With the continuous development of technology, the ranging accuracy of pulsed laser range finder (LRF) is higher and higher, so the maintenance demand of LRF is also rising. According to the dominant ideology of "time analog spatial distance" in simulated test for pulsed range finder, the key of distance simulation precision lies in the adjustable time delay. By analyzing and comparing the advantages and disadvantages of fiber and circuit delay, a method was proposed to improve the accuracy of the circuit delay without increasing the count frequency of the circuit. A high precision controllable delay circuit was designed by combining the internal delay circuit and external delay circuit which could compensate the delay error in real time. And then the circuit delay accuracy could be increased. The accuracy of the novel circuit delay methods proposed in this paper was actually measured by a high sampling rate oscilloscope actual measurement. The measurement result shows that the accuracy of the distance simulated by the circuit delay is increased from ± 0.75m up to ± 0.15m. The accuracy of the simulated distance is greatly improved in simulated test for high precision pulsed range finder.
The authors develop an intelligent testing instrument of 1.06μm pulse laser rangefinder anti-jamming performance. The authors present the testing system which is divided into collimating optical system, opto-electronic conversion circuit, mainly-controlling circuit, driving circuit, multi-beams simulated source and computer interface. Based on the testing instrument above, the authors present and research several key techniques: To generate simulated ranging/jamming echoes, the authors present and develop the mainly-controlling circuit which is built with FPGA chip and additional circuits; meanwhile, the authors also develop a new type of multi-beams diode which can be the simulated source of the testing instrument; According to power supply characteristics of multi-beams diode, the authors present and develop a corresponding common cathode driving circuit. The anti-jamming performance testing experimental data shows that the testing result has higher precision.
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