Ch. 10 (ESM) Flashcards
ESM System Designator
AN/ALQ-210
ESM System Components
ESM Receiver/Processor
4 Antennas
ESM Primary Bands and Associated Antennas
Low Band (2 spiral antenna elements) High Band (2 spiral antenna elements)
Antenna Coverage
Each antenna has a minimum of a 100 degree FOV enabling a full 360 degree with overlap and AOA determination.
ESM to SSDP
The ESM system interfaces with the ASE system for threat alert. The SSDP, as bus controller, commands the ESM system to transfer emitter data that has been determined to be a threat to the helo.
ESM to AOP
The ESM system is a remote terminal on the 1553B bus. The AOP, as bus controller, commands the ESM system for initialization, MDL transfer, mode control, status, and transfer of emitter data. The ESM data is then displayed on the geosit and ship compatible data is sent to the ship via Hawk.
Blanking Inputs
Blanking inputs are provided to minimize the interference effects of onboard transmitter signals.
ESM in Utility Mode
Without MDL’s loaded on the cards or sticks the ESM system will default to a maintenance MDL. The ESM system will appear to work normally, however in reality it is only looking for two maintenance emitters and will not detect any real world emitters.
On initial power application ESM does what
ESM does not load and run immediately. The operator must wait 5-6 minutes before the system goes to operational mode.
The startup/initialization sequence has failed, an ESM fail indications is displayed on the DIAG page. What has happened and what steps do you take to fix it?
The ESM has automatically deconfigured.
To recover:
1. Reinitialize and allow the system time to initialize (5-6 minutes).
2. If the system fails to reinitialize, perform the ESM Troubleshooting procedure and again allow time for the system to initialize.
While initializing your 2P commanded an auto test causing the system to load incorrectly. How do you fix this?
Both the ESM and MC must be power cycled.
RWR and ESM Relationship
Although they are shown independently on the DIAG they are the same receiver. Actions that disable one will disable the other. Deconfiguring one will deconfigure the other. The RWR is functional once the ESM is fully online.
How long are ESM bearing lines displayed for?
15 seconds
ESM Declutter
With ESM decluttered emitters that have be define in the DEF EOI window as well as emitters that are marked as HTWs will still display.
ESM Sector Windows
The ESM Sectors will suppress MFD display of emitter reports in specified sectors. However contacts are still processed. HTWs and EOIs are not hidden on the MFD.
Radar Scan Types
Steady
Circular
Sector
Scan Period
The time an emitter’s beam sweep through the same area of space
What is the point of a Scan Modulation Analysis
SMA is a tool with which the operator can potentially break up ambiguities in areas with multiple emitters with similar or overlapping parameters to precisely identify emitters
Is SMA automatic?
No, it must be selected
SMA considerations
When a SMA is commanded the receiver must stare at the emitter of interest for the defined dwell time. The receiver is dedicated to the selected beam. The aircraft must remain within the emitters beam for the entirety of the SMA. No new emitters will be detected and no existing emitters will be updated for the entirety of the SMA.
SMA default dwell times
10 seconds or a prescribed time in the MDL.
Dwell Time range
0-300seconds
How many SMA request can the system accept
3
How do you stop a SMA while its in process
Select the SCAN MOD function and enter 0 seconds
Two Methods of Locating Emitters
Parametric Electronic Order of Battle (PEOPB)
Long Baseline Interferometry (LBI)
Ways to Initiate a Location Measurement
Auto Location Candidates from the MDL
Operator Requested
Data Fusion Requested
Ownship Requested
EBT
Emitter Behavior Table
How often will an Auto location candidate update
If the emitter is marked as slow moving in the EBT the emitter location will update periodically. If the emitter is not marked as slow moving it will only be located once.
How many Operator Requested ESM locations can be initiated.
16
Two Emitter Location Functions
PEOB (Parametric Electronic Order of Battle)
LBI (Long Baseline Interference
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