Method and apparatus for estimating signal noise ratio of frequency-amplifying signal

A technology of spread spectrum signal and signal-to-noise ratio, applied in electrical components, transmission systems, etc., can solve problems such as inability to track weak signals, inability to track GPS signals, slow loop adjustment speed, etc., to reduce implementation complexity and chip power consumption, estimation method is simple and reliable

Active Publication Date: 2007-09-05
凹凸科技平潭有限公司
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Problems solved by technology

Due to the difference in signal strength, if the tracking loop always uses the same bandwidth and integration time when tracking the GPS signal, when the signal is strong, the loop adjustment speed may be too slow to track the changes of the GPS signal. Cause the loop to lose lock; in addition, when the signal is weak, it will cause the loop filtering effect to be poor, and the weak signal cannot be tracked

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  • Method and apparatus for estimating signal noise ratio of frequency-amplifying signal
  • Method and apparatus for estimating signal noise ratio of frequency-amplifying signal
  • Method and apparatus for estimating signal noise ratio of frequency-amplifying signal

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Embodiment Construction

[0018]The receiver receives the GPS signal transmitted by the GPS satellite, and captures, tracks and demodulates it. The purpose of tracking the GPS signal is to adjust the frequency and phase of the local signal generated by the receiver so that it is synchronized with the GPS signal, thereby realizing the demodulation of the GPS signal. The carrier tracking loop and the C / A code tracking loop are used to track the carrier and C / A code in the GPS signal respectively. The parameters of the tracking loop, such as integration time and filter bandwidth, need to be set to different values ​​according to the signal-to-noise ratio of the GPS signal received by the receiver, so as to effectively track the GPS signal. After confirming that the GPS signal is captured, start the tracking loop to track the GPS signal. Before starting the tracking loop, it is necessary to estimate the signal-to-noise ratio of the GPS signal captured in the acquisition phase, and initialize the parameter...

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Abstract

The method comprises: converting the received spread spectrum signals to the digital signals, and dividing the digital signals into the in-phase and quadrature signal components. In the capturing stage, the in-phase and quadrature signal components and the local pseudo random noise code are executed with relevant calculation to get the output of several in-phase and quadrature signal components; making summation for the square of each in-phase and quadrature signal components output to get the signal power and noise power in order to figured out the signal/noise ratio of the spread spectrum signals. In the tracing stage, the in-phase and quadrature signal components and the local pseudo random noise code are executed with relevant calculation; making the summation for the square of output result; based on the in-phase and quadrature signal components, figuring out the average power of noise; based on the signal power and the average power of noise, figuring out the signal/noise ration of spread spectrum signals.

Description

technical field [0001] The present invention relates to a method for processing spread spectrum signals, in particular to a method and device for estimating the signal-to-noise ratio of spread spectrum signals. Background technique [0002] Due to the many advantages of spread spectrum communication technology, it is widely used in various fields such as communication, electronic countermeasures, navigation and positioning. In spread spectrum communication, the information data to be transmitted is modulated by a pseudorandom noise code (PRN) at the transmitting end to achieve spectrum expansion before transmission; the receiving end uses the same code for demodulation and related processing to restore the original information data. [0003] GPS signals are spread spectrum signals transmitted by GPS satellites at L1 or L2 frequencies. Civilian GPS receivers usually use the L1 frequency (1575.42MHZ). Several signals sent on the L1 carrier are: coarse acquisition code (C / A c...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/707
Inventor 俞波李世杰程明强侯剑辉
Owner 凹凸科技平潭有限公司
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