Difference between revisions of "Talk:Receiving LRO and LCROSS"

From MyLabWiki
Jump to: navigation, search
(2009-10-10)
(Logbook)
 
(3 intermediate revisions by the same user not shown)
Line 66: Line 66:
 
== Logbook ==
 
== Logbook ==
  
=== 2009-08-24 ===
+
=== 2009.08.24 ===
  
 
* Project kick-off
 
* Project kick-off
  
=== 2009-08-25 ===
+
=== 2009.08.25 ===
  
 
* Found some unofficial info about LRO and LCROSS transmitters and antennas
 
* Found some unofficial info about LRO and LCROSS transmitters and antennas
 
* Created preliminary link budget to the point of ''Signal strength at receiver antenna''.
 
* Created preliminary link budget to the point of ''Signal strength at receiver antenna''.
  
=== 2009-08-26 ===
+
=== 2009.08.26 ===
  
 
* Ordered LNA and Bias-T from [http://www.kuhne-electronic.de/ Kuhne Electronic]
 
* Ordered LNA and Bias-T from [http://www.kuhne-electronic.de/ Kuhne Electronic]
  
=== 2009-08-27 ===
+
=== 2009.08.27 ===
  
 
* Analytical assessment of the system noise temperature available: 65 K
 
* Analytical assessment of the system noise temperature available: 65 K
  
=== 2009-08-28 ===
+
=== 2009.08.28 ===
  
 
* LNA and Bias-T have arrived!
 
* LNA and Bias-T have arrived!
  
=== 2009-09-02 ===
+
=== 2009.09.02 ===
  
 
* Ordered cables and connectors from [http://www.wimo.de/ Wimo]
 
* Ordered cables and connectors from [http://www.wimo.de/ Wimo]
  
=== 2009-09-03 ===
+
=== 2009.09.03 ===
  
 
* Created a videoblog presenting the project and current status, see http://www.youtube.com/watch?v=7wIDIsu1zus
 
* Created a videoblog presenting the project and current status, see http://www.youtube.com/watch?v=7wIDIsu1zus
  
=== 2009-09-04 ===
+
=== 2009.09.04 ===
  
 
* Cables and connectors shipped from [http://www.wimo.de/ Wimo]
 
* Cables and connectors shipped from [http://www.wimo.de/ Wimo]
Line 101: Line 101:
 
* Managed to get some hardware for mounting the antenna on the photo tripod
 
* Managed to get some hardware for mounting the antenna on the photo tripod
  
=== 2009-09-05 ===
+
=== 2009.09.05 ===
  
 
* The antenna support plate I got was made of something that I can not drill in (steel?). Therefore, the antenna mount has been postponed to next weekend.
 
* The antenna support plate I got was made of something that I can not drill in (steel?). Therefore, the antenna mount has been postponed to next weekend.
  
=== 2009-09-08 ===
+
=== 2009.09.08 ===
  
 
* The cables and adaptors from Wimo have arrived
 
* The cables and adaptors from Wimo have arrived
  
=== 2009-09-12 ===
+
=== 2009.09.12 ===
  
 
* Assembled antenna and mounted it on camera tripod for mechanical tests. Will work all right
 
* Assembled antenna and mounted it on camera tripod for mechanical tests. Will work all right
  
=== 2009-09-14 ===
+
=== 2009.09.14 ===
  
 
* Decided to change the electric architecture to use batteries instead of bias-T
 
* Decided to change the electric architecture to use batteries instead of bias-T
Line 120: Line 120:
 
* Smoke test of LNA before taking it into lab: http://www.youtube.com/watch?v=Ov5_lsFi66w
 
* Smoke test of LNA before taking it into lab: http://www.youtube.com/watch?v=Ov5_lsFi66w
  
=== 2009-09-15 ===
+
=== 2009.09.15 ===
  
 
* Lab measurements on the receiver and LNA:
 
* Lab measurements on the receiver and LNA:
Line 132: Line 132:
 
* Complete report on the [http://forum.xprize.frednet.com/viewtopic.php?f=12&t=599&p=5376#p5371 TFN forum].
 
* Complete report on the [http://forum.xprize.frednet.com/viewtopic.php?f=12&t=599&p=5376#p5371 TFN forum].
  
=== 2009-09-19 ===
+
=== 2009.09.19 ===
  
 
* Video tour of the antenna available on YouTube: http://www.youtube.com/watch?v=1mx1_b96uK8
 
* Video tour of the antenna available on YouTube: http://www.youtube.com/watch?v=1mx1_b96uK8
  
=== 2009-09-26 ===
+
=== 2009.09.26 ===
  
 
There are some potential comm windows today, but the weather is teasing... It's overcast and raining from time to time. Not risking the receiver.
 
There are some potential comm windows today, but the weather is teasing... It's overcast and raining from time to time. Not risking the receiver.
Line 214: Line 214:
 
|}
 
|}
  
=== 2009-10-03 ===
+
=== 2009.10.03 ===
  
 
Perfect Moon passes but the weather was very bad this weekend. Raining most of the time. Tests cancelled until next weekend.
 
Perfect Moon passes but the weather was very bad this weekend. Raining most of the time. Tests cancelled until next weekend.
  
=== 2009-10-10 ===
+
=== 2009.10.10 ===
  
 
No signal from LRO today, even though I tried two near-side passes.
 
No signal from LRO today, even though I tried two near-side passes.
Line 226: Line 226:
 
[[Image:SolarNoise-22158M-20091010-111813.png|500px]]
 
[[Image:SolarNoise-22158M-20091010-111813.png|500px]]
  
=== 2009-10-11 ===
+
=== 2009.10.11 ===
  
 
No luck with LRO this morning either. Wondering if it is because the OPS team is taking a break after LCROSS crash, or no more support from Kiruna, or maybe the antenna is broken?  
 
No luck with LRO this morning either. Wondering if it is because the OPS team is taking a break after LCROSS crash, or no more support from Kiruna, or maybe the antenna is broken?  
Line 250: Line 250:
  
 
Interestingly, I did not see the energy signature from the Sun at 2.2158 GHz [[:Image:SolarNoise-22158M-20091010-111813.png|that I saw yesterday]]!
 
Interestingly, I did not see the energy signature from the Sun at 2.2158 GHz [[:Image:SolarNoise-22158M-20091010-111813.png|that I saw yesterday]]!
 +
 +
=== 2010.03.19 ===
 +
 +
* Dish got [http://twitpic.com/19kat1 badly damaged during the winter] :(
 +
 +
=== 2010.04.11 ===
 +
 +
* It appears that LRO ''is'' [http://twitter.com/UHF_Satcom/status/11985643628 transmitting while over Europe]!
 +
 +
=== 2010.10.26 ===
 +
 +
* UHF Satcom reports [http://twitter.com/uhf_satcom/statuses/28826451434 reception of LRO] ([http://pjm.dyndns.org/sdr/lro2271228.jpg see screenshot]) using a [http://twitter.com/uhf_satcom/statuses/28770631604 1m dish].
 +
* I would like to make some new attempts; however, the frontend of the DBSRX is damaged and gain is reduced by ~20dB
 +
* Thinking of purchasing an RFX2200...
 +
 +
[[Category:Logbooks]]

Latest revision as of 22:06, 26 October 2010

LRO Transponder Info

NASA Solicitation: Lunar Reconnaissance Orbiter Mission Communication System

Source: http://www.spaceref.com/news/viewsr.html?pid=16926

General Information

Solicitation Number: LRO-NASA-GSFC-06-07-05
Posted Date: Jun 09, 2005
FedBizOpps Posted Date: Jun 09, 2005
Original Response Date: N/A
Current Response Date: N/A
Classification Code: A – Research and Development
NAICS Code: 927110 – Space Research and Technology

Contracting Office Address

NASA/Goddard Space Flight Center, Code 210.S, Greenbelt, MD 20771

Description

LRO RF Communications Reference Baseline dated June 2, 2005

This document is intended to inform interested vendors of the current baseline architecture for the Lunar Reconnaissance Orbiter mission communication system. This document describes the current project understanding of LRO's mission communications as a result of the project's previous RFI process. This is not a request for additional RFI responses, nor is this a request for vendor proposals. No procurement action will be taken as a result of this document's release.

The LRO Project intends to initiate three separate competed procurement efforts to acquire the flight components for the LRO Spacecraft Communication System. These procurements will consist of the S-Band TT&C Transponder, the High-Rate Ka-Band Modulator, and the Ka-Band Traveling Wave Tube Amplifier (TWTA).

LRO shall provide tracking, telemetry and command functions using S-Band. LRO shall provide high rate mission data return at Ka-band. At a minimum, LRO will perform a 30 minute TT&C pass every lunar orbit (approximately every 2 hours). LRO will perform up to 4 high rate Ka-band downlinks in a 24 hour period. The high rate downlinks may be adjacent passes.

S-Band TT&C Subsystem

LRO's S-Band TT&C subsystem architecture consists of a STDN transponder and associated diplexer, switches and RF network to connect the transponder to the omnidirectional and high gain antennas. Command decryption (if required) can be accommodated internal to the transponder, or through the use of a standalone command decryptor in-line between the transponder receiver and the S-Band comm. card in the C&DH processor. The transponder shall provide the following modes:

Transponder Characteristics: Downlink data: RS-422 CLK and DATA Uplink data: RS-422 CLK and DATA Control/Status: RS-422 serial UART interface RF Output: S-Band 5W

Command Uplink (Ground to LRO) Frequency Band: 2.025 - 2.11 GHz Command Modulation: PCM/PSK/PM Command Subcarrier: 16 KHz Command Data Rate: 4 Kbps Command Link FEC: (none) Command Decryption: Caribou assumed Tracking: STDN tones, baseband modulated Simultaneous with CMD Highest ranging tone will be 500 KHz

Telemetry Downlink (Subcarrier Modulated Mode) (LRO to Ground) Frequency Band: 2.2 – 2.29 GHz Telemetry Modulation: PCM/PSK/PM Telemetry Subcarrier: 1.024 MHz Telemetry Data Rates: 16Kbps (36.64 K-symbols/sec) 32Kbps (73.28 K-symbols/sec) 64Kbps (146.56 K-symbols/sec) 128Kbps (293.12 K-symbols/sec) Downlink FEC: CCSDS Reed-Solomon & Convolutional Rate ½ Downlink Encryption: (none) Tracking: STDN tones, baseband modulated Simultaneous with TLM Highest ranging tone will be 500 KHz

Telemetry Downlink (Direct Modulated Mode) (LRO to Ground) Frequency Band: 2.2 – 2.29 GHz Telemetry Modulation: OQPSK (direct carrier) Telemetry Subcarrier: (none) Telemetry Data Rates: 300Kbps (687 K-symbols/sec) 2180Kbps (4992.2 K-symbols/sec) 5000Kbps (no FEC) Downlink FEC: CCSDS Reed-Solomon & Rate ½ (2.29x multiplier) Downlink Encryption: (none) Tracking: (none)

Ka-Band Mission Data Subsystem

LRO's Ka-band subsystem consists of a high rate Ka-band modulator, TWTA, EPC, and the RF network between the TWTA and LRO's high gain antenna.

Modulator Characteristics: Downlink Data: LVDS CLK and DATA Control/Status: RS-422 serial UART interface RF Output: +7 dBm (at the modulator output port)

TWTA/EPC Characteristics: Control/Status: Discrete RF Output: Ka-Band 20W (+13 dBW) RF Input: >0 dBm (at the TWT input port)

High Rate Data Downlink (LRO to Ground) Frequency Band: 25.5 – 27.0 GHz Telemetry Modulation: OQPSK (direct carrier) Telemetry Subcarrier: (none) Telemetry Data Rates: 25Mbps (57.25 M-symbols/sec) 50Mbps (114.5 M-symbols/sec) 100Mbps (229 M-symbols/sec) Downlink FEC: CCSDS Reed-Solomon & Rate ½ (2.29x multiplier) Downlink Encryption: (none) Tracking: (none)

Point of Contact

Name: Jason A Soloff
Title: Communication Systems Engineer
Phone: (301) 286-1368
Fax: (301) 286-1750

Name: Julie A. Janus
Title: Contracting Officer
Phone: (301) 286-4931
Fax: (301) 286-0341


Logbook

2009.08.24

  • Project kick-off

2009.08.25

  • Found some unofficial info about LRO and LCROSS transmitters and antennas
  • Created preliminary link budget to the point of Signal strength at receiver antenna.

2009.08.26

2009.08.27

  • Analytical assessment of the system noise temperature available: 65 K

2009.08.28

  • LNA and Bias-T have arrived!

2009.09.02

  • Ordered cables and connectors from Wimo

2009.09.03

2009.09.04

  • Cables and connectors shipped from Wimo
  • The project was one Evadot today: It’s inspiration Friday...
  • Managed to get some hardware for mounting the antenna on the photo tripod

2009.09.05

  • The antenna support plate I got was made of something that I can not drill in (steel?). Therefore, the antenna mount has been postponed to next weekend.

2009.09.08

  • The cables and adaptors from Wimo have arrived

2009.09.12

  • Assembled antenna and mounted it on camera tripod for mechanical tests. Will work all right

2009.09.14

  • Decided to change the electric architecture to use batteries instead of bias-T
    • 6V 10-12 Ah rechargeable lead battery for USRP (USRP draws 1.6 A with 2 daughter boards)
    • 9V 280 mAh rechargeable Ni-MH for LNA (LNA is specified to draw 80 mA)
  • Smoke test of LNA before taking it into lab: http://www.youtube.com/watch?v=Ov5_lsFi66w

2009.09.15

  • Lab measurements on the receiver and LNA:
    • LNA gain and noise figure confirmed in the range 2.2 - 2.3 GHz
    • LNA does not have bandpass filter
    • LNA gain stays > 28 dB down to 700 MHz and up to 2.45 GHz
    • LNA NF @ 1.5 GHz ~ 1 dB
    • USRP+DBSRX can detect -132 dBm CW signal @ 2.25 GHz (FFT avg. α = 0.07)
    • USRP+DBSRX+LNA can detect -138 dBm CW signal @ 2.25 GHz (FFT avg. α = 0.07)
    • USRP+TVRX could go down to about -120 dBm FM @ 435 MHz
  • Complete report on the TFN forum.

2009.09.19

2009.09.26

There are some potential comm windows today, but the weather is teasing... It's overcast and raining from time to time. Not risking the receiver.

Time (UTC) Moon RA/DEC (J2000) Moon Az/Alt Event Notes
14:10:00 LRO AOS Lon/Lat: -87° / -70.4°
14:19:30 18h36m38.5s / -25° 42'27.1" +131° 14'00" / +0° 0'00" Moonrise
time
15:00:00 LRO LOS -78.5&deg / 85.9°
15:57:56 18h39m24.7s / -25° 39'47.1" +150° 27'51" / +10° 0'01" Sun Az/Alt: +248° 54'15" / +15° 35'18"
17:34:58 18h41m53.5s / -25° 34'38.1" +171° 42'09" / +15° 8'59" Sunset Sun Az/Alt: +267° 43'16" / -0° 0'02"
16:05:00 LRO AOS -87.9° / -68.2°
16:55:00 LRO LOS
18:13:36 18h42m50.9s / -25° 31'47.6 +180° 31'36" / +15° 37'07" Moon @ max Alt
time
22:07:18 18h49m1.8s / -25° 5'29.6" +229° 53'10" / +0° 0'02" Moonset

2009.10.03

Perfect Moon passes but the weather was very bad this weekend. Raining most of the time. Tests cancelled until next weekend.

2009.10.10

No signal from LRO today, even though I tried two near-side passes.

Mysterious energy signature from the direction of the Sun:

SolarNoise-22158M-20091010-111813.png

2009.10.11

No luck with LRO this morning either. Wondering if it is because the OPS team is taking a break after LCROSS crash, or no more support from Kiruna, or maybe the antenna is broken?

We try again in two weeks time.

Detected some interesting mystery signals, though. First, something that appears to be a spacecraft that coincidentally passed through the antenna FOV. The antenna was pointing towards Az/El (270°,40°):

MysterySignal-20091011 111822.png MysterySignal-20091011 111851.png
The signal at 11:18:22 CET The signal at 11:18:51 CET

The second signal was coming from the direction of the village. Wondering if it is some spurious WiFi signal.

MysterySignal-20091011 112107.png MysterySignal-20091011 113247.png

Interestingly, I did not see the energy signature from the Sun at 2.2158 GHz that I saw yesterday!

2010.03.19

2010.04.11

2010.10.26

  • UHF Satcom reports reception of LRO (see screenshot) using a 1m dish.
  • I would like to make some new attempts; however, the frontend of the DBSRX is damaged and gain is reduced by ~20dB
  • Thinking of purchasing an RFX2200...