Development Of Pseudo-random Signal Anti-jamming Theory And Application In IP Instrument

Pseudo-random signal anti-jamming theory based on correlation identification method, through the unit impulse response and excitation polarization method to achieve in the electrical exploration in the anti-jamming applications.The anti-jamming principle of pseudo-random signal is discussed from the two aspects of time domain and frequency domain, and the parameters selection criteria which affect the recognition accuracy and anti-jamming performance are analyzed. Using MATLAB and Multisim simulation software, the system identification and anti-jamming simulation are carried out by combining RC circuit and geoelectric system. Developed a set of pseudo-random instrument prototype system, and design a number of experiments on the instrument and methods to verify.The Wiener-Hof equations are deduced based on convolution, correlation and optimization criteria, and the time domain, correlation and frequency domain characteristics of the pseudo-random m signal are introduced. A method of solving the unit impulse response from the data of the correlation operation is discussed. The system identification process resolved into four steps, each corresponding to the frequency domain analysis. The anti-jamming principle of correlation identification is explained by the time domain and frequency domain characteristics of pseudo-random m signal.In the part of the system simulation, the RC circuit and the geoelectric system with analytic formula are selected as the simulation system, and the system simulation is carried out from the point of view of interference and no-interference. The paper also introduces two indexes to evaluate the anti - jamming performance, power SNR gain and noise variance gain, and quantitatively evaluate the anti-jamming performance of pseudo-random signals.This paper developed a set of pseudo-random Induced Polarization instrument prototype, including the transmitter and receiver. The transmitter can transmit regular waveforms in the time domain and frequency domain, and can also transmit pseudo-random m signal waveforms. The receiver can also be used for conventional IP methods or pseudo-random anti-jamming. The system uses the SD card as the storage medium to collect the waveform data of the whole time domain. The GPS and the line synchronization mode are used to realize the cooperative work of the transmitter and the receiver. The wireless Bluetooth and RS232 are used to realize human-computer interaction. The paper also designed three types of experiments,namely RC circuit experiment, sink experiment and field experiment. The practicality of the instrument system is verified by several experiments. The data processing and analysis are carried out by MATLAB,which verifies the scientific nature of the pseudo-random signal anti-jamming theory.