РСДБ-сессия LFVN в 2008 году

[Игорь]

Понятно, Интернета не было:

Здравствуй, Игорь!

Отчет по второму дню.
Новости опять хорошие. Евпатория отработала без сбоев и без перерывов.
Мощность сигнала по большинству спутников была 25 кВт, в сканах 95069_2, 
90114_2, 95029_3 - 30 кВт.

Т.к. интернет отрубился совсем, связь с Вентспилсом была по телефону.
Сообщили, что визуально на самописце сигнал наблюдали в сканах 95071_1, 
90097_2, 95085_2. В результате обработки отклик получен в сканах 90031_1, 
95031_1, 95069_2, 90022_1. Обработка остальных сканов ведется.

Пока,
Маша

Dear Liu Xiang, HuaZhang, Wenjun Yang, Gino, Giuseppe, Emma and Stelio,

Evpatoria worked today in normal mode.
Power of transmitter in most of scans is 25 kW, except scans: 95069_2, 
90114_2, 95029_3 - 30 kW.

Ventspils reported, that strong echo was detected during scans 95071_1, 
90097_2, 95085_2. Also the echo was obtained in result of autocorrelation 
in scans 90031_1, 95031_1, 95069_2, 90022_1.
  Please, inform us if Urumqi obtained echo.

Best regards,
Maria

[Игорь]

Краткие, но от этого не менее долгожданные, вести из Симеиза 

Добрый день,

В Симеизе все ок.

Удачи,
А.Вольвач

[Игорь]

Есть первые два эхо-сигнала, детектированные в Ното.

Dear Maria and colleagues,

here the first spectrum in Noto NT_247-164010_1

You can see a good peak in agreament with the
expected frequency.

I'll let you know more about the other points
I was asked to check by Igor.

I'll consider only the day 247.

Cheers,
Gino

Dear Igor,

so it seems as the first echo

> In first turn please check 16:40:10 - please see strong echo from Ventspils for this time (from
> former satellite 95069).

is well detected,
>
> Also please check othet times with some integration of signals:
>
> - 12:05   95029

it's weak but visible at the expected frequency (attached now),

while the others
> - 12:50   90114
> - 13:35   90097
> - 14:20   43091
> - 15:05   95022
> - 15:50   90008

are not visible with 45s integration time.

Cheers,
Gino

[Игорь]

Увы, второй день наблюдений в Ното - неудачный. В автоматическую программу управления
РСДБ-аппаратурой (шкедуле)  вкралась ошибка.

Dear Maria,

There is anyway sometime an error affecting the pointing
due to mistakes in the schedule. It was reported for istance
the string

source=95085-0654,60957512.230,+065615.19,2000.0

that in RA has eight characters. The FS produces errors
and it's not changing the pointing. All the source with such
error are not observed. So take care of this problem in producing
the new schedules.

I'll let you know something more on the other results later.

Cheers,
Gino

[Игорь]

Dear Maria and Igor,
only a weak echo was detected (from 95071_1) by Medicina, so far.
It is very strange, since in the VLBR07.1 (November 2007) very strong
echoes were observed by the same system setup utilized in this session and
from same of the objects included also in this last run (95071 and 95031).
Yesterday, before the observations, we checked also the antenna pointing
and all the system setup (C band receiver, spectrometers, etc.) by
observing some standard radiosources. The system status was OK.

A possibility is that ephemerids for Medicina could be not correct, i.e.
due to wrong Medicina antenna coordinates utilized in your calculation or
for other reasons.

Could you please check the space-debris ephemerids calculation for
Medicina?

In any case our antenna geodetic coordinates are the following:

LAT = 44 deg 31' 13.77" North
LON = 11 deg 38' 49.95" East
Height = 67.19 m

We look forward to receive important feedback from you.

Thank you and best regards,

Giuseppe, Emma and Stelio

[Игорь]

Вести из Урумчи:

HI,

ZHANG HUA told me echo was received, 
cheers Liu

[Игорь]

Время создания:      Sun, 07 Sep 2008 17:57:08 +0400
Тема:                цу

Володя, Игорь!

Мне через 45 минут выезжать на телескоп. Срочно жду координаты.

Маша

[Игорь]

Время создания:      Sun, 07 Sep 2008 17:58:19 +0400
Тема:                эфемериды по спутникам на 07.09

Уважаемые коллеги,

высылаю эфемериды по спутникам на 7-8 сентября.

Владимир Титенко


Dear colleagues,

please find in attachment the ephemerides for space debris location,
September 7-8.

Vladimir Titenko

[Игорь]

Здравствуй, Володя!

Высылаю видео-частоты на сегодня.
Мы начинаем работу. Интернет опять не работает, буду стараться выходить с 
сотового в почту во время наблюдений. Телефон у нас в комнате пока не 
работает. Привет Александру Федоровичу.

Удачи,
Маша

[Игорь]

Анализ спектров за 2-й день эксперимента, присланных из Вентспилса:

Dear Igor,

1. The strong clear echo on expected frequency is in the next scans:

05 Sep  204510  95071   5009.78 245.518  (image002.jpg)
05 Sep  234810  95069   5009.78 251.719 (image008.jpg)

2. There is clear signal on expected frequency in scan
05 Sep  230500  95031   5009.78 246.052  (image004)

3. The second peak in scan
06 Sep  025200  95074   5009.78 237.141 (image012)
corresponds the calculated frequency

Maria

[Игорь]

4. The central peak in scan
06 Sep  004017  90022   5009.78 245.913 (image010.jpg)
is echo, probably, but it is doubtful, because it's very small.

[Игорь]

Dear Igor and Maria,
a strong echo from 95071 was detected at Medicina.

> Are you able to send short part of recording data to Ventspils
> for analysis?

Yes, of course. After the end of this run we'll extract the selected data
of the second run from MK-V disk unit and we'll send them to Ventspils.

Regards,
Giuseppe, Emma and Stelio

[Игорь]

Dear Giuseppe,

Thank you for good news. Ventspils informed us, that echo from object 
90032 was obtained also.

Maria

[Игорь]

Здравствуй, Игорь,

Сегодня Евпатория отработала без сбоев, не считая опоздания на первую 
активную звезду SS433. По объектам 90031 и 95031 выдавалась мощность 30 
кВт, по остальным - 25 кВт.

Из Медичины сообщили в начале сеанса, что получено сильное эхо от 95071.
В Вентспилсе получены отраженные сигналы (видны на самописце) в сканах 
95071_2,90032_2, 95031_2, 95069_3, 95029_4, 90114_3, 90097_3, 95085_3. 
Остальные сейчас обрабатываются.

Маша

Dear colleagues,

Evpatoria worked in normal mode.
Power of emitted signal was 25 -30 kW.
Ventspils detected echo from most of objects (95071_2,90032_2, 95031_2, 
95069_3, 95029_4, 90114_3, 90097_3, 95085_3).

Medicina informed us at beginning of  observations, that strong signal has 
obtained from object 95071_2.

Please, inform us, if you have received the echo.

Best regards,
Maria

[Игорь]

Dear colleagues,
unfortunately last night at the Medicina antenna a power failure occured
at 21:00:48 UT. From then on the antenna has been stucked.
Therefore the last useful recorded object was 95071_2 (for the only first
fifteen minutes, when we detected the strong echo).
The antenna is now working and ready to start the new observational runs.
We apologize and wait for new coordinates.

Best regards,
Giuseppe, Emma and Stelio