SkySim Disturbance Filtering & Analysis I -  Description & Datasheet


This first package of electronic counter-countermeasures supports in detecting various forms of jamming and range deception jamming. It can work in conjunction with the NextGen 8 GHz Pulse radar or the simulator SkySim.

The package can be applied in the following scenarios:

  • Full simulation (radar and jammer are simulated)
  • Real radar and real jammer


Defense against Disturbances and Jamming Attacks, in particular:

  • spot jamming detection
  • barrage jamming detection
  • active target detection
  • detection of range deception 
  • detection of range gate pull-off (RGPO)
  • clutter-map enhanced detection of RGPO
  • MTI enhanced detection of RGPO
  • MTD enhanced detection of RGPO
  • Kalman enhanced detection of RGPO

The composite algorithms possess a varying set of sub-blocks.

Automatic Threshold based on MaxValue x x x x x
Associate Radar Reflections into one object x x x x x
Store Object Information x x x x x
Detect RGPO x x x x x
Velocity Gating     x x x
Target Association       x x
Prediction         x


Detect Barrage Jamming

Barrage jamming spreads energy across a wide frequency range. Such a jamming of an attacked radar requires high power to achieve a continuous coverage of various frequencies. Given the jammer's fixed total radiation power, this technique lowers the radars general efficiency as it leads to a low power density. But this technique is efficient when attacking radars which can vary their frequencies or radars which operate with several frequencies concurrently.

The video above shows barrage jamming as generated in SkyRadar's DSP simulator. Alternatively, students might practice with SkyRadar's physical jammer.

Detect Spot Jamming

A workaround to the barrage jammer's low efficiency is spot jamming. Spot jammers jam in a narrow band, hence with a higher power density. Consequently it can raise the jamming signal power over a narrower frequency spectrum.

Detect Active Targets

An active target is a simple architecture to change the position of a target. It is equiped with

1) One antenna to detect the surveillance radar's pulses

2) An amplifier to enlarge the feedback amplitude. 

3) One antenna to return the  amplified signal back to the surveillance radar.

The delay of the deceived reflection signal is proportional to the length of the wires, connecting incoming and outgoing antennas with the amplifier.

This detect algorithm detects and eliminates deceived reflections. It can work with simulated and real signals.

RGPO Disturbance Filtering

The RGPO Detection Block is an essential component of a radar system designed to detect and handle range deception data. 

This block includes several subfunctions, each serving a specific purpose in the processing of incoming radar reflections to identify and manage potential range-deceived targets. Read more.

MTI Enhaned Disturbance Filtering

The RGPO enhanced disturbance filter is an advancement as compared to the simple RGPO-based filter. It improved the functionality of the composite block by adding the MTI feature. Read more.

Clutter-Map Enhanced Disturbance Filtering

The composite block of clutter-map enhanced disturbance filtering makes use of clutter-map subtraction.  In addition it includes automatic thresholding, the association of reflections into one object, the RGPO detection block, and velocity gating. Read more.

MTD Enhanced Disturbance Filtering

The MTD enhanced disturbance filter makes use of the Moving Target Detection Algorithm. It is similar to the Clutter-map enhanced filter, with an additional target association block. The MTD replaces the Clutter-map subtraction block. Read more.

Kalman Enhanced Disturbance Filter

The Kalman enhanced filter is the most complex in this package of composite filters. Kalman filters out non-predictive vlaues. In comparison to the previous fliter, it also includes a specific prediction block. Read more.