Multifunction Radar and Multifunction Radar Jamming Constraints

A multifunction radar models a collection of radar beams. The beams work together at the same location. Access constraints for multifunction radars model this behavior. At any given time, each beam is able to compute a chosen radar Search/Track metric value (i.e., Single Pulse SNR, Integrated P Det, DwellTime, etc.). The multifunction radar system aggregates the individual beam values at a given time. The system assigns its value at the given time using two methods.

  • Maximum Across Beams. This is the maximum value of all values computed for the multifunction radar’s beams. Only active beams that are available at the given time are considered.
  • Minimum Across Beams. This is the minimum value of all values computed for the multifunction radar’s beams. Only active beams that are available at the given time are considered.

Multifunction radars provide both Maximum Across Beams and Minimum Across Beams for several Search/Track metrics. They are set as Min/Max constraints.

The sections below provide the following information:

 

Multifunction Radar constraints

Search/Track Metric Aggregation Method Description
Dwell Time Maximum Across Beams The maximum dwell time (i.e., the sum of the integration time and RF propagation delays) across all active available beams
Minimum Across Beams The minimum dwell time (i.e., the sum of the integration time and RF propagation delays) across all active available beams
Integrated P Det Maximum Across Beams The maximum integrated probability of detection across all active available beams
Minimum Across Beams The minimum integrated probability of detection across all active available beams
Integrated SNR Maximum Across Beams The maximum integrated signal-to-noise ratio across all active available beams
Minimum Across Beams The minimum integrated signal-to-noise ratio across all active available beams
Single Pulse PDet Maximum Across Beams The maximum single pulse probability of detection across all active available beams
Minimum Across Beams The minimum single pulse probability of detection across all active available beams
Single Pulse SNR Maximum Across Beams The maximum single pulse signal-to-noise ratio across all active available beams
Minimum Across Beams The minimum single pulse signal-to-noise ratio across all active available beams

Multifunction Radar Jamming constraints

Multifunction radars support constraints that model jamming of the main channel of the radar receiver. The search/track parameters take polarization mismatch into account if:

  • radar receiver polarization is set
  • the jammers are polarized

For more information about jamming and constraints, see SAR Constraints with Jamming.

Search/Track Metric Aggregation Method Description
Dwell Time Maximum Across Beams Jamming The maximum dwell time (i.e., the sum of the integration time and RF propagation delays) across all active available beams in the presence of jamming
Minimum Across Beams Jamming The minimum dwell time (i.e., the sum of the integration time and RF propagation delays) across all active available beams in the presence of jamming
Integrated J/S Maximum Across Beams The maximum integrated jammer-to-signal ratio across all active available beams.
Minimum Across Beams The minimum integrated jammer-to-signal ratio across all active available beams
Integrated P Det Maximum Across Beams Jamming The maximum integrated probability of detection across all active available beams in the presence of jamming
Minimum Across Beams Jamming The minimum integrated probability of detection across all active available beams in the presence of jamming
Integrated S/(N+J) Maximum Across Beams The maximum integrated signal-to-(noise plus jamming) ratio across all active available beams
Minimum Across Beams The minimum integrated signal-to-(noise plus jamming) ratio across all active available beams
J/S Maximum Across Beams The maximum jammer-to-signal ratio across all active available beams
Minimum Across Beams The minimum jammer-to-signal ratio across all active available beams
Single Pulse P Det Maximum Across Beams Jamming The maximum single pulse probability of detection across all active available beams in the presence of jamming
Minimum Across Beams Jamming The minimum single pulse probability of detection across all active available beams in the presence of jamming
Single Pulse S/(N+J) Maximum Across Beams The maximum single pulse signal-to-(noise plus jamming) ratio across all active available beams
Minimum Across Beams The minimum single pulse signal-to-(noise plus jamming) ratio across all active available beams

Usage examples

Using a Min value for Integrated P Det Maximum Across Beams

When you specify a Min value for the Maximum Across Beams option, STK models this situation:

At least one beam’s value is greater than or equal to the specified Min value.

This situation models the ability of the multifunction radar to detect the target. At least one of the beam’s integrated probability of detection values is high enough to be detected. The Min value represents the high value.

Using a Max value for Integrated P Det Maximum Across Beams

When you specify a Max value for the Maximum Across Beams option, STK models this situation:

Each beam’s value is less than or equal to the specified Max value.

This situation models the ability of the target to avoid detection by the multifunction radar. Each beam’s integrated probability of detection value is too low to be detected. The Max value represents the value needed for detection.

Using a Min value for J/S Minimum Across Beams

When you specify a Min value for the Minimum Across Beams option, STK models this situation:

Each beam’s value is greater than or equal to the specified Min value.

This situation models the complete jamming of the multifunction radar. Each beam’s J/S value is high enough to show a jammed beam. The Min value represents this high value.

Using a Max value for J/S Minimum Across Beams

When you specify a Max value for the Minimum Across Beams option, STK models this situation:

At least one beam’s value is less than or equal to the specified Max value.

This situation models when at least one of the multifunction radar’s beam is not jammed because that beam’s J/S value is low. The Max value represents this low value.