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JAVAD Circulates Petition to End P-Code Encryption, Strengthen GPS Signals

The GNSS equipment manufacturer believes the move could provide a resolution for the LightSquared/GPS conflict.

JAVAD is circulating an online petition to end P-code encryption as a way to strengthen the GPS signal and prevent interference from broadband networks such as the network being developed by LightSquared. The petition states:

“High precision GNSS receivers are more sensitive to interference because GPS digital signals are used for "ranging.” A 30-year-old U.S. policy of encrypting P-codes has made GPS 1,000 times more vulnerable to interference, especially for high-precision applications. Encrypting should be done only where and when needed.”

The petition notes that “high-precision applications of GPS are major contributors to our national success and growth” and urges President Obama to end P-code encryption as quickly as possible. JAVAD has also developed a video that outlines the problem and the proposed solution.

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P-Code decryption

Reg Parks
August 7, 2011
1.) The P-code is a military signal. Do we really know what is contained in the encrypted message and how critical that is to military operations? 2.) Is there some vested interest that a GPS manufacturer would have in making such a request? 3.) Could there be some motivation beyond an internal proprietary vested interest such as making it easy for LightSpeed to move forward and perhaps decrease the effectiveness of GPS access and accuracy in the future? Javad Ashjaee is an expert in GPS hardware, software and communications and so the idea has potential validity but what do the GPS signal scientists at Schriever AFB have to say about the suggestion?

P-Code Encryption

Javad Ashjaee
August 15, 2011
1. In my opinion encrypting P-code does not bring any benefit to military. GLONASS is not encrypted and is much easier to track and is much less sensitive to all interferences. LightSquared is only one of the interferences. 2. My vested interest is to make GPS signals stronger and more useful for high precision applications. Also my interest is to make a combined GPS/LSQ receiver to use LSQ channels for RTK correction transmissions and make RTK more robust and less expensive. 3. If LightSquared hurt GPS, my company will get affected first. I have absolutely no ties and no personal interest in LSQ.

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