EP0077731B1 - Installation de télécommande du pointage d'une antenne réceptrice - Google Patents

Installation de télécommande du pointage d'une antenne réceptrice Download PDF

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Publication number
EP0077731B1
EP0077731B1 EP82401900A EP82401900A EP0077731B1 EP 0077731 B1 EP0077731 B1 EP 0077731B1 EP 82401900 A EP82401900 A EP 82401900A EP 82401900 A EP82401900 A EP 82401900A EP 0077731 B1 EP0077731 B1 EP 0077731B1
Authority
EP
European Patent Office
Prior art keywords
receiving
receiving antenna
arrangement according
antenna
gain
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.)
Expired
Application number
EP82401900A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0077731A2 (fr
EP0077731A3 (en
Inventor
Alain Cazals
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.)
Telediffusion de France ets Public de Diffusion
Original Assignee
Telediffusion de France ets Public de Diffusion
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 Telediffusion de France ets Public de Diffusion filed Critical Telediffusion de France ets Public de Diffusion
Publication of EP0077731A2 publication Critical patent/EP0077731A2/fr
Publication of EP0077731A3 publication Critical patent/EP0077731A3/fr
Application granted granted Critical
Publication of EP0077731B1 publication Critical patent/EP0077731B1/fr
Expired legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/02—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using mechanical movement of antenna or antenna system as a whole

Definitions

  • the present invention relates to a remote control installation for pointing a receiving antenna from the location of a transmitting antenna.
  • the receiving antenna can be rotated by motor means around the first and / or second predetermined directions which are those of the sites and azimuths.
  • Such a pointing procedure therefore requires the presence of the first operator and, as a corollary, additional transport costs when the receiving antenna is in an isolated location that is difficult to access.
  • the invention therefore aims to eliminate the presence of the first operator to perform the pointing of the receiving antenna.
  • the receiving antenna rotates not only around a first direction corresponding to the axis of the sites for example, but also around a second direction corresponding to the axis of the azimuths, under the control of second motor means.
  • the antenna is positioned separately in elevation and in azimuth, in order to optimize the gain according to the two parameters.
  • the first transmission means can transmit to the first reception means through the forward link either a first angle of rotation and first directives of advance of the first motor means, or a second angle of rotation and first directives of advance of the second drive means as soon as the second reception means have received either "end of aiming" information according to the first angle of rotation which is delivered by first means of detection of the first angle of rotation, or "end of aiming” information "According to the second angle of rotation which is delivered by second means for detecting the second angle of rotation, which" end of pointing "information is transmitted by the second transmission means through the return link.
  • Such automatic gain optimization means increase the speed of pointing and the operator's involuntary errors.
  • connection bilateral digital transmission makes it easy to connect the organs on the side of the transmitting antenna to the organs on the side of the receiving antenna regardless of where the transmitting antenna is located.
  • This link is preferably a radiotelephone link terminated by modems (modulators - demodulators) with telegraph channels in which the digital data are transmitted by frequency shift.
  • the embodiment described below concerns the remote control for pointing the receiving antenna of a radio relay from the transmitting antenna which is on board a broadcasting vehicle and which is in direct visibility with the antenna. receptor. Often the hertzian relay is established in an isolated place, hardly accessible. By way of example, certain numerical characteristics will be specified as the description progresses.
  • This turret is of the kind that supports a radar or receiving antenna receiving signals from a satellite.
  • the turret can be rotated in elevation and in azimuth. It comprises a vertical mast which rotates around a vertical axis 10A by means of a first power geared motor 11 A and scans the entire horizon from 0 to 360 °. At the upper end of this mast is rotatably mounted around a horizontal axis 10S a plate 12 which supports the receiving antenna 1. With respect to the horizontal, the antenna can pivot in elevation in a sector of 80 ° by means of a second 11 S power gearmotor. Each gearmotor is associated with a tachometer generator to form a servo system as will be seen below.
  • the two positioning parameters of the receiving antenna are indicated by means of two potentiometers with circular track and sensor brush 13S, 13A, in line with the axes of site 10S and azimuth 10A.
  • the positions of the sensor brushes are referred to two reference axes and, with respect to these, the deflections of the antenna 1 in azimuth and in elevation are ⁇ 190 ° and ⁇ 40 '.
  • the sensitivity of displacements is of the tenth of degree and their precision better than three tenths of degree.
  • the remote control installation according to the invention is split into two parts.
  • a first part is on board the vehicle associated with the transmitting antenna 2.
  • the second part is located in the radio relay.
  • Each of these parts comprises a transmission circuit 3, 4, and a reception circuit 5, 6, respectively.
  • the connection between circuits 3 and 6 on the one hand and between circuits 4 and 5 on the other hand is carried out by a bidirectional digital transmission medium established everywhere by the vehicle.
  • the transmission medium is a telephone link, the ends of which, on the vehicle side and on the radio relay side, are served by modems, 30-50 and 60-40.
  • this telephone link is a conventional radiotelephone link operating either in the 75 MHz band or in the 400 MHz band.
  • the transmission circuit 3 therefore transmits messages to the reception circuit 6 through modulators 30, a telegraph channel multiplexer 31 and the transmitting part 73 of the radiotelephone on the vehicle side, then through the receiving part 76 of the radiotelephone of the radio relay side and demodulators 60.
  • the transmission circuit 4 on the radio relay side transmits messages to the reception circuit 5 through modulators 40, a telegraph channel multiplexer 41 and the transmitting part 74 of the radiotelephone of the radio relay side, then through the receiving part 75 of the radiotelephone on the vehicle side and of the demodulators 50.
  • the data processed digitally in circuits 3 to 6 are transmitted in link 7 after a bivalent serial modulation obtained by frequency shift in the 30-50 and 40-60 modems. These modems conform to the recommendations and opinions of the CCITT.
  • two telegraph channels Ci and C 2 are assigned to transmit the data in the forward direction from 3 to 6 and three telegraph channels c 3 , c 4 and c 5 are assigned. to transmit the data in the return direction from 4 to 5.
  • the nominal frequencies of these channels will be indicated below in parentheses, respectively for logic level low 0 and logic level high 1.
  • the channels Ci (2100 Hz; 3000 Hz) and C 2 (800 Hz; 1200 Hz) convey words of 16 bits respectively between the modulator 30, and the demodulator 60, and between the modu reader 30 2 and demodulator 60 2 .
  • the data transmitted in the forward direction are intended for the remote control instructions for the movement of the turret.
  • the first channel Ci comprises a 12-bit word which is representative of the value of the azimuth A or of the site S on which the receiving antenna is to be positioned 1.
  • a thirteenth so-called selection bit SEL is at level 0 or at level 1 depending on whether the word is relative to the site or to the azimuth.
  • Two other bits form the address of the AAR receiving antenna for which the message is intended.
  • the signifying bit in the 12-bit word indicates the sign with respect to the respective reference axis. So the absolute value of the azimuth is an 11-bit word and can vary between 000, ° 0 and 204, ° 7 and that of the site is a 9-bit word and can vary between 00 °, 0 and 51 °, 1 .
  • the second 16-bit channel C 2 comprises a word decomposable into a two-bit directive word relating to the control of the operation of the turret, a second word inherent in certain characteristics of the broadcasting link between the antennas 2 and 1, and a third 2-bit word containing the address of the AAR receiving antenna for which the message is intended.
  • the first bit M / A of the command word controls the start or stop of the turret. More precisely, it controls the power supply by the sector of the geared motors 11S and 11A through two switches 14S and 14A, respectively (fig. 3 and 4).
  • the second bit AUT of the control word orders the automatic pointing of the turret, in elevation and azimuth according to the method described above.
  • the second word of channel C 2 comprises, among other things, a so-called operating field EXP, a so-called measurement field MES and a so-called request field for reading DLEC characteristics.
  • Each EXP or MES field is occupied by an address which relates to a specific high frequency band in which signals that can be used in broadcasting can be transmitted. It will be assumed that the number n of these high-frequency bands are two, HF 1 and HF 2 , and have the addresses EXP, and EXP 2 in operating mode and MES, and MES 2 in measurement mode. Signal and noise level measurements in such high-frequency bands make it possible to select the one which presents, at the level of the receiving antenna, the best quality for operation. As shown in fig. 3, in the receiving part of the radio relay, the HF and HF channels 2 lead to a two-position switch 15 which selects the usable signal, during operation, during the transmission of the composite video signal by the transmitting antenna 2.
  • Each switch 16 1 , 16 2 is closed for access to measuring devices such as a low-frequency signal level detector 17 1 , 17 2 and a video noise level detector 18 1 , 18 2 on the respective route HF 1 , HF 2 . Since a number of high frequency channels equal to two has been assumed, each information field EXP and MES comprises a bit, for example at level 1 to address the first HF channel, and at level 0 to address the second HF 2 channel.
  • the DLEC characteristics read request field is cut by a read address designating one of the recording devices of the transmission circuit 4 (fig. 3), such as a memory 42s or 42a of the transmission circuit. 4, which stores the instantaneous value of the site s or the azimuth a of the turret during a pointing operation, or such as a detector 17 1 , 18 1 , 17 2 or 18 2 which evaluates the instantaneous value low-frequency level nbf 1 , nbf 2 or video noise nv i , nv 2 . As long as such a DLEC address is present in the channel C 2 , said instantaneous value will be transmitted to the reception circuit 5 on the side of the transmitting antenna 2.
  • the channels c 3 (2100 Hz; 3000 Hz), c 4 (800 Hz; 1200 Hz) and c 5 (300 Hz; 600 Hz) convey 16-bit words respectively between the modulator 40 3 and the demodulator 50 3 , between the modulator 40 4 and the demodulator 50 4 and between the modulator 40 5 and the demodulator 50 5 .
  • the data transmitted by the three channels c 3 , c 4 and c 5 are intended to indicate to the operator in the vehicle, the operating status of the turret and the results of the measurements with a view to monitoring the procedure for pointing.
  • the third channel c 3 comprises n 8-bit words indicating the instantaneous gain of each of the high-frequency channels, ie 2 words g 1 and g 2 relating to the HF 1 and HF 2 channels according to the illustrated embodiment. Each gain is inversely proportional to the value of the power picked up by the receiving antenna 1.
  • the gains g 1 and g 2 are transmitted to two analog-digital converters 431, 432 from two automatic gain control circuits (AGC) 19 1 and 19 2 inserted on the HF, and HF 2 channels, as shown in fig. 3.
  • AGC automatic gain control circuits
  • an automatic gain control circuit is generally inserted between a preamplifier, downstream of the mixer of the receiving part, and a phase distortion corrector.
  • the automatic gain control circuit detects the output voltage of several amplifiers in series 190 1 , 190 2 and compares it with a reference voltage.
  • the correction voltage resulting from the difference between these two voltages slaves the amplifiers and is representative of the power gain g.
  • the values g, and g 2 are continuously transmitted in the channel c 3 so that the operator correctly points the receiving antenna on the transmitting antenna by a procedure of minimizing the values g 1 and g 2 and therefore maximizing the powers captured.
  • the fourth channel c 4 is composed, inter alia, of a 4 bit turret status word and a second status word of the high frequency channels. These words are permanently transmitted by the transmission circuit.
  • the first of these last words is composed of an on / off bit, m / a, two so-called validation bits in site and in azimuth, vs and go, and a bit called automatic pointing aut.
  • the first bit m / aa has the same meaning as the bit M / A of channel C 2 and indicates whether or not power is applied to the electrical components for controlling the turret, such as the geared motors 11S and 11A.
  • the status of a validation bit vs, va signals to the operator that the turret rotates around the axis of the 10S sites or 10A azimuths during a pointing operation in order to inhibit any emission of a site value S or azimuth A by the emission circuit 3 as long as the turret is not stabilized. If vs or va is equal to zero, the operator will be able to send new words S or A to refine the score.
  • the last bit aut indicates whether the turret is in the automatic pointing phase or not.
  • the second word of channel c 4 includes a so-called exp operating field and a so-called measurement field mes which respectively contain one of the expi and exp 2 addresses and one of the mes 1 and meS 2 addresses relating to high-speed channels.
  • -Frequency HF 1 and HF 2 just like the field EXP and MES of channel C 2 .
  • the contents of these fields inform the operator of the state of the HF and HF 2 channels prior to an operation or measurement phase in order to properly control the switches 15 and 16 through the channel C 2 .
  • the fifth channel c 5 contains, according to the illustrated embodiment, an instantaneous characteristic word MC required by the operator, in correspondence with the address of the recording device contained in the word request for reading DLEC of channel C 2 .
  • the word MC can therefore be equal to s, a, nbf 1 , nbf 2 , nv 1 or nv 2 .
  • the words contained in the channels c 3 and c 4 are transmitted cyclically permanently so that the operator monitors the operation of the turret and the measurements and that the word contained in the channel c 5 is transmitted cyclically as long as a address word DLEC has not been deleted in the reception circuit 6.
  • the channel words C 2 and c 3 are sent on request by the operator.
  • the transmission speed in these five channels can be uniform and equal to 50 baud. Higher speeds can be envisaged, for example equal to 200 bauds.
  • a control console This comprises a function keyboard 32 associated with a display device 33 which displays the initial data to be transmitted, and a display device 52 which displays the data transmitted by the transmission circuit 4.
  • the display device 33 of the transmission circuit 3 has two segment displays 33S and 33A of decimal values of site S and of azimuth A, at least five LEDs 330 to 334 whose illuminations correspond respectively to the states of bits M / A, AUT, EXP, MES and at the address AAR, and a segment display 33D which, after decoding of the word DLEC, displays in plain text the values of positions or levels conveyed by one of the words s, a, nbf and nv.
  • two buses 320 and 321 with 16 wires respectively pass the data of the channels C 1 and C 2 from the keyboard 32 to the displays 33S and 33A and a buffer register 34 with 16 stages and to the displays 330 to 334 and 33D and a second 16-stage buffer register 35.
  • the reading of the buffer register 35 is authorized directly by a particular key of the keyboard 32 through a wire 322. This reading will be ordered each time one of the words making up the channel C 2 is modified.
  • the reading of the content A or S of the buffer register 34 is carried out by means of a read authorization circuit with logic gates 36.
  • the circuit 36 receives from the keyboard 32 a read authorization pulse from the register 34, via a wire 323, and the selection bit SEL distinguishing a word A from a word S in the channel Ci, via a wire 324 of the bus 320. Wire 324 is also used to select the displays 33S and 33A.
  • the read authorization circuit 36 also receives the validation bits va and vs on two wires 37 and 38 from the output bus 51 4 of the demodulator 50 4 assigned to the channel c 4 .
  • the read permissions are similar for the words A and S.
  • the "validation" information goes, vs cannot prevent the sending of a new control word to the register 35 and the modulator 30 2 .
  • the display device 52 of the reception circuit 5 has a segment display 520, two galvanometers 521 and 522 and six LEDs 524 to 529.
  • the illuminations of the LEDs 524 to 529 are dependent on the states of the respective bits m / a, vs, va, aut, exp and mes which are conveyed by the fourth channel c 4 and which are delivered by the output bus 51 4 of the demodulator 50 4 .
  • the two galvanometers 521 and 522 indicate the analog values of the gains g 1 and g 2 in the high frequency channels HF, and HF 2 . Each of them is connected to 8 corresponding wires of the output bus 51 3 of the demodulator 50 3 assigned to the third channel c 3 , through a respective digital-analog converter 531, 532.
  • the display 520 is suitable for indicating the instantaneous value of the site s or of the azimuth a and one of the analog levels nbf 1 , nbf 2 , nv 1 and nv 2 measured by the detectors 17 1 , 17 2 , 18 1 and 18 2 included in the radio relay.
  • the output bus 51 5 of the demodulator 50 5 is connected to the display 520.
  • a system 8 consists of a direct chain and two return chains for regulating both the speed and the position (site or azimuth).
  • the direct chain comprises an amplifier 80 preceding the geared motor 11.
  • the first return chain comprises a tachometric generator 81, an integrator 82 and an attenuator 83 with an attenuation coefficient k 1 .
  • the second return chain comprises the feedback potentiometer 13 followed by an attenuator 84 with an attenuation coefficient k 2 .
  • the input of the servo system receives the analog value of the setpoint, site S or azimuth A, through a digital-analog converter 85 to apply it to the direct input of the differentiator 86 producing the error signal ⁇ applied to amplifier 80; the outputs of the two return chains are connected to the reverse inputs of the differentiator 86.
  • the geared motor 11 is energized through the switch 14 controllable by the wire 611.
  • the output of the geared motor 11 constitutes the corresponding rotating shaft 10.
  • potentiometer 13 indicates the instantaneous true analog value of the position, in site s or in azimuth a, which is memorized cyclically in the corresponding memory 42 through an analog-digital converter 87.
  • the unit 61 includes a computer mainly used for the so-called automatic pointing procedure, as will be seen below. .
  • the reception circuit 6 comprises two buffer registers 621 and 622 in which are transferred the data words which have been transmitted in the channels C, and C 2 and which have been demodulated by the demodulators 60, and 60 2 .
  • the unit 61 reads .cyclically via the bus 610 the contents of the registers 621 and 622 in order to check first if the word AAR is equal to its address, then if changes have occurred in the data transmitted.
  • the reception circuit 6 also includes two buffer registers 63S and 63A which are connected to the inputs of the converters 85A, 85B of the site control systems 8S and in azimuth 8A, respectively.
  • each of the registers 63S and 63A is delivered by the unit 61 each time the transmitted value, A or S, in the channel Ci has been modified and when the corresponding validation bit is in the zero state, which indicates the idle state of the turret.
  • the operator transmits via the keyboard 32 (fig. 2) the address word AAR and the bit M.
  • a basic pointing procedure for the azimuth is done in a similar manner via wires and control buses 611A to 615A which have equivalent roles to wires and buses 611 S to 615S respectively. Also, the operator can simultaneously carry out two elementary elevation and azimuth pointing procedures, according to another embodiment.
  • the transmission circuit 4 comprises a memory 44 which stores all the data assigned to the channel C4 and the contents of the different cells of which are periodically refreshed by the unit 61, via the bus 615, in response to any modification either of the contents of the buffer registers 621 and 622, that is to say the evolution of the turret pointing. During each period, the content of memory 44 is introduced into channel C4 through the 16-wire input bus 45 4 of modulator 40 4 .
  • the transmission circuit 4 also includes three analog-digital converters 431, 432 and 433.
  • the first two 431 and 432 transmitting the digital values gi and g 2 to the 2 x 8-wire input buses 45 3 of the modulator 40 3 , through two sets of eight doors ET 46 1 and 46 2 . These doors are opened periodically, via wire 616, by unit 61 at the same rate as that for writing and reading from memory 44.
  • the writing frequency of memories 42s and 42a is that of reading of the buffer registers 63S and 63A transmitted by the wires 614S and 614A, while their writing frequency is that of writing and reading of memory 44 as well as d doors 46 1 , 46 2 and a set of doors AND 46 5 .
  • This latest set of dessert doors the output buses of memories 42s and 42a as well as the outputs of level detectors 17 1 , 17 2 , 18, and 18 2 through an analog OR circuit 47 and the third analog-digital converter 433.
  • the output of AND gates 46 5 is connected to the 16-wire input bus 45 5 of the modulator 40 5 .
  • the unit 61 reads one of these members via an addressing bus 617 also connected to the switches 15 and 16.
  • the manual control members of the receiving antenna 1 can cooperate with the control unit 61 so that a maintenance team can disconnect the unit from control or use it for measurement purposes in situ or in connection with the devices of a distant vehicle with transmitting antenna.
  • the procedure for pointing the receiving antenna is carried out step by step, by transmission of the parameters in the channels C 1 and C 2 at the discretion of the operator.
  • the previous elementary procedure consists in pointing the receiving antenna 1 of the radio relay strictly at the desired position. This does not correspond a fortiori to the optimum of received power and must generally be followed by several elementary pointing procedures in order to obtain the minimum gain.
  • the optimum score which corresponds for each positioning parameter, site or azimuth, to a minimum gain can also be achieved automatically according to a second embodiment.
  • This pointing is carried out under the control of a computer such as a microprocessor, which is inserted in the control unit 61 (fig.
  • the start of the automatic pointing procedure is analogous to that of a previous elementary pointing procedure, that is to say until the read order of the buffer register 63S or 63A.
  • the unit 61 no longer orders on the bus 616 the cyclical transmission of data through the return channels c 3 , c 4 and c 5 during the automatic pointing procedure.
  • the unit 61 permanently receives the power gain received g 1 or g 2 , via the output buses of the analog-digital converter 431 or 432, and the instantaneous position selected or a, via the buses. of the analog-digital converters 87 of the 8S or 8A servo system.
  • the above address AAR of the receiving antenna is intended to select one of the relays hertziens according to the invention in the same region, or in different regions by a single vehicle with transmitting antenna.
  • several vehicles can call on the same radio relay.
  • each transmitting antenna and the radio relay transmitting the address specific to the vehicle at the same time as each message.
  • the radio relay unit 61 will establish a pointing priority between the vehicles, and each vehicle will only display the data which are specific to it.
  • the outgoing telegraph channels Ci, C 2 and return c 3 , c 4 , c 5 can be combined into a single bidirectional channel which makes it possible to provide a voice channel in the radiotelephone channel.
  • the single telegraph channel is normalized to 200 baud and bandwidth equal to 480 Hz, centered on the frequency 2.4 kHz.
  • the sound channel is filtered in a band between 0.3 and 2 kHz.

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  • Variable-Direction Aerials And Aerial Arrays (AREA)
EP82401900A 1981-10-19 1982-10-15 Installation de télécommande du pointage d'une antenne réceptrice Expired EP0077731B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8119604A FR2514954A1 (fr) 1981-10-19 1981-10-19 Installation de telecommande du pointage d'une antenne receptrice
FR8119604 1981-10-19

Publications (3)

Publication Number Publication Date
EP0077731A2 EP0077731A2 (fr) 1983-04-27
EP0077731A3 EP0077731A3 (en) 1983-05-25
EP0077731B1 true EP0077731B1 (fr) 1984-08-08

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Application Number Title Priority Date Filing Date
EP82401900A Expired EP0077731B1 (fr) 1981-10-19 1982-10-15 Installation de télécommande du pointage d'une antenne réceptrice

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EP (1) EP0077731B1 (enExample)
DE (1) DE3260544D1 (enExample)
FR (1) FR2514954A1 (enExample)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2654885B1 (fr) * 1989-11-20 1992-03-13 Intertechnique Sa Procede et installation de transmission de signal a large bande a partir d'un equipement mobile.
FR2693329B1 (fr) * 1992-07-06 1994-09-09 Sfp Procédé et système de pointage de deux antennes l'une en direction de l'autre.
US5488737A (en) * 1992-11-17 1996-01-30 Southwestern Bell Technology Resources, Inc. Land-based wireless communications system having a scanned directional antenna
EP0660131A1 (en) * 1993-12-23 1995-06-28 Karl Osen Camera guidance system
GB2327566A (en) * 1997-07-17 1999-01-27 Northern Telecom Ltd Method of Orienting an Antenna
GB2414137A (en) * 2004-05-12 2005-11-16 Univ Sheffield Control of Antenna Line Device.
CN108306108A (zh) * 2017-12-18 2018-07-20 南京濠暻通讯科技有限公司 一种用于dvb-t天线的伺服控制装置及控制方法

Family Cites Families (1)

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Publication number Priority date Publication date Assignee Title
DE2724198C3 (de) * 1977-05-27 1981-11-26 SIEMENS AG AAAAA, 1000 Berlin und 8000 München Verfahren zur Optimierung der Betriebseigenschaften einer Richtfunkübertragungsstrecke

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
JAPAN TELECOMMUNICATIONS REVIEW, vol. 17, no. 4, Octobre 1975, pages 284-286, Tokio (JP); Y. YAMAOA et al.: "New 11/15 GHZ transportable Microwave radio system for emergency use" *

Also Published As

Publication number Publication date
FR2514954B1 (enExample) 1983-11-18
DE3260544D1 (en) 1984-09-13
EP0077731A2 (fr) 1983-04-27
FR2514954A1 (fr) 1983-04-22
EP0077731A3 (en) 1983-05-25

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