Method for utilizing general instrument for testing pulse doppler fuze starting characteristic

Abstract

The invention relates to a method for utilizing a general instrument for testing a pulse doppler fuze starting characteristic. According to the method, a pulse emission signal of a fuze under test isdirectly utilized as a synchronizing signal for triggering a vector signal generator so as to produce a radio-frequency signal, no other instrument is needed, and the working frequency can reach to amillimeter wave, so that the cost is lower; and the method is simple and convenient to operate, adjust in parameter adjustment, good in universality and wider in application range. Particularly, the vector signal generator can be combined with the synchronizing signal of a pulse doppler fuze so as to carry out delay adjustment for adapting to synchronizing datum drift of the pulse doppler fuze. According to the method provided by the invention, data can be conveniently adjusted according to the selected parameters such as a trajectory and speed, the vector signal generator emits vector echo data consistent to the current trajectory parameter, and a pulse doppler fuze starting parameter is acquired and recorded. The method can realize zero delay and can particularly adapt to a pulse synchronizing signal clock of the pulse doppler fuze, and the error influence caused by clock asynochronization of the vector signal generator and the fuze under test is avoided.

Description

technical field [0001] The invention belongs to a method for testing the start-up performance of a radio fuze, in particular to a method for testing the start-up characteristics of a pulse Doppler fuze by using a general instrument, and is a static simulation test method for the start-up performance of a microwave / millimeter wave pulse Doppler fuze. Background technique [0002] The radio fuze utilizes the information carried by the echoes during the rendezvous process to independently decide the timing of detonation, thereby activating the warhead to achieve effective damage to the target. The pulse Doppler fuze acting on the ground measures the distance during the missile body rendezvous, and gives an activation signal at a specific distance. [0003] The main methods of radio fuze starting performance test are target test and laboratory simulation. The effect of range test is real, but it is time-consuming and labor-intensive. Moreover, since radio fuze is a one-time acti...

AI Technical Summary

Problems solved by technology

[0003] The main methods of radio fuze starting performance test are target test and laboratory simulation. The effect of range test is real, but it is time-consuming and labor-intensive. Moreover, since radio fuze is a one-time action system, a large amount of data is required to make comprehensive statistics. The cost is high; the static simulation of the laboratory is to use the device to simulate the echo signal of the dynamic rendezvous, and test the starting parameters of the radio fuze. The environmental parameters are controllable, the repeatability is good, and the efficiency is high.

At present, most of the start-up performance tests of pulse Doppler system fuzes use methods such as aircraft model flying or special system simulation. The method of aircraft model flying is insufficient: time-consuming, laborious, high cost, and limited speed range

"Its shortcomings: (1) The hardware system is relatively complex and the scalability is not good; (2) The control software needs to perform complex signal generation and timing control

[0005] In the paper "Research on Target Simulation Technology of Missile Guidance Simulation Test System" published in "Fire Control Radar Technology" Vol. Delay, the method of simulating target echo delay mainly includes radio frequency delay and video delay. Because video delay needs to extract radar transmission pulse signal, the technology is difficult and the coherence is difficult to guarantee, which cannot meet the requirements of modern radar target simulation.

At present, the relatively mature radio frequency delay technologies mainly include optical fiber delay, digital radio frequency memory delay and surface acoustic wave delay, etc. The commonly used surface acoustic wave delay in the past has poor signal quality and narrow bandwidth

The optical fiber delay method has good coherence, simple implementation method, and good signal quality, but it is bulky and expensive, and because it is multi-stage cascaded, the noise floor is very high after multiple attenuation and amplification, and it is easy to generate unwanted false signals. Target signal"; "With the development of digital sampling and storage technology, DRFM has become an important means of current target simulation, limited by the current device level, DRFM can only work at intermediate frequencies, so for high frequency signals, it must first be processed Down-convert multiple times, convert to intermediate frequency signals and then process them, and then restore the signals through up-conversion after processing.”

Disadvantages: (1) Multiple up- and down-conversions make the system relatively complicated, and the mixer needs to be adjusted and replaced according to the change of the operating frequency point; (2) The delay of the system itself needs to be accurately checked; (3) It is easy to introduce noise

[0006] Deficiencies in the establishment of a dedicated system simulation method: poor scalability, troublesome parameter changes such as rendezvous speed, and poor parameter accuracy

In the echo simulation of the pulse Doppler system fuze using the radio frequency simulation method, due to the time asynchronous between the tested fuze and the instrument equipment and the temperature drift of the fuze clock, the delay error in the simulated projectile rendezvous process is relatively large , the speed accuracy of the simulation is poor

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