Lviv Radio Engineering Research Institute (LRERI), Ukraine

PURPOSE

This manual provides general operating and maintenance instructions for the BS-3 ballistic station, which is small-lot produced by the LRERI in small lots.
The BS-3 is intended for measurement ballistic object movement parameters (at least weapon projectile initial velocity and one of the parameters characterizing the velocity change).
Functional principle of the BS-3 operation is phase tracking of frequency shift signal, which is reflected from the moving target.
BS-3 is intended for operation in field conditions under any atmospheric conditions, in the day and night time.
BS-3 may be placed on the firing-artillery weapon or tripod mounted.

DESCRIPTION

a) The basic BS-3 equipment consists of an antenna/bracket assembly, a portable control and display unit, a 100-meter antenna cable, a power cable, and a transport case to house and transport the equipment. Options include a cable drum, a tripod, Ac- to-Dc converters, and a ballistic software package.
b) Antenna/Bracket Assembly. This assembly consists of the antenna attached to the bracket assembly. The antenna assembly contains the mirror circular polarization antenna, isolation section for the sounding and reflected signal, transceiver, power supply, radio frequency self-test circuitry, and a circuit for initial analogous signal processing, BS-3 measurement operation start unit (by the muzzle flash and electric trigger signal or (and) shock wave) When it is necessary, the start may take place by the signal of accelerator placed on the weapon and connected to it with the special cable.
The bracket assembly provides a standard mechanical connection to different mounting brackets fixed on a weapons. Alignment holes and a guide bolt with the turn handle are provided on the bracket assembly to secure it on the gun mounting bracket.
Equipment for the determination of antennas assembly and gun barrel mutual location determination includes measuring reel, foresight and bench mark signs.
c) Control and indication unit. The processing and indication unit includes indicator, circuit for information secondary processing and ballistic calculations and interfaces hardware. This unit is connected to the antenna assembly by an antenna cable and performs all controls operations. A keyboard allows operating mode selection and the display provides readout of measurement and self-test results.
d) Cables and Optional Cable Drum. A 5-meter power cable and a 100-meter antenna cable are supplied with the BS-3. An optional cable drum is used for accelerometer.
e) Transport Case. The transport case is foam lined. It has recesses for storing of the antenna/bracket assembly, control and indication unit, the power cable assembly, and the antenna cable assembly with or without the drum.
f) Optional tripod. An optional tripod is available for mounting the antenna/bracket assembly remotely from a gun when desired.
g) Optional Ac/Dc Converter. Optional Ac/Dc converter for converting 110 or 220 Vac  to 24 Vdc system primary power are available
h) Optional Ballistic Analysis Software. An, optional software package m IBM format is designed to provide the velocity/tune and velocity/distance plots on the base of measurement using an IBM compatible computer.

BASIC SPECIFICATIONS

Basic specifications for the BS-3 equipment are provided in table 1.
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Proprietary Data

Table 1. Basic specifications
 
 

Function	Characteristics
System  Projectile Types Measured	All types including base-bleed, sabot, mortar, tracers,  small caliber
Weapon Caliber	5.56 to 406 mm
Velocity Measurement Range	30 to 3,000 meters per second
Overall Measurement Accuracy	±0.05 %
Data Provided on the display	Muzzle velocity; average muzzle velocity;  Standard Firing Table velocity;  calibrated velocity for nonstandard conditions;  parameters characterizing muzzle velocity variation;  measurement point data;  ballistic analysis data:  time of projectile movement in the barrel
Input Power Requirements
Voltage	22 to 32 Vdc with a standard 100-meter antennas cable
Power Consumption	60 W in a measuring operation and 15 W in waiting  operation
ANTENNA ASSEMBLY
Input Power Requirements
Voltage	22 to 32 Vdc
Power Consumption	45 W
Antenna Characteristics	Circular polarization Antenna
Gain	Greater than 37 dB
Beamwidth	2.5° x  2.5°
Sidelobe Level	Less than 12 dB
Squint Angle	0,5°
Receiver
Bandwidth	10 KHz to 1,3 MHz (equal to projectile velocities of 30  to 3,000 m/s)
Transmitter
Frequency (Selectable)	L-M range
Power Output	0.2 W
DSP Processor
Processing Technique	frequency shift signal phase tracking
Memory	1,000 shot:. (Nonvolatile)
Data Output Format	RS232 (Standard)  RS422 (Optional)  RS 485 (Optional)
RS232/RS422/RS485Description
Data Bits	8
Stop Bits	1
Parity	None
Baud Rate	200 000
Antenna Connector Data
I/O Connector	2
I/O Mating Connector	2
Processing and Indication Unit
Power Requirements	15 W
Voltage	22 to 32 Vdc (with 100-meter cable)
Power Consumption	10 W
Display Type	LED - 256 digit
Display Format	Velocity displayed to 7 digits
Display Resolution	0.03 m/s
Displayed Data	Muzzle velocity; average muzzle velocity; Standard Firing Table velocity; calibrated velocity for nonstandard conditions; parameters, which characterize muzzle velocity variation; measurement point data;ballistic analysis data
System Environmental Characteristics
Operating Environment Temperature	Unsheltered per MIL-STD 810D
Operating	-40° to 60° C (-72° F to 108° F)
Non-operating	-45° to 65° C (-81°F to 117 ° F)
Altitude
Operating	10,000 feet
Non-operating	50,000 feet
Humidity	100 percent (relative)
Radiation Hazard	Less than 1 mW per square centimeter
PHYSICAL CHARACTERISTICS
Antenna
Dimensions (H x W x D)	300 x 230 x 250  mm
Weight	10.3  kg
Antenna Bracket
Dimensions (H x W x D)	300 x 230 x 170 mm
Weight	4 kg
Display Unit
Dimensions (H x W x D)	290 x 224 x 130 mm
Weight	5,2 kg
Cables
Power Cable Length	5 m
Antenna Cable Length	100 m  standard
Weight	(Power and Antenna Cable) 13 kg
Transport Case
Dimensions (H x W x D)	370 x 490 x 270 mm
Weight	16.5 kg