Along with high tech rapid development, information technology, optoelectronic technology, electronic technology and so on along with it rapidly expand, thus causes the military electronic technology rapidly expand. For the adaptation military technology the tendency which to the informationization, the intellectualized direction developed, the research has designed this kind of multi-channel remote control explosive charge. This multi-channel remote control explosive charge (Remote Bombing Trigger) is the Artillery troops when the war game, takes the training one kind of equipment, may also take the mine and the project demolition one kind of demolition equipment.
First, system design plan
(one) system system design
This system mainly by the transmitter unit, the receiver unit and the blasting cap is composed. The master control transmitter and receiver’s wireless remote control is away from is not smaller than 3km; The transmitter may control six receivers separately; Each receiver undertakes 150 groups to explode at most; Each group line long does not surpass 450m; Each group explodes ability is 2~4 OMEGA military blasting caps; Guaranteed that the online length is under the 450m condition, safely reliably detonation each group; The transmitter may control remotely the establishment 150 group blasting cap’s detonation ways which controls: Simultaneously the detonation, is separated some fixed time detonation, to elect to explode, as shown in Figure 1.
Chart l system’s structure diagram
(two) transmitting end design
The launch unit mainly by the control panel design, the monolithic integrated circuit control circuit, the liquid crystal display, the keyboard, the instruction output circuit, the carrier frequency produces the electric circuit, the tone circuit, the signal enlargement filter circuit and the power impetus electric circuit is composed, mainly completes accepts functions and so on keyboard entry instruction, digital coding, signal modulation, signal launch, as shown in Figure 2.
Figure 2 launch unit diagram
(three) receiving end design
Accepts the unit by simulated signal processing electric circuits as well as the synchronized signal extraction electric circuit and so on high-frequency amplification, mixing, supersonic amplification, discriminator digital signal instruction circuits and so on monolithic integrated circuit control circuit is composed, completes the signal to accept, functions and so on demodulation, decoding, and issues a license the instruction output the good organization, controls its condition and the movement, as shown in Figure 3.
Figure 3 receiving element diagram
(four) the single-channel gets up explodes the circuit design
The receiver in completes the instruction compared to after the correctness, will issue the charge instruction. Must make the armed electric capacity in short-time asking to have explodes the stored energy.
According to the request, the receiver to blasting cap’s line length is 450m. Uses the usual anti-back guy and the blasting cap connection. Line resistance approximately in 35~120 OMEGA, but blasting cap’s resistance is 2~4 OMEGA, like this, if in the receiver end stored energy, the request excitation voltage is high, the stored energy capacity is big, the line resistance wants the small anti-back guy. Such receiver’s cost, the volume greatly will increase. Adds it: the 450m line long will receive the static electricity, the thunder and lightning and so on each kind of electromagnetic wave disturbance. In high-pressured charging and discharging situation, existence big wire-to-wire capacity. This will bring many unsafe factors. The design considered that the charging circuit will place the thunder jet, takes the disposable consumption, such receiver’s charging voltage is low, the volume big reduction, has many favorable factors. Work arrangement schematic drawing like chart 4.
Second, the system realizes
(one) chip shaping
Main chip: .AT89C52,AT89C2051,MC2833,MC3361,FX589 and so on.
Figure 4 arrangement schematic drawing
This multi-channel remote control explosive charge including launches and accepts two major parts, the two as CPU realize take the monolithic integrated circuit, the transmitting end selects AT89C52, the receiving end selects AT89C2051. The information transmission and accepts is completes under the monolithic integrated circuit CPU common control. MC2833 and MC3361 complete the instruction the modulation and the demodulation. FX589 uses for to realize the signal synchronization.
(two) FX589 chip synopsis
From raised receiver’s working speed, the reliability and reduces the hardware scale, to reduce the power loss the goal to embark, has selected integration high speed modem FX589, in this explosive charge we were the synchronization which realized using FX589 launches and accepts.
FX589 is one uses in the wireless data transmission the monolithic integration synchronous modulation demodulator. Through uses most the young Gauss frequency-shift keying modulation, FX589 has the very wide data rate, its data rate Fan Zhongcong 4kb/s to 64kb/s. May realize the number through the piece end programming to absorb the speed and the BT choice (0.3 or 0.5), meets the different system’s needs. Its principal characteristic is:
The data rate is 4 kb/s~64kb/s;
Full-duplex or half-duplex young Gauss frequency-shift keying modulation (GM-SK)
May choose BT: (0.3 or 0.5)
Low power loss,
3.0V,20kb/s,1.5mA typ.
5.0V,64kb/s,4.0mA typ.
Suits PCMCIA/PC the card small TSSOP seal form this component to be possible to use in selling the terminal node, using between PC, the portable computer and printer’s low power loss wireless aspects and so on between data connection, GPS and difference GPS data transmission, motion wireless data application.
The FX589 data transmission and the receive use the serial mode, and transmission which or receive clock synchronization produces with the modem. Uses the electricity saving pattern the independent transmission either the receive may use the full-duplex or the half-duplex way works. The receive data’s input level may by use on the piece to input the exchange which or the cocurrent regulation circuit around amplifier’s exterior part is composed establishes. Because used the receive data input control to examine, to maintain the input level, caused the receive data signal the gain, to lock and to maintain becomes easy, and might in needed time carried on the hypothesis through the microprocessor. Received signal’s quality may demonstrate through the receive signal-to-noise ratio. The FX589 working voltage scope is 3.0 V~5.5V. FX589 is 24 foot integrated circuit, has pastes the piece type and the double row in-line type many kinds of seal forms, see Figure 5 and Figure 6.
Figure 5 FX589 system diagram
Figure 6 the FX589 exterior part connection shows must attempt
(three) the system realizes the principle
This system use keyboard and the liquid crystal display composition user operation connection, the first user enters the instruction by the keyboard, inputs the monolithic integrated circuit, completes the instruction in the monolithic integrated circuit the code and outputs from the instruction output circuit the instruction in the tone circuit which is composed of the MC2833 chip to carry on to the instruction the FSK modulation, modulates the good signal after the frequency multiplication, the high-frequency amplification, the power amplification and the aerial balance network launches by the antenna the instruction. The receive origin antenna receives radio-frequency carrier signal after high-frequency amplification sends in the mixer to carry on the mixing to the signal to obtain the first intermediate frequency signal, this intermediate frequency signal after enlargement enters the second mixing which and frequency discrimination electric circuit is composed after MC3361 obtains the low frequency command pulse, carries on the enlargement after it sends in synchronizing circuit which is composed of FX589, then sends in together the command signal and the synchronized signal the monolithic integrated circuit, completes the instruction in the monolithic integrated circuit the decoding, will decode the instruction outputs the implementing agency to control its condition and the movement.
Third, experiment
The test result following table 1 shows. Sees from the test result, remote control receiving and dispatching system’s each target achieves or surpasses meets the requirements the technical specification, satisfies the operational performance request completely, has served the design purpose.
Table 1 test result
