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Method for capturing carrier in microwave unification measurement and control system base on convolution operation

A convolution operation, measurement and control system technology, applied in transmission systems, digital transmission systems, transmission monitoring, etc., can solve problems such as blind capture and restrictions that are not suitable for carriers

Inactive Publication Date: 2009-01-21
TSINGHUA UNIV
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Problems solved by technology

The spectrum template matching method and the frequency preset method need prior information of the measurement and control signal, which is not suitable for the blind capture of the carrier, and the application is subject to certain restrictions.

Method used

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  • Method for capturing carrier in microwave unification measurement and control system base on convolution operation
  • Method for capturing carrier in microwave unification measurement and control system base on convolution operation
  • Method for capturing carrier in microwave unification measurement and control system base on convolution operation

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Embodiment Construction

[0026] The carrier of the microwave unified measurement and control system signal adopts the phase modulation (PM) system, and this signal can be expressed as S(t) when receiving:

[0027]

[0028] In formula (1), A is the carrier amplitude, w c Is the carrier angular frequency of the transmitter, w d (t) is the frequency of the changing Doppler angle, m i Is the phase modulation index of the i-th subcarrier to the carrier, that is, the modulation degree, f i (t) is the i-th subcarrier modulation signal, which can be a baseband ranging code, a sine wave, or a modulation signal such as PSK and FSK, Is the initial phase of PM modulation.

[0029] For ease of analysis, suppose the subcarrier signal is k sine wave signals, w d (t)=0, The signal after carrier modulation is expressed as:

[0030] S ( t ) = A cos [ w c ...

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Abstract

The present invention relates to a carrier capturing method of uniform microwave measurement and control system based on the convolution operation, and belongs to the technical field of digital communication. The method is characterized by the A / D sampling and digital complex down-conversion of the received uniform microwave measurement and control signals, and the convolution operation of the output complex baseband signals x(n) comprising the Doppler shift. The main carrier is captured by mapping one maximum value of the convolution operation. The method can be used for carrier capture in the system of phase modulation (PM) in the deep space communication, and in particular has significant advantages on the occasion of high-degree modulation. The FFT unit of the pipeline structure can be adopted to overcome the speed limit of hardware realization to certain extent.

Description

Technical field [0001] The invention relates to a carrier acquisition method of a microwave unified measurement and control system based on convolution operation, and belongs to the technical field of digital communication. Background technique [0002] With the continuous development of deep space exploration, the link margin of the microwave unified measurement and control system is becoming more and more tight. In order to increase the link margin, measures such as increasing the antenna aperture, increasing the RF operating frequency band, reducing the noise temperature of the receiving system, adopting high-performance error correction coding and increasing the modulation degree of the signal. The latter two belong to "soft" technical solutions, and considerable link gains can be obtained at a relatively small cost. If the modulation degree is increased from 0.2 to 1.8, the subcarrier can obtain a gain of 5dB. However, with the increase of the modulation degree, the carrier ...

Claims

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Application Information

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IPC IPC(8): H04B17/00H04L1/22H04B1/7075H04B1/7085
Inventor 詹亚锋曾维亮陆建华
Owner TSINGHUA UNIV
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