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Precompensation method for in-band group delay fluctuation of satellite navigation signal generating system

A satellite navigation signal and generation system technology, which is applied in the field of pre-compensation of in-band group delay fluctuations in the satellite navigation signal generation system, can solve the problems of complex feedback loop and calibration system, large compensation error, and increased complexity, and achieve Flexible and convenient parameter modification, avoiding signal distortion, increasing weight and power consumption

Active Publication Date: 2013-09-04
XIAN INSTITUE OF SPACE RADIO TECH
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Problems solved by technology

[0008] (1) Method 1 assumes that the group delay of each narrowband signal output by the comb wave filter is a fixed value, and then compensates it. If the bandwidth of the comb filter is wide, this method will cause a large compensation error; If the bandwidth of the comb filter is narrow, it will lead to increased complexity and cost;
[0009] (2) The feedback loop and calibration system of this method 2 are complex to implement and are not suitable for satellite navigation signal generation payloads

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Embodiment Construction

[0030] refer to figure 1 , the satellite navigation signal generating system filter group delay precompensation method in the present invention, comprises the following steps:

[0031] (1) Use a vector network analyzer to measure the combined S-parameters of the modulator, filter and amplifier (that is, the input-output relationship of the modulator, filter and amplifier as a combined whole). The S-parameters are a set of complex vectors, which can be expressed as s(ω)=s real (ω)+is imag (ω), s real (ω) and s imag (ω) are the real part and imaginary part of the S parameter respectively, using

[0032]

[0033] Calculate the combined amplitude-frequency characteristics A(ω) and phase-frequency characteristics of the above three devices Where |·| represents the absolute value operation, arctan(·) represents the arc tangent operation,

[0034] use

[0035]

[0036] Calculate the combined group delay characteristics of the modulator, filter, and amplifier, where is...

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Abstract

The invention relates to a precompensation method for in-band group delay fluctuation of a satellite navigation signal generating system, which comprises the following steps: (1) measuring a combined S parameter of a modulator, a filter and an amplifier in the satellite navigation signal generating system, and determining amplitude-frequency and group delay characteristic of the combination of the three devices; (2) counting the group delay characteristic of a precompensation filter according to the combined group delay characteristic; (3) obtaining the phase-frequency characteristic of the precompensation filter; (4) setting the phase-frequency characteristic of the precompensation filter to be an inverse Sinc function; (5) obtaining a system function of the precompensation filter according to the amplitude-frequency characteristic and phase-frequency characteristic of the precompensation filter; (6) obtaining a unit impulse response function of the precompensation filter; (7) setting a threshold value, and setting the quantity in the unit impulse response function, which is smaller than the threshold value, to be zero to be as a coefficient of the precompensation filter; and (8) realizing the precompensaiton filter in a digital standalone of the satellite navigation signal generating system by using the coefficient of the precompensation filter, so as to compensate the group delay fluctuation of the satellite navigation signal generating system.

Description

technical field [0001] The invention relates to satellite navigation technology, in particular to a precompensation method for in-band group delay fluctuation of a satellite navigation signal generation system. Background technique [0002] The satellite navigation signal generation system is composed of digital stand-alone, modulator, amplifier, filter and antenna. The digital stand-alone generates a digital baseband signal according to the agreed navigation signal format, and sends it to the modulator after digital-to-analog conversion; the modulator up-converts the analog baseband signal to generate a radio frequency navigation signal, and sends it to the amplifier; the amplifier amplifies the radio frequency navigation signal To the required power, broadcast to the ground through the antenna. [0003] During the generation of satellite navigation signals, the group delay fluctuations of modulators, filters and amplifiers seriously deteriorate the quality of the generate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03H04B17/00H04B17/309
Inventor 苏哲徐启炳王磊陶晓霞蒙艳松
Owner XIAN INSTITUE OF SPACE RADIO TECH
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