Target tracking and location based on azimuth measurement only is a kind of method to estimate the position, velocity and other motion states of the motion target, which works by using the noisy azimuth information of electromagnetic wave or acoustic signal passively received by the sensor. Because of the outstanding advantages of simple principle and good concealment, it is widely used in photoelectric reconnaissance and countermeasure. In order to realize the tracking and location of moving targets by ground observation stations, the target motion model is established based on the plane rectangular coordinate system, and the target state is estimated by the least square method. Several main factors determining the accuracy of target tracking and location are analyzed, and the mean and standard deviation of location error are simulated and analyzed by Monte Carlo method. The effects of the number of observation stations, target distance and angle measurement accuracy on the location error and its distribution law are revealed. The simulation results can be used to evaluate the location effectiveness of moving targets, effectively improve the location accuracy of targets and optimize the parameter configuration of observation stations.
Considering the demand of performance test of infrared spectral imaging equipment, as the key indicator, the 3-D noise model of noise equivalent temperature difference is analyzed. The seven components and their meanings are presented. A test algorithm based on standard deviation of NETD is put forward. The paper shows the composing and principle of the detection system, and introduces the computational procedure and detection process of NETD. The test algorithm is verified by experiments. According to the comparison with the imported equipment, the test results have good duplication and high precision. The test system has been applied to the performance test for several kinds of infrared spectral imaging equipment, which meets the demand of engineering support.
In allusion to the demand of infrared system test, the principle of Infrared target simulator and the function of the temperature control are presented. The key technology of High precision temperature control is discussed, which include temperature gathering, PID control and power drive. The design scheme of temperature gathering is put forward. In order to reduce the measure error, discontinuously current and four-wire connection for the platinum thermal resistance are adopted. A 24-bits AD chip is used to improve the acquisition precision. Fuzzy PID controller is designed because of the large time constant and continuous disturbance of the environment temperature, which result in little overshoot, rapid response, high steady-state accuracy. Double power operational amplifiers are used to drive the TEC. Experiments show that the key performances such as temperature control precision and response speed meet the requirements.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.