SSRF Joint Restricted Frequency List (JRFL)

A Joint Restricted Frequency List is a list of frequencies that must be protected while friendly offensive EW operations are taking place. [Ref CJCSM 3320.01] The Joint Restricted Frequency List (JRFL) is a list of frequencies that must receive various degrees of protection. The JRFL contains frequencies that assigned to one of three categories: Taboo, Protected or Guarded.

• TABOO

  Any frequency of such importance that it must never be deliberately jammed or interfered with by friendly forces. This includes international distress, stop buzzer, safety and controller frequencies. Component operations and communications elements designate and update this list.

• PROTECTED

  Friendly forces operational frequency of such critical importance that jamming should be restricted unless necessary or until it is coordinated. Component operations and communications elements designate and update this list.

• GUARDED

  Enemy frequencies currently being exploited for combat information and intelligence. This list is time-oriented in that the list changes as the enemy assumes different combat postures. These may be jammed if the Information Operations (IO) cell determines the operational gain is greater than the information lost. The J-2 (Intelligence Officer) designates and updates this list.

Roles, Responsibilities And Procedures

The JRFL must be compiled in co-ordination between J6 (Communications), J3 (Operations) and J2 (Intelligence) communities. This coordination is necessary because frequencies used by J2 (for intelligence collection or other purposes), by J3 (for EW/INFO OPS purposes), and by J6 (for command and control), must be deconflicted.

Business Use Cases For JRFL Definition

The Table of Allocation provided by the Host Nation should be imported and stored in the respective spectrum management systems. The business process is detailed in the Activity Diagram below.

Activity Diagram for JRFL Definition

JRFL is the XML root for all parameters of a JRFL. It inherits attributes and sub-elements from element Common. Sub-Element is JRFLEntry.

Table of Allocation (TOA) Data Object

Example JRFL Entry:

<JRFL cls="U">
  <Serial cls="U">NLD::JR:123</Serial>
  <EntryDateTime cls="U">2011-12-25T00:00:00Z</EntryDateTime>
  <JRFLEntry>
    <ProtectionCode cls="U">Protected</ProtectionCode>
    <Justification cls="U">distress frequency</Justification>
    <FreqMin cls="U">243</FreqMin>
    <Bandwidth cls="U">0.1</Bandwidth>
  </JRFLEntry>
</JRFL>

See the OpenSSRF Javadoc for more details.