Interference Modeling and Simulation

Simulate Interference Conditions and Threats

The CAST Navigation Jammer simulation systems are designed to facilitate and support the testing, verification, and integration of single element Fixed Reception Pattern Antenna (FRPA) systems as well as multiple-element anti-jam antenna sub-systems such as Controlled Reception Pattern Antennas (CRPAs). These systems are an ideal solution for military and commercial laboratories where interference signal capability is required. CAST Jammer sub-systems provide precisely controlled signals for use in most types of GNSS testing applications, emulating interference conditions and threats that can occur in both urban and hostile environments.

CAST interference simulation systems let users define and control multiple interference parameters, including output signal waveform types, output power level, jammer signal source location, speed, heading and motion. Each of the individual jammers can also be programmed to turn on or off (pop-up) during the execution of a scenario.

The systems can support up to 8 individual antenna output elements, with each individual antenna output element programmable, to generate interference signals from different locations and different powerlevels. Each individual antenna element supports up to 8 independently controlled interference waveform types, simultaneously created using CAST proprietary FPGA technology, to produce a clean waveform with very low intermodulation noise.

JAMMER Simulation System Features

Control multiple interference parameters including jammer location, speed, heading, motion, output signal waveform types, power levels and more options

Ideal solution for military and commercial laboratories where an interference signal capability is desired

Waveforms are created using CAST proprietary FPGA technology, producing a clean waveform with high output power and very low intermodulation noise

Each output element can be programmed to generate interference signals from different locations, and at different power-levels

Operate in Real-Time Mode or Canned Mode

Each CASTJammer can be assigned an initial speed, altitude, and either a stationary or a dynamic trajectory. Interference signals are transmitted commensurate with the GNSS signal “assigned” to each of the individual antenna elements, all precisely controlled to present an accurate and proper signal to the unit(s) under test, even during high dynamic conditions.

The jammers provide >130db of Interference Signal Power from nominal GNSS output levels. Operating in either real-time mode or canned mode, CAST Broadband Noise signals are optimized to deliver Gaussian amplitude distribution with adjustable power output levels.Interference scenarios are 100% repeatable assuring consistent results.

CAST Jammer systems can be fully integrated into any of the CAST GNSS products or retrofitted into a previously fielded CAST system. Controlled through our proprietary synchronization technology, interference signals and the GNSS signals are combined and output as a composite signal for each individual element. In phased-array multi-element antenna (CRPA) types of systems, the GNSS and interference signals for each antenna element are spatially offset and phase coherent with each other reflecting real life phase differences in the signal reception at the phase center of each antenna element. These GPS + Jammer waveforms are generated separately for each one of the CRPA antenna elements, insuring a coherent GPS + Jammer waveform arrival for each CRPA antenna element with respect to the navigation point.

CAST Jamming Specifications

Output Frequency Bands

L1, L2 and L5

Signal Level

Jammer Signal Range: 173dB
Jammer Signal Level: -203dBW to -30dBW

Jammer Vehicle Dynamics

Velocity: > 60,000 m/s
Acceleration: ± 150,000 m/s2
Jerk: ± 150,000 m/s3

Signal Accuracy

Pseudorange: 1 mm
Pseudorange: Rate 1 mm/s
Delta Pseudorange: 1 mm
Interchannel Bias: < 1 mm
Uncontrolled Bias: < 1 mm
Bias Repeatability: (initial) < 1 mm
Bias Stability: (operational) < 1 mm

Modes of Operation

Pulsed CW: Rate: 0.01Hz-100KHz
Swept CW: Rate: 0.01Hz-100KHz, Duty Cycle 1%-99%
Swept CW: Sweep Types: Sinusoid, Triangle, Ramp Up/Down
Swept CW: Bandwidth: 0.01Hz – 24 MHz
FM Noise: Bandwidth: 0.00Hz – 20MHz
WB Noise: Bandwidth: 24MHz
Binary Phase Shift Key: Bandwidth 24MHz