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A detection method and system for chirp signal power

A technology of signal power and detection method, which is applied in the field of satellite communication, can solve problems such as large resource consumption, inconspicuous capture effect, poor precision, etc., and achieve the effect of improving work efficiency

Active Publication Date: 2018-07-13
西安星通通信科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the traditional method is to judge whether the capture is successful based on the threshold of the FFT result, but the accuracy of the traditional method is very poor, resulting in the capture effect is not obvious, and more importantly, the resource consumption is huge

Method used

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  • A detection method and system for chirp signal power
  • A detection method and system for chirp signal power
  • A detection method and system for chirp signal power

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Experimental program
Comparison scheme
Effect test

Embodiment

[0104] 1. Simulation conditions

[0105] The simulation is carried out in MatlabR2008, the simulated antenna array is a linear array, and the distance between the array elements is 1 / 2 times the wavelength. The signal is an intermediate frequency of 70MHz, and the sampling rate after analog-to-digital conversion is 40 / 3MHz. The chirp signal in this simulation is represented as:

[0106] Wherein, the length of the digital signal in the simulation is 480ms. Among them, the chirp signal only occupies the first 7.5 milliseconds.

[0107] In this simulation, the initial position of the local chirp digital signal is the same as the frame header of the actually received signal. In this simulation, the threshold value T is set as 300; the initial Doppler is set as -4000Hz.

[0108] 2. Simulation content

[0109] According to the specific steps described above in the manual, the signal input through the A / D of the radio frequency channel in the simulation condition is down-conve...

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Abstract

The invention provides a method and system for detecting chirp signal power. Band-pass filtering is performed on chirp digital signals and half extraction is performed after the chirp digital signals are moved to a base band, sixfold interpolation is performed on the half extracted signals, the frequency offset and initial position of a received signal are obtained through a cross FFT-based capture method after down-conversion operation is performed, finally phase shifting and power detection are performed on the chirp signal whose initial position is found, and thus a frame header and frequency offset of the chirp signal can be found rapidly and accurately, work efficiency is improved and resources used by an FPGA are reduced.

Description

technical field [0001] The invention relates to the technical field of satellite communication, in particular to a method and system for detecting chirp signal power. Background technique [0002] The satellite navigation system has the ability of large-scale, all-weather, all-day high-precision positioning, speed measurement and providing timing services, and has been widely used in various fields of national defense and national economy. Competition in the field of satellite navigation is bound to intensify as civilian and military operations become more dependent on satellite navigation systems. [0003] When the antenna is not aligned with the satellite signal, the power of the satellite signal received by the satellite signal will be weakened, which will affect the performance of the receiver. Just like the format of the pilot signal, the useful data signal only occupies a small part of the time. In the process of power detection, because it is difficult to know the fr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B17/318H04B17/309H04L25/02H04B1/69
CPCH04B1/69H04B2001/6912H04L25/0202
Inventor 兴涛
Owner 西安星通通信科技有限公司