Simultaneous dual-band radar development

Efforts to design and construct an airborne imaging radar operating simultaneously at L band and X band with an all-inertial navigation system in order to form a dual-band radar system are described. The areas of development include duplex transmitters, receivers, and recorders, a control module, motion compensation for both bands, and adaptation of a commercial inertial navigation system. Installation of the system in the aircraft and flight tests are described. Circuit diagrams, performance figures, and some radar images are presented

SP mountain data analysis

An analysis of synthetic aperture radar data of SP Mountain was undertaken to demonstrate the use of digital image processing techniques to aid in geologic interpretation of SAR data. These data were collected with the ERIM X- and L-band airborne SAR using like- and cross-polarizations. The resulting signal films were used to produce computer compatible tapes, from which four-channel imagery was generated. Slant range-to-ground range and range-azimuth-scale corrections were made in order to facilitate image registration; intensity corrections were also made. Manual interpretation of the imagery showed that L-band represented the geology of the area better than X-band. Several differences between the various images were also noted. Further digital analysis of the corrected data was done for enhancement purposes. This analysis included application of an MSS differencing routine and development of a routine for removal of relief displacement. It was found that accurate registration of the SAR channels is critical to the effectiveness of the differencing routine. Use of the relief displacement algorithm on the SP Mountain data demonstrated the feasibility of the technique

The application of airborne imaging radars (L and X-band) to earth resources problems

For abstract, see N75-24064

Multi-frequency fine resolution imaging radar instrumentation and data acquisition

Development of a dual polarized L-band radar imaging system to be used in conjunction with the present dual polarized X-band radar is described. The technique used called for heterodyning the transmitted frequency from X-band to L-band and again heterodyning the received L-band signals back to X-band for amplification, detection, and recording

Controlled, dose-response study of sertindole and haloperidol in the treatment of schizophrenia

Objective: This multicenter, double-blind, placebo-controlled study evaluated the efficacy and safety of three doses of sertindole (12, 20, and 24 mg/day) and haloperidol (4, 8, and 16 mg/day) in the treatment of psychotic symptoms for 497 hospitalized patients with schizophrenia. Method: The patients were randomly assigned to one of the medication groups and received treatment for 8 weeks. Changes in Positive and Negative Syndrome Scale, Scale for the Assessment of Negative Symptoms, Brief Psychiatric Rating Scale, and Clinical Global Impression scores were used as evaluations of treatment efficacy. Three rating scales were used to assess extrapyramidal symptoms as well as the occurrence of adverse events and the use of medications related to extrapyramidal symptoms. Results: Both sertindole and haloperidol were comparably effective in the treatment of psychosis, and all dose levels were significantly more effective than placebo. For the treatment of negative symptoms, only sertindole, 20 mg/day, was significantly more effective than placebo. For all extrapyramidal symptom measures, sertindole was clinically and statistically indistinguishable from placebo, and rates of extrapyramidal symptoms were not dose related. All dose levels of haloperidol produced significantly more extrapyramidal symptoms than placebo or sertindole. Adverse events associated with sertindole treatment were mild in severity. Conclusions: Sertindole is a new antipsychotic agent effective for the treatment of both the Positive and negative symptoms of schizophrenia, with motor side effects that are indistinguishable from those associated with placebo