1B-CPR

The target id indicates the orientation of the spacecraft bus. For normal operations the target ID is 0. The complete ID table is listed below:

Control Frame 0
0: CPR to point in 300 seconds - Nominal science mode
1 - 15: Target ID for testing - not planned for operational use

Control Frame 0, CPR Calibration
16: CPR to point in 160 seconds
17: CPR 15º to the right
18: CPR 15º to the left
19: CPR 10º to the right -- default rotation
20: CPR 10º to the left -- default rotation
21: CPR 5º to the right
22: CPR 5º to the left
23 - 29: Target ID for testing - not planned for operational use
30 - 36: CPR rotation - not planned for operational use
37 - 39: Not planned for operational use

Control Frame 1, Four thruster closed-loop
40: Rotation into the OR orientation
41: Rotation into the x-track along the anti-ang momentum
42: Rotation into the x-track along ang momentum
43: Rotation into the orbit lower orientation
44: Rotation into alt. OR w/ CPR away from Sun
45 - 49: Not planned for operational use

Control Frame 2, One thruster open-loop
50: Rotation into the OR orientation
51: Rotation into the x-track along the anti-ang momentum
52: Rotation into the x-track along ang momentum
53: Rotation into the orbit lower orientation
54: Rotation into alt. OR w/ CPR away from Sun
55 - 59: Not planned for operational use

Control Frame 3, Two thruster open-loop
60: Rotation into the OR orientation
61: Rotation into the x-track along the anti-ang momentum
62: Rotation into the x-track along ang momentum
63: Rotation into the orbit lower orientation
64: Rotation into alt. OR w/ CPR away from Sun
65 - 69: Not planned for operational use

Control Frame 4, Four thruster open-loop
70: Rotation into the OR orientation
71: Rotation into the x-track along the anti-ang momentum
72: Rotation into the x-track along ang momentum
73: Rotation into the orbit lower orientation
74: Rotation into alt. OR w/ CPR away from Sun
75 - 80: Not planned for operational use

Control Frame 5
81: Body into the x-track along the anti-ang momentum
82 - 1023: Not planned for operational use

Flag indicating whether spacecraft is over land or sea:

1 = land
2 = ocean
3 = coast

The Radar calibration constant

Ray (frame) header Metadata Header information about each ray, its contents are defined in Table 1. Wavelength.

Noise floor when looking through antenna.

Number of pulses transmitted in one block of data.

Validity is a bit field that acts as a summary of some of the information from the Data_status field. Each bit = 0 for routine status, 1 for non-routine status. The non-routine situations follow:

0: Non-routine spacecraft orientation
1: Non-routine CPR mode
2: Receive only mode or transmit power is 0, bad calibration
3-7: Not used

The Sigma-Zero is the normalized surface cross section (not corrected for attenuation). It’s multiplied by 100 and stored as 2-byte integers

The fraction of bin # that the surface is off w/r to the corrected isurf. The preliminary assessment is that this is good to better than 1/100th of range bin (over good matches).

The radar transmission power, 4-byte float, determined from calibration peak detector.

Elevation in meters above Mean Sea Level. A value of -9999 indicates ocean. A value of 9999 indicates an error in calculation of the elevation.

Spacecraft geodetic longitude

Seconds since the start of the granule for each profile. The first profile is 0.

Range from the spacecraft to the CPR boresight intercept with the geoid.

The roll angle offset from nadir during normal operations. Positive roll results in the radar pointing to the right of the flight track. Negative roll to the left.

The UTC seconds since 00:00 Z of the first profile in the data file.