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    • 1. 发明申请
    • SCANNING RF RECEIVER
    • 扫描RF接收机
    • WO01086810A1
    • 2001-11-15
    • PCT/GB2001/001845
    • 2001-04-25
    • H03J7/32G01R23/16
    • H03J7/32
    • A receiver for analysing input RF signals comprises a first stage (51-55a) which includes an input for receiving one or more RF signals for analysis and a first local oscillator (51) having an output comprising a first plurality of frequencies. The input is mixed with the local oscillator output in a first mixer (55a) to generate a first intermediate frequency spectrum output. A second stage (56-59) includes a second local oscillator (58) adapted to produce as output a sweep signal traversing a second plurality of frequencies and a second mixer (55b) for combining said second local oscillator output with said first intermediate frequency output to generate a second intermediate frequency output.
    • 用于分析输入RF信号的接收机包括第一级(51-55a),其包括用于接收用于分析的一个或多个RF信号的输入端和具有包括第一多个频率的输出的第一本地振荡器(51)。 输入与第一混频器(55a)中的本地振荡器输出混合以产生第一中频频谱输出。 第二级(56-59)包括适于产生穿过第二多个频率的扫描信号作为输出的第二本地振荡器(58)和用于将所述第二本机振荡器输出与所述第一中频输出组合的第二混频器(55b) 以产生第二中频输出。
    • 3. 发明公开
    • Signal type identification
    • 信号类型标识
    • EP1161043A3
    • 2003-09-17
    • EP01304010.0
    • 2001-05-02
    • Tektronix, Inc.
    • Deshpande, NikhilHill, Thomas C.Jenkins, EbenEngholm, Kathryn A.
    • H04L27/00H04B1/40G01R23/16H03J7/32
    • H04L27/0012
    • A method of identifying a signal type uses parameters of the signal as a basis for automatic identification. A signal of interest is selected from a display of a spectral waveform for a specified frequency An occupied bandwidth for the signal of interest is estimated and, if the occupied bandwidth is common to more than one known signal type, a complementary cumulative distribution function of peak power for the signal of interest is estimated. The signal type may be identified as a function of these parameters.. Additionally the frequency of the signal of interest may be compared with a database of spectral assignments for known signal types to provide further information about the signal of interest.
    • 识别信号类型的方法使用信号的参数作为自动识别的基础。 从指定频率的频谱波形的显示中选择感兴趣的信号。估计感兴趣的信号的占用带宽,并且如果占用带宽对于多于一种已知信号类型是共同的,则峰值的互补累积分布函数 估计感兴趣的信号的功率。 信号类型可以被识别为这些参数的函数。另外,感兴趣的信号的频率可以与已知信号类型的谱分配的数据库进行比较,以提供关于感兴趣的信号的进一步的信息。
    • 4. 发明公开
    • Signal receiving arrangement
    • 信号Empfangsanordnung。
    • EP0322024A2
    • 1989-06-28
    • EP88202849.1
    • 1988-12-13
    • THORN EMI Electronics Limited
    • Dadds, Alan Frederick
    • H03D7/16H03J7/32G01R23/14
    • G01R23/14H03D7/00H03D7/165
    • A signal receiving arrangement comprising first and second groups (14, 16) of frequency down-converting stages (18 to 24 and 26 to 34), each stage including a mixer (40) and a local oscillator (42) for frequency down-converting a signal applied to the stages (18 to 24 and 26 to 34), the local oscillator frequencies of successive stages (18 to 24 and 26 to 34) being progressively higher with the frequency differences between correspondingly numbered stages in each group forming an arithmetic progression, wherein the frequency down-converted outputs of the stages of each group are combined and the pair of residue frequencies formed by mixing down the input signal are used to determine on the basis of the Chinese remainder theorem which stage in each group was operative on the input signal and thereby ascertain the actual frequency of the input signal.
    • 一种信号接收装置,包括降频转换级(18至24和26至34)的第一组和第二组(14,16),每个级包括用于频率下变频的混频器(40)和本地振荡器(42) 施加到级(18至24和26至34)的信号,连续级(18至24和26至34)的本地振荡器频率逐渐变高,每组中相应编号的级之间的频率差形成算术级数 其中,组合各组的各级的下变频输出,并且使用通过混合输入信号形成的一对残差频率来确定基于中国剩余定理,每组中的哪个阶段在 输入信号,从而确定输入信号的实际频率。
    • 5. 发明公开
    • Procédé et dispositif pour la détection automatique d'émissions radioélectriques de signaux
    • Verfahren und Anordnung zur automatischen Detektion von Funksendungen。
    • EP0311504A1
    • 1989-04-12
    • EP88402503.2
    • 1988-10-04
    • THOMSON-CSF
    • Bensadou, Jean-Claude
    • H03J7/32
    • H03J7/32
    • Le procédé consiste à fixer automatiquement un seuil de détection des signaux radioélectriques. Ce seuil est fixé en fonction d'une estimation en temps réel de la valeur moyenne de la puissance de bruit atmosphérique. L'estimation de la valeur du bruit s'effectue en prélevant (5) des échantillons de bruit et/ou de signal utile appliqués à l'entrée du récepteur, en discriminant (6) les échantillons de bruit des échantillons de signal utile et en calculant (7) une valeur moyenne des échantil­lons de bruit sur un nombre déterminé N d'échantillons. Le seuil de détection est ensuite déterminé par la probabilité pour que l'amplitude instantanée du bruit présent à un instant donné à l'entrée du récepteur ne dépasse pas d'un nombre déterminé de décibels la valeur moyenne des échantillons de bruit calculés.
      Application : Récepteurs de radiosurveillance.
    • 该过程包括自动固定检测无线电信号的阈值。 该阈值作为大气噪声功率的平均值的实时估计的函数而被固定。 通过将(5)应用于接收机的输入的噪声和/或有用信号样本通过区分(6)噪声样本与有用信号样本并通过计算(7)来估计噪声的值, 噪声样本在指定数量N个样本上的平均值。 检测阈值然后由接收机输入端的给定时刻存在的噪声的瞬时振幅不超过计算噪声样本的平均值的指定数目的分贝的概率来确定。 应用:无线电监控接收机。
    • 7. 发明公开
    • Funkempfangseinrichtung
    • Funkempfangseinrichtung。
    • EP0081172A1
    • 1983-06-15
    • EP82110988.1
    • 1982-11-27
    • Rohde & Schwarz GmbH & Co. KG
    • Knirsch, Herbert
    • H04K3/00H03J7/32
    • G01R23/18H03J7/32
    • Zum Empfang von auf aperiodisch schnell wechselnden Frequenzkanälen sendenden Nachrichtensendern (1) wird ein Filterbankempfänger (3) mit einer Vielzahl von das Betriebsfrequenzband des Senders (1) in eine Vielzahl von aneinander anschliessende schmale Empfangskanäle aufteilenden Filtern (K1 bis Kn) vorgesehen wobei die Ausgänge der einzelnen Filter (K1 bis Kn) über Gleichrichter (7) mit Speicherkondensatoren (8) verbunden sind, zur Echtzeitdarstellung der vom Sender (1) benutzten Frequenzkanäle als Spektrum auf dem Bildschirm einer Anzeigeeinrichtung (11) diese Speicherkondensatoren (8) über eine mit der Anzeigeeinrichtung (11) verbundene Abtastschaltung (9) nacheinander abtastbar sind und über den Ausgängen der einzelnen Filter (K1 bis Kn) zugeordnete Schalter (S1 bis Sn) die durch die Bildschirmauswertung jeweils als interessant festgestellten Filter zur weiteren Verarbeitung der Filterausgangssignale auswählbar sind.
    • 1.一种具有滤波器组接收器(3)的无线电接收装置,其滤波器输出由采样开关(9)周期性地抽头,用于在显示屏幕(阴极射线管11)上实时表示所接收的频谱 ),其特征在于,为了处理发送具有快速且非周期性变化的频率(即采用跳频)的发射机的信号,各个滤波器(K1至Kn)的输出通过单独的开关(S1至Sn)与 信号处理电路(13,14,15,16),使得通过这些开关可以选择在显示屏幕(11)上被识别为属于同一个发送器的那些频率。
    • 8. 发明公开
    • RADIO SCANNER AND DISPLAY SYSTEM
    • 搜索接收及显示设备
    • EP0783810A4
    • 2001-03-07
    • EP94931265
    • 1994-08-04
    • EMERSON HARRY EDWIN
    • EMERSON HARRY EDWIN
    • H03J1/00H03J1/04H03J7/32H04B17/00H04B17/02
    • H03J7/32H03J1/0066H03J1/0083H03J1/047H04B17/23H04B17/318
    • A method is described for operating a radio receiver (4, 12) in such a manner as to accurately and rapidly identify unlistenable, very listenable and marginally listenable channels, and display the listenable and very listenable channels along with an indication of their signal strength, noise and quality on a screen (44). A reference value of automatic fine tuning voltage is found for the particular receiver. Capacitors (24, 26) that are charged in accordance with the levels of signal strength, noise and automatic fine tuning voltages are sampled before being fully charged at each channel change, and averages of the respective samples are computed as well as the offset between the average of the automatic fine tuning samples and the reference value of automatic fine tuning voltage. A channel having sample averages not meeting certain criteria is rejected as unlistenable, and, of the others, a channel having a very low average on its noise capacitor is identified as very listenable. Those of the remaining channels that are at least marginally listenable are identified by similar analysis of a second group of samples. The criteria for signal strengths and noise may be varied with ambient temperature, and the criteria for noise can be adjusted on the basis of the noisiest channel or the noise produced when the antenna (2) is grounded. Those channels having the greatest signal strength are associated with tuning buttons (42), and indications of these associations are made on the screen.