Pseudo-random Keying Rf Circuit Simulation Design

The process of radio communication is CNSS transmitters radiate the radio signal containing information to the space,The receiver detect the useful signal from the complex space environment.This way of transmitting and receiving communication signals is open, allowing the radio signals can easily be measured,intercept and interference by enemy.An effective anti-jamming measure is using frequency-hopping spread spectrum method, This way uses the pseudo-random sequence that nothing to do with the information to make the RF signal bandwidth much larger than baseband signal bandwidth,The signal that spread spectrum by frequency-hopping mode hopping in a wide frequency range can avoid communication interference.This paper describes how the FH system works and its advantages,then analyzes the theroy of PN frequency-hopping fix distance and speed. Based on this, analyzes theroy of PN frequency-hopping RF circuitry,and shows a block diagram of RF front-end design principle. According to the block diagram, discusses the various parts of the circuit and design them,then uses ADS software for each of the circuit design and simulates to meet the design specifications. After the simulation,we design the RF front-end circuit layout by using Protel software. When circuit board is completed,debug the circuit and analyze the results to find out the reasons for deviations and make improvements.