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In the previous Viper video, we talked about using the FIX option on the ICP to update the Inertial Navigation System, or INS. While the onboard GPS can certainly assist with updating the INS, INS drift can still happen. This is not only true for a fix position as stored in the mission computer mission planning table, but also for altitudes. To calibrate for altitude drift, we have the altitude calibration, or A-CAL, function from the ICP.

To enable A-CAL, we’ll select button 9 on the ICP. Upon doing so, the A-CAL DED page is displayed. By default, the GPS automatic A-CAL options is enabled. This allows the onboard GPS to update elevations, or both. However, we’ll Dobber right to enable manual calibrations. If we lost our GPS or was denied in some way, this will be useful.

As with FIX, we have options to manually calibrate a steerpoint altitude by pressing ICP 0 to 9These include radar altimeter, fire control radar, the heads-up display, and the targeting pod.

Unlike FIX, A-CAL allows us to calibrate the altitude, position, or both at the same time by pressing right on the Dobber switch. For this example, we’ll just calibrate the altitude.

If we want to go back to automatic A-CAL using GPS, Dobber down to the Manual and press M-SEL on the ICP.

First, let’s look at using the radar altimeter. We first need to determine the steerpoint altitude to calibrate as indicated in the top right corner of the DED. In this case, Steerpoint 1. The Elevation line indicates the stored mission planning table altitude for the selected Steerpoint, and below that is the difference, or Delta, between this stored altitude and the current radar altimeter indication. To calibrate using this method:

1. Select NAV master mode
2. Select A-CAL from ICP
3. Select MAN calibration
4. Verify RALT as method
5. Verify Steerpoint to calibrate
6. Verify ACAL on HUD
7. When directly over the Steerpoint to altitude calibrate, press TMS forward
8. Press Enter in the ICP to save and return the DED to the CNI

To use the Fire Control Radar as the calibration sensor, we’ll Dobber right to select it and bring up the FCR on the left MPD.

1. Select NAV master mode
2. When 10 nm or less from the Steerpoint to calibrate, select CRM and then GM FCR mode, set FCR as SOI, ensure the crosshairs are over the Steerpoint, and TMS forward to set the FTT and freeze.
3. Select A-CAL from ICP
4. Select MAN calibration
5. Verify Steerpoint to calibrate
6. Verify ACAL on HUD
7. Select and verify FCR as method
8. Press TMS forward to calibrate
9. Press Enter in the ICP to save and return the DED to the CNI

Next, we’ll use the HUD as the calibration method.

1. Select NAV master mode
2. Select A-CAL from ICP
3. Select MAN calibration
4. Verify Steerpoint to calibrate
5. Verify ACAL on HUD
6. Select and verify HUD as method
7. Set HUD as SOI
8. Use the cursor switch to slew the Steerpoint diamond on the HUD over the Steerpoint location
9. Press TMS forward to calibrate
10. Press Enter in the ICP to save and return the DED to the CNI

Last, we’ll use the Targeting Pod.

1. Select NAV master mode
2. Select Steerpoint to calibrate
3. Select TGP, set TGP as SOI, ensure the crosshairs are over the Steerpoint, and TMS forward to set as a Point Track
4. Select A-CAL from ICP
5. Select MAN calibration
6. Verify Steerpoint to calibrate
7. Verify ACAL on HUD
8. Select and verify TGP as method
9. Enable and fire the laser to create range data
10. Press TMS forward to calibrate
11. Press Enter in the ICP to save and return the DED to the CNI

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