close

Вход

Забыли?

вход по аккаунту

?

Патент USA US2540415

код для вставки
Feb. 6, 1951
J. AlCARDl
2,540,414
RADIO GUIDING SYSTEM
Filed July 1, 1947
M
2
-
A
Transmitter
B
A
B
r Transmitter
Phase
2
A
\/
.
.
Qshi?erz 08mm“? (Tmnsmmerl
6
7
9
Transmitter-J 2
.
A ,Modulmorvk
Modulaton~
l
l er
I
Caz-sf‘:
3
9
-
Carrier Generator
'
B
Modumor
f
8
Phase Shifter l )
4
'
4
7
l '
3
l
=
‘Modulator
|
Currier
'
\Genemor
Oscillator fl
5 I-OscilIator fl
Amplifier
Filter
Detector
/ u
‘ |()
2
l2
‘'5
.
Detector
'3
\ 8
'
Filter
CA‘mpllfier
..
Oscillator f2
5
|7\
AmplifieD
>
'4
/ '
Detector
Bil/4
//
/
IO
I9
H
~
Fm"
Co u;a\f:r>\
"177!
2|
\
—
2o
(Ampli?er [ \ l3 / 1A"! llfie
DG‘I’GCTOI' Ccm'nul‘afarFilter )
Dated‘°'
INVEN TOR.
Patented Feb. 6, 1951
2,540,414
4’ UNITED STATES
QQFF-[CE
2,540,414
7
’
QRiADIIQK-IGUIDINGIJSY‘SIEM
' ’,~.J.orseph tAioar'di, ‘Versailles’, France, assign‘or’to
Sadir?Carp'entier, "Paris,
’ Societe lErancaise
,Franceiacorpom'tion o'f’France
_
'
rrAppli'ca’tionizlulyl-‘l, 1947i;seriai'Nn;.m5s;ss5
ire 'eGlaims; (01. 343-107)
. v
__
*1
Itihas‘atlreanyioeen proposed to ‘intiicatemadm
:‘sense in ‘ripreferred ‘ametho'd 'fld‘fvl'cbri'sttmitibm
, Iectricaliy atdirection-"byruse 'o'f-e'a-n interference
said
1E1‘ iihta‘ined' -by-".the~conibination of-itwo-leom
drawings:
I
1
.
'
Fig. 1 shows the arrangement of transmitting
;iponent‘?ields, "emitted‘by' radiating systemspla'ce‘d
aerials.
fratv 'a'certain’ distance "apart "and "taking-‘advantage ,
"(if1 the 'out=of=15h‘ase "conditions *of its‘?eIdSa‘tv the
,point of reception‘causedrbythe di‘?‘erence’inthe
‘Fdu'r'ation‘ ofithe travel “of. the "waves‘ ‘emanating
V
‘Fig. ‘=52 shows v‘the “transmitter "'tfee'ding anese
aerials.
_
3
- Fig. 8 ‘is ‘Pa *s'chematicldiagramco?‘a*receiver
‘adapted 11to I"lo'e-iusediin l’this invention.
_
- .
iithere‘from, these out-di-p‘haee .conditions‘varying
-#'*Fig.~”4
ewithi'ther .direction‘ Lin‘ which‘the ‘receiver ‘is situ
receiver-adaptedito‘be used‘withltliiseinvefftion.
tal'ted.
'
‘
-a,»schema‘tic vdiagram “of ta ‘modi?ed
‘Fig. v 5 ‘ is a ,schematic - diagram ‘of , >a. rmodi?ed
,
form of transmitter adapted to be used with...this
c 7 Such a system ofiiridicalting'is' 'for example de
scribed in Frenéh"1?atent ‘No. ‘630,248, 'lo‘dgéd‘on
iMay‘32'l, 1926; Jby ""Sociét‘é 'Anonyme’ Ondes Di'r'i
gg'ées,”=l:an‘d .ient‘i‘tle'd "“Location“Metho‘dZ”
14.‘: nFrom another._-poirit'of (view, there are "known
*invention.
"
‘According‘to a '?r‘s't'embodiment'?f the‘in‘véri
ition,‘ itwo ‘omnidirectional"aerials A ‘and is -.'('Fig. ~14)
transmit respectively, (1‘) :anonemodiilaltedi?'tilii
'Ha'accordingto‘tire-equation,
, also idirectiozif‘?riiiing,systems according'ito‘ which
‘lonemhearsJat/éthe; receiver aisoun‘d» of a certain
rHa=-"5an$in=wt
jfrequency, ‘withcla ‘predominating "intensity ‘if ‘the
'
_
_
ilhearer is on..one side ofithe directional ‘axis, the
i-soundi of another .ifrequency'being heard he is
w‘ibe'ing "trier-value 'o’f'ithe high "frequencyg‘trans
"mitted,=t—*andi(2~) 'a'?'eldHb o'f'thesame 'highiifre
m the ._other .sidalthe two‘ sounds 'being .‘heard
r'frequen‘ci‘es-?1'and$f2 preferably with’the-suppres
quency as A,‘simultaneously“modulated '='by‘ii*th'e
with an equal forceiflheiisonthe axis itself.
- .The -:pr'esent :invention concerns .a .‘direction
'i?nding “method and apparatus producing at the
,gpoint of reception “sounds ‘of frequency f1 .or J2
“equation:
's'ion
Hb=b'o'ffth‘e
[sin (when
Fcarrier "waves,
v"2163f‘-|-"sin"(wt~——‘(p2)
sin
‘
and la'ccording‘itol
Sin 210%]
2
faecordingetofthe relative‘ .location of "the receiver
with respect toltheiiirectional axis,.and'this,‘;b,y
making ‘use ‘of iinterierenceé?elds as'lhas Zbee'n
indicated ‘above;
-
-
‘
The aerials A and B are at a distance‘ ii‘l’from
:30 one another, dch-isdistance being-‘as is generally
the case small with ‘respect’ to that which sepa
- .The :present invention‘ has more particularly
afor
rates the "system ‘AB "from the're‘ceiving "station
‘lying ’in'”the direction AM'forming an angle 130
object?the ;production .of interference ?elds
“adapted tQLthe purposeinvdicat'sd.
‘
n
I
with the direction AB.
_ >u<l~According fto‘ithe Jinvention, .two fields --0'f lthe
'
It is thus apparent-tha?under these conditions
.;the _..?eld.vrecei-ved in lithe . direction .AM will have
. same‘ high ,.f_reguency, one of which is not modu
lated, and-‘the other "is'modul‘atedait the same
time by'the .audible frequencies f1 and fz‘ya'r‘e
transmitted‘ f's'iinultan'eou'sly ‘and-the "transmission
"'f or 'its _ value, .;no< - accountébceing
V
" ltakenr?feaggens
eral shifting common to both waves:
wéisf-produce'd iin‘i'sucha'a"zmannerlthatfthe respective
wisercentages "of ‘modul'ationgat ".the mointrofrecep
sti'on, 1 of .1- the: resultant .nrodulated :fi'éldrvary with
the supplementaryashifting asbetweenwltheewaves
tithe‘ :direction inlwhichiis ioundzthegrecei‘ver, these
transmitted from A and those coming from B
being set up by the supplementary path AB’ for
the waves coming from A. One has thus:
>-'peroentages zioftmodul‘ation ivaryingipreferably-u-in
iopposite' senses when ‘thisdirectionzchanges.
The invention thus arrives at the desired re
sults by operating on the depths of modulation
of the received ?eld, that is to ‘say, by the same
'F-“mechanism' as‘ ith'atl' whichr'lis "ima‘de'i'use o'f'iin 'the
m‘ being'Ythelvomm'0n’hi8h ifrequencyewaveiileiié‘th
“French -'-Patent No. $30,248 aforesaid, ‘although
‘the ‘expression ‘percentage‘of modulation is not
'Yexpress1y-'=-mentionedTtherein.
Theilinv 'on'e‘williibef-explained moreTin-detail
501
'emiitted'from—'A"andiB.
.
.
.
~
‘The receiver~sh0wn ‘in’ Fig? 3 wcomprises‘asing'le
high frequency ampli?er and detector-?uidised
low 5 {irequency
2,540,414:
4
shift of the currents of high frequency and also
constant amplitudes of such currents, which en
sures a permanent de?nition of the directional
axis in space.
a manner that each allows substantially only a
frequency f1 or f2 to pass therethrough. The cur
rents furnished by the low frequency ampli?ers
l2 and Mare fed to the two coils l6 and H re
So long as
spectively, of the indicator l5 according to al
ready known methods of direction ?nding oper
ating by means of two modulating frequencies.
It is possible obviously to replace the two low
d
A
is made sufficiently small, it will easily be seen
that Formula 2 not only gives a single suitable
value for 8, but also a single direction 0 for the
marked axis.
frequency ampli?ers l2 and M by a single am
pli?er 2| fed alternately through two ?lters H
and I3, by the use of input commutator l9 and
output commutator 20, permitting to pass, respec
It will be noted also that it is not necessary for
tively the frequencies f1 and f2 as shown in Fig. 4.
the
aerial B to transmit only the side bands of the
Obviously by the action of the detector and
transmissions; it may transmit also
the low frequency ampli?ers, there is received 15 modulated
the corresponding carrier wave so long as its
respectively at the output of these ampli?ers: a
amplitude is not greater than that of the side
current of a frequency ,f1 and of an amplitude
bands.
equal to the absolute value of:
It should also be noted that it is not essential
for the aerials used to be omnidirectional, that
k1 cos (ei-l-t)
20
is to say have a circular radiation diagram, and
and a current of frequency f2 and of an amplitude
the fact of using directional aerials can simply
equal to the absolute value of:
modify the law of variation of the out-of-phase
conditions as a function of the direction.
This
the coefficient k1 being the same in these two 25 permits in particular using these aerials having
a maximum transmission in the direction of the
formula.
marked axis (useful direction).
,1
The setting up of the ?elds He. and Hb is, as
, This results immediately from the fact that at
the input of the detector the respective percent
can be seen, very simple (Fig. 2). The high
frequency oscillat‘on generator I is connected
directly to the transmitter 2 which feeds aerial
ages of modulation of the modulated currents
received are respectively proportional to
[cos (<p1+6)] for f1 and [cos (<p2+6)] for f2
as is easily ascertained by making the vectorial
additions interpreting Formula 1 with the as
A. The generator I is connected to the phase
shifting device 3, which introduces a delay (p1
into the oscillation fed therethrough to the modu_
later 4 which also receives the frequency f1 from
the oscillator 5. The high frequency'oscillation
generator I also feeds oscil‘ations through the
phase ‘shifting device 6, that introduces the de
lay (p2 therein, to the modulator 1 which is also
connected to receive the frequency f2 from the
oscillator 8. The modulators 4 and ‘I operate
sumption that b is appreciably smaller than a, .
a condit’on easy to secure.
It remains to note that the assumption b small
with respect to a has been given out only so
as to simplify the formulae and to make the ex
planations easier; it is not necessary for the
carrying out of the invention and for obtaining
the advantages deriving therefrom.
.It will thus be seen that the direction ?nding
axis de?ned by the equality of the currents issu
ing from the two ampli?ers is determined by
the relation
cos (<p1+5) _=-_*— cos (qaz-l-B)
which leads to
qJ1+6+m1r=—-(<p2—|-6)
in parallel on a transmitter 9 feeding the aerial
B. It is clear that this arrangement can be sub
mitted to many modi?cations.
’
'
YThe above construction leads to utilising at
the point of the reception, the relative out-of
phase conditions between two similar ?elds He.
and Hb, each having an amplitude independent
of the direction of transmission.
50
as the equation with the sign + gives of course
no interesting result, the last equation may be
written
‘
This last condition is not however essential.
It is possible to design other constructions, as
shown in Fig. 5, producing the same result and
which in consequence come within the spirit, of
the present invention, for example the ?eld may
assume the shape corresponding to the formula: ‘
m being the whole number, 6 thus determined
Ha=tl sin wt (1+k cos 21rf1t)
gives 0 by the relation established above.
with
--
60
It is thus seen that x and at being known once
and for all as also the ratio
9
a
.
.
.
Hz>=b sin (wt-l-ip) cos 21rfzt ,
It is clear that in this modi?cation the percent
age modulation for the frequency ]‘1 is constant
in all directions and equal to k, while that rela
tive to f2 is a function of the direction 0 which
allows producing again a marked axis the direc
tion of which is a function of (p and of the ratio
the direction of one of the marked directions
is determined by‘ the value of the sum (Pl-I-(PZ
a
and depends only on the latter so that this direc
These
two
?e’ds
are
obviously very easy 7 to
tion may be adjusted by a modi?cation of the
value of this sum, which constitutes an important 70 transmit, their production being common knowl
edge in the art. This modi?cation is however
advantage of the method of guiding according
in principle less advantageous than the ?rst em
. to the invention.
bodiment disclosed since the percentage of modu
It is known, on the other hand, how to main
tain, in a precise manner (in, addition to the
'Of ll?eiransgliisd Wave-the lebiéétaet Phase
lation of only one of the frequencies f1, f2 varies
function-.91 the direstiszayléue 1.11 theiigv
2,540,414,
5
embodiment the percentage modulation of both
these frequencies vary in opposite senses, ob
viously giving greater accuracy in the de?nition
of the directional axis.
If at the receiving station there are employed
acoustical methods for comparing currents at
frequencies f1 and f2, these frequencies should
clearly be audible, but if one utilises other
methods (for example optical or electrical) it
is clear that it need not necessarily be so, as
in such cases these frequencies may be for ex
ample above the audible range.
What I claim is:
1. Radio position determining apparatus com
prising high frequency transmitting apparatus, a
pair of antennas connected to said transmitting
apparatus, said antennas being positioned in rela
tively close proximity to each other, low frequen
cy oscillation generating apparatus for producing
a pair of low frequency oscillations, modulator
apparatus for selectively modulating said high,
frequency transmitting apparatus in accordance
with said low frequency oscillations, and phase
adjusting apparatus connected to said high fre
quency transmitting apparatus for adjusting the
phase of the Waves radiated by said antennas so
that a ?eld is radiated having an axis along which
of ?lters tuned to select said modulation fre
quencies and apparatus responsive to the two
modulation frequencies to indicate the amplitudes
thereof whereby the operator of the mobile craft
may determine the side of the aforesaid axis the
craft is located.
5. Radio apparatus for direction ?nding com
prising a ?rst transmitter, a ?rst antenna con
nected to said ?rst transmitter, a second trans
mitter, a second antenna connected to said second
transmitter and disposed relatively near said
?rst antenna; a high frequency oscillation gen
erator connected to said ?rst and to said second
transmitters, oscillators for supplying a pair of
modulation frequencies, a pair of modulators dis
posed between said high- frequency oscillation
generator and said second transmitter for modu
latingsaid second transmitter with said pair of
modulation frequencies; a ?rst phase shifter con
nected between said high‘ frequency oscillation '
generator and the ?rst of said pair of modulators,
and a second phase shifter connected between
said high frequency oscillation generator and the
second of said pair of modulators, so that a ?eld
is radiated having an axis along which the re
sulting ?eld is modulated by the two modulation
frequencies, the amount of modulation of said
the resultant ?eld is modulated by the two low
frequency, oscillations equally and‘ on the oppo
site sides of which axis the resultant ?eld is mod
ulated to different degrees by each of said low
frequencies.
6
ratus comprising an ampli?er, a detector, a pair
?eld resulting from one of said frequencies in
creasing and the amount of modulation from the
other of said frequencies decreasing on opposite
‘
sides of said axis.
2. Radio position determining apparatus com
prising a ?rst transmitter, a ?rst antenna con
nected to said ?rst transmitter, a second trans
t
6. Radio apparatus for direction ?nding com
prising a ?rst transmitter, a ?rst antenna con
nected to said ?rst transmitter, a second trans
mitter, a second antenna connected to said sec
ond transmitter and disposed relatively near said
?rst antenna; a high frequency oscillation gen
erator connected to said ?rst and to said second
transmitter; oscillators for supplying a pair of
modulation frequencies, a pair of modulators dis
posed between said high frequency oscillation
generator and said second transmitter for modu
lating said second transmitter with said pair of
modulation frequencies; means for suppressing
the carrier of said second transmitter, a ?rst
phase shifter connected between said high fre
quency oscillation generator and the ?rst of said
pair of modulators, and a second phase shifter
connected between said high frequency oscilla
tion generator and the second of said pair of
mitter, a second antenna connected to said sec
ond transmitter and positioned in relatively close
proximity to said ?rst antenna, a high frequency
oscillation generator connected to said ?rst and
said second, transmitters, oscillator means for
producing a pair of modulation frequencies, a
pair of modulators connected between said high
frequency oscillation generator and said second
transmitter for modulating said second trans
mitter in accordance with said pair of modulation
frequencies, and apparatus for adjusting the
phase of the waves radiated by said ?rst and said
second antennas so that a ?eld is radiated hav
ing an axis along which the resultant ?eld is
modulated by the two modulation frequencies
equally, the percentage modulation'of said re
sultant ?eld by one of said modulation frequencies
increasing and the percentage modulation by the
modulators, so that a ?eld is radiated having an
other of said modulation frequencies decreasing
axis along which the resulting ?eld is modulated
mobile craft remote from said high-‘frequency
transmitting apparatus and having an ampli?er
modulation from the other of said frequencies de
creasing on opposite side of said axis.
by the two modulation frequencies, the amount
on opposite sides of said axis.
3. Apparatus as set forth in claim 1 further "‘ of modulation of said ?eld resulting from one of
said frequencies increasing and the amount of
comprising ,a receiving apparatus carried by a
and detector, a pair of ?lters adjusted to select
the pair of low frequency oscillations with which
the aforesaid resultant ?eld is modulated and
means connected to the output of said ?lters for
indicating the amplitudes of said low frequency
oscillations whereby the operator of said mobile
craft may determine the side of the aforesaid
axis the craft is located.
4. Radio ‘position determining apparatus as set
forth in claim 2 further comprisinga radio re
65
ceiving apparatus carried by a mobile craft re
70
mote from said transmitters and responsive to the
signal transmitted thereby, said receiving appa
.
.
JOSEPH AICARDI.
REFERENCES CITED
The following references are of record in the
?le of this patent:
UNITED STATES PATENTS
Number
Name
Date
1,919,556
Jacquemin _'_ _____ __ July 25, 1933
2,107,155
2,279,031
Kleinkauf et al. _____ Feb. 1, 1938
Cocherell et al. _____ Apr. 7, 1942
2,367,372
Purington ________ __ Jan. 16, 1945
2,414,431
2,417,807
Alford et a1 _______ __ Jan. 21, 1947
Brunner _________ __ Mar. 25, 1947
Документ
Категория
Без категории
Просмотров
0
Размер файла
519 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа