Gps M Code

The highly encrypted M-Code to protect GPS signals from jamming and spoofing

currently is enabled on 22 GPS satellites of various generations; 24 are needed to bring the M-Code to full operational...

In a major departure from previous GPS designs, the M-code is intended to be

broadcast from a high-gain directional antenna, in addition to a wide angle (full Earth) antenna. The directional antenna's signal, termed a spot beam , is intended to be aimed at a specific region (i.e., several hundred kilometers in diameter) and increase the local signal strength by 20 dB (10× voltage field strength, 100× power).

This month, GPS World featured M-Code extensively, including a Q&A with two

of the three authorized providers of M-Code receivers: Collins Aerospace and L3, during which the two companies offer deep dives into the technical process for developing the new M-Code receivers, which includes Modernized GPS User Equipment (MGUE) like Collins Aerospace’s MPE-M device, their timelines for deployment, and what platforms the devices will be integrated into.

The M-code was designed to share the same bands with existing signals, on bo

th L1 and L2, and still be separate from them. See those two peaks in the M-code in the illustration. They represent a split-spectrum signal about the carrier.

M-code is a new military signal used in the L1 (1575.42 MHz) and L2 (1227.60

MHz) GPS bands. It is designed to improve security and anti-jamming properties of military navigation using GPS. M-Code offers several operational benefits:

In a major departure from previous GPS designs, the M-code is intended to be

broadcast from a high-gain directional antenna, in addition to a full-Earth antenna. This directional antenna's signal, called a spot beam, is intended to be aimed at a specific region (several hundred kilometers in diameter) and increase the local signal strength by 20 dB, or approximately 100 times stronger.

Over the past year, the GPS Military Signal Design Team (GMSDT), led by the

GPS Joint Program Office (JPO), has produced a recommended design of the new military signal for the L1 and L2 bands. This paper synopsizes the resulting M code signal design, which is to be implemented in modernized satellites and in a new generation of receivers.

General Dynamics’ Sentinel M-Code GPS Receiver provides Precise Positionin

g Service position, velocity, and time information for Low Earth Orbit (LEO) and Geostationary Earth Orbit (GEO) applications. MEO and HEO orbits are also available.

GPS is transmitting in the L2 band (1227.60 MHz) a modernized civil signal k

nown as L2C together with the P (Y) Code and the M-Code. The P (Y) Code and M-Code were already described shortly in the previous chapter and the properties and parameters are thus similar to those in the L1 band.

Title 10 of the U.S. Code, Section 2281, assigns the Secretary of Defense st

atutory authority to sustain and operate GPS for military and civil purposes. The statute directs the Secretary of Defense to provide civil GPS service on a continuous, worldwide basis, free of direct user fees.

The MPE-M is capable of receiving the current military Y-Code GPS signal alo

ng with the newer Military Code (M-Code) signal. For all GPS signals, the MPE-M provides warfighters improved security, assured positioning and it satisfies the U.S. government’s requirement for all military GPS equipment to be M-Code capable.

High Sensitivity M-code GPS Receiver Technology Development for Dismounted S

oldier Applications The objective of this technology is to demonstrate innovative signal processing enhancements to improve M-Code receiver performance for dismounted Soldiers operating in GPS degraded environments.

The M-code is expected to improve security and anti-jamming capabilities for

GPS-reliant military systems, which number in the hundreds and run the gamut from fighter jets to warships to...

M-code signals are available on all the on-orbit GPS IIR-M, IIF and III spac

e vehicles. A key to enabling M-code is a new software-defined receiver Lockheed Martin developed and is installing at all six Space Force monitoring sites.

In the case of M-code, the signal is a BOCsin (10,5) modulation, which has a

power spectral density given by: This power spectral density can be seen in the figures below, along with legacy C/A and P (Y) codes (and also the new L2C signal on L2).

During Phase I and Phase II, the developer may use the version of M-Code kno

wn as M-Prime, and documented in IS-GPS-700. Information assurance and anti-tamper considerations should be incorporated in Phase II to enable full capability development in Phase III.

Today about 60 percent of the current GPS constellation is made up of Lockhe

ed Martin-designed and built GPS IIR satellites, which began launching in 1997, and the first M-Code capable GPS satellites, the GPS IIR-M, which began launching in 2005.

Over the past year, the GPS Military Signal Design Team GMSDT, led by the GP

S Joint Program Office JPO, has produced a recommended design of the new military signal for the L1 and L2 bands. This paper synopsizes the resulting M code signal design, which is to be implemented in modernized satellites and in a new generation of receivers.

The Modernized User Equipment (MUE) program has produced prototype standard-

sized military GPS receivers with M-Code and legacy C/A and P(Y) codes. The MGUE program, meanwhile, is developing ...

The Path To M-Code. ... REPEATER NOTICE: Due to current regulatory considera

tions, GPS Repeater kits are only available for sale to: International Customers (outside the U.S.), agencies of the US Federal Government, parties operating under the direction of the US Federal Government, or parties that have received an STA or Experimental License ...

Commercial GPS receiver manufacturers are not authorized to use the P(Y) cod

e directly. Therefore, most have developed proprietary techniques both for carrier wave and pseudorange measurements on L2 indirectly. There is now a civilian code on L2 (L2C). There is also now a military code known as the M code. We will discuss both of these later.

The C/A code is the basis for civilian GPS use. The second pseudo-random cod

e is called the P (Precise) code. It repeats on a seven day cycle and modulates both the L1 and L2 carriers at a 10MHz rate. This code is intended for military users and can be encrypted. When it's encrypted it's called "Y" code.

The SyncServer S650 M-Code equipped time and frequency instrument is a rack

mounted server device that synchronizes to the atomic clocks aboard GPS satellites via M-Code. The S650 M-Code leverages new technology to provide enhanced anti-jamming protection and further hardening against spoofing, providing greater accuracy, and improving operator ...

27 Aug. 2020 --While the new anti-spoofing, anti-jamming, encrypted M-code s

ignal has been available on many GPS satellites for years, the military has not had the corresponding ground and user ...

The U.S. Space Force has completed military-code (M-code) early use hardware

and software updates to the government's GPS Operational Control System. M-Code is designed to optimize warfighters ...

The SyncServer S650 M-Code is a rack-mounted server device that synchronizes

to the atomic clocks aboard GPS satellites via M-Code. The S650 M-Code leverages new technology to provide enhanced anti-jamming protection and further hardening against spoofing, providing greater accuracy, and improving operator ease-of-use for key loading.

M-Code, similarly, is a new encrypted GPS signal developed as part of the GP

S modernisation programme that’s been ongoing since 2000. M-Code is restricted for authorised military use, and provides advanced protection against jamming and spoofing, as well as improved signal availability through the use of directional antennas.

M-Code-encrypted GPS signals help make GPS systems more secure for U.S. Arme

d Forces and allies. M-Code signals are available on all GPS IIR-M, IIF and III space vehicles and are monitored at Space Force sites with the aid of a software-defined-radio (SDR) receiver developed by Lockheed Martin.

"M-code receivers unlock the next-generation GPS network for military users,

" said Rick Yuse, president of Raytheon Space and Airborne Systems. "This test demonstrated M-code capability onboard the B-2 for the first time, marking an early milestone for the overall GPS modernization effort."

GPS Source has announced the Enhanced D3 as an upgradeable D3 (DAGR Distribu

ted Device) capable of distributing SAASM or M-Code protected GPS data. The Enhanced D3 is the most cost effective and comprehensive solution supporting Department of Defense GPS modernization efforts.

New SyncServer S650 M-Code secures military communication systems, radar and

networks reliant on GPS signals. Threats from intentional jamming and spoofing of U.S. Global Positioning System (GPS) signals, as well as cybersecurity risks to critical infrastructure, demonstrate the need for powerful and secure time and frequency systems that ensure continuing operability and performance.

A: The GPS M-code signal design began in 1997 and was concluded in 2001. The

M-code signal was first broadcast from the GPS Block IIR-14(M) satellite that was launched on September 25, 2005. All future GPS satellites will transmit M-code as well as the P(Y)-code signal, which is being retained for use by currently fielded military receivers.

Next we compare the BOC signal in sine and cosine phasing for different chip

rates. For exemplification we will take a sub-carrier rate of 10.23 MHz and a code rate of 5.115 MHz. We recall that these modulations correspond to the GPS M-Code and the Galileo PRS (E6).

NEW YORK--(BUSINESS WIRE)--Oct. 5, 2016-- L-3 Communications (NYSE:LLL) anno

unced today that its next-generation Military Code (M-Code) GPS User Equipment has successfully completed the final step in a government security certification process. L-3’s M-Code GPS features the most advanced user equipment technology available, which increases soldiers’ ability to resist enemy

The SyncServer S650 M-Code equipped time and frequency instrument is a rack

mounted server device that synchronizes to the atomic clocks aboard GPS satellites via M-Code.

The SyncServer S650 M-Code equipped time and frequency instrument is a rack

mounted server device that synchronizes to the atomic clocks aboard GPS satellites via M-Code. The S650 M-Code leverages new technology to provide enhanced anti-jamming protection and further hardening against spoofing, providing greater accuracy, and improving operator ...

M-Code signals are currently available on all the on-orbit GPS IIR-M, IIF an

d III space vehicles. A key to enabling M-Code is a new software-defined receiver Lockheed Martin developed and is installing at all six Space Force monitoring sites.

Under MGUE, ground-based M-Code compatible equipment is in development by L-

3 Communications, Raytheon and Rockwell Collins. This equipment – user terminals and circuit card technology - will use advanced microelectronics to make the new GPS system and M-Code useable by avionics, weapons and integrated sensors systems in the land, air and ...

Still, with one GPS III satellite on orbit and another scheduled for launch

soon, the Air Force wants the current ground system to be able to use M-code, at least in a limited fashion. The Air Force awarded Lockheed Martin a contract in 2016 for contingency operations to update the current ground system, allowing access to some of the GPS III ...

The modernization of GPS satellites to broadcast M-code, or the new standard

military code GPS signal, to combat jamming efforts requires updated receivers, ironically providing Northrop an ...

Collins Aerospace has received the Global Positioning Systems Directorate (G

PS-D) security certification from the U.S. Air Force Space and Missile Systems Center (USAF SMC) for its Military Code (M-Code) Common GPS Module (CGM). Security certification validates compliance to the stringent Military GPS User Equipment (MGUE) hardware and software security design specification.

The GPS M-Code referenced S650 is designed for high security, modern militar

y electronics, and networks that require best-in-class synchronization performance easily adaptable to a wide range of applications. Unparalleled Flexibility The modular Microchip S650 M-Code combines .