Accession Number : ADA293690

Title :   GPS-Squitter Interference Analysis.

Descriptive Note : Project rept.,

Corporate Author : MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB

Personal Author(s) : Orlando, Vincent A. ; Harman, William H., III

PDF Url : ADA293690

Report Date : 06 APR 1995

Pagination or Media Count : 42

Abstract : GPS-Squitter is a system concept that merges the capabilities of Automatic Dependent Surveillance (ADS) and the Mode S beacon radar. The result is an integrated concept for seamless surveillance and data link that permits equipped aircraft to participate in ADS and/or beacon ground environments, offering many possibilities for transition from a beacon to an ADS-based environment. Since GPS-Squitter and its associated data link share the 1030/1090-MHz beacon frequencies with other users (e.g., ground beacon radars and TCAS), there is some level of interaction between the operation of these various systems. One form of interaction is the effect on GPS-Squitter operation caused by the activities of other users. This effect, plus the effect of self-interference of GPS-Squitter Operation, determines the operational capacity of GPS-Squitter. The complementary process is the effect of the GPS-Squitter operation on the other users of the beacon frequencies. This report provides an analysis of the interference to other users of the 1030/1090-Mllz beacon frequencies caused by GPS-Squitter operation. The principal interference effect is channel occupancy on the beacon frequencies that prevents the reception of a desired signal by a receiver. The basis for the analysis is to estimate the channel occupancy on the beacon frequencies and its effect on the operation of victim receivers on those frequencies. The analysis is performed separately for the two frequencies. The analysis of 1030-MHz interference estimates the effect of the 1030-MHz data link activity that may be associated with GPS-Squitter (such as differential correction broadcast and two-away data link) on the operation of a transponder receiver.

Descriptors :   *SURVEILLANCE, *RADAR BEACONS, FREQUENCY, INTEGRATED SYSTEMS, DETECTORS, INTERACTIONS, RADIO BROADCASTING, AIR TRAFFIC CONTROL SYSTEMS, GLOBAL POSITIONING SYSTEM, OPERATION, DIFFERENTIAL EQUATIONS, RADAR RECEIVERS, CASUALTIES, DATA LINKS, AUTOMATIC, CHANNELS, CORRECTIONS, TRANSPONDERS, RADAR INTERFERENCE.

Subject Categories : Active & Passive Radar Detection & Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE