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1. 发明授权

US06473453B1 High data rate multiplexed multichannel high frequency broadcast system 失效
标题翻译：高数据速率复用多通道高频广播系统
公开(公告)号：US06473453B1
公开(公告)日：2002-10-29
申请号：US07953278
申请日：1992-09-30
申请人： Robert G. Wilkinson
发明人： Robert G. Wilkinson
IPC分类号： H04B1707
CPC分类号： H04B1/7102 , H04J13/004
摘要： A high frequency communications system comprises eight multiplexed (112) spread spectrum channels with data in each channel transmitted using, for example, 32 semi-orthogonal codes to enable 5 bits of data to be sent for every coded symbol transmitted. The multiplexed data is connected to a phase shift key (PSK) modulator (117) to modulate an hf carrier. At the receiver, inband interference is removed by frequency excision (92, 128) or weighting, making use of the facts that the interference is generally narrow-band and the spectrum of the frequency components of the received signal should be symmetrical about the carrier frequency. The detected signal is Fourier transformed by an FFT processor (91) and then connected to an interference exciser (92, 128) where signal samples symmetrical about the carrier frequency are compared and any sample which exceeds the respective symmetrical sample by more than a predetermined threshold is excised or given a low weighting. After interference excision the remaining signal is connected to a bank (1210) of 32 cross-correlation detectors before connection to a maximum likelihood detector and decoder (1213).
摘要翻译：高频通信系统包括8个多路复用（112）扩频信道，每个信道中的数据使用例如32个半正交码发送，以便每发送的编码符号发送5位数据。复用数据连接到相移键（PSK）调制器（117）以调制hf载波。在接收机中，通过频率切除（92,128）或加权来去除带内干扰，利用干扰通常是窄带的事实，并且接收信号的频率分量的频谱应当关于载波频率对称。所检测的信号由FFT处理器（91）进行傅立叶变换，然后连接到干扰去除器（92,128），其中将关于载波频率对称的信号样本与超过相应对称采样的任何样本相比超过预定阈值被切除或给予低加权。在干扰切除之后，剩余的信号在连接到最大似然检测器和解码器（1213）之前连接到32个互相关检测器的存储体（1210）。

2. 发明授权

US5218486A Correction of long term drift and short term fluctuating corruption of a signal 失效
标题翻译：纠正长期漂移和短期波动的信号腐败
公开(公告)号：US5218486A
公开(公告)日：1993-06-08
申请号：US543760
申请日：1990-07-17
申请人： Robert G. Wilkinson
发明人： Robert G. Wilkinson
IPC分类号： G11B20/02 , G11B15/52 , G11B20/22
CPC分类号： G11B20/225 , G11B15/52
摘要： An arrangement to remove drift and wow and flutter in a tape recording comprising recording a control signal tone derived from a reference clock (159) in a dedicated control channel or embedded in a signal channel. The control signal on playback (151) is compared to the reference signal in an up/down counter (172) and the difference is used to correct the speed of the tape drive. The drift corrected control tone signal is connected through a programmable RAM delay (154) and a latch (179) to a D/A converter (156). The delayed analogue control signal and the reference signal are limited then connected to phase comparator counter (158) which is triggered by the leading edge of the reference signal and read by the leading edge of the squared control signal to measure the time delay between them as a number of RAM (154) samples (N) and subsamples (n). The measured time delay is used to advance or retard the Read address (155) relative to the Write address in the RAM delay (154) where unit change in the tap address (N) is equal to 20 usec in the example. The remaining time delay (0-19) usec is connected to a phase delay circuit (178) effective to delay readout from the RAM via the latch (179) in one microsecond intervals in the example.
摘要翻译： PCT No.PCT / GB89 / 00087 Sec。 371日期1990年7月17日第 102（e）日期1990年7月17日PCT 1989年1月27日PCT PCT。出版物WO89 / 07314 日期：1989年8月10日。一种用于去除磁带录音中的漂移和抖动的装置，包括在专用控制信道中记录从参考时钟（159）导出的或嵌入在信号通道中的控制信号音。回放控制信号（151）与上/下计数器（172）中的参考信号进行比较，差值用于校正磁带驱动器的速度。漂移校正控制音信号通过可编程RAM延迟（154）和锁存器（179）连接到D / A转换器（156）。延迟的模拟控制信号和参考信号被限制，然后连接到由参考信号的前沿触发并由平方控制信号的前沿读取的相位比较器计数器（158），以测量它们之间的时间延迟多个RAM（154）样本（N）和子样本（n）。测量的时间延迟用于在RAM延迟（154）中相对于写入地址推进或延迟读取地址（155），其中抽头地址（N）中的单位变化等于20 usec。剩余时间延迟（0-19）usec连接到相位延迟电路（178），该相位延迟电路有效地在该示例中以一微秒的间隔经由锁存器（179）从RAM延迟读出。

3. 发明授权

US4606047A High frequency communications 失效
标题翻译：高频通信
公开(公告)号：US4606047A
公开(公告)日：1986-08-12
申请号：US432939
申请日：1982-09-28
申请人： Robert G. Wilkinson
发明人： Robert G. Wilkinson
IPC分类号： H04L1/02 , H04B1/10 , H04L20060101 , H04L1/00 , H04L1/20 , H04L27/02 , H04L27/30
CPC分类号： H04L1/20 , H04L1/0083 , H04L1/02 , H04L27/30
摘要： A slow speed hf communication modem employs frequency and time diversity to overcome transmission problems due to noise, multipath etc. A digitally encoded signal is transmitted consecutively on five complementary 2-tone channels distributed within the hf band. A unique start-of-message (SOM) signal is generated (9) to precede a message transmission and an end-of-message signal (EOM) follows the message. The SOM signal is detected (18) to produce an accurate timing pulse (20) which initiates a clock in the receiver modem (3) arranged to sample each channel tone at times appropriate to receiving message signals. The noise in each channel tone is also sampled before (pre-data bit) and after (post-data bit) a signal data bit and the measured pre-and post-data bits are combined to assign a weighting factor to the associated message data bits. By providing SOM and EOM signals the modem is able to operate unattended.
摘要翻译： PCT No.PCT / GB82 / 00025 Sec。 371日期1982年9月28日 102（e）1982年9月28日PCT PCT卷号1982年1月27日PCT公布。出版物WO82 / 02633 日期为1982年8月5日。慢速通信调制解调器采用频率和时间分集来克服由于噪声，多径等引起的传输问题。数字编码信号在分布在hf频带内的五个互补的2音频信道上连续传输。在消息传输之前生成唯一的消息（SOM）信号（9），消息结束信息（EOM）跟随消息。检测到SOM信号（18）以产生精确的定时脉冲（20），该定时脉冲启动接收机调制解调器（3）中的时钟，接收器调制解调器（3）被布置成在适于接收消息信号的时间采样每个信道音调。每个通道色调中的噪声也在（预数据位）之前和之后（后数据位）一个信号数据位进行采样，并且测量的前后数据位被组合以将加权因子分配给相关联的消息数据位。通过提供SOM和EOM信号，调制解调器能够无人值守地操作。

4. 发明授权

US4543657A Synchronizing of clocks 失效
标题翻译：时钟同步
公开(公告)号：US4543657A
公开(公告)日：1985-09-24
申请号：US380736
申请日：1982-05-12
申请人： Robert G. Wilkinson
发明人： Robert G. Wilkinson
IPC分类号： G04G7/02 , G04G9/00 , G04G7/00
CPC分类号： G04R20/22
摘要： A time clock modem transmitter comprises a pseudo-random number generator (PNG) which produces a time-spaced sequence of pseudo-random numbers such that each number uniquely represents the time of day. A transmitter PNG(11) capable of producing a polynomial sequence longer than 24 hours is reset every 24 hours by a transmitter reference clock (4). A receiver clock modem includes a receiver PNG(26) having the same polynomial characteristics as the transmitter PNG(11). A received signal number is fed into the receiver PNG and the PNG is then started. The output from the receiver PNG and the received signal are then compared to ensure correct synchronization of the receiver clock modem. A detector is provided which is responsive to the random number representing 2400 hours such that it produces a resetting output pulse at 2400 hours to reset a receiver reference clock. Clock pulse generators 19 and 28 are provided to rapidly advance by one cycle on actuation the reference clock and PNG respectively in the transmitter and the receiver for resetting the clocks.
摘要翻译： PCT No.PCT / GB81 / 00190 Sec。 371日期1982年5月12日 102（e）日期1982年5月12日PCT提交1981年9月15日PCT公布。出版物WO82 / 01088 日期为1982年4月1日。时钟调制解调器发射机包括伪随机数发生器（PNG），其产生伪随机数的时间间隔序列，使得每个数字唯一地表示一天中的时间。能够产生长于24小时的多项式序列的发射机PNG（11）由发射机参考时钟（4）每24小时复位。接收机时钟调制解调器包括具有与发射机PNG（11）相同的多项式特性的接收机PNG（26）。接收到的信号号码被馈送到接收机PNG，然后启动PNG。然后比较来自接收器PNG和接收信号的输出，以确保接收机时钟调制解调器的正确同步。提供一个响应于代表2400小时的随机数的检测器，使得它在2400小时产生复位输出脉冲以复位接收器参考时钟。提供时钟脉冲发生器19和28，用于在发射机和接收机中分别启动参考时钟和PNG以快速前进一个周期，以复位时钟。

5. 发明授权

US5230076A Ionospheric sounding 失效
标题翻译：离子声
公开(公告)号：US5230076A
公开(公告)日：1993-07-20
申请号：US807972
申请日：1985-10-29
申请人： Robert G. Wilkinson
发明人： Robert G. Wilkinson
IPC分类号： G01S13/02 , H04B17/00
CPC分类号： G01S13/0218 , H04B17/309
摘要： An ionospheric sounding system for frequency management of a HF communications system operates between a transmitter and a remote receiver and makes use of code-modulated narrow band sounding pulses transmitted at frequencies throughout the HF band. The code has an impulsive auto-correlation function and the frequency selection is pseudo-random. The code may be a two-part complementary code. Alternatively the code may be a selected one of a family of codes possessing high auto-correlation and low cross-correlation properties, thereby enabling communications management information to be conveyed by the choice of code. Measurements of signal and noise are made at the receiver for each transmitted frequency to assist establishing a HF communications link. Synchronous detection of the received signal is used, employing correlators (103, 104) in phase quadrature.
摘要翻译：用于HF通信系统的频率管理的电离层探测系统在发射机和远程接收机之间运行，并且利用在整个HF频带的频率上传输的码调制窄带探测脉冲。代码具有脉冲自相关函数，频率选择是伪随机的。代码可能是两部分的补码。或者，代码可以是具有高自相关性和低互相关特性的一系列代码中的选定的一个，从而使得能够通过代码的选择来传达通信管理信息。在接收机处针对每个发射频率进行信号和噪声的测量以辅助建立HF通信链路。使用相位正交的相关器（103,104）来接收信号的同步检测。

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