long wave planetary radar (lpr)
DESCRIPTION
Long wave planetary radar (LPR). Subsurface radar sounding of the Fobos ground. N.A.Armand , V.M.Smirnov , V.N.Marchuk , O.V.Yushkova , Institute of Radioengineering and Electronics of RAS, Moscow V.V.Abramov , A.S.Bazhanov 2 Special Design Bureau of IRE RUS, Fryazino , Russia. . - PowerPoint PPT PresentationTRANSCRIPT
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Long wave planetary radar(LPR)
Subsurface radar sounding of the Fobos ground
N.A.Armand, V.M.Smirnov, V.N.Marchuk, O.V.Yushkova, Institute of Radioengineering and Electronics of RAS,
Moscow
V.V.Abramov, A.S.Bazhanov2
Special Design Bureau of IRE RUS, Fryazino, Russia.
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The experiment purpose, expected results
Revealing of Phobos deep structure Estimation of in-situ rock density of
Phobos ground Research of a relief and roughness of
Phobos surface Estimation of dielectric properties of a
ground on different depths along a line of the spacecraft flight
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THE PHYSICAL SCHEME OF EXPERIMENT
SC
Reflection of surface
Phobosstructure
Reflection of subsurface
layers
Layer 1
Layer 2
Layer 3
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THE PHYSICAL SCHEME OF EXPERIMENT
Distance less then 1 km Distance higher then 1 km
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The scheme of carrying out of survey sounding of a Phobos surface
by the radar LPR in a quasisynchronous orbit
MarsPhobos
Phobos orbit
Spacecraft orbit
Height 50 – 100km. Mode 1: 1 measurement per 90 seconds, 8191 sub pulses in a code keying signal
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The scheme of survey sounding of a Phobos surface
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The scheme of survey sounding of a Phobos surface
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The scheme of carrying out of detailed sounding of a Phobos surface
by the radar LPR in a quasisynchronous orbit
L=vt
Spacecraft orbit
H=50 km
Phobos
surfa
ce
Height 50 – 60 km. Mode 2: 2 measurement per second, 2047 sub pulses in a code keying signal.
It is planed 6 sessions in 10 min durations.
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The scheme of detailed sounding of a Phobos surface in a quasisynchronous orbit
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The scheme of carrying out of sounding of a Phobos surface
by the radar LPR at spacecraft landing
Phobos surface
Mode 4
H=20 km
H=1 km
H=100 m
Mode 3
Height from 20 km to100 m. Two sessions duration for 10 minutes, on 2 measurements per second.
Mode 3 - 255 sub pulses in a signal. Mode 4 - a monoimpulse.
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The scheme of a Phobos surface sounding at spacecraft landing
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LPR outward appearance
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Device LPR technical characteristicsCarrier frequency 150 MHzFrequency range 15025 MHzSpectrum band 43 MHzAmplification factor 110 – 120 dBRadio-frequency pulse duration 26,6 nsThe number of sub pulses in phase code keying
signal8191, 2047,
255Height range 0 – 100 kmThe permission on a vertical on the Rayleigh 2 mNominal target pulse capacity of the transmitter 20 25 W
Input signal power 510 mWAverage power consumption 7 WAntenna length 1350 mmOverall weight 3.5 kg
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Main parameters of operating modes of the radar LPR
Operating mode
Height range,
km
The number of sub- pulses in a
signal
Signal duration, T
(μs)
Energy gain,dB
1 120 – 30 8191 220 39 (20)
2 60 – 10 2047 55 34 (17)
3 20 – 1 255 6.8 24 (12)
4 1.5– 0 1 26,710-3 0
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Probing signal of device LPR and its spectrum
• Spectra of a device DPR signal: by a green line the spectrum of an individual radio impulse, dark blue – code keying signal of 2047 sub pulses is shown
• .
N
S(N)
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Device LPR information capacity
Place of experimentOperating mode
Meassu-rement capacity, bytes
Operating time,
min
The number of meassu-rements
per session
The number of sessions
Operating mode
total capacity,
Mb
Quasi synchronous orbit
1 57024 180 120 4 26.1
Quasi synchronous orbit
2 16896 5 600 6 58.1
Landing (up tо 1 km)
3 4224 10 1200 1 4.8
Landing (lower 1 km)
4 2112 10 1200 1 2.4
Phobos surface 1,2,3,4 ≈20064 1*4 10 1*4 0.8
Total 92.1
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Modeling of a LPR signal restoration (М=2047) at a signal to noise ratio -15dB is shown
N
N
U(N)
U(N)
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Modeling of a LPR signal restoration (М=2047) at a signal to noise ratio -15dB is shown
N
N
U(N)
U(N)
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Thanks for attention