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A method for extracting baseband signal

A baseband signal and extraction method technology, applied in the field of signal processing, can solve the problems of slow operation, large amount of operation, high filter order, and achieve the effect of improving operation speed and efficiency, and the method is simple and effective

Active Publication Date: 2021-04-27
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the downlink signal of the detector received by the receiver is a radio frequency signal, if a transmitting and receiving system is designed with software, the required digital sampling rate is high, the amount of data generated is large, and most of them are noise signals, which is useful (effective ) bandwidth is only a few megabytes to tens of megabytes; if a digital filter is designed to extract the baseband signal, the sampling rate of the filter that needs to be designed is very high (at least 4GHz for the S-band, and at least 16GHz for the X-band). Thousands of orders can meet the design requirements, the amount of calculation is large, the calculation is slow, and the efficiency is low
[0003] The current method of extracting the RF signal to the baseband for processing is to construct a cosine function based on the carrier frequency, demodulate the RF signal, and then filter it. This method also has a large amount of data, a high-order filter design, and slow operation. The downside of inefficiency

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  • A method for extracting baseband signal
  • A method for extracting baseband signal
  • A method for extracting baseband signal

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Embodiment 1

[0040] Such as figure 1 Shown, the extraction method of a kind of baseband signal of the present invention comprises the following steps:

[0041] Step 1: Obtain the downlink radio frequency signal s(t) of the detector; the radio frequency signal s(t) includes at least two baseband signals, and the number of baseband signals is N;

[0042] Step 2: processing the radio frequency signal s(t);

[0043] Step 3: Extract the baseband signal s from the RF signal s(t) b (t).

Embodiment 2

[0045] The extraction method of another kind of baseband signal of the present invention comprises the following steps:

[0046] Step 1: Obtain the downlink radio frequency signal s(t) of the detector; the radio frequency signal s(t) includes at least two baseband signals, and the number of baseband signals is N;

[0047] The radio frequency signal s(t) is:

[0048]

[0049] Among them, P T is the total power of the detector RF signal, f c is the carrier frequency, d(t) or sin(2πft) is the subcarrier, θ is its modulation coefficient; m TM is the modulation coefficient of the radio frequency signal, f TM is the frequency of the radio frequency signal; f 1 , f 2 , f N are the frequencies of baseband signal 1, baseband signal 2 and baseband signal N respectively, m 1 , m 2 , m N are the modulation coefficients of baseband signal 1, baseband signal 2, and baseband signal N, respectively.

[0050] Step 2: processing the radio frequency signal s(t);

[0051] Described ...

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Abstract

A method for extracting a baseband signal, comprising the following steps: Step 1: Obtain a downlink radio frequency signal s(t) of a detector; the radio frequency signal s(t) includes at least two baseband signals, and the number of baseband signals is N; Step 2: Process the RF signal s(t); Step 3: Extract the baseband signal s from the RF signal s(t) b (t); Step 4: For the obtained baseband signal s b (t) Perform error analysis; the present invention can directly extract the baseband signal from the radio frequency signal, the method is simple, the error is small, and the work efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of signal processing, in particular to a baseband signal extraction method. Background technique [0002] In the process of deep space exploration and geodetic survey, the downlink signal emitted by the target detector received by the receiver is a modulated radio frequency signal (S-band carrier frequency 2GHz, X-band carrier frequency 8GHz), and the ground receiving station needs to decode the signal Modulation, filtering and other processing, the radio frequency signal is converted to the baseband, and then recorded, transmitted and related processing. Since the downlink signal of the detector received by the receiver is a radio frequency signal, if a transmitting and receiving system is designed with software, the required digital sampling rate is high, the amount of data generated is large, and most of them are noise signals, which is useful (effective ) bandwidth is only a few megabytes to tens of meg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/00
CPCH04B1/0003
Inventor 师永彪刘新宇
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER