JPH0239732A - Pilot signal automatic monitoring/control system - Google Patents

Pilot signal automatic monitoring/control system

Info

Publication number
JPH0239732A
JPH0239732A JP19135388A JP19135388A JPH0239732A JP H0239732 A JPH0239732 A JP H0239732A JP 19135388 A JP19135388 A JP 19135388A JP 19135388 A JP19135388 A JP 19135388A JP H0239732 A JPH0239732 A JP H0239732A
Authority
JP
Japan
Prior art keywords
pilot signal
station
pilot
stations
control system
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP19135388A
Other languages
Japanese (ja)
Inventor
Koji Shigeta
繁田 公二
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP19135388A priority Critical patent/JPH0239732A/en
Publication of JPH0239732A publication Critical patent/JPH0239732A/en
Pending legal-status Critical Current

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  • Radio Relay Systems (AREA)

Abstract

PURPOSE:To reduce the number of the stations necessary for the network of a pilot signal automatic monitoring/control system by sending a reference pilot signal alternately with the same frequency with two stations. CONSTITUTION:A reference station intermittently sends a reference pilot signal 6 with a timing of the self-station to a free-run. Next, a back-up station receives the pilot signal 6 from the reference station, sets a self-station pilot sending timing from the timing and sends intermittently a pilot signal 7 to the middle of the pilot signal 6 from a reference station. At the monitoring station, the time when the pilot signal of two stations is intermittently inputted to a receiver at the level in the standard always is normal and it is judged that when only one wave out of two stations is inputted, an abnormality occurs at the pilot transmitting station not inputted and the transmitting system to the satellite.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 この発明はSCPC回線にてパイロット信号を必要とす
る小容量の衛星通信システムに関するものである。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a small-capacity satellite communication system that requires a pilot signal in an SCPC line.

〔従来の技術〕[Conventional technology]

第3図は従来の衛星通信システムのネットワーク構成を
示す説明図である。図において、(1)は衛星、(2)
は各局で周波数誤差を補正する(AFC/AGC回路に
て行なう)為のパイロット信号(以下基準パイロット信
号と呼ぶ)を送出する基準パイロット送出局、(3)は
基準パイロット信号が断となった場合に基準パイロット
信号を送出する基準パイロットバックアップ局、(4)
は基準パイロット信号の監視を目的とした基準パイロッ
トとは周波数のことなった第2パイロツト信号(以下監
視パイロット信号と呼ぶ)を送出する監視パイロット送
出局、(5)は監視パイロット信号が断となった場合に
監視パイロット信号を送出する監視パイロットバックア
ップ局である。
FIG. 3 is an explanatory diagram showing the network configuration of a conventional satellite communication system. In the figure, (1) is a satellite, (2)
(3) is a reference pilot sending station that sends out a pilot signal (hereinafter referred to as a reference pilot signal) for correcting frequency errors (performed by the AFC/AGC circuit) at each station; (3) is a case where the reference pilot signal is disconnected; (4) a reference pilot backup station that sends a reference pilot signal to
(5) is a monitoring pilot transmitting station that sends out a second pilot signal (hereinafter referred to as a monitoring pilot signal) that has a different frequency from the reference pilot signal for the purpose of monitoring the reference pilot signal; This is a supervisory pilot backup station that sends a supervisory pilot signal in the event of an emergency.

また、第4図は上記各局の構成ブロック図を示す。Qυ
は変調器、(6)はIF合成器、(13はパイロット信
号0N10FF回路、α弔はパイロット信号発生器、Q
5はアップコンバータ、aQはダウンコンバータ、α力
は基準パイロット信号にてループを構成するAFC/A
GC回路、(ト)は監視パイロット信号を監視するパイ
ロット信号検出回路、四はパイロット信号の受信入力状
態にて送信側にパイロット信号を送出するか否か判定す
るパイロット信号送出判定回路、四は復調器である。
Further, FIG. 4 shows a block diagram of the configuration of each of the above stations. Qυ
is a modulator, (6) is an IF combiner, (13 is a pilot signal 0N10FF circuit, α is a pilot signal generator, and Q
5 is an up converter, aQ is a down converter, and α power is an AFC/A that forms a loop with a reference pilot signal.
GC circuit, (g) is a pilot signal detection circuit that monitors the monitoring pilot signal, 4 is a pilot signal sending determination circuit that determines whether to send a pilot signal to the transmitting side based on the reception input state of the pilot signal, and 4 is a demodulation circuit. It is a vessel.

通常、基準パイロット送出局(2)から送出される基準
パイロット信号および監視パイロット送出局(4)から
送出される監視パイロット信号が送出されており前記の
各4局は各パイロット信号を監視する。ここで基準パイ
ロット信号は各局でAFC/AGC回路を使って周波数
誤差を補正する為に用いられる。監視パイロット信号は
各パイロット送出局(2)(4)からのパイロット信号
が断になったことを検出し、バックアップ局(3バ5ン
が送出局<2) (4)に代わってパイロット信号を送
出できるように回線状態を監視する為に用いられる。こ
の回線状態は監視局において、常時パイロット信号が2
波受信機に入力されている時を正常とし、2波のうちい
づれか1波じ壽入力されない時は、その入力されないパ
イロット送出局及び衛星(1)までの送信系に異常が発
生したと判断する。又、2波とも受信されない時は衛a
(1)から自局までの受信系及び自局の受信機に異常が
発生したと判断する。以上のことがら送出局の場合は両
パイロット信号を監視し、自局パイロット信号のみ1秒
以上断になった時送信を停止する。他の場合については
常時送信する。次に、バックアップ局については両パイ
ロット信号を監視し、自局が担当するパイロット信号の
み3秒以上断になった時パイロット信号を送信する。同
時にそのパイロット信号の送出局となる。他の場合につ
いては送信しない。これにより従来方式ではこれらの交
代に要する時間を考慮してパイロット信号が断になって
も受信系のAFC/AGC回路のループ保持時間を交代
に要する時間より少し長い4秒に設定する事で基準パイ
ロット信号の1秒以内の瞬停については伝送エラーなく
、又基準パイロット信号が切替っても回線断となる時間
が短くなるよう考慮されている。
Normally, a reference pilot signal sent from a reference pilot sending station (2) and a monitoring pilot signal sent from a monitoring pilot sending station (4) are sent out, and each of the four stations monitors each pilot signal. Here, the reference pilot signal is used to correct frequency errors using AFC/AGC circuits at each station. The monitoring pilot signal detects that the pilot signal from each pilot sending station (2) (4) is disconnected, and sends a pilot signal in place of the backup station (3-band 5 is sending station < 2) (4). It is used to monitor the line status so that it can be transmitted. This line condition is determined by the monitoring station where the pilot signal is always 2.
It is considered normal when a wave is input to the receiver, and if one of the two waves is not input for a period of time, it is determined that an abnormality has occurred in the transmission system up to the pilot transmitting station and satellite (1) where the wave is not input. . Also, if both waves are not received,
It is determined that an abnormality has occurred in the receiving system from (1) to the own station and the receiver of the own station. Based on the above, the transmitting station monitors both pilot signals and stops transmitting when only its own pilot signal is disconnected for 1 second or more. In other cases, it is always transmitted. Next, the backup station monitors both pilot signals and transmits a pilot signal when only the pilot signal that its own station is in charge of is disconnected for 3 seconds or more. At the same time, it becomes the transmitting station for the pilot signal. Do not send in other cases. As a result, in the conventional system, in consideration of the time required for these changes, even if the pilot signal is disconnected, the loop holding time of the AFC/AGC circuit in the receiving system is set to 4 seconds, which is slightly longer than the time required for the changes. It is considered that there will be no transmission error in case of instantaneous interruption of the pilot signal for less than 1 second, and that even if the reference pilot signal is switched, the time during which the line will be disconnected will be shortened.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

従来の衛星通信システムは以上のように構成されていた
ので、4局にて2波のパイロット信号を監視及び制御し
なければならず、ネットワークを構築するのに必要な局
数も多く、ハードウェアも複雑であるという問題点があ
った。
Conventional satellite communication systems were configured as described above, so four stations had to monitor and control two waves of pilot signals, and the number of stations required to construct a network was large, and the hardware The problem was that it was also complicated.

この発明は上記のような問題点を解消するためになされ
たもので、ネットワークを構築するのに必要な局数も2
局でできるとともに、ハードウェアも従来より小型化で
きるパイロット信号自動監視/制御システムを得ること
を目的とする。
This invention was made to solve the above problems, and the number of stations required to construct a network is 2.
The purpose of this invention is to provide an automatic pilot signal monitoring/control system that can be used at a station and also has smaller hardware than before.

〔課題を解決するための手段〕[Means to solve the problem]

この発明のパイロット信号自動監視/制御システムは監
視パイロット信号の送出を不要とし、基準パイロット信
号を2つの局が交互に同一周波数にて送出するようにし
たものである。
The automatic pilot signal monitoring/control system of the present invention eliminates the need to send out a monitoring pilot signal, and allows two stations to alternately send out reference pilot signals at the same frequency.

〔作用〕[Effect]

この発明における基準パイロット信号は同一周波数にて
2局から交互に送出され、これを受信、検出することに
より各局の送出状態を監視し、従来と同等の機能を実現
する。
The reference pilot signal in this invention is alternately sent out from two stations at the same frequency, and by receiving and detecting this, the sending status of each station is monitored, and the same function as the conventional one is realized.

〔実施例〕〔Example〕

以下、この発明の一実施例を図について説明する。第1
図において、0υは変調器、CI功はIF合成器、0は
パイロット信号0N10FF回路、0弔はパイロット信
号発生器、αQはアップコンバータ、四はダウンコンバ
ータ、σ力は基準パイロットにてループを構成するAF
C/AGC回路、(4)は復調器である。
An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, 0υ is a modulator, CI is an IF combiner, 0 is a pilot signal 0N10FF circuit, 0 is a pilot signal generator, αQ is an up converter, 4 is a down converter, and σ is a reference pilot to form a loop. AF
C/AGC circuit (4) is a demodulator.

終 第2図はこの発明の各局のタイミングを時径列的に示し
たブロック図で、まず、基準局はフリーランに自局のタ
イミングにて基準パイロット信号(6)を間欠に送出す
る。次にバックアップ局は基準局からのパイロット信号
(6)と受信し、そのタイミングより自局パイロット送
出タイミングを設定し、基準局からのパイロット信号(
6)の中間に間欠にパイロット信号(7)を送出するよ
うになっている。
Finally, FIG. 2 is a block diagram showing the timing of each station according to the present invention in chronological order. First, the reference station intermittently sends out the reference pilot signal (6) in free run at its own timing. Next, the backup station receives the pilot signal (6) from the reference station, sets its own pilot transmission timing based on that timing, and sends the pilot signal (6) from the reference station.
A pilot signal (7) is sent out intermittently in the middle of step 6).

されている時を正常とし、2局のうちいづれか1波しか
人力されない時はその入力されないパイロット送信局及
び衛星までの送信系に異常が発生したと判断する。又、
2波とも受信されない時は衛星から自局までの受信系及
び自局の受信機に異常が発生したと判断する。以上のこ
とから、基準局る。これによりいづれか一方の局が送信
停止しても他局のパイロット信号にてAFC/AGCル
ープをクローズすることができる。
It is considered normal when the signal is input, and when only one wave is manually input from one of the two stations, it is determined that an abnormality has occurred in the transmission system from the pilot transmitting station to the satellite where no input is received. or,
When both waves are not received, it is determined that an abnormality has occurred in the receiving system from the satellite to the own station and in the receiver of the own station. Based on the above, the reference station is established. As a result, even if one of the stations stops transmitting, the AFC/AGC loop can be closed using the pilot signal of the other station.

〔発明の効果〕〔Effect of the invention〕

以上のようにこの発明によれば、従来常時2波送出して
いたパイロット信号を1波に減らすことで従来と同一機
能を達成が可能で、パイロット信号自動監視/制御シス
テムのネットワークに必要な局数が低減できると共に機
器の小型化が可能となる。
As described above, according to the present invention, it is possible to achieve the same function as before by reducing the pilot signal, which was conventionally always sent out with two waves, to one wave, and it is possible to achieve the same function as before, and it is possible to realize The number can be reduced, and the equipment can be made smaller.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図はこの発明の一実施例による衛星通信シック図、
第3図は従来の衛星通信システムのネットワーク構成を
示す説明図、第4図は従来の各局の構成ブロック図であ
る。 図において、(6)は基準局パイロットキャリア、(7
)はバックアップ局パイロットキャリア、qpは変調器
、□□□はIF合成器、(至)はパイロット信号0VO
FF回路、a復はパイロット信号発生器、Q5はアップ
コンバータ、OQはダウンコンバータ、αηはAFC/
AFG回路、(1)は復調器を示す。 なお、図中、同一符号は同一、又は相当部分を示す。
FIG. 1 is a satellite communication chic diagram according to an embodiment of the present invention.
FIG. 3 is an explanatory diagram showing the network configuration of a conventional satellite communication system, and FIG. 4 is a block diagram of the configuration of each conventional station. In the figure, (6) is the reference station pilot carrier, (7
) is the backup station pilot carrier, qp is the modulator, □□□ is the IF combiner, (to) is the pilot signal 0VO
FF circuit, aback is pilot signal generator, Q5 is up converter, OQ is down converter, αη is AFC/
AFG circuit (1) shows a demodulator. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

【特許請求の範囲】[Claims] 伝送上で生じる基準周波数からの周波数誤差を補正する
為に用いられるパイロット信号と、そのパイロット信号
が断となった時自動的にバックアップ局がパイロット信
号を送出する目的により送信するパイロット信号の2波
が常時出力されているSCPC回線において、周波数補
正用のパイロット信号を交互に出力し、その受信レベル
を検出することによって回線の状態を監視しバックアッ
プが行なえる様にしたことを特徴とするパイロット信号
自動監視/制御システム。
Two waves: a pilot signal used to correct frequency errors from the reference frequency that occur during transmission, and a pilot signal transmitted by the backup station for the purpose of automatically transmitting a pilot signal when the pilot signal is disconnected. A pilot signal that is characterized in that in an SCPC line where is constantly output, a pilot signal for frequency correction is alternately outputted, and by detecting the reception level of the pilot signal, the status of the line can be monitored and backup can be performed. Automatic monitoring/control system.
JP19135388A 1988-07-29 1988-07-29 Pilot signal automatic monitoring/control system Pending JPH0239732A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP19135388A JPH0239732A (en) 1988-07-29 1988-07-29 Pilot signal automatic monitoring/control system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19135388A JPH0239732A (en) 1988-07-29 1988-07-29 Pilot signal automatic monitoring/control system

Publications (1)

Publication Number Publication Date
JPH0239732A true JPH0239732A (en) 1990-02-08

Family

ID=16273165

Family Applications (1)

Application Number Title Priority Date Filing Date
JP19135388A Pending JPH0239732A (en) 1988-07-29 1988-07-29 Pilot signal automatic monitoring/control system

Country Status (1)

Country Link
JP (1) JPH0239732A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05126933A (en) * 1991-10-31 1993-05-25 Nec Corp Display device for air traffic control system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05126933A (en) * 1991-10-31 1993-05-25 Nec Corp Display device for air traffic control system

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