Frequency hopping spreading code phase tracking method suitable for narrowband interference

Abstract

The invention discloses a frequency hopping spreading code phase tracking method suitable for narrowband interference. The method comprises the following steps: generating a local frequency hopping code word and a local spreading code word; de-hopping received frequency hopping spreading signals; performing low-pass filtering and draw-off on the de-hopped signals to obtain data with a reduced rate; carrying out digital automatic gain control on the data with the reduced rate to obtain data with basically constant amplitude; performing rotation amount control, i.e., controlling the rotation amount of phase rotation; performing the phase rotation on the data with the basically constant amplitude; performing de-spreading on the data after the phase rotation; accumulating the data after the de-spreading, and finding an accumulative mode maximum value and a corresponding phase rotation amount; and performing phase adjustment amount accumulation, i.e., accumulating all phase adjustment amounts, and performing division on an accumulation result and a clock period of a local reference clock to obtain a quotient and a remainder value, for performing overall reference clock period adjustment on a local frequency hopping spreading code phase and performing adjustment within one reference clock period on the local frequency hopping spreading code phase according to the remainder value.

Description

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine

Login to View More

AI Technical Summary

Benefits of technology

This patented technology describes improved techniques for controlling the movement or position (the orientation) of a device called a sensor when it moves around within certain environments such as inside spaces where there may have many different types of electromagnetic waves transmitting signals simultaneously. By comparing changes caused by these waveforms over time, this technique helps identify specific areas of interest while avoiding false alarms. It also uses advanced algorithms like Kalman filters to determine if any deviated parts should stay at their original location during steady operation. Additionally, the use of multiple sensors allows for precise measurements even beyond just those expected due to weak crossings between adjacent frequencies. Overall, this new approach enhances the ability of electronic devices to accurately measure environmental factors affecting them' movements.

Problems solved by technology

This patented technical problem addressed by this patents relates to improving error detection capabilities for CDMA systems that use frequency modulation techniques such as Direct Sequence Spread Spectrum or Frequency Hopped Interval Measurement Distance Compensation (DFIC).

Images