Laser pulse coded signal frequency measuring device based on DSP and CPLD

Zhang, Haibo; Cao, Lihua; Geng, Aihui; Li, Yan; Guo, Ruhai; Wang, Tingfeng

doi:10.1117/12.899165

Cited by 1 publication

(1 citation statement)

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“…Through the formula above,the time interval between the adjacent pulse can be measured from the laser-guided signal.A schematic of the direct frequency measurement method [4] is shown in Figure 8. If the sequential two time interval is the same or very closely and correspond to pre-set coding model which was input by keyboard,the decoing model will capture this pulse signal and the decoging model will transmit some data or command to the laser seeker and guide the missle curved gracefully towards its target .For instance,when the decoding model have identified and trapped the target,the module would create a signal called ETBV which is a rectangle wave span about 200ms to unlock the gyroscope in the strap-down laser guidance part,simultaneously,the model set capture flag COUT as a high level and carry out a synchronous negative pulse.If not,the decoding model will discard the pulse radiation received and the decoging model will not transmit any data or command,so the laser seeker would guide the missle keep on the current attitude.A simulation wave diagram is shown in figure 9.…”

Section: Identification and Trappingmentioning

confidence: 99%

The decoding system of semi-active laser guidance based on FPGA

Chang

Feng

Yimin

et al. 2011

2011 International Conference on Optical Instruments and Technology: Optoelectronic Imaging and Processing Technology

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In this paper,we describe a new design of semi-active laser guided decoding system based on FPGA.The system is designed to receive the echo pulse through a 4-qundrant laser sensor and process the digital laser pulses through analogdigital conversion,which are some fixed interval encoding signal reflected from the target.The decoding system improve the adjustment accuracy of the laser seeker,which reach 0.1us about 50 times in theory compared to current technology. State machine is used to address complicated laser signal,including how to hand of the identification and trapping of the correct laser pulses,how to hand of a state of anti-jamming,how to hand of capturing the laser pulses again after signal missing.And a real-time gate signal is adopted to enhance the ability of anti-interference [1] . Processed signal is used to monitor and control,the processed result is transmitted to a electric actuator and subsequently be sent to laser seeker as a guidance signal or to a PC to simulate and monitor or to be stored in Flash that can extract whenever needed. The whole performance of the system is oprated in laboratory and decoding model is simulated with Modelsim module in detail.The testing results show that the design can reduce the span of decoding time effectively,identify and track the echo pulses from target correctly even to the missed codes or interferential codes.The feasible technique wins the time for laser guidance,and has some theoretical and military value.

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Section: Identification and Trappingmentioning

confidence: 99%