New Pseudo Random Noise Code Family to enhance radio-navigation based systems

Ref-Nr: TDO0040

New Pseudo Random Noise Code Family to enhance radio-navigation based systems

Technology abstract

An International Organisation is offering a technology for navigation systems that use pseudo-random noise (PRN) sequences as spreading codes. Originally developed for satellite navigation system, the proposed method may be used for handheld devices for position determination, in-car navigation support, and electronic systems, allowing higher costs savings, and much less memory to store Pseudo-Random Noise PRN codes.

Technology Description

An International Organisation is offering a technology for navigation systems that use pseudo-random noise (PRN) sequences as spreading codes. This technology was originally developed for satellite navigation system and/or a ground-based pseudolite system. It includes a receiver for use in a navigation system comprising multiple transmitters. Each transmitter transmits a positioning signal comprising a pseudo-random noise (PRN) sequence corresponding to the respective transmitter. The receiver comprises a code module for supplying multiple PRN sequences corresponding to the respective multiple transmitters and a correlator to combine the PRN sequences supplied by the code module with an incoming signal.
The use of navigation system codes in aerospace systems have reached a mature level since 1996 but the growing applications in other sectors has started since 2009, especially in the electronic systems field.
A Theoretical analysis of the proposed technology has been activated but a practical prototype still needs to be developed.

Innovations & Advantages

The main advantages of the proposed technology are related to:

• Higher costs saving because of the possibility given to self-develop the PRN codes according to the requested needs
• It is easier than current PRN code generation approaches and has better performance and correlation
• Significantly less memory is required to store the PRN codes
• Larger code families
• It may be applied to various application areas: therapeutics, navigation systems, radars, transmission, telecom, etc

Further Information

Current PRN code generation approaches are either extremely complex or do not comply with the requirements set out the code length. The proposed method allows adjusting the length leading to degradation in performance. The proposed method provides a receiver to be used with a navigation system including multiple transmitters, where each transmitter emits a positioning signal comprising a pseudo-random noise (PRN) sequence corresponding to its respective transmitter. The receiver comprises a code module and a correlator.
The receiver may be provided as a stand- alone device or may be incorporated in other electronic equipment such as a mobile telephone, a camera, a vehicle navigation system. The transmitters are currently conceived to be located on satellites but maybe easily provided by ground-based elements. The following scheme summarises the overall methodology.

Current and Potential Domains of Application

Currently this technology is particularly well suited for satellite constellation navigation systems. The application however could be extended to any wireless system basing the signal transmission on Code
Division Multiple Access (CDMA) and terrestrial communication.
Specifically, others applications of the technology could be:
• Therapeutic applications in diagnosis, surgery and analysis of biological material
• Navigation and radio navigation applications: measuring distances and gyroscopic instruments
• Electric digital data processing: computers and optical systems
• Traffic control system and radars
• Transmission of digital information and telegraphic communication
Satellite-based navigation systems (or radio navigation satellite systems) are becoming increasingly important in a wide range of applications, including handheld devices for position determination, in-car navigation support, etc...