based on dual-channel receiver

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Embodiment 1

[0053] refer to figure 1 , a signal tracking and demodulation system based on a dual-channel receiver, including: a large frequency offset carrier tracking unit and a demodulation unit.

[0054] After A / D sampling, the sum signal source and the differential signal source enter the dual-channel receiver respectively; the sum signal source enters the large frequency offset carrier tracking unit through the sum channel of the dual channel receiver, so that the large frequency offset carrier Captured and tracked; the differential signal source enters the demodulation unit through the differential channel in the dual-channel receiver, so that the error angle is demodulated to obtain the azimuth error angle and pitch error angle of the antenna; the local numerically controlled oscillator is used to convert the received The signals of the signals are converted into two local oscillator signals with a phase difference, and the two local oscillator signals are respectively output to th...

Embodiment 2

[0064] refer to figure 1 , the implementation steps of a signal tracking demodulation method based on a dual-channel receiver are as follows:

[0065] Step 1. After A / D sampling, the sum signal source and the differential signal source enter the dual-channel receiver respectively, and perform peak detection and gain control on the large frequency deviation signal of the sum signal source in sequence to obtain the sum signal. Perform fast capture and tracking with the channel signal to obtain the tracking frequency control word.

[0066] The specific process is as follows:

[0067] Assume that the sum signal source of the antenna is U ∑ , the differential signal source is U Δ , then its expression is:

[0068]

[0069]

[0070]

[0071]

[0072] Among them, U AZ is the azimuth error angle signal, U EL is pitch error angle signal; M ∑ is the sum signal amplitude, M Δ is the magnitude of the difference signal source, ω 0 is the intermediate frequency angular ...

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Abstract

The invention discloses a signal tracking demodulation system and method based on a dual-channel receiver. The system comprises a large-frequency-offset carrier tracking unit and a demodulation unit.According to the method, the large-frequency-offset carrier tracking unit is used for quickly capturing and tracking a large-frequency-offset signal of a sum path; and accurate demodulation of the differential signals is achieved through the demodulation unit. Through the dual-channel setting of the receiver, the 0 / pai modulation of the sum path signal and the differential path signal is avoided,the separation processing of the sum path signal and the differential path signal is realized, and the whole tracking locking process is simplified; and meanwhile, quick tracking of satellite antennareceiving signals and accurate demodulation of an error angle are realized.

Description

technical field [0001] The invention belongs to the technical field of satellite communication, in particular to a signal fast tracking demodulation method based on a dual-channel receiver system. Background technique [0002] In today's information society, satellite communication, as an important communication method, has important applications in various aspects. In order to achieve the best communication effect in the communication system, the antenna needs to be always aimed at the satellite during the communication process, so the tracking speed and accuracy of the satellite tracking receiver system have an important impact on the communication quality. [0003] In the satellite tracking receiver system, the most common is the single-channel receiver system based on the digital phase-locked loop. The receiver system is mainly based on the Costas phase-locked loop. The phase-locked loop can lock the satellite signal with frequency deviation. The signal received by the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/24
CPCG01S19/24
Inventor 苏涛董浩马鲁潼黄思远赵岗岗
Owner XIDIAN UNIV
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