JPH01278132A - Transmitter-receiver for satellite communication - Google Patents

Transmitter-receiver for satellite communication

Info

Publication number
JPH01278132A
JPH01278132A JP10790688A JP10790688A JPH01278132A JP H01278132 A JPH01278132 A JP H01278132A JP 10790688 A JP10790688 A JP 10790688A JP 10790688 A JP10790688 A JP 10790688A JP H01278132 A JPH01278132 A JP H01278132A
Authority
JP
Japan
Prior art keywords
frequency
mixer
local oscillator
transmitting
transmission
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
JP10790688A
Other languages
Japanese (ja)
Inventor
Isao Yuri
功 百合
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.)
NEC Corp
Original Assignee
NEC 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 NEC Corp filed Critical NEC Corp
Priority to JP10790688A priority Critical patent/JPH01278132A/en
Publication of JPH01278132A publication Critical patent/JPH01278132A/en
Pending legal-status Critical Current

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  • Transceivers (AREA)
  • Radio Relay Systems (AREA)

Abstract

PURPOSE:To omit a local oscillator of an intra-office return system by using the frequencies of the local oscillators of both transmission and reception systems to mix the frequencies via 1st and 2nd mixers and at the same time selecting the frequencies through a band pass filter(BPF) of obtain the reception frequency from the transmission frequency. CONSTITUTION:The output of a local oscillator 1 of a transmission system is partly taken out and mixed with the transmission frequency by a 1st mixer 5. Then only the desired signal component is taken out through a BPF 8. Furthermore an obtained intermediate frequency is mixed with the partial output of a local oscillator 2 of a reception system by a 2nd mixer 6. Then only the desired signal component is taken out by a BPF 9. In such a way, the reception frequency is obtained from the transmission frequency by means of the frequencies of both oscillators 1 and 2. Thus it is possible to omit the local oscillator of an intra-office return system.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は衛星通信用地球局に用いられる送受信装置に関
し、特に局内折り返し試験回路を必要とする送受信装置
に関する。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a transmitting/receiving device used in an earth station for satellite communications, and particularly to a transmitting/receiving device that requires an intra-station loopback test circuit.

〔従来の技術〕[Conventional technology]

従来、この種の送受信装置は中間周波数(以下IF周波
数と略す)から送信無線周波数(以下TXRF周波数と
略す)に周波数変換するためのローカル発振器、受信無
線周波数(以下RXRF周波数と略す)からIF周波数
に周波数変換するためのローカル発振器、及び局内折り
返し試験回路においてTXRF周波数からRXRF周波
数に周波数変換するためのローカル発振器の3つのロー
カル発振器をそれぞれ独立して備えている。
Conventionally, this type of transmitting/receiving device uses a local oscillator for frequency conversion from an intermediate frequency (hereinafter abbreviated as IF frequency) to a transmitting radio frequency (hereinafter abbreviated as TXRF frequency), and a local oscillator for converting the frequency from a receiving radio frequency (hereinafter abbreviated as RXRF frequency) to an IF frequency. It is equipped with three local oscillators, one for converting the frequency from the TXRF frequency to the RXRF frequency in the local loopback test circuit.

例えば、第2図は従来の局内折り返し試験回路を含む送
受信装置の一例を示す構成図である。この図において、
送信系においてはIF周波数はローカル発振器1の出力
とミキサー3で混合され、バンドパスフィルタ7で希望
の周波数成分だけを取り出し、送信系電力増幅部11で
増幅してアンテナから出力させている。
For example, FIG. 2 is a configuration diagram showing an example of a transmitting/receiving device including a conventional intra-station loopback test circuit. In this diagram,
In the transmission system, the IF frequency is mixed with the output of the local oscillator 1 by a mixer 3, and only a desired frequency component is extracted by a bandpass filter 7, amplified by a transmission system power amplifier 11, and output from the antenna.

ここで、IF周波数をIF、 ローカル発振器1の周波
数をPLO+ バンドパスフィルタフの中心周波数をF
とすると、 F=IF+FLO・・・(1) の関係式が得られる。
Here, the IF frequency is IF, the frequency of local oscillator 1 is PLO+ the center frequency of the bandpass filter is F
Then, the following relational expression is obtained: F=IF+FLO...(1).

また、受信系においては、アンテナから入力されて受信
系電力増幅部12で増幅されたRXRF周波数はローカ
ル発振器2の出力とミキサー4で混合され、バンドパス
フィルタ10で希望のIF周波数だけを取り出している
In the receiving system, the RXRF frequency input from the antenna and amplified by the receiving system power amplifier 12 is mixed with the output of the local oscillator 2 by the mixer 4, and only the desired IF frequency is extracted by the bandpass filter 10. There is.

ここで、RXRF周波数をf、ローカル発振器2の周波
数をfLO+ バンドパスフィルタ10の中心周波数を
IFとすると、 f = I F+ fLo    ”’ (2)の関係
式が得られる。
Here, if the RXRF frequency is f, the frequency of the local oscillator 2 is fLO+, and the center frequency of the bandpass filter 10 is IF, then the relational expression f=IF+fLo'' (2) is obtained.

更に、局内折返し系ではTXRF周波数はローカル発振
器15の出力とミキサー13で混合され、バンドパスフ
ィルタ14でRXRF周波数だけを取り出している。
Further, in the local loopback system, the TXRF frequency is mixed with the output of the local oscillator 15 in the mixer 13, and only the RXRF frequency is extracted in the bandpass filter 14.

ココテ、TXRF周波数をF、RXRF周波数をf、ロ
ーカル発振器15の周波数をFftoとすると、 FfLo=F  f    ・・・(3)の関係式が得
られる。
Here, when the TXRF frequency is F, the RXRF frequency is f, and the frequency of the local oscillator 15 is Ffto, the relational expression FfLo=F f (3) is obtained.

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

上述した従来の送受信装置では、送信系、受信系及び局
内折返し系にそれぞれ独立してローカル発振器1.2.
及び15が必要とされるため、各ローカル発振器の発振
周波数の調整が面倒になるとともに、送受信装置の構造
が複雑になり、しかも高価になるという問題がある。
In the conventional transmitting/receiving device described above, the local oscillators 1, 2, .
and 15 are required, which poses problems in that it becomes troublesome to adjust the oscillation frequency of each local oscillator, and that the structure of the transmitter/receiver becomes complicated and expensive.

本発明は、ローカル発振器の数を低減して装置を簡略化
しかつ低価格に構成できる衛星通信用送受信装置を提供
することを目的としている。
SUMMARY OF THE INVENTION An object of the present invention is to provide a transmitting/receiving device for satellite communication that can be simplified and inexpensively constructed by reducing the number of local oscillators.

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

本発明の衛星通信用送受信装置は、送信系、受信系、及
び局内折返し系とで構成される衛星通信用送受信装置に
おいて、局内折返し系に、送信系のローカル発振器の周
波数と送信周波数を混合する第1のミキサーと、この混
合により得られた周波数から所要の周波数を選択するバ
ンドパスフィルタと、受信系のローカル発振器の周波数
とこの選択された周波数を混合する第2のミキサーと、
この混合により得られた周波数から受信周波数を選択す
るバンドパスフィルタとを備えており、しかも送信系の
ミキサーと第1のミキサー、及び受信系のミキサーと第
2のミキサーとを夫々同じミキサーで構成している。
A satellite communication transmitting/receiving device of the present invention includes a transmitting system, a receiving system, and an intra-station return system, in which a frequency of a local oscillator of the transmitting system and a transmission frequency are mixed in the intra-station return system. a first mixer, a bandpass filter that selects a desired frequency from the frequencies obtained by this mixing, and a second mixer that mixes the frequency of a local oscillator of the receiving system and the selected frequency;
It is equipped with a band-pass filter that selects the receiving frequency from the frequencies obtained by this mixing, and the transmitting system mixer and the first mixer, and the receiving system mixer and the second mixer are each composed of the same mixer. are doing.

〔作用] 上述した構成では、送信系及び受信系に設けたローカル
発振器の周波数を利用して局内折返し系における周波数
変換を行ない、局内折返し系におけるローカル発振器を
不要にし、しかも局内折返し系に設けるミキサーを送信
系、受信系に設けたミキサーと同じものを利用し、送受
信装置の構成の簡略化、及び低価格化を達成する。
[Operation] In the above-described configuration, the frequency of the local oscillator provided in the transmitting system and the receiving system is used to perform frequency conversion in the local loopback system, thereby eliminating the need for a local oscillator in the local loopback system, and furthermore, the mixer provided in the local loopback system. By using the same mixers as those provided in the transmitting system and the receiving system, the configuration of the transmitting/receiving device can be simplified and the cost can be reduced.

〔実施例〕〔Example〕

次に、本発明を図面を参照して説明する。 Next, the present invention will be explained with reference to the drawings.

第1図は本発明の一実施例のブロック図である。FIG. 1 is a block diagram of one embodiment of the present invention.

送信系においてはIF周波数はローカル発振器1の出力
とミキサー3で混合され、バンドパスフィルタ7で希望
の周波数成分だけを取り出し、これを送信系電力増幅部
11で増幅してアンテナから出力させている。また、受
信系においてはアンテナから入力されて受信系電力増幅
部12で増幅されたRXRF周波数はローカル発振器2
の出力とミキサー4で混合され、バンドパスフィルタ1
0で希望の!F周波数だけを取り出している。これらの
送信系と受信系については第2図に示した従来構成と同
じである。
In the transmission system, the IF frequency is mixed with the output of the local oscillator 1 by the mixer 3, and only the desired frequency component is extracted by the bandpass filter 7, which is amplified by the transmission system power amplifier 11 and output from the antenna. . In addition, in the receiving system, the RXRF frequency input from the antenna and amplified by the receiving system power amplification section 12 is transmitted to the local oscillator 2.
is mixed with the output of mixer 4, and bandpass filter 1
Hopeful at 0! Only the F frequency is extracted. The transmitting system and receiving system are the same as the conventional configuration shown in FIG.

一方、局内折返し系においては、第1のミキサー5.バ
ンドパスフィルタ8.第2のミキサー6゜及びバンドパ
スフィルタ9をこの順に送信系と受信系との間に接続し
ており、ここではローカル発振器は設けてはいない。
On the other hand, in the local loopback system, the first mixer 5. Bandpass filter 8. A second mixer 6° and a bandpass filter 9 are connected in this order between the transmitting system and the receiving system, and no local oscillator is provided here.

そして、送信系のローカル発振器lの出力の一部を取り
出し、これを第1のミキサー5においてTXRF周波数
と混合し、バンドパスフィルタ8で希望の信号成分のみ
を取り出している。
Then, a part of the output of the local oscillator l of the transmission system is extracted, mixed with the TXRF frequency in the first mixer 5, and only the desired signal component is extracted by the bandpass filter 8.

ここで、TXRF周波数をF、ローカル発振器1の周波
数をFL O+バンドパスフィルタ7の中心周波数をI
Fとすると、 F=IF+FL0   ・・・(4) の関係式が得、られる。
Here, the TXRF frequency is F, the frequency of local oscillator 1 is FLO + the center frequency of bandpass filter 7 is I
When F is assumed, the following relational expression is obtained: F=IF+FL0 (4).

さらに、これで得られたIF周波数と、受信系のローカ
ル発振器2の出力の一部とを第2のミキサー6で混合し
、バンドパスフィルタ9で希望の信号成分のみを取り出
している。
Further, the IF frequency thus obtained and a part of the output of the local oscillator 2 of the reception system are mixed by the second mixer 6, and only the desired signal component is extracted by the bandpass filter 9.

ここで、ローカル発振器1の周波数をf LO+ バン
ドパスフィルタフの中心周波数をfとすると、f=IF
十fLo    ・・・(5)の関係式が得られる。
Here, if the frequency of the local oscillator 1 is f LO + the center frequency of the bandpass filter is f, then f = IF
10fLo...The relational expression (5) is obtained.

したがって、この構成によれば2つのローカル発振器1
,2の周波数を利用してTXRF周波数からRXRF周
波数を得ているので、局内折返し系におけるローカル発
振器を省略することが可能となる。これにより、少なく
とも局内折返し系の簡略化を図ることができ、これと同
時に装置の低価格化を達成することができる。
Therefore, according to this configuration, two local oscillators 1
, 2 is used to obtain the RXRF frequency from the TXRF frequency, it is possible to omit the local oscillator in the intra-station loopback system. This makes it possible to at least simplify the intra-office return system, and at the same time achieve a reduction in the cost of the device.

また、ここで、上述した周波数関係式に着目すると、(
1)−(4)、  (2)=(5)の関係である。これ
は、ミキサー3とミキサー5.及びミキサー4とミキサ
ー6は夫々同じ周波数変換を行っていることを意味して
いる。したがって、ミキサー3,5及びミキサー4.6
は夫々同じミキサーを使用することが可能となり、装置
の低価格化を更に促進できる。
Also, if we pay attention to the frequency relational expression mentioned above, (
The relationships are 1)-(4) and (2)=(5). This is mixer 3 and mixer 5. This means that mixer 4 and mixer 6 each perform the same frequency conversion. Therefore mixer 3,5 and mixer 4.6
It becomes possible to use the same mixer in each case, which further promotes a reduction in the cost of the device.

〔発明の効果〕〔Effect of the invention〕

以上説明したように本発明は、送信系、及び受信系の各
ローカル発振器の周波数を利用して第1及び第2の各ミ
キサーで周波数混合を行い、かつバンドパスフィルタで
選択することにより、送信周波数から受信周波数を得て
いるので、局内折返し系におけるローカル発振器を不要
にできる。また、第1及び第2のミキサーは送信系、受
信系の各ミキサーと同じものを利用することもできる。
As explained above, the present invention performs frequency mixing in the first and second mixers using the frequencies of the local oscillators in the transmitting system and the receiving system, and selects the frequency using the bandpass filter. Since the reception frequency is obtained from the frequency, a local oscillator in the intra-station loopback system can be eliminated. Further, the first and second mixers can be the same as the transmitting system mixers and the receiving system mixers.

これにより、衛星通信用送受信装置を簡略化し、低価格
に構成できる効果がある。
This has the effect of simplifying the satellite communication transmitting/receiving device and making it possible to configure it at low cost.

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

第1図は本発明の送受信装置の一実施例のブロック図、
第2図は従来装置の一例のブロック図である。 1.2・・・ローカル発振器、3.4.5.6・・・ミ
キサー、7,8,9,10.11・・・バンドパスフィ
ルタ、11・・・送信系電力増幅部、12・・・受信系
電力増幅部、13・・・ミキサー、14・・・バンドパ
スフィルタ、15・・・ローカル発振器。
FIG. 1 is a block diagram of an embodiment of the transmitting/receiving device of the present invention;
FIG. 2 is a block diagram of an example of a conventional device. 1.2... Local oscillator, 3.4.5.6... Mixer, 7, 8, 9, 10.11... Band pass filter, 11... Transmission system power amplifier section, 12... - Reception system power amplification section, 13... mixer, 14... band pass filter, 15... local oscillator.

Claims (1)

【特許請求の範囲】[Claims] 1、ローカル発振器、及びこの発振周波数と中間周波数
を混合するミキサーを有する送信系と、他のローカル発
振器、及びこの発振周波数と受信周波数とを混合するミ
キサーを有する受信系と、送信系の信号を受信系に折り
返す局内折返し系とで構成される衛星通信用送受信装置
において、前記局内折返し系には、前記送信系のローカ
ル発振器の周波数と送信周波数を混合する第1のミキサ
ーと、この混合により得られた周波数から所要の周波数
を選択するバンドパスフィルタと、前記受信系のローカ
ル発振器の周波数とこの選択された周波数を混合する第
2のミキサーと、この混合により得られた周波数から受
信周波数を選択するバンドパスフィルタとを備え、前記
送信系のミキサーと第1のミキサー、及び受信系のミキ
サーと第2のミキサーとを夫々同じミキサーで構成した
ことを特徴とする衛星通信用送受信装置。
1. A transmission system that has a local oscillator and a mixer that mixes this oscillation frequency and an intermediate frequency; a reception system that has another local oscillator and a mixer that mixes this oscillation frequency and the reception frequency; and a transmission system that In a satellite communication transmitting/receiving device comprising an intra-station return system that loops back to the reception system, the intra-station return system includes a first mixer that mixes the frequency of the local oscillator of the transmission system and the transmission frequency, and a first mixer that mixes the frequency of the local oscillator of the transmission system and the frequency obtained by this mixing. a bandpass filter that selects a desired frequency from the selected frequencies; a second mixer that mixes the selected frequency with the frequency of the local oscillator of the receiving system; and a receiving frequency that is selected from the frequencies obtained by this mixing. A transmitting/receiving device for satellite communication, characterized in that the transmitting system mixer and the first mixer, and the receiving system mixer and the second mixer are each composed of the same mixer.
JP10790688A 1988-04-30 1988-04-30 Transmitter-receiver for satellite communication Pending JPH01278132A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10790688A JPH01278132A (en) 1988-04-30 1988-04-30 Transmitter-receiver for satellite communication

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10790688A JPH01278132A (en) 1988-04-30 1988-04-30 Transmitter-receiver for satellite communication

Publications (1)

Publication Number Publication Date
JPH01278132A true JPH01278132A (en) 1989-11-08

Family

ID=14471063

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10790688A Pending JPH01278132A (en) 1988-04-30 1988-04-30 Transmitter-receiver for satellite communication

Country Status (1)

Country Link
JP (1) JPH01278132A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006345377A (en) * 2005-06-10 2006-12-21 Fujitsu Ltd Calibrating device and calibrating method of array antenna
JP2016195334A (en) * 2015-03-31 2016-11-17 株式会社東芝 Wireless device, loopback test device, and loopback test method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006345377A (en) * 2005-06-10 2006-12-21 Fujitsu Ltd Calibrating device and calibrating method of array antenna
JP2016195334A (en) * 2015-03-31 2016-11-17 株式会社東芝 Wireless device, loopback test device, and loopback test method

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