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Receiver of a radar moving target simple stability test method

Crossing with the display device to observe the waveform will be spread to. So, can spread out to characterize the degree of instantaneous frequency stability. Small changes in oscillation frequency,[link widoczny dla zalogowanych], due to the accumulation phase effect, the longer the time to ask the more obvious changes, the greater the spread waveform. As the frequency of the crystal stability standard signal is high,[link widoczny dla zalogowanych], therefore,[link widoczny dla zalogowanych], beat sine wave jitter (spread out), can be considered as coherent oscillator instability 【played, and in order to participate in the quantitative phase oscillator instantaneous frequency stability, the smaller the spread waveform that the instantaneous frequency stability better. Spread by the waveform can estimate the degree of stability of the instantaneous frequency Af / f, is calculated as follows: First, where: △ ,[link widoczny dla zalogowanych],/,-- instantaneous frequency stability; a wave spread out degrees, rad; - delay time s; Factory mouth one by one oscillator center frequency, Hz. For a certain type of radar 5. (O.0873tad), f a 1000F ~ s, fo a 30MHz, then the instantaneous coherent oscillator frequency stability is: = hundred two 6 × 10100010010.6.28 × × a × 3 × 'needs more than the standard measurement method crystal oscillator signal source, for laboratories and specialized manufacturers. Second, the whole moving target receiver to measure the stability of the tube and easy method for the general use of force, there is no specific standard signal source, use laboratory methods to measure the instantaneous moving target receiver frequency stability have considerable difficult. According to some of our technical state of a certain type of Lei Date and years of practical experience, Electronic Engineering 1994 2 to 5 worked out in the machine on a radar machine using existing equipment, measuring coherent moving target receiver instantaneous oscillator frequency stability approach. The basic starting point is to use a certain type of radar, high-end and low end of the oscillator operating point of the vibration frequency of the corresponding difference of 30MHz, and two high stability of the oscillator is a crystal oscillator, so that you can the difference between the two LO As a 30MHz frequency standard signal source, the use of phase coherent detection method to measure the instantaneous oscillator frequency stability. The block diagram and method of measurement are as follows: (L-5 ~ I Road moving target receiver measurements for example) in the amount of input j mandarin duck phase stability measurement block diagram in Figure 1 Measurement Methods: Measurement block diagram of the Lotus car was then the signal cable to send and receive options coherent way home I switch files; scan range switch setting. Rough \3 shows the shape, calculated as follows (continued on page 8) 6 Figure 2 Figure 3 Waveform of crude refined baseline baseline waveform Electronic Engineering 19 <) 4, No. 2 device, charging circuit to play in the low pressure discharge fire problem. 4, the detection power of the slight decline 7 (Note: in line with dropped 15 to allow derating requirements) 5, AFC sealed inflated due to the need for frequency hopping, require manual intervention preset in advance. Third, the use of the radar in 1992, lO l0 January to May 1993 delivery. Special conditions at an altitude of 5374m, the boot 190 {] h (about 4-5 hours per day, the longest continuous ll hours), 1600 batch of discovery and treatment goals, the role of civil aircraft from the × × × km, height lO000m minicomputer found from × × × a × × × km, to better ensure the completion of the task on duty, many times by the leading organs of the recognition. In 1993, the radar guided Trek solid × × × country flight meritorious awards by the Central Military Commission Chairman of the orders. January 20, 1993, lO of the aircraft jointly Japanese plant were identified, and use after use after a year of proof of the person A modified type of mine after election, the plateau in a particular geographical environment, you can assume the task to monitor the boot , its performance into full play and transform the most stable and reliable. (Continued from page 6) == 1 × 360. , Where: wave spread out one by one degree; L one by one beat sine wave - the baseline cycle length (ram) {△ l one by one wave spread from the (ram); I - baseline width (ram); Note : measured by the machine, many factors affect the stability of particular local oscillator, power supply, A scan showed the stability of the circuit have a greater impact on the measured data. Therefore, the measurement should be used when the natural frequency stability of a corresponding point of the best, AC voltage regulator can be adjusted so that the relevant circuit in the most stable region. An electronic engineering in 1994 from 8 to 2
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