SE542788C2 - Method for increasing the instantaneous bandwidth of a digital receiver system with frequency coding - Google Patents
Method for increasing the instantaneous bandwidth of a digital receiver system with frequency codingInfo
- Publication number
- SE542788C2 SE542788C2 SE1800093A SE1800093A SE542788C2 SE 542788 C2 SE542788 C2 SE 542788C2 SE 1800093 A SE1800093 A SE 1800093A SE 1800093 A SE1800093 A SE 1800093A SE 542788 C2 SE542788 C2 SE 542788C2
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- Prior art keywords
- frequency
- signal
- signals
- channel
- frequency channel
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/02—Channels characterised by the type of signal
- H04L5/06—Channels characterised by the type of signal the signals being represented by different frequencies
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- 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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/021—Auxiliary means for detecting or identifying radar signals or the like, e.g. radar jamming signals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
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- 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
- G01S13/88—Radar or analogous systems specially adapted for specific applications
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- 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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/28—Details of pulse systems
- G01S7/285—Receivers
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- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- General Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Electromagnetism (AREA)
- Radar Systems Or Details Thereof (AREA)
- Superheterodyne Receivers (AREA)
Abstract
SammanfattningUppfinningen utgör en metod för att med hjälp av frekvenskodning göra ett mottaga rsystem momentant bredbandigt trots att ingående digitalmottagare har begränsad bandbredd. Inkommande signaler delas upp i analoga frekvenskanaler (SI) och signalen i varje frekvenskanal splittas i två (S2, S3).Lokaloscillatorer (O1, O2, O3, O4) och blandare (M1, M2, M3, M4) används för att konvertera signalerna till en mellanfrekvens som kan samplas av en analog- digitalomvandlare (ADC) och därefter frekvensbestämmas i signalbehandling. Efter konvertering med olika lokaloscillatorfrekvenser summeras signalerna i varje frekvenskanal (C1, C2). Varje inkommande signal kommer konverteras till att bestå av ett frekvenspar. Varje frekvenskanal har dock en unik skillnadsfrekvens mellan dess oscillatorer. Alla signaler från frekvenskanalerna sammanlagras (C_1). Genom att mäta den momentana frekvensskillnaden mellan detekterade signaler kan signalbehandlingen bestämma vilken frekvenskanal signalen härrör ifrån. Metoden fungerar även med flera samtidigt inkommande signaler i samma eller olika frekvenskanaler.Summary The invention constitutes a method for using frequency coding to make a receiver system momentarily broadband despite the fact that the incoming digital receivers have limited bandwidth. Incoming signals are divided into analog frequency channels (SI) and the signal in each frequency channel is split into two (S2, S3). Local oscillators (O1, O2, O3, O4) and mixers (M1, M2, M3, M4) are used to convert the signals to an intermediate frequency that can be sampled by an analog-to-digital converter (ADC) and then frequency-determined in signal processing. After conversion with different local oscillator frequencies, the signals are summed in each frequency channel (C1, C2). Each incoming signal will be converted to consist of a frequency pair. However, each frequency channel has a unique difference frequency between its oscillators. All signals from the frequency channels are stored together (C_1). By measuring the instantaneous frequency difference between detected signals, the signal processing can determine which frequency channel the signal originates from. The method also works with several simultaneously incoming signals in the same or different frequency channels.
Description
Metod för att med frekvenskodning öka den momentana bandbredden i ett digitalmottagarsystem Allmän beskrivning och känd teknik Uppfinningen utgör en metod för att betydligt reducera hårdvara i bredbandiga signalspaningssystem med digitala mottagare. Method to increase the instantaneous bandwidth of a digital receiver system with frequency coding General description and prior art The invention constitutes a method for significantly reducing hardware in broadband signal reconnaissance systems with digital receivers.
Signalspaning mot radar används för att karakterisera olika radarsändningar för att varna för annalkande hot (radarvarningsfunktion) eller för att bilda en taktisk lägesbild rörande omgivande emittrar (taktisk signalspaning). Signalspaning kan också användas i underrättelsesyfte för att skapa databasunderlag för olika radarsystem (sk. ELINT). Radar signal reconnaissance is used to characterize different radar transmissions to warn of impending threats (radar warning function) or to form a tactical picture of the surrounding emitters (tactical signal reconnaissance). Signal reconnaissance can also be used for intelligence purposes to create database data for various radar systems (so-called ELINT).
Det är ofta viktigt att signalspaningssystemet är "vidöppet" d.v.s. spanar inom hela det avsedda frekvensområdet samt rymdtäckningsområdet momentant. Detta för att inte missa signaler som kan utgöra ett hot. Det finns olika typer av mottagararkitekturer som stödjer detta men den vanligaste är den sk. IFM-mottagaren vilken i grunden är en analog mottagare som kan ges stor momentan bandbredd. IFM-mottagaren är dock behäftad med ett antal svagheter och två av dessa är: 1. IFM-mottagaren kan inte resolvera tidsöverlappande signaler på olika frekvenser. Förekomst av flera samtidiga signaler ger mätfel och indikation på endast en signal. 2. IFM-mottagaren får begränsningar i känslighet som dimensioneras av bottenbrusnivå som bestäms av RF-bandbredd tillsammans med videobandbredd enligt: Image available on "Original document" Där BB är ekvivalent brusbandbredd, BHF är RF-bandbredd och Bv är videobandbredd efter signaldetektorn. Bottenbruset vid rumstemperatur brukar anges till -114 dBm/MFIz och ovanstående formel ger som exempel ett bottenbrus på -85 dBm vid 16 GHz RF-bandbredd och 20 MHz videobandbredd. Med mottagarens brusfaktor adderad samt den signalbrus-marginal som behövs för signaldetektion hamnar känsligheten på typiskt -65 dBm. It is often important that the signal reconnaissance system is "wide open", i.e. scans within the entire intended frequency range as well as the space coverage area momentarily. This is so as not to miss signals that could pose a threat. There are different types of receiver architectures that support this but the most common is the so-called. The IFM receiver which is basically an analog receiver that can be given large instantaneous bandwidth. However, the IFM receiver has a number of weaknesses and two of these are: 1. The IFM receiver cannot resolve time-overlapping signals at different frequencies. The presence of several simultaneous signals gives measurement errors and an indication of only one signal. The IFM receiver has limitations in sensitivity dimensioned by bottom noise level determined by RF bandwidth together with video bandwidth according to: Image available on "Original document" Where BB is equivalent noise bandwidth, BHF is RF bandwidth and Bv is video bandwidth after the signal detector. The bottom noise at room temperature is usually set to -114 dBm / MFIz and the above formula gives as an example a bottom noise of -85 dBm at 16 GHz RF bandwidth and 20 MHz video bandwidth. With the receiver's noise factor added and the signal noise margin needed for signal detection, the sensitivity typically ends up at -65 dBm.
På senare år har den snabba utvecklingen av högpresterande AD-omvandlare gjort att marknaden försöker omsätta IFM-baserade system med digitalteknikbaserade mottagare för att bl. a. frångå ovanstående problem men även p.g.a. andra fördelar som miniatyrisering. Ett digitalmottagarsystem består av analog RF-del som filtrerar och frekvenskonverterar inkommande signaler för att de ska bli lämpliga för sampling (d.v.s. sampling sker inte direkt på RF utan en lägre mellanfrekvens). In recent years, the rapid development of high-performance AD converters has led the market to try to implement IFM-based systems with digital technology-based receivers in order to e.g. a. depart from the above problems but also p.g.a. other benefits such as miniaturization. A digital receiver system consists of analog RF part that filters and frequency converts incoming signals to make them suitable for sampling (i.e. sampling does not take place directly on RF but a lower intermediate frequency).
Digitalmottagare kan göras överlägsna en IFM-mottagare avseende mätprecision för radarparametrar, känslighet och hantering av tidsöverlappande signaler. Det senare är viktigt då civil kommunikationstrafik, typiskt mobilbasstationer, ökar i omfattning och kryper upp i frekvens och idag finns inom banden aktuella för radarsignalspaning. Digital receivers can be made superior to an IFM receiver in terms of measurement accuracy for radar parameters, sensitivity and handling of time-overlapping signals. The latter is important as civilian communication traffic, typically mobile base stations, is increasing in scope and creeping up in frequency and today is within the bands relevant for radar signal reconnaissance.
Problemet med digitalmottagare är att kostnadseffektivt skapa momentan frekvenstäckning över hela det aktuella signalspaningsbandet, typiskt 2-18 GHz. Dessutom vill man ofta momentant (d.v.s. utan att använda en svepande reflektorantenn) mäta signalens ankomstriktning varför ett antal parallella mottagare behövs för att genom amplitud- eller fasjämförelse (eller kombinationer därav) skatta signalens ankomstriktning. Då den momentana digitalmottagarbandbredden idag är begränsad till ett antal GHz krävs ett mycket stort antal digitalmottagare för att täcka hela området i frekvens- och rymd med samtidig riktningsmätning. Ett exempel kan utgöras av ett 6-kanaligt system med 4 GHz breda digitalmottagare. Erforderligt antal mottagare för ett komplett momentant spanande system blir 24 st. mottagare (4 frekvenskanaler x 6 kompletta mottagare) för täckning 2-18 GHz. Detta är mycket kostnadsdrivande. The problem with digital receivers is to cost-effectively create instantaneous frequency coverage over the entire current signal reconnaissance band, typically 2-18 GHz. In addition, one often wants to momentarily (i.e. without using a sweeping reflector antenna) measure the direction of arrival of the signal, so a number of parallel receivers are needed to estimate the direction of arrival of the signal by amplitude or phase comparison (or combinations thereof). As the instantaneous digital receiver bandwidth today is limited to a number of GHz, a very large number of digital receivers is required to cover the entire area in frequency and space with simultaneous directional measurement. An example could be a 6-channel system with 4 GHz wide digital receivers. The required number of receivers for a complete instantaneous reconnaissance system will be 24. receivers (4 frequency channels x 6 complete receivers) for coverage 2-18 GHz. This is very costly.
Det finns patenterade metoder för att reducera antalet digitalmottagare i ett bredbandigt system. En sådan metod (US6031869A) använder flera undersamplande mottagare som nyttjar olika samplingsfrekvens. Härvidlag kan sann frekvens bestämmas. Nackdelen här är att flera mottagare behövs. There are patented methods for reducing the number of digital receivers in a broadband system. One such method (US6031869A) uses several subsampling receivers that utilize different sampling frequencies. In this respect, true frequency can be determined. The disadvantage here is that more receivers are needed.
Figurbeskrivning Figur 1 beskriver uppfinningens princip. Description of the figures Figure 1 describes the principle of the invention.
Figur 2 beskriver flöde för signalbehandling Specifik beskrivning Föreliggande uppfinning reducerar antalet digitalmottagare markant utan avgörande prestandasänkning. Detta görs genom analog frekvenskanalisering och frekvenskodning av signaler i varje frekvenskanal åtföljt av sampling i en digitalmottagare. Exempelvis kan en digitalmottagare täckande strax över 4 GHz användas för momentan mottagning över hela bandet 2-18 GHz. I exemplet med 6-kanalssystem kan erforderligt antal digitalmottagare således reduceras med en faktor 4. Frekvenskodningen i varje frekvenskanal är uppfinningens nyckelfunktion. Denna gör så alla signaler kan blandas ner till ett smalare band än vad det totala systemet täcker utan att förlora upptäckssannolikhet för signaler (momentan täckning). Signaler i varje frekvenskanal frekvenskodas automatiskt olika varför efterföljande signalbehandling kan identifiera vilken frekvenskanal signal härstammar ifrån genom att mäta den momentana frekvensskillnaden mellan frekvenskomponenter. Eftersom lokaloscillatorfrekvenser i systemet är kända kan signalbehandlingen extrahera sann absolutfrekvens. Uppfinningen är en del i ett komplett signalspaningssystem men övrig teknik i signalspaningssystemkonstruktion är känd av fackmannen. En helhetsbeskrivning ges dock i detta dokument för att sätta in uppfinningen i sitt sammanhang. Figure 2 describes flow for signal processing Specific description The present invention significantly reduces the number of digital receivers without decisive performance reduction. This is done by analog frequency channeling and frequency coding of signals in each frequency channel accompanied by sampling in a digital receiver. For example, a digital receiver covering just over 4 GHz can be used for instantaneous reception over the entire 2-18 GHz band. Thus, in the example of a 6-channel system, the required number of digital receivers can be reduced by a factor of 4. The frequency coding in each frequency channel is the key function of the invention. This allows all signals to be mixed down to a narrower band than the total system covers without losing the detection probability of signals (instantaneous coverage). Signals in each frequency channel are automatically frequency coded differently, which is why subsequent signal processing can identify which frequency channel signal originates from by measuring the instantaneous frequency difference between frequency components. Since local oscillator frequencies in the system are known, the signal processing can extract true absolute frequency. The invention is part of a complete signal reconnaissance system, but other techniques in signal reconnaissance system construction are known to those skilled in the art. However, a comprehensive description is given in this document to place the invention in its context.
En genomgång av signalkedjan med referens till figur 1 ges nedan. Figur 1 exemplifierar två frekvenskanaler i en fyrkanalsarkitektur: 1. Signalen tas emot från antenn Ant. 2. Signalen bandpassfiltreras i bredbandigt bandpassfilter BF1. 3. Signalen nivåanpassas vid behov via digitalt styrd dämpare Al. 4. Signalen förstärks i förförstärkare G1. A review of the signal chain with reference to Figure 1 is given below. Figure 1 exemplifies two frequency channels in a four-channel architecture: 1. The signal is received from antenna Ant. 2. The signal is bandpass filtered in broadband bandpass filter BF1. 3. The signal is level-adjusted if necessary via digitally controlled attenuator Al. 4. The signal is amplified in preamplifier G1.
. Signalen splittas upp i frekvenskanaler i splitter S1. 6. Signalen i varje frekvenskanal splittas upp i två grenar i splitter S2, S3... 7. Signalen i varje splittergren blandas med localoscillator O1, O2, O3, O4... Varje frekvenskanal har en unik frekvensskillnad mellan de två oscillatorerna. Oftast måste frekvenskonverteringen ske i flera steg (med flera oscillatorer) med anpassad filtrering i ett bredbandigt system. Metoder för signalren och bredbandig frekvenskonvertering är väl kända av fackmannen. Slutprodukten blir dock två signaler med en frekvensskillnad f1, f2... i varje frekvenskanal. 8. Signalerna från alla frekvenskanaler konverteras till ett och samma mellanfrekvensband för att möjliggöra bredbandig signalmottagning med endast en bandbreddsreducerad digitalmottagare. 9. Nivåanpassning med flera förstärkare och eventuellt dämpare i varje frekvenskanal är inte inritat i figur lmen tillämpas av fackmannen för att nå erforderlig nivåanpassning mot blandare och AD-omvandlare ADC. . The signal is split into frequency channels in splitter S1. 6. The signal in each frequency channel is split into two branches in splitters S2, S3 ... 7. The signal in each splitter branch is mixed with local oscillator O1, O2, O3, O4 ... Each frequency channel has a unique frequency difference between the two oscillators. Most often, the frequency conversion must take place in several steps (with several oscillators) with custom filtering in a broadband system. Methods for signal purification and broadband frequency conversion are well known to those skilled in the art. However, the end product will be two signals with a frequency difference f1, f2 ... in each frequency channel. 8. The signals from all frequency channels are converted into one and the same intermediate frequency band to enable broadband signal reception with only one bandwidth-reduced digital receiver. 9. Level adjustment with several amplifiers and possibly attenuators in each frequency channel is not drawn in the figure lmen applied by the person skilled in the art to achieve the required level adjustment to mixer and AD converter ADC.
. De två signalerna i varje frekvenskanal summeras i kombinerare C1, C2... 11. Signalerna från alla frekvenskanaler summeras i kombinerare C_1. 12. Signalerna samplas och kvantiseras i AD-omvandlare ADC. Företrädesvis används komplex sampling vilket ger ett kvadraturpar, I och Q, som bestämmer belopp och fas för varje signalsampel. 13. När signal detekterats och kanalbestämts i en snabb frekvensskattningsfunktion (som Fast Fourier Transform) kopplas digitala data till en smalbandig mätkanal för parameterskattning. Mätning av ankomsttid och pulslängd görs företrädesvis i tidsplanet på konventionellt sätt. Mätning av noggrann frekvens, amplitud och modulation på signalen görs lämpligen i frekvensplanet. Metoder för parameterskattning är känd av fackmannen. 14. Signalerna signalbehandlas för att extrahera emitterparametrar, emittrar och genomföra signalidentifiering mot signaldatabas. . The two signals in each frequency channel are summed in combiner C1, C2 ... 11. The signals from all frequency channels are summed in combiner C_1. 12. The signals are sampled and quantized in AD converter ADC. Preferably, complex sampling is used, which gives a quadrature pair, I and Q, which determines the amount and phase of each signal sample. 13. When signal is detected and channel determined in a fast frequency estimation function (such as Fast Fourier Transform), digital data is connected to a narrowband measurement channel for parameter estimation. Measurement of arrival time and pulse length is preferably done in the schedule in a conventional manner. Measurement of accurate frequency, amplitude and modulation of the signal is suitably done in the frequency plane. Methods for parameter estimation are known to those skilled in the art. 14. The signals are signal processed to extract emitter parameters, emit and perform signal identification against signal database.
. Signalbehandlingen i ett komplett system tillgår enligt flöde i figur 2 med beskrivning enligt nedan. . The signal processing in a complete system is available according to the flow in figure 2 with a description as below.
A. Frekvensinnehåll i mottaget spektra skattas via snabb Fouriertransform (FFT) eller motsvarande algoritm. Flera parallella frekvensskattningsfunktioner med olika beräkningslängd kan nyttjas för att skapa en viss signalanpassad detektion. Längre beräkningssekvens medför smalare frekvenskanaler och därmed lägre brus i varje kanal. Längre beräkningssekvenser ger högre känslighet för längre pulslängder. Tröskling tillämpas för att sortera nyttosignaler från bottenbrus med en given falsklarmsrisk. A. Frequency content in received spectra is estimated via fast Fourier transform (FFT) or equivalent algorithm. Several parallel frequency estimation functions with different calculation lengths can be used to create a certain signal-adapted detection. Longer calculation sequence results in narrower frequency channels and thus lower noise in each channel. Longer calculation sequences give higher sensitivity for longer pulse lengths. Threshold is applied to sort utility signals from bottom noise with a given false alarm risk.
B. Frekvensavstånd mellan signaltoppar extraheras och matchas med förväntade frekvensavstånd för varje frekvenskanal. B. Frequency distances between signal peaks are extracted and matched with expected frequency distances for each frequency channel.
C. När frekvensavstånd extraherats kan absolutfrekvensen räknas ut med hänsyn till lokaloscillatorfrekvenserna i, för frekvensavståndet, aktuell frekvenskanal. C. When frequency range is extracted, the absolute frequency can be calculated with respect to the local oscillator frequencies in, for the frequency range, the current frequency channel.
D. En av tonerna hörande till ett frekvenspar isoleras i en digital smalbandskanal som föregås av lämplig fördröjning för att inte missa signalinnehåll. D. One of the tones belonging to a frequency pair is isolated in a digital narrowband channel which is preceded by an appropriate delay so as not to miss signal content.
E. I den digitala smalbandskanalen mäts tidsparametrar som ankomsttid och pulslängd men även parametrar som noggrann frekvens, modulation på puls och amplitud. Metoder för dessa typer av mätningar är kända av fackmannen. E. In the digital narrowband channel, time parameters such as arrival time and pulse length are measured, but also parameters such as accurate frequency, modulation of pulse and amplitude. Methods for these types of measurements are known to those skilled in the art.
F. När signalparametrar har mätts upp skapas ett sk. signaldeskriptorord som sammantaget innehåller alla karakteristika hörande till en signal. Metoder för bildande av signaldeskriptorord är känt av fackmannen. F. When signal parameters have been measured, a so-called signal descriptor words which together contain all the characteristics belonging to a signal. Methods for generating signal descriptor words are known to those skilled in the art.
G. När signaldeskriptorord har skapats sorteras signaler i fack för att sortera vilka pulser som härrör från samma sändare. För pulser beräknas sedan pulsrepetitionsintervall för signalen. G. Once signal descriptor words have been created, signals are sorted in bins to sort which pulses originate from the same transmitter. For pulses, the pulse repetition interval for the signal is then calculated.
Signalsorteringsprocesser är kända för fackmannen. Signal sorting processes are known to those skilled in the art.
H. När signalsortering och beräkning av pulsrepetitionsintervaller skett matchas all tillgänglig signaldata mot data i en signaldatabas för att försöka identifiera den aktiva emittern för att presentera en känd emitterbeteckning för operatör. Processen för signalidentifiering är känd av fackmannen. H. When signal sorting and calculation of pulse repetition intervals has taken place, all available signal data is matched against data in a signal database to try to identify the active emitter to present a known emitter designation to the operator. The process of signal identification is known to those skilled in the art.
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SE1800093A SE542788C2 (en) | 2018-05-11 | 2018-05-11 | Method for increasing the instantaneous bandwidth of a digital receiver system with frequency coding |
PCT/SE2019/050419 WO2019216819A1 (en) | 2018-05-11 | 2019-05-11 | Method to increase the bandwidth in a digital receiver system by the use of frequency coding |
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WO2021091444A1 (en) * | 2019-11-08 | 2021-05-14 | Ew Labs Ab | Method to increase the bandwidth in a digital receiver system by the use of frequency coding |
SE544648C2 (en) * | 2020-09-08 | 2022-10-04 | Anders Widman | Method to double the bandwidth in a digital receiver system by the use of frequency and amplitude coding |
SE544242C2 (en) * | 2020-09-08 | 2022-03-15 | Anders Widman | Method to double the effective bandwith in a digital receiver system |
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GB2234874B (en) * | 1981-08-17 | 1991-06-26 | Philips Electronic Associated | Electronic surveillance systems. |
GB2160686B (en) * | 1984-06-22 | 1987-06-10 | Stc Plc | Identification of ships |
US5493306A (en) * | 1987-08-28 | 1996-02-20 | Eaton Corporation | Phased array antenna system to produce wide-open coverage of a wide angular section with high directive gain and moderate capability to resolve multiple signals |
NO20032897D0 (en) * | 2003-06-23 | 2003-06-23 | Ericsson Telefon Ab L M | Portable passive sensor |
US8805297B2 (en) * | 2012-10-16 | 2014-08-12 | Raytheon Company | Band stitching electronic circuits and techniques |
GB2518010A (en) * | 2013-09-09 | 2015-03-11 | Crfs Ltd | Frequency discriminator |
US9473158B1 (en) * | 2015-09-30 | 2016-10-18 | Lockheed Martin Corporation | Radio frequency receiver with overlapped analog to digital converter (ADC) architecture |
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