Perrins, Erik (International Foundation for Telemetering, 2002-10)
A noncoherent receiver for the general case of M-ary partial response multi-h continuous phase modulation (CPM) is presented. The receiver operates on the principle of sequence estimation via the Viterbi Algorithm (VA). It offers a significant complexity reduction from the optimal coherent maximum likelihood sequence estimating (MLSE) receiver. The performance of the receiver is evaluated with computer simulations. It performs at a loss of 1–6 dB relative to the MLSE receiver for the CPM schemes considered in the simulations. The receiver shows promise in applications requiring reduced complexity and use of existing hardware.
Rice, Michael (International Foundation for Telemetering, 2012-10)
The differences between S-band and C-band systems are summarized in the context of missile telemetry. The most important challenges of C-band operation are identified: for air-to-air and airto- surface systems, the relative small size of these missiles limits their ability to source additional DC power and handle increased heat loading due to potentially less-efficient C-band telemetry transmitters. For surface-to-air systems, the prospect of reduced link margin and potential tracking problems associated with narrower beamwidth antennas are the dominant issues for interceptor type systems whereas the power and heat issues associated with less-than-unity telemetry transmitters are the dominant issues for anti-air warfare systems. The potential problems for C-band telemetry of surface-to-surface systems appear to be more like the fixed-wing aircraft issues, many of which have been resolved.
Rice, Michael; Jensen, Michael (International Foundation for Telemetering, 2011-10)
This paper summarizes L- and C-band propagation data based on multiple transmit and receive antennas in the flight-line environment at Edwards AFB. The data show that for this particular environment, C-band propagation exhibits much less delay spread than L-band propagation. But C-band propagation is more susceptible to complete outages due to shadowing. The main contributing factors to these conclusions are the increased attenuation at the point of reflection at C-band and the fact that the same antennas were used for both the L- and C-band experiments. Consequently, the receive antenna beamwidths were different (the beamwidth was much narrower at C-band) and this narrowed the angular spread of the multipath components captured at C-band.
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