公开(公告)号：US11041961B1

公开(公告)日：2021-06-22

申请号：US16899011

申请日：2020-06-11

Applicant: Northrop Grumman Systems Corporation

Inventor： Dennis M. Hall ,  Kiet D. Ngo ,  Marlon E. Marquez

IPC: G01S19/36

Abstract: A frequency hopping Global Positioning System (GPS) system comprises an on-orbit reprogrammable digital waveform generator configured to generate a GPS signal comprising a resilient frequency-hopping spread spectrum GPS signal that hops at a hop rate between two or more GPS channels. The GPS signal further comprises a legacy direct-sequence spread spectrum signal for at least two of the two or more GPS channels. Further, a receiver is configured to receive the GPS signal, wherein the receiver is further configured to decode the GPS signal.

公开(公告)号：US20250023849A1

公开(公告)日：2025-01-16

申请号：US18220452

申请日：2023-07-11

Applicant: Northrop Grumman Systems Corporation

Inventor： Marlon E. Marquez ,  Darren R. Gregoire ,  Prakash Sarathy

IPC: H04L9/40 ,  H04L12/22

Abstract: A dual-mode communication device adapted for communication over a public network, wherein the dual-mode communication device is adapted to be operated in a normal mode and in an obfuscated mode. The dual-mode communication device includes a processor and a network interface device. The processor develops a frame from a payload received by the dual-communication device and, if the dual-mode communication device is operating in the obfuscated mode, an obfuscated frame from the frame. The frame and the obfuscated frame comprise a preamble that conforms with protocols associated with the public network and the processor. A network interface transmits one of the frame or the obfuscated frame using the public network. The payload may be extracted from the frame by any receiving device operating in the normal mode in the public network and the payload may be extracted from the obfuscated frame only by another communication device also operating in the obfuscated mode in the public network.

公开(公告)号：US10732294B1

公开(公告)日：2020-08-04

申请号：US15368928

申请日：2016-12-05

Applicant: Northrop Grumman Systems Corporation

Inventor： Dennis M. Hall ,  Kiet D. Ngo ,  Marlon E. Marquez

IPC: G01S19/36

Abstract: A system for generating a frequency hopping Global Positioning System (GPS) system includes: an on-orbit reprogrammable digital waveform generator (ORDWG) configured to generate a GPS signal comprising a resilient frequency-hopping spread spectrum GPS signal that hops at a hop rate between two or more GPS channels, the GPS signal further comprising a legacy direct-sequence spread spectrum signal for at least two of the two or more GPS channels; and a receiver configured to receive the GPS signal, the radio further configured to decode the GPS signal.

公开(公告)号：US09503294B1

公开(公告)日：2016-11-22

申请号：US15182452

申请日：2016-06-14

Applicant: NORTHROP GRUMMAN SYSTEMS CORPORATION

Inventor： Marlon E. Marquez ,  Douglas S. Cockfield ,  Gerald R. Fischer ,  Matthew M. D'Amore

IPC: H04B1/04 ,  H04L27/36 ,  H04L27/24 ,  H04L27/00 ,  H04L27/34 ,  H04B1/717

CPC classification number: H04L27/0008 ,  H03F1/02 ,  H03F3/24 ,  H04B1/0475 ,  H04B1/7172 ,  H04B2001/045 ,  H04L27/3405 ,  H04L27/368

Abstract: An amplitude and phase modulation circuit for modulating an M-ary digital signal having pulses onto a carrier wave for transmission by direct digital synthesis. The modulation circuit includes a digital source that generates a digital signal including pulses representing logical 1s and no pulses representing logical zeros, where a group of M pulses represents a constellation point to be transmitted. The modulation circuit further includes a phase control circuit that provides phase control and an amplitude control circuit that provides pulse width control for the constellation point to be transmitted. A saturated amplifier amplifies the phase and amplitude controlled digital signal and a filter integrates and averages the digital signal to remove noise from the signal so as to convert the digital signal to an analog signal, where the digital source operates to reduce the amplifier power consumption requirements.

Abstract translation: 一种幅度和相位调制电路，用于通过直接数字合成将具有脉冲的M数字信号调制到载波上以进行传输。 调制电路包括产生数字信号的数字源，该数字信号包括表示逻辑1的脉冲，无脉冲表示逻辑零，其中一组M个脉冲表示要发射的星座点。 调制电路还包括提供相位控制的相位控制电路和为要发送的星座点提供脉冲宽度控制的幅度控制电路。 饱和放大器放大相位和幅度受控的数字信号，并且滤波器对数字信号进行积分和平均以去除信号中的噪声，以将数字信号转换为模拟信号，其中数字源工作以降低放大器功耗要求 。