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The company for the supply and support of state of the art instrumentation for use within Ballistics R&D and proof testing.

Internal Ballistics

Products designed for the study and analysis of the processes originally accelerating a projectile.

External Ballistics

Products designed for the study and analysis of the flight of a projectile through the air.

Terminal Ballistics

Products designed for the study and analysis of the interaction between a projectile or explosion and its intended target.


B481 Doppler Radar HPI

Photo: B481 Head.

The Doppler principle states that a reflected radar signal from a projectile will be frequency-shifted by a value fd relative to the transmitter frequency f0, and that the frequency shift will be proportional to the radial velocity v of the projectile relative to the antenna.

The mathematical relation is: fd=(2* f0 * v) / c. Where: fd is the Doppler frequency; F0 is the transmitter frequency of the radar antenna unit; v is the radial velocity of the projectile; c is the speed of light.

HPI have used these principals and years of ballistics application knowledge to develop their 2nd generation Doppler Radar solution, great emphasis was placed on giving the customer the features , functionality and reliability needed whilst offering a value for money solution to their application needs.

Image: B481 Vel vs Time.

Main specifications:

Calibre range: from 3mm upwards
Measuring distance: depending on calibre, (e.g. 5.56 mm - 20 m, 9 mm - 40 m)
Velocity range: approx. 20 m/s to 2000 m/s (option 3000 m/s)
Intrinsic system accuracy: < 0.1%


Image: B481 Set Dia.

Muzzle blast wave sensor including:

  • 20m cable, can be used instead of the built in
  • Acoustic Sensor of the B481-AU Antenna Unit.
  • Connector: 6 pin MIL standard
  • Mounting thread: 1/4-20 UNC
  • Power supply: via Antenna Unit


Compact and rugged design (240 x 18 5 x 55mm)each containing:

  • 2.0 USB Interface
  • A/D Converter, resolution 16 bit
  • Built-in signal conditioning
  • Multiple radar support
  • External power supply unit 24VDC
  • Status LEDs
  • Operating temperature: 0 to 40°C



  • Velocity analysis
  • Flexible report generation
  • Real time data acquisition, analysis and display
  • compatible with other HPI Software Modules e.g. pressure, hit pattern