Target speed measurement method under the condition of high frequency hopping rate

Abstract

The invention provides a target speed measurement method under a high-speed frequency hopping rate condition, and aims at providing an expanding frequency hopping mixed signal speed measurement method which is low in implementation technique difficulty and capable of reducing target speed calculation real-time requirements. The technical scheme includes the following steps: firstly, an expanding frequency hopping signal passing a down converter is mixed with a local oscillator signal provided by a frequency synthesizer, secondly, an obtained expanding frequency hopping intermediate frequency signal which is de-hopped is transmitted to an analog-to-digital converter (ADC) to be sampled, the expanding frequency hopping intermediate frequency signal is input to a correlator, the relevant process is carried out on the expanding frequency hopping intermediate frequency signal and a pseudo-code signal generated by a pseudo-code synchronization generator, the signal is de-spread, the de-spread signal is transmitted to a frequency difference interval Doppler frequency calculator, frequency difference interval Doppler frequency values are extracted in a real-time mode, the calculated smallest frequency difference interval Doppler frequency value is transmitted to a velometer, the smoothing process is carried out on the calculated smallest frequency difference interval Doppler frequency value through a smooth processor, an average value of the frequency difference interval Doppler frequency values in a period of time is obtained, target speed in the time range is calculated through the average value, and lastly, speed data are output.

Description

technical field [0001] The invention relates to a target speed measurement realization method provided for a measurement and control system of a spread frequency hopping hybrid system in the field of measurement and control communication. Background technique [0002] The spread frequency hopping hybrid system measurement and control system has the characteristics of low signal-to-noise ratio and strong anti-interference ability. Compared with the ordinary spread frequency hopping hybrid system communication system, the measurement and control system also needs to undertake the tasks of speed measurement and distance measurement. The spread frequency hopping mixed signal is a complex signal form. Under the condition that the signal carrier frequency hops in real time according to the frequency hopping pattern, direct sequence spread spectrum processing is also carried out. This signal form includes direct sequence spread spectrum signals and frequency hopping signals. It has...

AI Technical Summary

Problems solved by technology

In order to facilitate the calculation of the target speed, the existing technology usually uses the carrier frequency and carrier Doppler frequency within a frequency hopping interval to complete the calculation of the target speed. However, with the continuous acceleration of the frequency hopping rate of the measurement and control system, the frequency hopping interval It is getting shorter and shorter, calculating the target speed within a frequency hopping interval, the calculation is very real-time, and the realization is difficult, which poses a challenge to the design of the measurement and control system. It is urgent to find out how to realize the measurement and control system under the condition of high-speed frequency hopping rate speed test problem

Images