1. RESTORATION OF THE MARSIS SIGNAL FOR SUBSURFACE SOUNDING
N.A. Armand
Russian academy of sciences
Institute of Radio Engineering and Electronics
Mokhovaya str., 11,125009, Moscow, Russia

2. SIGNAL COMPRESSION

3. PHASE SHIFT CAUSED BY IONOSPHERE
SIGNAL DEFINITION
SIGNAL SPECTRUM
PHASE SHIFT CAUSED BY IONOSPHERE
WAVE NUMBER
TIME RELATIVELY TO THE GROUP ONE
ENERGY OF THE SIGNAL

4. HIGH-FREQUENCY APPROXIMATION
DIMENSIONLESS TIME
COEFFICIENT OF BROADBANDNESS
DIMENSIONLESS RELAX. TIME

5. Coefficient of broadbandness
IONOSPHERIC MODEL
Band number 1 2 3 4
Center frequency, MHz
1.8
3.0
4.0
5.0
Coefficient of broadbandness
0.28
0.17
0.13
0.10 
33.1
8.06
3.32
1.59

6. DISTORTION OF THE MARSIS PULSES

7. INVERSE FILTER

8. RESTORATION OF THE SIGNAL
PRELIMINARY CORRECTION
SECOND STEP CORRECTION

9. SPLITTING OF THE SIGNAL

10. COEFFICIENT OF SIMILARITY
UNIFORM SPECTRUM
ARRIVAL TIME

11. KOTELNIKOV’S THEOREM
ARRIVAL TIME
KOTELNIKOV’S HARMONICS

12. UNIFORM SPECTRUM
UNDISTORTED SIGNAL HAS ONLY ONE KOTELNIKOV’S COMPONENT

13. DISTORTION OF THE FOURTH CHANNEL

14. DISTORTION OF THE THIRD CHANNEL

15. DISTORTION OF THE SECOND CHANNEL

16. DISTORTION OF THE FIRST CHANNEL

17. COEFFICIENT OF DISTORTION
UNIFORM SPECTRUM