GPS Receiver Signal Acquisition Using Discrete Cosine Transform
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional GPS receivers are slow in acquiring satellite signals due to the time-consuming Fourier transform process, which delays subsequent signal tracking and positioning processes.
Innovation Solution
Implementing a discrete cosine transform (DCT) demodulation procedure to parse the receiving time base of satellite signals, transforming them into code information and navigation frequency, and performing correlation correction to acquire navigation information, thereby accelerating the signal acquisition process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If Fourier transform is used for signal acquisition, then signal processing can be performed, but the processing speed is slow and time-consuming
Solution Approach 1:
The patent changes the mathematical transform parameter from Fourier transform to Discrete Cosine Transform (DCT). This parameter change in the signal processing method reduces computational complexity and increases processing speed, directly resolving the contradiction between achieving signal processing and maintaining fast acquisition speed.
2Productivity
If conventional Fourier transform method is used, then complete signal analysis is achieved, but computational complexity is high
Solution Approach 1:
The patent applies DCT instead of Fourier transform, changing the mathematical parameter of the processing method. DCT has lower computational complexity while maintaining effective signal processing capability, thus improving productivity without excessive device complexity.
Solution Approach 2:
The patent extracts and utilizes only the cosine component (real part) of the transform, discarding the sine component (imaginary part) that is not needed for GPS signal acquisition. This extraction principle reduces computational load while preserving essential signal information.
Data Source
AI summary
A signal acquiring method of a GPS receiver and a digital camera thereof, suitable for accelerating a signal acquiring speed of the GPS receiver, are described. The signal acquiring method includes the following steps receiving a plurality of satellite signals; performing a discrete cosine transform (DCT) demodulation procedure, so as to parse a receiving time base of the satellite signals; next, transforming the satellite signals into a code information and a navigation frequency according to the receiving time base of the satellite signals; then, performing a correlation correction procedure to acquire a navigation information from the satellite signals according to the code information and the navigation frequency; which thus accelerates the processing speed on the signal acquiring flow through calculation characteristics of the DCT.