David Lynch Jr. - Tactical Persistent Surveillance Radar with Applications

Disclaimer: The following software appendices can be obtained online from the IET Digital Library at . The cost is USD 15.00 to cover mailing. The software appendices are for information only. There are counterpart Adobe Acrobat files of most of the programs with output for a user to read first.

The programs are written in M/S Excel 2000, M/S Quick Basic and Mathcad 11 and 15. If the user has any Mathcad host between 11 and 15, these application programs should run. Files ending in .prn are space-delimited raw data. Files ending in .bmp are amplitude-detected input or output images. The software worked on four different computers with both AMD and Intel CPUs in M/S Windows 7 and XP. But as anyone familiar with these host applications knows, they may not work on your machine and operating environment without some modifications. If the application listed has no file type extension, the extension is .mcd or .xmcd. There is no warranty! The following items of software are in Chapters 17 Appendices on the DVD-R or internet.

• 1. Cellphone13 This program calculates the search rate and location accuracy for single cellphone emitters from a LEO spacecraft with a large antenna.
• 2. Cellphone14d2 This program calculates the search rate and location accuracy of cellphone emitters from an aircraft. It applies a maximum likelihood estimate of location using a series of angle detections and position estimates.
• 3. cornoise2 This program calculates simulated experimental statistics for a correlation-type intercept receiver. The typical configuration multiplies the left and right channels of a monopulse antennareceiver system together. It follows this with a square law detector and integrator over the look time. For typical monopulse feed spacing, the two channels will be adequately close in TOA for any emitter in the mainbeam so that only a few dB will be lost in decorrelation for a broadband phase code. There will be recurrent ambiguous sidelobe peaks that will also correlate sidelobe interferers. X and Y are the input channels that are assumed Gaussian. The simulation assumes homodyne operation but the statistics are the same for IF processing. The experimental statistics are plotted along with other density functions to provide an intuition of the relative performance. Moments are calculated. Output mean and variance are estimated. The inputs and comparison statistics have variances of 1.
• 4. cornoise3 Similar to cornoise2 but with different parameters.
• 5. cornoise4 Similar to the above but with different parameters.
• 6. cornoise5 Similar to the above but with different parameters.
• 7. GMTIDwell This Excel spreadsheet calculates required dwell times for a hypothetical spacecraft for a series of orbital locations and look angles. Be sure to turn on macros.
• 8. GMTITotals This Excel spreadsheet summarizes and compares performance for a series of spacecraft configurations based on beginning of life on orbit mass. Be sure to turn on macros.
• 9. footprnt81 This Mathcad program calculates footprints and power at an intercept receiver using the more accurate model including antenna pattern, weather losses and flat earth range geometry.
• 10. ftprt3 This Mathcad program calculates cookie cutter footprints.
• 11. ftprt4 This Mathcad program calculates cookie cutter footprints.
• 12. HA6GMTISAR This Excel spreadsheet calculates GMTI and SAR performance for a hypothetical 6 ton spacecraft used in the overall evaluation provided in GMTITotals above. Be sure to turn on macros.
• 13. Monopulsel This program calculates a simple 1D monopulse antenna pattern using parabolic weighting, which is easy to realize and has a linear difference pattern.
• 14. PassiveDF6a This Mathcad program calculates the idealized Gaussian patterns for broadband cavity backed spirals used for amplitude comparison passive direction finding (amplitude AOA). The channel match is assumed 1.25 dB. Quadrant beamwidths chosen to limit discriminant range to less than 20 dB.
• 15. PassiveDF7a This Mathcad program calculates the idealized Gaussian patterns for broadband cavity backed spirals used for amplitude comparison passive direction finding. The SNRs are held constant but noise voltage is assumed to be 10 times lower at the log detectors (it makes a large difference and is one of the problems with log detectors). The channel match is assumed 1.5 dB.
• 16. PassiveDF8 This Mathcad program calculates the total error for phase comparison passive direction finding (phase AOA) as a function of SNR as well as antenna and processing mismatch.
• 17. PassiveDF9 This Mathcad program calculates the total error for phase comparison passive direction finding (phase AOA) as a function of SNR as well as antenna and processing mismatch with somewhat different parameters than PassiveDF8.
• 18. PassiveDF15 This Mathcad program calculates the total error for range estimation using ground-based interceptors and phase comparison passive direction finding (phase AOA) as a function of various ranges and SNR as well as antenna and processing mismatch.
• 19. PassiveDFl6 This Mathcad program calculates the total error for range estimation using ground-based interceptors and phase comparison passive direction finding (phase AOA) as a function of a different set of ranges and SNR as well as antenna and processing mismatch.
• 20. PassiveDFl7 This Mathcad program calculates the total error for range estimation using ground-based interceptors and phase comparison passive direction finding (phase AOA) as a function of a different set of ranges and SNR as well as antenna and processing mismatch.
• 21. Radiometer2 This Mathcad program calculates the SNR for an intercept receiver operating in a radiometer mode. The signal is assumed to integrate according to Swerling 1 and grows approximately to the 1.5 power since the input SNR begins at less than 1. (See pages 81 and 82 in Nathanson, Radar Design Principles, 1st ed., 1969.) It assumes that there is no interference.
• 22. rdrcls52 This is a very simple program to calculate the number of emitters visible to an observer in masking terrain as a function of altitude and ground range to the horizon.
• 23. Tempapprox1 This Mathcad program is a temperature approximation for use with radiometer interceptors.

Please see the disclaimer in the beginning of the Appendices. All of this software is offered to help understanding. Every effort has been made to improve usability and operation. But there is no warranty!

• 24. AESAWeighting002 This program calculates an ideal AESA beam pattern in azimuth and elevation using raised cosine (cosine squared) amplitude weighting with MN elements.
• 25. FIRFiltersl This program calculates a finite impulse filter with a cascade of two filters. One to suppress far sidelobes and other to form the central band lowpass filter.
• 26. FIRFilters2 This program calculates two bandpass FIR filters: one for negative frequencies and the other for positive frequencies.
• 27. FIRFilters3 This program calculates two FIR filters that might be used in a synthetic monopulse.
• 28. FIRFilters3c This program calculates two FIR filters with a linear difference pattern.
• 29. GMTIPower006d This program calculates the required transmit power for a given set of parameters. The power profiles with range for target, clutter, noise and jammer are calculated.
• 30. ISLR2a This program calculates the ISLR for unweighted, triangular weighted and Parzen weighted FFT filters. This is primarily oriented toward chirp stretch processing. C is the multiplier of the 3 dB down point to be used in the ISLR calculation. Nrb is the number of equivalent range bins, TE is the effective pulse width and fIF is the input bandwidth to the A/D.