GB2290876A - Antenna system including a spectrum analyzer and use in a missile homing head - Google Patents
Antenna system including a spectrum analyzer and use in a missile homing head Download PDFInfo
- Publication number
- GB2290876A GB2290876A GB8727800A GB8727800A GB2290876A GB 2290876 A GB2290876 A GB 2290876A GB 8727800 A GB8727800 A GB 8727800A GB 8727800 A GB8727800 A GB 8727800A GB 2290876 A GB2290876 A GB 2290876A
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- Prior art keywords
- signals
- frequency
- samples
- antenna
- spectrum analyzer
- Prior art date
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- Granted
Links
- 238000001228 spectrum Methods 0.000 title claims abstract description 23
- 230000009183 running Effects 0.000 claims abstract description 11
- 238000006243 chemical reaction Methods 0.000 claims abstract description 7
- 238000010183 spectrum analysis Methods 0.000 claims abstract description 7
- 230000001131 transforming effect Effects 0.000 claims description 10
- 230000005540 biological transmission Effects 0.000 claims description 5
- 230000015572 biosynthetic process Effects 0.000 claims description 5
- 230000009466 transformation Effects 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 4
- 230000005855 radiation Effects 0.000 claims description 4
- 238000005755 formation reaction Methods 0.000 claims 4
- 230000000694 effects Effects 0.000 claims 1
- 101150008604 CAN1 gene Proteins 0.000 abstract description 2
- 101150063504 CAN2 gene Proteins 0.000 abstract description 2
- 238000012545 processing Methods 0.000 description 7
- 238000001514 detection method Methods 0.000 description 4
- 235000009421 Myristica fragrans Nutrition 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000001115 mace Substances 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009740 moulding (composite fabrication) Methods 0.000 description 1
- 238000010606 normalization Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/06—Systems determining position data of a target
- G01S13/08—Systems for measuring distance only
- G01S13/32—Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated
- G01S13/34—Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated using transmission of continuous, frequency-modulated waves while heterodyning the received signal, or a signal derived therefrom, with a locally-generated signal related to the contemporaneously transmitted signal
- G01S13/343—Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated using transmission of continuous, frequency-modulated waves while heterodyning the received signal, or a signal derived therefrom, with a locally-generated signal related to the contemporaneously transmitted signal using sawtooth modulation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/06—Systems determining position data of a target
- G01S13/08—Systems for measuring distance only
- G01S13/32—Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated
- G01S13/34—Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated using transmission of continuous, frequency-modulated waves while heterodyning the received signal, or a signal derived therefrom, with a locally-generated signal related to the contemporaneously transmitted signal
- G01S13/347—Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated using transmission of continuous, frequency-modulated waves while heterodyning the received signal, or a signal derived therefrom, with a locally-generated signal related to the contemporaneously transmitted signal using more than one modulation frequency
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/06—Systems determining position data of a target
- G01S13/42—Simultaneous measurement of distance and other co-ordinates
- G01S13/44—Monopulse radar, i.e. simultaneous lobing
- G01S13/4463—Monopulse radar, i.e. simultaneous lobing using phased arrays
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/50—Systems of measurement based on relative movement of target
- G01S13/58—Velocity or trajectory determination systems; Sense-of-movement determination systems
- G01S13/583—Velocity or trajectory determination systems; Sense-of-movement determination systems using transmission of continuous unmodulated waves, amplitude-, frequency-, or phase-modulated waves and based upon the Doppler effect resulting from movement of targets
- G01S13/584—Velocity or trajectory determination systems; Sense-of-movement determination systems using transmission of continuous unmodulated waves, amplitude-, frequency-, or phase-modulated waves and based upon the Doppler effect resulting from movement of targets adapted for simultaneous range and velocity measurements
Landscapes
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
In an antenna system eg for a missile homing head, range and velocity data is analysed by spectrum analyzer for sets of n signals with a bandwidth B and total duration T, including means CAN1 for analog-to-digital conversion of the n signals to be analysed, operating at a frequency nB and acting on all of the n signals to be analysed, during a time T, through time division multiplexing; means Mö for storing the digitised signals thus obtained, defined both by their rank in a sequence of samples of duration T relative to a signal to be analysed and by their running number of the set; means for addressing in write mode and in read mode thes storage means M1, allowing write operations at a frequency nB, in order of sample rank for successive sets and read operations, at a frequency 2nB in order of successive sets for each sample rank; means CAN2 for digital-to-analog conversion of the digitised samples thus read, operating at a frequency 2nB; and a spectrum analyser AS, with a bandwidth 2nB, performing in succession a spectral analysis of said n signals during a time T. <IMAGE>
Description
Spectrum analyzer, its application to a missile homing head of the type wit separate and fixed transmitting and receiving antennas, and missile homing head of the type with separate and fixed transmitting ana receiving antennas including such a spectrum analyzer
Background of the invention
The present invention relates in general to the field of electrical signal processing.
It applies more particularly to a device capaole of performing a spectral analysis of n signals having á certain spectral bandwidth B and a certain duration T, under stringent conditions processing speed and size constraints.
Such a device can be used, for example, in the field of radar. As a matter of fact, in order to detect possible targets, a radar must in particular perform a range and velocity analysis of the portion of airspace illuminated by the antenna, and this in a minimum of time ano witn a minimum size of the corresponding haraware.
A type of radar in which these problems are the most severe is a radar missile homing head, ana in particular such a missile homing head with separate ano fixed transmitting and receiving antennas, including a transmiting antenna with a relatively wide radiation pattern, transmitting a quasi-contl- nuous wave a receiving antenna provided with a plurality of radiating elements and means for the Droation of teams asso
dated witn the receiving antenna and allowing instantaneous
scanning of the airspace coverea by tne transmission beam.
In this case, tne n signals with a bandwidth 3 and a duration
T to be analyzed are constituted by tne signals from the n
radiating elements, or sensors, of the receiving antenna.
Summarv of the invention
An object of the present invention is a spectrum analyzer allowing, thanks to a judicious com3ination of digital proces
sing means and analog processing means, to combine a-high processing speed and a small size.
According to the invention there is provided a spectrum analyzer for n signals with a bandwidth B and a duration T including:
- analog-to-digital processing means for tne n signals to be analyzer, operating at a frequency nB and acting on all of
the N signals to be analyzed, ouring a time T, through time
division multiplexing;
- means fo storing the digitized samples tnus obtained, tnat
are defined by their rank in a sequence of samples with a du
ration T relative to a signal to be analyzed and by the run
ning number of this signal to be analyzed;;
- means for addressing, in write ano reao modes, these storage
means, allowing write operations, at a frequency nB, in order
of sample ranK and, for a given sample rank, in order of run- ning number of the signal to be analyzed, and read operations,
at a frequency 2nB, in order of running number of the signals
to 3e analyzer and, for a given running number of a signal
to be analyzed, in order of sample rank; - means for digital-to-analog conversion of the digitized samples tnus read, operating at a ZnB frequency; - an analog spectrum analyzer, with a 2nB 'tandwidth, per for ming in succession a spectral analysis of the n signals, during a time T.
Other oojects and features of the present invention will appear from the following descrirtion of an embodiment corresponding more particularly to the application to a missile noming head mentionned above, this description being made with reference to the accompanying drawing, in which - Figure 1 shows the general architecture of a missile homing head of the type with separate and fixed transmitting and receiving antennas; - Figure 2 is a diagram showing the shape of tne signals transmitted 5 the transmitting antenna; - Figure 3 is a schematic illustrating the analog orocessing performed in the reception modules associated with the radiating elements of the receiving antenna;; - Figure 4 is a diagram showing the spectral Dandwidtn oc@u- pied by the signals from the radiating elements of tne recei- ving antenna; - Figure 5 15 2 schematic of a spectrum analyzer in which the invention is embodied; - Figures Sa and 6b are diagrams illustrating the operation of tne spectrum analyzer of Figure 5; and - Figure 7 is a schematic of a device for tne formation of reception teams, associated with à spectrum analyzer as in
Figure 5 within the scope Df the above-mentioned applicati n.
Description of a preferred embodiment
Considering Figure ,, there is shown a missile homing head whose transmitting and receiving antennas are separate and fixed.
The transmitting antenna is located in tne nose cone of the missile ana illuminates in an omnidirectional manner the volume of interest. The receing antenna ocated behind the transmitting antenna, is flat and maoe uo Of n radiating elements associated wltn n incependent reception modules.
These reception modules do not include any microwave linkage with the local oscillator (L0) : the local oscillator feeds an antenna of very small size, located on the back of the transmitting antenna and illuminating the group of modules. The output signals from the modules, prefera@ly with zero carrier frequency, after complex demodulation, are combined linearly in order to obtain, through computation, a group of simultaneous and adjecent reception beams: these Seams allow instantaneous scanning of tne whole airspace covered by tne transmission beam by means of parallel channels. The linear omputational operator can, for example, perform a Fourier transformation from the samples constituted by the output sis- nals from the mocules, in order to obtain a group of crthogo- nal beams. The transmission and reception functions are simuitaneous.
The transmitted waveform is continuous. The transmitted sequences are of t no types - a sequence of 16 adjacent pulses witri @ duration of 1 milli- second and a frequency f0, as shown in Fig.re 2a; - a sequence of 16 acjacent pulses with a curation of 1 ms and frequencies f1, f2, ..., f16, as shown in Figure 2b.
The first of these sequences is used to measure the Doppler shift of the targets, while the second is used to compute their range. We shall consider more particularly the first case.
The receiving antenna s@own in rigure 3 is made up of 100 radiating elements and 100 reception modules, disposed to form a two-dimensional array with 10 elements by row and 10 by column.
The signals received by each receiving module are mace up of - radar signals at the frequency f0 f0 + fd, f3 : transmitted frequency, fd : Doppler shift;; - the reference from tne local oscillator at the frequency : f0L = f0 - fi, (fi : intermediate frequency); - the back radiation of the transmitting antenna'at the frequency f0.
These signals are mixed in a diode 0, amplified in an amplifier A and filtered by a band-pass filter F with a band- width centered on the frequency fi + 150 kHz. Tne assumption made here is that the clutter extends from -100 kHz to -100 kHz about the frequency fi and that tne target detection interval is included between fi + 100 kHz and f1 + 200 kHz (see
Figure 4).
The spectrum analyzer shown in Figure 5 will now be des cribed.
The output of each of the filters F in @igure 3 is sampled as a complex quantity (in amplitude and in pnase) at a 100-kHz cleck frequency, i.e., every 10 microseconds, by an analog-todigital converter CAN, common to the various reception m@@u- les.
The complex samples corresponding to a sampling instant of time of the 100 filters can be time-division multiplexed if the chosen sample-and-hold circuit CAN1 operates at 10 MHz '100 x 100 kHz).
Under these conditions the 100 modules are sampled in succession at the frequency of 10 MHz.
These samples are cooed into 8-bit worms ana stored in
memory M1 at an address that ccrresDoncs 30th to their rank r, i.e., to their sampling time, and to tne running number n of the reception module they come from. @@e storage of these samples occurs as they are cotainec, i.e., cy sample rank, according to the timing of figure Sa.
in this way, 100 complex samples per mocule are written into the memory, that is a millisecona (100 x 1G microseconds) of received signal per module. The memory must nave a capacity of 2 x 8 x 100 x 100 bits, that is 160 kbits, i.e., one 256kbit package or three 64-kbit packages.
This memory M1 is then read back, module @y module, at a clock frequency of 20 MHz. This means that tne signal of 1 ms associated wit a module (among 100 @a@ nas been writ- ten in at a frequency of 100 kHz is read back without distortion at a frequency of 20 MHz.
This signal with a duration of 1 ms an a bandwidth of 100 kHz comes, therefore, after this time compression by a factor of 200, a signal or 5-sec duration and 20-MHz bandwidth.
The signals from tne 100 modules n = 1, 2, ..., 100 can, consequently, be easily read back in succession in 1 ms with the timing shown in Figure 60.
This sequence of signals is tnen con@erted oack to analog form by two 8-bit digital-to-analog converters such as CNA operating at 20 MHz and followed by a complex modulation (single-sideband modulation) at an intermediate frequency.
The resulting analog signal made up of 5- s slices separated by dead times of 5 s Figure 6b) enters a surface-wave analog spectrum analyzer AS of the CMC type (Convolution-Mul- tiplication-Convolution) with a 20 MHz Bandwidth, that is 100 points, intended for "Doppler filtering". This spectrum analyzer operates in the following way.
A first convolutIon is carried out hy means of a first dispersive filter CONV witn a bandwidth 8 = 20 MHz and a delay T = 5 s. A multiplication by a frequency ramp with a rano- width B = 40 MHz and a duration T = 10 ps is then arried out on the resulting signal by means of a multiplier M. A secona convolution is finally carried out on the resulting signal by means of a second dispersive filter CONV2 with a bandwidth
B = 20 MHz and a delay T = 5 ps.
The choice of a CMC architecture allows to perform a weighting operation by performing tne second convolution, as shown in symbolic manner in Figure 5.
The insertion of cead times of 5 s ana, therefore, of a clock frequency in the read mode twice tnat of the write mode allows to have fully completed the spectral analysis re- lating to a n-th module before beg inning tne spectral analysis relating to the (n+1)-th module.
Tnis spectrum analyzer gives rack an analog signal made up of new 5- s slices that represents, cn the time scale, tne result of the Fourier analysis within 200 kHz of the inci- dent slices of 5 s-duration and 20-Mnz bandwidth, i.e., taking into acco@nt the time compression ratio of 200 achieved in the memory, tne result of the Fourier analysis to within @ kHz
o f the slices of 1-ms duration and 100-kHz bandwidt@ from the 100 reception modules.
This new signal is digitized after complex demodulation (amplitude-phase detection) into 8-bit words at a clock frequency of 29 MHz in an analog-to-digital converter such as
CAN2, in each of the sine and cosine channels, to be stored in a further mem@ry M2 with 10,000 16-bit locations, organized in receptior module number '1 to 100) and in Doppler shift 100 increments of 1 kHz).
Tnis latter memorv can De viewed as mace up of 100 planes of Doppler shift, each of these 3lanes representing at the frequency in question, tne receiving antenna mace up of 10 x 10 modules or reception noces.
Once this Doppler filtering is performed, a two-dimensio- nal (or 20: Fourier transformation of '10 x 10) points trans-, forms the plane of the (10 x 10 nodes) of the antenna in 0 x 0 simultaneous beams or reception channels.
This 2D-transformation must be performed in 10 us so tat a single 20-Fourier transforming circuit can compute in 1 ms the channels corresponding to the 100 Doppler shifts.
This two-dimensional Fourier transforming circuit can comprise, as shown in Figure 7 - a one-dimensional 10-points transforming circuit T1 cons ructed in so-called hardwired digital technology and operating at the rate of 100 nanoseconds per sample (10 MHzj, that is a 10-psint transformation performed in 1 us, followed bv - a 10 x 1u-loca'ion memory M used to wrte in row the 1D results of 10 @odes and to read them back in columns, followed by : - a second 10-point one-dimensional Fourier transforming circuit @2 identica to the first one.
The results from this 20 transformation art stored in a further memory M4 with 10,000 16-bit locations at the rate of 10 MHz, at an address that corresponds to the running num ber #j of the reception channel thus formed (from 1 to 100) and to the corresponding Doppler shift Fd 'from 1 to 100).
This storing operation completes the analog processing of the radar signal received during 1 ms.
detection step performed after a spatial normalization in each of the Doppler shift planes allows to extract the "target imagery", i.e., their angular positions and their radial velocities.
In order to sharpen the velocity measurement tnrough the measurement of the Doppler shift, we accumulate after detection the 16 amplitude and phase results obtained from the 16 pulses of the same frequency transmitted during the first sequence.
The 16 amplitude and phase results obtained 'from the second sequence allow then to compute the precise range of te targets as their velocity is known.
Claims (5)
1. A spectrum analyzer for n signals witn a bandwidth B and a duration T, including - means for analog-to-digital conversion o tne n signals to be analyzed, operating at a frequency nB, ana acting on all of the n signals to be analyzer, during a time T, through time-division multiplexing; - means for storing the digitized samples tnus obtained, defined both by their rank in a sequence of samples with a duration T relative to a signa ta be analyzed, and by the running number of this signal to be analyzed;; - means for addressing in writ ode and in read mode these storage means, allowing write operations at a frequency nB, in order of sample rank and, for a given sample rank, in order of running number of the signals to be analyzed and write operations, at a frequency 2nB, in order of running number of the signals to be analyzed ano, for a given running number of a signal to be analyzed, in crier of sample rank; - means for digital-to-analog conversion of the digitized samples thus read, operating at a frequency 2n; - an analog spectrum analyzer, wi a bandwidth 2nB, perfor- ming in succession a spectral analysis of said n signals, during a time T.
2. UtilIzation of a spectrum analyzer accorcing to claim for performing a Doppler filtering cn the signals from the group of radiating elements of : receiving antenna in a missile homing head of the type with separate and fixed trans mitting and receiving antennas, furthermore provided with a transmitting antenna with a relatively wide radiation pattern, transmitting a quasi-continuous wave, and means for the for- mation of beams associated with the receiving antenna and allowing instantaneous scanning of the airspace covered Dy the transmission beam.
3. A missile homing head according to clam 2, wherein tne means for the formation of beams Include a tno-dimensional Fourier t. ansformation circuit including in its turn - a first one-dimensional Fourier transforming circuit, with n1 points (with n = n1 x n2), acting on n1 samples from said spectrum analyzer, relative to one and the same Doppler shift, and operating at a frequency nB; - a memory with n1 x n2 storage locations used toSwrite in rows the results ror n1 points from said first Fourier transforming circuit, and to read them back in columns; - a second one-dimensional Fourier transforming circuit, wit n2 points, operating on the samples thus read in said memory and also operating at a frequency nB.
4. A spectrum analyzer for n signals with a bandwidth B and a duration T, substantially as described hereinbefore with reference to the accompanying drawings and as illustrated in Figure 5 of those drawings.
5. An antenna included in a missile homing head and substantially as described hereinbefore with reference to and as illustrated in the accompanying drawings.
5. A missile homing head substantially as described hereinbefore with reference to and as illustrated in the accompanying drawings.
Amendments to the claims have been filed as follows
1. An antenna including transmitting means for transmitting a first signal having a duration T, receiving means for receiving said first signal comprising n reception modules,
each of said n reception modules delivering a second signal,
means for analog to digital conversion which make r digitized
samples of each of said n second signals during said duration each sample having a rank which indicates
its order of appearance, means for storing the r samples of
the n reception modules rank after rank, means to effect the reading of the r stored samples which are associated with a particular reception module, the reading being effected successively for all modules, the reading being made 2 r times faster than the storage, means for digital-to-analog conversion of the digitized samples thus read and an analog spectrum analyser performing in succession a spectral analysis of said n signals during said duration T.
2. Utilization of the antenna claimed in Claim 1, for performing a Doppler filtering on the signals from the group of elements of a receiving antenna in a missile homing head of the type with separate and fixed trans mitting and receiving antennas, furthermore provided with a transmitting antenna with a relatively wide radiation pattern, transmitting a quasi-continuous wave, and means for the for- mation of beams associated with trite receiving antenna and allowing instantaneous scanning of the airspace covered by the transmission beam.
3. An antenna as claimed in claim 2, wherein the means for the formation of seams include a two-dimensional
Fourier transformation circuit including in its turn - a first one-dimensional Fourier transforming circuit, with n1 points (with n = n1 x n2), acting on n1 samples from said spectrum analyzer, relative t; one and the same Doppler shift, and operating at a frequency nB; - a memory with n 1 x n2 storage locations used to write in rows the results for n1 points from said first Fourier trans forming circuit, and to read them jack in columns: - a second one-cimensional Fourier transforming circuit wit n9 points, operating on the samples tnus read in said memory ana also operating at a frequency nB.
4. An antenna including a spectrum analyzer for n signals with a bandwidth B and a duration T, substantially as described hereinbefore with reference to the accompanying drawings and as illustrated in Figure 5 of those drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8616667A FR2714735B1 (en) | 1986-11-28 | 1986-11-28 | Spectrum analyzer and its application to a missile seeker of the type with separate and fixed transmit and receive antennas. |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8727800D0 GB8727800D0 (en) | 1995-11-01 |
| GB2290876A true GB2290876A (en) | 1996-01-10 |
| GB2290876B GB2290876B (en) | 1996-05-08 |
Family
ID=9341360
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8727800A Expired - Fee Related GB2290876B (en) | 1986-11-28 | 1987-11-27 | Antenna capable of performing a spectral analysis of signals |
Country Status (4)
| Country | Link |
|---|---|
| DE (1) | DE3740232A1 (en) |
| FR (1) | FR2714735B1 (en) |
| GB (1) | GB2290876B (en) |
| IT (1) | IT8748653A0 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10346047A1 (en) * | 2003-10-02 | 2005-04-28 | Eads Deutschland Gmbh | Method and device according to the FMCW radar principle |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1113022A (en) * | 1964-12-14 | 1968-05-08 | Int Standard Electric Corp | Improvements to pulse-doppler radars |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2205668B1 (en) * | 1972-11-07 | 1981-04-10 | Thomson Csf | |
| DE2514868C3 (en) * | 1975-04-04 | 1979-05-17 | Standard Elektrik Lorenz Ag, 7000 Stuttgart | FM beat-back reflector locator for simultaneous distance and speed measurement |
| US4620192A (en) * | 1983-09-29 | 1986-10-28 | Raytheon Company | Continuous wave radar with ranging capability |
-
1986
- 1986-11-28 FR FR8616667A patent/FR2714735B1/en not_active Expired - Fee Related
-
1987
- 1987-11-27 GB GB8727800A patent/GB2290876B/en not_active Expired - Fee Related
- 1987-11-27 DE DE19873740232 patent/DE3740232A1/en not_active Ceased
- 1987-11-30 IT IT8748653A patent/IT8748653A0/en unknown
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1113022A (en) * | 1964-12-14 | 1968-05-08 | Int Standard Electric Corp | Improvements to pulse-doppler radars |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2290876B (en) | 1996-05-08 |
| GB8727800D0 (en) | 1995-11-01 |
| IT8748653A0 (en) | 1987-11-30 |
| DE3740232A1 (en) | 1995-10-05 |
| FR2714735B1 (en) | 1996-04-12 |
| FR2714735A1 (en) | 1995-07-07 |
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| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19960808 |