公开(公告)号：US3339143A

公开(公告)日：1967-08-29

申请号：US82778459

申请日：1959-07-17

Applicant: RALPH G LUCAS ,  NATHANIEL L LEEK ,  NAT SHAWMUT BANK

Inventor： LEON CHAFFEE EMORY

IPC: H03D3/26

CPC classification number: H03D3/26

公开(公告)号：US2994831A

公开(公告)日：1961-08-01

申请号：US83016659

申请日：1959-07-28

Applicant: GEORGE SCHOHAN

Inventor： GEORGE SCHOHAN

IPC: H03D3/26 ,  H03F9/04

CPC classification number: H03D3/26 ,  H03F9/04

公开(公告)号：US2671851A

公开(公告)日：1954-03-09

申请号：US27038852

申请日：1952-02-07

Applicant: GEN PRECISION LAB INC

Inventor： HOUCK JR GLADDEN B

IPC: H03D3/26

CPC classification number: H03D3/26

公开(公告)号：US2378819A

公开(公告)日：1945-06-19

申请号：US46676342

申请日：1942-11-24

Applicant: PHILCO RADIO & TELEVISION CORP

Inventor： ALBRIGHT ROBERT B

IPC: H03D3/08 ,  H03D3/26

CPC classification number: H03D3/26 ,  H03D3/08

公开(公告)号：US2323603A

公开(公告)日：1943-07-06

申请号：US40831941

申请日：1941-08-26

Applicant: RCA CORP

Inventor： SEYMOUR HUNT

IPC: H03D3/26

CPC classification number: H03D3/26

公开(公告)号：US09020072B2

公开(公告)日：2015-04-28

申请号：US14123232

申请日：2012-03-27

Applicant: Zuping Tang ,  Jiaolong Wei ,  Tao Yan

Inventor： Zuping Tang ,  Jiaolong Wei ,  Tao Yan

IPC: H03C3/00 ,  H04L27/32 ,  G01S19/02 ,  G01S19/37 ,  H04L27/20 ,  H04L23/02 ,  H04L25/03 ,  H03D3/26

CPC classification number: H04L27/32 ,  G01S19/02 ,  G01S19/37 ,  H03D3/26 ,  H04B2215/065 ,  H04L23/02 ,  H04L25/03 ,  H04L27/20

Abstract: The present invention provides a method for modulating a navigation signal, comprising: multiplying a data channel difference signal between upper and lower sidebands by a sine binary subcarrier to obtain an odd timeslot baseband signal of a branch Q, and multiplying a data channel sum signal of the upper and lower sidebands by a cosine binary subcarrier to obtain an odd timeslot baseband signal of a branch I of the data channel; multiplying a pilot channel difference signal between the upper and lower sidebands by the sine binary subcarrier to obtain an even timeslot baseband signal of the branch Q, and multiplying a pilot channel sum signal of the upper and lower sidebands by the cosine binary subcarrier to obtain an even timeslot baseband signal of the branch I; and performing QPSK modulation on the baseband signals of the branch I and branch Q to obtain a TD-AltBOC modulation signal. The present invention can implement transmission of different navigation services at two adjacent frequency bands, and each navigation service comprises a data channel and a pilot channel. The navigation signal of each sub-band may be received independently, or signals of the upper and lower sidebands may be jointly received to obtain high-precision navigation performance.

Abstract translation: 本发明提供了一种用于调制导航信号的方法，包括：将上，下边带之间的数据信道差信号乘以正弦二进制副载波，以获得分支Q的奇数时隙基带信号，并将 通过余弦二进制副载波上下边带获得数据信道的分支I的奇数时隙基带信号; 将上边带和下边带之间的导频信道差信号乘以正交二进制副载波，以获得分支Q的偶数时隙基带信号，并将上边带和下边带的导频信号和信号乘以余弦二进制副载波，以获得 分支I的时隙基带信号; 对分支I和分支Q的基带信号进行QPSK调制，得到TD-AltBOC调制信号。 本发明可以在两个相邻频带实现不同导航业务的传输，每个导航业务包括数据信道和导频信道。 可以独立地接收每个子带的导航信号，或者可以共同地接收上边带和下边带的信号以获得高精度的导航性能。

公开(公告)号：US4375618A

公开(公告)日：1983-03-01

申请号：US230197

申请日：1981-02-02

Applicant: William B. Jett, Jr.

Inventor： William B. Jett, Jr.

IPC: H03D3/18 ,  H03D3/14 ,  H03D3/26

CPC classification number: H03D3/18

Abstract: In an FM receiver a multiplier is driven from the IF limiter. The limiter also drives a single tuned circuit which produces a quadrature signal that drives a second port in the multiplier. When the quadrature signal is multiplied by the IF signal an FM detector results. The center frequency is determined by the frequency of the quadrature relationship and the extent of the resultant output curve is determined by the Q of the tuned circuit. The output response is linearized by varying the current in the multiplier as a function of the IF signal deviation.

Abstract translation: 在FM接收机中，乘法器由IF限幅器驱动。 限幅器还驱动单个调谐电路，其产生驱动乘法器中的第二端口的正交信号。 当正交信号乘以IF信号时，FM检测器结果。 中心频率由正交关系的频率决定，结果输出曲线的程度由调谐电路的Q决定。 通过根据IF信号偏差改变乘法器中的电流来将输出响应线性化。

公开(公告)号：US4359694A

公开(公告)日：1982-11-16

申请号：US156858

申请日：1980-06-04

Applicant: Kazuyuki Suenaga

Inventor： Kazuyuki Suenaga

IPC: H03D3/00 ,  H03D3/26

CPC classification number: H03D3/26

Abstract: An FM signal demodulating circuit comprises a peak differential type amplifier having two input terminals, a resonance circuit network connected between the two input terminals of the peak differential type amplifier, and a capacitor between the resonance circuit network and the ground. The resonance circuit network comprises a plurality of parallel resonance circuits which are connected in series and have respectively different parallel resonance frequencies. The demodulating circuit has a demodulating characteristic curve for demodulating FM signals having different carrier frequencies.

Abstract translation: FM信号解调电路包括具有两个输入端的峰值差分放大器，连接在峰值差分放大器的两个输入端之间的谐振电路网络和谐振电路网络与地之间的电容器。 谐振电路网络包括串联连接并具有分别不同的并联谐振频率的多个并联谐振电路。 解调电路具有用于解调具有不同载波频率的FM信号的解调特性曲线。

公开(公告)号：US4272726A

公开(公告)日：1981-06-09

申请号：US59469

申请日：1979-07-20

Applicant: Max E. Malchow

Inventor： Max E. Malchow

IPC: H03D3/14 ,  H03D3/26

CPC classification number: H03D3/26 ,  H03D3/14

Abstract: A balanced discriminator for frequency modulation systems particularly useful in integrated circuit applications. A source of FM signal having substantially zero source impedance drives a discriminator circuit-differential peak detector combination. The discriminator comprises first and second like capacitors connected between the FM source and first and second input connections to the differential peak detector respectively, an inductor connected between the input connections of the differential peak detector, and a third capacitor connected between said second input connection and a point of fixed potential.

Abstract translation: 用于频率调制系统的平衡鉴频器，在集成电路应用中特别有用。 具有基本上零源阻抗的FM信号源驱动鉴别器电路 - 差分峰值检测器组合。 鉴频器包括分别连接在FM源和分别与差分峰值检测器的第一和第二输入连接点之间的第一和第二类似电容器，连接在差分峰值检测器的输入连接之间的电感器和连接在所述第二输入连接和 一个固定的潜力点。

公开(公告)号：US4207597A

公开(公告)日：1980-06-10

申请号：US95551678

申请日：1978-10-30

Applicant: RCA CORP

Inventor： GIBSON WALTER G ,  LIU FRANK C

IPC: H03J7/02 ,  H03D3/26 ,  H03J7/04 ,  H03L7/02 ,  H04N5/50

CPC classification number: H03J7/04 ,  H03D3/26 ,  H03L7/02

Abstract: An automatic fine tuning (AFT) circuit is provided which generates an AFT control signal in response to a video intermedate frequency (I.F.) signal. The I.F. signal is supplied to the input of a current source amplifier, which provides current signals of like phase relationship to a discriminator network. The discriminator network is comprised of two tuned circuits, one of which is resonant at a frequency below the desired frequency of the I.F. picture carrier, and the other resonant at a frequency above the desired frequency. The tuned circuits develop voltage variations which vary differentially in magnitude in response to the frequency deviation of the I.F. picture carrier from its desired frequency. The differentially related voltages are detected by two peak detector networks for use as AFT control signals. The current source amplifier and peak detector networks may be conveniently fabricated on a single I.C. chip. The tuned circuits are coupled to the current source amplifier and peak detector networks through two external I.C. terminals.

Abstract translation: 提供了一种自动微调（AFT）电路，其响应于视频中间频率（I.F.）信号产生AFT控制信号。 I.F. 信号被提供给电流源放大器的输入，电流源放大器向鉴别器网络提供类似相位关系的电流信号。 鉴别器网络由两个调谐电路组成，其中一个调谐电路以低于I.F的期望频率的频率谐振。 图像载体，另一个以高于期望频率的频率谐振。 调谐电路产生响应于I.F.的频率偏差而在幅度上差异变化的电压变化。 图片载体从其所需的频率。 差分相关电压由两个峰值检测器网络检测，用作AFT控制信号。 电流源放大器和峰值检测器网络可以方便地在单个I C上制造。 芯片。 调谐电路通过两个外部I C耦合到电流源放大器和峰值检测器网络。 终端。