New algorithm of angle tracking for non-cooperative direct sequence spread spectrum signals

In order to track the angle of non-cooperative direct sequence spread spectrum (DSSS) signals, a new algorithm of azimuth angle error and elevation angle error extraction for single channel amplitude comparison monopulse tracking radar is presented. In this algorithm, the signal has been delayed and multiplicated. After detection of signal and acquisition of the PN code rate, angular errors in azimuth and elevation can be derived in the frequency of code rate. Compared with estimation methods available for the tracking of DSSS signal, the proposed algorithm can track cooperative or non-cooperative objects under the condition of low signal-noise ratio (-20dB). A block diagram of implementation is given for the processing method. The validity of design is verified by simulation results.